/* roulang page: index */
/* ========== 设计变量 ========== */
:root {
  --primary: #1a3a5c;
  --primary-light: #2d5f7e;
  --primary-bright: #3a8fbf;
  --accent: #e88d3c;
  --accent-light: #f7b267;
  --dark-bg: #0d1f2d;
  --light-bg: #f4f7fa;
  --white: #ffffff;
  --text: #243447;
  --text-muted: #6e7f8e;
  --border: #e2e9f0;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --shadow-sm: 0 2px 12px rgba(26, 58, 92, 0.06);
  --shadow-md: 0 8px 30px rgba(26, 58, 92, 0.08);
  --shadow-lg: 0 16px 48px rgba(26, 58, 92, 0.12);
  --spacing-section: 80px;
  --spacing-card: 24px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 22px;
  --font-size-title: 34px;
  --font-size-hero: 48px;
}

/* ========== 基础 Reset ========== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--text);
  background-color: var(--light-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.25s ease;
}

a:hover {
  color: var(--primary-bright);
}

ul,
ol {
  list-style: none;
  padding: 0;
}

button,
input,
textarea {
  font-family: inherit;
  border: none;
  outline: none;
}

.btn:focus,
.btn:focus-visible,
.form-control:focus,
.form-control:focus-visible {
  outline: 3px solid rgba(58, 143, 191, 0.25);
  box-shadow: none;
  border-color: var(--primary-bright);
}

.container-custom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (max-width: 768px) {
  :root {
    --font-size-title: 28px;
    --font-size-hero: 32px;
    --spacing-section: 56px;
  }
  .container-custom {
    padding: 0 18px;
  }
}

/* ========== 顶部导航 ========== */
.main-header {
  position: sticky;
  top: 0;
  z-index: 1050;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.04);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.03);
}

.main-header .navbar {
  padding: 0;
}

.main-header .navbar-brand {
  display: flex;
  align-items: center;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--primary);
  padding: 18px 0;
  letter-spacing: -0.02em;
}

.main-header .navbar-brand .brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary), var(--primary-bright));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 16px;
  margin-right: 10px;
  box-shadow: 0 4px 12px rgba(26, 58, 92, 0.25);
}

.main-header .navbar-nav .nav-link {
  color: var(--text);
  font-weight: 500;
  padding: 18px 18px !important;
  font-size: 0.95rem;
  position: relative;
  transition: color 0.25s;
}

.main-header .navbar-nav .nav-link::after {
  content: '';
  position: absolute;
  bottom: 12px;
  left: 18px;
  right: 18px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.main-header .navbar-nav .nav-link:hover {
  color: var(--primary);
}

.main-header .navbar-nav .nav-link:hover::after {
  transform: scaleX(1);
}

.main-header .navbar-nav .nav-link.active {
  color: var(--primary);
  font-weight: 600;
}

.main-header .navbar-nav .nav-link.active::after {
  transform: scaleX(1);
}

.header-btn {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff !important;
  padding: 10px 24px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.92rem;
  transition: all 0.3s ease;
  box-shadow: 0 4px 16px rgba(26, 58, 92, 0.2);
}

.header-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 58, 92, 0.3);
  color: #fff !important;
}

/* 移动端底部导航 */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1050;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  border-top: 1px solid rgba(0, 0, 0, 0.05);
  padding: 6px 0 calc(6px + env(safe-area-inset-bottom));
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.04);
}

.mobile-bottom-nav .tab-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 8px 4px;
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 500;
  transition: color 0.2s;
}

.mobile-bottom-nav .tab-item i {
  font-size: 1.3rem;
  line-height: 1;
}

.mobile-bottom-nav .tab-item.active {
  color: var(--primary);
  font-weight: 700;
}

@media (max-width: 991px) {
  .main-header .desktop-nav {
    display: none;
  }
  .mobile-bottom-nav {
    display: flex;
  }
  body {
    padding-bottom: 64px;
  }
}

@media (min-width: 992px) {
  .mobile-bottom-nav {
    display: none !important;
  }
  .main-header .mobile-header-btn {
    display: none;
  }
}

/* ========== Hero ========== */
.hero-section {
  position: relative;
  background: linear-gradient(135deg, rgba(13, 31, 45, 0.92), rgba(26, 58, 92, 0.85)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
  color: #fff;
  padding: 120px 0 140px;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -60%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(58, 143, 191, 0.2), transparent 70%);
  pointer-events: none;
}

.hero-section .badge {
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  font-size: 0.8rem;
  padding: 8px 18px;
  border-radius: 50px;
  letter-spacing: 0.05em;
  backdrop-filter: blur(6px);
}

.hero-title {
  font-size: var(--font-size-hero);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 20px 0 18px;
}

.hero-title .highlight {
  color: var(--accent-light);
}

.hero-subtitle {
  font-size: 1.15rem;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.8;
  max-width: 560px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

.btn-primary-custom {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--accent), #f7b267);
  color: #fff;
  font-weight: 700;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  transition: all 0.3s ease;
  box-shadow: 0 6px 24px rgba(232, 141, 60, 0.35);
  border: none;
}

.btn-primary-custom:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 32px rgba(232, 141, 60, 0.45);
  color: #fff;
}

.btn-outline-light-custom {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  color: #fff;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 50px;
  font-size: 1rem;
  border: 2px solid rgba(255, 255, 255, 0.4);
  transition: all 0.3s ease;
}

.btn-outline-light-custom:hover {
  border-color: #fff;
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 50px;
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-stats .stat-item {
  text-align: left;
}

.hero-stats .stat-number {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-light);
  line-height: 1.2;
}

.hero-stats .stat-label {
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.7);
}

@media (max-width: 768px) {
  .hero-section {
    padding: 80px 0 100px;
  }
  .hero-stats {
    flex-wrap: wrap;
    gap: 20px;
  }
  .hero-stats .stat-item {
    flex: 1 1 40%;
  }
}

/* ========== 板块标题 ========== */
.section-heading {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 48px;
}

.section-heading .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary-bright);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 8px 20px;
  background: rgba(58, 143, 191, 0.08);
  border-radius: 50px;
  margin-bottom: 16px;
}

.section-heading h2 {
  font-size: var(--font-size-title);
  font-weight: 800;
  color: var(--primary);
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.section-heading p {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.8;
}

/* ========== 核心能力 ========== */
.core-section {
  padding: var(--spacing-section) 0;
  background: var(--white);
}

.core-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  height: 100%;
  transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  position: relative;
  overflow: hidden;
}

.core-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-bright));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.core-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.core-card:hover::after {
  transform: scaleX(1);
}

.core-card .card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--primary-bright));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 22px;
  margin-bottom: 22px;
  box-shadow: 0 6px 20px rgba(26, 58, 92, 0.2);
}

.core-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
}

.core-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.75;
  margin-bottom: 0;
}

