:root {
      --font: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --max-width: 1200px;
      --nav-height: 68px;
      --radius-sm: 8px;
      --radius: 14px;
      --radius-lg: 22px;
      --radius-xl: 30px;
      --radius-full: 999px;
      --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    [data-theme="light"] {
      --bg: #F8F8FA;
      --bg-alt: #EDEFF3;
      --bg-card: #FFFFFF;
      --bg-nav: rgba(255,255,255,0.82);
      --border: #E5E7EB;
      --text: #1A202C;
      --text-secondary: #4A5568;
      --text-muted: #718096;
      --accent: #F97316;
      --accent-rgb: 249,115,22;
      --accent-hover: #EA580C;
      --accent-soft: rgba(249,115,22,0.12);
      --accent-glow: rgba(249,115,22,0.25);
      --badge-bg: #FEF3C7;
      --badge-text: #B45309;
      --success: #22C55E;
      --card-shadow: 0 1px 4px rgba(0,0,0,0.03), 0 4px 12px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 4px 20px rgba(0,0,0,0.1), 0 12px 40px rgba(0,0,0,0.06);
      --hero-gradient: linear-gradient(165deg, #F8F9FA 0%, #EDEFF3 50%, #F8F9FA 100%);
      --partner-bg: #FFF7ED;
      --ai-bg: #1E293B;
      --ad-bg: rgba(255,255,255,0.95);
    }
    [data-theme="dark"] {
      --bg: #0A0D12;
      --bg-alt: #12161E;
      --bg-card: #161B24;
      --bg-nav: rgba(10,13,18,0.85);
      --border: #2A3040;
      --text: #EBEEF3;
      --text-secondary: #B0B9C6;
      --text-muted: #7A8494;
      --accent: #F97316;
      --accent-rgb: 249,115,22;
      --accent-hover: #FB923C;
      --accent-soft: rgba(249,115,22,0.15);
      --accent-glow: rgba(249,115,22,0.35);
      --badge-bg: rgba(251,191,36,0.18);
      --badge-text: #FBBF24;
      --success: #22C55E;
      --card-shadow: 0 2px 8px rgba(0,0,0,0.25);
      --card-shadow-hover: 0 4px 24px rgba(0,0,0,0.45);
      --hero-gradient: linear-gradient(165deg, #0A0D12 0%, #12161E 50%, #0A0D12 100%);
      --partner-bg: #1F242D;
      --ai-bg: #0B0E14;
      --ad-bg: rgba(22,27,36,0.95);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; font-size: 16px; }
    body { font-family: var(--font); background: var(--bg); color: var(--text); line-height: 1.6; overflow-x: hidden; transition: background var(--transition), color var(--transition); padding-bottom: 175px; }
    body.ad-hidden { padding-bottom: 0; }
    a { text-decoration: none; color: inherit; transition: color var(--transition); }
    ul { list-style: none; }
    .nav { position: fixed; top: 0; left: 0; width: 100%; z-index: 1000; background: var(--bg-nav); backdrop-filter: blur(20px); border-bottom: 1px solid transparent; height: var(--nav-height); display: flex; align-items: center; transition: all var(--transition); }
    .nav.scrolled { border-bottom-color: var(--border); box-shadow: 0 4px 24px rgba(0,0,0,0.08); }
    .nav-inner { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 28px; display: flex; align-items: center; justify-content: space-between; height: 100%; }
    .nav-logo { display: flex; align-items: center; gap: 3px; font-weight: 800; font-size: 1.25rem; color: var(--text); letter-spacing: -0.01em; flex-shrink: 0; transition: transform var(--transition); }
    .nav-logo:hover { transform: scale(1.02); }
    .logo-svg { width: 76px; height: 76px; color: var(--accent); animation: catWiggle 3s ease-in-out infinite; }
    .logo-svg .cat-eye { animation: catBlink 3s ease-in-out infinite; transform-origin: top center; }
    .logo-cat { font-size: 1.8rem; line-height: 1; display: inline-block; animation: catWiggle 3s ease-in-out infinite; }
    @keyframes catWiggle { 0%,100% { transform: rotate(0deg); } 25% { transform: rotate(-5deg); } 75% { transform: rotate(5deg); } }
    @keyframes catBlink { 0%,90%,100% { transform: scaleY(1); } 93%,97% { transform: scaleY(0.05); } }
    .logo-dot { color: var(--accent); }
    .nav-right { display: flex; align-items: center; gap: 16px; margin-left: auto; }
    .nav-links { display: flex; align-items: center; gap: 6px; justify-content: flex-end; }
    .nav-links a { padding: 8px 18px; border-radius: var(--radius-full); font-size: 0.9rem; font-weight: 600; color: var(--text-muted); transition: all var(--transition); white-space: nowrap; min-width: calc(5ch + 36px); text-align: center; }
    .nav-links a:hover { color: #fff; background: linear-gradient(135deg, var(--accent) 0%, #ff6b6b 100%); transform: translateY(-1px); box-shadow: 0 4px 15px rgba(var(--accent-rgb), 0.4); }
    .nav-links a.active { color: #fff; background: linear-gradient(135deg, var(--accent) 0%, #ff6b6b 100%); box-shadow: 0 4px 15px rgba(var(--accent-rgb), 0.4); }
    .nav-dropdown { position: relative; display: inline-block; }
    .nav-dropdown-toggle { display: flex; align-items: center; gap: 4px; cursor: pointer; }
    .nav-dropdown-toggle::after { content: '▼'; font-size: 0.6rem; margin-left: 2px; }
    .nav-dropdown-menu { display: none; position: absolute; top: 100%; left: 50%; transform: translateX(-50%); background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--card-shadow-hover); min-width: 160px; z-index: 1000; padding: 8px 0; margin-top: 0; }
    .nav-dropdown::after { content: ''; position: absolute; top: 100%; left: 0; right: 0; height: 10px; }
    .nav-dropdown:hover .nav-dropdown-menu,
    .nav-dropdown.open .nav-dropdown-menu { display: block; }
    .nav-dropdown-menu a { display: block; padding: 10px 20px; color: var(--text); font-size: 0.95rem; transition: all 0.2s ease; border-radius: 0; white-space: nowrap; }
    .nav-dropdown-menu a:hover { background: var(--accent-soft); color: var(--accent); transform: translateY(0); }
    .theme-toggle { background: var(--bg-card); border: 1px solid var(--border); border-radius: 50%; width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all var(--transition); flex-shrink: 0; color: var(--text); }
    .theme-toggle:hover { border-color: var(--accent); transform: rotate(15deg) scale(1.1); box-shadow: 0 0 20px var(--accent-glow); }
    .theme-toggle svg { width: 20px; height: 20px; stroke: currentColor; fill: none; stroke-width: 2; }
    [data-theme="dark"] .icon-light { display: none; }
    [data-theme="light"] .icon-dark { display: none; }
    .nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 8px; z-index: 1001; position: relative; }
    .nav-toggle span { width: 26px; height: 2.5px; background: var(--text); border-radius: 10px; display: block; transition: all var(--transition); transform-origin: center; }
    .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
    .nav-toggle.active span:nth-child(2) { opacity: 0; transform: translateX(20px); }
    .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }
    .mobile-menu { position: fixed; top: var(--nav-height); left: 0; width: 100%; background: var(--bg-card); backdrop-filter: blur(20px); padding: 20px 28px 32px; display: none; flex-direction: column; gap: 0; z-index: 9999; border-bottom: 1px solid var(--border); box-shadow: 0 20px 40px rgba(0,0,0,0.1); animation: slideDown 0.3s ease; overflow-y: auto; max-height: calc(100vh - var(--nav-height)); }
    .mobile-menu.active { display: flex; }
    @keyframes slideDown { from { opacity: 0; transform: translateY(-12px); } to { opacity: 1; transform: translateY(0); } }
    .mobile-menu-item { display: flex; flex-direction: column; }
    .mobile-menu-link { padding: 14px 18px; border-radius: var(--radius-sm); font-size: 1rem; font-weight: 600; color: var(--text); transition: all var(--transition); display: flex; justify-content: space-between; align-items: center; width: 100%; cursor: pointer; }
    .mobile-menu-link:hover { background: var(--accent-soft); color: var(--accent); }
    .mobile-menu-link:active { background: var(--accent-soft); }
    .mobile-menu-link .arrow { transition: transform 0.3s ease; font-size: 0.8rem; }
    .mobile-menu-link.active .arrow { transform: rotate(180deg); }
    .mobile-dropdown-menu { display: none; padding-left: 20px; padding-bottom: 8px; }
    .mobile-dropdown-menu.active { display: block; }
    .mobile-dropdown-menu a { padding: 10px 18px; border-radius: var(--radius-sm); font-size: 0.95rem; font-weight: 500; color: var(--text-secondary); transition: all var(--transition); display: block; width: 100%; }
    .mobile-dropdown-menu a:hover { background: var(--accent-soft); color: var(--accent); transform: translateX(4px); }
    /* 移动端防止点击穿透 */
    .mobile-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.2); z-index: 9998; display: none; }
    .mobile-overlay.active { display: block; }
    .hero { padding: calc(var(--nav-height) + 60px) 28px 80px; background: var(--hero-gradient); position: relative; overflow: hidden; }
    .hero::before, .hero::after { content: ''; position: absolute; width: 700px; height: 700px; background: radial-gradient(circle, var(--accent-soft) 0%, transparent 70%); border-radius: 50%; pointer-events: none; }
    .hero::before { top: -50%; right: -20%; animation: float 6s ease-in-out infinite; }
    .hero::after { bottom: -30%; left: -10%; animation: float 8s ease-in-out infinite reverse; }
    @keyframes float { 0%,100% { transform: translateY(0) scale(1); } 50% { transform: translateY(-20px) scale(1.05); } }
    .hero-inner { max-width: var(--max-width); margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; position: relative; z-index: 1; }
    .hero-text { display: flex; flex-direction: column; gap: 20px; }
    .hero-badge { display: inline-flex; align-items: center; gap: 8px; background: var(--badge-bg); border: 1px solid var(--border); border-radius: var(--radius-full); padding: 8px 16px; font-size: 0.85rem; font-weight: 600; color: var(--badge-text); width: fit-content; }
    .badge-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--success); animation: pulse 2s infinite; }
    @keyframes pulse { 0%,100% { box-shadow: 0 0 0 0 rgba(34,197,94,0.5); } 50% { box-shadow: 0 0 0 10px rgba(34,197,94,0); } }
    .hero h1 { font-size: clamp(2.3rem, 5vw, 3.4rem); font-weight: 800; letter-spacing: -0.03em; line-height: 1.1; color: var(--text); }
    .hero h1 .highlight { color: var(--accent); position: relative; display: inline-block; }
    .hero h1 .highlight::after { content: ''; position: absolute; bottom: 0; left: 0; width: 100%; height: 8px; background: var(--accent-soft); border-radius: 4px; z-index: -1; }
    .hero-desc { font-size: 1.1rem; color: var(--text-secondary); line-height: 1.8; max-width: 500px; }
    .hero-btns { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 8px; }
    .btn { display: inline-flex; align-items: center; gap: 8px; padding: 14px 26px; font-size: 1rem; font-weight: 700; border-radius: var(--radius-full); cursor: pointer; transition: all var(--transition); border: none; white-space: nowrap; font-family: inherit; letter-spacing: 0.01em; position: relative; overflow: hidden; }
    .btn::before { content: ''; position: absolute; top: 50%; left: 50%; width: 0; height: 0; background: rgba(255,255,255,0.2); border-radius: 50%; transform: translate(-50%, -50%); transition: width 0.6s ease, height 0.6s ease; }
    .btn:active::before { width: 300px; height: 300px; }
    .btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 22px var(--accent-glow); }
    .btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 12px 40px var(--accent-glow); }
    .btn-primary:active { transform: translateY(0); }
    .btn-outline { background: transparent; color: var(--text); border: 2px solid var(--accent); opacity: 0.85; }
    .btn-outline:hover { opacity: 1; color: var(--accent); background: var(--accent-soft); transform: translateY(-2px); }
    .hero-visual { display: flex; justify-content: center; align-items: center; }
    .hero-illustration { position: relative; width: 100%; max-width: 460px; animation: heroFloat 4s ease-in-out infinite; }
    .hero-illustration svg { animation: catBounce 2s ease-in-out infinite; }
    .hero-illustration svg .cat-eye { animation: catBlink 3s ease-in-out infinite; transform-origin: top center; }
    @keyframes catBounce { 0%,100% { transform: scale(1); } 50% { transform: scale(1.05); } }
    @keyframes heroFloat { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
    @keyframes mockPulse { 0%,100% { opacity: 1; } 50% { opacity: 0.6; } }
    @keyframes typing { 0%, 60%, 100% { width: 0; } 30% { width: 100%; } }
    .counter { transition: all 0.1s ease; }
    .hero-illustration svg { width: 100%; height: auto; filter: drop-shadow(0 10px 20px rgba(249,115,22,0.2)); }
    .hero-speech { position: absolute; top: 5px; right: -20px; background: var(--accent); color: #fff; padding: 10px 20px; border-radius: var(--radius-full); font-weight: 700; font-size: 0.95rem; box-shadow: 0 0 20px var(--accent-glow); animation: breathGlow 2s ease-in-out infinite; }
