:root{--bg: #F7F4EE;--bg-elevated: #FFFFFF;--bg-hover: #F0ECE4;--text: #1A1A1A;--text-secondary: #7A756E;--text-tertiary: #A8A29E;--accent: #2D5A3D;--accent-hover: #1F4029;--accent-light: rgba(45, 90, 61, .08);--accent-lighter: rgba(45, 90, 61, .04);--border: #E5E0D8;--border-strong: #D4CEC4;--error: #C44D4D;--error-light: rgba(196, 77, 77, .08);--success: #2D5A3D;--success-light: rgba(45, 90, 61, .08);--font-display: "Fraunces", Georgia, serif;--font-body: "DM Sans", -apple-system, BlinkMacSystemFont, sans-serif;--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--space-3xl: 64px;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--radius-xl: 20px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .06);--shadow-lg: 0 8px 24px rgba(0, 0, 0, .08);--shadow-xl: 0 16px 48px rgba(0, 0, 0, .1);--ease: cubic-bezier(.4, 0, .2, 1);--ease-spring: cubic-bezier(.34, 1.56, .64, 1)}[data-theme=dark]{--bg: #1A1A1A;--bg-elevated: #242424;--bg-hover: #2E2E2E;--text: #E8E4DF;--text-secondary: #9E9A94;--text-tertiary: #6B6762;--accent: #5BA87A;--accent-hover: #7BC496;--accent-light: rgba(91, 168, 122, .12);--accent-lighter: rgba(91, 168, 122, .06);--border: #363636;--border-strong: #4A4A4A;--error: #E07070;--error-light: rgba(224, 112, 112, .12);--success: #5BA87A;--success-light: rgba(91, 168, 122, .12)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-body);background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh;position:relative;overflow-x:hidden}.noise-overlay{position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:9999;opacity:.025;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' 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var(--border-strong);border-radius:var(--radius-xl);padding:var(--space-3xl) var(--space-lg);text-align:center;cursor:pointer;transition:all .3s var(--ease);background:var(--bg-elevated);animation:fadeInUp .6s var(--ease) .1s both}.uploader:hover{border-color:var(--accent);background:var(--accent-lighter)}.uploader.drag-over{border-color:var(--accent);background:var(--accent-light);transform:scale(1.01);box-shadow:var(--shadow-lg)}.uploader__input{position:absolute;top:0;right:0;bottom:0;left:0;opacity:0;cursor:pointer}.uploader__content{pointer-events:none}.uploader__icon{display:inline-flex;align-items:center;justify-content:center;width:64px;height:64px;border-radius:50%;background:var(--accent-light);color:var(--accent);margin-bottom:var(--space-md);transition:transform .3s var(--ease-spring)}.uploader:hover .uploader__icon{transform:translateY(-2px)}.uploader__text{font-size:1.0625rem;color:var(--text);margin-bottom:var(--space-xs)}.uploader__link{color:var(--accent);font-weight:600;text-decoration:underline;text-underline-offset:3px}.uploader__hint{font-size:.875rem;color:var(--text-tertiary)}.file-list{margin-top:var(--space-xl);animation:fadeInUp .4s var(--ease) both}.file-list.hidden{display:none}.file-list__header{display:flex;align-items:center;justify-content:space-between;margin-bottom:var(--space-md)}.file-list__title{font-family:var(--font-display);font-size:1.25rem;font-weight:600;color:var(--text)}.file-list__title span{color:var(--accent)}.file-list__body{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:var(--space-md)}.file-item{position:relative;background:var(--bg-elevated);border-radius:var(--radius-md);border:1px solid var(--border);overflow:hidden;transition:all .25s var(--ease);animation:fadeInScale .35s var(--ease-spring) 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auto;display:flex;align-items:center;justify-content:space-between;gap:var(--space-md)}.action-bar__info span{font-size:.875rem;color:var(--text-secondary);font-weight:500}.action-bar__actions{display:flex;gap:var(--space-sm)}.btn{display:inline-flex;align-items:center;gap:var(--space-sm);padding:10px 20px;border:none;border-radius:var(--radius-md);font-family:var(--font-body);font-size:.875rem;font-weight:600;cursor:pointer;transition:all .2s