:root{--brand:#635bff;--brand-dark:#4b45cc;--bg:#f7f8fb;--card:#fff;--ink:#1f2430;--muted:#6b7280;--line:#e6e8ee;--ok:#16a34a;--warn:#d97706;--bad:#dc2626;--surface-2:#eef0f6;--brand-soft:#ece9ff;--ok-bg:#e6f5ec;--warn-bg:#fbf0e0;--bad-bg:#fce8e8;--danger-border:#f0c9c9;--info-bg:#eef6ff;--info-border:#d6e2ff;--shadow:#1f24300f;--radius:14px}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--brand:#837dff;--brand-dark:#6f68f0;--bg:#14161c;--card:#1c1f28;--ink:#e9ebf2;--muted:#9aa2b2;--line:#2b3039;--surface-2:#272c37;--brand-soft:#2c2950;--shadow:#0006;--ok-bg:#14301f;--warn-bg:#3a2a12;--bad-bg:#3a1a1c;--danger-border:#5a2a2e;--info-bg:#16233a;--info-border:#24406a}}:root[data-theme=dark]{--brand:#837dff;--brand-dark:#6f68f0;--bg:#14161c;--card:#1c1f28;--ink:#e9ebf2;--muted:#9aa2b2;--line:#2b3039;--surface-2:#272c37;--brand-soft:#2c2950;--shadow:#0006;--ok-bg:#14301f;--warn-bg:#3a2a12;--bad-bg:#3a1a1c;--danger-border:#5a2a2e;--info-bg:#16233a;--info-border:#24406a}*{box-sizing:border-box}#root,body,html{height:100%}html{-webkit-text-size-adjust:100%}body{-webkit-font-smoothing:antialiased;background:#f7f8fb;background:var(--bg);color:#1f2430;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,Apple SD Gothic Neo,Segoe UI,Noto Sans KR,Malgun 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env(safe-area-inset-left))}.bottomnav{background:#fff;background:var(--card);border-top:1px solid #e6e8ee;border-top:1px solid var(--line);bottom:0;display:flex;left:0;margin:0 auto;max-width:560px;padding-bottom:env(safe-area-inset-bottom);position:fixed;right:0;z-index:20}.bn-item{align-items:center;color:#6b7280;color:var(--muted);display:flex;flex:1 1;flex-direction:column;font-size:11px;font-weight:600;gap:2px;padding:8px 2px 7px}.bn-item .bn-icon{display:block}.bn-label{white-space:nowrap}.bn-item.active{color:#635bff;color:var(--brand)}.bn-item.active .bn-icon{transform:translateY(-1px)}.muted{color:#6b7280;color:var(--muted)}.small{font-size:13px}.card{background:#fff;background:var(--card);border:1px solid #e6e8ee;border:1px solid var(--line);border-radius:14px;border-radius:var(--radius);margin-bottom:12px;padding:16px}h1{font-size:22px;margin:6px 0 14px}h2{font-size:17px;margin:0 0 8px}.btn{align-items:center;background:#635bff;background:var(--brand);border:none;border-radius:10px;color:#fff;display:inline-flex;font-size:15px;font-weight:600;gap:8px;justify-content:center;padding:12px 18px;width:100%}.btn:hover{background:#4b45cc;background:var(--brand-dark)}.btn:disabled{cursor:default;opacity:.5}.btn.secondary{background:#eef0f6;background:var(--surface-2);color:#1f2430;color:var(--ink)}.btn.ghost{background:#0000;border:1px solid #e6e8ee;border:1px solid var(--line);color:#635bff;color:var(--brand)}.btn.small{font-size:13px;padding:8px 14px;width:auto}.btn.danger{color:#dc2626;color:var(--bad)}.btn.ghost.danger{border-color:#f0c9c9;border-color:var(--danger-border)}.btn.ghost.danger:hover{background:#fce8e8;background:var(--bad-bg)}.icon-btn{align-items:center;background:#0000;border:none;border-radius:8px;color:#6b7280;color:var(--muted);display:inline-flex;justify-content:center;padding:6px}.icon-btn:hover{background:#eef0f6;background:var(--surface-2);color:#1f2430;color:var(--ink)}.icon-btn.danger:hover{background:#fce8e8;background:var(--bad-bg);color:#dc2626;color:var(--bad)}.fb-btn:hover{background:#fbf0e0;background:var(--warn-bg);color:#d97706;color:var(--warn)}.field{margin-bottom:12px}.field