:root {
    --primary: #4E6EF2;
    --primary-dark: #3B5BE5;
    --primary-light: #EEF2FF;
    --purple: #7B4EF2;
    --text: #222226;
    --text-2: #626675;
    --text-3: #9195A3;
    --border: #E8E9EC;
    --bg: #FFFFFF;
    --bg-soft: #F7F8FC;
    --wechat: #09BB07;
    --alipay: #1677FF;
    --radius: 16px;
    --shadow: 0 4px 20px rgba(30, 45, 90, 0.07);
    --shadow-hover: 0 10px 32px rgba(78, 110, 242, 0.18);
  }

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

  html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

  body {
    font-family: -apple-system, BlinkMacSystemFont, "Microsoft YaHei", "PingFang SC",
                 "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    overflow-x: hidden;
  }

  img { max-width: 100%; display: block; }
  a { color: inherit; text-decoration: none; }

  .container {
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
  }

  /* ============ 顶部导航 ============ */
  .navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
  }
  .nav-inner {
    height: 64px;
    display: flex;
    align-items: center;
  }
  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
  }
  .brand img { width: 36px; height: 36px; }
  .brand-text {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 0.5px;
    background: linear-gradient(135deg, #4E6EF2 0%, #7B4EF2 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }
  .brand-domain {
    font-size: 11px;
    color: var(--text-3);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 1px 8px;
    background: #FAFBFD;
  }
  .nav-links {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: auto;
  }
  .nav-links a {
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 14.5px;
    color: var(--text-2);
    transition: all 0.2s;
    white-space: nowrap;
  }
  .nav-links a:hover { color: var(--primary); background: var(--primary-light); }
  .nav-download {
    background: var(--primary);
    color: #fff !important;
    padding: 8px 20px !important;
    font-weight: 600;
  }
  .nav-download:hover { background: var(--primary-dark) !important; }

  .nav-toggle {
    display: none;
    margin-left: auto;
    width: 40px; height: 40px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: #fff;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
  }
  .nav-toggle i {
    display: block;
    width: 18px; height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all 0.25s;
  }
  .nav-toggle.open i:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle.open i:nth-child(2) { opacity: 0; }
  .nav-toggle.open i:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  /* ============ 首屏 ============ */
  .hero {
    position: relative;
    padding: 72px 0 64px;
    overflow: hidden;
  }
  .hero::before {
    content: "";
    position: absolute;
    top: -160px; right: -120px;
    width: 480px; height: 480px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(78,110,242,0.16), transparent 68%);
    pointer-events: none;
  }
  .hero::after {
    content: "";
    position: absolute;
    bottom: -200px; left: -140px;
    width: 460px; height: 460px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(123,78,242,0.14), transparent 68%);
    pointer-events: none;
  }
  .hero-grid {
    position: relative;
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 48px;
    align-items: center;
  }
  .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 20px;
    margin-bottom: 22px;
  }
  .hero h1 {
    font-size: 46px;
    line-height: 1.22;
    font-weight: 800;
    letter-spacing: 0.5px;
    margin-bottom: 20px;
  }
  .hero h1 .grad {
    background: linear-gradient(135deg, #4E6EF2 0%, #7B4EF2 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }
  .hero-sub {
    font-size: 17px;
    color: var(--text-2);
    margin-bottom: 32px;
    max-width: 520px;
  }
  .hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
  .btn {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 14px 30px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.22s;
    white-space: nowrap;
  }
  .btn-primary {
    background: linear-gradient(135deg, #4E6EF2 0%, #6A5CF2 100%);
    color: #fff;
    box-shadow: 0 6px 20px rgba(78, 110, 242, 0.32);
  }
  .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 28px rgba(78, 110, 242, 0.42); }
  .btn-ghost {
    background: #fff;
    color: var(--text);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
  }
  .btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
  .hero-tip {
    margin-top: 18px;
    font-size: 13px;
    color: var(--text-3);
  }