/* ========== 数据指标 ========== */
.stats-band {
  background: linear-gradient(135deg, var(--dark-bg), var(--primary));
  position: relative;
  padding: 70px 0;
  overflow: hidden;
}

.stats-band::before {
  content: '';
  position: absolute;
  inset: 0;
  background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  opacity: 0.12;
  mix-blend-mode: overlay;
}

.stats-band .container-custom {
  position: relative;
  z-index: 1;
}

.stats-band .stat-item {
  text-align: center;
  padding: 32px 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(4px);
  transition: transform 0.3s ease, background 0.3s ease;
}

.stats-band .stat-item:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.08);
}

.stats-band .stat-number {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent-light);
  line-height: 1.2;
  margin-bottom: 6px;
}

.stats-band .stat-label {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.75);
}

@media (max-width: 768px) {
  .stats-band .stat-number {
    font-size: 1.8rem;
  }
  .stats-band .stat-item {
    padding: 20px 14px;
  }
}

/* ========== 分类入口 ========== */
.category-section {
  padding: var(--spacing-section) 0;
  background: var(--light-bg);
}

.category-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: block;
  height: 100%;
  background-size: cover;
  background-position: center;
  min-height: 340px;
  box-shadow: var(--shadow-md);
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.category-card1 {
  background-image: linear-gradient(180deg, rgba(13, 31, 45, 0.2), rgba(13, 31, 45, 0.75)), url('/assets/images/coverpic/cover-1.png');
}

.category-card2 {
  background-image: linear-gradient(180deg, rgba(13, 31, 45, 0.2), rgba(13, 31, 45, 0.75)), url('/assets/images/coverpic/cover-2.png');
}

.category-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
}

.category-card .category-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 32px;
  color: #fff;
}

.category-card .category-tag {
  display: inline-block;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 5px 16px;
  border-radius: 50px;
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
  backdrop-filter: blur(6px);
}

.category-card h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 10px;
  line-height: 1.3;
}

.category-card p {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 20px;
  line-height: 1.7;
}

.category-card .category-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 4px;
  transition: gap 0.3s;
}

.category-card .category-link:hover {
  gap: 14px;
  color: #fff;
}

/* ========== 资讯列表 ========== */
.news-section {
  padding: var(--spacing-section) 0;
  background: var(--white);
}

.news-list {
  max-width: 860px;
  margin: 0 auto;
}

.news-item {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s ease;
}

.news-item:last-child {
  border-bottom: none;
}

.news-item:hover {
  background: rgba(244, 247, 250, 0.5);
  margin-left: -18px;
  padding-left: 18px;
  margin-right: -18px;
  padding-right: 18px;
  border-radius: var(--radius-md);
}

.news-meta {
  flex-shrink: 0;
  min-width: 150px;
  padding-top: 4px;
}

.news-category {
  display: inline-block;
  font-size: 0.74rem;
  font-weight: 600;
  color: var(--primary-bright);
  background: rgba(58, 143, 191, 0.08);
  padding: 4px 14px;
  border-radius: 50px;
  margin-bottom: 6px;
}

.news-date {
  display: block;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.news-body {
  flex: 1;
}

.news-body h3 {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
  line-height: 1.5;
}

.news-body h3 a {
  transition: color 0.2s;
}

.news-body h3 a:hover {
  color: var(--primary-bright);
}

.news-body p {
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 0;
}

.news-empty {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
  background: var(--light-bg);
  border-radius: var(--radius-lg);
  border: 1px dashed var(--border);
}

@media (max-width: 768px) {
  .news-item {
    flex-direction: column;
    gap: 8px;
  }
  .news-meta {
    min-width: 0;
    display: flex;
    align-items: center;
    gap: 12px;
  }
  .news-item:hover {
    margin-left: 0;
    padding-left: 0;
    margin-right: 0;
    padding-right: 0;
  }
}

/* ========== 流程步骤 ========== */
.process-section {
  padding: var(--spacing-section) 0;
  background: var(--light-bg);
  position: relative;
}

.process-section .container-custom {
  position: relative;
  z-index: 1;
}

.step-item {
  text-align: center;
  padding: 32px 20px;
  position: relative;
}

.step-number {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-bright));
  color: #fff;
  font-size: 1.4rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  box-shadow: 0 8px 24px rgba(26, 58, 92, 0.22);
  position: relative;
  z-index: 2;
}

.step-item h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
}

.step-item p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 0;
}

.step-arrow {
  position: absolute;
  top: 50%;
  right: -18px;
  transform: translateY(-50%);
  color: var(--primary-bright);
  font-size: 20px;
  z-index: 3;
  opacity: 0.4;
}

@media (max-width: 768px) {
  .step-arrow {
    display: none;
  }
}

/* ========== FAQ ========== */
.faq-section {
  padding: var(--spacing-section) 0;
  background: var(--white);
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  background: var(--white);
  overflow: hidden;
  transition: box-shadow 0.3s ease;
}

.faq-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: rgba(58, 143, 191, 0.3);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 600;
  color: var(--primary);
  font-size: 1rem;
  transition: background 0.2s;
  background: none;
  width: 100%;
  text-align: left;
}

.faq-question:hover {
  background: rgba(244, 247, 250, 0.5);
}

.faq-question .faq-icon {
  color: var(--primary-bright);
  transition: transform 0.3s;
  flex-shrink: 0;
  margin-left: 12px;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-answer-inner {
  padding: 0 24px 24px;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

.faq-item.open {
  box-shadow: var(--shadow-sm);
  border-color: rgba(58, 143, 191, 0.15);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
}

.faq-item.open .faq-answer {
  max-height: 300px;
}

/* ========== CTA ========== */
.cta-section {
  padding: var(--spacing-section) 0;
  background: linear-gradient(135deg, rgba(13, 31, 45, 0.94), rgba(26, 58, 92, 0.88)), url('/assets/images/backpic/back-3.png') center/cover no-repeat;
  color: #fff;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 141, 60, 0.15), transparent 70%);
}

.cta-section h2 {
  font-size: var(--font-size-title);
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
  color: #fff;
}

.cta-section p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 1.1rem;
  max-width: 640px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

.cta-section .btn-primary-custom {
  font-size: 1.05rem;
  padding: 16px 44px;
}

/* ========== 页脚 ========== */
.main-footer {
  background: var(--dark-bg);
  color: rgba(255, 255, 255, 0.7);
  padding: 60px 0 30px;
  font-size: 0.9rem;
}

.main-footer .footer-brand {
  font-size: 1.3rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.main-footer .footer-brand .brand-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--primary-bright), var(--accent));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
}

.main-footer p {
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 8px;
}

.main-footer h5 {
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 12px;
}

.main-footer h5::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

.main-footer .footer-links li {
  margin-bottom: 10px;
}

.main-footer .footer-links a {
  color: rgba(255, 255, 255, 0.6);
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.main-footer .footer-links a i {
  font-size: 0.8rem;
  color: var(--accent);
}

