/* roulang page: index */
:root {
      --primary: #F04E23;
      --primary-hover: #D43D1A;
      --dark: #1A1A1A;
      --surface: #F8F6F3;
      --muted: #A8A6A1;
      --accent: #D4A843;
      --white: #FFFFFF;
      --light-gray: #F0EEEA;
      --card-bg: #FAF9F7;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 12px 28px rgba(240,78,35,0.12);
      --radius-lg: 12px;
      --radius-md: 8px;
      --transition: all 0.25s ease;
      --container-max: 1200px;
      --section-gap: 100px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--surface);
      color: var(--dark);
      line-height: 1.75;
      font-weight: 300;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

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

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

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

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

    /* 导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
      padding: 16px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: transparent;
      transition: background 0.3s ease, box-shadow 0.3s ease, padding 0.3s ease;
    }

    .navbar.scrolled {
      background: rgba(255,255,255,0.97);
      backdrop-filter: blur(10px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      padding: 12px 32px;
    }

    .logo {
      font-weight: 800;
      font-size: 1.8rem;
      color: var(--primary);
      letter-spacing: -0.02em;
      transition: color 0.3s;
    }
    .navbar.scrolled .logo {
      color: var(--primary);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 1rem;
      color: white;
      letter-spacing: 0.02em;
      position: relative;
    }
    .navbar.scrolled .nav-links a {
      color: var(--dark);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-nav {
      background: var(--primary);
      color: white !important;
      padding: 10px 24px;
      border-radius: var(--radius-md);
      font-weight: 600;
      letter-spacing: 0.05em;
      transition: background 0.2s;
    }
    .btn-nav:hover {
      background: var(--primary-hover);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
    }
    .hamburger span {
      width: 25px;
      height: 3px;
      background: white;
      border-radius: 2px;
      transition: 0.3s;
    }
    .navbar.scrolled .hamburger span {
      background: var(--dark);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: var(--primary);
      z-index: 45;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 2.5rem;
      transform: translateX(100%);
      transition: transform 0.35s ease;
    }
    .mobile-menu.active {
      transform: translateX(0);
    }
    .mobile-menu a {
      color: white;
      font-size: 1.8rem;
      font-weight: 600;
    }

    /* Hero */
    .hero {
      height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: flex-start;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: rgba(0,0,0,0.55);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 700px;
      margin-left: 8%;
    }
    .hero-tag {
      display: inline-block;
      background: rgba(240,78,35,0.9);
      backdrop-filter: blur(6px);
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 500;
      margin-bottom: 24px;
    }
    .hero h1 {
      font-size: 3.5rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 1.25rem;
      opacity: 0.9;
      margin-bottom: 36px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      letter-spacing: 0.05em;
      border: none;
      cursor: pointer;
      transition: var(--transition);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: white;
      color: var(--dark);
    }
    .scroll-indicator {
      position: absolute;
      bottom: 30px;
      left: 50%;
      transform: translateX(-50%);
      animation: bounce 2s infinite;
      color: white;
      font-size: 1.8rem;
    }

    @keyframes bounce {
      0%,20%,50%,80%,100%{transform:translateX(-50%) translateY(0);}
      40%{transform:translateX(-50%) translateY(-10px);}
      60%{transform:translateX(-50%) translateY(-5px);}
    }

    /* 板块通用 */
    section {
      padding: var(--section-gap) 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--dark);
      position: relative;
      display: inline-block;
    }
    .section-title h2::after {
      content: '';
      position: absolute;
      bottom: -12px;
      left: 50%;
      transform: translateX(-50%);
      width: 60px;
      height: 3px;
      background: var(--primary);
    }

    /* 优势卡片 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
    }
    .adv-card {
      background: var(--card-bg);
      padding: 2rem;
      border-radius: var(--radius-lg);
      text-align: center;
      transition: var(--transition);
    }
    .adv-card i {
      font-size: 3rem;
      color: var(--primary);
      margin-bottom: 16px;
    }
    .adv-number {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }
    .adv-title {
      font-weight: 700;
      font-size: 1.2rem;
      margin: 10px 0 8px;
    }
    .adv-desc {
      color: var(--muted);
      font-size: 0.9rem;
    }

    /* 交错图文 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .service-img img {
      width: 100%;
      height: auto;
    }
    .service-text {
      flex: 1;
    }
    .service-text h3 {
      font-size: 1.8rem;
      font-weight: 700;
      margin-bottom: 16px;
      border-left: 4px solid var(--primary);
      padding-left: 16px;
    }
    .service-text p {
      margin-bottom: 20px;
    }

    /* 教练滑动 */
    .coach-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 20px;
      scrollbar-width: thin;
    }
    .coach-card {
      min-width: 240px;
      background: white;
      border-radius: var(--radius-lg);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .coach-card img {
      width: 90px;
      height: 90px;
      border-radius: 50%;
      object-fit: cover;
      border: 3px solid var(--primary);
      margin: 0 auto 12px;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      padding: 18px 24px;
      cursor: pointer;
      transition: 0.2s;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--muted);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .faq-item.active {
      border-left: 4px solid var(--primary);
      background: #FDFCFA;
    }

    /* CTA */
    .cta-section {
      background: var(--dark);
      color: white;
      text-align: center;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 30px;
    }
    .cta-form input, .cta-form select {
      padding: 14px;
      border-radius: var(--radius-md);
      border: none;
      min-width: 200px;
    }

    /* 页脚 */
    footer {
      background: var(--dark);
      color: var(--muted);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 30px;
    }

    @media (max-width: 1024px) {
      .advantages-grid { grid-template-columns: repeat(2,1fr); }
      .service-row { flex-direction: column; gap: 30px; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .hero h1 { font-size: 2.3rem; }
      .advantages-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .mobile-menu { display: flex; }
    }