/* roulang page: index */
:root {
      --primary: #E8453C;
      --primary-glow: rgba(232, 69, 60, 0.25);
      --secondary: #FFB800;
      --dark-bg: #1A1D29;
      --card-bg: #222533;
      --deep-footer: #14161F;
      --light-text: #F5F5F7;
      --muted-text: #B0B3C1;
      --border-subtle: rgba(255, 255, 255, 0.06);
      --border-hover: rgba(232, 69, 60, 0.5);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-full: 24px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
      --shadow-glow: 0 12px 32px var(--primary-glow);
      --font-heading: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-body: 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      --font-number: 'Oswald', 'DIN Alternate', sans-serif;
      --font-tech: 'Rajdhani', 'Orbitron', sans-serif;
    }

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

    body {
      font-family: var(--font-body);
      background-color: var(--dark-bg);
      color: var(--light-text);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      font-weight: 600;
      transition: all 0.25s ease;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      letter-spacing: -0.02em;
    }

    h1 {
      font-size: clamp(2.5rem, 7vw, 4rem);
      font-weight: 900;
      line-height: 1.2;
    }
    h2 {
      font-size: clamp(2rem, 5vw, 2.8rem);
      font-weight: 800;
      margin-bottom: 1rem;
    }
    h3 {
      font-size: 1.3rem;
      font-weight: 700;
    }
    h4 {
      font-size: 1.1rem;
      font-weight: 600;
    }

    /* navigation */
    .navbar {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(26, 29, 41, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--primary-glow);
      padding: 12px 0;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 900;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--primary);
      mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor"><path d="M13 2L4 14h5l-1 8 9-12h-5l1-8z"/></svg>') center/contain no-repeat;
      -webkit-mask: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor"><path d="M13 2L4 14h5l-1 8 9-12h-5l1-8z"/></svg>') center/contain no-repeat;
      background: var(--secondary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }
    .nav-links a {
      color: var(--muted-text);
      font-weight: 600;
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--secondary);
      color: var(--dark-bg);
      padding: 12px 28px;
      border-radius: var(--radius-full);
      font-weight: 700;
      box-shadow: 0 4px 14px rgba(255,184,0,0.3);
    }
    .nav-cta:hover {
      background: #FFC933;
      box-shadow: 0 8px 20px rgba(255,184,0,0.5);
      transform: scale(1.02);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
    }
    .hamburger span {
      width: 28px;
      height: 3px;
      background: var(--light-text);
      border-radius: 3px;
      transition: 0.3s;
    }

    /* hero */
    .hero {
      background: radial-gradient(circle at 30% 30%, rgba(232,69,60,0.2) 0%, var(--dark-bg) 70%);
      padding: 80px 0 100px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-title {
      background: linear-gradient(to right, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--muted-text);
      margin: 1.5rem 0 2rem;
    }
    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
    }
    .btn-primary {
      background: linear-gradient(45deg, var(--primary), var(--secondary));
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-glow);
    }
    .btn-primary:hover {
      background: linear-gradient(45deg, #f0534a, #ffc933);
      box-shadow: 0 16px 36px rgba(232,69,60,0.35);
      transform: scale(1.03);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(232,69,60,0.1);
    }
    .hero-img {
      border-radius: var(--radius-lg);
      box-shadow: 0 20px 40px rgba(232,69,60,0.3);
      overflow: hidden;
    }
    .badge-floating {
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      padding: 8px 16px;
      display: inline-flex;
      align-items: baseline;
      gap: 6px;
      margin-top: 1rem;
    }
    .number-highlight {
      font-family: var(--font-number);
      color: var(--secondary);
      font-size: 2rem;
      font-weight: 700;
    }

    section {
      padding: 100px 0;
    }

    .section-title {
      margin-bottom: 3rem;
    }

    /* stats grid */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .stat-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 2rem;
      border: 1px solid var(--border-subtle);
      transition: 0.3s;
    }
    .stat-card:hover {
      border-color: var(--border-hover);
      box-shadow: var(--shadow-glow);
      transform: translateY(-4px);
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 2.5rem;
      color: var(--secondary);
      font-weight: 700;
    }

    /* products masonry */
    .masonry-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .product-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-subtle);
      transition: 0.3s;
    }
    .product-card:hover {
      border-color: var(--border-hover);
      box-shadow: var(--shadow-glow);
      transform: translateY(-6px);
    }
    .product-card img {
      height: 200px;
      object-fit: cover;
    }
    .product-body {
      padding: 1.5rem;
    }
    .tag {
      background: rgba(232,69,60,0.15);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-right: 6px;
    }

    /* cases scroll */
    .case-scroll {
      display: flex;
      overflow-x: auto;
      gap: 24px;
      padding-bottom: 1rem;
    }
    .case-card {
      min-width: 300px;
      background: var(--card-bg);
      border-left: 4px solid var(--primary);
      border-radius: var(--radius-md);
      padding: 1.5rem;
      transition: 0.3s;
    }
    .case-card:hover {
      border-left-color: var(--secondary);
      box-shadow: var(--shadow-glow);
    }

    /* compare table */
    .compare-table {
      overflow-x: auto;
      border-radius: var(--radius-md);
    }
    table {
      width: 100%;
      border-collapse: collapse;
      min-width: 600px;
    }
    th, td {
      padding: 16px;
      text-align: left;
      border-bottom: 1px solid var(--border-subtle);
    }
    .highlight-col {
      background: linear-gradient(135deg, rgba(232,69,60,0.2), transparent);
      color: white;
      font-weight: 700;
    }

    /* faq */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.08);
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--muted-text);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    /* cta banner */
    .cta-banner {
      background: linear-gradient(135deg, rgba(232,69,60,0.3), rgba(26,29,41,0.9));
      border-radius: var(--radius-lg);
      text-align: center;
      padding: 4rem 2rem;
    }
    .btn-large {
      background: var(--secondary);
      color: var(--dark-bg);
      padding: 16px 40px;
      border-radius: 50px;
      font-weight: 700;
      font-size: 1.2rem;
      animation: breathe 2s infinite;
    }
    @keyframes breathe {
      0% { transform: scale(1); }
      50% { transform: scale(1.03); }
      100% { transform: scale(1); }
    }

    /* footer */
    .footer {
      background: var(--deep-footer);
      padding: 4rem 0 2rem;
      margin-top: 60px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr;
      gap: 2rem;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .masonry-grid { grid-template-columns: repeat(2,1fr); }
      .stats-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .masonry-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }