/* roulang page: index */
:root {
      --primary-deep: #0B1A2E;
      --bg-even: #0F2137;
      --nav-bg: #091525;
      --gold: #D49B3E;
      --silver: #A8B7C6;
      --teal: #1FA38B;
      --coral: #C25A4A;
      --white: #FFFFFF;
      --text-body: #B0BEC5;
      --text-light: #CFD8DC;
      --card-bg: rgba(255, 255, 255, 0.03);
      --card-border: rgba(168, 183, 198, 0.15);
      --card-hover-border: rgba(168, 183, 198, 0.35);
      --card-hover-bg: rgba(255, 255, 255, 0.06);
      --radius-card: 16px;
      --radius-btn: 10px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --font-inter: 'Inter', sans-serif;
      --font-noto: 'Noto Sans SC', sans-serif;
      --transition: 300ms ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-noto);
      background-color: var(--primary-deep);
      color: var(--text-body);
      line-height: 1.75;
      font-weight: 300;
      display: flex;
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }
    /* 左侧导航 App Shell */
    .app-nav {
      position: fixed;
      left: 0;
      top: 0;
      width: 240px;
      height: 100vh;
      background-color: var(--nav-bg);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 40px 24px 24px;
      border-right: 1px solid rgba(168, 183, 198, 0.1);
      z-index: 1000;
      transition: transform 0.3s ease;
    }
    .nav-brand {
      margin-bottom: 48px;
    }
    .logo-text {
      font-family: var(--font-inter);
      font-weight: 700;
      font-size: 28px;
      color: var(--gold);
      letter-spacing: 1px;
      display: block;
      line-height: 1.2;
    }
    .logo-domain {
      font-size: 10px;
      color: var(--silver);
      font-family: var(--font-inter);
      letter-spacing: 0.5px;
      opacity: 0.8;
    }
    .nav-links {
      list-style: none;
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .nav-links li a {
      display: block;
      font-family: var(--font-noto);
      font-weight: 400;
      font-size: 15px;
      color: var(--silver);
      text-decoration: none;
      padding: 8px 12px;
      border-left: 3px solid transparent;
      transition: all var(--transition);
      border-radius: 0 4px 4px 0;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--gold);
      border-left-color: var(--gold);
      background: rgba(212, 155, 62, 0.05);
    }
    .nav-footer {
      margin-top: auto;
      font-size: 12px;
      color: var(--silver);
      opacity: 0.7;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .lang-placeholder {
      background: transparent;
      border: 1px solid var(--silver);
      color: var(--silver);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      text-align: center;
      width: fit-content;
      cursor: default;
    }
    /* 主内容区域 */
    .main-content {
      margin-left: 240px;
      width: calc(100% - 240px);
      max-width: 1440px;
      padding: 0 40px;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
    }
    section {
      padding: 120px 0;
    }
    .section-even {
      background-color: var(--bg-even);
      margin-left: -40px;
      margin-right: -40px;
      padding-left: 40px;
      padding-right: 40px;
    }
    h1, h2, h3 {
      color: var(--white);
      font-weight: 500;
    }
    h1 {
      font-family: var(--font-inter);
      font-weight: 700;
      font-size: 52px;
      line-height: 1.15;
      margin-bottom: 24px;
    }
    h2 {
      font-family: var(--font-noto);
      font-weight: 500;
      font-size: 36px;
      line-height: 1.3;
      margin-bottom: 32px;
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60%;
      height: 2px;
      background: var(--gold);
      opacity: 0.4;
    }
    h3 {
      font-family: var(--font-noto);
      font-weight: 500;
      font-size: 20px;
      line-height: 1.4;
      margin-bottom: 12px;
      color: var(--white);
    }
    p {
      color: var(--text-body);
      font-weight: 300;
      font-size: 16px;
      line-height: 1.75;
    }
    .btn {
      display: inline-block;
      font-family: var(--font-noto);
      font-weight: 700;
      border-radius: var(--radius-btn);
      text-decoration: none;
      transition: all 0.25s ease-out;
      cursor: pointer;
      border: none;
      text-align: center;
    }
    .btn-primary {
      background: var(--gold);
      color: var(--primary-deep);
      padding: 14px 36px;
      box-shadow: 0 0 24px rgba(212, 155, 62, 0.5), 0 0 60px rgba(212, 155, 62, 0.2);
      font-size: 16px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 36px rgba(212, 155, 62, 0.7);
      transform: scale(1.04);
    }
    .btn-secondary {
      background: transparent;
      border: 1.5px solid var(--gold);
      color: var(--gold);
      padding: 12px 32px;
      font-weight: 500;
    }
    .btn-secondary:hover {
      background: rgba(212, 155, 62, 0.15);
    }
    .btn-large {
      padding: 18px 48px;
      font-size: 18px;
    }
    .glass-card {
      background: var(--card-bg);
      border: 1px solid var(--card-border);
      backdrop-filter: blur(18px);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-card);
      transition: all var(--transition);
    }
    .glass-card:hover {
      border-color: var(--card-hover-border);
      background: var(--card-hover-bg);
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: rgba(212, 155, 62, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--gold);
      font-size: 24px;
      margin-bottom: 20px;
    }
    .text-gold {
      color: var(--gold);
    }
    .text-silver {
      color: var(--silver);
    }
    .mt-16 { margin-top: 16px; }
    .mb-24 { margin-bottom: 24px; }
    .text-center { text-align: center; }
    /* 移动端导航按钮 */
    .mobile-nav-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--gold);
      font-size: 28px;
      cursor: pointer;
      position: fixed;
      top: 12px;
      left: 12px;
      z-index: 1100;
      background: var(--nav-bg);
      padding: 8px 12px;
      border-radius: 8px;
    }
    @media (max-width: 1024px) {
      .app-nav {
        transform: translateX(-100%);
      }
      .app-nav.open {
        transform: translateX(0);
        box-shadow: 8px 0 24px rgba(0,0,0,0.5);
      }
      .main-content {
        margin-left: 0;
        width: 100%;
        padding: 0 20px;
      }
      .mobile-nav-toggle {
        display: block;
      }
      section {
        padding: 80px 0;
      }
      .section-even {
        margin-left: -20px;
        margin-right: -20px;
        padding-left: 20px;
        padding-right: 20px;
      }
      h1 {
        font-size: 40px;
      }
      h2 {
        font-size: 30px;
      }
    }
    @media (max-width: 768px) {
      .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
      h1 {
        font-size: 34px;
      }
      h2 {
        font-size: 26px;
      }
      .btn-primary {
        width: 100%;
        padding: 16px;
      }
      .process-steps {
        flex-direction: column;
        align-items: flex-start;
      }
      .hero-content {
        padding-top: 80px;
      }
    }
    /* 流程箭头 */
    .process-steps {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .step-item {
      text-align: center;
      flex: 1;
    }
    .step-number {
      width: 48px;
      height: 48px;
      background: var(--gold);
      color: var(--primary-deep);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-family: var(--font-inter);
      font-weight: 700;
      font-size: 22px;
      margin: 0 auto 16px;
    }
    .step-connector {
      color: var(--gold);
      font-size: 24px;
      margin: 0 8px;
      opacity: 0.7;
    }
    @media (max-width: 768px) {
      .process-steps {
        flex-direction: column;
        gap: 24px;
      }
      .step-connector {
        transform: rotate(90deg);
        margin: 8px 0;
      }
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid rgba(168,183,198,0.2);
      margin-bottom: 8px;
    }
    .faq-question {
      background: rgba(255,255,255,0.02);
      padding: 18px 16px;
      width: 100%;
      text-align: left;
      border: none;
      color: var(--white);
      font-family: var(--font-noto);
      font-weight: 500;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: background var(--transition);
    }
    .faq-question:hover {
      background: rgba(255,255,255,0.05);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: rgba(255,255,255,0.02);
      padding: 0 16px;
      color: var(--silver);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }
    .faq-icon {
      font-size: 20px;
      color: var(--gold);
    }
    /* 图片样式 */
    .card-img {
      width: 100%;
      height: 160px;
      object-fit: cover;
      border-radius: 16px 16px 0 0;
      margin: -28px -28px 20px -28px;
      width: calc(100% + 56px);
    }
    .avatar-placeholder {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      background-color: #2a3a4a;
      margin-right: 16px;
      background-size: cover;
    }
    footer a {
      color: var(--silver);
      text-decoration: none;
      transition: color 0.2s;
    }
    footer a:hover {
      color: var(--gold);
    }