/* roulang page: index */
:root {
      --deep-space: #0A0E1A;
      --electric-gold: #D4AF37;
      --ice-blue: #4FC3F7;
      --text-primary: #FFFFFF;
      --text-secondary: #B0C4DE;
      --text-body: #8A9BB5;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-hover-border: rgba(79, 195, 247, 0.4);
      --card-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
      --hover-glow: 0 0 24px rgba(79, 195, 247, 0.15);
      --gold-gradient: linear-gradient(135deg, #D4AF37, #B8960C);
      --border-radius-lg: 20px;
      --border-radius-md: 16px;
      --border-radius-sm: 12px;
      --bs-primary: #D4AF37;
      --bs-body-bg: #0A0E1A;
      --bs-body-color: #B0C4DE;
      --bs-border-radius: 16px;
      font-size: 16px;
    }
    * {
      box-sizing: border-box;
    }
    body {
      background-color: var(--deep-space);
      color: var(--text-body);
      font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
      letter-spacing: 0.02em;
    }
    h1, h2, h3, h4, h5 {
      color: var(--text-primary);
      font-weight: 700;
      letter-spacing: 0.05em;
    }
    a {
      text-decoration: none;
      transition: all 0.3s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 自定义导航覆盖 */
    .navbar {
      background: rgba(10, 14, 26, 0.85);
      backdrop-filter: blur(24px);
      -webkit-backdrop-filter: blur(24px);
      border-bottom: 1px solid rgba(212, 175, 55, 0.25);
      padding: 12px 0;
    }
    .navbar-brand {
      font-weight: 700;
      font-size: 1.6rem;
      color: var(--electric-gold) !important;
      letter-spacing: 0.08em;
      display: flex;
      align-items: center;
    }
    .navbar-brand i {
      font-size: 1.8rem;
      margin-right: 8px;
      color: var(--electric-gold);
    }
    .nav-link {
      color: var(--text-secondary) !important;
      font-weight: 500;
      margin: 0 12px;
      position: relative;
      transition: 0.3s;
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--electric-gold);
      transition: width 0.3s ease;
    }
    .nav-link:hover {
      color: var(--electric-gold) !important;
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .btn-outline-gold {
      border: 1px solid var(--ice-blue);
      color: var(--ice-blue);
      border-radius: 50px;
      padding: 8px 22px;
      background: transparent;
      transition: 0.3s;
      font-weight: 500;
    }
    .btn-outline-gold:hover {
      background: rgba(79, 195, 247, 0.1);
      border-color: var(--ice-blue);
      box-shadow: 0 0 16px rgba(79, 195, 247, 0.4);
      color: white;
    }
    .btn-solid-gold {
      background: var(--gold-gradient);
      border: none;
      color: #0A0E1A;
      font-weight: 700;
      border-radius: 50px;
      padding: 10px 28px;
      transition: all 0.3s ease;
      letter-spacing: 0.05em;
    }
    .btn-solid-gold:hover {
      box-shadow: 0 0 28px rgba(212, 175, 55, 0.7);
      transform: scale(1.04);
      color: #0A0E1A;
    }
    .navbar-toggler {
      border: none;
      color: white;
    }
    .navbar-toggler-icon {
      background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.8)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
      position: relative;
      overflow: hidden;
    }
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
    }
    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 30% 40%, rgba(79, 195, 247, 0.08) 0%, transparent 60%);
      position: relative;
    }
    .hero-bg-layer {
      position: absolute;
      inset: 0;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      opacity: 0.15;
      z-index: 0;
    }
    .hero-content {
      position: relative;
      z-index: 2;
    }
    .hero-title {
      font-size: clamp(2.8rem, 6vw, 4.2rem);
      font-weight: 700;
      color: white;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-secondary);
      max-width: 550px;
      margin-bottom: 2.5rem;
    }
    .hero-visual {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 420px;
    }
    .glass-stack {
      position: relative;
      width: 100%;
      height: 100%;
    }
    .glass-card-stack {
      position: absolute;
      width: 240px;
      height: 320px;
      background: rgba(255,255,255,0.04);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 28px;
      box-shadow: 0 25px 45px rgba(0,0,0,0.5);
      transition: all 0.4s ease;
      overflow: hidden;
    }
    .stack-1 {
      top: 10px;
      right: 20px;
      transform: rotate(6deg);
      z-index: 3;
    }
    .stack-2 {
      top: 40px;
      right: 70px;
      transform: rotate(-4deg);
      z-index: 2;
    }
    .stack-3 {
      top: 80px;
      right: 120px;
      transform: rotate(9deg);
      z-index: 1;
    }
    .glass-card-stack img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    /* 痛点区 */
    .pain-point-card {
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(6px);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: var(--border-radius-md);
      padding: 2rem;
      transition: 0.3s;
    }
    .pain-point-card i {
      font-size: 2.2rem;
      color: var(--electric-gold);
      margin-bottom: 1rem;
    }
    /* 解决方案非对称卡片 */
    .solution-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: 24px;
      padding: 2.2rem;
      transition: all 0.35s ease;
      box-shadow: var(--card-shadow);
      height: 100%;
    }
    .solution-card:hover {
      transform: translateY(-10px);
      border-color: var(--glass-hover-border);
      box-shadow: var(--hover-glow);
    }
    .solution-card.featured {
      margin-top: -20px;
      margin-bottom: -20px;
      background: rgba(255,255,255,0.05);
      border-color: rgba(212,175,55,0.25);
    }
    .solution-icon {
      font-size: 2.5rem;
      color: var(--electric-gold);
      margin-bottom: 1.2rem;
    }
    /* 成果数据 */
    .metric-number {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--electric-gold);
      line-height: 1.1;
    }
    /* 证言卡片 */
    .testimonial-card {
      background: rgba(255,255,255,0.03);
      backdrop-filter: blur(20px);
      border: 1px solid rgba(255,255,255,0.08);
      border-radius: 28px;
      padding: 2rem;
      min-width: 280px;
    }
    /* FAQ */
    .accordion-button {
      background: rgba(255,255,255,0.03);
      color: #E0E8F0;
      font-weight: 600;
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: 16px !important;
      padding: 1.2rem 1.8rem;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(79,195,247,0.08);
      color: white;
      box-shadow: 0 0 18px rgba(79,195,247,0.2);
      border-color: rgba(79,195,247,0.3);
    }
    .accordion-body {
      background: rgba(255,255,255,0.02);
      color: var(--text-body);
      line-height: 1.8;
    }
    /* CTA */
    #cta {
      background: radial-gradient(circle at center, rgba(212,175,55,0.12) 0%, transparent 70%);
    }
    /* 页脚 */
    footer a {
      color: var(--text-secondary);
    }
    footer a:hover {
      color: var(--electric-gold);
    }
    .social-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: rgba(255,255,255,0.05);
      color: var(--text-secondary);
      transition: 0.3s;
    }
    .social-icon:hover {
      background: var(--electric-gold);
      color: #0A0E1A;
      box-shadow: 0 0 18px rgba(212,175,55,0.6);
    }
    @media (max-width: 768px) {
      .hero-visual {
        margin-top: 2.5rem;
        min-height: 300px;
      }
      .solution-card.featured {
        margin-top: 0;
        margin-bottom: 0;
      }
    }