/* roulang page: index */
:root {
      --color-primary: #3A2C2B;
      --color-primary-light: #5F4B3A;
      --color-accent: #C9A96E;
      --color-accent-hover: #B8934A;
      --color-bg: #F5F0E8;
      --color-card: #F9F7F3;
      --color-tag: #2E5A4B;
      --color-text: #1A1A1A;
      --color-muted: #6B6B6B;
      --color-white: #ffffff;
      --color-border: rgba(58,44,43,0.12);
      --color-shadow: rgba(58,44,43,0.08);
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Noto Sans SC', 'Inter', 'Helvetica Neue', sans-serif;
      --font-display: 'Playfair Display', 'Noto Serif SC', serif;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-xl: 30px;
      --radius-full: 40px;
      --transition: 0.3s ease;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--color-bg);
      color: var(--color-text);
      line-height: 1.8;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 700;
      color: var(--color-primary);
      margin-bottom: 0.5rem;
    }

    h1 { font-size: 42px; line-height: 1.2; }
    h2 { font-size: 32px; line-height: 1.3; }
    h3 { font-size: 24px; line-height: 1.4; }

    p {
      color: var(--color-muted);
      margin-bottom: 1rem;
    }

    a {
      color: var(--color-primary);
      text-decoration: none;
      transition: var(--transition);
    }

    a:hover {
      color: var(--color-accent-hover);
    }

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 悬浮胶囊导航 */
    .main-nav {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: auto;
      max-width: 650px;
      z-index: 999;
      background: rgba(249, 247, 243, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-radius: var(--radius-full);
      padding: 0.5rem 1.5rem;
      box-shadow: 0 10px 25px rgba(58,44,43,0.12);
      border: 1px solid rgba(201,169,110,0.3);
    }

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

    .logo {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--color-primary);
      letter-spacing: 1px;
      background: linear-gradient(135deg, #3A2C2B 0%, #5F4B3A 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo i {
      background: none;
      -webkit-text-fill-color: var(--color-accent);
      font-size: 1.6rem;
    }

    .nav-links {
      display: flex;
      list-style: none;
      gap: 1.5rem;
      margin: 0;
    }

    .nav-links a {
      font-weight: 500;
      color: var(--color-primary);
      font-size: 0.95rem;
      padding: 0.3rem 0;
      position: relative;
      white-space: nowrap;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--color-accent);
      transition: width 0.25s ease;
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--color-primary);
      cursor: pointer;
    }

    /* 按钮 */
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-xl);
      padding: 0.8rem 2rem;
      transition: all var(--transition);
      font-size: 0.95rem;
      letter-spacing: 0.3px;
      border: 2px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: var(--color-accent);
      color: var(--color-primary);
      border-color: var(--color-accent);
      box-shadow: 0 6px 18px rgba(201,169,110,0.35);
    }

    .btn-primary:hover {
      background: var(--color-accent-hover);
      border-color: var(--color-accent-hover);
      color: #2E2423;
      transform: translateY(-2px);
    }

    .btn-outline {
      background: transparent;
      border-color: var(--color-accent);
      color: var(--color-primary);
    }

    .btn-outline:hover {
      background: rgba(201,169,110,0.15);
      border-color: var(--color-accent-hover);
      color: var(--color-primary);
    }

    .btn-link {
      color: var(--color-primary);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      border-bottom: 1px solid var(--color-accent);
      padding-bottom: 2px;
    }

    .section {
      padding: 80px 0;
    }

    .section-title {
      margin-bottom: 2.5rem;
      position: relative;
    }

    .section-title small {
      display: block;
      font-family: var(--font-sans);
      color: var(--color-accent);
      font-weight: 500;
      letter-spacing: 2px;
      text-transform: uppercase;
      font-size: 0.9rem;
    }

    .bg-dark {
      background: var(--color-primary);
    }

    .card {
      background: var(--color-card);
      border-radius: var(--radius-md);
      padding: 2rem;
      box-shadow: 0 4px 20px var(--color-shadow);
      transition: all var(--transition);
      border: 1px solid rgba(201,169,110,0.15);
    }

    .card:hover {
      transform: translateY(-6px);
      box-shadow: 0 18px 30px rgba(58,44,43,0.15);
    }

    .tag {
      background: var(--color-tag);
      color: white;
      font-size: 0.8rem;
      font-weight: 600;
      padding: 0.2rem 0.9rem;
      border-radius: 20px;
      display: inline-block;
      letter-spacing: 0.4px;
    }

    .footer {
      background: #2E2423;
      color: rgba(255,255,255,0.8);
      padding: 3rem 0 1.5rem;
    }

    .footer a {
      color: rgba(255,255,255,0.75);
    }

    .footer a:hover {
      color: var(--color-accent);
    }

    @media (max-width: 1024px) {
      h1 { font-size: 36px; }
      h2 { font-size: 28px; }
    }

    @media (max-width: 768px) {
      .main-nav {
        width: 92%;
        left: 4%;
        transform: none;
        max-width: 100%;
        border-radius: 50px;
        padding: 0.5rem 1.2rem;
      }

      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(249,247,243,0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 1.5rem;
        border-radius: 30px;
        gap: 1rem;
        box-shadow: 0 20px 30px rgba(0,0,0,0.1);
      }

      .nav-links.active {
        display: flex;
      }

      .hamburger {
        display: block;
      }

      h1 { font-size: 32px; }
      h2 { font-size: 26px; }
      .section { padding: 60px 0; }
    }