:root{--witness-red: #DC2626;--witness-red-light: #EF4444;--witness-red-dark: #B91C1C;--accent-blue: #3B82F6;--success-green: #22C55E;--warning-amber: #F59E0B;--background: #0A0A0A;--surface-dark: #1A1A1A;--surface-elevated: #262626;--border: #333333;--text-primary: #F5F5F4;--text-secondary: #A3A3A3;--text-tertiary: #737373;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-8: 32px;--space-12: 48px;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-pill: 9999px;--font-sans: "DM Sans", "Inter", system-ui, -apple-system, sans-serif;--font-display: "Newsreader", Georgia, serif;--font-mono: ui-monospace, "Consolas", monospace;--transition-fast: .15s ease;--transition-normal: .2s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);background-color:var(--background);color:var(--text-primary);min-height:100vh;line-height:1.5}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}.hidden{display:none!important}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.text-display-large{font-size:28px;font-weight:600;line-height:1.2}.text-display{font-size:24px;font-weight:500;line-height:1.3}.text-headline{font-size:20px;font-weight:600;line-height:1.3}.text-title{font-size:18px;font-weight:500;line-height:1.4}.text-body-large{font-size:18px;font-weight:400;line-height:1.5}.text-body{font-size:16px;font-weight:400;line-height:1.5}.text-body-small{font-size:14px;font-weight:400;line-height:1.5}.text-caption{font-size:13px;font-weight:500;line-height:1.4}.text-secondary{color:var(--text-secondary)}.text-tertiary{color:var(--text-tertiary)}.text-error{color:var(--witness-red)}.text-center{text-align:center}#app{min-height:100vh;display:flex;flex-direction:column}.header{position:sticky;top:0;z-index:100;background-color:var(--background);border-bottom:1px solid var(--border);height:64px}.header-content{max-width:800px;margin:0 auto;padding:0 var(--space-4);height:100%;display:flex;align-items:center;justify-content:space-between}#main-content{flex:1;display:flex;flex-direction:column}.container{width:100%;max-width:600px;margin:0 auto;padding:var(--space-6)}.container-wide{max-width:800px}.logo{display:flex;align-items:center;gap:var(--space-2);font-size:18px;font-weight:700;color:var(--text-primary);text-decoration:none;letter-spacing:.05em}.logo-dot{width:12px;height:12px;background:var(--witness-red);border-radius:50%;animation:pulse 2s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.logo-large{font-size:24px}.logo-large .logo-dot{width:16px;height:16px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);height:48px;padding:0 var(--space-6);font-family:inherit;font-size:16px;font-weight:500;line-height:1;text-decoration:none;border-radius:var(--radius-md);border:none;cursor:pointer;transition:background-color var(--transition-fast),border-color var(--transition-fast),opacity var(--transition-fast);-webkit-tap-highlight-color:transparent}.btn:focus-visible{outline:2px solid var(--witness-red);outline-offset:2px}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background-color:var(--witness-red);color:#fff}.btn-primary:hover:not(:disabled){background-color:var(--witness-red-light)}.btn-primary:active:not(:disabled){background-color:var(--witness-red-dark)}.btn-secondary{background-color:transparent;color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover:not(:disabled){background-color:var(--surface-elevated)}.btn-text{height:auto;padding:var(--space-2);background:none;color:var(--accent-blue);font-weight:400}.btn-text:hover:not(:disabled){text-decoration:underline}.btn-icon{width:44px;height:44px;padding:0;background:none;border:none;border-radius:var(--radius-md);color:var(--text-secondary);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background-color var(--transition-fast),color var(--transition-fast)}.btn-icon:hover{background-color:var(--surface-elevated);color:var(--text-primary)}.btn-icon:focus-visible{outline:2px solid var(--witness-red);outline-offset:2px}.btn-block{width:100%}.form-group{margin-bottom:var(--space-4)}.form-label{display:block;font-size:13px;font-weight:500;color:var(--text-secondary);margin-bottom:var(--space-2)}.form-input{width:100%;height:48px;padding:0 var(--space-4);font-family:inherit;font-size:16px;color:var(--text-primary);background-color:var(--surface-elevated);border:1px solid var(--border);border-radius:var(--radius-md);transition:border-color var(--transition-fast)}.form-input::placeholder{color:var(--text-tertiary)}.form-input:focus{outline:none;border-color:var(--witness-red)}.form-input.error{border-color:var(--witness-red)}.form-input:disabled{opacity:.5;cursor:not-allowed}.input-wrapper{position:relative}.input-toggle{position:absolute;right:var(--space-2);top:50%;transform:translateY(-50%);width:40px;height:40px;padding:0;background:none;border:none;color:var(--text-tertiary);cursor:pointer;display:flex;align-items:center;justify-content:center}.input-toggle:hover{color:var(--text-secondary)}.form-hint{font-size:13px;color:var(--text-tertiary);margin-top:var(--space-1)}.form-error{font-size:13px;color:var(--witness-red);margin-top:var(--space-1)}.card{background-color:var(--surface-dark);border:1px solid var(--border);border-radius:var(--radius-lg);padding:var(--space-5);transition:border-color var(--transition-fast),background-color var(--transition-fast)}.card-clickable{cursor:pointer}.card-clickable:hover{border-color:var(--witness-red);background-color:#1f1f1f}.card-clickable:focus-visible{outline:2px solid var(--witness-red);outline-offset:2px}.share-card{display:flex;align-items:center;gap:var(--space-4)}.share-avatar{width:48px;height:48px;background-color:var(--surface-elevated);border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center;font-weight:600;color:var(--text-secondary);flex-shrink:0}.share-info{flex:1;min-width:0}.share-name{font-size:16px;font-weight:500;color:var(--text-primary);margin-bottom:var(--space-1)}.share-meta{font-size:14px;color:var(--text-secondary)}.share-arrow{color:var(--text-tertiary);flex-shrink:0}.video-card{display:flex;gap:var(--space-4)}.video-thumbnail{width:120px;height:68px;background-color:var(--surface-elevated);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;flex-shrink:0}.video-thumbnail svg{color:var(--text-tertiary)}.video-info{flex:1;min-width:0}.video-date{font-size:16px;font-weight:500;color:var(--text-primary);margin-bottom:var(--space-1)}.video-duration{font-size:14px;color:var(--text-secondary)}.dropdown-menu{position:fixed;top:60px;right:var(--space-4);background-color:var(--surface-dark);border:1px solid var(--border);border-radius:var(--radius-md);padding:var(--space-2);min-width:160px;z-index:200;box-shadow:0 4px 12px #00000080}.dropdown-item{width:100%;padding:var(--space-3) var(--space-4);font-family:inherit;font-size:14px;color:var(--text-primary);background:none;border:none;border-radius:var(--radius-sm);text-align:left;cursor:pointer;transition:background-color var(--transition-fast)}.dropdown-item:hover{background-color:var(--surface-elevated)}.empty-state{text-align:center;padding:var(--space-12) var(--space-6)}.empty-state-icon{width:64px;height:64px;margin:0 auto var(--space-6);color:var(--text-tertiary)}.empty-state-title{font-size:20px;font-weight:600;margin-bottom:var(--space-2)}.empty-state-description{font-size:14px;color:var(--text-secondary);max-width:280px;margin:0 auto}.error-state{text-align:center;padding:var(--space-12) var(--space-6)}.error-state-icon{width:64px;height:64px;margin:0 auto var(--space-6);color:var(--witness-red)}.spinner{display:inline-block;width:24px;height:24px;border:2px solid var(--border);border-top-color:var(--witness-red);border-radius:50%;animation:spin .8s linear infinite}.spinner-large{width:48px;height:48px;border-width:3px}@keyframes