/* roulang page: index */
:root {
      --bg-base: #0a0b0e;
      --bg-surface: #12141a;
      --bg-surface-elevated: #1a1d26;
      --bg-overlay: rgba(10, 11, 14, 0.78);
      --primary: #ff2a5f;
      --primary-hover: #ff4777;
      --accent: #00f0ff;
      --accent-glow: rgba(0, 240, 255, 0.2);
      --text-main: #f5f6fa;
      --text-muted: #9aa1b2;
      --text-sub: #6f778a;
      --border-color: #262a36;
      --border-focus: #ff2a5f;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.35);
      --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.6);
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      --container-max: 1200px;
    }

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

    body {
      background-color: var(--bg-base);
      color: var(--text-main);
      font-family: var(--font-stack);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
      padding-bottom: 74px;
    }

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-md);
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Header & Nav */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(10, 11, 14, 0.92);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
      height: 70px;
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 22px;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: #fff;
    }

    .brand-logo span {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--text-main);
    }

    .nav-action .btn-primary {
      padding: 8px 18px;
      font-size: 14px;
    }

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      border-radius: 99px;
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      border: none;
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary), #e60046);
      color: #fff;
      box-shadow: 0 4px 20px rgba(255, 42, 95, 0.4);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover), #ff2a5f);
      transform: translateY(-2px);
      box-shadow: 0 6px 24px rgba(255, 42, 95, 0.6);
    }

    .btn-outline {
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid var(--border-color);
      color: var(--text-main);
    }

    .btn-outline:hover {
      background: rgba(255, 255, 255, 0.1);
      border-color: var(--text-muted);
    }

    /* Sections */
    section {
      padding: 80px 0;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-surface);
    }

    .section-header {
      margin-bottom: 48px;
      max-width: 780px;
    }

    .section-header.center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }

    .badge-sub {
      display: inline-block;
      text-transform: uppercase;
      font-size: 12px;
      letter-spacing: 1px;
      font-weight: 700;
      color: var(--accent);
      background: var(--accent-glow);
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 34px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 16px;
      color: #fff;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* Hero (Video Website Style with Overlay & Play CTA) */
    .hero-section {
      position: relative;
      min-height: 640px;
      padding: 120px 0 100px;
      display: flex;
      align-items: center;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      overflow: hidden;
    }

    .hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: radial-gradient(circle at 70% 30%, rgba(255, 42, 95, 0.18), transparent 60%), linear-gradient(180deg, rgba(10, 11, 14, 0.6) 0%, #0a0b0e 100%);
      z-index: 1;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 860px;
    }

    .hero-content h1 {
      font-size: 46px;
      line-height: 1.2;
      font-weight: 900;
      margin-bottom: 22px;
      letter-spacing: -0.5px;
    }

    .hero-lead {
      font-size: 18px;
      color: #d1d5db;
      line-height: 1.8;
      margin-bottom: 34px;
      max-width: 740px;
    }

    .hero-btn-group {
      display: flex;
      gap: 18px;
      align-items: center;
      flex-wrap: wrap;
    }

    .play-trigger {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      padding: 12px 24px;
      background: rgba(255, 255, 255, 0.08);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 99px;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .play-trigger:hover {
      background: rgba(255, 255, 255, 0.18);
      border-color: #fff;
    }

    .play-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .play-icon svg {
      width: 14px;
      height: 14px;
      fill: #fff;
      margin-left: 2px;
    }

    /* Grid Layouts */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
      align-items: center;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 22px;
    }

    /* Card Systems */
    .card {
      background: var(--bg-surface-elevated);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
    }

    .card:hover {
      transform: translateY(-4px);
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .card-num {
      font-size: 28px;
      font-weight: 800;
      color: var(--accent);
      margin-bottom: 12px;
    }

    .card h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
      color: #fff;
    }

    .card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* Target Audience Cards (Who Fits / Who Doesn't) */
    .persona-card {
      padding: 36px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
    }

    .persona-card.fit {
      background: linear-gradient(180deg, rgba(0, 240, 255, 0.04) 0%, var(--bg-surface) 100%);
      border-color: rgba(0, 240, 255, 0.3);
    }

