/* roulang page: index */
:root {
      --deep-violet: #1a0f2e;
      --charcoal-black: #0d0b1a;
      --stellar-gold: #f0b90b;
      --nebula-purple: #7b4fbf;
      --deep-space-gray: #2a2438;
      --cosmic-white: #f8f7fc;
      --text-primary: #1e1b2c;
      --text-secondary: #4a4458;
      --text-light: #9e98a8;
      --border-light: rgba(123, 79, 191, 0.2);
      --shadow-card: 0 4px 20px rgba(26, 15, 46, 0.08);
      --shadow-hover: 0 8px 30px rgba(26, 15, 46, 0.15);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-input: 4px;
      --transition: 0.3s ease;
      --max-width: 1200px;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      line-height: 1.7;
      color: var(--text-primary);
      background-color: #fff;
      -webkit-font-smoothing: antialiased;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      transition: all var(--transition);
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      font-weight: 600;
    }

    input, textarea {
      font-family: inherit;
      background: transparent;
      border: none;
      border-bottom: 1px solid rgba(255,255,255,0.3);
      padding: 0.75rem 0.25rem;
      color: white;
      outline: none;
      transition: border-color var(--transition);
      width: 100%;
    }
    input:focus, textarea:focus {
      border-bottom: 2px solid var(--stellar-gold);
    }
    input::placeholder, textarea::placeholder {
      color: rgba(255,255,255,0.5);
    }

    .container {
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航样式 */
    #top-bar {
      background: var(--deep-violet);
      color: white;
      font-size: 0.8rem;
      height: 36px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    #top-bar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .top-bar-left {
      opacity: 0.85;
      letter-spacing: 0.3px;
    }
    .top-bar-right a {
      color: white;
      text-decoration: underline;
      text-underline-offset: 2px;
      font-weight: 500;
      margin-left: 1.25rem;
    }

    #main-nav {
      background: rgba(13, 11, 26, 0.92);
      backdrop-filter: blur(12px);
      position: sticky;
      top: 0;
      z-index: 50;
      border-bottom: 1px solid rgba(123, 79, 191, 0.2);
      transition: box-shadow var(--transition);
    }
    #main-nav.scrolled {
      box-shadow: 0 6px 20px rgba(0,0,0,0.4);
    }
    #main-nav .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.3rem;
    }
    .logo i {
      color: var(--stellar-gold);
      font-size: 2rem;
    }
    .nav-links {
      display: flex;
      gap: 2rem;
    }
    .nav-links a {
      color: #ddd;
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--stellar-gold);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--stellar-gold);
      transition: width var(--transition);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--stellar-gold);
      color: var(--deep-violet);
      padding: 0.65rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: 0 4px 10px rgba(240,185,11,0.3);
    }
    .btn-primary:hover {
      background: #ffcf2b;
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(240,185,11,0.45);
    }
    .btn-outline {
      border: 1.5px solid var(--nebula-purple);
      color: var(--nebula-purple);
      padding: 0.6rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: rgba(123,79,191,0.08);
    }
    .btn-text {
      color: var(--stellar-gold);
      font-weight: 600;
      padding: 0;
    }
    .btn-text i {
      transition: transform 0.2s;
    }
    .btn-text:hover i {
      transform: translateX(4px);
    }
    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: white;
      background: none;
      border: none;
      cursor: pointer;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(13,11,26,0.98);
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 2.5rem;
      z-index: 60;
      font-size: 1.5rem;
    }
    .mobile-menu a {
      color: white;
      font-weight: 600;
    }
    .mobile-menu .btn-primary {
      font-size: 1.2rem;
      padding: 0.8rem 2.5rem;
    }

    /* 区块通用 */
    section {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      margin-bottom: 2.5rem;
      color: var(--deep-violet);
      letter-spacing: -0.5px;
    }
    .bg-dark {
      background: linear-gradient(135deg, var(--deep-violet) 0%, var(--charcoal-black) 100%);
      color: white;
    }
    .bg-soft {
      background: var(--cosmic-white);
    }

    /* Hero */
    #hero {
      background: radial-gradient(circle at 20% 30%, #2a1a4a, #0d0b1a 80%);
      position: relative;
      overflow: hidden;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.3;
      color: white;
    }
    .hero-content h1 span {
      color: var(--stellar-gold);
    }
    .hero-sub {
      font-size: 1.2rem;
      color: #d0c7e5;
      margin: 1.5rem 0 2rem;
      max-width: 90%;
    }
    .hero-image {
      position: relative;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }

    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1.8rem;
    }
    .pain-card {
      background: white;
      padding: 2rem 1.8rem;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--nebula-purple);
      transition: var(--transition);
    }
    .pain-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .pain-card i {
      color: var(--nebula-purple);
      font-size: 2rem;
      margin-bottom: 1rem;
    }

    /* 解决方案图文 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 3.5rem;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-text {
      flex: 1;
    }
    .solution-img {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 15px 30px rgba(0,0,0,0.1);
    }
    .data-highlight {
      color: var(--stellar-gold);
      font-weight: 800;
      font-size: 1.8rem;
    }
    /* 成果数字 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 2rem;
    }
    .stat-number {
      font-size: 3.5rem;
      font-weight: 800;
      color: var(--stellar-gold);
    }
    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .testimonial-card {
      background: white;
      padding: 2rem;
      border-radius: 20px;
      box-shadow: var(--shadow-card);
      position: relative;
    }
    .testimonial-card i.fa-quote-left {
      color: var(--nebula-purple);
      opacity: 0.3;
      font-size: 2rem;
    }
    /* FAQ */
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 0.8rem;
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }
    .faq-question {
      padding: 1.2rem 1.8rem;
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: var(--cosmic-white);
      border-radius: 12px;
    }
    .faq-answer {
      padding: 0 1.8rem 1.2rem;
      display: none;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-question i {
      transform: rotate(45deg);
    }
    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2.5rem;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .pain-grid { grid-template-columns: 1fr 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .testimonial-grid { grid-template-columns: 1fr; }
      .solution-row { flex-direction: column; }
      .solution-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-cta { display: none; }
      .hamburger { display: block; }
      .pain-grid { grid-template-columns: 1fr; }
      .section-title { font-size: 1.8rem; }
      #top-bar .top-bar-left span { display: none; }
      .footer-grid { grid-template-columns: 1fr; }
    }