/* roulang page: index */
:root {
      --color-primary: #C84B0E;
      --color-primary-hover: #E55D1A;
      --color-gold: #F3D452;
      --color-bg-deep: #1A1410;
      --color-bg-card: rgba(28, 20, 15, 0.75);
      --color-text-body: #D6C8B8;
      --color-text-muted: #9B8A7A;
      --color-text-white: #FFFFFF;
      --color-border-gold: rgba(243, 212, 82, 0.25);
      --color-border-copper: rgba(200, 75, 14, 0.3);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-hero-btn: 20px;
      --shadow-card: 0 8px 32px rgba(200, 75, 14, 0.18);
      --shadow-card-hover: 0 16px 48px rgba(243, 212, 82, 0.25);
      --font-heading: 'ZCOOL XiaoWei', '思源宋体 CN Heavy', serif;
      --font-body: 'Noto Sans SC', '阿里巴巴普惠体', sans-serif;
      --font-display: 'Bebas Neue', 'Oswald', sans-serif;
      --section-gap: 100px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      margin: 0;
      font-family: var(--font-body);
      background-color: var(--color-bg-deep);
      color: var(--color-text-body);
      line-height: 1.6;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, .font-heading {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: 0.02em;
    }
    .display-number {
      font-family: var(--font-display);
      letter-spacing: 0.04em;
    }
    a {
      text-decoration: none;
      transition: color 0.25s;
      color: var(--color-gold);
    }
    a:hover {
      color: var(--color-primary-hover);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container-custom {
      max-width: 1280px;
      margin: 0 auto;
      padding-left: 24px;
      padding-right: 24px;
    }
    /* 导航 */
    #navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1050;
      background: transparent;
      transition: background 0.3s, backdrop-filter 0.3s;
      padding: 16px 0;
    }
    #navbar.scrolled {
      background: rgba(26, 20, 16, 0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.5);
    }
    .navbar-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo {
      font-family: var(--font-heading);
      font-size: 1.9rem;
      color: var(--color-gold);
      letter-spacing: 2px;
      white-space: nowrap;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--color-text-body);
      font-weight: 500;
      font-size: 0.95rem;
      padding-bottom: 4px;
      border-bottom: 2px solid transparent;
      transition: 0.2s;
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--color-primary);
      transition: width 0.25s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--color-gold);
    }
    .nav-links a.active::after,
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-divider {
      width: 1px;
      height: 20px;
      background: var(--color-text-muted);
      opacity: 0.5;
    }
    .menu-toggle {
      background: none;
      border: none;
      color: var(--color-gold);
      font-size: 1.8rem;
      display: none;
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(26,20,16,0.96);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 32px 24px;
        gap: 24px;
        border-top: 1px solid var(--color-border-copper);
      }
      .nav-links.show {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .nav-divider {
        display: none;
      }
    }
    /* Hero */
    #hero {
      min-height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
    }
    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, transparent 20%, #1A1410 90%);
      opacity: 0.85;
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      margin-left: 8%;
      color: white;
    }
    .hero-content h1 {
      font-size: clamp(2.8rem, 6vw, 5rem);
      color: var(--color-gold);
      line-height: 1.2;
      margin-bottom: 1.2rem;
      text-shadow: 0 4px 20px rgba(0,0,0,0.6);
    }
    .hero-sub {
      font-size: 1.3rem;
      color: var(--color-text-body);
      margin-bottom: 2.5rem;
    }
    .hero-buttons {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .btn-primary-custom {
      background: var(--color-primary);
      border: none;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-hero-btn);
      font-weight: 600;
      font-size: 1.1rem;
      box-shadow: 0 0 18px rgba(200,75,14,0.6);
      transition: all 0.28s cubic-bezier(0.25, 0.8, 0.25, 1.2);
      display: inline-block;
      text-align: center;
    }
    .btn-primary-custom:hover {
      background: var(--color-primary-hover);
      box-shadow: 0 0 28px rgba(243, 212, 82, 0.5);
      color: white;
      transform: translateY(-3px);
    }
    .btn-outline-gold {
      background: transparent;
      border: 2px solid var(--color-gold);
      color: var(--color-gold);
      padding: 14px 36px;
      border-radius: var(--radius-hero-btn);
      font-weight: 600;
      font-size: 1.1rem;
      transition: all 0.28s ease;
      display: inline-block;
    }
    .btn-outline-gold:hover {
      background: rgba(243,212,82,0.12);
      color: var(--color-gold);
      border-color: #ffe484;
    }
    .floating-shard {
      position: absolute;
      right: 8%;
      top: 25%;
      width: 180px;
      height: 180px;
      border: 2px solid rgba(200,75,14,0.4);
      transform: rotate(15deg);
      animation: floatRotate 10s infinite alternate;
      backdrop-filter: blur(6px);
      display: none;
    }
    @media (min-width: 992px) {
      .floating-shard {
        display: block;
      }
    }
