/* roulang page: index */
:root {
      --deep-black: #1A1A1A;
      --milan-gold: #C8A96E;
      --milan-gold-dark: #B8934A;
      --warm-white: #FAFAFA;
      --pure-white: #FFFFFF;
      --power-red: #E63946;
      --success-green: #2A9D8F;
      --gray-border: #E5E5E5;
      --gray-text: #6B6B6B;
      --light-gray-bg: #F5F5F5;
      --font-title: 'Noto Sans SC', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.1);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 4px;
      --transition: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1.2);
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      background-color: var(--warm-white);
      color: var(--deep-black);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    /* 导航 */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background 0.3s, box-shadow 0.3s;
    }
    #header.scrolled {
      background: white;
      box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    .logo {
      font-family: var(--font-title);
      font-weight: 900;
      font-size: 1.8rem;
      color: var(--deep-black);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      letter-spacing: -0.5px;
    }
    .logo .gold-dot {
      width: 10px;
      height: 10px;
      background: var(--milan-gold);
      border-radius: 2px;
      transform: rotate(45deg);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      list-style: none;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--deep-black);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 4px;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--milan-gold);
      transition: width 0.3s;
    }
    .nav-links a:hover {
      color: var(--milan-gold);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .nav-cta {
      background: var(--milan-gold);
      color: var(--deep-black) !important;
      padding: 10px 20px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      text-decoration: none;
      transition: background 0.3s, transform 0.2s;
      margin-left: 8px;
    }
    .nav-cta:hover {
      background: var(--milan-gold-dark);
      transform: translateY(-2px);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      background: none;
      border: none;
      color: var(--deep-black);
      cursor: pointer;
    }
    /* 板块间距 */
    section {
      padding: 120px 0;
    }
    .section-title {
      font-family: var(--font-title);
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 1.5rem;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -12px;
      width: 60px;
      height: 3px;
      background: var(--milan-gold);
    }
    /* Hero */
    #hero {
      background: var(--deep-black);
      color: white;
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: 72px;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-content h1 {
      font-family: var(--font-title);
      font-size: 4rem;
      font-weight: 900;
      line-height: 1.1;
      margin-bottom: 1.2rem;
    }
    .hero-content .gold-line {
      width: 70px;
      height: 4px;
      background: var(--milan-gold);
      margin: 1.8rem 0;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: #d4d4d4;
      margin-bottom: 2.5rem;
      max-width: 480px;
    }
    .btn-group {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--milan-gold);
      color: var(--deep-black);
      font-weight: 700;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      text-decoration: none;
      border: none;
      cursor: pointer;
      transition: all 0.3s;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--milan-gold-dark);
      transform: translateY(-3px);
      box-shadow: 0 10px 25px rgba(200,169,110,0.4);
    }
    .btn-outline {
      border: 2px solid white;
      color: white;
      background: transparent;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: all 0.3s;
    }
    .btn-outline:hover {
      background: white;
      color: var(--deep-black);
    }
    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 20px;
      height: 450px;
      opacity: 0.9;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }
    /* KPI */
    #kpi {
      background: var(--deep-black);
      color: white;
    }
    .kpi-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 2rem;
      text-align: center;
    }
    .kpi-item .label {
      font-size: 0.9rem;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: #aaa;
    }
    .kpi-number {
      font-size: 3.5rem;
      font-weight: 700;
      color: var(--milan-gold);
      font-family: 'Inter', sans-serif;
      margin: 0.5rem 0;
    }
    .kpi-unit {
      color: var(--power-red);
      font-weight: 600;
    }
    /* 服务网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .service-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-card);
      border: 1px solid var(--gray-border);
      transition: all 0.3s;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      border-color: var(--milan-gold);
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: #f0f0f0;
      border-radius: 12px;
      margin-bottom: 1.5rem;
      background-image: url('/assets/images/coverpic/cover-1.webp');
      background-size: cover;
    }
    .service-card h3 {
      font-size: 1.5rem;
      margin-bottom: 0.8rem;
    }
    /* 对比 */
    .compare-wrapper {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 1rem;
      align-items: center;
    }
    .compare-left, .compare-right {
      background: white;
      padding: 40px;
      border-radius: var(--radius-card);
    }
    .compare-left {
      background: #f2f2f2;
    }
    .compare-right {
      border: 2px solid var(--milan-gold);
      position: relative;
    }
    .vs-badge {
      background: var(--milan-gold);
      color: black;
      font-weight: 900;
      width: 60px;
      height: 60px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      font-size: 1.5rem;
      z-index: 2;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid #ddd;
      padding: 1.2rem 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: #555;
    }
    /* 表单 */
    .contact-form {
      max-width: 600px;
      margin: 0 auto;
      background: white;
      padding: 48px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    .input-group input, .input-group textarea {
      width: 100%;
      border: none;
      border-bottom: 2px solid #ccc;
      padding: 12px 4px;
      font-size: 1rem;
      transition: border 0.3s;
      background: transparent;
    }
    .input-group input:focus, .input-group textarea:focus {
      border-bottom-color: var(--milan-gold);
      outline: none;
    }
    footer {
      background: var(--deep-black);
      color: #aaa;
      padding: 60px 0;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .hero-visual { height: 300px; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .services-grid { grid-template-columns: 1fr 1fr; }
      .kpi-grid { grid-template-columns: 1fr 1fr; }
      .compare-wrapper { grid-template-columns: 1fr; }
      .vs-badge { margin: 1rem auto; }
    }
    @media (max-width: 520px) {
      .services-grid, .kpi-grid { grid-template-columns: 1fr; }
      .hero-content h1 { font-size: 2.8rem; }
    }