    @keyframes breathGlow { 0%,100% { box-shadow: 0 0 10px var(--accent-glow); } 50% { box-shadow: 0 0 30px var(--accent), 0 0 60px var(--accent-glow); } }
    .section { padding: 80px 28px; }
    .section-inner { max-width: var(--max-width); margin: 0 auto; }
    .section-header { text-align: center; margin-bottom: 52px; }
    .section-label { display: inline-block; font-size: 0.82rem; font-weight: 700; color: var(--accent); background: var(--accent-soft); padding: 6px 16px; border-radius: var(--radius-full); margin-bottom: 14px; letter-spacing: 0.02em; }
    .section-title { font-size: clamp(1.8rem, 3.5vw, 2.5rem); font-weight: 800; color: var(--text); letter-spacing: -0.02em; margin-bottom: 10px; }
    .section-subtitle { font-size: 1.05rem; color: var(--text-muted); max-width: 560px; margin: 0 auto; }
    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 30px 24px; border: 1px solid var(--border); box-shadow: var(--card-shadow); transition: all var(--transition); display: flex; flex-direction: column; align-items: center; text-align: center; position: relative; overflow: hidden; cursor: pointer; }
    .card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: linear-gradient(90deg, var(--accent), var(--accent-hover)); transform: scaleX(0); transition: transform var(--transition); }
    .card::after { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--accent-soft) 0%, transparent 50%); opacity: 0; transition: opacity var(--transition); pointer-events: none; }
    .card:hover::before { transform: scaleX(1); }
    .card:hover::after { opacity: 1; }
    .card:hover { transform: translateY(-6px); box-shadow: var(--card-shadow-hover); border-color: var(--accent); }
    .card:active { transform: translateY(-2px); }
    .card-icon { width: 56px; height: 56px; margin-bottom: 18px; color: var(--accent); transition: transform var(--transition); }
    .card:hover .card-icon { transform: scale(1.1) rotate(5deg); }
    .card h3 { font-size: 1.1rem; font-weight: 700; color: var(--text); margin-bottom: 8px; }
    .card p { font-size: 0.9rem; color: var(--text-muted); }
    .services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .service-card { background: var(--bg-card); border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); box-shadow: var(--card-shadow); transition: all var(--transition); display: flex; flex-direction: column; height: 100%; position: relative; overflow: hidden; cursor: pointer; }
    .service-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--accent); transform: scaleX(0); transition: transform var(--transition); }
    .service-card::after { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--accent-soft) 0%, transparent 50%); opacity: 0; transition: opacity var(--transition); pointer-events: none; }
    .service-card:hover::before { transform: scaleX(1); }
    .service-card:hover::after { opacity: 1; }
    .service-card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: var(--card-shadow-hover); }
    .service-card:active { transform: translateY(-2px); }
    .svc-header { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
    .svc-icon { width: 42px; height: 42px; color: var(--accent); flex-shrink: 0; transition: transform var(--transition); }
    .service-card:hover .svc-icon { transform: scale(1.1); }
    .svc-title { font-size: 1.05rem; font-weight: 700; color: var(--text); }
    .service-card .desc { font-size: 0.9rem; color: var(--text-muted); flex-grow: 1; margin-bottom: 16px; line-height: 1.7; }
    .btn-service { display: block; margin-left: auto; padding: 9px 18px; font-size: 0.85rem; font-weight: 700; border-radius: var(--radius-full); background: var(--accent); color: #fff; border: none; cursor: pointer; transition: all var(--transition); text-align: center; }
    .btn-service:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 4px 15px var(--accent-glow); }
    .download-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .download-card { background: var(--bg-card); border-radius: var(--radius); padding: 16px 20px; border: 1px solid var(--border); box-shadow: var(--card-shadow); transition: all var(--transition); display: flex; align-items: center; justify-content: space-between; position: relative; overflow: hidden; cursor: pointer; }
    .download-card::before { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--accent-soft) 0%, transparent 50%); opacity: 0; transition: opacity var(--transition); pointer-events: none; }
    .download-card::after { content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: linear-gradient(135deg, transparent 50%, var(--accent-soft) 100%); opacity: 0; transition: opacity var(--transition); }
    .download-card:hover::before { opacity: 1; }
    .download-card:hover::after { opacity: 1; }
    .download-card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--card-shadow-hover); }
    .download-card:active { transform: translateY(-1px); }
    .download-info { display: flex; align-items: center; gap: 12px; position: relative; z-index: 1; }
    .dl-icon { width: 32px; height: 32px; color: var(--accent); transition: transform var(--transition); }
    .download-card:hover .dl-icon { transform: scale(1.15); }
    .dl-name { font-weight: 700; font-size: 0.9rem; color: var(--text); }
    .dl-desc { font-size: 0.78rem; color: var(--text-muted); }
    .btn-dl { padding: 8px 18px; font-size: 0.85rem; font-weight: 700; border-radius: var(--radius-full); border: 2px solid var(--accent); color: var(--accent); background: transparent; cursor: pointer; transition: all var(--transition); white-space: nowrap; position: relative; z-index: 1; }
    .btn-dl:hover { background: var(--accent); color: #fff; transform: scale(1.05); }
    .tutorial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .tutorial-card { background: var(--bg-card); border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--border); box-shadow: var(--card-shadow); transition: all var(--transition); display: flex; flex-direction: column; position: relative; cursor: pointer; }
    .tutorial-card::before { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--accent-soft) 0%, transparent 50%); opacity: 0; transition: opacity var(--transition); pointer-events: none; z-index: 0; }
    .tutorial-card:hover::before { opacity: 1; }
    .tutorial-card:hover { transform: translateY(-6px); box-shadow: var(--card-shadow-hover); border-color: var(--accent); }
    .tutorial-card:active { transform: translateY(-3px); }
    .tutorial-img { height: 140px; display: flex; align-items: center; justify-content: center; background: var(--bg-alt); border-bottom: 1px solid var(--border); font-size: 3.5rem; transition: all var(--transition); }
    .tutorial-card:hover .tutorial-img { background: var(--accent-soft); }
    .tutorial-img span { display: inline-block; transition: transform var(--transition); }
    .tutorial-card:hover .tutorial-img span { transform: scale(1.15) rotate(5deg); }
    .tutorial-body { padding: 18px; flex-grow: 1; display: flex; flex-direction: column; align-items: center; text-align: center; }
    .tutorial-body h4 { font-weight: 700; color: var(--text); margin-bottom: 8px; }
    .tutorial-body p { font-size: 0.9rem; color: var(--text-muted); }
    .btn-read { margin-top: 14px; padding: 8px 20px; font-size: 0.85rem; font-weight: 700; border-radius: var(--radius-full); background: transparent; color: var(--accent); border: 2px solid var(--accent); cursor: pointer; transition: all var(--transition); }
    .btn-read:hover { background: var(--accent); color: #fff; transform: translateY(-2px); }
    .ai-section { background: var(--ai-bg); position: relative; overflow: hidden; color: #F1F5F9; }
    .ai-section::before { content: ''; position: absolute; top: -50%; right: -30%; width: 800px; height: 800px; background: radial-gradient(circle, rgba(249,115,22,0.1) 0%, transparent 70%); border-radius: 50%; animation: float 10s ease-in-out infinite; }
    .ai-inner { max-width: var(--max-width); margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; position: relative; z-index: 1; }
    .ai-text h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 800; color: #F1F5F9; margin-bottom: 14px; }
    .ai-highlight { color: #FBBF24; }
    .ai-text p { color: #CBD5E1; margin-bottom: 8px; line-height: 1.8; }
    .ai-list { margin-top: 14px; display: flex; flex-direction: column; gap: 8px; }
    .ai-list li { display: flex; align-items: center; gap: 10px; color: #E2E8F0; transition: transform var(--transition); }
    .ai-list li:hover { transform: translateX(4px); }
    .check { width: 20px; height: 20px; border-radius: 50%; background: var(--success); display: flex; align-items: center; justify-content: center; font-size: 0.7rem; flex-shrink: 0; }
    .ai-mockup { background: #0F172A; border-radius: var(--radius-lg); padding: 20px; border: 1px solid #334155; max-width: 320px; width: 100%; animation: mockupFloat 3s ease-in-out infinite; }
    @keyframes mockupFloat { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
    .mockup-header { display: flex; gap: 6px; margin-bottom: 14px; }
    .mockup-header span { width: 10px; height: 10px; border-radius: 50%; }
    .partner-section { background: var(--partner-bg); border-top: 3px solid var(--accent); border-bottom: 3px solid var(--accent); padding: 80px 28px; position: relative; overflow: hidden; }
    .partner-section::before, .partner-section::after { content: ''; position: absolute; background: radial-gradient(circle, var(--accent-soft) 0%, transparent 70%); border-radius: 50%; pointer-events: none; }
    .partner-section::before { top: -60px; right: -60px; width: 200px; height: 200px; animation: float 8s ease-in-out infinite; }
    .partner-section::after { bottom: -40px; left: -40px; width: 160px; height: 160px; animation: float 10s ease-in-out infinite reverse; }
    .partner-stats-row { display: flex; gap: 32px; justify-content: center; flex-wrap: wrap; margin: 36px 0; position: relative; z-index: 1; }
    .partner-stat { background: var(--bg-card); border-radius: var(--radius-lg); padding: 32px 36px; text-align: left; min-width: 280px; flex: 1; max-width: 340px; border: 2px solid var(--border); box-shadow: var(--card-shadow); transition: all var(--transition); display: flex; flex-direction: row; align-items: center; gap: 24px; cursor: pointer; position: relative; overflow: hidden; }
    .partner-stat::before { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--accent-soft) 0%, transparent 50%); opacity: 0; transition: opacity var(--transition); pointer-events: none; }
    .partner-stat:hover::before { opacity: 1; }
    .partner-stat:hover { border-color: var(--accent); transform: translateY(-6px); box-shadow: var(--card-shadow-hover); }
    .partner-stat:active { transform: translateY(-3px); }
    .partner-stat .stat-icon { width: 64px; height: 64px; border-radius: 50%; background: var(--accent-soft); display: flex; align-items: center; justify-content: center; color: var(--accent); flex-shrink: 0; transition: transform var(--transition); }
    .partner-stat:hover .stat-icon { transform: scale(1.1) rotate(10deg); }
    .partner-stat .stat-icon svg { width: 32px; height: 32px; }
    .partner-stat .stat-info { display: flex; flex-direction: column; flex: 0 0 auto; min-width: 0; }
    .partner-stat .big-num { font-size: 2.4rem; font-weight: 800; color: var(--accent); letter-spacing: -0.02em; line-height: 1; white-space: nowrap; }
    .partner-stat .big-lbl { font-size: 1rem; font-weight: 700; color: var(--text); letter-spacing: 0.02em; margin-top: 4px; }
    .partner-stat .stat-sub { font-size: 0.82rem; color: var(--text-muted); margin-top: 2px; }
    .member-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
    .member-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 30px 24px; border: 1px solid var(--border); box-shadow: var(--card-shadow); transition: all var(--transition); text-align: center; display: flex; flex-direction: column; align-items: center; position: relative; overflow: hidden; cursor: pointer; }
    .member-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; background: linear-gradient(90deg, var(--accent), var(--accent-hover)); }
    .member-card::after { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--accent-soft) 0%, transparent 50%); opacity: 0; transition: opacity var(--transition); pointer-events: none; }
    .member-card:hover::after { opacity: 1; }
