/* roulang page: index */
/* ----- RESET & BASE ----- */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      font-weight: 400;
      font-size: 16px;
      line-height: 1.75;
      color: #3A3C4A;
      background-color: #F5F0EB;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: none;
      outline: none;
      transition: all 0.25s ease;
      font-weight: 600;
      font-size: 16px;
      line-height: 1.2;
      border-radius: 8px;
      padding: 14px 32px;
      background: transparent;
      white-space: nowrap;
    }
    button:focus-visible, .btn:focus-visible, a:focus-visible {
      outline: 2px solid #E84A2D;
      outline-offset: 2px;
      border-radius: 8px;
    }
    h1, h2, h3 {
      font-weight: 700;
      color: #1A1C2B;
      line-height: 1.3;
    }
    h1 {
      font-size: 48px;
      line-height: 1.2;
    }
    h2 {
      font-size: 36px;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    section {
      padding: 100px 0;
    }
    @media (max-width: 1024px) {
      section {
        padding: 80px 0;
      }
      h1 {
        font-size: 40px;
      }
      h2 {
        font-size: 30px;
      }
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      h1 {
        font-size: 32px;
      }
      h2 {
        font-size: 28px;
      }
      h3 {
        font-size: 20px;
      }
      .container {
        padding: 0 20px;
      }
    }

    /* ----- COLOR SYSTEM ----- */
    :root {
      --primary: #E84A2D;
      --primary-hover: #C53E26;
      --secondary-bg: #1A1C2B;
      --secondary-light: #252840;
      --warm-bg: #F5F0EB;
      --white: #FFFFFF;
      --gold: #FFB81C;
      --gold-hover: #E6A800;
      --green: #2ECC71;
      --text-dark: #1A1C2B;
      --text-body: #3A3C4A;
      --text-muted: #7A7D8C;
      --border-light: rgba(0,0,0,0.04);
      --shadow-sm: 0 4px 20px rgba(26, 28, 43, 0.06);
      --shadow-hover: 0 8px 30px rgba(232, 74, 45, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --nav-height: 76px;
    }

    /* ----- HEADER & NAVIGATION ----- */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26, 28, 43, 0.85);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      transition: background 0.3s, box-shadow 0.3s;
      height: var(--nav-height);
      display: flex;
      align-items: center;
    }
    #header.scrolled {
      background: rgba(26, 28, 43, 1);
      box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 700;
      color: #FFFFFF;
      display: flex;
      align-items: baseline;
      gap: 4px;
      letter-spacing: 0.5px;
    }
    .logo span {
      color: var(--primary);
      font-size: 22px;
      font-weight: 800;
    }
    .logo small {
      font-size: 14px;
      font-weight: 400;
      color: #ccc;
      margin-left: 4px;
      letter-spacing: 0;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: #ddd;
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: #FFFFFF;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--gold);
      color: #1A1C2B !important;
      padding: 10px 24px !important;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: 0 2px 8px rgba(255,184,28,0.3);
    }
    .nav-cta:hover {
      background: var(--gold-hover);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 8px;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: white;
      transition: 0.3s;
    }
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: #1A1C2B;
        flex-direction: column;
        justify-content: center;
        gap: 40px;
        padding: 40px;
        transition: right 0.35s ease;
        box-shadow: -5px 0 30px rgba(0,0,0,0.5);
        z-index: 999;
      }
      .nav-links.open {
        right: 0;
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
      .nav-cta {
        width: 100%;
        justify-content: center;
      }
    }

    /* ----- HERO ----- */
    #hero {
      background: linear-gradient(135deg, #1A1C2B 0%, #252840 100%);
      padding: 140px 0 100px;
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-content h1 {
      color: #FFFFFF;
      margin-bottom: 20px;
    }
    .hero-content .subtitle {
      font-size: 18px;
      color: #ccc;
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 14px rgba(232,74,45,0.4);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(232,74,45,0.5);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: rgba(232,74,45,0.08);
      transform: translateY(-2px);
    }
    .btn-gold {
      background: var(--gold);
      color: #1A1C2B;
      font-weight: 700;
    }
    .btn-gold:hover {
      background: var(--gold-hover);
      transform: translateY(-2px);
    }
    .hero-image {
      background: rgba(255,255,255,0.05);
      border-radius: 24px;
      padding: 12px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    .hero-image img {
      border-radius: 16px;
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .hero-buttons {
        justify-content: center;
      }
      #hero {
        padding: 120px 0 70px;
      }
    }

    /* ----- VALUE PROPOSITION ----- */
    .value-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 40px;
    }
    .value-item {
      text-align: center;
      padding: 32px 20px;
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: 0.25s;
    }
    .value-item:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .value-icon {
      font-size: 40px;
      color: var(--primary);
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .value-grid {
        grid-template-columns: 1fr;
      }
    }

    /* ----- FEATURES ----- */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .feature-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
      border: 1px solid transparent;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(232,74,45,0.15);
    }
    .feature-img {
      width: 100%;
      height: 160px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 16px;
    }
    @media (max-width: 1024px) {
      .features-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .features-grid {
        grid-template-columns: 1fr;
      }
    }

    /* ----- SCENARIOS ----- */
    .scenario-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 80px;
    }
    .scenario-row.reverse {
      direction: rtl;
    }
    .scenario-row.reverse .scenario-text {
      direction: ltr;
    }
    .scenario-img img {
      border-radius: 16px;
      box-shadow: var(--shadow-sm);
    }
    @media (max-width: 768px) {
      .scenario-row, .scenario-row.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
        margin-bottom: 50px;
      }
    }

    /* ----- CASES ----- */
    .stats {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
      margin: 40px 0;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }
    .logo-wall {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 32px;
      margin-top: 40px;
    }
    .logo-placeholder {
      width: 100px;
      height: 40px;
      background: #e0dcd7;
      border-radius: 6px;
    }

    /* ----- PRICING ----- */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .pricing-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      border: 1px solid transparent;
      position: relative;
    }
    .pricing-card.featured {
      border-color: var(--primary);
      box-shadow: var(--shadow-hover);
    }
    .badge {
      background: var(--gold);
      color: #1A1C2B;
      font-weight: 700;
      padding: 4px 16px;
      border-radius: 20px;
      font-size: 14px;
      position: absolute;
      top: -12px;
      right: 20px;
    }
    .price {
      font-size: 42px;
      font-weight: 800;
      color: #1A1C2B;
      margin: 16px 0;
    }
    @media (max-width: 768px) {
      .pricing-grid {
        grid-template-columns: 1fr;
      }
    }

    /* ----- FAQ ----- */
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }
    .faq-item {
      background: var(--white);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      width: 100%;
      background: transparent;
      padding: 20px 24px;
      font-weight: 600;
      justify-content: space-between;
      color: #1A1C2B;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 24px;
      color: #3A3C4A;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }

    /* ----- FOOTER ----- */
    #footer {
      background: #1A1C2B;
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 24px;
      margin-bottom: 32px;
    }
    .footer-info p {
      margin-top: 8px;
    }
    .copyright {
      text-align: center;
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      font-size: 14px;
    }