/* roulang page: index */
:root {
      --primary-deep: #1A2F2B;
      --primary-dark: #0F1A17;
      --accent-orange: #FF5E13;
      --accent-light: #FF8A4C;
      --neutral-bg: #F5F7F6;
      --neutral-gray: #8A9A96;
      --neutral-border: #C5D0CC;
      --text-white: #FFFFFF;
      --text-primary: #1A2F2B;
      --text-body: rgba(26, 47, 43, 0.85);
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --shadow-glow: 0 0 20px rgba(255, 94, 19, 0.6);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --transition: all 0.25s ease-in-out;
      --content-width: 1200px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: var(--font-body);
      line-height: 1.7;
      color: var(--text-primary);
      background-color: #fefefe;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    img {
      display: block;
      max-width: 100%;
      height: auto;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-heading);
      font-weight: 700;
      display: inline-block;
      border: none;
      background: none;
      transition: var(--transition);
    }
    input, textarea {
      font-family: var(--font-body);
      border-radius: var(--radius-input);
      border: 1px solid var(--neutral-border);
      padding: 0.75rem 1rem;
      width: 100%;
      transition: var(--transition);
    }
    input:focus, textarea:focus {
      outline: 2px solid var(--accent-orange);
      border-color: transparent;
      box-shadow: 0 0 8px rgba(255,94,19,0.3);
    }
    .container {
      max-width: var(--content-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 2rem;
      padding-right: 2rem;
    }
    @media (max-width: 1024px) {
      .container{padding-left: 1.5rem; padding-right: 1.5rem;}
    }
    @media (max-width: 768px) {
      .container{padding-left: 1rem; padding-right: 1rem;}
    }

    /* 导航 ---------- */
    header.site-header {
      position: fixed;
      top: 0; left: 0; width: 100%;
      z-index: 1000;
      background: rgba(26, 47, 43, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      transition: var(--transition);
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    header.scrolled {
      background: #1A2F2B;
      box-shadow: 0 10px 25px -15px rgba(0,0,0,0.5);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 1.7rem;
      letter-spacing: -0.5px;
      color: white;
      display: flex;
      align-items: center;
      gap: 0.25rem;
    }
    .logo span {
      color: var(--accent-orange);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2.2rem;
    }
    .nav-links a {
      color: rgba(255,255,255,0.9);
      font-weight: 600;
      font-size: 0.95rem;
      letter-spacing: 0.3px;
      padding: 0.2rem 0;
      position: relative;
    }
    .nav-links a:hover {
      color: white;
      text-shadow: 0 0 8px rgba(255,94,19,0.49);
    }
    .nav-btn {
      background: var(--accent-orange);
      color: white !important;
      padding: 0.6rem 1.6rem !important;
      border-radius: var(--radius-btn);
      transition: var(--transition);
      font-weight: 700;
      margin-left: 0.8rem;
    }
    .nav-btn:hover {
      background: var(--accent-light);
      box-shadow: 0 8px 20px rgba(255,94,19,0.25);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 26px;
      height: 3px;
      background: white;
      border-radius: 4px;
      transition: var(--transition);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px; left:0; width:100%; height:100vh;
      background: #1A2F2B;
      flex-direction: column;
      align-items: center; justify-content: center;
      gap: 2rem;
      z-index: 999;
    }
    .mobile-menu.active {
      display: flex;
    }
    .mobile-menu a {
      color: white;
      font-size: 1.6rem;
      font-weight: 600;
    }
    @media (max-width: 1024px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
    }

    /* 板块标题 */
    .section-title {
      font-family: var(--font-heading);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary-deep);
      margin-bottom: 1rem;
      letter-spacing: -0.4px;
      position: relative;
    }
    .section-subtitle {
      color: var(--neutral-gray);
      font-size: 1.1rem;
      max-width: 700px;
      margin-bottom: 2.5rem;
    }
    @media (max-width: 768px){
      .section-title{font-size:1.8rem;}
    }

