:root{--color-bg: #faf7f2;--color-bg-2: #f3eee5;--color-surface: #ffffff;--color-surface-2: #f6f2ea;--color-border: #e2d9c9;--color-border-strong: #cfc2ab;--color-text: #23201b;--color-text-muted: #7b7264;--color-primary: #9a5b2c;--color-primary-hover: #834c23;--color-primary-soft: #f5e9df;--color-accent: #3f7a55;--color-accent-soft: #e6f0e8;--color-danger: #b23b34;--color-danger-soft: #fbeae8;--color-info: #3a6b96;--radius: 12px;--radius-sm: 7px;--shadow-sm: 0 1px 2px rgba(40, 30, 15, .07);--shadow-md: 0 10px 30px rgba(40, 30, 15, .12);--nav-height: 58px;--font-body: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--font-read: Georgia, "Iowan Old Style", "Times New Roman", serif;--font-mono: "SFMono-Regular", ui-monospace, "Cascadia Mono", Menlo, Consolas, monospace;color-scheme:light}@media(prefers-color-scheme:dark){:root{--color-bg: #17150f;--color-bg-2: #1e1b14;--color-surface: #221e17;--color-surface-2: #2b261d;--color-border: #3a3328;--color-border-strong: #564c3c;--color-text: #f2ece1;--color-text-muted: #a2967f;--color-primary: #d69152;--color-primary-hover: #e8a666;--color-primary-soft: #3a2a1a;--color-accent: #7fb08c;--color-accent-soft: #24301f;--color-danger: #dd7a70;--color-danger-soft: #3a221f;--color-info: #7fa8ce;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);--shadow-md: 0 12px 32px rgba(0, 0, 0, .5);color-scheme:dark}}*{box-sizing:border-box}body{margin:0;font-family:var(--font-body);background:var(--color-bg);color:var(--color-text);-webkit-font-smoothing:antialiased;line-height:1.55}h1,h2,h3,h4{font-weight:650;letter-spacing:-.015em;color:var(--color-text);line-height:1.25}h1{font-size:28px;margin:0 0 8px}h2{font-size:20px;margin:32px 0 12px}h3{font-size:15px;margin:18px 0 8px}p{margin:0 0 12px}a{color:var(--color-primary);text-decoration:none}a:hover{text-decoration:underline}code{font-family:var(--font-mono);font-size:.9em;background:var(--color-surface-2);padding:1px 5px;border-radius:4px}button{font-family:inherit;font-size:14px;line-height:1.2;cursor:pointer}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:9px 16px;border-radius:var(--radius-sm);border:1px solid var(--color-border-strong);background:var(--color-surface);color:var(--color-text);font-weight:550;text-decoration:none;transition:background-color .15s ease,border-color .15s ease,transform .05s ease}.btn:hover:not(:disabled){background:var(--color-surface-2);border-color:var(--color-text-muted);text-decoration:none}.btn:active:not(:disabled){transform:translateY(1px)}.btn:disabled{opacity:.45;cursor:not-allowed}.btn--primary{background:var(--color-primary);border-color:var(--color-primary);color:#fff;font-weight:650}.btn--primary:hover:not(:disabled){background:var(--color-primary-hover);border-color:var(--color-primary-hover)}.btn--ghost{background:transparent}.btn--small{padding:6px 11px;font-size:13px}.btn--large{padding:13px 24px;font-size:15px}.btn--block{width:100%}.btn--danger{color:var(--color-danger);border-color:var(--color-danger);background:var(--color-surface)}.btn--danger:hover:not(:disabled){background:var(--color-danger-soft);border-color:var(--color-danger)}.kbd{font-family:var(--font-mono);font-size:11px;padding:2px 6px;border-radius:4px;border:1px solid currentColor;opacity:.55;font-weight:400}input,select,textarea{font-family:inherit;font-size:14px;padding:9px 11px;border-radius:var(--radius-sm);border:1px solid var(--color-border-strong);background:var(--color-surface);color:var(--color-text)}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-soft)}input[type=range]{padding:0;accent-color:var(--color-primary);width:100%}input[type=checkbox]{width:16px;height:16px;accent-color:var(--color-primary)}.page{max-width:780px;margin:28px auto;padding:0 20px 90px}.page--narrow{max-width:560px}.page-header{margin-bottom:24px}.page-eyebrow{font-size:12px;font-weight:650;letter-spacing:.08em;text-transform:uppercase;color:var(--color-primary);margin:0 0 6px}.page-emblem{margin-right:10px}.page-native{font-family:var(--font-read);font-style:italic;font-weight:400;font-size:.7em;color:var(--color-text-muted);margin-left:10px;letter-spacing:0}.page-description{font-family:var(--font-read);font-size:16px;line-height:1.65;color:var(--color-text);max-width:62ch}.section-head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;margin:34px 0 14px}.section-head h1,.section-head