.main-footer .footer-links a:hover {
  color: #fff;
  padding-left: 4px;
}

.main-footer .footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin-top: 40px;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.82rem;
}

/* ========== 响应式微调 ========== */
@media (max-width: 991px) {
  .main-header .navbar {
    padding: 10px 0;
  }
  .main-header .navbar-brand {
    padding: 8px 0;
    font-size: 1.1rem;
  }
  .main-header .navbar-brand .brand-icon {
    width: 30px;
    height: 30px;
    font-size: 13px;
  }
}

@media (max-width: 520px) {
  .hero-title {
    font-size: 1.7rem;
    line-height: 1.3;
  }
  .hero-subtitle {
    font-size: 0.95rem;
  }
  .btn-primary-custom,
  .btn-outline-light-custom {
    width: 100%;
    justify-content: center;
    padding: 14px 20px;
    font-size: 0.95rem;
  }
  .hero-actions {
    flex-direction: column;
    gap: 12px;
  }
  .stats-band .stat-item {
    padding: 16px 12px;
  }
  .stats-band .stat-number {
    font-size: 1.6rem;
  }
  .category-card {
    min-height: 300px;
  }
  .section-heading h2 {
    font-size: 1.6rem;
  }
  .footer-bottom {
    flex-direction: column;
    justify-content: center;
    text-align: center;
  }
}

/* 辅助 class */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* roulang page: category1 */
:root {
  --primary: #0b1e3f;
  --primary-deep: #071530;
  --primary-light: #17356b;
  --accent: #2563eb;
  --accent-2: #22d3ee;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --bg: #f6f8fc;
  --bg-alt: #eef1f8;
  --card: #ffffff;
  --text: #0f172a;
  --text-weak: #5b6b84;
  --border: rgba(15, 23, 42, 0.08);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --shadow-md: 0 8px 24px rgba(2, 12, 27, 0.06);
  --shadow-lg: 0 18px 50px rgba(2, 12, 27, 0.10);
  --transition: all 0.3s ease;
  --header-h: 80px;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; margin: 0; padding: 0; }
.container-custom { width: 100%; max-width: 1240px; margin: 0 auto; padding: 0 24px; }
a:focus-visible, .btn:focus-visible, .form-control:focus-visible {
  outline: 3px solid rgba(34, 211, 238, 0.45);
  outline-offset: 2px;
}

/* ========== Header ========== */
.main-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.88);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
  height: var(--header-h);
  display: flex;
  align-items: center;
}
.main-header .navbar { padding: 0; min-height: var(--header-h); }
.main-header .container-custom { display: flex; align-items: center; justify-content: space-between; }
.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--primary) !important;
  letter-spacing: -0.02em;
}
.brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
  border-radius: 12px;
  font-size: 1.05rem;
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.3);
}
.desktop-nav .nav-link {
  color: var(--text);
  font-weight: 500;
  padding: 9px 16px;
  border-radius: 10px;
  position: relative;
  transition: var(--transition);
}
.desktop-nav .nav-link:hover { color: var(--accent); background: rgba(37, 99, 235, 0.06); }
.desktop-nav .nav-link.active {
  color: var(--accent);
  font-weight: 600;
  background: rgba(37, 99, 235, 0.08);
}
.header-btn {
  background: var(--primary);
  color: #fff !important;
  border: none;
  border-radius: 12px;
  padding: 10px 22px;
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: 0 6px 18px rgba(11, 30, 63, 0.22);
  transition: var(--transition);
}
.header-btn:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(11, 30, 63, 0.25);
}
.header-btn:active { transform: translateY(0); }

/* ========== Section 通用 ========== */
.section { padding: 90px 0; position: relative; }
.bg-alt { background: var(--bg-alt); }
.section-head { max-width: 720px; margin: 0 auto 48px; text-align: center; }
.section-tag {
  display: inline-block;
  background: rgba(37, 99, 235, 0.1);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 14px;
  letter-spacing: 0.05em;
}
.section-head h2 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.03em;
  line-height: 1.25;
  margin-bottom: 14px;
}
.section-head p { color: var(--text-weak); font-size: 1.05rem; margin-bottom: 0; }

/* ========== Breadcrumb == ========== */
.hero-breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.9rem; color: rgba(255, 255, 255, 0.7); margin-bottom: 18px; flex-wrap: wrap; }
.hero-breadcrumb a { color: rgba(255, 255, 255, 0.7); transition: var(--transition); }
.hero-breadcrumb a:hover { color: var(--accent-2); }
.hero-breadcrumb .separator { color: rgba(255, 255, 255, 0.4); }

/* ========== Page Hero ========== */
.page-hero {
  position: relative;
  background-size: cover;
  background-position: center;
  padding: 130px 0 110px;
  overflow: hidden;
}
.page-hero .hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, rgba(7, 21, 48, 0.92) 15%, rgba(7, 21, 48, 0.62) 55%, rgba(11, 30, 63, 0.3) 100%);
}
.page-hero .hero-content { position: relative; z-index: 2; max-width: 960px; }
.page-hero h1 {
  color: #fff;
  font-size: 3.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 18px;
}
.page-hero .hero-desc {
  color: rgba(255, 255, 255, 0.82);
  font-size: 1.2rem;
  max-width: 620px;
  margin-bottom: 30px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-hero-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--accent), #1d4ed8);
  color: #fff !important;
  border: none;
  padding: 13px 30px;
  border-radius: 14px;
  font-weight: 600;
  font-size: 1rem;
  box-shadow: 0 10px 28px rgba(37, 99, 235, 0.35);
  transition: var(--transition);
}
.btn-hero-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 34px rgba(37, 99, 235, 0.4); }
.btn-hero-ghost {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.1);
  color: #fff !important;
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: 13px 30px;
  border-radius: 14px;
  font-weight: 500;
  transition: var(--transition);
}
.btn-hero-ghost:hover { background: rgba(255, 255, 255, 0.2); border-color: rgba(255, 255, 255, 0.4); transform: translateY(-2px); }

/* ========== 分类概述 ========== */
.intro-section { background: var(--bg); }
.intro-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  height: 100%;
  transition: var(--transition);
}
.intro-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: rgba(37, 99, 235, 0.12); }
.intro-card .icon-box {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
  background: rgba(37, 99, 235, 0.1);
  color: var(--accent);
}
.intro-card:nth-child(2) .icon-box { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.intro-card:nth-child(3) .icon-box { background: rgba(245, 158, 11, 0.12); color: var(--warning); }
.intro-card h3 { font-size: 1.15rem; font-weight: 700; color: var(--primary); margin-bottom: 10px; }
.intro-card p { color: var(--text-weak); font-size: 0.95rem; margin: 0; }