var(--ease);white-space:nowrap}.btn:disabled{opacity:.4;cursor:not-allowed}.btn--primary{background:var(--accent);color:#fff}.btn--primary:hover:not(:disabled){background:var(--accent-hover);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn--primary:active:not(:disabled){transform:translateY(0)}.btn--secondary{background:var(--bg-hover);color:var(--text);border:1px solid var(--border)}.btn--secondary:hover:not(:disabled){background:var(--border);border-color:var(--border-strong)}.btn--ghost{background:transparent;color:var(--text-secondary);padding:6px 12px}.btn--ghost:hover{background:var(--bg-hover);color:var(--text)}.btn--sm{padding:6px 12px;font-size:.8125rem}@keyframes fadeInUp{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInScale{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.4}}@media (max-width: 640px){.app{padding:var(--space-xl) var(--space-md);padding-bottom:160px}.header__desc br,.hide-mobile{display:none}.uploader{padding:var(--space-xl) var(--space-md)}.file-list__body{grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:var(--space-sm)}.action-bar{padding:var(--space-md)}.action-bar__info{flex-direction:column;align-items:stretch;gap:var(--space-sm)}.action-bar__actions{width:100%}.action-bar__actions .btn{flex:1;justify-content:center}}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:100px}::-webkit-scrollbar-thumb:hover{background:var(--text-tertiary)}::selection{background:var(--accent-light);color:var(--accent)}.topbar{display:flex;align-items:center;justify-content:space-between;padding:var(--space-md) var(--space-lg);max-width:860px;margin:0 auto}.topbar__links{display:flex;gap:var(--space-sm);align-items:center}.topbar__link{font-size:13px;font-weight:500;color:var(--text-tertiary);text-decoration:none;transition:color 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var(--ease);z-index:100;text-align:center}.topbar__wechat:hover .topbar__wechat-popup,.topbar__wechat:focus-within .topbar__wechat-popup{opacity:1;visibility:visible;transform:translateY(0)}.topbar__qrcode{width:160px;height:160px;border-radius:var(--radius-sm);display:block}.topbar__qrcode-tip{font-size:11px;color:var(--text-tertiary);margin-top:8px;margin-bottom:0}.features-section{padding:var(--space-3xl) var(--space-md);background:var(--bg-elevated);border-top:1px solid var(--border)}.features-container{max-width:960px;margin:0 auto}.features-title{font-family:var(--font-display);font-size:28px;font-weight:700;color:var(--text-primary);text-align:center;margin-bottom:8px}.features-subtitle{font-size:15px;color:var(--text-secondary);text-align:center;margin-bottom:40px}.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--space-lg);margin-bottom:48px}.feature-card{background:var(--bg-primary);border:1px solid var(--border);border-radius:12px;padding:24px 20px;transition:transform .2s,box-shadow .2s}.feature-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #00000014}.feature-icon{width:44px;height:44px;border-radius:10px;background:var(--accent-light);color:var(--accent);display:flex;align-items:center;justify-content:center;margin-bottom:16px}.feature-title{font-size:15px;font-weight:600;color:var(--text-primary);margin-bottom:6px}.feature-desc{font-size:13px;color:var(--text-secondary);line-height:1.5;margin:0}.keywords-cloud{padding-top:32px;border-top:1px solid var(--border)}.keywords-title{font-size:14px;font-weight:600;color:var(--text-tertiary);text-align:center;margin-bottom:16px;letter-spacing:.5px}.keywords-tags{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}.keyword-tag{font-size:12px;color:var(--text-secondary);background:var(--bg-primary);border:1px solid var(--border);border-radius:100px;padding:5px 14px;transition:all .2s}.keyword-tag:hover{color:var(--accent);border-color:var(--accent);background:var(--accent-light)}@media (max-width: 768px){.features-grid{grid-template-columns:repeat(2,1fr);gap:var(--space-md)}.features-title{font-size:22px}}@media (max-width: 480px){.features-grid{grid-template-columns:1fr}.features-section{padding:var(--space-xl) var(--space-md)}}