:root{--bg:#f7f3ec;--surface:#fffdf9;--surface-2:#efe9df;--text:#2b2723;--muted:#776e64;--line:#e2dacd;--accent:#b8402f;--accent-text:#fffdf9;--indigo:#2f4a6d;--again:#c0392b;--hard:#b7791f;--good:#2f7d4f;--easy:#2f5f9d;--known:#2f7d4f;--learning:#d69e2e;--new:#c9c0b3;--radius:14px;--nav-height:60px;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#1b1a18;--surface:#24221f;--surface-2:#2e2b27;--text:#ece6dc;--muted:#a39a8e;--line:#3a3631;--accent:#e0644f;--accent-text:#1b1a18;--indigo:#9db6d8;--again:#e5675a;--hard:#e0a84a;--good:#5cb07f;--easy:#6f9fdc;--known:#5cb07f;--learning:#e0a84a;--new:#5a544c;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--text);margin:0;font-family:system-ui,Noto Sans TC,Noto Sans CJK TC,sans-serif;font-size:17px;line-height:1.6}:lang(ja){font-family:Noto Sans JP,Noto Sans CJK JP,Hiragino Sans,system-ui,sans-serif}rt{color:var(--muted);font-size:.5em;font-weight:400}a{color:var(--indigo)}h1{margin:.25rem 0 1rem;font-size:1.5rem}h2{margin:1.5rem 0 .5rem;font-size:1.15rem}h3{color:var(--muted);letter-spacing:.05em;margin:1.25rem 0 .4rem;font-size:.85rem;font-weight:600}p{margin:.4rem 0}.page{max-width:640px;padding:16px 16px calc(var(--nav-height) + 32px + env(safe-area-inset-bottom));margin:0 auto}.center{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:12px;min-height:70vh;display:flex}button{font:inherit}.button,button.primary{border:1px solid var(--line);background:var(--surface);min-height:44px;color:var(--text);cursor:pointer;border-radius:999px;justify-content:center;align-items:center;gap:6px;margin:4px 8px 4px 0;padding:8px 18px;text-decoration:none;display:inline-flex}.button.primary,button.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-text);font-weight:600}.button.big{width:100%;min-height:56px;margin:20px 0 0;font-size:1.1rem;display:flex}.button.danger{color:var(--again);border-color:var(--again)}button:disabled{opacity:.5;cursor:default}.link-button{color:var(--indigo);cursor:pointer;background:0 0;border:none;padding:8px 0}.speak{border:1px solid var(--line);background:var(--surface);width:40px;height:40px;color:var(--indigo);cursor:pointer;border-radius:50%;flex:none;justify-content:center;align-items:center;display:inline-flex}.navbar{height:calc(var(--nav-height) + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);background:var(--surface);border-top:1px solid var(--line);z-index:10;grid-template-columns:repeat(5,1fr);display:grid;position:fixed;bottom:0;left:0;right:0}.navbar a{color:var(--muted);justify-content:center;align-items:center;font-size:.95rem;text-decoration:none;display:flex}.navbar a.active{color:var(--accent);font-weight:700}.banner{background:var(--surface-2);border-bottom:1px solid var(--line);margin:0;padding:10px 16px;font-size:.9rem}.back{margin-bottom:4px;text-decoration:none;display:inline-block}.login{flex-direction:column;align-items:center;padding-top:15vh;display:flex}.brand{align-items:baseline;gap:10px;margin:0;font-size:2.6rem;display:flex}.brand small{color:var(--muted);font-size:1rem;font-weight:500}.login-form{flex-direction:column;gap:10px;width:100%;max-width:320px;margin-top:32px;display:flex}.login-form input{letter-spacing:.4em;text-align:center;border-radius:var(--radius);border:1px solid var(--line);background:var(--surface);color:var(--text);padding:12px;font-size:1.6rem}.login-form button.primary{margin:0}.form-error{color:var(--again)}.hint{color:var(--muted);font-size:.9rem}.home-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:20px;display:flex}.countdown{color:var(--muted);margin:0}.countdown strong{color:var(--accent);font-size:1.4rem}.today-link{text-decoration:none}.stats{grid-template-columns:repeat(3,1fr);gap:10px;display:grid}.