    /* 首屏 Hero */
    .hero {
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding: 150px 0 100px;
      color: white;
    }
    .hero-overlay {
      position: absolute; inset:0;
      background: linear-gradient(135deg, rgba(26,47,43,0.7) 0%, rgba(15,26,23,0.75) 100%);
    }
    .hero-content {
      position: relative;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 3rem;
      align-items: center;
    }
    .hero-text h1 {
      font-family: var(--font-heading);
      font-weight: 800;
      font-size: 3.4rem;
      line-height: 1.2;
      margin-bottom: 1.3rem;
      letter-spacing: -0.02em;
    }
    .hero-text p {
      font-size: 1.2rem;
      margin-bottom: 2rem;
      opacity: 0.92;
      font-weight: 400;
    }
    .hero-btns {
      display: flex;
      gap: 1.2rem;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: #FF5E13;
      color: white;
      padding: 0.8rem 2.4rem;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: 0 8px 24px rgba(255,94,19,0.4);
    }
    .btn-primary:hover{
      background: #ff7a2e;
      box-shadow: var(--shadow-glow);
    }
    .btn-outline-light {
      border: 1.5px solid white;
      color: white;
      background: transparent;
      padding: 0.8rem 2.2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
    }
    .btn-outline-light:hover{
      background: white;
      color: var(--primary-deep);
    }
    .hero-visual img {
      border-radius: 16px;
      box-shadow: 0 25px 40px -12px black;
    }
    @media (max-width: 1024px){
      .hero-content{grid-template-columns:1fr; text-align: center;}
      .hero-btns{justify-content: center;}
      .hero-text h1{font-size:2.8rem;}
    }

    /* 核心方案卡片 */
    .features {
      padding: 90px 0;
      background: var(--neutral-bg);
    }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .feature-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem 1.8rem 2rem;
      border-left: 4px solid var(--accent-orange);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .feature-card:hover{
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .feature-img {
      height: 150px;
      background-size: cover;
      background-position: center;
      border-radius: 8px;
      margin-bottom: 1.2rem;
      position: relative;
      overflow: hidden;
    }
    .feature-img::after {
      content: '';
      position: absolute; inset:0;
      background: linear-gradient(0deg, rgba(26,47,43,0.4) 0%, transparent 55%);
    }
    .feature-card h3 {
      font-weight: 700;
      font-size: 1.3rem;
      margin-bottom: 0.8rem;
    }
    .feature-card p {
      color: var(--text-body);
    }
    @media (max-width: 1024px){
      .features-grid{grid-template-columns:repeat(2,1fr);}
    }
    @media(max-width:640px){
      .features-grid{grid-template-columns:1fr;}
    }

    /* 数据展示 */
    .stats-panel {
      background: #0F1A17;
      padding: 70px 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      text-align: center;
      gap: 2rem;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--accent-orange);
      font-family: var(--font-heading);
      margin-bottom: 0.5rem;
    }
    .stat-label {
      color: #C5D0CC;
      font-weight: 500;
    }
    @media (max-width:768px){
      .stats-grid{grid-template-columns:repeat(2,1fr);}
    }

    /* 证言 */
    .testimonials {
      padding: 90px 0;
    }
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 28px;
    }
    .testimonial-item {
      background: #F5F7F6;
      padding: 2rem;
      border-radius: var(--radius-card);
      position: relative;
    }
    .testimonial-item blockquote {
      font-style: italic;
      margin-bottom: 1.4rem;
      color: var(--primary-deep);
      font-size: 1.1rem;
    }
    .author {
      font-weight: 700;
    }
    @media(max-width:768px){.testimonial-grid{grid-template-columns:1fr;}}

    /* FAQ */
    .faq {
      padding: 80px 0;
      background: var(--neutral-bg);
    }
    .faq-item {
      border-bottom: 1px solid var(--neutral-border);
      padding: 1.2rem 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 700;
      font-size: 1.2rem;
      cursor: pointer;
      color: var(--primary-deep);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: 0.3s;
      color: #3a4b47;
    }
    .faq-item.active .faq-answer {
      max-height: 180px;
      padding-top: 1rem;
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(135deg, #1A2F2B, #0F1A17);
      padding: 80px 20px;
      text-align: center;
    }
    .cta-btn{
      margin-top: 2rem;
      display: inline-block;
    }
    footer {
      background: #0F1A17;
      color: #8A9A96;
      padding: 60px 0 25px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
    }
    @media(max-width:900px){.footer-grid{grid-template-columns:1fr 1fr;}}
    @media(max-width:500px){.footer-grid{grid-template-columns:1fr;}}