/* roulang page: index */
:root {
      --primary: #1E3A3F;
      --primary-deep: #15262A;
      --accent: #C49A6C;
      --accent-light: rgba(196, 154, 108, 0.2);
      --bg-white: #FFFFFF;
      --bg-warm: #F7F5F2;
      --text-main: #1A1A1A;
      --text-secondary: #5C5C5C;
      --text-muted: #8A8A8A;
      --border-light: #E5E5E5;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.06);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-serif: Georgia, "Times New Roman", serif;
      --radius-card: 12px;
      --radius-btn: 50px;
      --radius-input: 8px;
      --transition: all 0.25s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-white);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
      color: var(--primary);
    }

    h1 {
      font-size: 3.2rem;
      max-width: 700px;
    }

    h2 {
      font-size: 2rem;
      margin-bottom: 2.5rem;
    }

    .container {
      max-width: 1140px;
    }

    p {
      max-width: 680px;
      color: var(--text-secondary);
      line-height: 1.8;
    }

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

    a:hover {
      color: var(--accent);
      text-decoration: underline;
      text-underline-offset: 2px;
    }

    .btn {
      font-weight: 500;
      letter-spacing: 0.02em;
      border-radius: var(--radius-btn);
      padding: 0.7rem 2rem;
      transition: var(--transition);
      border: none;
    }

    .btn-primary {
      background-color: var(--accent);
      color: #fff;
    }

    .btn-primary:hover {
      background-color: #b0895a;
      box-shadow: 0 0 0 4px var(--accent-light);
      color: #fff;
    }

    .btn-outline-primary {
      background: transparent;
      color: var(--primary);
      border: 1px solid var(--primary);
    }

    .btn-outline-primary:hover {
      background-color: rgba(30, 58, 63, 0.05);
      color: var(--primary);
      border-color: var(--primary);
    }

    .btn-light-white {
      background: #fff;
      color: var(--primary);
    }

    .btn-light-white:hover {
      background: #f0f0f0;
      color: var(--primary);
    }

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

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

    .section {
      padding: 4rem 0;
    }

    @media (max-width: 992px) {
      h1 {
        font-size: 2.3rem;
      }
      h2 {
        font-size: 1.7rem;
      }
      .section {
        padding: 3rem 0;
      }
    }

    /* 导航 */
    .navbar {
      height: 72px;
      background: rgba(255, 255, 255, 0.9);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: var(--transition);
      padding: 0 1rem;
    }

    .navbar.scrolled {
      height: 60px;
      background: rgba(255, 255, 255, 0.92);
      box-shadow: 0 1px 0 rgba(0,0,0,0.05);
      border-bottom: 1px solid var(--border-light);
    }

    .navbar-brand {
      font-weight: 700;
      font-size: 1.4rem;
      color: var(--primary) !important;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .logo-icon {
      width: 20px;
      height: 20px;
      background: var(--accent);
      transform: rotate(45deg);
      display: inline-block;
    }

    .nav-link {
      font-weight: 500;
      color: #4A4A4A !important;
      margin: 0 0.5rem;
      position: relative;
      transition: var(--transition);
    }

    .nav-link:hover, .nav-link.active {
      color: var(--primary) !important;
    }

    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent);
    }

    .search-box {
      background: #F2F2F2;
      border: none;
      border-radius: var(--radius-input);
      padding: 0.4rem 1rem;
      width: 180px;
      transition: var(--transition);
    }

    .search-box:focus {
      background: #fff;
      outline: none;
      box-shadow: 0 0 0 2px var(--accent);
    }

    .navbar .btn-primary {
      padding: 0.5rem 1.5rem;
      font-size: 0.9rem;
    }

    @media (max-width: 992px) {
      .navbar .search-box, .navbar .icon-link {
        display: none;
      }
      .navbar-nav {
        background: white;
        padding: 1rem;
        border-radius: 8px;
        box-shadow: var(--shadow-hover);
      }
    }

    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: var(--bg-white);
      padding-top: 72px;
    }

    .hero-graphic {
      position: relative;
      width: 100%;
      height: 400px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      opacity: 0.9;
      animation: floatSlow 8s infinite alternate ease-in-out;
    }

    @keyframes floatSlow {
      0% { transform: translateY(0px); }
      100% { transform: translateY(-15px); }
    }

    /* 卡片通用 */
    .feature-card, .service-card, .case-card, .testimonial-card {
      background: #fff;
      border-radius: var(--radius-card);
      transition: var(--transition);
    }

    .feature-card {
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
    }

    .feature-card:hover {
      border-color: var(--accent);
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    .service-card {
      padding: 2.5rem;
      border: 1px solid var(--border-light);
    }

    .service-card:hover .icon-block {
      filter: hue-rotate(15deg);
    }

    .icon-block {
      width: 60px;
      height: 60px;
      background: rgba(30,58,63,0.1);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.8rem;
      transition: var(--transition);
    }

    .step-number {
      font-size: 3rem;
      font-weight: 700;
      color: transparent;
      -webkit-text-stroke: 1px var(--primary);
      font-family: var(--font-serif);
    }

    .case-card {
      border-radius: var(--radius-card);
      border-left: 4px solid var(--accent);
      box-shadow: var(--shadow-sm);
    }

    .data-number {
      font-family: var(--font-serif);
      font-weight: 700;
      font-size: 2.5rem;
      color: var(--primary);
    }

    .testimonial-card {
      background: #fff;
      border-radius: 16px;
      box-shadow: 0 12px 30px rgba(0,0,0,0.04);
      padding: 3rem;
      position: relative;
    }

    .quote-mark {
      position: absolute;
      top: -20px;
      left: 30px;
      font-size: 6rem;
      color: var(--accent);
      opacity: 0.2;
      line-height: 1;
    }

    .accordion-button {
      font-weight: 600;
      color: var(--text-main);
      background: #fff;
      border: none;
      border-bottom: 1px solid #EEE;
      box-shadow: none;
      padding: 1.2rem 0;
    }

    .accordion-button:not(.collapsed) {
      background: transparent;
      color: var(--primary);
      box-shadow: none;
    }

    .accordion-button::after {
      background-image: none;
      content: '+';
      font-size: 1.5rem;
      color: var(--accent);
      font-weight: 400;
    }

    .accordion-button:not(.collapsed)::after {
      content: '−';
    }

    .cta-dark {
      background-color: var(--primary-deep);
      background-image: radial-gradient(circle at 20% 30%, rgba(255,255,255,0.03) 1px, transparent 1px);
      background-size: 40px 40px;
    }

    .footer {
      background: #1A1A1A;
      color: rgba(255,255,255,0.7);
    }

    .footer a {
      color: rgba(255,255,255,0.8);
    }

    .footer a:hover {
      color: #fff;
    }

    .footer h5 {
      color: #fff;
      font-weight: 600;
    }

    .footer .border-top {
      border-color: rgba(255,255,255,0.1) !important;
    }

    @media (max-width: 768px) {
      .hero-graphic {
        height: 250px;
        margin-top: 2rem;
      }
      .step-number {
        font-size: 2.5rem;
      }
    }