/* roulang page: index */
:root {
      --primary: #E4002B;
      --primary-dark: #B80022;
      --secondary-dark: #1A1A2E;
      --background-light: #F5F5F7;
      --accent-gold: #FFB800;
      --text-dark: #1D1D1F;
      --text-muted: #6E6E73;
      --white: #FFFFFF;
      --border-light: #E5E5EA;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.08);
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 8px;
      --radius-btn: 30px;
      --transition: 0.25s ease;
      --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
      --max-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-dark);
      background-color: var(--white);
      -webkit-font-smoothing: antialiased;
    }

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

    a {
      text-decoration: none;
      color: inherit;
    }

    button, input {
      font-family: inherit;
      outline: none;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    #main-nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(12px);
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.06);
      transition: var(--transition);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      font-weight: 800;
      font-size: 1.8rem;
      letter-spacing: -0.5px;
      color: var(--primary);
      display: flex;
      align-items: baseline;
      gap: 4px;
    }
    .logo span {
      color: var(--secondary-dark);
      font-weight: 600;
      font-size: 1.2rem;
      margin-left: 2px;
    }

    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 1rem;
      color: var(--text-dark);
      position: relative;
      padding: 4px 0;
      transition: color var(--transition);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 50%;
      transform: translateX(-50%);
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.3s ease;
    }

    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--text-dark);
      cursor: pointer;
    }

    .mobile-menu {
      display: none;
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .mobile-menu {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0,0,0,0.5);
        z-index: 200;
        visibility: hidden;
        opacity: 0;
        transition: 0.3s ease;
      }
      .mobile-menu.active {
        visibility: visible;
        opacity: 1;
      }
      .mobile-drawer {
        width: 300px;
        height: 100%;
        background: white;
        padding: 2rem 1.5rem;
        display: flex;
        flex-direction: column;
        gap: 2rem;
        box-shadow: 16px 0 40px rgba(0,0,0,0.1);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
      }
      .mobile-menu.active .mobile-drawer {
        transform: translateX(0);
      }
      .close-drawer {
        align-self: flex-end;
        background: none;
        border: none;
        font-size: 2rem;
        color: var(--text-dark);
        cursor: pointer;
        margin-bottom: 1rem;
      }
      .mobile-drawer a {
        font-size: 1.3rem;
        font-weight: 600;
        padding: 0.8rem 0;
        border-bottom: 1px solid var(--border-light);
        display: block;
      }
    }

    /* Hero */
    #hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: var(--secondary-dark);
      position: relative;
      overflow: hidden;
    }
    .hero-bg-lines {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 30% 40%, rgba(228,0,43,0.25) 0%, transparent 60%);
    }
    .hero-container {
      display: flex;
      align-items: center;
      gap: 3rem;
      position: relative;
      z-index: 2;
      width: 100%;
    }
    .hero-text {
      flex: 1;
      color: white;
    }
    .hero-text h1 {
      font-size: clamp(2.8rem, 6vw, 3.8rem);
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.5rem;
      letter-spacing: -0.5px;
    }
    .hero-highlight {
      color: var(--accent-gold);
      display: inline-block;
      border-bottom: 4px solid var(--primary);
    }
    .hero-sub {
      font-size: 1.3rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2.5rem;
      max-width: 500px;
    }
    .hero-actions {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-gold);
      color: #1A1A2E;
      font-weight: 700;
      padding: 0.9rem 2.5rem;
      border-radius: var(--radius-btn);
      border: none;
      font-size: 1.1rem;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: all var(--transition);
      box-shadow: 0 8px 18px rgba(255,184,0,0.3);
      cursor: pointer;
    }
    .btn-primary:hover {
      filter: brightness(1.1);
      transform: scale(1.03);
      box-shadow: 0 12px 24px rgba(255,184,0,0.45);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 0.85rem 2.3rem;
      border-radius: var(--radius-btn);
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: white;
      color: var(--secondary-dark);
    }
    .hero-image {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-image img {
      max-height: 450px;
      object-fit: contain;
      filter: drop-shadow(0 20px 30px rgba(0,0,0,0.5));
      transform: perspective(800px) rotateY(-3deg);
      border-radius: 24px;
    }
    @media (max-width: 768px) {
      .hero-container {
        flex-direction: column;
        text-align: center;
        padding: 4rem 0;
      }
      .hero-text {
        margin-bottom: 2rem;
      }
      .hero-sub {
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
      }
      .hero-actions {
        justify-content: center;
      }
    }