    .member-card:hover { transform: translateY(-6px); box-shadow: var(--card-shadow-hover); border-color: var(--accent); }
    .member-card:active { transform: translateY(-3px); }
    .member-type { font-size: 1.2rem; font-weight: 700; color: var(--accent); margin-bottom: 16px; }
    .member-price { font-size: 2.2rem; font-weight: 800; color: var(--text); margin-bottom: 4px; }
    .member-duration { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 16px; }
    .member-features { list-style: none; margin-bottom: 20px; flex-grow: 1; }
    .member-features li { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 8px; padding: 4px 0; }
    .btn-member { padding: 10px 24px; font-size: 0.9rem; font-weight: 700; border-radius: var(--radius-full); background: var(--accent); color: #fff; border: none; cursor: pointer; transition: all var(--transition); }
    .btn-member:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 4px 15px var(--accent-glow); }
    .footer { background: var(--bg-card); border-top: 1px solid var(--border); padding: 48px 28px 24px; }
    .footer-inner { max-width: var(--max-width); margin: 0 auto; display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 36px; }
    .footer-col h4 { color: var(--text); margin-bottom: 14px; font-size: 0.9rem; font-weight: 700; }
    .footer-col a { display: block; color: var(--text-muted); font-size: 0.85rem; margin-bottom: 8px; transition: all var(--transition); }
    .footer-col a:hover { color: var(--accent); transform: translateX(4px); }
    .footer-bottom { max-width: var(--max-width); margin: 32px auto 0; padding-top: 20px; border-top: 1px solid var(--border); text-align: center; font-size: 0.8rem; color: var(--text-muted); }
    .disclaimer { background: var(--bg-alt); border-top: 1px solid var(--border); padding: 22px 28px; text-align: center; font-size: 0.82rem; color: var(--text-muted); line-height: 1.8; }
    .bottom-ad-bar { position: fixed; bottom: 0; left: 0; width: 100%; z-index: 998; background: var(--ad-bg); backdrop-filter: blur(20px); border-top: 2px solid var(--accent); padding: 18px 20px 14px; transition: all var(--transition); box-shadow: 0 -8px 30px rgba(0,0,0,0.15); }
    .bottom-ad-bar.hidden { transform: translateY(100%); opacity: 0; pointer-events: none; }
    .ad-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
    .ad-card { background: var(--bg-card); border-radius: var(--radius); padding: 20px 12px; text-align: center; border: 1px solid var(--border); transition: all var(--transition); cursor: pointer; position: relative; overflow: hidden; }
    .ad-card::before { content: ''; position: absolute; inset: 0; background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--accent-soft) 0%, transparent 50%); opacity: 0; transition: opacity var(--transition); pointer-events: none; }
    .ad-card:hover::before { opacity: 1; }
    .ad-card:hover { border-color: var(--accent); transform: translateY(-4px); box-shadow: var(--card-shadow-hover); }
    .ad-card:active { transform: translateY(-2px); }
    .ad-card svg { width: 28px; height: 28px; color: var(--accent); margin-bottom: 6px; transition: transform var(--transition); position: relative; z-index: 1; }
    .ad-card:hover svg { transform: scale(1.15); }
    .ad-card .ad-title { font-weight: 700; font-size: 1rem; color: var(--text); margin-bottom: 6px; }
    .ad-card .ad-desc { font-size: 0.8rem; color: var(--text-muted); }
    .ad-close { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-full); padding: 6px 16px; font-size: 0.85rem; cursor: pointer; color: var(--text); display: flex; align-items: center; gap: 6px; transition: all var(--transition); font-weight: 600; }
    .ad-close:hover { border-color: var(--accent); color: var(--accent); transform: scale(1.05); }
    .ad-close svg { width: 14px; height: 14px; stroke: currentColor; }
    .ad-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 14px; gap: 12px; }
    .ad-header-left { display: flex; align-items: center; gap: 12px; }
    .ad-header-title { font-weight: 800; font-size: 1rem; color: var(--text); }
    .ad-countdown { background: linear-gradient(135deg, var(--accent), var(--accent-hover)); color: #fff; padding: 4px 12px; border-radius: var(--radius-full); font-size: 0.8rem; font-weight: 700; display: flex; align-items: center; gap: 4px; }
    .ad-countdown svg { width: 14px; height: 14px; stroke: currentColor; }
    .ad-countdown.urgent { background: linear-gradient(135deg, #ff4757, #ff6b6b); animation: countdownPulse 0.5s ease-in-out infinite; }
    @keyframes countdownPulse { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.05); } }
    .ad-scroll-container { display: none; }
    .ad-card.creative { min-width: 140px; }
    .ad-card.creative { background: linear-gradient(145deg, var(--bg-card) 0%, var(--bg) 100%); border-radius: 16px; padding: 18px 16px 14px; text-align: center; border: 1px solid var(--border); transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); cursor: pointer; position: relative; overflow: hidden; }
    .ad-card.creative::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, var(--accent-soft) 0%, transparent 50%); opacity: 0; transition: opacity 0.3s; }
    .ad-card.creative:hover::before { opacity: 1; }
    .ad-card.creative:hover { border-color: var(--accent); transform: translateY(-6px) scale(1.02); box-shadow: 0 12px 30px var(--accent-glow); }
    .ad-card.creative:active { transform: translateY(-3px) scale(1.01); }
    .ad-card-badge { position: absolute; top: 8px; right: 8px; background: linear-gradient(135deg, #ff6b6b, #ff4757); color: #fff; font-size: 0.65rem; font-weight: 800; padding: 3px 6px; border-radius: 6px; letter-spacing: 0.5px; }
    .ad-card-badge.new { background: linear-gradient(135deg, #2ed573, #7bed9f); }
    .ad-card-icon { width: 44px; height: 44px; background: linear-gradient(145deg, var(--accent-soft), var(--accent)); border-radius: 12px; display: flex; align-items: center; justify-content: center; margin: 0 auto 10px; position: relative; z-index: 1; }
    .ad-card-icon svg { width: 22px; height: 22px; color: var(--accent); }
    .ad-card-content { position: relative; z-index: 1; }
    .ad-card-title { font-weight: 800; font-size: 0.95rem; color: var(--text); margin-bottom: 4px; }
    .ad-card-rating { font-size: 0.7rem; color: #ffc107; margin-bottom: 4px; }
