/* roulang page: index */
:root {
      --primary-deep-green: #1A5F2A;
      --primary-orange: #F5A623;
      --dark-charcoal: #2C2C2C;
      --warm-white-bg: #F9F9F5;
      --card-white: #FFFFFF;
      --soft-gray: #6B7280;
      --border-light: rgba(26, 95, 42, 0.15);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-input: 10px;
      --shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.04);
      --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.08);
      --transition-base: 0.3s ease;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      --section-gap: 100px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white-bg);
      color: var(--dark-charcoal);
      line-height: 1.5;
      font-weight: 400;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

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

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

    button, input {
      font-family: var(--font-sans);
    }

    /* 导航 */
    #main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      padding: 16px 0;
      transition: background var(--transition-base), backdrop-filter var(--transition-base);
      background: transparent;
    }

    #main-nav.scrolled {
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.7rem;
      font-weight: 800;
      color: #FFFFFF;
      letter-spacing: 0.5px;
      text-shadow: 0 2px 8px rgba(0,0,0,0.2);
      transition: color var(--transition-base);
    }
    #main-nav.scrolled .logo {
      color: var(--primary-deep-green);
      text-shadow: none;
    }

    .logo-icon {
      font-size: 2rem;
      color: var(--primary-orange);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
      font-weight: 600;
      font-size: 1rem;
    }

    .nav-links a {
      color: rgba(255,255,255,0.9);
      position: relative;
      padding: 4px 0;
    }

    #main-nav.scrolled .nav-links a {
      color: var(--dark-charcoal);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-orange);
      transition: width var(--transition-base);
    }

    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-nav-cta {
      background: var(--primary-orange);
      color: #1A1A1A !important;
      padding: 10px 24px;
      border-radius: 50px;
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(245,166,35,0.4);
      margin-left: 12px;
    }
    .btn-nav-cta:hover {
      background: #E09000;
      transform: scale(1.03);
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: white;
      cursor: pointer;
    }
    #main-nav.scrolled .hamburger {
      color: var(--primary-deep-green);
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(26, 95, 42, 0.98);
        backdrop-filter: blur(15px);
        flex-direction: column;
        justify-content: center;
        gap: 28px;
        font-size: 1.8rem;
        z-index: 999;
      }
      .nav-links.active {
        display: flex;
      }
      .hamburger {
        display: block;
        z-index: 1001;
      }
      .btn-nav-cta {
        background: white;
        color: var(--primary-deep-green) !important;
      }
    }

    /* Hero */
    #hero {
      height: 100vh;
      min-height: 700px;
      background: linear-gradient(180deg, rgba(26,95,42,0.6) 0%, rgba(26,95,42,0.2) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      position: relative;
      color: white;
    }

    .hero-content {
      max-width: 800px;
      margin-top: 40px;
    }

    .hero-content h1 {
      font-size: clamp(2.6rem, 5vw, 3.8rem);
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
    }

    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 36px;
      font-weight: 400;
    }

    .hero-btns {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--primary-orange);
      color: #1A1A1A;
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: var(--transition-base);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #E09000;
      transform: scale(1.02);
    }

    .btn-secondary {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: var(--transition-base);
    }
    .btn-secondary:hover {
      background: white;
      color: var(--primary-deep-green);
    }

    .floating-ball {
      position: absolute;
      bottom: 30px;
      right: 50px;
      width: 70px;
      height: 70px;
      background: rgba(255,255,255,0.2);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      animation: bounce 2s infinite;
    }

    @keyframes bounce {
      0%,100%{ transform: translateY(0); }
      50%{ transform: translateY(-15px); }
    }

    section {
      padding: var(--section-gap) 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-size: clamp(2rem, 4vw, 2.5rem);
      font-weight: 700;
      color: var(--dark-charcoal);
      margin-bottom: 14px;
    }
    .section-title p {
      color: var(--soft-gray);
      font-size: 1.1rem;
    }

    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }
    .pain-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      display: flex;
      gap: 20px;
    }
    .pain-icon {
      font-size: 2.4rem;
      color: var(--primary-deep-green);
    }
    .pain-text h3 {
      font-weight: 700;
      margin-bottom: 8px;
    }

    @media (max-width: 768px) {
      .pain-grid {
        grid-template-columns: 1fr;
      }
      .floating-ball {
        right: 20px;
      }
    }

    /* 解决方案 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition-base);
      border-top: 4px solid var(--primary-deep-green);
    }
    .solution-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-6px);
    }
    .solution-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .solution-content {
      padding: 24px;
    }
    .solution-content h3 {
      margin-bottom: 10px;
    }
    .solution-link {
      color: var(--primary-deep-green);
      font-weight: 700;
      margin-top: 16px;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 数据 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      text-align: center;
    }
    .stat-item .count {
      font-size: 3.2rem;
      font-weight: 800;
      color: var(--primary-deep-green);
    }
    @media (max-width:768px){
      .solutions-grid, .stats-grid{ grid-template-columns:1fr; }
    }

    /* 证言 */
    .testimonials-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
    }
    .testimonial-card {
      min-width: 320px;
      background: white;
      padding: 28px;
      border-radius: var(--radius-card);
      display: flex;
      gap: 18px;
      align-items: center;
    }
    .avatar {
      width: 70px;
      height: 70px;
      background: #ddd;
      border-radius: 50%;
    }

    /* FAQ */
    .faq-item {
      background: white;
      margin-bottom: 12px;
      border-radius: 12px;
      padding: 18px 24px;
      cursor: pointer;
      border-left: 4px solid transparent;
      transition: 0.2s;
    }
    .faq-item.active {
      border-left-color: var(--primary-deep-green);
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
    }

    /* CTA */
    .cta-section {
      background: var(--primary-deep-green);
      color: white;
      text-align: center;
      border-radius: 32px;
      margin: 0 24px;
    }
    .cta-input {
      display: flex;
      max-width: 450px;
      margin: 20px auto;
    }
    .cta-input input {
      flex:1;
      padding: 14px;
      border-radius: 30px 0 0 30px;
      border: none;
    }
    .cta-input button {
      background: var(--primary-orange);
      border: none;
      padding: 0 28px;
      border-radius: 0 30px 30px 0;
      font-weight: 700;
    }

    footer {
      background: #1E293B;
      color: #CBD5E1;
      padding: 60px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width:768px){
      .footer-grid{ grid-template-columns:1fr; }
    }