/* roulang page: index */
:root {
      --primary: #FF5E14;
      --primary-dark: #E04A0A;
      --secondary: #FFB800;
      --deep-black: #1A1A1A;
      --charcoal: #2D2D2D;
      --light-bg: #FAFAFA;
      --green-accent: #00C897;
      --text-primary: #1A1A1A;
      --text-secondary: #444;
      --text-muted: #666;
      --text-light: #CCC;
      --white: #FFFFFF;
      --border-light: rgba(0,0,0,0.06);
      --border-medium: rgba(0,0,0,0.1);
      --radius-sm: 14px;
      --radius-md: 20px;
      --radius-pill: 50px;
      --shadow-card: 0 8px 30px rgba(0,0,0,0.08);
      --shadow-card-hover: 0 16px 40px rgba(0,0,0,0.15);
      --shadow-button: 0 4px 15px rgba(255,94,20,0.4);
      --shadow-button-hover: 0 8px 25px rgba(255,94,20,0.5);
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition-default: all 0.3s ease;
      --container-max: 1200px;
      --header-height: 72px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-body);
      line-height: 1.75;
      background-color: var(--white);
      color: var(--text-primary);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      overflow-x: hidden;
    }

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

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

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

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: transparent;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      height: var(--header-height);
      display: flex;
      align-items: center;
    }

    .header.scrolled {
      background: var(--deep-black);
      box-shadow: 0 2px 20px rgba(0,0,0,0.2);
    }

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

    .logo {
      display: flex;
      align-items: baseline;
      gap: 6px;
      font-weight: 700;
      font-size: 1.5rem;
      color: var(--white);
      letter-spacing: -0.3px;
    }

    .logo span {
      font-size: 0.8rem;
      font-weight: 500;
      background: rgba(255,255,255,0.15);
      padding: 2px 8px;
      border-radius: 20px;
      color: rgba(255,255,255,0.9);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-menu a {
      color: rgba(255,255,255,0.85);
      font-weight: 500;
      font-size: 0.95rem;
      position: relative;
      padding: 6px 0;
    }

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }

    .nav-menu a:hover {
      color: var(--white);
    }

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

    .btn-nav {
      background: var(--primary);
      color: var(--white);
      padding: 12px 24px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 0.9rem;
      box-shadow: 0 4px 12px rgba(255,94,20,0.3);
      transition: var(--transition-default);
      border: none;
      cursor: pointer;
      white-space: nowrap;
    }

    .btn-nav:hover {
      background: var(--primary-dark);
      box-shadow: 0 8px 20px rgba(255,94,20,0.5);
      transform: scale(1.02);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 5px;
    }

    .hamburger span {
      width: 26px;
      height: 2.5px;
      background: var(--white);
      border-radius: 2px;
      transition: var(--transition-default);
    }

    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--deep-black);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 40px;
      transform: translateX(100%);
      transition: transform 0.4s ease;
      z-index: 999;
      list-style: none;
    }

    .mobile-menu.active {
      transform: translateX(0);
    }

    .mobile-menu a {
      color: var(--white);
      font-size: 1.6rem;
      font-weight: 600;
    }

    .mobile-menu .btn-nav {
      font-size: 1.1rem;
      padding: 16px 40px;
    }

    /* Hero */
    .hero {
      background: var(--deep-black);
      background-image: radial-gradient(circle at 30% 40%, rgba(255,94,20,0.25) 0%, transparent 60%),
                        url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      min-height: 620px;
      display: flex;
      align-items: center;
      padding-top: var(--header-height);
      color: var(--white);
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: -30%;
      right: -10%;
      width: 500px;
      height: 500px;
      background: radial-gradient(circle, rgba(255,184,0,0.2) 0%, transparent 70%);
      border-radius: 50%;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      position: relative;
      z-index: 2;
    }

    .hero-content h1 {
      font-family: var(--font-title);
      font-weight: 800;
      font-size: 3rem;
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
      color: var(--white);
    }

    .hero-content .subtitle {
      font-size: 1.1rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 450px;
    }

    .hero-buttons {
      display: flex;
      align-items: center;
      gap: 20px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: var(--white);
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      font-size: 1rem;
      border: none;
      cursor: pointer;
      box-shadow: var(--shadow-button);
      transition: var(--transition-default);
      display: inline-block;
    }

    .btn-primary:hover {
      box-shadow: var(--shadow-button-hover);
      transform: scale(1.03);
      filter: brightness(1.05);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-pill);
      font-weight: 600;
      transition: var(--transition-default);
    }

    .btn-outline:hover {
      background: rgba(255,94,20,0.1);
    }

    .hero-image {
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }

    .hero-image img {
      max-width: 320px;
      filter: drop-shadow(0 20px 30px rgba(0,0,0,0.5));
      border-radius: 30px;
    }

    .badge-float {
      position: absolute;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      color: var(--deep-black);
      padding: 8px 16px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 0.9rem;
      box-shadow: 0 10px 25px rgba(0,0,0,0.2);
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .badge-top {
      top: 10px;
      right: 5px;
    }

    .badge-bottom {
      bottom: 15px;
      left: 0;
      background: var(--green-accent);
      color: white;
    }

    /* 通用区块 */
    .section {
      padding: 90px 0;
    }

    .section-dark {
      background: var(--charcoal);
      color: var(--white);
    }

    .section-light {
      background: var(--light-bg);
    }

    .section-title {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 2.3rem;
      text-align: center;
      margin-bottom: 20px;
      letter-spacing: -0.3px;
    }

    .section-subtitle {
      text-align: center;
      color: var(--text-muted);
      max-width: 650px;
      margin: 0 auto 50px;
      font-size: 1.1rem;
    }

    .dark-title {
      color: var(--white);
    }

    .dark-subtitle {
      color: rgba(255,255,255,0.7);
    }

    /* 痛点卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .pain-card {
      background: var(--white);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-card);
      border-left: 5px solid var(--primary);
      transition: var(--transition-default);
    }

    .pain-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-card-hover);
    }

    .pain-card h3 {
      font-weight: 600;
      font-size: 1.3rem;
      margin-bottom: 12px;
    }

    .pain-card p {
      color: var(--text-muted);
      font-size: 0.95rem;
    }

    /* 解决方案大卡 */
    .solution-card {
      background: var(--white);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition-default);
      display: flex;
      flex-direction: column;
    }

    .solution-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }

    .solution-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .solution-body {
      padding: 25px;
      position: relative;
    }

    .solution-body h3 {
      font-weight: 700;
      font-size: 1.4rem;
      margin-bottom: 10px;
    }

    .solution-body p {
      color: var(--text-secondary);
      margin-bottom: 15px;
    }

    .data-badge {
      position: absolute;
      top: -25px;
      right: 20px;
      background: var(--primary);
      color: white;
      font-weight: 800;
      font-size: 1.1rem;
      padding: 6px 16px;
      border-radius: 30px;
      box-shadow: 0 6px 18px rgba(255,94,20,0.35);
    }

    /* 数据徽章阵列 */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 20px;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-weight: 800;
      font-size: 2.8rem;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .stat-label {
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 证言 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .testimonial-card {
      background: var(--white);
      padding: 28px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-card);
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }

    .avatar {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--charcoal);
      flex-shrink: 0;
    }

    .testimonial-text {
      font-style: italic;
      color: var(--text-secondary);
      margin-bottom: 12px;
    }

    .stars {
      color: var(--secondary);
      letter-spacing: 2px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-medium);
      padding: 18px 0;
    }

    .faq-question {
      font-weight: 600;
      font-size: 1.15rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      padding-right: 20px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 终局 CTA */
    .final-cta {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      padding: 80px 0;
      text-align: center;
      color: white;
    }

    .final-cta h2 {
      font-size: 2.4rem;
      font-weight: 700;
    }

    .btn-white {
      background: white;
      color: var(--primary);
      padding: 16px 44px;
      border-radius: var(--radius-pill);
      font-weight: 700;
      display: inline-block;
      margin-top: 25px;
    }

    /* 页脚 */
    .footer {
      background: var(--deep-black);
      color: #888;
      padding: 50px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 30px;
    }

    .footer-brand {
      font-weight: 700;
      font-size: 1.4rem;
      color: white;
    }

    .copyright {
      border-top: 1px solid rgba(255,255,255,0.08);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 0.8rem;
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero-image { margin-top: 30px; }
      .cards-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-menu { display: none; }
      .hamburger { display: flex; }
      .cards-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .hero-content h1 { font-size: 2.2rem; }
      .section-title { font-size: 1.9rem; }
      .header { height: 60px; }
    }