:root{--bg: #0f1117;--bg-2: #161a23;--surface: #1c2230;--surface-2: #232b3b;--border: #2c3446;--text: #e8edf6;--muted: #8b97ad;--accent: #6ea8fe;--accent-2: #9b8cff;--good: #3ecf8e;--hard: #f2c14e;--again: #f06a6a;--easy: #4fc3f7;--radius: 14px;--shadow: 0 8px 30px rgba(0, 0, 0, .35)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:radial-gradient(1200px 600px at 80% -10%,#1b2440 0%,var(--bg) 55%);color:var(--text);font-family:Inter,system-ui,-apple-system,Hiragino Kaku Gothic ProN,Noto Sans JP,sans-serif;-webkit-font-smoothing:antialiased}.app{max-width:720px;margin:0 auto;min-height:100%;padding-bottom:76px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:16px 18px;position:sticky;top:0;z-index:10;background:#0f1117d1;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}.brand{font-weight:700;font-size:18px;cursor:pointer;letter-spacing:.3px}.brand-mark{color:var(--accent);margin-right:6px}.brand-accent{color:var(--accent-2)}.lang-tabs{display:flex;gap:4px}.lang-tab{border:1px solid var(--border);background:var(--surface);color:var(--muted);padding:6px 10px;border-radius:999px;cursor:pointer;font-size:14px;transition:.15s}.lang-tab.on{color:var(--text);border-color:var(--accent);background:var(--surface-2)}.content{padding:18px}.card-surface{background:linear-gradient(180deg,var(--surface) 0%,var(--bg-2) 100%);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.btn{border:1px solid var(--border);background:var(--surface-2);color:var(--text);padding:10px 16px;border-radius:10px;cursor:pointer;font-size:15px;font-weight:600;transition:transform .05s,background .15s,border-color .15s}.btn:hover{border-color:var(--accent)}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.5;cursor:default}.btn.primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));border:none;color:#0d1018}.btn.ghost{background:transparent}.btn.lg{padding:14px 22px;font-size:16px;width:100%;margin-top:18px}.btn.sm{padding:4px 8px;font-size:13px}.btn.danger{border-color:var(--again);color:var(--again)}.muted{color:var(--muted)}.section-title{margin:26px 4px 12px;font-size:14px;text-transform:uppercase;letter-spacing:1px;color:var(--muted)}.hero{padding:24px}.hero-counts{display:flex;align-items:center;gap:20px}.big-count{font-size:56px;font-weight:800;line-height:1;background:linear-gradient(135deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}.hero-sub div{margin:2px 0}.lang-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.lang-card{padding:16px}.lang-head{display:flex;align-items:center;gap:8px;margin-bottom:10px}.lang-flag{font-size:22px}.lang-name{font-weight:600}.due-badge{margin-left:auto;background:var(--accent);color:#0d1018;border-radius:999px;padding:1px 9px;font-size:13px;font-weight:700}.bar{height:7px;background:var(--bg);border-radius:999px;overflow:hidden}.bar-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--accent-2))}.lang-stats{font-size:13px;margin-top:8px}.study{display:flex;flex-direction:column;gap:16px}.study-top{display:flex;align-items:center;justify-content:space-between}.progress-pill{color:var(--muted);font-size:14px}.flashcard{padding:28px 22px;min-height:280px;display:flex;flex-direction:column;gap:14px;cursor:pointer}.fc-meta{display:flex;flex-wrap:wrap;gap:6px}.chip{background:var(--surface-2);border:1px solid var(--border);color:var(--muted);padding:2px 9px;border-radius:999px;font-size:12px}.chip.subtle{opacity:.8}.fc-front{font-size:30px;font-weight:700;margin-top:6px}.fc-ipa{color:var(--accent);font-size:16px}.reveal{align-self:flex-start;margin-top:auto}.fc-back{border-top:1px solid var(--border);padding-top:14px;margin-top:6px}.fc-answer{font-size:22px;font-weight:600}.fc-example{font-style:italic;color:var(--text);margin:12px 0 0}.fc-ex-tr{color:var(--muted);font-style:normal}.fc-note{background:var(--bg);border-left:3px solid var(--accent-2);padding:10px 12px;border-radius:0 8px 8px 0;color:#cfd8e8;font-size:14px}.rating-row{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.btn.rate{display:flex;flex-direction:column;align-items:center;gap:3px;padding:12px 6px}.rate-label{font-size:14px}.rate-interval{font-size:12px;color:var(--muted);font-weight:500}.btn.rate.again{border-color:var(--again)}.btn.rate.hard{border-color:var(--hard)}.btn.rate.good{border-color:var(--good)}.btn.rate.easy{border-color:var(--easy)}.session-done{padding:40px 24px;text-align:center}.session-done h2{margin-top:0}.session-done .btn{margin-top:16px}.browser-toolbar{display:flex;gap:10px;margin-bottom:14px}.search{flex:1;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:10px 14px;color:var(--text);font-size:15px}.search::placeholder{color:var(--muted)}.count-line{margin:4px 2px 10px;font-size:13px}.card-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px}.card-row{display:flex;align-items:center;justify-content:space-between;padding:12px 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8px}.bar-col{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;height:100%;gap:6px}.bar-v{width:100%;min-height:3px;background:linear-gradient(180deg,var(--accent),var(--accent-2));border-radius:4px 4px 0 0;transition:height .3s}.bar-x{font-size:10px;color:var(--muted)}.data-actions{display:flex;flex-wrap:wrap;gap:10px;padding:16px}.bottom-nav{position:fixed;bottom:0;left:0;right:0;max-width:720px;margin:0 auto;display:flex;background:#0f1117eb;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-top:1px solid var(--border)}.bottom-nav button{flex:1;background:none;border:none;color:var(--muted);padding:10px 0 12px;font-size:12px;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:3px}.bottom-nav button span{font-size:20px}.bottom-nav button.on{color:var(--accent)}@media (max-width: 480px){.lang-grid{grid-template-columns:1fr}.stat-grid{grid-template-columns:repeat(2,1fr)}.big-count{font-size:46px}}