  /* 软件截图卡片 */
  .hero-shot {
    border-radius: 18px;
    overflow: hidden;
    box-shadow: 0 18px 48px rgba(30, 45, 90, 0.18);
    border: 1px solid var(--border);
    background: #fff;
  }
  .shot-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 11px 14px;
    background: #F2F3F7;
    border-bottom: 1px solid var(--border);
  }
  .shot-bar i {
    width: 11px; height: 11px; border-radius: 50%;
    display: block;
  }
  .shot-bar i:nth-child(1) { background: #FF5F57; }
  .shot-bar i:nth-child(2) { background: #FEBC2E; }
  .shot-bar i:nth-child(3) { background: #28C840; }
  .shot-url {
    margin-left: 10px;
    font-size: 12px;
    color: var(--text-3);
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 3px 14px;
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .shot-body { padding: 26px 26px 30px; }
  .shot-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 20px; }
  .shot-logo img { width: 34px; height: 34px; }
  .shot-logo b { font-size: 17px; }
  .shot-search {
    display: flex;
    align-items: center;
    border: 2px solid var(--primary);
    border-radius: 26px;
    padding: 4px 4px 4px 16px;
  }
  .shot-search input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 14px;
    background: transparent;
    color: var(--text-3);
    min-width: 0;
  }
  .shot-search button {
    border: none;
    background: var(--primary);
    color: #fff;
    font-size: 13px;
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: 600;
  }
  .shot-result {
    margin-top: 18px;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px 16px;
    background: var(--bg-soft);
  }
  .shot-result .r-name {
    color: #2440B3;
    font-weight: 600;
    font-size: 14.5px;
  }
  .shot-result .r-path {
    color: #00A46A;
    font-size: 12px;
    margin: 5px 0 7px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .shot-result .r-desc { color: var(--text-2); font-size: 12.5px; line-height: 1.6; }
  .shot-result .r-desc mark { background: #FFF1B8; color: #B25600; border-radius: 3px; padding: 0 2px; }

  /* ============ 通用区块 ============ */
  .section { padding: 72px 0; }
  .section-soft { background: var(--bg-soft); }
  .section-head { text-align: center; margin-bottom: 46px; }
  .section-head h2 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 12px;
  }
  .section-head p {
    color: var(--text-2);
    font-size: 15.5px;
    max-width: 560px;
    margin: 0 auto;
  }

  /* ============ 功能卡片 ============ */
  .features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
  }
  .feature-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 24px;
    box-shadow: var(--shadow);
    transition: all 0.25s;
  }
  .feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(78, 110, 242, 0.35);
  }
  .feature-icon {
    width: 48px; height: 48px;
    border-radius: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 23px;
    margin-bottom: 16px;
    background: var(--primary-light);
  }
  .feature-card h3 { font-size: 17.5px; margin-bottom: 8px; }
  .feature-card p { color: var(--text-2); font-size: 14px; }

  /* ============ 步骤 ============ */
  .steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
    counter-reset: step;
  }
  .step-card {
    position: relative;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 30px 24px 26px;
    box-shadow: var(--shadow);
  }
  .step-num {
    width: 40px; height: 40px;
    border-radius: 12px;
    background: linear-gradient(135deg, #4E6EF2 0%, #7B4EF2 100%);
    color: #fff;
    font-size: 18px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
  }
  .step-card h3 { font-size: 17px; margin-bottom: 8px; }
  .step-card p { color: var(--text-2); font-size: 14px; }

  /* ============ 格式支持 ============ */
  .formats {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    max-width: 760px;
    margin: 0 auto;
  }
  .format-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 10px 20px;
    font-size: 14px;
    color: var(--text-2);
    box-shadow: var(--shadow);
  }
  .format-chip .dot {
    width: 9px; height: 9px; border-radius: 50%;
  }
  .format-chip b { color: var(--text); }

  /* ============ 下载区 ============ */
  .download-card {
    background: linear-gradient(135deg, #4E6EF2 0%, #6A5CF2 100%);
    border-radius: 22px;
    padding: 48px 40px;
    text-align: center;
    color: #fff;
    box-shadow: 0 14px 40px rgba(78, 110, 242, 0.34);
  }
  .download-card h2 { font-size: 30px; margin-bottom: 12px; }
  .download-card p { font-size: 15.5px; opacity: 0.92; margin-bottom: 28px; }
  .btn-white {
    background: #fff;
    color: var(--primary);
    padding: 14px 34px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 9px;
    transition: all 0.22s;
    box-shadow: 0 6px 18px rgba(0,0,0,0.16);
  }
  .btn-white:hover { transform: translateY(-2px); box-shadow: 0 10px 26px rgba(0,0,0,0.22); }
  .download-meta {
    margin-top: 20px;
    font-size: 13px;
    opacity: 0.85;
  }

  /* ============ 赞助区 ============ */
  .sponsor-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 22px;
    box-shadow: var(--shadow);
    overflow: hidden;
    max-width: 920px;
    margin: 0 auto;
  }
  .sponsor-head {
    text-align: center;
    padding: 40px 24px 8px;
  }
  .sponsor-head .heart {
    width: 58px; height: 58px;
    border-radius: 18px;
    background: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 100%);
    color: #fff;
    font-size: 27px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    box-shadow: 0 8px 22px rgba(255, 107, 107, 0.32);
  }
  .sponsor-head h2 { font-size: 26px; margin-bottom: 10px; }
  .sponsor-head p { color: var(--text-2); font-size: 14.5px; max-width: 520px; margin: 0 auto; }

  .pay-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    padding: 30px 32px 36px;
  }
  .pay-card {
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 22px 18px 18px;
    text-align: center;
    transition: all 0.25s;
    background: #fff;
  }
  .pay-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 26px rgba(30, 45, 90, 0.10);
  }
  .pay-card .qr-wrap {
    position: relative;
    display: inline-block;
    padding: 10px;
    border-radius: 14px;
    background: #fff;
    border: 1px solid var(--border);
    margin-bottom: 14px;
  }
  .pay-card .qr-wrap img {
    width: 200px;
    height: 200px;
    border-radius: 8px;
  }
  .pay-card h3 {
    font-size: 16.5px;
    margin-bottom: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
  }
  .pay-tag {
    font-size: 11px;
    color: #fff;
    border-radius: 5px;
    padding: 1px 7px;
    font-weight: 700;
  }
  .tag-wechat { background: var(--wechat); }
  .tag-alipay { background: var(--alipay); }
  .pay-card p { font-size: 13px; color: var(--text-3); }

  /* 单赞赏码居中布局 */
  .reward-center {
    text-align: center;
    padding: 30px 24px 26px;
  }
  .qr-glow {
    display: inline-block;
    padding: 14px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid var(--border);
    box-shadow: 0 10px 34px rgba(78, 110, 242, 0.16);
    margin-bottom: 22px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  .qr-glow:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 16px 44px rgba(78, 110, 242, 0.26);
  }
  .qr-glow img {
    width: 232px;
    height: 232px;
    border-radius: 12px;
    display: block;
  }
  .reward-center h3 {
    font-size: 19px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
  }
  .reward-desc {
    color: var(--text-2);
    font-size: 14.5px;
    line-height: 1.8;
  }
  .contact-row a { color: var(--primary); }

  .sponsor-thanks {
    text-align: center;
    padding: 0 24px 34px;
    color: var(--text-3);
    font-size: 13.5px;
  }

  /* ============ 联系我们 ============ */
  .contact-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
  }
  .contact-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 30px 24px 26px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all 0.25s;
    color: var(--text);
  }
  .contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: rgba(78, 110, 242, 0.35);
  }
  .contact-ico-big {
    width: 52px; height: 52px;
    border-radius: 15px;
    background: var(--primary-light);
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
  }
  .contact-card h3 { font-size: 16px; margin-bottom: 8px; }
  .contact-card .contact-main {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 5px;
    word-break: break-all;
  }
  .contact-card .contact-sub { font-size: 13px; color: var(--text-3); }

