/* roulang page: index */
:root {
      --brand-orange: #FF6B00;
      --deep-black: #1A1A1A;
      --cyan: #00E5FF;
      --text-white: #FFFFFF;
      --text-gray: #B3B3B3;
      --text-light-gray: #999999;
      --card-bg: #242424;
      --card-bg-alt: #2E2E2E;
      --card-border: #333333;
      --floating-black: #212121;
      --radius-sm: 6px;
      --radius-md: 10px;
      --border-thin: 1px solid #333;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: 'Inter', 'Noto Sans SC', sans-serif;
      background-color: var(--deep-black);
      color: var(--text-white);
      line-height: 1.7;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    
    .container {
      max-width: 1300px;
      margin: 0 auto;
      padding: 0 32px;
    
    a {
      text-decoration: none;
      color: inherit;
    
    img {
      max-width: 100%;
      display: block;
    
    /* ---------- 排版组件 ---------- */
    .section-title {
      font-family: 'Montserrat', 'Noto Sans SC', sans-serif;
      font-weight: 700;
      font-size: clamp(2.2rem, 5vw, 3.2rem);
      margin-bottom: 1.25rem;
      letter-spacing: -0.2px;
      line-height: 1.2;
    
    .section-subtitle {
      color: var(--text-gray);
      font-size: 1.15rem;
      max-width: 700px;
      margin: 0 auto 3rem auto;
      text-align: center;
    
    .text-accent-cyan {
      color: var(--cyan);
    
    .text-accent-orange {
      color: var(--brand-orange);
    
    /* 装饰用青蓝色下划线 */
    .title-underline {
      display: inline-block;
      width: 70px;
      height: 4px;
      background: var(--cyan);
      margin-bottom: 0.75rem;
    
    /* ---------- 按钮 ---------- */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      font-size: 1rem;
      letter-spacing: 0.3px;
      border-radius: 6px;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      padding: 0.9rem 2rem;
      white-space: nowrap;
    
    .btn-primary {
      background: var(--brand-orange);
      color: white;
      box-shadow: 0 8px 20px rgba(255, 107, 0, 0.3);
    
    .btn-primary:hover {
      background: #FF8C33;
      box-shadow: 0 15px 30px rgba(255, 107, 0, 0.4);
      transform: translateY(-2px);
      filter: brightness(1.1);
    
    .btn-outline-cyan {
      background: transparent;
      border: 2px solid var(--cyan);
      color: var(--cyan);
      box-shadow: 0 0 0 rgba(0, 229, 255, 0);
    
    .btn-outline-cyan:hover {
      background: var(--cyan);
      color: #1A1A1A;
      box-shadow: 0 10px 25px rgba(0, 229, 255, 0.3);
      transform: translateY(-2px);
    
    .btn-black {
      background: var(--deep-black);
      color: white;
      border: 2px solid var(--deep-black);
    
    .btn-black:hover {
      background: white;
      color: var(--deep-black);
    
    /* ---------- NAVIGATION ---------- */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      backdrop-filter: blur(12px);
      background: rgba(26, 26, 26, 0.8);
      transition: background 0.3s ease, box-shadow 0.3s ease;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    
    .header.scrolled {
      background: #1A1A1A;
      box-shadow: 0 8px 24px rgba(0,0,0,0.5);
    
    .nav-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 18px 32px;
      height: 72px;
      max-width: 1300px;
      margin: 0 auto;
    
    .logo a {
      font-family: 'Montserrat', 'Noto Sans SC', sans-serif;
      font-weight: 800;
      font-size: 1.9rem;
      letter-spacing: 0.5px;
      background: linear-gradient(135deg, #fff 0%, #ddd 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: inline-block;
    
    .nav-links {
      display: flex;
      gap: 2.5rem;
      align-items: center;
      list-style: none;
    
    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: var(--text-gray);
      transition: color 0.2s;
      position: relative;
    
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--text-white);
    
    .nav-cta .btn {
      padding: 0.6rem 1.5rem;
      font-size: 0.9rem;
    
    .hamburger {
      display: none;
      background: transparent;
      border: none;
      color: white;
      font-size: 1.9rem;
      cursor: pointer;
    
    /* 移动菜单 */
    .mobile-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: #111111;
      z-index: 999;
      display: none;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      text-align: center;
    
    .mobile-menu.active {
      display: flex;
    
    .mobile-menu a {
      color: white;
      font-size: 1.8rem;
      margin: 0.9rem 0;
      font-weight: 600;
    
    .close-menu {
      position: absolute;
      top: 25px;
      right: 32px;
      background: none;
      border: none;
      color: white;
      font-size: 2.2rem;
      cursor: pointer;
    