/* ========== 指南卡片 ========== */
.guide-card {
  background: var(--card);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  height: 100%;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}
.guide-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.guide-card .cover-wrap { position: relative; overflow: hidden; aspect-ratio: 16 / 9; }
.guide-card .cover-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
.guide-card:hover .cover-wrap img { transform: scale(1.05); }
.guide-card .cover-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 45%, rgba(7, 21, 48, 0.5) 100%);
}
.guide-card .guide-body { padding: 26px 24px 28px; display: flex; flex-direction: column; flex: 1; }
.guide-card .guide-tag {
  display: inline-block;
  align-self: flex-start;
  background: rgba(37, 99, 235, 0.1);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 4px 12px;
  border-radius: 100px;
  margin-bottom: 14px;
}
.guide-card h3 { font-size: 1.16rem; font-weight: 700; color: var(--primary); margin-bottom: 10px; }
.guide-card p { color: var(--text-weak); font-size: 0.92rem; margin-bottom: 16px; flex: 1; }
.guide-card .guide-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.9rem;
}
.guide-card .guide-link:hover { gap: 10px; color: var(--primary); }

/* ========== 流程 ========== */
.process-section { background: var(--primary); position: relative; overflow: hidden; }
.process-section::before {
  content: "";
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.18) 0%, transparent 70%);
  top: -180px;
  right: -120px;
  pointer-events: none;
}
.process-section .section-head h2 { color: #fff; }
.process-section .section-head p { color: rgba(255, 255, 255, 0.65); }
.process-section .section-tag { background: rgba(34, 211, 238, 0.15); color: var(--accent-2); }
.process-step { position: relative; padding: 34px 26px; background: rgba(255, 255, 255, 0.06); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: var(--radius-md); height: 100%; backdrop-filter: blur(4px); transition: var(--transition); }
.process-step:hover { background: rgba(255, 255, 255, 0.1); transform: translateY(-4px); }
.process-step .step-num {
  font-size: 2.4rem;
  font-weight: 800;
  color: rgba(34, 211, 238, 0.5);
  line-height: 1;
  margin-bottom: 16px;
}
.process-step h3 { color: #fff; font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; }
.process-step p { color: rgba(255, 255, 255, 0.65); font-size: 0.92rem; margin: 0; }
.step-arrow {
  position: absolute;
  top: 50%;
  right: -28px;
  transform: translateY(-50%);
  color: var(--accent-2);
  font-size: 1.2rem;
  z-index: 2;
  opacity: 0.7;
  display: none;
}
@media (min-width: 992px) {
  .step-arrow { display: block; }
}

/* ========== 问题排查 ========== */
.troubleshoot-list .list-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  margin-bottom: 14px;
  transition: var(--transition);
}
.troubleshoot-list .list-item:hover { border-color: rgba(37, 99, 235, 0.15); box-shadow: var(--shadow-md); transform: translateX(4px); }
.troubleshoot-list .list-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  background: rgba(37, 99, 235, 0.1);
  color: var(--accent);
  flex-shrink: 0;
}
.troubleshoot-list .list-body h4 { font-size: 1.02rem; font-weight: 700; color: var(--primary); margin-bottom: 4px; }
.troubleshoot-list .list-body p { color: var(--text-weak); font-size: 0.88rem; margin: 0; }
.diagnose-card {
  background: linear-gradient(145deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
  color: #fff;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.diagnose-card::before {
  content: "";
  position: absolute;
  right: -70px;
  bottom: -70px;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.25) 0%, transparent 70%);
}
.diagnose-card h3 { font-size: 1.35rem; font-weight: 800; margin-bottom: 14px; }
.diagnose-card p { color: rgba(255, 255, 255, 0.7); font-size: 0.92rem; margin-bottom: 22px; }
.diagnose-list li { display: flex; align-items: center; gap: 10px; padding: 9px 0; color: rgba(255, 255, 255, 0.85); font-size: 0.95rem; }
.diagnose-list li i { color: var(--accent-2); font-size: 0.9rem; }
.diagnose-card .diagnose-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: #fff;
  color: var(--primary) !important;
  padding: 12px 24px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.92rem;
  margin-top: 12px;
  transition: var(--transition);
}
.diagnose-card .diagnose-btn:hover { background: var(--accent-2); color: var(--primary) !important; transform: translateY(-2px); }

/* ========== FAQ ========== */
.faq-accordion .accordion-item {
  border: 1px solid var(--border) !important;
  border-radius: var(--radius-md) !important;
  margin-bottom: 14px;
  overflow: hidden;
  background: var(--card);
  box-shadow: 0 2px 8px rgba(2, 12, 27, 0.03);
  transition: var(--transition);
}
.faq-accordion .accordion-item:hover { border-color: rgba(37, 99, 235, 0.18) !important; box-shadow: var(--shadow-md); }
.faq-accordion .accordion-button {
  background: var(--card);
  color: var(--primary);
  font-weight: 700;
  font-size: 1rem;
  padding: 22px 24px;
  box-shadow: none !important;
  border-radius: var(--radius-md) !important;
}
.faq-accordion .accordion-button:not(.collapsed) { color: var(--accent); background: rgba(37, 99, 235, 0.03); }
.faq-accordion .accordion-button::after { background-size: 1rem; }
.faq-accordion .accordion-body { color: var(--text-weak); font-size: 0.95rem; padding: 0 24px 22px; background: var(--card); border-radius: 0 0 var(--radius-md) var(--radius-md); }

/* ========== CTA ========== */
.cta-section { background: var(--bg); }
.cta-box {
  position: relative;
  background: linear-gradient(120deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: var(--radius-lg);
  padding: 58px 50px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
  box-shadow: var(--shadow-lg);
}
.cta-box::before {
  content: "";
  position: absolute;
  width: 340px;
  height: 340px;
  background: radial-gradient(circle, rgba(34, 211, 238, 0.2) 0%, transparent 60%);
  top: -120px;
  right: -60px;
}
.cta-box h2 { color: #fff; font-size: 1.8rem; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 10px; position: relative; z-index: 2; }
.cta-box p { color: rgba(255, 255, 255, 0.7); margin-bottom: 0; font-size: 0.98rem; position: relative; z-index: 2; }
.cta-box .btn-cta {
  background: var(--accent-2);
  color: var(--primary) !important;
  border: none;
  padding: 14px 34px;
  border-radius: 14px;
  font-weight: 700;
  font-size: 1rem;
  position: relative;
  z-index: 2;
  box-shadow: 0 10px 30px rgba(34, 211, 238, 0.25);
  transition: var(--transition);
}
.cta-box .btn-cta:hover { background: #fff; transform: translateY(-3px); box-shadow: 0 16px 38px rgba(34, 211, 238, 0.3); }

