/* roulang page: index */
:root {
      --color-black: #0B0B0B;
      --color-charcoal: #1A1A1A;
      --color-white: #FFFFFF;
      --color-light-gray: #F8F8F8;
      --color-mid-gray: #E0E0E0;
      --color-dark-gray: #333333;
      --color-gold: #D4AF37;
      --color-gold-soft: rgba(212, 175, 55, 0.15);
      --font-serif: 'Cinzel', 'Noto Serif SC', serif;
      --font-sans: 'Inter', 'PingFang SC', system-ui, -apple-system, sans-serif;
      --container-max: 1280px;
      --space-section: 120px;
      --radius-sm: 4px;
      --transition-smooth: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--color-white);
      color: var(--color-dark-gray);
      line-height: 1.7;
      font-weight: 400;
      font-size: 1rem;
      overflow-x: hidden;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 2rem;
    }

    /* 排版 */
    h1, h2, h3, .serif-title {
      font-family: var(--font-serif);
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--color-charcoal);
    }

    h2 {
      font-size: 2.8rem;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }

    .section-subtitle {
      font-family: var(--font-sans);
      font-weight: 300;
      font-size: 1.25rem;
      color: #555;
      max-width: 720px;
      margin-bottom: 3rem;
    }

    .gold-text {
      color: var(--color-gold);
    }

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

    /* 导航 */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.4s ease, backdrop-filter 0.4s ease, border-bottom 0.3s ease;
      background: transparent;
      padding: 1.25rem 0;
    }

    .main-header.scrolled {
      background: rgba(11, 11, 11, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--color-gold);
      padding: 0.9rem 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 2rem;
    }

    .logo {
      font-family: var(--font-serif);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--color-white);
      text-decoration: none;
      letter-spacing: 1px;
      transition: color 0.3s;
    }
    .main-header.scrolled .logo {
      color: var(--color-white);
    }
    .logo .gold-dot {
      color: var(--color-gold);
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }

    .nav-links a {
      font-family: var(--font-sans);
      font-weight: 400;
      font-size: 0.95rem;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: rgba(255,255,255,0.85);
      text-decoration: none;
      transition: color 0.3s, transform 0.2s;
      position: relative;
    }

    .nav-links a:hover {
      color: var(--color-gold);
      transform: translateX(2px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
      padding: 4px;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--color-white);
      transition: 0.3s;
    }
    .main-header.scrolled .hamburger span {
      background: var(--color-white);
    }

    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--color-black);
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 2.5rem;
      transform: translateY(-100%);
      transition: transform 0.4s ease-in-out;
      z-index: 999;
    }
    .mobile-menu.active {
      transform: translateY(0);
    }
    .mobile-menu a {
      font-family: var(--font-serif);
      font-size: 2.2rem;
      color: var(--color-white);
      text-decoration: none;
      font-weight: 600;
      transition: color 0.3s;
    }
    .mobile-menu a:hover {
      color: var(--color-gold);
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      display: flex;
      align-items: center;
      background-color: var(--color-charcoal);
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      overflow: hidden;
    }
    .hero::after {
      content: "";
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 20% 30%, rgba(212,175,55,0.12) 0%, rgba(11,11,11,0.7) 80%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      color: white;
    }
    .hero h1 {
      font-size: clamp(3rem, 7vw, 5.2rem);
      font-weight: 700;
      color: white;
      line-height: 1.1;
      margin-bottom: 1.5rem;
    }
    .hero h1 .gold-block {
      color: var(--color-gold);
      font-weight: 800;
    }
    .hero p {
      font-size: 1.25rem;
      font-weight: 300;
      max-width: 600px;
      margin-bottom: 2.5rem;
      color: rgba(255,255,255,0.8);
    }
    .btn-group {
      display: flex;
      gap: 1.25rem;
      flex-wrap: wrap;
    }
    .btn {
      display: inline-block;
      padding: 0.9rem 2.4rem;
      font-family: var(--font-sans);
      font-weight: 600;
      font-size: 0.95rem;
      text-transform: uppercase;
      letter-spacing: 1px;
      border: 1px solid transparent;
      text-decoration: none;
      transition: all var(--transition-smooth);
      cursor: pointer;
      background: transparent;
    }
    .btn-primary {
      background: var(--color-black);
      border-color: var(--color-gold);
      color: var(--color-gold);
    }
    .btn-primary:hover {
      background: var(--color-gold);
      color: var(--color-black);
      box-shadow: 4px 4px 0px var(--color-black);
      transform: translate(-2px, -2px);
    }
    .btn-outline {
      border-color: rgba(255,255,255,0.6);
      color: white;
    }
    .btn-outline:hover {
      background: white;
      color: var(--color-black);
      border-color: white;
      box-shadow: 4px 4px 0px var(--color-gold);
      transform: translate(-2px, -2px);
    }

    /* 通用板块 */
    section {
      padding: var(--space-section) 0;
    }
    .bg-light {
      background-color: var(--color-light-gray);
    }
    .bg-dark {
      background-color: var(--color-charcoal);
      color: white;
    }

    /* 痛点区 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      margin-top: 2rem;
    }
    .pain-item {
      border: 1px solid var(--color-mid-gray);
      padding: 2.5rem 2rem;
      background: white;
      transition: all var(--transition-smooth);
    }
    .pain-item:hover {
      border-color: var(--color-gold);
      transform: translateY(-6px);
      box-shadow: 6px 6px 0px rgba(0,0,0,0.05);
    }
    .pain-item h3 {
      font-family: var(--font-serif);
      font-size: 1.5rem;
      margin-bottom: 1rem;
    }

    /* 解决方案 不对称图文 */
    .solution-block {
      display: flex;
      align-items: center;
      gap: 4rem;
      margin-bottom: 5rem;
    }
    .solution-block.reverse {
      flex-direction: row-reverse;
    }
    .solution-text {
      flex: 1;
    }
    .solution-image {
      flex: 1;
      position: relative;
    }
    .solution-image img {
      width: 100%;
      height: auto;
      border-radius: var(--radius-sm);
      filter: grayscale(0.6);
      transition: filter 0.4s;
      border: 1px solid #eee;
    }
    .solution-image:hover img {
      filter: grayscale(0);
    }

    /* 数据区 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-serif);
      font-size: 4.5rem;
      font-weight: 800;
      color: var(--color-gold);
      line-height: 1;
    }

    /* 证言 */
    .testimonial-card {
      display: flex;
      gap: 2rem;
      align-items: flex-start;
      margin-bottom: 3rem;
    }
    .quote-mark {
      font-size: 5rem;
      color: var(--color-gold);
      line-height: 0.8;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--color-mid-gray);
      padding: 1.8rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }

    /* 联系方式 */
    .contact-wrapper {
      background: var(--color-black);
      padding: 4rem;
    }
    .contact-form input {
      width: 100%;
      background: transparent;
      border: none;
      border-bottom: 1px solid rgba(255,255,255,0.4);
      padding: 1rem 0;
      margin-bottom: 2rem;
      color: white;
    }
    .contact-form input:focus {
      outline: none;
      border-bottom-color: var(--color-gold);
    }

    footer {
      background: var(--color-black);
      color: #aaa;
      padding: 3rem 0;
      border-top: 2px solid var(--color-gold);
    }

    @media (max-width: 1024px) {
      .solution-block {
        flex-direction: column;
      }
      .pain-grid, .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .pain-grid, .stats-grid { grid-template-columns: 1fr; }
    }