:root{--ink: #1c1b1f;--ink-soft: #26242a;--ink-line: #38353c;--washi: #f3ecdd;--washi-line: #dcd0b4;--shu: #b23a2e;--shu-dark: #8c2c22;--matcha: #6e8b4f;--ai: #4a6693;--gold: #c4972f;--text-on-ink: #efe9dc;--text-muted-on-ink: #a79e8c;--text-on-washi: #2a2620;--font-display: "Shippori Mincho", serif;--font-body: "Zen Kaku Gothic New", sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--ink);color:var(--text-on-ink);font-family:var(--font-body)}#root{min-height:100vh;display:flex;justify-content:center;padding:2.5rem 1.25rem 4rem}.app{width:100%;max-width:720px}.app-header{margin-bottom:2rem;text-align:center}.app-header .eyebrow{font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--text-muted-on-ink);margin:0 0 6px}.app-header h1{font-family:var(--font-display);font-weight:700;font-size:32px;margin:0 0 6px;color:var(--text-on-ink)}.app-header p{margin:0;color:var(--text-muted-on-ink);font-size:14px}.status-line{text-align:center;color:var(--text-muted-on-ink);font-size:13px;margin-bottom:1.5rem}.status-line.error{color:var(--shu)}.deck-tabs{display:flex;gap:6px;margin-bottom:1rem;overflow-x:auto}.deck-tab{flex:1;min-width:140px;background:var(--ink-soft);border:.5px solid var(--ink-line);border-bottom:none;border-radius:10px 10px 0 0;padding:10px 12px;cursor:pointer;color:var(--text-muted-on-ink);font-family:var(--font-body);font-size:14px;text-align:left;transition:background .15s ease,color .15s ease}.deck-tab .deck-label{display:block;font-weight:500;color:inherit;margin-bottom:2px}.deck-tab .deck-count{display:block;font-size:12px;opacity:.8}.deck-tab.active{background:var(--washi);color:var(--text-on-washi);border-color:var(--washi-line)}.deck-tab.active .deck-count{color:var(--shu-dark)}.mode-toggle{display:flex;justify-content:center;gap:8px;margin-bottom:1.5rem}.mode-toggle button{background:transparent;border:.5px solid var(--ink-line);color:var(--text-muted-on-ink);border-radius:999px;padding:6px 16px;font-size:13px;font-family:var(--font-body);cursor:pointer}.mode-toggle button.active{background:var(--shu);border-color:var(--shu);color:var(--washi)}.paper-panel{position:relative;background:var(--washi);background-image:repeating-linear-gradient(0deg,var(--washi-line) 0,var(--washi-line) 1px,transparent 1px,transparent 48px),repeating-linear-gradient(90deg,var(--washi-line) 0,var(--washi-line) 1px,transparent 1px,transparent 48px);background-position:center;border-radius:4px;border:.5px solid var(--washi-line);padding:2.5rem 1.5rem;min-height:320px;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:0 18px 40px #00000059}.hanko{position:absolute;top:16px;right:16px;width:56px;height:56px;border-radius:50%;border:2.5px solid var(--shu);color:var(--shu);display:flex;flex-direction:column;align-items:center;justify-content:center;font-family:var(--font-display);transform:rotate(-6deg);line-height:1}.hanko .n{font-size:17px;font-weight:700}.hanko .d{font-size:9px;letter-spacing:.05em;margin-top:2px}.card-prompt{font-family:var(--font-display);font-weight:700;color:var(--text-on-washi);font-size:88px;line-height:1;text-align:center;cursor:pointer;-webkit-user-select:none;user-select:none}.speak-btn{display:block;margin:.5rem auto 0;font-size:22px;line-height:1;background:none;border:none;cursor:pointer;padding:4px}.speak-btn:hover{opacity:.7}.card-prompt.small{font-size:44px}.card-answer{margin-top:1.25rem;text-align:center;min-height:48px}.card-answer .romaji{font-size:22px;font-weight:500;color:var(--shu-dark)}.card-answer .meaning{font-size:14px;color:var(--text-on-washi);margin-top:4px}.card-answer .hint{font-size:13px;color:#8a8168;font-style:italic}.card-controls{display:flex;gap:10px;justify-content:center;margin-top:1.5rem;flex-wrap:wrap}.btn{font-family:var(--font-body);font-size:14px;border-radius:8px;padding:10px 18px;border:.5px solid var(--ink-line);background:var(--ink-soft);color:var(--text-on-ink);cursor:pointer}.btn:hover{border-color:var(--text-muted-on-ink)}.btn.primary{background:var(--shu);border-color:var(--shu);color:var(--washi)}.btn.matcha{background:var(--matcha);border-color:var(--matcha);color:var(--washi)}.btn.ai{background:var(--ai);border-color:var(--ai);color:var(--washi)}.btn:disabled{opacity:.5;cursor:default}.quiz-question{font-family:var(--font-display);font-size:64px;font-weight:700;color:var(--text-on-washi);text-align:center;margin-bottom:1.5rem}.quiz-question.small{font-size:36px}.quiz-options{display:grid;grid-template-columns:1fr 1fr;gap:10px;width:100%}.quiz-option{font-family:var(--font-body);font-size:14px;padding:12px 10px;border-radius:8px;border:1.5px solid var(--washi-line);background:#fffdf7;color:var(--text-on-washi);cursor:pointer;text-align:center}.quiz-option.correct{border-color:var(--matcha);background:#e9f0e0}.quiz-option.incorrect{border-color:var(--shu);background:#f6e2df}.quiz-option:disabled{cursor:default}.quiz-feedback{margin-top:1rem;min-height:24px;font-size:14px;text-align:center;color:var(--text-on-washi)}@media (max-width: 520px){.card-prompt{font-size:64px}.quiz-question{font-size:46px}.quiz-options{grid-template-columns:1fr}}