/* ========== Footer ========== */
.main-footer {
  background: var(--primary-deep);
  color: rgba(255, 255, 255, 0.7);
  padding: 70px 0 0;
  font-size: 0.92rem;
}
.main-footer .footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.3rem;
  color: #fff;
  font-weight: 800;
  margin-bottom: 16px;
}
.main-footer .footer-brand .brand-icon { background: linear-gradient(135deg, var(--accent-2), var(--accent)); }
.main-footer p { color: rgba(255, 255, 255, 0.6); font-size: 0.9rem; line-height: 1.75; max-width: 340px; }
.main-footer h5 { color: #fff; font-size: 1rem; font-weight: 700; margin-bottom: 20px; }
.footer-links li { margin-bottom: 10px; }
.footer-links a {
  color: rgba(255, 255, 255, 0.62);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 0.9rem;
  transition: var(--transition);
}
.footer-links a:hover { color: var(--accent-2); padding-left: 4px; }
.footer-links a i { font-size: 0.65rem; color: rgba(255, 255, 255, 0.3); }
.footer-bottom {
  margin-top: 50px;
  padding: 22px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  color: rgba(255, 255, 255, 0.4);
  font-size: 0.85rem;
}

/* ========== 移动端底部 Tab ========== */
.mobile-tabbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1050;
  display: flex;
  justify-content: space-around;
  align-items: center;
  background: rgba(255, 255, 255, 0.94);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-top: 1px solid rgba(15, 23, 42, 0.06);
  padding: 10px 8px calc(10px + env(safe-area-inset-bottom));
  box-shadow: 0 -6px 24px rgba(2, 12, 27, 0.06);
}
.mobile-tabbar .tab-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  font-size: 0.72rem;
  color: var(--text-weak);
  padding: 6px 14px;
  border-radius: 12px;
  transition: var(--transition);
}
.mobile-tabbar .tab-item i { font-size: 1.05rem; }
.mobile-tabbar .tab-item:hover { color: var(--accent); }
.mobile-tabbar .tab-item.active { color: var(--accent); font-weight: 700; background: rgba(37, 99, 235, 0.08); }

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .page-hero { padding: 100px 0 90px; }
  .page-hero h1 { font-size: 2.6rem; }
}
@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .section-head h2 { font-size: 1.75rem; }
  .page-hero { padding: 90px 0 80px; }
  .page-hero h1 { font-size: 2.2rem; }
  .hero-desc { font-size: 1rem; }
  .cta-box { padding: 42px 30px; text-align: center; justify-content: center; }
  .main-footer { padding-top: 50px; }
  .footer-bottom { justify-content: center; text-align: center; }
}
@media (max-width: 520px) {
  .container-custom { padding: 0 16px; }
  .section { padding: 50px 0; }
  .page-hero h1 { font-size: 1.85rem; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .section-head h2 { font-size: 1.5rem; }
  .intro-card, .guide-card .guide-body, .diagnose-card, .cta-box { padding: 22px 20px; }
  .process-step { padding: 24px 20px; }
  .troubleshoot-list .list-item { padding: 18px 16px; gap: 10px; }
  .cta-box .btn-cta { width: 100%; text-align: center; }
  body { padding-bottom: 70px; }
}
@media (min-width: 521px) {
  body { padding-bottom: 0; }
}

/* roulang page: article */
:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --accent: #0ea5e9;
            --dark: #0f172a;
            --dark-2: #1e293b;
            --body-bg: #f8fafc;
            --card-bg: #ffffff;
            --text: #1e293b;
            --text-light: #64748b;
            --border: #e2e8f0;
            --radius: 16px;
            --radius-sm: 8px;
            --shadow: 0 4px 24px rgba(15, 23, 42, 0.08);
            --shadow-lg: 0 8px 40px rgba(15, 23, 42, 0.12);
            --transition: all 0.3s ease;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            margin: 0;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC",
                "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            font-size: 16px;
            line-height: 1.75;
            color: var(--text);
            background: var(--body-bg);
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }

        a:hover {
            color: var(--primary-dark);
        }

        img {
            max-width: 100%;
            height: auto;
        }

        .container-custom {
            max-width: 1320px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* ===== Header & Nav ===== */
        .main-header {
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.7);
            position: sticky;
            top: 0;
            z-index: 1050;
            padding: 0;
        }

        .main-header .navbar {
            min-height: 72px;
            padding: 12px 0;
        }

        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.3rem;
            font-weight: 800;
            color: var(--dark);
            letter-spacing: 0.5px;
        }

        .navbar-brand:hover {
            color: var(--primary);
        }

        .brand-icon {
            width: 40px;
            height: 40px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            border-radius: 12px;
            color: #fff;
            font-size: 1.1rem;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
        }

        .desktop-nav .nav-link {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-light);
            padding: 8px 16px;
            border-radius: 10px;
            transition: var(--transition);
        }

        .desktop-nav .nav-link:hover {
            color: var(--primary);
            background: var(--primary-light);
        }

        .desktop-nav .nav-link.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 700;
        }

        .header-btn {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            font-size: 0.9rem;
            padding: 10px 20px;
            border-radius: 12px;
            border: none;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
            transition: var(--transition);
            white-space: nowrap;
        }

        .header-btn:hover,
        .header-btn:focus {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
        }

        /* ===== Mobile Bottom Tabs ===== */
        .mobile-bottom-tabs {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid var(--border);
            z-index: 1050;
            padding: 8px 0 calc(8px + env(safe-area-inset-bottom));
            box-shadow: 0 -4px 20px rgba(15, 23, 42, 0.08);
        }

        .mobile-bottom-tabs .d-flex {
            width: 100%;
        }

        .mobile-tab {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
            padding: 6px 0;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--text-light);
            border-radius: 12px;
            transition: var(--transition);
        }

        .mobile-tab i {
            font-size: 1.2rem;
        }

        .mobile-tab.active {
            color: var(--primary);
        }

        .mobile-tab:hover {
            color: var(--primary);
            background: var(--primary-light);
        }

        /* ===== Article Hero ===== */
        .article-header {
            position: relative;
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            padding: 72px 0 56px;
            color: #fff;
        }

        .article-header::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 42, 0.88), rgba(37, 99, 235, 0.72));
            border-radius: 0;
        }

        .article-header .container-custom {
            position: relative;
            z-index: 2;
        }

        .breadcrumb-nav {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            margin-bottom: 16px;
            color: rgba(255, 255, 255, 0.7);
        }

        .breadcrumb-nav a {
            color: rgba(255, 255, 255, 0.85);
            font-weight: 500;
            transition: var(--transition);
        }

        .breadcrumb-nav a:hover {
            color: #fff;
        }

        .breadcrumb-nav .separator {
            color: rgba(255, 255, 255, 0.4);
        }

        .breadcrumb-nav .current {
            color: rgba(255, 255, 255, 0.65);
            max-width: 300px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .article-header h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.35;
            margin: 0 0 20px;
            color: #fff;
            letter-spacing: -0.5px;
        }

        .article-header-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.85);
        }

        .article-header-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .article-header-meta .badge {
            background: rgba(255, 255, 255, 0.18);
            color: #fff;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            backdrop-filter: blur(4px);
        }

        /* ===== Article Body ===== */
        .article-main-wrap {
            padding: 48px 0 20px;
        }

        .article-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            padding: 40px;
            margin-bottom: 32px;
        }

