/* roulang page: index */
/* ===== 设计变量与全局重置 ===== */
    :root {
      --deep-charcoal: #1E1E1E;
      --champagne-gold: #C9A96E;
      --warm-sand: #F5F0E8;
      --matte-copper: #B8863C;
      --bg-start: #FAF8F5;
      --bg-end: #FFFFFF;
      --text-primary: #1E1E1E;
      --text-secondary: #5A554F;
      --text-muted: #8A8580;
      --border-light: rgba(201, 169, 110, 0.18);
      --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.04);
      --shadow-card-hover: 0 16px 36px rgba(0, 0, 0, 0.08);
      --radius-card: 20px;
      --radius-button: 40px;
      --radius-input: 12px;
      --font-serif: 'Noto Serif SC', 'Times New Roman', serif;
      --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      --font-mono: 'DM Mono', 'Courier New', monospace;
      --section-padding: 100px;
      --card-padding: 32px;
      --nav-height: 64px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-primary);
      background: linear-gradient(180deg, var(--bg-start) 0%, var(--bg-end) 100%);
      background-attachment: fixed;
      -webkit-font-smoothing: antialiased;
    }

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

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

    h1, h2, h3, h4 {
      font-family: var(--font-serif);
      font-weight: 700;
      margin-top: 0;
    }

    h2 {
      font-size: 2.4rem;
      letter-spacing: -0.5px;
      margin-bottom: 1.2rem;
      color: var(--deep-charcoal);
    }

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

    .section-title p {
      font-family: var(--font-sans);
      font-size: 1.1rem;
      color: var(--text-secondary);
      max-width: 640px;
      margin: 0 auto;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* ===== 导航栏 (分屏Hero联动) ===== */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 40;
      height: var(--nav-height);
      background: rgba(250, 248, 245, 0.7);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(201, 169, 110, 0.15);
      transition: background 0.3s ease, box-shadow 0.3s ease;
    }

    .site-header.scrolled {
      background: rgba(250, 248, 245, 0.9);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      font-family: var(--font-serif);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--champagne-gold);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
      line-height: 1;
    }
    .logo i {
      font-size: 1.8rem;
      color: var(--matte-copper);
    }

    .nav-links {
      display: flex;
      gap: 2rem;
      list-style: none;
      margin: 0;
      font-weight: 500;
      color: var(--text-secondary);
    }

    .nav-links a {
      font-size: 0.95rem;
      padding: 0.3rem 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--champagne-gold);
      border-bottom-color: var(--champagne-gold);
    }

    .nav-cta {
      background: linear-gradient(135deg, #C9A96E 0%, #B8965A 100%);
      color: white !important;
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-button);
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 4px 12px rgba(201,169,110,0.25);
      transition: filter 0.2s, box-shadow 0.2s;
    }
    .nav-cta:hover {
      filter: brightness(1.1);
      box-shadow: 0 8px 18px rgba(201,169,110,0.35);
    }

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

    /* 移动端导航 */
    @media screen and (max-width: 840px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: rgba(30,30,30,0.95);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2.5rem;
        transition: right 0.35s ease;
        font-size: 1.5rem;
        color: white;
        z-index: 50;
      }
      .nav-links.active {
        right: 0;
      }
      .nav-links a {
        color: white;
        border-bottom: none;
      }
      .nav-links a:hover {
        color: var(--champagne-gold);
      }
      .hamburger {
        display: block;
        z-index: 55;
      }
      .nav-cta {
        background: var(--champagne-gold);
        color: #1E1E1E !important;
      }
    }

    /* ===== Hero 分屏布局 ===== */
    .hero-section {
      display: flex;
      min-height: 100vh;
      padding-top: var(--nav-height);
      background: var(--bg-start);
    }

    .hero-left {
      width: 45%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 2rem 3rem 2rem 5%;
      background: transparent;
    }

    .hero-right {
      width: 55%;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(30,30,30,0.25) 0%, rgba(184,134,60,0.25) 100%);
    }

    .hero-badge {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(8px);
      padding: 1rem 2rem;
      border-radius: 60px;
      font-family: var(--font-mono);
      font-weight: 500;
      color: var(--matte-copper);
      box-shadow: 0 12px 28px rgba(0,0,0,0.1);
      z-index: 2;
      font-size: 1.2rem;
    }

    .hero-left h1 {
      font-size: 3.5rem;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      color: var(--deep-charcoal);
    }

    .hero-left .subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 2rem;
      max-width: 90%;
    }

    .btn-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, #C9A96E 0%, #B8965A 100%);
      color: white;
      padding: 0.9rem 2.3rem;
      border-radius: var(--radius-button);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: filter 0.2s, box-shadow 0.2s;
      box-shadow: 0 6px 16px rgba(201,169,110,0.3);
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 10px 22px rgba(201,169,110,0.4);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--champagne-gold);
      color: var(--champagne-gold);
      padding: 0.9rem 2.3rem;
      border-radius: var(--radius-button);
      font-weight: 600;
      transition: all 0.25s;
    }
    .btn-outline:hover {
      background: rgba(201,169,110,0.08);
    }

    @media screen and (max-width: 840px) {
      .hero-section {
        flex-direction: column;
      }
      .hero-left, .hero-right {
        width: 100%;
      }
      .hero-right {
        height: 50vh;
        order: -1;
      }
      .hero-left {
        padding: 2.5rem 1.5rem;
      }
      .hero-left h1 {
        font-size: 2.5rem;
      }
    }

    /* ===== 通用板块 ===== */
    section {
      padding: var(--section-padding) 0;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .card {
      background: var(--warm-sand);
      border-radius: var(--radius-card);
      padding: var(--card-padding);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
      transition: box-shadow 0.3s, border-color 0.3s;
    }
    .card:hover {
      box-shadow: var(--shadow-card-hover);
      border-color: rgba(201,169,110,0.35);
    }

    .badge-copper {
      background: var(--matte-copper);
      color: white;
      font-family: var(--font-mono);
      padding: 0.3rem 1rem;
      border-radius: 30px;
      font-size: 0.9rem;
      display: inline-block;
      margin-top: 1rem;
    }

    @media screen and (max-width: 840px) {
      .grid-3 {
        grid-template-columns: 1fr;
      }
      section {
        padding: 60px 0;
      }
    }

    /* 痛点区 */
    .pain-list {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
      justify-content: center;
    }
    .pain-item {
      flex: 1 1 250px;
      background: white;
      border-radius: 24px;
      padding: 2rem;
      box-shadow: 0 4px 18px rgba(0,0,0,0.03);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #e5dfd5;
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 1rem;
    }

    /* 页脚 */
    .footer {
      background: var(--deep-charcoal);
      color: #ccc;
      padding: 3rem 0 1.5rem;
    }
    .footer a {
      color: var(--champagne-gold);
    }