/* VoiceCom 官网样式 — index.html / 404.html 使用 styles.css?v=…；改 CSS 后请把两处的 ?v= 数字 +1 以便浏览器拉新（当前与 HTML 中 v= 保持一致） */
    :root {
      --bg: #f6f7f9;
      --surface: #ffffff;
      --surface-2: #eef0f3;
      --text: #0c0e12;
      --muted: #5c6570;
      --faint: #8b939e;
      --border: rgba(12, 14, 18, 0.09);
      --accent: #0b5fff;
      --accent-hover: #0047d4;
      --accent-tint: rgba(11, 95, 255, 0.1);
      --shadow: 0 24px 80px rgba(12, 14, 18, 0.08), 0 2px 8px rgba(12, 14, 18, 0.04);
      --shadow-sm: 0 1px 0 rgba(255, 255, 255, 0.8) inset, 0 8px 24px rgba(12, 14, 18, 0.06);
      --radius: 14px;
      --radius-lg: 20px;
      --max: 1120px;
      --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
      --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", sans-serif;
      --page-gutter: 14px;
    }
    @media (min-width: 480px) {
      :root { --page-gutter: 18px; }
    }
    @media (min-width: 900px) {
      :root { --page-gutter: 22px; }
    }
    @media (prefers-color-scheme: dark) {
      :root {
        --bg: #0a0c10;
        --surface: #12151b;
        --surface-2: #1a1e26;
        --text: #f2f4f7;
        --muted: #9aa3af;
        --faint: #6b7280;
        --border: rgba(255, 255, 255, 0.08);
        --accent: #4d9fff;
        --accent-hover: #7ab8ff;
        --accent-tint: rgba(77, 159, 255, 0.12);
        --shadow: 0 32px 100px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(255, 255, 255, 0.04);
        --shadow-sm: 0 1px 0 rgba(255, 255, 255, 0.06) inset, 0 12px 40px rgba(0, 0, 0, 0.35);
      }
    }
    *, *::before, *::after { box-sizing: border-box; }
    html {
      scroll-behavior: smooth;
      -webkit-text-size-adjust: 100%;
      text-size-adjust: 100%;
    }
    body {
      margin: 0;
      font-family: var(--font);
      font-size: 16px;
      line-height: 1.55;
      color: var(--text);
      background: var(--bg);
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    a { color: var(--accent); }
    img { max-width: 100%; height: auto; }
    .container {
      width: 100%;
      max-width: var(--max);
      margin: 0 auto;
      padding-left: max(20px, env(safe-area-inset-left, 0px));
      padding-right: max(20px, env(safe-area-inset-right, 0px));
      padding-top: 0;
      padding-bottom: 0;
    }
    @media (min-width: 480px) {
      .container {
        padding-left: max(24px, env(safe-area-inset-left, 0px));
        padding-right: max(24px, env(safe-area-inset-right, 0px));
      }
    }
    @media (min-width: 900px) {
      .container {
        padding-left: max(32px, env(safe-area-inset-left, 0px));
        padding-right: max(32px, env(safe-area-inset-right, 0px));
      }
    }

    /* Nav */
    .nav-wrap {
      position: sticky;
      top: 0;
      z-index: 50;
      overflow: visible;
      padding-top: env(safe-area-inset-top, 0px);
      border-bottom: 1px solid var(--border);
      background: color-mix(in srgb, var(--bg) 82%, transparent);
      backdrop-filter: saturate(160%) blur(16px);
      -webkit-backdrop-filter: saturate(160%) blur(16px);
    }
    .nav {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      min-height: 64px;
      max-width: var(--max);
      margin: 0 auto;
      padding: 10px max(var(--page-gutter), env(safe-area-inset-left, 0px)) 10px max(var(--page-gutter), env(safe-area-inset-right, 0px));
    }
    /* 章节链接 + 语言切换整体靠右，避免夹在 Logo 与右侧之间 */
    .nav-end {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: clamp(16px, 2.5vw, 28px);
      flex-shrink: 0;
      min-width: 0;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
      color: var(--text);
      font-weight: 700;
      font-size: clamp(1.125rem, 2.4vw, 1.375rem);
      letter-spacing: -0.03em;
      min-width: 0;
    }
    .brand img { width: 52px; height: 52px; border-radius: 12px; flex-shrink: 0; }
    .brand-text {
      display: inline-flex;
      align-items: center;
      white-space: nowrap;
    }
    .brand-voice {
      color: var(--accent);
    }
    .brand-mark {
      color: var(--text);
    }
    @media (prefers-color-scheme: dark) {
      .brand-mark {
        color: #fff;
      }
    }
    .nav-links {
      display: flex;
      align-items: center;
      flex-wrap: nowrap;
      justify-content: flex-end;
      column-gap: clamp(16px, 2.5vw, 28px);
      font-size: 0.875rem;
      font-weight: 500;
    }
    .nav-links a {
      color: var(--muted);
      text-decoration: none;
      white-space: nowrap;
      padding: 10px 2px;
      margin: -10px -2px;
      border-radius: 8px;
      -webkit-tap-highlight-color: transparent;
    }
    .nav-links a:hover { color: var(--text); }
    .nav-links a.nav-link-active {
      color: var(--text);
      font-weight: 650;
    }

    /* 桌面：隐藏手机章节菜单按钮 */
    @media (min-width: 640px) {
      .nav-menu-wrap {
        display: none !important;
      }
    }

    .nav-menu-wrap {
      position: relative;
      flex-shrink: 0;
    }
    .nav-menu-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 44px;
      height: 44px;
      margin: 0;
      padding: 0;
      border-radius: 10px;
      border: 1px solid var(--border);
      background: var(--surface);
      color: var(--muted);
      box-shadow: var(--shadow-sm);
      cursor: pointer;
      -webkit-tap-highlight-color: transparent;
      transition: background 0.15s, border-color 0.15s, color 0.15s;
    }
    .nav-menu-btn:hover {
      color: var(--text);
      border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
    }
    .nav-menu-btn[aria-expanded="true"] {
      color: var(--accent);
      border-color: color-mix(in srgb, var(--accent) 40%, var(--border));
    }
    .nav-menu-btn:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }
    .nav-menu-icon {
      display: block;
      pointer-events: none;
    }
    .nav-mobile-dropdown {
      position: absolute;
      top: calc(100% + 8px);
      right: 0;
      z-index: 100;
      min-width: 176px;
      padding: 6px 0;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
    }
    .nav-mobile-dropdown[hidden] {
      display: none !important;
    }
    .nav-mobile-dropdown a {
      display: flex;
      align-items: center;
      min-height: 48px;
      padding: 10px 18px;
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text);
      text-decoration: none;
      white-space: nowrap;
    }
    .nav-mobile-dropdown a:hover,
    .nav-mobile-dropdown a:focus-visible {
      background: color-mix(in srgb, var(--surface-2) 85%, var(--surface));
    }
    .nav-mobile-dropdown a + a {
      border-top: 1px solid var(--border);
    }

    /* 手机：Logo + 语言 + 菜单；章节链接仅在下拉里 */
    @media (max-width: 639px) {
      .nav {
        display: flex;
        flex-wrap: nowrap;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        padding-top: 12px;
        padding-bottom: 12px;
      }
      .nav-end {
        display: flex;
        align-items: center;
        gap: 10px;
        flex-shrink: 0;
      }
      .brand {
        min-width: 0;
      }
      .nav-links {
        display: none !important;
      }
      .nav-tools {
        display: flex;
        align-items: center;
        gap: 10px;
      }
    }

    .nav-tools {
      display: flex;
      align-items: center;
      gap: 10px;
      flex-shrink: 0;
    }
    .lang-switch {
      display: inline-flex;
      align-items: stretch;
      border-radius: 10px;
      border: 1px solid var(--border);
      background: var(--surface);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .lang-btn {
      margin: 0;
      padding: 8px 12px;
      font: inherit;
      font-size: 0.8125rem;
      font-weight: 600;
      color: var(--muted);
      background: transparent;
      border: none;
      cursor: pointer;
      -webkit-tap-highlight-color: transparent;
      transition: background 0.15s, color 0.15s;
    }
    .lang-btn:hover { color: var(--text); background: color-mix(in srgb, var(--surface-2) 50%, transparent); }
    .lang-btn.active {
      color: #fff;
      background: var(--accent);
    }
    .lang-btn:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }
    @media (max-width: 639px) {
      .lang-btn { padding: 10px 12px; min-height: 44px; }
    }