        .article-content-body {
            font-size: 1rem;
            line-height: 1.9;
            color: var(--text);
        }

        .article-content-body h2 {
            font-size: 1.55rem;
            font-weight: 700;
            margin: 2rem 0 1rem;
            padding-left: 14px;
            border-left: 4px solid var(--primary);
            line-height: 1.4;
        }

        .article-content-body h3 {
            font-size: 1.25rem;
            font-weight: 600;
            margin: 1.5rem 0 0.75rem;
            line-height: 1.4;
        }

        .article-content-body p {
            margin: 1rem 0;
        }

        .article-content-body img {
            max-width: 100%;
            border-radius: var(--radius-sm);
            height: auto;
            box-shadow: var(--shadow);
        }

        .article-content-body ul,
        .article-content-body ol {
            padding-left: 1.5rem;
            margin: 1rem 0;
        }

        .article-content-body li {
            margin: 0.5rem 0;
        }

        .article-content-body blockquote {
            background: var(--primary-light);
            border-left: 4px solid var(--primary);
            padding: 1rem 1.25rem;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            margin: 1.5rem 0;
            font-style: italic;
            color: var(--dark-2);
        }

        .article-content-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            border-radius: var(--radius-sm);
            overflow: hidden;
            border: 1px solid var(--border);
        }

        .article-content-body table th,
        .article-content-body table td {
            padding: 12px 16px;
            border: 1px solid var(--border);
            text-align: left;
        }

        .article-content-body table th {
            background: #f1f5f9;
            font-weight: 600;
        }

        .article-content-body code {
            background: #f1f5f9;
            padding: 2px 8px;
            border-radius: 4px;
            font-family: "SF Mono", "Cascadia Code", Consolas, monospace;
            font-size: 0.9em;
        }

        .article-content-body pre {
            background: var(--dark);
            color: #e2e8f0;
            padding: 1.25rem;
            border-radius: var(--radius-sm);
            overflow-x: auto;
            font-size: 0.9rem;
            line-height: 1.7;
            margin: 1.5rem 0;
        }

        .article-content-body pre code {
            background: transparent;
            padding: 0;
            color: inherit;
            font-size: inherit;
        }

        .article-content-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 3px;
        }

        .article-content-body a:hover {
            color: var(--primary-dark);
        }

        /* ===== Not Found Box ===== */
        .not-found-box {
            text-align: center;
            padding: 60px 24px;
        }

        .not-found-box .not-found-icon {
            font-size: 3.5rem;
            color: #cbd5e1;
            margin-bottom: 16px;
        }

        .not-found-box h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
        }

        .not-found-box p {
            color: var(--text-light);
            font-size: 1rem;
            margin-bottom: 28px;
            max-width: 400px;
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== Article Tags ===== */
        .article-tags-section {
            padding: 16px 0 40px;
        }

        .tags-wrap {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            justify-content: center;
        }

        .badge-tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 24px;
            padding: 6px 14px;
            font-size: 0.82rem;
            font-weight: 500;
            color: var(--text-light);
            transition: var(--transition);
        }

        .badge-tag:hover {
            background: var(--primary-light);
            border-color: var(--primary);
            color: var(--primary);
        }

        .badge-tag i {
            color: var(--primary);
            font-size: 0.75rem;
        }

        /* ===== Related Posts ===== */
        .related-posts-section {
            padding: 48px 0;
            background: #fff;
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .section-title-wrap {
            text-align: center;
            margin-bottom: 40px;
        }

        .section-title-wrap h2 {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 8px;
        }

        .section-title-wrap p {
            color: var(--text-light);
            font-size: 0.95rem;
            max-width: 500px;
            margin: 0 auto;
        }

        .related-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            overflow: hidden;
            border: 1px solid var(--border);
            box-shadow: var(--shadow);
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
            margin-bottom: 24px;
        }

        .related-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: rgba(37, 99, 235, 0.3);
        }

        .related-card .related-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            object-position: center;
            transition: transform 0.5s ease;
        }

        .related-card:hover .related-img {
            transform: scale(1.04);
        }

        .related-card-body {
            padding: 20px 20px 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .related-card-body h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--dark);
            line-height: 1.4;
            margin-bottom: 8px;
        }

        .related-card-body p {
            font-size: 0.88rem;
            color: var(--text-light);
            flex: 1;
            margin-bottom: 14px;
        }

        .related-card-body .btn-link-card {
            align-self: flex-start;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--primary);
            transition: var(--transition);
        }

        .related-card-body .btn-link-card:hover {
            gap: 10px;
            color: var(--primary-dark);
        }

        /* ===== FAQ Section ===== */
        .faq-section {
            padding: 60px 0;
        }

        .faq-wrap {
            max-width: 860px;
            margin: 0 auto;
        }

        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 20px 24px;
            margin-bottom: 16px;
            transition: var(--transition);
            box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
        }

        .faq-item:hover {
            border-color: rgba(37, 99, 235, 0.2);
            box-shadow: var(--shadow);
        }

        .faq-item h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .faq-item h3 i {
            color: var(--primary);
            font-size: 0.9rem;
        }

        .faq-item p {
            font-size: 0.92rem;
            color: var(--text-light);
            margin: 0;
            padding-left: 24px;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 60px 0;
            background-image: linear-gradient(135deg, rgba(15, 23, 42, 0.92), rgba(37, 99, 235, 0.85)),
                url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            color: #fff;
        }

        .cta-inner {
            text-align: center;
            max-width: 720px;
            margin: 0 auto;
        }

        .cta-inner h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }

        .cta-inner p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 28px;
        }

        .cta-btns {
            display: flex;
            gap: 14px;
            justify-content: center;
            flex-wrap: wrap;
        }

        .btn-cta-light {
            background: #fff;
            color: var(--primary);
            font-weight: 700;
            padding: 12px 28px;
            border-radius: 12px;
            font-size: 0.95rem;
            border: none;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
            transition: var(--transition);
        }

        .btn-cta-light:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
            color: var(--primary-dark);
        }

        .btn-cta-outline {
            background: transparent;
            color: #fff;
            font-weight: 600;
            padding: 12px 28px;
            border-radius: 12px;
            font-size: 0.95rem;
            border: 2px solid rgba(255, 255, 255, 0.5);
            transition: var(--transition);
        }

        .btn-cta-outline:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            border-color: #fff;
            transform: translateY(-3px);
        }

        /* ===== Footer ===== */
        .main-footer {
            background: var(--dark);
            color: #94a3b8;
            padding: 60px 0 40px;
            font-size: 0.9rem;
        }

        .main-footer .footer-brand {
            font-size: 1.2rem;
            font-weight: 800;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 14px;
        }

        .main-footer .footer-brand .brand-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            font-size: 0.95rem;
        }

        .main-footer p {
            line-height: 1.7;
            margin: 0;
        }

        .main-footer h5 {
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: #94a3b8;
            font-size: 0.88rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .footer-links a i {
            font-size: 0.7rem;
            color: #475569;
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: #fff;
            padding-left: 4px;
        }