    .ad-card-desc { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 10px; }
    .ad-card-btn { background: linear-gradient(135deg, var(--accent), var(--accent-hover)); color: #fff; border: none; padding: 6px 14px; border-radius: 20px; font-size: 0.75rem; font-weight: 700; cursor: pointer; transition: all 0.3s; position: relative; z-index: 1; width: 100%; }
    .ad-card-btn:hover { transform: scale(1.05); box-shadow: 0 4px 12px var(--accent-glow); }
    .expand-ad-btn { position: fixed; bottom: 20px; right: 24px; z-index: 997; background: var(--accent); color: #fff; border: none; padding: 10px 18px; border-radius: var(--radius-full); font-weight: 700; font-size: 0.9rem; cursor: pointer; box-shadow: 0 4px 15px var(--accent-glow); display: none; align-items: center; gap: 6px; transition: all var(--transition); }
    .expand-ad-btn.visible { display: flex; }
    .expand-ad-btn:hover { background: var(--accent-hover); transform: translateY(-2px) scale(1.05); box-shadow: 0 8px 25px var(--accent-glow); }
    .expand-ad-btn svg { width: 16px; height: 16px; stroke: currentColor; }
    .float-contact { position: fixed; top: 50%; right: 30px; transform: translateY(-50%); z-index: 999; display: flex; align-items: center; gap: 12px; background: linear-gradient(135deg, var(--accent), var(--accent-hover)); color: #fff; padding: 12px 20px 12px 16px; border-radius: 50px; box-shadow: 0 8px 30px var(--accent-glow); cursor: pointer; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); font-weight: 700; font-size: 1rem; overflow: hidden; }
    .float-contact::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, var(--accent-hover), var(--accent)); opacity: 0; transition: opacity 0.3s; }
    .float-contact:hover::before { opacity: 1; }
    .float-contact:hover { transform: translateY(-50%) scale(1.05); box-shadow: 0 16px 50px var(--accent-glow); }
    .float-contact:active { transform: translateY(-50%) scale(1.02); }
    .contact-pulse { position: absolute; width: 100%; height: 100%; top: 0; left: 0; border-radius: 50px; background: linear-gradient(135deg, var(--accent), var(--accent-hover)); animation: contactPulse 2s ease-out infinite; z-index: -1; }
    @keyframes contactPulse { 0% { transform: scale(1); opacity: 0.6; } 100% { transform: scale(1.5); opacity: 0; } }
    .contact-icon { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; position: relative; z-index: 1; }
    .contact-icon svg { width: 24px; height: 24px; color: #fff; }
    .contact-text { display: flex; flex-direction: column; gap: 2px; position: relative; z-index: 1; }
    .contact-label { font-size: 0.95rem; line-height: 1; }
    .contact-status { font-size: 0.7rem; opacity: 0.9; font-weight: 500; display: flex; align-items: center; gap: 4px; }
    .contact-online-dot { width: 6px; height: 6px; background: #2ed573; border-radius: 50%; animation: onlinePulse 1.5s ease-in-out infinite; }
    @keyframes onlinePulse { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.6; transform: scale(0.85); } }
    .service-panel { position: fixed; top: 50%; right: 30px; transform: translateY(-50%); z-index: 1001; background: var(--bg-card); border: 1px solid var(--border); border-radius: 20px; padding: 0; box-shadow: 0 20px 60px rgba(0,0,0,0.25); display: none; flex-direction: column; min-width: 280px; max-width: 320px; animation: panelIn 0.3s cubic-bezier(0.4, 0, 0.2, 1); overflow: hidden; }
    .service-panel.active { display: flex; }
    @keyframes panelIn { from { opacity: 0; transform: translateY(-50%) translateX(20px); } to { opacity: 1; transform: translateY(-50%) translateX(0); } }
    .panel-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; background: linear-gradient(135deg, var(--accent), var(--accent-hover)); color: #fff; }
    .panel-title { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 1.05rem; }
    .panel-title-icon { width: 20px; height: 20px; color: #fff; }
    .panel-title-icon svg { width: 100%; height: 100%; }
    .panel-status { display: flex; align-items: center; gap: 6px; font-size: 0.8rem; opacity: 0.9; }
    .status-dot { width: 8px; height: 8px; background: #2ed573; border-radius: 50%; animation: blink 1.5s ease-in-out infinite; }
    @keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
    .panel-divider { height: 1px; background: var(--border); }
    .panel-item { display: flex; align-items: center; gap: 12px; padding: 14px 20px; font-size: 0.95rem; color: var(--text); transition: all 0.2s; cursor: pointer; border-bottom: 1px solid var(--border); }
    .panel-item:last-child { border-bottom: none; }
    .panel-item:hover { background: var(--accent-soft); color: var(--accent); transform: translateX(4px); }
    .panel-item:active { transform: translateX(2px); }
    .panel-item.partner { background: linear-gradient(135deg, var(--accent-soft), transparent); }
    .panel-item.partner:hover { background: var(--accent-soft); color: var(--accent); }
    .panel-icon { width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; background: var(--accent-soft); border-radius: 10px; flex-shrink: 0; transition: all 0.2s; }
    .panel-icon svg { width: 20px; height: 20px; color: var(--accent); }
    .panel-item:hover .panel-icon { background: var(--accent); }
    .panel-item:hover .panel-icon svg { color: #fff; }
    .panel-item-content { flex: 1; display: flex; flex-direction: column; gap: 3px; }
    .panel-item-title { font-weight: 600; font-size: 0.95rem; }
    .panel-item-desc { font-size: 0.75rem; color: var(--text-muted); }
    .panel-arrow { width: 20px; height: 20px; display: flex; align-items: center; justify-content: center; opacity: 0.5; transition: all 0.2s; flex-shrink: 0; }
    .panel-arrow svg { width: 100%; height: 100%; stroke: var(--text-muted); }
    .panel-item:hover .panel-arrow { opacity: 1; transform: translateX(4px); }
    .panel-item:hover .panel-arrow svg { stroke: var(--accent); }
    .reveal { opacity: 0; transform: translateY(40px); transition: all 0.7s cubic-bezier(0.4, 0, 0.2, 1); }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @media (max-width: 1024px) {
      .hero-inner { grid-template-columns: 1fr; text-align: center; }
      .hero-text { align-items: center; }
      .hero-btns { justify-content: center; }
