/* roulang page: index */
:root {
      --deep-space: #0A0E27;
      --coral-red: #FF4655;
      --neon-green: #00E5A0;
      --bg-light: #F4F5FA;
      --dark-section: #060B1C;
      --white: #FFFFFF;
      --text-primary: #1E2130;
      --text-secondary: #5A6070;
      --text-muted: #8A90A8;
      --border-light: rgba(10,14,39,0.08);
      --shadow-sm: 0 4px 20px rgba(10,14,39,0.06);
      --shadow-md: 0 8px 30px rgba(10,14,39,0.12);
      --radius-md: 12px;
      --radius-pill: 30px;
      --transition-smooth: 0.25s ease;
      --font-heading: 'Noto Sans SC', sans-serif;
      --font-body: 'Noto Sans SC', sans-serif;
      --font-ui: 'Inter', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --container-max: 1200px;
      --section-gap: 80px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-body);
      font-weight: 400;
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-primary);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 0.5rem;
    }

    h1 {
      font-size: 48px;
      letter-spacing: -0.5px;
    }

    h2 {
      font-size: 36px;
      letter-spacing: -0.3px;
      margin-bottom: 1.5rem;
    }

    h3 {
      font-size: 22px;
      font-weight: 700;
    }

    h4 {
      font-size: 18px;
      font-weight: 700;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    button, .button {
      cursor: pointer;
      font-family: var(--font-ui);
      font-weight: 600;
      border: none;
      outline: none;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    section {
      padding: var(--section-gap) 0;
    }

    /* Foundation overrides */
    .grid-container {
      max-width: var(--container-max);
    }

    .top-bar, .top-bar ul {
      background-color: transparent;
    }

    .top-bar {
      padding: 0;
    }

    /* Navigation */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background-color: var(--deep-space);
      z-index: 99;
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
      height: 70px;
      display: flex;
      align-items: center;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--white);
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 24px;
      letter-spacing: 1px;
    }

    .brand i {
      color: var(--neon-green);
      font-size: 26px;
    }

    .brand small {
      font-size: 12px;
      font-weight: 400;
      color: var(--text-muted);
      margin-left: 6px;
      letter-spacing: 0;
      font-family: var(--font-ui);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
      margin: 0;
    }

    .nav-links a {
      color: #B0B8D0;
      font-family: var(--font-ui);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
    }

    .nav-links a:hover {
      color: var(--white);
    }

    .nav-cta {
      background-color: var(--coral-red);
      color: var(--white) !important;
      padding: 10px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 15px;
      transition: background-color 0.2s, transform 0.2s;
    }

    .nav-cta:hover {
      background-color: #E63240;
      transform: scale(1.03);
    }

    .menu-icon {
      display: none;
      color: var(--white);
      font-size: 24px;
      cursor: pointer;
    }

    /* Hero */
    .hero-section {
      background-color: var(--deep-space);
      padding: 140px 0 100px;
      color: var(--white);
      position: relative;
      overflow: hidden;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-left {
      flex: 1;
    }

    .hero-left h1 {
      font-size: 52px;
      margin-bottom: 20px;
      position: relative;
      display: inline-block;
    }

    .hero-left h1::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -6px;
      width: 80px;
      height: 5px;
      background-color: var(--neon-green);
      border-radius: 4px;
    }

    .hero-subtitle {
      font-size: 18px;
      color: #B0B8D0;
      margin-bottom: 32px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .btn-outline {
      border: 2px solid var(--neon-green);
      color: var(--neon-green);
      background: transparent;
      padding: 12px 30px;
      border-radius: var(--radius-pill);
      font-weight: 600;
    }

    .btn-outline:hover {
      background: rgba(0,229,160,0.08);
    }

    .btn-solid {
      background-color: var(--coral-red);
      color: var(--white);
      padding: 12px 30px;
      border-radius: var(--radius-pill);
      font-weight: 600;
    }

    .btn-solid:hover {
      background-color: #E63240;
      transform: scale(1.03);
    }