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 18px;
      font-size: 0.875rem;
      font-weight: 600;
      border-radius: 10px;
      text-decoration: none;
      border: 1px solid var(--border);
      background: var(--surface);
      color: var(--text);
      box-shadow: var(--shadow-sm);
      transition: background 0.15s, border-color 0.15s, transform 0.15s;
    }
    .btn:hover { border-color: color-mix(in srgb, var(--accent) 35%, var(--border)); }
    .btn-primary {
      background: var(--accent);
      color: #fff;
      border-color: transparent;
      box-shadow: 0 1px 0 rgba(255, 255, 255, 0.15) inset, 0 4px 16px rgba(11, 95, 255, 0.35);
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      color: #fff;
    }
    .btn svg { width: 16px; height: 16px; flex-shrink: 0; }
    .btn-lg {
      padding: 14px 24px;
      font-size: 0.9375rem;
      border-radius: 12px;
    }
    /* Hero — 左右边距与 .nav 一致 */
    .hero {
      padding: clamp(40px, 7vw, 72px) 0 clamp(48px, 8vw, 88px);
    }
    .hero.container {
      padding-left: max(var(--page-gutter), env(safe-area-inset-left, 0px));
      padding-right: max(var(--page-gutter), env(safe-area-inset-right, 0px));
    }
    .hero-grid {
      display: grid;
      gap: clamp(40px, 6vw, 64px);
      align-items: center;
    }
    @media (min-width: 960px) {
      .hero-grid { grid-template-columns: 1fr 1.05fr; gap: 48px; }
    }
    .eyebrow {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--accent);
      margin-bottom: 14px;
    }
    .hero h1 {
      font-family: var(--font-display);
      font-size: clamp(2.25rem, 4.5vw, 3.25rem);
      font-weight: 700;
      letter-spacing: -0.035em;
      line-height: 1.08;
      margin: 0 0 16px;
    }
    .hero-lead {
      font-size: 1.125rem;
      color: var(--muted);
      max-width: 34em;
      margin: 0 0 28px;
    }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
    .hero-meta {
      margin-top: 20px;
      font-size: 0.8125rem;
      color: var(--faint);
    }

    /* Device frame */
    .device {
      border-radius: var(--radius-lg);
      background: var(--surface-2);
      border: 1px solid var(--border);
      box-shadow: var(--shadow);
      padding: 12px 12px 14px;
    }
    @media (max-width: 399px) {
      .device { padding: 8px 8px 10px; border-radius: var(--radius); }
    }
    .device-bar {
      display: flex;
      align-items: center;
      gap: 8px;
      padding: 0 6px 10px;
    }
    .device-dot { width: 10px; height: 10px; border-radius: 50%; }
    .device-dot:nth-child(1) { background: #ff5f57; }
    .device-dot:nth-child(2) { background: #febc2e; }
    .device-dot:nth-child(3) { background: #28c840; }
    .device-title {
      flex: 1;
      text-align: center;
      font-size: 0.6875rem;
      font-weight: 600;
      color: var(--faint);
      letter-spacing: 0.02em;
    }
    .device-shot {
      display: block;
      width: 100%;
      height: auto;
      border-radius: 10px;
      border: 1px solid var(--border);
    }

    /* Sections */
    section { padding: clamp(56px, 8vw, 96px) 0; }
    section.alt { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
    .section-head {
      max-width: 640px;
      margin-bottom: clamp(32px, 5vw, 48px);
    }
    .section-head h2 {
      font-family: var(--font-display);
      font-size: clamp(1.5rem, 2.5vw, 2rem);
      font-weight: 700;
      letter-spacing: -0.03em;
      margin: 0 0 10px;
    }
    .section-head p {
      margin: 0;
      color: var(--muted);
      font-size: 1.0625rem;
    }

