:root{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-card: #1e293b;--bg-elevated: #334155;--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--accent: #dc2626;--accent-hover: #ef4444;--accent-soft: rgba(220, 38, 38, .15);--success: #22c55e;--warning: #f59e0b;--error: #ef4444;--border: #334155;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-chinese: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px);--nav-height: 64px}*{margin:0;padding:0;box-sizing:border-box}html,body,#root{height:100%;overflow:hidden}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-tap-highlight-color:transparent;-webkit-user-select:none;user-select:none}#root{display:flex;flex-direction:column;padding-top:var(--safe-top);padding-bottom:var(--safe-bottom)}.page{flex:1;overflow-y:auto;overflow-x:hidden;padding:16px;padding-bottom:calc(var(--nav-height) + 16px + var(--safe-bottom));-webkit-overflow-scrolling:touch}.char-display{font-family:var(--font-chinese);font-weight:400}.char-xl{font-size:72px;line-height:1.2}.char-lg{font-size:48px;line-height:1.2}.char-md{font-size:32px;line-height:1.3}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border:none;border-radius:12px;font-size:16px;font-weight:600;cursor:pointer;transition:all .15s ease;touch-action:manipulation}.btn:active{transform:scale(.96)}.btn:disabled{cursor:not-allowed;opacity:.55;transform:none}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover)}.btn-secondary{background:var(--bg-elevated);color:var(--text-primary)}.btn-secondary:hover{background:#475569}.btn-ghost{background:transparent;color:var(--text-secondary)}.btn-ghost:hover{background:var(--bg-elevated);color:var(--text-primary)}.btn-block{width:100%}.btn-sm{padding:8px 16px;font-size:14px;border-radius:8px}.card{background:var(--bg-card);border-radius:16px;padding:20px;border:1px solid var(--border)}.card-message{border-radius:12px;padding:12px 14px;font-size:14px;line-height:1.45}.card-message-success{background:#22c55e24;color:#86efac}.card-message-warning{background:#f59e0b29;color:#fcd34d}.input{width:100%;padding:12px 16px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:12px;color:var(--text-primary);font-size:16px;font-family:var(--font-sans);outline:none;transition:border-color .15s}.input:focus{border-color:var(--accent)}.input::placeholder{color:var(--text-muted)}textarea.input{resize:vertical;min-height:80px}.label{display:block;font-size:13px;font-weight:600;color:var(--text-secondary);margin-bottom:6px;text-transform:uppercase;letter-spacing:.5px}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.rating-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;width:100%}.rating-btn{display:flex;flex-direction:column;align-items:center;gap:4px;padding:14px 8px;border:none;border-radius:12px;cursor:pointer;font-weight:600;font-size:14px;transition:all .15s ease;touch-action:manipulation}.rating-btn:active{transform:scale(.95)}.rating-btn .interval{font-size:11px;font-weight:400;opacity:.7}.rating-btn.again{background:#ef444433;color:#fca5a5}.rating-btn.hard{background:#f59e0b33;color:#fcd34d}.rating-btn.good{background:#22c55e33;color:#86efac}.rating-btn.easy{background:#3b82f633;color:#93c5fd}.bottom-nav{position:fixed;bottom:0;left:0;right:0;height:calc(var(--nav-height) + var(--safe-bottom));padding-bottom:var(--safe-bottom);background:var(--bg-secondary);border-top:1px solid var(--border);display:grid;grid-template-columns:repeat(5,1fr);z-index:100}.nav-item{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;background:none;border:none;color:var(--text-muted);font-size:11px;font-weight:500;cursor:pointer;transition:color .15s;touch-action:manipulation;text-decoration:none}.nav-item.active{color:var(--accent)}.nav-item svg{width:24px;height:24px}.nav-badge{position:absolute;top:4px;right:calc(50% - 20px);background:var(--accent);color:#fff;font-size:10px;font-weight:700;min-width:18px;height:18px;border-radius:9px;display:flex;align-items:center;justify-content:center;padding:0 5px}.text-center{text-align:center}.text-secondary{color:var(--text-secondary)}.text-muted{color:var(--text-muted)}.text-accent{color:var(--accent)}.text-success{color:var(--success)}.