    @keyframes floatRotate {
      0% { transform: rotate(5deg) translateY(0); }
      100% { transform: rotate(20deg) translateY(-20px); }
    }
    /* 通用区块 */
    section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 3.5rem;
    }
    .section-title h2 {
      font-size: 2.5rem;
      color: var(--color-gold);
      margin-bottom: 0.4rem;
    }
    .section-title .decor {
      font-family: var(--font-display);
      color: var(--color-text-muted);
      font-size: 1rem;
      letter-spacing: 3px;
      text-transform: uppercase;
    }
    /* Arena 卡片 */
    .arena-grid {
      display: flex;
      gap: 28px;
      justify-content: center;
      flex-wrap: wrap;
      align-items: flex-start;
    }
    .arena-card {
      background: var(--color-bg-card);
      backdrop-filter: blur(18px);
      border: 1px solid var(--color-border-gold);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      flex: 1 1 260px;
      max-width: 320px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
      position: relative;
    }
    .arena-card:nth-child(2) {
      transform: translateY(-14px);
    }
    .arena-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-card-hover);
      border-color: var(--color-primary);
    }
    .arena-icon {
      font-size: 2.8rem;
      color: var(--color-gold);
      margin-bottom: 20px;
    }
    .arena-card h3 {
      color: white;
      font-size: 1.6rem;
      margin-bottom: 12px;
    }
    .arena-card p {
      color: var(--color-text-body);
      margin-bottom: 16px;
    }
    .card-line {
      width: 50px;
      height: 2px;
      background: linear-gradient(90deg, var(--color-primary), transparent);
      margin-top: 12px;
    }
    /* Stats */
    .stats-row {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 24px;
      background: rgba(20, 15, 10, 0.7);
      backdrop-filter: blur(10px);
      padding: 48px 24px;
      border-radius: var(--radius-card);
      border: 1px solid var(--color-border-copper);
    }
    .stat-item {
      text-align: center;
      flex: 1 1 160px;
    }
    .stat-number {
      font-size: 3.5rem;
      color: var(--color-gold);
      font-family: var(--font-display);
      line-height: 1;
    }
    .stat-label {
      color: var(--color-text-muted);
      margin-top: 10px;
    }
    /* Showcase */
    .showcase-item {
      display: flex;
      align-items: center;
      gap: 40px;
      margin-bottom: 60px;
      flex-wrap: wrap;
    }
    .showcase-item.reverse {
      flex-direction: row-reverse;
    }
    .showcase-text {
      flex: 1 1 45%;
    }
    .showcase-text h3 {
      color: white;
      font-size: 2rem;
      margin-bottom: 16px;
    }
    .showcase-img {
      flex: 1 1 45%;
      border-radius: var(--radius-card);
      overflow: hidden;
      border: 1px solid rgba(243,212,82,0.2);
      transition: transform 0.3s;
    }
    .showcase-img:hover {
      transform: scale(1.03);
    }
    .showcase-img img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    /* Roadmap */
    .timeline {
      position: relative;
      padding-left: 40px;
    }
    .timeline::before {
      content: '';
      position: absolute;
      left: 15px;
      top: 0;
      bottom: 0;
      width: 2px;
      background: linear-gradient(to bottom, var(--color-primary), transparent);
    }
    .timeline-item {
      position: relative;
      margin-bottom: 40px;
      padding-left: 30px;
    }
    .timeline-dot {
      position: absolute;
      left: -7px;
      top: 5px;
      width: 16px;
      height: 16px;
      background: var(--color-gold);
      border-radius: 50%;
      box-shadow: 0 0 15px var(--color-gold);
    }
    .timeline-content h4 {
      color: white;
      font-size: 1.5rem;
      margin-bottom: 8px;
    }
    /* FAQ */
    .accordion-button {
      background: rgba(28,20,15,0.8);
      color: var(--color-text-body);
      font-weight: 500;
      border: none;
      border-left: 3px solid transparent;
      transition: 0.2s;
      padding: 18px 20px;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(40, 28, 20, 0.9);
      color: white;
      border-left: 3px solid var(--color-primary);
      box-shadow: none;
    }
    .accordion-button::after {
      filter: brightness(0) invert(1);
    }
    .accordion-body {
      background: rgba(20,15,10,0.7);
      color: var(--color-text-body);
      line-height: 1.8;
    }
    /* CTA */
    #cta {
      background: #0F0B08;
      text-align: center;
      padding: 80px 24px;
    }
    .cta-title {
      font-size: 2.5rem;
      color: white;
      margin-bottom: 24px;
    }
    .urgency {
      color: var(--color-text-muted);
      margin-top: 20px;
    }
    /* Footer */
    footer {
      background: #1A1410;
      color: var(--color-text-muted);
      padding: 60px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-logo {
      font-family: var(--font-heading);
      color: var(--color-gold);
      font-size: 1.8rem;
    }
    .social-icons i {
      font-size: 1.5rem;
      margin-right: 16px;
      color: var(--color-text-muted);
      transition: 0.2s;
    }
    .social-icons i:hover {
      color: var(--color-gold);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-content {
        margin-left: 5%;
      }
      .arena-card:nth-child(2) {
        transform: none;
      }
      section {
        padding: 60px 0;
      }
    }