      .hero-visual { order: -1; max-width: 300px; margin: 0 auto; }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .download-grid { grid-template-columns: repeat(3, 1fr); }
      .tutorial-grid { grid-template-columns: repeat(2, 1fr); }
      .member-grid { grid-template-columns: repeat(2, 1fr); }
      .ai-inner { grid-template-columns: 1fr; text-align: center; }
      .ai-list { align-items: center; }
      .ai-mockup { margin: 0 auto; }
      .footer-inner { grid-template-columns: 1fr 1fr; }
      .partner-stats-row { gap: 24px; }
      .partner-stat { min-width: 240px; padding: 28px 24px; gap: 20px; }
      .partner-stat .stat-icon { width: 56px; height: 56px; }
      .partner-stat .stat-icon svg { width: 28px; height: 28px; }
      .partner-stat .big-num { font-size: 2rem; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .nav-toggle { display: flex; }
      .hero { padding: calc(var(--nav-height) + 32px) 16px 48px; }
      .section { padding: 52px 16px; }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .download-grid { grid-template-columns: repeat(2, 1fr); }
      .tutorial-grid { grid-template-columns: 1fr; }
      .grid-3 { grid-template-columns: 1fr; }
      .member-grid { grid-template-columns: 1fr; }
      .hero-illustration { display: none; }
      .footer-inner { grid-template-columns: repeat(3, 1fr); gap: 22px; text-align: center; }
      .footer-col:first-child { grid-column: 1 / -1; margin-bottom: 16px; }
      .partner-stats-row { gap: 20px; flex-direction: column; align-items: center; }
      .partner-stat { min-width: 280px; max-width: 340px; width: 100%; padding: 24px 28px; gap: 20px; }
      .partner-stat .big-num { font-size: 2rem; }
      .partner-stat .stat-icon { width: 52px; height: 52px; }
      .partner-stat .stat-icon svg { width: 26px; height: 26px; }
      .bottom-ad-bar { padding: 14px 16px 12px; }
      .ad-grid { display: flex; overflow-x: auto; gap: 12px; padding-bottom: 4px; -webkit-overflow-scrolling: touch; scroll-behavior: smooth; }
      .ad-grid::-webkit-scrollbar { height: 4px; }
      .ad-grid::-webkit-scrollbar-track { background: var(--border); border-radius: 4px; }
      .ad-grid::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 4px; }
      .ad-card.creative { min-width: 150px; }
      .ad-header { margin-bottom: 10px; }
      .ad-header-title { font-size: 0.9rem; }
      .ad-close { padding: 5px 12px; font-size: 0.75rem; }
      .ad-card.creative { padding: 14px 12px 12px; }
      .ad-card.creative .ad-card-icon { width: 36px; height: 36px; margin-bottom: 8px; }
      .ad-card.creative .ad-card-icon svg { width: 18px; height: 18px; }
      .ad-card.creative .ad-card-title { font-size: 0.85rem; }
      .ad-card.creative .ad-card-rating { font-size: 0.65rem; }
      .ad-card.creative .ad-card-desc { font-size: 0.7rem; margin-bottom: 8px; }
      .ad-card.creative .ad-card-btn { padding: 5px 10px; font-size: 0.7rem; }
      .ad-card.creative .ad-card-badge { font-size: 0.6rem; padding: 2px 5px; }
      .float-contact { top: 50%; right: 16px; transform: translateY(-50%); padding: 10px 16px 10px 14px; font-size: 0.9rem; }
      .float-contact:hover { transform: translateY(-50%) scale(1.05); }
      .contact-icon { width: 36px; height: 36px; }
      .contact-icon svg { width: 20px; height: 20px; }
      .contact-text { display: flex; flex-direction: column; gap: 2px; }
      .contact-label { font-size: 0.85rem; }
      .contact-status { font-size: 0.65rem; }
      .service-panel { top: 50%; right: 16px; transform: translateY(-50%); min-width: 260px; max-width: 320px; }
      .panel-header { padding: 14px 16px; }
      .panel-title { font-size: 1rem; }
      .panel-title-icon { width: 18px; height: 18px; }
      .panel-status { font-size: 0.75rem; }
      .panel-item { padding: 12px 16px; gap: 10px; }
      .panel-icon { width: 32px; height: 32px; }
      .panel-icon svg { width: 18px; height: 18px; }
      .panel-item-content { gap: 2px; }
      .panel-item-title { font-size: 0.9rem; }
      .panel-item-desc { font-size: 0.7rem; }
      .panel-arrow { width: 18px; height: 18px; }
      .expand-ad-btn { right: 20px; bottom: 20px; }
    }
    @media (max-width: 500px) {
      .services-grid { grid-template-columns: 1fr; }
      .download-grid { grid-template-columns: 1fr; }
      .partner-stats-row { gap: 16px; flex-direction: column; align-items: center; }
      .partner-stat { min-width: 280px; max-width: 340px; width: 100%; padding: 22px 24px; gap: 18px; }
      .partner-stat .stat-icon { width: 48px; height: 48px; }
      .partner-stat .stat-icon svg { width: 24px; height: 24px; }
      .partner-stat .big-num { font-size: 2rem; }
      .ad-grid { display: flex; overflow-x: auto; gap: 10px; padding-bottom: 4px; -webkit-overflow-scrolling: touch; scroll-behavior: smooth; }
      .ad-grid::-webkit-scrollbar { height: 3px; }
      .ad-grid::-webkit-scrollbar-track { background: var(--border); border-radius: 3px; }
      .ad-grid::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 3px; }
      .ad-card.creative { min-width: 140px; }
      .ad-header { margin-bottom: 8px; }
      .ad-header-title { font-size: 0.85rem; }
      .ad-close { padding: 4px 10px; font-size: 0.7rem; }
      .float-contact { top: 50%; right: 12px; transform: translateY(-50%); padding: 8px 14px 8px 12px; font-size: 0.85rem; }
      .float-contact:hover { transform: translateY(-50%) scale(1.02); }
      .contact-icon { width: 30px; height: 30px; }
      .contact-icon svg { width: 18px; height: 18px; }
      .contact-text { display: flex; flex-direction: column; gap: 1px; }
      .contact-label { font-size: 0.75rem; }
      .contact-status { font-size: 0.55rem; }
      .service-panel { top: 50%; right: 12px; left: 12px; transform: translateY(-50%); min-width: auto; max-width: none; }
      .panel-header { padding: 12px 14px; }
      .panel-title { font-size: 0.95rem; }
      .panel-title-icon { width: 16px; height: 16px; }
      .panel-status { font-size: 0.7rem; }
      .panel-item { padding: 10px 14px; gap: 8px; }
      .panel-icon { width: 30px; height: 30px; }
      .panel-icon svg { width: 16px; height: 16px; }
      .panel-item-content { gap: 1px; }
      .panel-item-title { font-size: 0.85rem; }
      .panel-item-desc { font-size: 0.65rem; }
      .panel-arrow { width: 16px; height: 16px; }
    }