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}.mb-1{margin-top:8px}.mb-2{margin-bottom:16px}.gap-1{gap:8px}.gap-2{gap:16px}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.w-full{width:100%}.page-header-row,.section-heading-row,.deck-focus-title-row{display:flex;align-items:center;justify-content:space-between;gap:12px}.section-heading{font-size:16px;font-weight:700}.page-subtitle-chip{display:inline-flex;align-items:center;gap:8px;align-self:flex-start;padding:6px 12px;border-radius:999px;background:#dc262624;color:#fca5a5;font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase}.stats-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.stats-grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}.stat-card{padding:16px;text-align:center}.quick-actions-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:16px}.dashboard-hero{margin-bottom:20px;padding:22px;border-radius:24px;background:radial-gradient(circle at top left,rgba(220,38,38,.16),transparent 38%),linear-gradient(145deg,#1e293bf2,#0f172afa);border:1px solid rgba(148,163,184,.12)}.dashboard-hero-badge{display:inline-flex;padding:6px 12px;border-radius:999px;background:#dc262624;color:#fca5a5;font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;margin-bottom:14px}.dashboard-hero-title{font-size:36px;font-weight:700;line-height:1.1;margin-bottom:8px}.dashboard-hero-copy{max-width:640px;color:var(--text-secondary);font-size:15px;line-height:1.6}.dashboard-sections{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:16px;margin-top:20px}.dashboard-section{min-height:100%}.activity-list,.deck-focus-list,.library-list{display:flex;flex-direction:column;gap:10px}.activity-row,.deck-focus-row,.library-row,.deck-card,.deck-market-row{border:1px solid rgba(148,163,184,.12);border-radius:14px;background:#0f172a4d}.activity-row{display:flex;gap:12px;padding:14px}.activity-icon{width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:14px;font-weight:700;flex-shrink:0}.activity-review{background:#dc262629;color:#fca5a5}.activity-writing{background:#38bdf829;color:#7dd3fc}.activity-copy{min-width:0;flex:1}.activity-copy-top,.library-row-title{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:4px}.activity-meta,.deck-focus-meta,.library-row-meta,.deck-card-metrics,.library-editor-meta{display:flex;flex-wrap:wrap;gap:8px 14px;color:var(--text-muted);font-size:12px;margin-top:8px}.deck-focus-row,.deck-card,.deck-market-row{padding:16px}.deck-focus-row,.deck-market-row{display:flex;align-items:center;justify-content:space-between;gap:16px}.deck-focus-actions,.deck-card-actions,.library-editor-actions{display:flex;flex-wrap:wrap;gap:10px}.deck-card{margin-top:12px}.deck-card-selected{border-color:#38bdf880;background:#38bdf814}.deck-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:14px}.deck-select-check{display:inline-flex;align-items:center;justify-content:center;margin-right:8px}.deck-card-count{font-size:30px;font-weight:700;color:var(--text-primary)}.deck-create-row{display:flex;gap:12px;margin-top:14px}.library-toolbar{margin-top:8px}.library-layout{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:16px;margin-top:16px}.selection-toolbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:8px}.library-list-panel,.library-editor-panel{min-height:100%}.library-row-shell{display:flex;align-items:stretch;gap:10px}.library-row-check{display:flex;align-items:center;justify-content:center}.library-row{width:100%;display:block;padding:14px;color:inherit;text-align:left;border:1px solid rgba(148,163,184,.12);cursor:pointer}.library-row.active{border-color:#dc26268c;background:#dc262614}.library-row.selected{border-color:#38bdf880;background:#38bdf814}.library-row-main{display:flex;align-items:center;gap:14px}.library-row-copy{min-width:0;flex:1}.library-editor-check{margin-top:16px;color:var(--text-secondary);font-size:14px}.library-editor-actions{margin-top:20px}.badge{display:inline-flex;align-items:center;justify-content:center;border-radius:999px;padding:5px 10px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;white-space:nowrap}.badge-neutral{background:#94a3b829;color:#cbd5e1}.badge-custom{background:#38bdf824;color:#7dd3fc}.badge-prebuilt{background:#dc262624;color:#fca5a5}.badge-standalone{background:#f59e0b24;color:#fcd34d}.badge-review,.badge-due{background:#dc262624;color:#fca5a5}.badge-writing,.badge-new{background:#38bdf824;color:#7dd3fc}.badge-learning{background:#f59e0b24;color:#fcd34d}.badge-mastered{background:#22c55e24;color:#86efac}.badge-suspended{background:#94a3b829;color:#cbd5e1}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .25s ease}@keyframes slideUp{0%{opacity:0;transform:translateY(40px)}to{opacity:1;transform:translateY(0)}}.slide-up{animation:slideUp .3s ease}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:48px 24px;gap:16px}.empty-state .emoji{font-size:48px}.pleco-link-row{display:flex;flex-direction:column;align-items:center;gap:8px;margin-bottom:16px}.pleco-link{text-decoration:none}.pleco-link-hint{max-width:240px;color:var(--text-muted);font-size:12px;line-height:1.5;text-align:center}.write-page{display:flex;flex-direction:column;align-items:center;padding-bottom:calc(var(--nav-height) + 16px + var(--safe-bottom))}.write-progress-bar{width:100%;display:flex;align-items:center;gap:10px;margin-bottom:12px;position:relative}.write-progress-fill{flex:1;height:3px;background:var(--bg-elevated);border-radius:2px;overflow:hidden;position:relative}.write-progress-fill:after{content:"";position:absolute;left:0;top:0;height:100%;width:var(--progress, 0%);background:var(--accent);border-radius:2px;transition:width .3s ease}.write-progress-text{font-size:12px;color:var(--text-muted);font-variant-numeric:tabular-nums;flex-shrink:0}.write-prompt{text-align:center;margin-bottom:12px}.write-prompt-label{font-size:12px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:4px}.write-prompt-pinyin{font-size:22px;font-weight:600;color:var(--accent);margin-bottom:2px}.write-prompt-meaning{font-size:15px;line-height:1.5;color:var(--text-secondary);max-height:140px;overflow-y:auto;text-align:left;width:100%}.write-char-slots{display:flex;gap:8px;justify-content:center;margin-bottom:14px}.write-char-slot{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;border:2px solid var(--border);background:var(--bg-secondary);transition:all .3s ease}.write-char-slot.active{border-color:var(--accent);background:var(--accent-soft);transform:scale(1.1)}.write-char-slot.done{border-color:var(--success);background:#22c55e1f}.write-char-slot.flash{animation:charFlash .5s ease}@keyframes charFlash{0%{transform:scale(1.1)}50%{transform:scale(1.25);background:#22c55e4d}to{transform:scale(1)}}.write-char-slot-char{font-family:var(--font-chinese);font-size:22px;color:var(--success)}.write-char-slot-active{font-size:18px;font-weight:700;color:var(--accent)}.write-char-slot-pending{font-size:20px;color:var(--text-muted)}.write-canvas-wrap{width:100%;max-width:300px;margin-bottom:12px}.write-canvas-outer{position:relative;width:100%;aspect-ratio:1;max-width:280px;margin:0 auto;background:var(--bg-elevated);border-radius:16px;border:2px solid var(--border);overflow:hidden;touch-action:none}.write-canvas-outer svg{width:100%!important;height:100%!important}.write-canvas-inner{position:relative;z-index:1}.write-grid{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:0}.write-grid line{stroke:var(--border);stroke-width:.8;stroke-dasharray:6 4;opacity:.6}.write-stroke-counter{display:flex;align-items:center;gap:8px;margin-top:8px;padding:0 4px}.write-stroke-counter-bar{flex:1;height:3px;background:var(--bg-elevated);border-radius:2px;overflow:hidden}.write-stroke-counter-fill{height:100%;background:var(--success);border-radius:2px;transition:width .3s ease}.write-stroke-counter-text{font-size:12px;color:var(--text-muted);font-variant-numeric:tabular-nums;flex-shrink:0}.write-stroke-mistakes{color:var(--warning);font-size:11px}.write-controls{width:100%;max-width:320px;display:flex;flex-direction:column;align-items:center}.write-controls-row{display:flex;gap:12px;justify-content:center;align-items:center}.write-result{width:100%;text-align:center}.write-result-header{margin-bottom:10px}.write-result-score{font-size:18px;font-weight:700}.write-result-score.perfect{color:var(--success)}.write-result-score.good{color:var(--warning)}.write-result-score.poor{color:var(--error)}.write-result-mistakes{display:block;font-size:13px;color:var(--text-muted);margin-top:2px}.write-srs-label{font-size:12px;color:var(--text-muted);margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px}.writing-canvas-container{position:relative;width:100%;max-width:300px;aspect-ratio:1;margin:0 auto;background:var(--bg-elevated);border-radius:16px;border:2px solid var(--border);overflow:hidden}.writing-canvas-container svg{width:100%!important;height:100%!important}.writing-grid{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.writing-grid line{stroke:var(--border);stroke-width:1;stroke-dasharray:4 4}.auth-screen{min-height:100%;display:flex;align-items:center;justify-content:center;padding:24px 16px;background:radial-gradient(circle at top,rgba(220,38,38,.16),transparent 38%),linear-gradient(180deg,#08101d 0%,var(--bg-primary) 45%,#060b14 100%)}.auth-card{width:100%;max-width:420px;padding:24px;border-radius:20px;background:#0f172aeb;border:1px solid rgba(148,163,184,.14);box-shadow:0 24px 60px #02061773;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.auth-badge{display:inline-flex;align-items:center;gap:8px;padding:6px 12px;border-radius:999px;background:#dc262624;color:#fca5a5;font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;margin-bottom:14px}.auth-title{font-size:28px;font-weight:700;line-height:1.15;margin-bottom:10px}.auth-subtitle{color:var(--text-secondary);font-size:14px;line-height:1.6;margin-bottom:20px}.auth-tabs{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;padding:6px;border-radius:14px;background:#33415573;margin-bottom:18px}.auth-tab{border:none;border-radius:10px;background:transparent;color:var(--text-secondary);font-size:14px;font-weight:700;padding:10px 12px;cursor:pointer;transition:all .18s ease}.auth-tab.active{background:#dc26262e;color:#fff}.auth-form{display:flex;flex-direction:column;gap:14px}.auth-captcha-shell{display:flex;flex-direction:column;gap:10px}.auth-captcha-slot{min-height:68px}.auth-help-text{color:var(--text-secondary);font-size:12px;line-height:1.5}.auth-message{border-radius:12px;padding:12px 14px;font-size:14px;line-height:1.45}.auth-message-error{background:#ef444424;color:#fca5a5}.auth-message-success{background:#22c55e24;color:#86efac}.auth-setup-list{display:flex;flex-direction:column;gap:10px}.auth-setup-item{border-radius:12px;padding:12px 14px;background:#33415557;color:var(--text-secondary);font-size:14px;line-height:1.45}@media(max-width:900px){.dashboard-sections,.library-layout{grid-template-columns:1fr}}@media(max-width:720px){.form-grid,.stats-grid-three,.quick-actions-grid{grid-template-columns:1fr}.deck-create-row,.deck-focus-row,.deck-market-row{flex-direction:column;align-items:stretch}.page-header-row,.section-heading-row,.deck-focus-title-row,.deck-card-top,.activity-copy-top,.library-row-title{flex-direction:column;align-items:flex-start}}