    .feature-rows { display: grid; gap: clamp(40px, 6vw, 64px); }
    .feature-row {
      display: grid;
      gap: 28px;
      align-items: center;
    }
    @media (min-width: 840px) {
      .feature-row { grid-template-columns: 1fr 1fr; gap: 48px; }
      .feature-row.reverse .feature-copy { order: 2; }
      .feature-row.reverse .feature-visual { order: 1; }
    }
    .feature-copy h3 {
      font-size: 1.25rem;
      font-weight: 650;
      margin: 0 0 10px;
      letter-spacing: -0.02em;
    }
    .feature-copy p { margin: 0; color: var(--muted); font-size: 1rem; }
    .mini-shot {
      border-radius: var(--radius);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      width: 100%;
      height: auto;
      display: block;
    }

    /* iOS / iPad 截图独立区块（黑底） */
    .ios-section {
      background: #000;
      color: #eceef2;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      /* 相对普通 section，缩小标题上方与截图下方的留白 */
      padding-top: clamp(32px, 5vw, 32px);
      padding-bottom: clamp(28px, 4.5vw, 10px);
    }
    .ios-section .section-head h2 {
      color: #fff;
    }
    .ios-section .section-head p {
      color: rgba(255, 255, 255, 0.68);
    }
    .ios-showcase-visual {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      align-items: flex-start;
      gap: clamp(24px, 5vw, 48px);
      margin-top: clamp(12px, 2vw, 20px);
    }
    .ios-showcase-item {
      margin: 0;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    /* 两图统一高度，宽度按设备比例由 frame 约束 */
    .ios-showcase-frame {
      height: clamp(300px, 52vmin, 460px);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .ios-showcase-item--iphone .ios-showcase-frame {
      width: clamp(200px, 34vw, 290px);
    }
    @media (min-width: 640px) {
      .ios-showcase-item--iphone {
        margin-top: clamp(20px, 4vw, 44px);
      }
    }
    .ios-showcase-item--ipad {
      margin-top: clamp(-23px, -1.8vw, -24px);
    }
    .ios-showcase-item--ipad .ios-showcase-frame {
      width: clamp(360px, 68vw, 640px);
      height: clamp(380px, 62vmin, 600px);
    }
    .ios-showcase-shot {
      border-radius: clamp(28px, 8vmin, 44px);
      border: none;
      width: 100%;
      height: 100%;
      max-width: 100%;
      max-height: 100%;
      object-fit: contain;
      display: block;
      /* 边缘羽化：融入黑底 */
      -webkit-mask-image: radial-gradient(
        ellipse 96% 98% at 50% 50%,
        #000 0%,
        #000 78%,
        rgba(0, 0, 0, 0.55) 88%,
        rgba(0, 0, 0, 0.12) 96%,
        transparent 100%
      );
      mask-image: radial-gradient(
        ellipse 96% 98% at 50% 50%,
        #000 0%,
        #000 78%,
        rgba(0, 0, 0, 0.55) 88%,
        rgba(0, 0, 0, 0.12) 96%,
        transparent 100%
      );
      -webkit-mask-repeat: no-repeat;
      mask-repeat: no-repeat;
      -webkit-mask-size: 100% 100%;
      mask-size: 100% 100%;
      box-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.14),
        0 16px 48px rgba(0, 0, 0, 0.55),
        0 0 80px -16px rgba(77, 159, 255, 0.22);
    }
    .ios-showcase-shot--ipad {
      border-radius: clamp(20px, 3vmin, 32px);
    }
    @media (max-width: 639px) {
      .ios-showcase-visual {
        flex-direction: column;
        align-items: center;
      }
      .ios-showcase-item--iphone .ios-showcase-frame {
        width: min(100%, 320px);
      }
      .ios-showcase-item--ipad .ios-showcase-frame {
        width: min(100%, 520px);
        height: clamp(360px, 60vmin, 520px);
      }
    }