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);flex-direction:column;align-items:center;padding:14px 8px;display:flex}.stat-value{font-size:1.8rem;font-weight:700;line-height:1.2}.stat-value small{color:var(--muted);font-size:.9rem;font-weight:500}.stat-label{color:var(--muted);font-size:.85rem}.progress{background:var(--surface-2);border-radius:999px;height:10px;margin-top:20px;display:flex;overflow:hidden}.progress-mature{background:var(--known)}.progress-seen{background:var(--learning)}.progress-legend{color:var(--muted);font-size:.85rem}.done{text-align:center;margin-top:24px}.dot{background:var(--new);border-radius:50%;flex:none;width:10px;height:10px;display:inline-block}.dot.mature,.dot.known{background:var(--known)}.dot.seen,.dot.learning{background:var(--learning)}.queue-counts{justify-content:center;gap:16px;margin:0 0 8px;font-size:.85rem;font-weight:700;display:flex}.count.learning{color:var(--again)}.count.due{color:var(--good)}.count.new{color:var(--easy)}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px}.card-meta{flex-wrap:wrap;gap:6px;margin:0 0 8px;display:flex}.card-front{cursor:pointer;flex-direction:column;justify-content:space-between;min-height:45vh;display:flex}.prompt-recognize,.prompt-produce{text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:12px;padding:24px 0;display:flex}.prompt-recognize.item-ja-row{flex-direction:row}.prompt-zh{margin:0;font-size:1.6rem;font-weight:700}.ratings{left:0;right:0;bottom:calc(var(--nav-height) + env(safe-area-inset-bottom));background:var(--bg);border-top:1px solid var(--line);z-index:5;grid-template-columns:repeat(4,1fr);gap:6px;padding:8px 12px;display:grid;position:fixed}.review{padding-bottom:calc(var(--nav-height) + 110px + env(safe-area-inset-bottom))}.rating{color:#fff;cursor:pointer;border:none;border-radius:12px;flex-direction:column;align-items:center;min-height:56px;padding:8px 4px;display:flex}.rating-label{font-weight:700}.rating-interval{opacity:.9;font-size:.75rem}.rating.again{background:var(--again)}.rating.hard{background:var(--hard)}.rating.good{background:var(--good)}.rating.easy{background:var(--easy)}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .rating{color:#1b1a18}}.review-done{text-align:center;padding-top:15vh}.item-ja-row,.example-ja-row{align-items:center;gap:10px;display:flex}.item-ja{font-size:1.6rem;font-weight:700;line-height:1.9}.item-ja.large{font-size:2.1rem}.item-zh{margin:0 0 6px;font-size:1.15rem}.tags{flex-wrap:wrap;gap:6px;margin:6px 0;display:flex}.tag{background:var(--surface-2);color:var(--muted);border-radius:999px;padding:2px 8px;font-size:.75rem}.tag.new{background:var(--easy);color:#fff}.tag.kind-pattern{background:var(--indigo);color:var(--surface)}.tag.kind-phrase{background:var(--accent);color:var(--accent-text)}.note{color:var(--muted);border-left:3px solid var(--line);padding-left:10px;font-size:.92rem}.example{border-top:1px solid var(--line);margin-top:14px}.example-ja{font-size:1.25rem;line-height:2}.example-zh{color:var(--muted)}.tokens{border-collapse:collapse;width:100%;font-size:.95rem}.tokens td{border-bottom:1px solid var(--line);vertical-align:top;padding:6px 4px}.token-ja{white-space:nowrap;width:1%;font-size:1.1rem;line-height:1.9;padding-right:12px!important}.token-role{color:var(--indigo);font-size:.75rem;display:block}.token-gloss{display:block}.grammar,.replies{margin:0;padding-left:1.2em}.grammar li,.replies