    /* 通用板块 */
    section {
      padding: 5rem 0;
    }
    .section-header {
      text-align: center;
      margin-bottom: 3.5rem;
    }
    .section-header h2 {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--secondary-dark);
      margin-bottom: 1rem;
    }
    .section-divider {
      width: 70px;
      height: 4px;
      background: var(--primary);
      margin: 0.8rem auto;
      border-radius: 2px;
    }

    /* 痛点解决方案 */
    #solution {
      background: var(--white);
    }
    .solution-grid {
      display: flex;
      gap: 2.5rem;
      align-items: flex-start;
    }
    .pain-list, .solution-list {
      flex: 1;
      display: flex;
      flex-direction: column;
      gap: 2rem;
    }
    .pain-item, .solution-card {
      background: var(--background-light);
      padding: 1.8rem;
      border-radius: var(--radius-md);
      display: flex;
      gap: 1rem;
    }
    .pain-item i {
      color: var(--primary);
      font-size: 1.8rem;
      margin-top: 2px;
    }
    .solution-card {
      background: white;
      box-shadow: var(--shadow-card);
      border-left: 4px solid var(--primary);
      transition: var(--transition);
      align-items: center;
    }
    .solution-card i {
      color: var(--accent-gold);
      font-size: 1.8rem;
    }
    .solution-card h3 {
      font-weight: 700;
      margin-bottom: 0.3rem;
    }
    @media (max-width: 768px) {
      .solution-grid {
        flex-direction: column;
      }
    }

    /* 核心成果 */
    #results {
      background: var(--background-light);
    }
    .results-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2rem;
      text-align: center;
    }
    .stat-card {
      background: white;
      padding: 2rem 1rem;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent-gold);
    }
    @media (max-width: 768px) {
      .results-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    /* 证言 */
    #testimonials {
      background: white;
    }
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 2rem;
    }
    .testimonial-card {
      background: var(--background-light);
      padding: 2rem;
      border-radius: var(--radius-md);
      display: flex;
      gap: 1.2rem;
      transition: all var(--transition);
      border: 2px solid transparent;
    }
    .testimonial-card:hover {
      border-color: var(--accent-gold);
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .avatar {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      background: #ccc;
      flex-shrink: 0;
      background-size: cover;
    }
    .quote {
      font-style: italic;
      color: var(--text-dark);
      margin-bottom: 0.8rem;
      position: relative;
      padding-left: 1.2rem;
    }
    .quote::before {
      content: "“";
      font-size: 3rem;
      color: var(--primary);
      position: absolute;
      left: -15px;
      top: -18px;
      font-weight: bold;
    }
    @media (max-width: 768px) {
      .testimonials-grid {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    details {
      border-bottom: 1px solid var(--border-light);
      padding: 1.2rem 0;
      transition: background 0.2s;
    }
    details[open] {
      background: #fafafa;
      padding-left: 1rem;
    }
    summary {
      font-weight: 600;
      font-size: 1.2rem;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    summary::-webkit-details-marker {
      display: none;
    }
    .faq-icon {
      font-size: 1.5rem;
      color: var(--primary);
    }

    /* 终局CTA */
    #contact {
      background: var(--secondary-dark);
      color: white;
      position: relative;
    }
    .contact-form {
      max-width: 500px;
      margin: 2rem auto 0;
      display: flex;
      flex-direction: column;
      gap: 1.2rem;
    }
    .contact-form input {
      padding: 1rem 1.5rem;
      border-radius: var(--radius-sm);
      border: none;
      background: white;
      font-size: 1rem;
    }
    .contact-form input:focus {
      box-shadow: 0 0 0 3px rgba(228,0,43,0.5);
    }

    footer {
      background: #0f0f1a;
      color: #ccc;
      padding: 3rem 0 2rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }