/* roulang page: index */
:root {
      --deep-teal: #1B3A3A;
      --copper-gold: #C49A6C;
      --warm-limestone: #F7F5F0;
      --ink-brown: #2C2416;
      --dark-vermillion: #B5452C;
      --white: #FFFFFF;
      --border-soft: #E5DDD2;
      --shadow-sm: 0 2px 12px rgba(27,58,58,0.06);
      --shadow-md: 0 8px 24px rgba(27,58,58,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-chip: 20px;
      --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-inter: "Inter", "Segoe UI", sans-serif;
      --transition: 0.25s ease;
      --max-width: 1200px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-limestone);
      color: var(--ink-brown);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-family: var(--font-sans);
      margin-top: 0;
    }

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

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding-left: 1.5rem;
      padding-right: 1.5rem;
    }

    /* 导航栏 */
    .nav-bar {
      background: var(--white);
      height: 70px;
      box-shadow: 0 1px 4px rgba(0,0,0,0.04);
      position: sticky;
      top: 0;
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 2rem;
    }

    .nav-logo {
      font-size: 1.4rem;
      font-weight: 700;
      color: var(--deep-teal);
      display: flex;
      align-items: center;
      gap: 0.5rem;
      white-space: nowrap;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--deep-teal);
      clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
      transform: rotate(15deg);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      flex-wrap: wrap;
    }

    .nav-chip {
      background: transparent;
      color: var(--deep-teal);
      padding: 0.4rem 1rem;
      border-radius: var(--radius-chip);
      font-size: 0.9rem;
      font-weight: 500;
      transition: var(--transition);
      display: inline-block;
    }

    .nav-chip:hover, .nav-chip.active {
      background: rgba(27,58,58,0.08);
      color: var(--deep-teal);
    }

    .nav-cta {
      margin-left: 2rem;
      padding-left: 1.5rem;
      border-left: 1px solid var(--border-soft);
    }

    .btn-primary {
      background: var(--copper-gold);
      color: var(--ink-brown);
      padding: 0.65rem 1.8rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: var(--transition);
      display: inline-block;
      text-align: center;
      box-shadow: 0 2px 6px rgba(196,154,108,0.25);
    }

    .btn-primary:hover {
      background: #B07D4F;
      color: var(--ink-brown);
      transform: translateY(-1px);
      box-shadow: 0 6px 14px rgba(196,154,108,0.35);
    }

    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--deep-teal);
      cursor: pointer;
    }

    @media (max-width: 1024px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 1.5rem;
        box-shadow: var(--shadow-md);
        gap: 0.8rem;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-cta {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        width: 100%;
      }
      .hamburger {
        display: block;
      }
      .nav-bar {
        padding: 0 1.5rem;
      }
    }

    /* Hero */
    .hero {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(27,58,58,0.85) 0%, rgba(27,40,40,0.75) 100%);
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 720px;
    }

    .hero h1 {
      font-size: clamp(2.8rem, 5vw, 4.2rem);
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1.2rem;
      letter-spacing: -0.02em;
    }

    .hero-sub {
      font-size: 1.2rem;
      opacity: 0.9;
      margin-bottom: 2.5rem;
      line-height: 1.6;
    }

    .btn-outline-light {
      border: 2px solid white;
      color: white;
      background: transparent;
      padding: 0.7rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      margin-left: 1rem;
      transition: var(--transition);
    }

    .btn-outline-light:hover {
      background: rgba(255,255,255,0.15);
      color: white;
    }

    @media (max-width: 640px) {
      .hero {
        min-height: 70vh;
        text-align: center;
      }
      .hero-content {
        margin: 0 auto;
      }
      .btn-outline-light {
        display: block;
        margin: 1rem auto 0;
        width: fit-content;
      }
    }

    /* 通用区块 */
    .section {
      padding: 5rem 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      margin-bottom: 1rem;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      position: absolute;
      bottom: -8px;
      left: 0;
      width: 50px;
      height: 4px;
      background: var(--copper-gold);
      border-radius: 2px;
    }

    .text-center .section-title::after {
      left: 50%;
      transform: translateX(-50%);
    }

    .bg-white {
      background: var(--white);
    }

    .bg-limestone {
      background: var(--warm-limestone);
    }

    /* 痛点卡片 */
    .pain-card {
      background: var(--white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      overflow: hidden;
      border: 1px solid var(--border-soft);
      height: 100%;
    }

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

    .pain-img {
      height: 180px;
      object-fit: cover;
      width: 100%;
    }

    .pain-body {
      padding: 1.8rem;
    }

    /* 解决方案图文交替 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 2.5rem;
      margin-bottom: 4rem;
    }

    .solution-img {
      flex: 1;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .solution-text {
      flex: 1;
    }

    .text-link {
      color: var(--copper-gold);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 0.3rem;
      transition: var(--transition);
    }

    .text-link:hover {
      text-decoration: underline;
      color: #B07D4F;
    }

    @media (max-width: 768px) {
      .solution-row {
        flex-direction: column;
      }
      .solution-row.reverse {
        flex-direction: column-reverse;
      }
    }

    /* 成果数字 */
    .metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 2rem;
    }

    .metric-number {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--copper-gold);
      line-height: 1.2;
    }

    .metric-label {
      color: var(--deep-teal);
      font-weight: 500;
    }

    @media (max-width: 768px) {
      .metric-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 520px) {
      .metric-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 证言卡片 */
    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      border-left: 5px solid var(--copper-gold);
      transition: var(--transition);
    }

    .testimonial-card:hover {
      box-shadow: var(--shadow-md);
    }

    .testimonial-avatar {
      width: 60px;
      height: 60px;
      border-radius: 50%;
      object-fit: cover;
      margin-right: 1rem;
    }

    /* FAQ */
    .accordion-title {
      background: var(--warm-limestone);
      font-weight: 600;
      font-size: 1.1rem;
      padding: 1rem 1.5rem;
      border-radius: 8px;
      margin-bottom: 4px;
    }

    .accordion-content {
      background: white;
      padding: 1.2rem 1.5rem;
      border-radius: 0 0 8px 8px;
    }

    /* 终局 CTA */
    .cta-dark {
      background: var(--deep-teal);
      color: white;
      text-align: center;
    }

    .btn-cta-large {
      background: var(--dark-vermillion);
      color: white;
      padding: 1rem 2.8rem;
      font-size: 1.2rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      transition: var(--transition);
      border: none;
    }

    .btn-cta-large:hover {
      background: #9A3822;
      transform: scale(1.03);
      color: white;
    }

    /* 页脚 */
    .footer {
      background: #1e1a14;
      color: #cfc7b9;
      padding: 3rem 0;
    }

    .footer a {
      color: #cfc7b9;
    }

    .footer a:hover {
      color: var(--copper-gold);
    }

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

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 520px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    .footer-bottom {
      border-top: 1px solid #3a3329;
      margin-top: 2rem;
      padding-top: 1.5rem;
      text-align: center;
      font-size: 0.85rem;
    }