        .footer-links a:hover i {
            color: var(--accent);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            margin-top: 40px;
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px;
            font-size: 0.8rem;
            color: #64748b;
        }

        /* ===== Buttons ===== */
        .btn-primary-custom {
            background: var(--primary);
            color: #fff;
            font-weight: 600;
            padding: 10px 24px;
            border-radius: 12px;
            border: none;
            transition: var(--transition);
        }

        .btn-primary-custom:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(37, 99, 235, 0.25);
        }

        .btn-outline-custom {
            background: transparent;
            color: var(--primary);
            font-weight: 600;
            padding: 10px 24px;
            border-radius: 12px;
            border: 2px solid var(--primary);
            transition: var(--transition);
        }

        .btn-outline-custom:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== Focus states ===== */
        a:focus-visible,
        button:focus-visible,
        .btn:focus-visible {
            outline: 3px solid rgba(37, 99, 235, 0.4);
            outline-offset: 2px;
        }

        /* ===== Mobile Adjustments ===== */
        @media (max-width: 991.98px) {
            .container-custom {
                padding: 0 20px;
            }

            .main-header .navbar {
                justify-content: center;
                min-height: 60px;
                padding: 8px 0;
            }

            .main-header .navbar-brand {
                font-size: 1.15rem;
                margin: 0 auto;
            }

            .mobile-bottom-tabs {
                display: block;
            }

            .main-footer {
                padding-bottom: 90px;
            }

            .article-header {
                padding: 48px 0 40px;
            }

            .article-header h1 {
                font-size: 1.7rem;
            }

            .article-card {
                padding: 24px 20px;
            }

            .related-card .related-img {
                height: 170px;
            }

            .faq-item {
                padding: 16px 18px;
            }

            .cta-inner h2 {
                font-size: 1.6rem;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .container-custom {
                padding: 0 16px;
            }

            .article-header h1 {
                font-size: 1.4rem;
                line-height: 1.4;
            }

            .article-header-meta {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }

            .article-card {
                padding: 20px 16px;
                border-radius: 12px;
            }

            .article-content-body {
                font-size: 0.95rem;
                line-height: 1.85;
            }

            .article-content-body h2 {
                font-size: 1.3rem;
                padding-left: 10px;
            }

            .article-content-body h3 {
                font-size: 1.1rem;
            }

            .breadcrumb-nav .current {
                max-width: 180px;
            }

            .cta-btns {
                flex-direction: column;
                align-items: stretch;
            }

            .btn-cta-light,
            .btn-cta-outline {
                text-align: center;
                width: 100%;
            }

            .main-footer {
                padding-top: 40px;
            }

            .main-footer .row > [class*="col-"] {
                margin-bottom: 24px;
            }
        }

/* roulang page: category2 */
:root {
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --primary-light: #dbeafe;
  --accent: #0ea5e9;
  --accent-soft: #e0f2fe;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --dark: #0f172a;
  --dark-2: #1e293b;
  --dark-3: #334155;
  --text: #1e293b;
  --text-muted: #64748b;
  --bg-light: #f8fafc;
  --bg-soft: #f1f5f9;
  --border: #e2e8f0;
  --white: #ffffff;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, .08);
  --shadow-lg: 0 12px 32px rgba(15, 23, 42, .12);
  --shadow-primary: 0 4px 16px rgba(37, 99, 235, .18);
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --transition: all .25s ease;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-sans); color: var(--text); line-height: 1.7; background: var(--bg-light); -webkit-font-smoothing: antialiased; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; padding: 0; margin: 0; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }
.container-custom { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 768px) { .container-custom { padding: 0 16px; } }

/* Header */
.main-header { position: sticky; top: 0; z-index: 1000; background: rgba(255,255,255,.92); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.main-header .navbar { min-height: 68px; padding: 0; }
.navbar-brand { display: flex; align-items: center; gap: 10px; font-size: 1.15rem; font-weight: 800; color: var(--dark) !important; letter-spacing: -.01em; }
.navbar-brand .brand-icon { width: 36px; height: 36px; display: inline-flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; border-radius: 10px; font-size: .95rem; box-shadow: var(--shadow-primary); }
.navbar-nav .nav-link { font-weight: 600; color: var(--text-muted) !important; padding: 8px 14px !important; border-radius: 8px; font-size: .95rem; transition: var(--transition); }
.navbar-nav .nav-link:hover, .navbar-nav .nav-link.active { color: var(--primary) !important; background: var(--primary-light); }
.header-btn { background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff !important; border: none; padding: 9px 22px; border-radius: 10px; font-weight: 600; font-size: .92rem; box-shadow: var(--shadow-primary); transition: var(--transition); }
.header-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37, 99, 235, .28); }

/* Hero */
.hero-sec { position: relative; padding: 80px 0 70px; background: linear-gradient(135deg, rgba(15,23,42,.95), rgba(30,64,175,.88)), url('/assets/images/backpic/back-2.png') center/cover no-repeat; color: #fff; overflow: hidden; }
.hero-sec::after { content: ''; position: absolute; top: -40%; right: -20%; width: 500px; height: 500px; background: radial-gradient(circle, rgba(14,165,233,.35), transparent 65%); pointer-events: none; }
.hero-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.2); border-radius: 999px; padding: 6px 18px; font-size: .82rem; font-weight: 600; margin-bottom: 20px; }
.hero-sec h1 { font-size: clamp(1.8rem, 4vw, 2.75rem); font-weight: 800; line-height: 1.3; margin-bottom: 18px; }
.hero-sec p.lead { font-size: 1.1rem; color: rgba(255,255,255,.85); max-width: 680px; margin: 0 auto 28px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-btn-primary { background: #fff; color: var(--primary-dark) !important; padding: 12px 30px; border-radius: 12px; font-weight: 700; font-size: .95rem; box-shadow: 0 6px 24px rgba(0,0,0,.18); transition: var(--transition); }
.hero-btn-primary:hover { transform: translateY(-3px); box-shadow: 0 10px 32px rgba(0,0,0,.25); }
.hero-btn-outline { border: 1px solid rgba(255,255,255,.45); color: #fff !important; padding: 12px 30px; border-radius: 12px; font-weight: 600; font-size: .95rem; transition: var(--transition); }
.hero-btn-outline:hover { background: rgba(255,255,255,.1); border-color: #fff; }
.hero-metrics { display: flex; justify-content: center; gap: 40px; margin-top: 50px; flex-wrap: wrap; }
.hero-metrics .metric { text-align: center; }
.hero-metrics .num { font-size: 1.8rem; font-weight: 800; color: #fff; }
.hero-metrics .label { font-size: .85rem; color: rgba(255,255,255,.7); }