spin{to{transform:rotate(360deg)}}.loading-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--space-12);gap:var(--space-4)}.loading-text{font-size:14px;color:var(--text-secondary)}.progress-bar{height:8px;background-color:var(--border);border-radius:var(--radius-pill);overflow:hidden}.progress-fill{height:100%;background-color:var(--witness-red);transition:width .3s ease}.progress-text{font-size:14px;color:var(--text-secondary);text-align:center;margin-top:var(--space-2)}.auth-screen{min-height:100vh;display:flex;flex-direction:column;justify-content:center;padding:var(--space-6)}.auth-container{width:100%;max-width:400px;margin:0 auto}.auth-header{text-align:center;margin-bottom:var(--space-8)}.auth-title{font-size:24px;font-weight:600;margin-bottom:var(--space-2)}.auth-subtitle{font-size:14px;color:var(--text-secondary)}.auth-form{margin-bottom:var(--space-6)}.auth-footer{text-align:center;font-size:14px;color:var(--text-secondary)}.auth-footer a{color:var(--accent-blue);text-decoration:none}.auth-footer a:hover{text-decoration:underline}.auth-divider{display:flex;align-items:center;gap:var(--space-4);margin:var(--space-6) 0;color:var(--text-tertiary);font-size:13px}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background-color:var(--border)}.auth-legal{font-size:13px;color:var(--text-tertiary);text-align:center;margin-top:var(--space-4)}.auth-legal a{color:var(--text-secondary)}.back-link{display:inline-flex;align-items:center;gap:var(--space-2);color:var(--text-secondary);text-decoration:none;font-size:14px;margin-bottom:var(--space-6)}.back-link:hover{color:var(--text-primary)}.landing-screen{min-height:100vh;display:flex;flex-direction:column;justify-content:center;padding:var(--space-6)}.landing-container{width:100%;max-width:400px;margin:0 auto;text-align:center}.landing-logo{margin-bottom:var(--space-8)}.landing-title{font-size:24px;font-weight:500;margin-bottom:var(--space-2)}.landing-subtitle{font-size:14px;color:var(--text-secondary);margin-bottom:var(--space-8)}.landing-actions{display:flex;flex-direction:column;gap:var(--space-3);margin-bottom:var(--space-8)}.landing-security{display:flex;align-items:center;justify-content:center;gap:var(--space-2);font-size:13px;color:var(--text-tertiary)}.landing-security svg{width:16px;height:16px}.player-screen{min-height:100vh;display:flex;flex-direction:column;background-color:#000}.player-header{padding:var(--space-4);display:flex;align-items:center;gap:var(--space-4)}.player-container{flex:1;display:flex;flex-direction:column;justify-content:center;padding:0 var(--space-4)}.video-player{width:100%;max-height:70vh;border-radius:var(--radius-md);background-color:#000}.player-info{padding:var(--space-4);color:var(--text-secondary);font-size:14px}.decryption-progress{text-align:center;padding:var(--space-8)}.decryption-progress .spinner{margin-bottom:var(--space-4)}.list-header{padding:var(--space-6) var(--space-6) var(--space-4);max-width:800px;margin:0 auto;width:100%}.list-title{font-size:24px;font-weight:600}.list-content{padding:0 var(--space-6) var(--space-6);max-width:800px;margin:0 auto;width:100%}.card-list{display:flex;flex-direction:column;gap:var(--space-3)}.verify-icon{width:64px;height:64px;margin:0 auto var(--space-6);color:var(--text-secondary)}.verify-email{color:var(--text-primary);font-weight:500}.verify-tips{text-align:left;margin:var(--space-6) 0;padding-left:var(--space-4)}.verify-tips li{color:var(--text-secondary);font-size:14px;margin-bottom:var(--space-2)}@media (max-width: 767px){.container{padding:var(--space-4)}.list-header,.list-content{padding-left:var(--space-4);padding-right:var(--space-4)}.video-thumbnail{width:100px;height:56px}}@media (min-width: 768px){.auth-screen,.landing-screen{justify-content:center}}@media (min-width: 1024px){.header-content,.list-header,.list-content{max-width:1000px}}