    .hero-right {
      flex: 1;
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    }

    .hero-right img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }

    .hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(10,14,39,0.7) 0%, rgba(10,14,39,0.2) 100%);
    }

    /* Section titles */
    .section-title {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-title h2 {
      display: inline-block;
      position: relative;
    }

    .section-title h2 span {
      color: var(--coral-red);
    }

    /* Advantages */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .advantage-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      display: flex;
      gap: 20px;
      align-items: flex-start;
    }

    .advantage-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .adv-icon {
      font-size: 32px;
      color: var(--neon-green);
      flex-shrink: 0;
    }

    .adv-content h3 {
      margin-bottom: 8px;
    }

    /* Highlights irregular grid */
    .highlights-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 24px;
    }

    .highlight-wide {
      grid-row: span 2;
      background: var(--white);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .highlight-wide img {
      height: 260px;
      width: 100%;
      object-fit: cover;
    }

    .highlight-tall {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .highlight-tall i {
      color: var(--neon-green);
      font-size: 28px;
      margin-bottom: 12px;
    }

    .highlight-small {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    /* Cases waterfall */
    .cases-waterfall {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--white);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-smooth);
      display: flex;
      flex-direction: column;
    }

    .case-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .case-card img {
      height: 200px;
      width: 100%;
      object-fit: cover;
    }

    .case-tag {
      background: var(--coral-red);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin: 16px 20px 8px;
      font-family: var(--font-ui);
      font-weight: 600;
    }

    .case-card h3 {
      margin: 0 20px 8px;
    }

    .case-card p {
      margin: 0 20px 20px;
      color: var(--text-secondary);
      font-size: 15px;
    }

    /* Comparison table */
    .comparison-table {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: start;
    }

    .plan-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
    }

    .plan-recommended {
      background: #E6FFF7;
      border: 2px solid var(--neon-green);
      position: relative;
    }

    .plan-badge {
      background: var(--coral-red);
      color: white;
      font-size: 13px;
      font-weight: 700;
      padding: 6px 18px;
      border-radius: 20px;
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
    }

    .plan-feature {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 0;
      border-bottom: 1px solid var(--border-light);
      font-size: 15px;
    }

    .feature-yes {
      color: var(--neon-green);
      font-weight: 700;
    }

    .feature-no {
      color: #CCD0D8;
    }

    /* FAQ Accordion */
    .faq-section {
      background-color: var(--dark-section);
      color: white;
    }

    .accordion-item {
      border-bottom: 1px solid rgba(255,255,255,0.1);
    }

    .accordion-title {
      background: transparent;
      color: white;
      font-size: 18px;
      font-weight: 700;
      padding: 20px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      border-left: 4px solid transparent;
      padding-left: 16px;
      transition: 0.2s;
    }

    .accordion-title:hover {
      border-left-color: var(--coral-red);
    }

    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: #B0B8D0;
      padding-left: 20px;
    }

    .accordion-content p {
      padding-bottom: 20px;
    }

    .active-accordion .accordion-title {
      border-left-color: var(--coral-red);
    }

    /* CTA Banner */
    .cta-banner {
      background-color: var(--deep-space);
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      text-align: center;
      padding: 80px 0;
      color: white;
    }

    .cta-banner h2 {
      font-size: 40px;
    }

    /* Footer */
    .site-footer {
      background: var(--dark-section);
      color: var(--text-muted);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1fr;
      gap: 40px;
    }

    .footer-brand h3 {
      color: white;
    }

    .social-icons i {
      font-size: 20px;
      margin-right: 20px;
      color: var(--text-muted);
      transition: 0.2s;
    }

    .social-icons i:hover {
      color: var(--coral-red);
    }

    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: 1fr 1fr; }
      .highlights-grid { grid-template-columns: 1fr 1fr; }
      .cases-waterfall { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      .hero-grid { flex-direction: column; }
      .nav-links { display: none; }
      .menu-icon { display: block; }
      .comparison-table { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 640px) {
      .advantages-grid, .highlights-grid, .cases-waterfall { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }