/* roulang page: index */
:root {
      --primary: #B026FF;
      --primary-glow: rgba(176, 38, 255, 0.6);
      --secondary: #00F0FF;
      --secondary-glow: rgba(0, 240, 255, 0.7);
      --accent: #FF6B35;
      --bg-dark: #0A0A0F;
      --surface: rgba(20, 20, 31, 0.8);
      --surface-solid: #14141F;
      --border-dim: rgba(176, 38, 255, 0.3);
      --text-body: #E0E0E0;
      --text-heading: #FFFFFF;
      --text-muted: #8888AA;
      --radius-card: 12px;
      --radius-sm: 8px;
      --shadow-card: 0 4px 24px rgba(176, 38, 255, 0.15);
      --shadow-glow: 0 8px 32px rgba(0, 240, 255, 0.25);
      --font-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-en: "Inter", "Roboto", sans-serif;
      --max-width: 1200px;
    }

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

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

    body {
      font-family: var(--font-cn);
      background-color: var(--bg-dark);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
      background-image: 
        linear-gradient(rgba(176, 38, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(176, 38, 255, 0.03) 1px, transparent 1px);
      background-size: 40px 40px;
      position: relative;
    }

    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: radial-gradient(ellipse at 20% 20%, rgba(176, 38, 255, 0.12) 0%, transparent 50%),
                  radial-gradient(ellipse at 80% 80%, rgba(0, 240, 255, 0.08) 0%, transparent 50%);
      pointer-events: none;
      z-index: -1;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 2rem;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      color: var(--text-heading);
      letter-spacing: 0.02em;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.3s, background-color 0.3s;
    }

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

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: transparent;
    }

    /* ---------- 导航 ---------- */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(10, 10, 15, 0.85);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--border-dim);
      z-index: 1000;
      display: flex;
      align-items: center;
      transition: background 0.3s;
    }

    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 2rem;
    }

    .logo {
      font-size: 1.8rem;
      font-weight: 900;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      letter-spacing: 0.03em;
      display: flex;
      align-items: center;
      gap: 0.25rem;
    }

    .logo-icon {
      font-size: 2rem;
      line-height: 1;
    }

    .nav-links {
      display: flex;
      gap: 2.2rem;
      list-style: none;
      font-weight: 500;
    }

    .nav-links a {
      color: var(--text-body);
      position: relative;
      padding: 0.25rem 0;
      transition: color 0.3s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -4px;
      width: 0;
      height: 2px;
      background-color: var(--secondary);
      transition: width 0.3s ease;
      box-shadow: 0 0 8px var(--secondary);
    }

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

    .hamburger {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 28px;
      height: 20px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 100%;
      height: 3px;
      background-color: var(--secondary);
      transition: all 0.3s;
    }
    .hamburger.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .hamburger.active span:nth-child(2) { opacity: 0; }
    .hamburger.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

    @media (max-width: 1024px) {
      .nav-links {
        gap: 1.5rem;
      }
    }
    @media (max-width: 768px) {
      .hamburger {
        display: flex;
      }
      .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        height: calc(100vh - 72px);
        background: rgba(5, 5, 10, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2.5rem;
        transform: translateX(100%);
        transition: transform 0.4s ease;
      }
      .nav-links.active {
        transform: translateX(0);
      }
    }

    /* ---------- 英文/数字字体全局渗透 ---------- */
    .counter, .stat-num, button, .btn, .nav-links, .logo {
      font-family: var(--font-en), var(--font-cn);
    }

    /* ---------- 按钮 ---------- */
    .btn-primary {
      display: inline-block;
      background: var(--primary);
      color: white;
      font-weight: 700;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      padding: 0.9rem 2.2rem;
      border-radius: var(--radius-sm);
      min-width: 160px;
      text-align: center;
      box-shadow: 0 4px 14px rgba(176, 38, 255, 0.5);
      transition: all 0.3s;
    }
    .btn-primary:hover {
      background: var(--secondary);
      color: #0A0A0F;
      box-shadow: 0 0 24px rgba(0,240,255,0.8);
    }

    .btn-secondary {
      display: inline-block;
      background: transparent;
      color: var(--secondary);
      border: 2px solid var(--secondary);
      font-weight: 700;
      letter-spacing: 0.05em;
      text-transform: uppercase;
      padding: 0.85rem 2.1rem;
      border-radius: var(--radius-sm);
      min-width: 160px;
      text-align: center;
      transition: all 0.3s;
    }
    .btn-secondary:hover {
      background: var(--secondary);
      color: #0A0A0F;
      box-shadow: 0 0 20px var(--secondary-glow);
    }

    /* ---------- 结构区块 ---------- */
    section {
      padding: 6rem 0;
      scroll-margin-top: 80px;
    }

    @media (max-width: 1024px) {
      section { padding: 4rem 0; }
    }
    @media (max-width: 768px) {
      section { padding: 3rem 0; }
      .container { padding: 0 1.5rem; }
    }

    /* ---------- Hero ---------- */
    .hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      overflow: hidden;
    }
    .hero-bg-grid {
      position: absolute;
      inset: 0;
      background: linear-gradient(rgba(176,38,255,0.15) 1px, transparent 1px),
                  linear-gradient(90deg, rgba(176,38,255,0.15) 1px, transparent 1px);
      background-size: 60px 60px;
      transform: perspective(600px) rotateX(20deg);
      mask-image: linear-gradient(to bottom, black 40%, transparent 90%);
      z-index: 0;
    }
    .hero-glow1 {
      position: absolute;
      top: -20%;
      left: -10%;
      width: 534px;
      height: 400px;
      background: radial-gradient(circle, rgba(176,38,255,0.4) 0%, transparent 70%);
      filter: blur(100px);
      animation: floatGlow 8s infinite alternate;
    }
    .hero-glow2 {
      position: absolute;
      bottom: -15%;
      right: -10%;
      width: 500px;
      height: 380px;
      background: radial-gradient(circle, rgba(0,240,255,0.3) 0%, transparent 70%);
      filter: blur(110px);
      animation: floatGlow2 10s infinite alternate;
    }
    @keyframes floatGlow {
      0% { transform: translate(0,0) scale(1); }
      100% { transform: translate(30px,40px) scale(1.1); }
    }
    @keyframes floatGlow2 {
      0% { transform: translate(0,0) scale(1); }
      100% { transform: translate(-60px,30px) scale(1.15); }
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 800px;
      text-align: left;
    }
    .hero h1 {
      font-size: clamp(3rem, 8vw, 5.5rem);
      font-weight: 900;
      letter-spacing: -0.02em;
      text-transform: uppercase;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      background-clip: text;
      color: transparent;
      line-height: 1.1;
    }
    .hero-sub {
      font-size: 1.25rem;
      color: var(--text-body);
      margin: 1.5rem 0 2.5rem;
      max-width: 620px;
    }
    .hero-buttons {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }

    @media (max-width: 768px) {
      .hero-content { text-align: center; }
      .hero-sub { margin-left: auto; margin-right: auto; }
      .hero-buttons { justify-content: center; }
    }

    /* ---------- 卡片与网格 ---------- */
    .section-title {
      font-size: clamp(2rem, 5vw, 3rem);
      font-weight: 700;
      margin-bottom: 1rem;
    }
    .section-desc {
      color: var(--text-muted);
      max-width: 700px;
      margin-bottom: 3rem;
    }
    .grid-3, .grid-4 {
      display: grid;
      gap: 2rem;
    }
    .grid-3 { grid-template-columns: repeat(3,1fr); }
    .grid-4 { grid-template-columns: repeat(4,1fr); }
    @media (max-width: 1024px) {
      .grid-3, .grid-4 { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .grid-3, .grid-4 { grid-template-columns: 1fr; }
    }

    .pain-card, .solution-card {
      background: var(--surface);
      backdrop-filter: blur(12px);
      border: 1px solid var(--border-dim);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .pain-card:hover, .solution-card:hover {
      transform: translateY(-6px);
      border-color: var(--secondary);
      box-shadow: var(--shadow-glow);
    }
    .pain-card { border-left: 5px solid var(--accent); }

    .solution-icon {
      width: 56px;
      height: 56px;
      background: rgba(176,38,255,0.2);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.3rem;
      color: var(--secondary);
      font-size: 1.7rem;
    }

    /* ---------- 数据成果 ---------- */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      text-align: center;
      flex-wrap: wrap;
      gap: 2rem;
    }
    .stat-item .stat-num {
      font-size: 3rem;
      font-weight: 900;
      color: var(--secondary);
      display: block;
    }
    .divider-line {
      width: 100%;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--primary), transparent);
      margin: 3rem 0;
    }

    /* ---------- 证言滚动 ---------- */
    .testimonial-scroll {
      display: flex;
      gap: 2rem;
      overflow-x: auto;
      padding-bottom: 1rem;
      scroll-snap-type: x mandatory;
      -webkit-overflow-scrolling: touch;
    }
    .testimonial-scroll::-webkit-scrollbar { display: none; }
    .testimonial-card {
      min-width: 300px;
      flex: 0 0 32%;
      background: var(--surface);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-card);
      padding: 2rem;
      border: 1px solid var(--border-dim);
      scroll-snap-align: start;
      position: relative;
    }
    .quote-mark {
      font-size: 4rem;
      position: absolute;
      top: -10px;
      left: 18px;
      color: var(--primary);
      opacity: 0.35;
    }
    @media (max-width: 768px) {
      .testimonial-scroll { flex-direction: column; }
      .testimonial-card { min-width: auto; }
    }

    /* ---------- FAQ 手风琴 ---------- */
    .faq-item {
      background: var(--surface-solid);
      margin-bottom: 1rem;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-dim);
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      padding: 1.2rem 1.8rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: white;
      font-size: 1.1rem;
      background: transparent;
      transition: 0.3s;
    }
    .faq-question:hover { color: var(--secondary); }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.3s;
      background: #1A1A2E;
      padding: 0 1.8rem;
      color: var(--text-body);
    }
    .faq-item.active .faq-answer {
      max-height: 220px;
      padding: 1.2rem 1.8rem;
    }
    .faq-icon {
      font-size: 1.7rem;
      transition: 0.3s;
      color: var(--secondary);
    }

    /* ---------- 最终CTA ---------- */
    .cta-final {
      background: linear-gradient(135deg, #B026FF, #00F0FF);
      padding: 4rem 2rem;
      border-radius: var(--radius-card);
      text-align: center;
      position: relative;
    }
    .cta-final h2 {
      color: white;
      text-shadow: 0 2px 10px black;
    }

    /* ---------- 页脚 ---------- */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr; }
    }
    .footer-bottom {
      border-top: 1px solid var(--primary);
      margin-top: 2.5rem;
      padding-top: 1.8rem;
      text-align: center;
      color: var(--text-body);
    }