  /* ==================== 全局优化样式 ==================== */

  /* 平滑滚动 */
  html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  /* 全局选择器优化 */
  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
                 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
  }

  /* 链接优化 */
  a {
    color: var(--accent);
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
  }

  a:hover {
    color: var(--accent-hover);
    transform: translateY(-1px);
  }

  a:focus {
    outline: none;
    box-shadow: 0 0 0 3px var(--accent-soft);
    border-radius: 4px;
  }

  /* 按钮通用样式 */
  button, .btn {
    cursor: pointer;
    border: none;
    outline: none;
    font-family: inherit;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
  }

  button:hover, .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
  }

  button:active, .btn:active {
    transform: translateY(0) scale(0.98);
  }

  /* 图片优化 */
  img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius);
  }

  /* 列表优化 */
  ul, ol {
    list-style: none;
  }

  /* 表单元素优化 */
  input, textarea, select {
    font-family: inherit;
    font-size: inherit;
    outline: none;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 12px 16px;
    background: var(--bg-card);
    color: var(--text);
    transition: all 0.3s ease;
    width: 100%;
  }

  input:focus, textarea:focus, select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 5px var(--accent-soft);
    transform: translateY(-2px);
  }

  input::placeholder, textarea::placeholder {
    color: var(--text-muted);
  }

  /* 标题优化 */
  h1, h2, h3, h4, h5, h6 {
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
  }

  /* 段落优化 */
  p {
    margin-bottom: 16px;
    line-height: 1.7;
  }

  /* 卡片悬停效果增强 */
  .card, [class*="card"] {
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .card:hover, [class*="card"]:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  }

  /* 全局动画关键帧 */
  @keyframes fadeInUp {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  @keyframes fadeInDown {
    from {
      opacity: 0;
      transform: translateY(-30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  @keyframes fadeInLeft {
    from {
      opacity: 0;
      transform: translateX(-30px);
    }
    to {
      opacity: 1;
      transform: translateX(0);
    }
  }

  @keyframes fadeInRight {
    from {
      opacity: 0;
      transform: translateX(30px);
    }
    to {
      opacity: 1;
      transform: translateX(0);
    }
  }

  @keyframes scaleIn {
    from {
      opacity: 0;
      transform: scale(0.8);
    }
    to {
      opacity: 1;
      transform: scale(1);
    }
  }

  @keyframes pulse {
    0%, 100% {
      transform: scale(1);
    }
    50% {
      transform: scale(1.05);
    }
  }

  @keyframes float {
    0%, 100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-10px);
    }
  }

  @keyframes shimmer {
    0% {
      background-position: -200% center;
    }
    100% {
      background-position: 200% center;
    }
  }

  /* 滚动显示动画类 */
  .reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .reveal.active {
    opacity: 1;
    transform: translateY(0);
  }

  .reveal-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .reveal-left.active {
    opacity: 1;
    transform: translateX(0);
  }

  .reveal-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .reveal-right.active {
    opacity: 1;
    transform: translateX(0);
  }

  .reveal-scale {
    opacity: 0;
    transform: scale(0.9);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .reveal-scale.active {
    opacity: 1;
    transform: scale(1);
  }

  /* 工具提示样式 */
  [data-tooltip] {
    position: relative;
  }

  [data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 8px 14px;
    background: rgba(0, 0, 0, 0.85);
    color: #fff;
    font-size: 0.85rem;
    border-radius: 6px;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    pointer-events: none;
    margin-bottom: 10px;
  }

  [data-tooltip]:hover::after {
    opacity: 1;
    visibility: visible;
  }

  /* 加载状态 */
  .loading {
    display: inline-block;
    width: 24px;
    height: 24px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
  }

  @keyframes spin {
    to {
      transform: rotate(360deg);
    }
  }

  /* 骨架屏加载效果 */
  .skeleton {
    background: linear-gradient(
      90deg,
      var(--bg-alt) 25%,
      var(--bg-card) 37%,
      var(--bg-alt) 63%
    );
    background-size: 400% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius);
  }

  @keyframes skeleton-loading {
    0% {
      background-position: 200% 0;
    }
    100% {
      background-position: -200% 0;
    }
  }

  /* 响应式字体大小 */
  html {
    font-size: clamp(14px, 1vw + 0.5rem, 18px);
  }

  /* 打印样式 */
  @media print {
    nav, footer, .bottom-ad-bar, .expand-ad-btn, .float-contact, .service-panel,
    .theme-toggle, .nav-toggle {
      display: none !important;
    }

    body {
      background: white !important;
      color: black !important;
    }

    a {
      color: black !important;
      text-decoration: underline;
    }
  }

  /* 无障碍访问优化 */
  :focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
  }

  /* 减少动画（用户偏好） */
  @media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
      scroll-behavior: auto !important;
    }
  }

  /* 高对比度模式支持 */
  @media (prefers-contrast: high) {
    :root {
      --text: #000000;
      --bg: #ffffff;
      --border: #000000;
      --accent: #0066cc;
    }
  }

  /* 暗色模式增强 */
  @media (prefers-color-scheme: dark) {
    :root[data-theme="auto"] {
      --bg: #0f172a;
      --bg-alt: #1e293b;
      --bg-card: #334155;
      --text: #f1f5f9;
      --text-secondary: #cbd5e1;
      --text-muted: #94a3b8;
      --border: #475569;
      --accent: #f97316;
      --accent-hover: #fb923c;
      --accent-soft: rgba(249,115,22,0.15);
      --accent-glow: rgba(249,115,22,0.35);
    }
  }