h2{margin:0}.muted{color:var(--color-text-muted);font-size:13.5px}.footnote{margin-top:20px;font-size:13px}.state-message{padding:24px 0}.error{color:var(--color-danger);background:var(--color-danger-soft);border:1px solid var(--color-danger);border-radius:var(--radius-sm);padding:10px 13px;font-size:13.5px;margin:12px 0}.callout{background:var(--color-primary-soft);border:1px solid var(--color-border);border-left:3px solid var(--color-primary);border-radius:var(--radius-sm);padding:12px 14px;font-size:14px;margin:16px 0}.callout--quiet{background:var(--color-surface-2);border-left-color:var(--color-border-strong);color:var(--color-text-muted);font-size:13.5px}.tag{display:inline-block;font-size:11px;font-weight:650;letter-spacing:.03em;padding:2px 7px;border-radius:999px;background:var(--color-surface-2);border:1px solid var(--color-border);color:var(--color-text-muted);white-space:nowrap;margin-left:8px;vertical-align:middle}.tag--read{color:var(--color-accent);border-color:var(--color-accent)}.app-nav{display:flex;justify-content:space-between;align-items:center;padding:0 20px;height:var(--nav-height);background:var(--color-surface);border-bottom:1px solid var(--color-border);position:sticky;top:0;z-index:100}.app-nav-brand{display:inline-flex;align-items:center;gap:9px;font-weight:700;font-size:16px;color:var(--color-text);white-space:nowrap}.app-nav-brand:hover{text-decoration:none}.brand-mark{color:var(--color-primary);flex-shrink:0}.app-nav-user{position:relative}.user-button{display:inline-flex;align-items:center;gap:8px;background:transparent;border:1px solid transparent;border-radius:var(--radius-sm);padding:5px 9px;color:var(--color-text)}.user-button:hover{background:var(--color-surface-2);border-color:var(--color-border)}.user-avatar{width:26px;height:26px;border-radius:50%;background:var(--color-primary);color:#fff;display:grid;place-items:center;font-size:12px;font-weight:700}.user-name{font-size:14px;font-weight:550}.user-caret{font-size:10px;color:var(--color-text-muted)}.dropdown{position:absolute;right:0;top:calc(100% + 6px);min-width:200px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-sm);box-shadow:var(--shadow-md);padding:5px;z-index:200}.dropdown-item{display:block;width:100%;text-align:left;padding:8px 10px;border-radius:5px;font-size:14px;color:var(--color-text);background:transparent;border:none}.dropdown-item:hover{background:var(--color-surface-2);text-decoration:none}.crumbs{font-size:13px;color:var(--color-text-muted);margin-bottom:18px;display:flex;flex-wrap:wrap;gap:2px}.crumb{display:inline-flex;gap:6px;align-items:center}.crumb a{color:var(--color-text-muted)}.crumb a:hover{color:var(--color-primary)}.crumb-current{color:var(--color-text);font-weight:550}.crumb-sep{opacity:.4;margin:0 4px}.auth-page{max-width:400px;margin:70px auto;padding:0 20px 60px;text-align:center}.auth-brand{font-size:22px;font-weight:700;color:var(--color-text);letter-spacing:-.02em}.auth-brand:hover{text-decoration:none}.auth-tagline{color:var(--color-text-muted);font-size:14px;margin:8px 0 26px}.form-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:26px 24px;box-shadow:var(--shadow-sm);text-align:left}.form-title{font-size:19px;margin:0 0 18px}.form{display:flex;flex-direction:column;gap:14px}.field{display:flex;flex-direction:column;gap:6px;font-size:13px;font-weight:600;color:var(--color-text-muted)}.field--inline{flex-direction:row;align-items:center;gap:10px;margin:16px 0}.field-hint{font-weight:400;font-size:12.5px;color:var(--color-text-muted)}.auth-alt{margin-top:16px}.home-header{margin-bottom:22px}.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:8px}.stat-tile{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:14px 12px;text-align:center}.stat-value{display:block;font-size:24px;font-weight:700;color:var(--color-primary);line-height:1.1}.stat-label{display:block;font-size:11.5px;color:var(--color-text-muted);margin-top:4px;letter-spacing:.02em}.card-grid{display:grid;gap:12px}.tile{display:flex;gap:16px;align-items:flex-start;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:18px;color:var(--color-text);transition:border-color .15s ease,box-shadow .15s ease,transform .08s