li{margin-bottom:6px}.reply-ja{font-size:1.05rem;line-height:1.9}.reply-zh{color:var(--muted);margin-top:0}.search{width:100%;font:inherit;border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:999px;padding:10px 14px}.tabs{background:var(--surface-2);border-radius:999px;grid-template-columns:1fr 1fr;margin:16px 0 8px;padding:4px;display:grid}.tabs button{color:var(--muted);cursor:pointer;background:0 0;border:none;border-radius:999px;padding:8px}.tabs button[aria-selected=true]{background:var(--surface);color:var(--text);font-weight:700}.group-list,.item-list{margin:0;padding:0;list-style:none}.group-list a,.item-list a{border-bottom:1px solid var(--line);color:var(--text);align-items:center;gap:10px;padding:12px 4px;text-decoration:none;display:flex}.group-list a{justify-content:space-between}.count-badge{white-space:nowrap;color:var(--muted);background:var(--surface-2);border-radius:999px;flex:none;padding:2px 10px;font-size:.8rem}.list-ja{flex:none;max-width:55%;font-size:1.1rem;line-height:1.9}.list-zh{color:var(--muted);text-overflow:ellipsis;white-space:nowrap;min-width:0;font-size:.9rem;overflow:hidden}.empty{color:var(--muted);text-align:center;padding:24px 0}.card-status ul{padding-left:1.2em}.settings section{border-bottom:1px solid var(--line);padding-bottom:12px}.toast{left:16px;right:16px;bottom:calc(var(--nav-height) + 16px + env(safe-area-inset-bottom));background:var(--text);color:var(--bg);border-radius:var(--radius);text-align:center;padding:12px 16px;position:fixed}.sentence{padding:10px 0}.sentence+.sentence{border-top:1px dashed var(--line)}.breakdown-button{border:1px solid var(--indigo);min-height:32px;color:var(--indigo);cursor:pointer;background:0 0;border-radius:999px;flex:none;padding:2px 12px;font-size:.85rem}dialog.sheet{background:var(--surface);width:100%;max-width:640px;max-height:85vh;color:var(--text);overscroll-behavior:contain;border:none;border-radius:18px 18px 0 0;margin:0 auto;padding:0;animation:.18s ease-out sheet-in;position:fixed;inset:auto 0 0;overflow-y:auto}dialog.sheet::backdrop{background:#00000073}@keyframes sheet-in{0%{opacity:.6;transform:translateY(40px)}to{opacity:1;transform:none}}@media (prefers-reduced-motion:reduce){dialog.sheet{animation:none}}.sheet-body{padding:10px 16px calc(16px + env(safe-area-inset-bottom))}.sheet-handle{background:var(--line);border-radius:999px;width:40px;height:4px;margin:0 auto 12px}.sheet-close{width:100%;margin:16px 0 0}button.token-link{font:inherit;cursor:pointer;background:0 0;border:none;padding:0}.replies{border-left:3px solid var(--line);margin:6px 0 0 12px;padding-left:10px}.replies .example-ja{font-size:1.05rem}.token-link{color:var(--indigo);text-underline-offset:4px;-webkit-text-decoration:underline dotted;text-decoration:underline dotted}.pref-toggle{color:var(--muted);align-items:center;gap:8px;margin-top:12px;font-size:.85rem;display:flex}.turns{margin:16px 0 0;padding:0;list-style:none}.turn{border-radius:var(--radius);border:1px solid var(--line);margin-bottom:10px;padding:8px 12px}.turn.other{background:var(--surface);margin-right:24px}.turn.learner{background:var(--surface-2);margin-left:24px}.turn-speaker{color:var(--muted);margin:0;font-size:.75rem;font-weight:700}.turn.learner .turn-speaker{color:var(--accent)}.turn-prompt strong{font-size:1.15rem}.alternatives h3{margin-top:4px}.dialogue{padding-bottom:calc(var(--nav-height) + 110px + env(safe-area-inset-bottom))}.dialogue-summary{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);color:var(--text);justify-content:space-between;align-items:center;margin-top:16px;padding:14px 16px;text-decoration:none;display:flex}