    .feature-more {
      margin-top: clamp(48px, 7vw, 72px);
      padding-top: clamp(40px, 6vw, 56px);
      border-top: 1px solid var(--border);
    }
    .feature-more-title {
      font-family: var(--font-display);
      font-size: clamp(1.125rem, 2vw, 1.35rem);
      font-weight: 650;
      letter-spacing: -0.02em;
      margin: 0 0 clamp(18px, 3vw, 24px);
      color: var(--text);
    }
    .feature-text-grid {
      display: grid;
      gap: 14px;
    }
    @media (min-width: 560px) {
      .feature-text-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
    }
    .feature-text {
      margin: 0;
      padding: 20px 22px;
      background: color-mix(in srgb, var(--surface) 70%, var(--surface-2));
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow-sm);
    }
    .feature-text h4 {
      margin: 0 0 8px;
      font-size: 1.0625rem;
      font-weight: 650;
      letter-spacing: -0.02em;
      color: var(--text);
    }
    .feature-text p {
      margin: 0;
      font-size: 0.9375rem;
      color: var(--muted);
      line-height: 1.55;
    }

    /* Contact strip */
    .contact-strip {
      text-align: center;
      padding: 40px 0 max(56px, env(safe-area-inset-bottom, 0px) + 40px);
      color: var(--muted);
      font-size: 0.9375rem;
    }
    .contact-strip strong { color: var(--text); }
    .contact-line {
      margin: 0;
      line-height: 1.6;
    }
    .contact-email {
      margin: 14px 0 0;
      line-height: 1.6;
      color: var(--muted);
    }
    .contact-email-link {
      color: var(--accent);
      font-weight: 500;
      text-decoration: none;
    }
    .contact-email-link:hover {
      text-decoration: underline;
    }
    .contact-wechat {
      position: relative;
      display: inline-block;
      vertical-align: baseline;
    }
    .contact-wechat-trigger {
      cursor: default;
      text-decoration: underline;
      text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
      text-underline-offset: 3px;
    }
    .contact-wechat:hover .contact-wechat-trigger,
    .contact-wechat:focus-within .contact-wechat-trigger {
      color: var(--accent);
    }
    .contact-wechat-pop {
      position: absolute;
      left: 50%;
      bottom: 100%;
      z-index: 60;
      margin-bottom: 10px;
      padding: 14px;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      box-shadow: var(--shadow);
      opacity: 0;
      visibility: hidden;
      transform: translateX(-50%) translateY(6px);
      transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
      pointer-events: none;
    }
    .contact-wechat:hover .contact-wechat-pop,
    .contact-wechat:focus-within .contact-wechat-pop {
      opacity: 1;
      visibility: visible;
      transform: translateX(-50%) translateY(0);
      pointer-events: auto;
    }
    .contact-wechat-pop img {
      display: block;
      width: clamp(300px, 48vmin, 480px);
      max-width: min(480px, 94vw);
      height: auto;
      border-radius: 10px;
    }
    /* 避免气泡超出视口：靠右时略左移 */
    @media (max-width: 400px) {
      .contact-wechat-pop {
        left: auto;
        right: 0;
        transform: translateY(6px);
      }
      .contact-wechat:hover .contact-wechat-pop,
      .contact-wechat:focus-within .contact-wechat-pop {
        transform: translateY(0);
      }
    }

    /* Footer */
    footer {
      border-top: 1px solid var(--border);
      padding: 28px 0 max(40px, env(safe-area-inset-bottom, 0px) + 24px);
      text-align: center;
      font-size: 0.8125rem;
      color: var(--faint);
    }
    footer p { margin: 4px 0; }
    .footer-icp {
      margin-top: 10px;
    }
    .footer-icp a {
      color: inherit;
      text-decoration: none;
    }
    .footer-icp a:hover {
      color: var(--muted);
      text-decoration: underline;
    }

    @media (pointer: coarse) {
      .btn { min-height: 44px; }
      .btn-lg { min-height: 48px; }
    }
    @media (max-width: 479px) {
      .hero-actions { flex-direction: column; align-items: stretch; }
      .hero-actions .btn { width: 100%; justify-content: center; }
      .hero h1 br { display: none; }
    }
    @media (min-width: 480px) and (max-width: 959px) {
      .hero-grid { gap: 36px; }
    }
    /* iPad 横屏等较宽平板：略提前双栏，充分利用宽度 */
    @media (min-width: 900px) and (max-width: 959px) {
      .hero-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
    }

    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      .btn { transition: none; }
      .contact-wechat-pop { transition: none; }
    }

    /* 404 页面 */
    .page-404 {
      min-height: 100dvh;
      display: flex;
      flex-direction: column;
    }
    .page-404-main {
      flex: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: clamp(40px, 10vw, 80px) max(var(--page-gutter), env(safe-area-inset-left, 0px)) clamp(48px, 8vw, 72px) max(var(--page-gutter), env(safe-area-inset-right, 0px));
    }
    .error-404-inner {
      text-align: center;
      max-width: 520px;
      margin: 0 auto;
    }
    .error-404-code {
      font-family: var(--font-display);
      font-size: clamp(3.5rem, 12vw, 6.5rem);
      font-weight: 800;
      letter-spacing: -0.06em;
      line-height: 0.95;
      margin: 0 0 8px;
      color: var(--text);
      opacity: 0.14;
      user-select: none;
    }
    .error-404-title {
      font-family: var(--font-display);
      font-size: clamp(1.35rem, 3.2vw, 1.75rem);
      font-weight: 700;
      letter-spacing: -0.03em;
      margin: 0 0 12px;
      color: var(--text);
    }
    .error-404-desc {
      margin: 0 0 20px;
      color: var(--muted);
      font-size: 1.0625rem;
      line-height: 1.55;
    }
    .error-404-path {
      margin: 0 0 28px;
      font-size: 0.8125rem;
      color: var(--faint);
      word-break: break-all;
    }
    .error-404-path-code {
      font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
      font-size: 0.8125rem;
      color: var(--muted);
      background: var(--surface-2);
      padding: 2px 6px;
      border-radius: 6px;
      border: 1px solid var(--border);
    }
    .error-404-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
    }

    .nav-mobile-dropdown a.nav-link-active {
      color: var(--accent);
      font-weight: 650;
    }

    /* 支持页：用户案例表单 */
    .support-main {
      padding-bottom: clamp(48px, 8vw, 80px);
    }
    .support-hero {
      padding: clamp(40px, 6vw, 56px) 0 clamp(24px, 4vw, 36px);
    }
    .support-form-section {
      padding-bottom: clamp(32px, 6vw, 48px);
    }
    .support-card {
      max-width: 640px;
      margin: 0 auto;
      padding: clamp(22px, 4vw, 32px);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border);
      background: var(--surface);
      box-shadow: var(--shadow-sm);
    }
    .support-card .form-field {
      margin-bottom: 20px;
    }
    .support-card .form-field:last-of-type {
      margin-bottom: 16px;
    }
    .support-card label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text);
      margin-bottom: 8px;
    }
    .support-card .field-hint {
      margin: 6px 0 0;
      font-size: 0.8125rem;
      color: var(--faint);
      line-height: 1.45;
    }
    .support-card input[type="text"],
    .support-card textarea {
      width: 100%;
      margin: 0;
      padding: 12px 14px;
      font: inherit;
      font-size: 1rem;
      color: var(--text);
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: 10px;
      box-sizing: border-box;
    }
    .support-card textarea {
      min-height: 160px;
      resize: vertical;
      line-height: 1.5;
    }
    .support-card input:focus-visible,
    .support-card textarea:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }
    .support-card .form-note {
      margin: 0 0 20px;
      font-size: 0.8125rem;
      color: var(--muted);
      line-height: 1.5;
    }
    .support-msg {
      max-width: 640px;
      margin: 16px auto 0;
      padding: 12px 16px;
      border-radius: var(--radius);
      font-size: 0.9375rem;
      text-align: center;
    }
    .support-msg.is-error {
      background: color-mix(in srgb, #dc2626 12%, var(--surface));
      color: #b91c1c;
      border: 1px solid color-mix(in srgb, #dc2626 25%, var(--border));
    }
    .support-msg.is-ok {
      background: color-mix(in srgb, var(--accent) 12%, var(--surface));
      color: var(--text);
      border: 1px solid color-mix(in srgb, var(--accent) 28%, var(--border));
    }