/* Sections */
.section-pad { padding: 80px 0; }
.section-alt { background: #fff; }
.section-tag { display: inline-block; font-size: .82rem; font-weight: 700; color: var(--primary); background: var(--primary-light); padding: 5px 14px; border-radius: 999px; margin-bottom: 12px; letter-spacing: .03em; }
.section-title { font-size: clamp(1.6rem, 3vw, 2.15rem); font-weight: 800; color: var(--dark); line-height: 1.3; margin-bottom: 14px; }
.section-desc { font-size: 1rem; color: var(--text-muted); max-width: 720px; margin: 0 auto 42px; }

/* Cards */
.feature-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 30px 24px; transition: var(--transition); height: 100%; }
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.feature-icon { width: 56px; height: 56px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 1.35rem; margin-bottom: 18px; }
.feature-icon.i-blue { background: var(--primary-light); color: var(--primary); }
.feature-icon.i-sky { background: var(--accent-soft); color: var(--accent); }
.feature-icon.i-green { background: #d1fae5; color: var(--success); }
.feature-icon.i-amber { background: #fef3c7; color: var(--warning); }
.feature-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 10px; color: var(--dark); }
.feature-card p { font-size: .92rem; color: var(--text-muted); margin: 0; }

/* Tech band */
.tech-band { position: relative; padding: 90px 0; background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%); color: #fff; overflow: hidden; }
.tech-band::before { content: ''; position: absolute; top: -50%; left: -15%; width: 400px; height: 400px; background: radial-gradient(circle, rgba(37,99,235,.3), transparent 70%); }
.tech-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; position: relative; z-index: 2; }
.tech-item { background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.1); border-radius: var(--radius-md); padding: 24px 22px; transition: var(--transition); }
.tech-item:hover { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.25); }
.tech-item i { font-size: 1.3rem; color: var(--accent); margin-bottom: 12px; }
.tech-item h4 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.tech-item p { font-size: .86rem; color: rgba(255,255,255,.65); margin: 0; }
.tech-status { display: flex; align-items: center; gap: 8px; margin-top: 14px; font-size: .82rem; font-weight: 600; color: #6ee7b7; }
.tech-status .dot { width: 8px; height: 8px; background: #10b981; border-radius: 50%; box-shadow: 0 0 10px rgba(16,185,129,.6); animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .5; } }

/* Steps */
.steps-section { padding: 80px 0; background: #fff; }
.step-card { text-align: center; padding: 30px 20px; position: relative; }
.step-num { width: 64px; height: 64px; margin: 0 auto 18px; background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; font-weight: 800; font-size: 1.25rem; border-radius: 50%; display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-primary); }
.step-card h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 10px; }
.step-card p { font-size: .9rem; color: var(--text-muted); max-width: 260px; margin: 0 auto; }
.step-line { position: absolute; top: 62px; left: calc(50% + 32px); width: calc(100% - 64px); height: 2px; background: var(--border); }
.step-line::before { content: ''; position: absolute; top: -3px; right: 0; width: 8px; height: 8px; border-radius: 50%; background: var(--primary); }

/* FAQ */
.faq-section { background: var(--bg-soft); }
.accordion-item { background: var(--white); border: 1px solid var(--border) !important; border-radius: var(--radius-md) !important; margin-bottom: 14px; overflow: hidden; }
.accordion-button { font-weight: 600; color: var(--dark); padding: 18px 22px; font-size: .98rem; }
.accordion-button:not(.collapsed) { background: var(--primary-light); color: var(--primary-dark); }
.accordion-button:focus { box-shadow: none; border-color: var(--primary); }
.accordion-body { padding: 18px 22px; font-size: .92rem; color: var(--text-muted); line-height: 1.8; }

/* CTA */
.cta-section { position: relative; padding: 80px 0; background: linear-gradient(135deg, #1e40af, #0ea5e9), url('/assets/images/backpic/back-3.png') center/cover no-repeat; background-blend-mode: overlay; }
.cta-section h2 { font-size: clamp(1.5rem, 3vw, 2rem); font-weight: 800; color: #fff; margin-bottom: 14px; }
.cta-section p { color: rgba(255,255,255,.85); max-width: 640px; margin: 0 auto 28px; font-size: 1rem; }
.cta-btn { background: #fff; color: var(--primary-dark) !important; padding: 14px 38px; border-radius: 12px; font-weight: 700; font-size: 1rem; box-shadow: 0 8px 30px rgba(0,0,0,.2); transition: var(--transition); display: inline-block; }
.cta-btn:hover { transform: translateY(-3px); box-shadow: 0 12px 36px rgba(0,0,0,.28); }

/* Footer */
.main-footer { background: var(--dark); color: #94a3b8; padding: 64px 0 0; }
.main-footer h5 { color: #fff; font-size: 1rem; font-weight: 700; margin-bottom: 18px; }
.main-footer p { font-size: .9rem; line-height: 1.8; }
.footer-brand { display: flex; align-items: center; gap: 10px; font-size: 1.15rem; font-weight: 800; color: #fff; margin-bottom: 16px; }
.footer-brand .brand-icon { width: 36px; height: 36px; background: linear-gradient(135deg, var(--primary), var(--accent)); border-radius: 10px; display: inline-flex; align-items: center; justify-content: center; color: #fff; font-size: .9rem; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { font-size: .9rem; color: #94a3b8; transition: var(--transition); display: inline-flex; align-items: center; gap: 6px; }
.footer-links a:hover { color: #fff; padding-left: 4px; }
.footer-links i { font-size: .65rem; color: var(--accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding: 22px 0; margin-top: 48px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; font-size: .85rem; color: #64748b; }

/* Mobile bottom tab */
.mobile-tabbar { display: none; }
@media (max-width: 991.98px) {
  .desktop-nav { display: none !important; }
  .mobile-tabbar { display: flex; position: fixed; bottom: 0; left: 0; right: 0; z-index: 1200; background: rgba(255,255,255,.95); backdrop-filter: blur(12px); border-top: 1px solid var(--border); padding: 8px 4px calc(8px + env(safe-area-inset-bottom)); justify-content: space-around; box-shadow: 0 -4px 20px rgba(15,23,42,.08); }
  .mobile-tabbar a { display: flex; flex-direction: column; align-items: center; gap: 4px; font-size: .72rem; font-weight: 600; color: var(--text-muted); padding: 4px 10px; border-radius: 8px; transition: var(--transition); }
  .mobile-tabbar a i { font-size: 1.15rem; }
  .mobile-tabbar a.active { color: var(--primary); }
  .mobile-tabbar a.active i { transform: translateY(-2px); }
  body { padding-bottom: 64px; }
  .section-pad { padding: 56px 0; }
}

/* Responsive */
@media (max-width: 768px) {
  .hero-sec { padding: 60px 0 56px; }
  .hero-metrics { gap: 28px; }
  .hero-metrics .num { font-size: 1.4rem; }
  .step-line { display: none; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 520px) {
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-btn-primary, .hero-btn-outline { text-align: center; }
  .section-title { font-size: 1.4rem; }
}