/* roulang page: index */
:root {
      --primary-black: #1A1A1A;
      --vivid-green: #0F9B4E;
      --warm-orange: #F05423;
      --neutral-bg: #F7F8FA;
      --pure-white: #FFFFFF;
      --deep-bg: #2C2C2C;
      --text-main: #1A1A1A;
      --text-body: #444444;
      --text-muted: #777777;
      --border-light: #E5E7EB;
      --radius-card: 12px;
      --radius-btn: 8px;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --transition-base: all 0.25s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--pure-white);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航系统 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(26, 26, 26, 0.85);
      backdrop-filter: blur(12px);
      transition: var(--transition-base);
      border-bottom: 1px solid transparent;
    }

    .site-header.scrolled {
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.5rem;
      color: white;
      letter-spacing: -0.5px;
      transition: var(--transition-base);
    }

    .site-header.scrolled .logo {
      color: var(--primary-black);
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--vivid-green);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      position: relative;
    }

    .logo-icon::before {
      content: "🐼";
      filter: grayscale(0);
      transform: scale(0.9);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 0.95rem;
      color: rgba(255,255,255,0.85);
      position: relative;
      padding: 4px 0;
    }

    .site-header.scrolled .nav-links a {
      color: var(--text-main);
    }

    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--vivid-green);
      transition: width 0.2s ease;
    }

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

    .btn-primary {
      background: var(--vivid-green);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      transition: var(--transition-base);
      box-shadow: 0 2px 8px rgba(15,155,78,0.3);
      font-size: 0.95rem;
    }

    .btn-primary:hover {
      background: #0B7A3D;
      box-shadow: 0 0 0 4px rgba(15,155,78,0.2);
      transform: translateY(-1px);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid white;
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      transition: var(--transition-base);
      display: inline-flex;
      align-items: center;
    }

    .btn-outline:hover {
      background: white;
      color: var(--primary-black);
    }

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

    .hamburger span {
      width: 24px;
      height: 2px;
      background: white;
      transition: 0.2s;
    }

    .site-header.scrolled .hamburger span {
      background: var(--primary-black);
    }

    /* Hero */
    .hero {
      background: var(--primary-black);
      color: white;
      padding: 140px 0 100px;
      position: relative;
      overflow: hidden;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      background-blend-mode: overlay;
      min-height: 85vh;
      display: flex;
      align-items: center;
    }

    .hero::before {
      content: "";
      position: absolute;
      inset: 0;
      background: rgba(26,26,26,0.7);
      z-index: 0;
    }

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

    .hero h1 {
      font-size: 3.25rem;
      font-weight: 700;
      line-height: 1.2;
      color: white;
      margin-bottom: 24px;
    }

    .hero p {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.8);
      margin-bottom: 32px;
      max-width: 90%;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-image {
      background: rgba(255,255,255,0.05);
      border-radius: 24px;
      overflow: hidden;
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.1);
    }

    /* 板块通用 */
    section {
      padding: 90px 0;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--primary-black);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .section-title::before {
      content: "";
      width: 6px;
      height: 32px;
      background: var(--vivid-green);
      border-radius: 4px;
      display: inline-block;
    }

    .section-sub {
      color: var(--text-muted);
      margin-bottom: 48px;
      font-size: 1.1rem;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .card {
      background: var(--pure-white);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-base);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    /* 痛点卡片红色细线 */
    .pain-card {
      background: #F9FAFB;
      border-left: 4px solid #F05423;
      border-radius: 8px;
    }

    .solution-card {
      border-top: 4px solid transparent;
      transition: 0.2s;
    }
    .solution-card:hover {
      border-top-color: var(--vivid-green);
    }

    .feature-img {
      height: 180px;
      background: #EFF6F0;
      border-radius: 12px 12px 0 0;
      margin: -32px -32px 24px -32px;
      overflow: hidden;
    }

    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    .step-item {
      text-align: center;
      flex:1;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--vivid-green);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 12px;
    }

    .testimonial-bg {
      background: var(--deep-bg);
      color: white;
    }
    .big-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--warm-orange);
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }

    .cta-full {
      background: var(--deep-bg);
      text-align: center;
    }

    footer {
      background: #1A1A1A;
      color: #CCC;
      padding: 60px 0 20px;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .hero .container { grid-template-columns: 1fr; }
      .process-steps { flex-direction: column; gap: 24px; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .grid-3 { grid-template-columns: 1fr; }
      .hero h1 { font-size: 2.2rem; }
    }