    .persona-card.not-fit {
      background: linear-gradient(180deg, rgba(255, 42, 95, 0.04) 0%, var(--bg-surface) 100%);
      border-color: rgba(255, 42, 95, 0.25);
    }

    .persona-card h3 {
      font-size: 22px;
      margin-bottom: 20px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .persona-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .persona-list li {
      position: relative;
      padding-left: 28px;
      font-size: 15px;
      color: var(--text-muted);
    }

    .persona-list li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 6px;
      width: 14px;
      height: 14px;
      border-radius: 50%;
    }

    .fit .persona-list li::before {
      background: var(--accent);
      box-shadow: 0 0 10px var(--accent);
    }

    .not-fit .persona-list li::before {
      background: var(--primary);
    }

    /* Comparison Table / Module */
    .compare-wrap {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
    }

    .compare-header {
      display: grid;
      grid-template-columns: 2fr 1.5fr 1.5fr;
      padding: 20px 28px;
      background: var(--bg-surface-elevated);
      font-weight: 700;
      font-size: 16px;
      border-bottom: 1px solid var(--border-color);
    }

    .compare-row {
      display: grid;
      grid-template-columns: 2fr 1.5fr 1.5fr;
      padding: 22px 28px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
      align-items: center;
    }

    .compare-row:last-child {
      border-bottom: none;
    }

    .compare-row .highlight {
      color: var(--accent);
      font-weight: 600;
    }

    /* News & Matrix Cards */
    .news-card {
      display: flex;
      flex-direction: column;
      background: var(--bg-surface-elevated);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
    }

    .news-card img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      border-radius: 0;
    }

    .news-body {
      padding: 24px;
      flex: 1;
    }

    .news-meta {
      font-size: 13px;
      color: var(--accent);
      margin-bottom: 10px;
    }

    .news-body h3 {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
      color: #fff;
    }

    .news-body p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Guarantees Bar */
    .guarantee-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      background: linear-gradient(135deg, #161822 0%, #1a1e2b 100%);
      padding: 36px 30px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
    }

    .guarantee-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
    }

    .guarantee-icon {
      font-size: 24px;
      color: var(--primary);
    }

    .guarantee-item h4 {
      font-size: 16px;
      margin-bottom: 6px;
      color: #fff;
    }

    .guarantee-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Footer */
    .site-footer {
      background: #08090b;
      padding: 60px 0 30px;
      border-top: 1px solid var(--border-color);
    }

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

    .footer-brand p {
      font-size: 14px;
      color: var(--text-muted);
      margin-top: 16px;
      line-height: 1.7;
      max-width: 440px;
    }

    .footer-col h4 {
      font-size: 16px;
      color: #fff;
      margin-bottom: 18px;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-col a {
      font-size: 14px;
      color: var(--text-muted);
    }

    .footer-col a:hover {
      color: var(--text-main);
    }

    .footer-bottom {
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      display: flex;
      justify-content: space-between;
      font-size: 13px;
      color: var(--text-sub);
    }

    /* Bottom Fixed CTA Bar */
    .sticky-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: rgba(18, 20, 26, 0.95);
      backdrop-filter: blur(14px);
      border-top: 1px solid var(--border-color);
      padding: 14px 0;
      z-index: 99;
      box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.5);
    }

    .sticky-bar-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .sticky-info {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .sticky-title {
      font-size: 16px;
      font-weight: 700;
      color: #fff;
    }

    .sticky-desc {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Responsive Breakpoints */
    @media (max-width: 1024px) {
      .hero-content h1 { font-size: 38px; }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .guarantee-bar { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .hero-section { min-height: 520px; padding: 80px 0 60px; }
      .hero-content h1 { font-size: 30px; }
      .hero-lead { font-size: 15px; }
      .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .compare-header, .compare-row { grid-template-columns: 1.5fr 1fr; }
      .compare-header > div:last-child, .compare-row > div:last-child { display: none; }
      .guarantee-bar { grid-template-columns: 1fr; }
      .footer-top { grid-template-columns: 1fr; }
      .sticky-desc { display: none; }
    }

    @media (max-width: 520px) {
      .hero-btn-group { flex-direction: column; align-items: stretch; }
      .btn { width: 100%; }
      .play-trigger { justify-content: center; }
      .nav-links { display: none; }
    }