    /* ---------- HERO ---------- */
    .hero {
      height: 100vh;
      max-height: 900px;
      min-height: 740px;
      display: flex;
      align-items: center;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 30% 40%, #2E2A26 0%, #161616 85%);
    
    .hero .hero-bg {
      position: absolute;
      inset: 0;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.48;
      z-index: 0;
      mix-blend-mode: overlay;
    
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(130deg, rgba(26,26,26,0.7) 30%, rgba(0,229,255,0.12) 100%);
      z-index: 1;
    
    .hero-content {
      position: relative;
      z-index: 3;
      max-width: 800px;
    
    .hero h1 {
      font-family: 'Montserrat', 'Noto Sans SC', sans-serif;
      font-weight: 800;
      font-size: clamp(3rem, 7vw, 5.3rem);
      line-height: 1.05;
      margin-bottom: 1.5rem;
    
    .hero p {
      font-size: 1.35rem;
      color: #c0c0c0;
      max-width: 580px;
      margin-bottom: 2.6rem;
    
    .cta-group {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    
    /* ---------- PAIN POINTS ---------- */
    .pain-section {
      padding: 6rem 0 4rem;
    
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
      margin-top: 2rem;
    
    .pain-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 2rem 1.8rem;
      border: var(--border-thin);
      border-left: 6px solid var(--cyan);
      transition: all 0.2s;
    
    .pain-card:hover {
      border-color: var(--cyan);
      transform: translateY(-6px);
      box-shadow: 0 20px 30px -14px rgba(0,229,255,0.25);
    
    .pain-card h3 {
      font-family: 'Montserrat', sans-serif;
      font-size: 1.5rem;
      margin: 1rem 0 0.6rem;
      color: white;
    
    /* ---------- SOLUTIONS 非对称图文 ---------- */
    .solutions {
      padding: 5rem 0;
    
    .solution-row {
      display: flex;
      gap: 45px;
      align-items: center;
      margin-bottom: 5.5rem;
      flex-wrap: wrap;
    
    .solution-row.reverse {
      flex-direction: row-reverse;
    
    .solution-img {
      background: #2C2C2C;
      border-radius: var(--radius-md);
      overflow: hidden;
      flex: 1 1 42%;
      min-height: 320px;
    
    .solution-img img {
      height: 100%;
      object-fit: cover;
      width: 100%;
    
    .solution-text {
      flex: 1 1 48%;
    
    .solution-text h4 {
      font-size: 2rem;
      color: var(--cyan);
      margin-bottom: 1.2rem;
      font-weight: 700;
    
    /* ---------- RESULTS COUNTERS ---------- */
    .results {
      padding: 5rem 0;
      text-align: center;
    
    .counter-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      margin-top: 2.8rem;
    
    .counter-item {
      min-width: 200px;
    
    .counter-value {
      font-family: 'Montserrat', sans-serif;
      font-size: 4rem;
      font-weight: 700;
      color: var(--cyan);
    
    /* ---------- TESTIMONIALS ---------- */
    .testimonials {
      padding: 5rem 0;
    
    .testimonial-carousel {
      display: flex;
      gap: 30px;
      overflow-x: auto;
      padding-bottom: 1rem;
    
    .testimonial-card {
      background: var(--card-bg-alt);
      border-radius: var(--radius-md);
      padding: 2.5rem 2rem;
      min-width: 320px;
      flex: 1;
    
    .testimonial-card p {
      font-style: italic;
      color: #ddd;
    }
    
    /* ---------- FAQ ---------- */
    .faq {
      padding: 5rem 0;
    
    .faq-list {
      max-width: 850px;
      margin: 0 auto;
    
    .faq-item {
      border-top: var(--border-thin);
      padding: 1.4rem 0;
    
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    
    .faq-answer {
      color: var(--text-gray);
      margin-top: 0.7rem;
      display: none;
    
    .faq-item.active .faq-answer {
      display: block;
    
    /* ---------- CTA ---------- */
    .cta-section {
      background: linear-gradient(135deg, var(--cyan) 0%, var(--brand-orange) 100%);
      padding: 4.5rem 0;
      text-align: center;
      color: #0a0a0a;
    
    /* ---------- FOOTER ---------- */
    .footer {
      background: #111111;
      padding: 4rem 0 1.8rem;
      color: var(--text-light-gray);
    
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
      margin-bottom: 2rem;
    
    .copyright {
      border-top: 1px solid #2A2A2A;
      padding-top: 2rem;
      text-align: center;
      font-size: 0.85rem;
    
    @media (max-width: 1024px) {
      .pain-grid { grid-template-columns: repeat(2,1fr); }
    
    @media (max-width: 800px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .pain-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .solution-row { flex-direction: column; }
    }