label{color:#6b7280;color:var(--muted);display:block;font-size:13px;margin-bottom:5px}input:not([type=checkbox]):not([type=radio]),select,textarea{background:#fff;background:var(--card);border:1px solid #e6e8ee;border:1px solid var(--line);border-radius:10px;color:#1f2430;color:var(--ink);font-family:inherit;font-size:16px;padding:11px 12px;width:100%}input[aria-invalid=true]{border-color:#d97706;border-color:var(--warn)}:focus-visible{outline:2px solid #635bff;outline:2px solid var(--brand);outline-offset:2px}.field textarea{font-family:ui-monospace,monospace;min-height:140px;resize:vertical}.badge{background:#eef0f6;background:var(--surface-2);border-radius:999px;color:#6b7280;color:var(--muted);display:inline-block;font-size:11px;font-weight:700;padding:2px 8px}.badge.brand{background:#ece9ff;background:var(--brand-soft);color:#635bff;color:var(--brand)}.badge.ok{background:#e6f5ec;background:var(--ok-bg);color:#16a34a;color:var(--ok)}.badge.warn{background:#fbf0e0;background:var(--warn-bg);color:#d97706;color:var(--warn)}.badge.bad{background:#fce8e8;background:var(--bad-bg);color:#dc2626;color:var(--bad)}.row{align-items:center;display:flex;gap:10px;justify-content:space-between}.stack>*+*{margin-top:10px}.progressbar{background:#eef0f6;background:var(--surface-2);border-radius:999px;height:8px;overflow:hidden}.progressbar>span{background:#635bff;background:var(--brand);display:block;height:100%;transition:width .3s}.error{background:#fce8e8;background:var(--bad-bg);border-radius:10px;color:#dc2626;color:var(--bad);font-size:14px;margin-bottom:12px;padding:10px 12px}.player{background:#f7f8fb;background:var(--bg);display:flex;flex-direction:column;min-height:100vh;min-height:100dvh}.player-top{padding:calc(14px + env(safe-area-inset-top)) calc(18px + env(safe-area-inset-right)) 14px calc(18px + env(safe-area-inset-left))}.player-body{align-items:center;display:flex;flex:1 1;flex-direction:column;justify-content:center;padding:24px;text-align:center}.player-foot{padding:18px calc(18px + env(safe-area-inset-right)) calc(18px + env(safe-area-inset-bottom)) calc(18px + env(safe-area-inset-left))}.wordcard .word{font-size:clamp(32px,11vw,44px);font-weight:800;letter-spacing:-1px;overflow-wrap:anywhere}.wordcard .word.spell-letters{font-size:clamp(22px,7vw,32px);letter-spacing:0;line-height:1.3;word-break:break-word}.wordcard .cue-label{min-height:20px}.wordcard .translation-line{color:#635bff;color:var(--brand);font-size:22px;font-weight:600;margin-top:12px;min-height:30px;overflow-wrap:anywhere}.cue-slot{align-items:center;display:flex;height:100px;justify-content:center;margin-top:8px}.cue-slot .countdown-ring{margin:0}.cue-hint{align-items:center;color:#635bff;color:var(--brand);display:inline-flex;font-size:15px;font-weight:600;gap:8px}.switch{background:#eef0f6;background:var(--surface-2);border:none;border-radius:999px;flex:0 0 auto;height:26px;position:relative;transition:background .15s;width:44px}.switch.on{background:#635bff;background:var(--brand)}.switch-knob{background:#fff;border-radius:50%;height:20px;left:3px;position:absolute;top:3px;transition:transform .15s;width:20px}.switch.on .switch-knob{transform:translateX(18px)}.wordcard .pos{color:#6b7280;color:var(--muted);font-size:15px;margin-top:4px}.wordcard .translation{color:#635bff;color:var(--brand);font-size:22px;font-weight:600;margin-top:12px}.step-label{color:#6b7280;color:var(--muted);font-size:13px;font-weight:700;letter-spacing:1px;margin-bottom:18px;text-transform:uppercase}.dots{display:flex;gap:10px;justify-content:center;margin-top:22px}.dots .dot{background:#eef0f6;background:var(--surface-2);border-radius:50%;height:16px;transition:transform .2s,background .2s;width:16px}.dots .dot.on{background:#635bff;background:var(--brand);transform:scale(1.15)}.spellbox{flex-wrap:wrap;gap:6px;margin:18px 0}.spellbox,.spellbox .slot{display:flex;justify-content:center}.spellbox .slot{align-items:center;border-bottom:3px solid #e6e8ee;border-bottom:3px solid var(--line);font-size:26px;font-weight:700;height:44px;width:34px}.spellbox .slot.filled{animation:pop .18s;border-color:#635bff;border-color:var(--brand)}@keyframes pop{0%{transform:scale(1.4)}to{transform:scale(1)}}.shake{animation:shake .3s}@keyframes shake{0%,to{transform:translateX(0)}25%{transform:translateX(-7px)}75%{transform:translateX(7px)}}.example .sentence{font-size:clamp(18px,5.5vw,22px);line-height:1.5;overflow-wrap:anywhere}.example .sentence mark{background:#fff0a6;border-radius:4px;color:#1f2430;padding:0 3px}.example .trans{color:#6b7280;color:var(--muted);font-size:15px;margin-top:10px}.audio-btn{align-items:center;background:#635bff;background:var(--brand);border:none;border-radius:50%;color:#fff;display:flex;font-size:28px;height:72px;justify-content:center;margin:8px auto;width:72px}.audio-btn.playing{animation:pulse 1s infinite}@keyframes pulse{0%,to{box-shadow:0 0 0 0 #635bff66}50%{box-shadow:0 0 0 12px #635bff00}}.mode-toggle{background:#eef0f6;background:var(--surface-2);border-radius:999px;display:inline-flex;padding:3px}.mode-toggle button{align-items:center;background:#0000;border:none;border-radius:999px;color:#6b7280;color:var(--muted);display:inline-flex;font-size:13px;font-weight:600;gap:4px;padding:6px 14px;white-space:nowrap}.mode-toggle button svg{flex:0 0 auto}.mode-toggle button.active{background:#fff;background:var(--card);box-shadow:0 1px 3px #00000014;color:#635bff;color:var(--brand)}.player-top .row{flex-wrap:wrap;row-gap:8px}@media (max-width:480px){.mode-toggle button{font-size:12px;padding:6px 9px}}.start-overlay{align-items:center;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#141622b8;cursor:pointer;display:flex;inset:0;justify-content:center;padding:calc(20px + env(safe-area-inset-top)) 20px calc(20px + env(safe-area-inset-bottom));position:fixed;z-index:50}.start-cta{color:#fff;text-align:center}.start-cta h2{color:#fff;margin:6px 0}.start-cta .muted{color:#c9cbdd}.start-icon{align-items:center;background:#635bff;background:var(--brand);border-radius:50%;box-shadow:0 8px 30px #635bff80;color:#fff;display:flex;font-size:36px;height:84px;justify-content:center;margin:0 auto 14px;width:84px}.countdown-ring{height:66px;margin:18px auto 0;position:relative;width:66px}.countdown-ring svg{transform:rotate(-90deg)}.cr-track{fill:none;stroke:#eef0f6;stroke:var(--surface-2);stroke-width:5}.cr-fill{fill:none;stroke:#635bff;stroke:var(--brand);stroke-width:5;stroke-linecap:round;animation:cr-empty linear forwards}@keyframes cr-empty{0%{stroke-dashoffset:0}to{stroke-dashoffset:163.36}}.cr-label{font-size:24px;inset:0;justify-content:center;position:absolute}.cr-label,.summary-word{align-items:center;display:flex}.summary-word{border-bottom:1px solid #e6e8ee;border-bottom:1px solid var(--line);gap:10px;justify-content:space-between;padding:10px 0}.summary-word>span{min-width:0;overflow-wrap:anywhere}.grade{font-weight:800}.grade.g4,.grade.g5{color:#16a34a;color:var(--ok)}.grade.g3{color:#d97706;color:var(--warn)}.grade.g1,.grade.g2{color:#dc2626;color:var(--bad)}.center{text-align:center}.spinner{animation:spin .8s linear infinite;border:3px solid #e6e8ee;border-top-color:#635bff;border:3px solid var(--line);border-radius:50%;border-top-color:var(--brand);height:28px;margin:40px auto;width:28px}@keyframes spin{to{transform:rotate(1turn)}}.dropzone{background:#f7f8fb;background:var(--bg);border:2px dashed #e6e8ee;border:2px dashed var(--line);border-radius:14px;border-radius:var(--radius);color:#6b7280;color:var(--muted);cursor:pointer;padding:30px 18px;text-align:center;transition:border-color .15s ease,background .15s ease,transform .05s ease}.dropzone.drag,.dropzone:hover{border-color:#635bff;border-color:var(--brand)}.dropzone.drag{background:#ece9ff;background:var(--brand-soft);color:#635bff;color:var(--brand);transform:scale(1.01)}.dropzone.busy{cursor:default;opacity:.65}.dropzone .dz-icon{display:block;font-size:30px;margin-bottom:8px}.dropzone .dz-main{color:#1f2430;color:var(--ink);font-weight:600}.dropzone.drag .dz-main{color:#635bff;color:var(--brand)}.dropzone .dz-sub{font-size:12px;margin-top:4px}.file-chip{align-items:center;background:#eef0f6;background:var(--surface-2);border:1px solid #e6e8ee;border:1px solid var(--line);border-radius:999px;color:#1f2430;color:var(--ink);display:inline-flex;font-size:13px;gap:8px;padding:5px 6px 5px 12px}.file-chip button{background:#0000;border:none;color:#6b7280;color:var(--muted);cursor:pointer;font-size:16px;line-height:1;padding:0 4px}.file-chip button:hover{color:#dc2626;color:var(--bad)}.level-chips{display:flex;flex-wrap:wrap;gap:6px}.chip{background:#fff;background:var(--card);border:1px solid #e6e8ee;border:1px solid var(--line);border-radius:999px;color:#1f2430;color:var(--ink);cursor:pointer;font-size:12px;font-weight:600;padding:5px 11px}.chip:disabled{cursor:default;opacity:.4}.chip.on{border-color:#635bff;border-color:var(--brand);box-shadow:0 0 0 2px #635bff2e}.lv-A1{--lv:#1f9d57;--lv-soft:#e7f6ec}.lv-A2{--lv:#12a15a;--lv-soft:#d9f2e4}.lv-B1{--lv:#2563eb;--lv-soft:#e6efff}.lv-B2{--lv:#1d4ed8;--lv-soft:#dbe7ff}.lv-C1{--lv:#7c3aed;--lv-soft:#efe7ff}.lv-C2{--lv:#6d28d9;--lv-soft:#f3e8ff}.lv-none{--lv:var(--muted);--lv-soft:var(--surface-2)}.badge.lv-A1,.badge.lv-A2,.badge.lv-B1,.badge.lv-B2,.badge.lv-C1,.badge.lv-C2,.badge.lv-none{background:var(--lv-soft);color:var(--lv)}.chip.lv-A1,.chip.lv-A2,.chip.lv-B1,.chip.lv-B2,.chip.lv-C1,.chip.lv-C2,.chip.lv-none{background:#fff;background:var(--card);color:var(--lv)}.chip.lv-A1.on,.chip.lv-A2.on,.chip.lv-B1.on,.chip.lv-B2.on,.chip.lv-C1.on,.chip.lv-C2.on,.chip.lv-none.on{background:var(--lv);border-color:var(--lv);box-shadow:none;color:#fff}.wordpick{border:1px solid #e6e8ee;border:1px solid var(--line);border-radius:10px;max-height:320px;overflow-y:auto}.wordpick-row{align-items:center;border-bottom:1px solid #e6e8ee;border-bottom:1px solid var(--line);cursor:pointer;display:flex;font-size:15px;gap:10px;padding:9px 12px}.wordpick-row:last-child{border-bottom:none}.wordpick-row input{flex:0 0 auto;width:auto}.wordpick-row .wp-text{flex:1 1;opacity:.55;overflow-wrap:anywhere}.wordpick-row.on .wp-text{font-weight:600;opacity:1}.wordpick-row .badge{flex:0 0 auto}.notice{background:#eef6ff;background:var(--info-bg);border:1px solid #d6e2ff;border:1px solid var(--info-border);border-radius:10px;color:#4b45cc;color:var(--brand-dark);font-size:13px;margin-bottom:10px;padding:9px 12px}.pref-head{align-items:center;display:flex;gap:10px;justify-content:space-between}.pref-label{font-size:15px;font-weight:700}.pref-caption{color:#6b7280;color:var(--muted);font-size:12.5px;line-height:1.4;margin-top:4px}.stepper{align-items:center;display:inline-flex;flex:0 0 auto;gap:8px}.stepper .btn.ghost.small{font-size:18px;height:38px;padding:0;width:38px}.stepper-val{font-feature-settings:"tnum";font-size:16px;font-variant-numeric:tabular-nums;min-width:22px;text-align:center}.settings-sheet{max-width:430px}.pref-step{align-items:flex-start;border-top:1px solid #e6e8ee;border-top:1px solid var(--line);display:flex;gap:10px;padding:14px 0}.pref-step:first-of-type{border-top:none;padding-top:4px}.pref-no{align-items:center;background:#ece9ff;background:var(--brand-soft);border-radius:50%;color:#4b45cc;color:var(--brand-dark);display:flex;flex:0 0 auto;font-size:12px;font-weight:800;height:22px;justify-content:center;margin-top:2px;width:22px}.hf-settings .pref-row{padding:6px 0}.hf-settings .pref-row+.pref-row{border-top:1px solid #e6e8ee;border-top:1px solid var(--line)}.mode-grid{grid-gap:10px;align-items:stretch;display:grid;gap:10px;grid-template-columns:1fr 1fr}.mode-card{align-items:flex-start;background:#fff;background:var(--card);display:flex;flex-direction:column;gap:3px;height:100%;padding:14px;text-align:left;width:100%}.mode-card .mode-icon{color:#635bff;color:var(--brand);display:inline-flex;margin-bottom:4px}.btn-icon{align-items:center;display:inline-flex;gap:8px;justify-content:center}.quiz-item{display:flex;flex-direction:column;gap:16px}.quiz-prompt{padding:8px 0;text-align:center}.quiz-prompt .word{color:#1f2430;color:var(--ink);font-size:30px;font-weight:800}.cloze-sentence{color:#1f2430;color:var(--ink);font-size:18px;line-height:1.6}.quiz-choices{grid-gap:10px;display:grid;gap:10px}.btn.choice{background:#fff;background:var(--card);border:1px solid #e6e8ee;border:1px solid var(--line);color:#1f2430;color:var(--ink);font-weight:600;padding:14px;text-align:center}.btn.choice:hover:not(:disabled){border-color:#635bff;border-color:var(--brand)}.btn.choice.correct{background:#e6f5ec;background:var(--ok-bg);border-color:#16a34a;border-color:var(--ok);color:#16a34a;color:var(--ok)}.btn.choice.wrong{background:#fce8e8;background:var(--bad-bg);border-color:#dc2626;border-color:var(--bad);color:#dc2626;color:var(--bad)}.btn.choice.sel{border-color:#635bff;border-color:var(--brand);box-shadow:0 0 0 2px #635bff2e}.btn.choice.matched{opacity:.35}.match-grid{grid-gap:10px;display:grid;gap:10px;grid-template-columns:1fr 1fr}.match-col{grid-gap:8px;align-content:start;display:grid;gap:8px}.modal-backdrop{align-items:center;background:#14182380;display:flex;inset:0;justify-content:center;padding:20px;position:fixed;z-index:100}.modal{background:#fff;background:var(--card);border-radius:14px;border-radius:var(--radius);box-shadow:0 10px 40px #00000040;max-width:380px;padding:20px;width:100%}.fb-cat{background:#f7f8fb;background:var(--bg);border:1px solid #e6e8ee;border:1px solid var(--line);border-radius:10px;color:#1f2430;color:var(--ink);cursor:pointer;font-size:14px;padding:10px 12px;text-align:left}.fb-cat.on{border-color:#635bff;border-color:var(--brand);box-shadow:0 0 0 2px #635bff2e;color:#635bff;color:var(--brand);font-weight:600}.row.start{justify-content:flex-start}.row.end{justify-content:flex-end}.row.wrap{flex-wrap:wrap;row-gap:8px}.row>.grow{flex:1 1;min-width:0;overflow-wrap:anywhere}.stack-sm>*+*{margin-top:8px}.section-title{align-items:center;display:flex;justify-content:space-between;margin:18px 0 10px}.section-title h2{margin:0}.page-lead{color:#6b7280;color:var(--muted);font-size:13px;margin:-6px 0 14px}.auth-hero{margin:32px 0 20px;text-align:center}.auth-hero 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