: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}.app-shell{min-height:100vh;display:flex;flex-direction:column}.app-header{display:flex;align-items:center;gap:14px;padding:14px 20px;border-bottom:.5px solid var(--ink-line)}.burger-btn{display:none;flex-direction:column;justify-content:center;gap:4px;width:32px;height:32px;flex-shrink:0;background:none;border:none;cursor:pointer;padding:0}.burger-btn span{display:block;width:100%;height:2px;background:var(--text-on-ink);border-radius:2px}.app-title{flex:1;min-width:0}.app-title .eyebrow{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--text-muted-on-ink);margin:0 0 2px}.app-title h1{font-family:var(--font-display);font-weight:700;font-size:20px;margin:0;color:var(--text-on-ink)}.profile-menu{position:relative;flex-shrink:0}.profile-btn{width:36px;height:36px;border-radius:50%;border:.5px solid var(--ink-line);background:var(--ink-soft);cursor:pointer;padding:0;overflow:hidden;display:flex;align-items:center;justify-content:center}.profile-avatar{width:100%;height:100%;object-fit:cover}.profile-fallback{color:var(--text-on-ink);font-size:14px;font-weight:600}.profile-dropdown{position:absolute;top:calc(100% + 8px);right:0;background:var(--ink-soft);border:.5px solid var(--ink-line);border-radius:8px;padding:10px;min-width:200px;display:flex;flex-direction:column;gap:2px;z-index:30;box-shadow:0 12px 24px #0006}.profile-dropdown .profile-email{margin:0 0 6px;font-size:12px;color:var(--text-muted-on-ink);word-break:break-all}.profile-dropdown button{background:none;border:none;color:var(--text-on-ink);font-size:13px;text-align:left;padding:7px 6px;cursor:pointer;border-radius:4px}.profile-dropdown button:hover{background:var(--ink-line)}.status-line{text-align:center;color:var(--text-muted-on-ink);font-size:13px;margin-bottom:1.5rem}.status-line.error{color:var(--shu)}.app-body{flex:1;display:flex;min-height:0}.nav-backdrop{display:none}.deck-nav{width:220px;flex-shrink:0;padding:20px 12px;display:flex;flex-direction:column;gap:6px;border-right:.5px solid var(--ink-line)}.deck-nav-item{background:transparent;border:.5px solid transparent;border-radius:8px;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-nav-item .deck-label{display:block;font-weight:500;color:inherit;margin-bottom:2px}.deck-nav-item .deck-count{display:block;font-size:12px;opacity:.8}.deck-nav-item .deck-seen{display:block;font-size:11px;opacity:.6}.deck-nav-item.active{background:var(--washi);color:var(--text-on-washi);border-color:var(--washi-line)}.deck-nav-item.active .deck-count{color:var(--shu-dark)}.deck-nav-item.active .deck-seen{color:var(--text-on-washi)}.app-main{flex:1;min-width:0;padding:24px 20px 60px;display:flex;flex-direction:column;align-items:center}.app-main>*{width:100%;max-width:640px}.main-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:1rem;flex-wrap:wrap}.active-deck-title{font-family:var(--font-display);font-size:20px;margin:0;color:var(--text-on-ink)}.mode-toggle{display:flex;gap:8px}.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)}.syllabary-panel{align-items:stretch;padding:1.5rem 1rem}.syllabary-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;width:100%}.syllabary-n-row{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;width:100%;margin-top:6px}.syllabary-cell{aspect-ratio:1;display:flex;flex-direction:column;align-items:center;justify-content:center;overflow:hidden;border-radius:6px;border:1px solid var(--washi-line);background:#fffdf7;font-family:inherit;cursor:pointer;padding:0;transition:transform .1s ease}.syllabary-cell:hover{transform:scale(1.05)}.syllabary-cell:active{transform:scale(.96)}.syllabary-cell.empty{border:none;background:none;cursor:default}.syllabary-cell.empty:hover{transform:none}.syllabary-cell.seen{border-color:var(--ai);background:#e6ecf4}.syllabary-cell.mastered{border-color:var(--shu);background:#f6e2df}.syllabary-kana{font-family:var(--font-display);font-size:22px;color:var(--text-on-washi);line-height:1}.syllabary-romaji{font-size:10px;color:#8a8168;margin-top:2px}@media (max-width: 520px){.syllabary-kana{font-size:clamp(18px,9vw,34px)}.syllabary-romaji{font-size:clamp(7px,2.4vw,11px)}}.signin-panel{gap:1rem;text-align:center}.signin-title{font-family:var(--font-display);color:var(--text-on-washi);font-size:22px;margin:0}.signin-text{font-size:13px;line-height:1.6;color:var(--text-on-washi);max-width:440px;margin:0}.google-btn{display:inline-flex;align-items:center;gap:10px;background:#fff;border:1px solid #dadce0;border-radius:4px;padding:10px 16px;font-family:"Roboto",var(--font-body);font-size:14px;font-weight:500;color:#3c4043;cursor:pointer}.google-btn:hover{box-shadow:0 1px 3px #0003}@media (max-width: 520px){.card-prompt{font-size:64px}.quiz-question{font-size:46px}.quiz-options{grid-template-columns:1fr}}@media (max-width: 780px){.burger-btn{display:flex}.app-title .eyebrow{display:none}.app-title h1{font-size:17px}.deck-nav{position:fixed;top:0;left:0;height:100vh;width:260px;max-width:80vw;background:var(--ink);border-right:.5px solid var(--ink-line);padding-top:76px;overflow-y:auto;transform:translate(-100%);transition:transform .2s ease;z-index:40}.deck-nav.open{transform:translate(0)}.nav-backdrop{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;opacity:0;pointer-events:none;transition:opacity .2s ease;z-index:35}.nav-backdrop.open{opacity:1;pointer-events:auto}.main-toolbar{justify-content:center;text-align:center}}