  /* ============ 常见问题 ============ */
  .faq-list {
    max-width: 760px;
    margin: 0 auto;
  }
  .faq-item {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 14px;
    margin-bottom: 14px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: box-shadow 0.22s;
  }
  .faq-item:hover { box-shadow: var(--shadow-hover); }
  .faq-item summary {
    padding: 17px 22px;
    font-size: 15.5px;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
  }
  .faq-item summary::-webkit-details-marker { display: none; }
  .faq-item summary::after {
    content: "+";
    color: var(--primary);
    font-size: 20px;
    font-weight: 700;
    flex-shrink: 0;
    transition: transform 0.22s;
  }
  .faq-item[open] summary::after { transform: rotate(45deg); }
  .faq-item p {
    padding: 0 22px 18px;
    color: var(--text-2);
    font-size: 14px;
    line-height: 1.75;
  }

  /* ============ 页脚 ============ */
  .footer {
    background: #1D1F26;
    color: #9BA0AE;
    padding: 48px 0 30px;
    margin-top: 0;
  }
  .footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 36px;
    margin-bottom: 32px;
  }
  .footer-brand-row { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
  .footer-brand-row img {
    width: 26px !important;
    height: 26px !important;
    max-width: 26px !important;
    max-height: 26px !important;
    flex-shrink: 0;
    object-fit: contain;
  }
  .footer-brand-row .brand-text { font-size: 16px; }
  .footer p { font-size: 13.5px; line-height: 1.8; }
  .footer h4 {
    color: #E8EAF0;
    font-size: 14.5px;
    margin-bottom: 12px;
    font-weight: 600;
  }
  .footer ul { list-style: none; }
  .footer li { font-size: 13.5px; margin-bottom: 8px; }
  .footer li a:hover { color: var(--primary); }
  .footer-bottom {
    border-top: 1px solid #2E313B;
    padding-top: 20px;
    text-align: center;
    font-size: 13px;
  }
  .footer-bottom .sep { margin: 0 8px; color: #3A3E4A; }
  .footer a { color: #9BA0AE; }

  /* ============ 响应式 ============ */
  @media (max-width: 900px) {
    .hero { padding: 48px 0 44px; }
    .hero-grid { grid-template-columns: 1fr; gap: 36px; }
    .hero h1 { font-size: 34px; }
    .hero-sub { font-size: 15.5px; }
    .features { grid-template-columns: repeat(2, 1fr); }
    .steps { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .nav-links {
      position: absolute;
      top: 64px; left: 0; right: 0;
      flex-direction: column;
      align-items: stretch;
      background: #fff;
      border-bottom: 1px solid var(--border);
      padding: 10px 20px 18px;
      gap: 2px;
      box-shadow: 0 10px 24px rgba(30,45,90,0.10);
      display: none;
    }
    .nav-links.show { display: flex; }
    .nav-links a { padding: 12px 14px; font-size: 15px; }
    .nav-download { text-align: center; margin-top: 6px; }
    .nav-toggle { display: flex; }
    .brand-domain { display: none; }
    .section { padding: 52px 0; }
    .section-head h2 { font-size: 26px; }
  }

  @media (max-width: 640px) {
    .container { padding: 0 18px; }
    .hero h1 { font-size: 28px; }
    .hero-actions .btn { flex: 1; justify-content: center; padding: 13px 18px; font-size: 15px; }
    .features { grid-template-columns: 1fr; }
    .pay-row { grid-template-columns: 1fr; gap: 18px; padding: 24px 18px 28px; }
    .pay-card .qr-wrap img { width: 168px; height: 168px; }
    .download-card { padding: 36px 22px; }
    .download-card h2 { font-size: 24px; }
    .footer-grid { grid-template-columns: 1fr; gap: 26px; }
    .shot-body { padding: 20px 18px 24px; }
    /* 赞助码：手机端图上文字下 */
    .qr-glow img { width: 176px; height: 176px; }
    .reward-center { padding: 24px 16px 20px; }
    .reward-side { min-width: 0; width: 100%; }
    .contact-cards { grid-template-columns: 1fr; }
  }