ease}.tile:hover{text-decoration:none;border-color:var(--color-primary);box-shadow:var(--shadow-sm);transform:translateY(-1px)}.tile-emblem{font-size:34px;line-height:1}.tile-body{display:flex;flex-direction:column;gap:5px;min-width:0}.tile-title{font-size:17px;font-weight:650}.tile-native{font-family:var(--font-read);font-style:italic;font-weight:400;color:var(--color-text-muted);margin-left:9px;font-size:14px}.tile-author{font-size:13px;color:var(--color-text-muted);font-style:italic}.tile-blurb{font-size:14px;color:var(--color-text);line-height:1.5}.tile-meta{font-size:12.5px;color:var(--color-text-muted);margin-top:3px}.row-list{list-style:none;padding:0;margin:0;display:grid;gap:8px}.row{display:flex;align-items:flex-start;gap:16px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:15px 16px;color:var(--color-text);transition:border-color .15s ease,background-color .15s ease}.row:hover{text-decoration:none;border-color:var(--color-primary)}.row-number{flex-shrink:0;width:34px;height:34px;display:grid;place-items:center;border-radius:50%;background:var(--color-primary-soft);color:var(--color-primary);font-weight:700;font-size:14px}.row-number--minor{width:auto;min-width:40px;height:auto;border-radius:999px;padding:3px 9px;font-size:12.5px;font-family:var(--font-mono)}.row-body{display:flex;flex-direction:column;gap:4px;min-width:0;flex:1}.row-title{font-weight:650;font-size:15px}.row-summary{font-size:13.5px;color:var(--color-text-muted);line-height:1.5}.row-meta{font-size:12.5px;color:var(--color-text-muted);margin-top:2px}.row-chevron{color:var(--color-text-muted);font-size:20px;align-self:center}.progress{display:flex;align-items:center;gap:10px}.progress-track{flex:1;height:7px;border-radius:999px;background:var(--color-bg-2);border:1px solid var(--color-border);overflow:hidden}.progress--compact{margin-top:6px}.progress--compact .progress-track{height:5px}.progress-fill{height:100%;background:var(--color-accent);border-radius:999px;transition:width .3s ease}.progress-label{font-size:12.5px;color:var(--color-text-muted);white-space:nowrap}.book-progress,.section-progress{margin:16px 0 4px}.tabs{display:flex;gap:4px;border-bottom:1px solid var(--color-border);margin:26px 0 24px}.tab{background:transparent;border:none;border-bottom:2px solid transparent;padding:10px 16px;font-size:15px;font-weight:600;color:var(--color-text-muted);display:inline-flex;align-items:baseline;gap:8px;margin-bottom:-1px}.tab:hover{color:var(--color-text)}.tab--active{color:var(--color-primary);border-bottom-color:var(--color-primary)}.tab-meta{font-size:11.5px;font-weight:500;opacity:.75}.study{font-family:var(--font-read);max-width:64ch}.study-prose{font-size:16.5px;line-height:1.7;margin:0 0 18px}.study-rule{background:var(--color-surface);border:1px solid var(--color-border);border-left:3px solid var(--color-primary);border-radius:var(--radius-sm);padding:15px 18px;margin:22px 0}.study-rule-title{font-family:var(--font-body);font-size:13px;font-weight:700;letter-spacing:.03em;text-transform:uppercase;color:var(--color-primary);margin:0 0 7px}.study-rule p{margin:0;font-size:16px;line-height:1.65}.study-note{display:flex;gap:11px;background:var(--color-surface-2);border-radius:var(--radius-sm);padding:13px 15px;margin:20px 0;font-size:15px;line-height:1.6;color:var(--color-text-muted)}.study-note p{margin:0}.study-note-mark{color:var(--color-primary);flex-shrink:0;font-size:14px;line-height:1.7}.study-vocab,.study-examples,.study-table-wrap{margin:26px 0}.study-vocab-title{font-family:var(--font-body);font-size:14px;font-weight:700;margin:0 0 6px}.study-vocab-intro{font-size:14.5px;color:var(--color-text-muted);margin:0 0 12px;line-height:1.6}.vocab-list,.example-list{list-style:none;padding:0;margin:0}.vocab-entry,.example-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr) auto;gap:12px;align-items:baseline;padding:7px 10px;border-radius:5px}.vocab-entry:nth-child(odd),.example-row:nth-child(odd){background:var(--color-surface-2)}.vocab-target,.example-target{font-weight:600;font-size:16px}.vocab-target--han,.vocab-target--kana{font-size:20px}.vocab-translit,.example-translit{font-family:var(--font-body);font-size:13.5px;color:var(--color-text-muted);font-style:italic}.vocab-translation,.example-translation{font-style:italic;color:var(--color-text-muted);font-size:15px}.vocab-entry:has(.vocab-translit),.example-row:has(.example-translit){grid-template-columns:minmax(0,1fr) minmax(0,.8fr) minmax(0,1fr) auto}.vocab-speak{background:transparent;border:none;color:var(--color-text-muted);padding:2px 4px;border-radius:4px;display:inline-flex;align-items:center;opacity:.5;transition:opacity .15s ease,color .15s ease}.vocab-speak:hover{opacity:1;color:var(--color-primary)}.table-scroll{overflow-x:auto}.study-table{border-collapse:collapse;width:100%;font-size:15.5px}.study-table th{text-align:left;font-family:var(--font-body);font-size:12px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--color-text-muted);padding:7px 12px 7px 0;border-bottom:1px solid var(--color-border-strong);white-space:nowrap}.study-table td{padding:7px 12px 7px 0;border-bottom:1px solid var(--color-border)}.study-table tr:last-child td{border-bottom:none}.study-footer{display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;margin-top:36px;padding-top:22px;border-top:1px solid var(--color-border);font-family:var(--font-body)}.section-nav{display:flex;justify-content:space-between;gap:12px;margin-top:40px;padding-top:20px;border-top:1px solid var(--color-border)}.section-nav-link{display:flex;flex-direction:column;gap:3px;max-width:46%;color:var(--color-text)}.section-nav-link:hover{text-decoration:none}.section-nav-link:hover .section-nav-title{color:var(--color-primary)}.section-nav-link--next{text-align:right;margin-left:auto}.section-nav-dir{font-size:12px;color:var(--color-text-muted);font-weight:600}.section-nav-title{font-size:14px;font-weight:550}.exercise-card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:22px}.exercise-title{margin:0 0 4px;font-size:18px}.setup-summary{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;background:var(--color-surface-2);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:13px 15px;margin:18px 0}.setup-label{display:block;font-size:11.5px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:var(--color-text-muted);margin-bottom:3px}.setup-value{margin:0;font-size:14px}.config-panel{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-bg-2);padding:4px 18px 18px;margin:18px 0}.config-section{padding-top:18px}.config-section+.config-section{border-top:1px solid var(--color-border);margin-top:18px}.config-heading{font-size:13px;text-transform:uppercase;letter-spacing:.05em;margin:0 0 10px}.config-intro{margin-bottom:14px}.preset-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:9px}.preset{text-align:left;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:11px 13px;display:flex;flex-direction:column;gap:3px;transition:border-color .15s ease,background-color .15s ease}.preset:hover{border-color:var(--color-primary)}.preset--active{border-color:var(--color-primary);background:var(--color-primary-soft)}.preset-name{font-weight:650;font-size:14px;color:var(--color-text)}.preset-description{font-size:12.5px;color:var(--color-text-muted);line-height:1.45}.field-table{display:grid;gap:2px}.field-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:9px 0;border-bottom:1px solid var(--color-border)}.field-row:last-child{border-bottom:none}.field-label{display:flex;flex-direction:column;gap:2px;min-width:0}.field-name{font-weight:600;font-size:14px}.segmented{display:inline-flex;border:1px solid var(--color-border-strong);border-radius:var(--radius-sm);overflow:hidden;background:var(--color-surface);flex-shrink:0}.segment{background:transparent;border:none;border-right:1px solid var(--color-border);padding:7px 13px;font-size:13px;font-weight:550;color:var(--color-text-muted);transition:background-color .12s ease,color .12s ease}.segment:last-child{border-right:none}.segment:hover:not(:disabled){background:var(--color-surface-2);color:var(--color-text)}.segment--on{background:var(--color-primary);color:#fff}.segment--on:hover:not(:disabled){background:var(--color-primary-hover);color:#fff}.segment:disabled{opacity:.35;cursor:not-allowed}.config-summary{margin:12px 0 0;font-size:13.5px;color:var(--color-text-muted);background:var(--color-surface);border:1px dashed var(--color-border-strong);border-radius:var(--radius-sm);padding:9px 12px}.toggle-row{display:flex;align-items:flex-start;gap:11px;padding:9px 0;font-size:14px;cursor:pointer}.toggle-row input{margin-top:2px;flex-shrink:0}.toggle-row span{display:flex;flex-direction:column;gap:2px}.toggle-row strong{font-weight:600}.toggle-row--disabled{opacity:.5;cursor:not-allowed}.slider-row{display:flex;flex-direction:column;gap:5px;padding:12px 0 4px}.slider-row label{font-size:14px;font-weight:600}.slider-value{color:var(--color-primary);font-weight:700;margin-left:4px}.drill{padding-top:12px}.drill-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}.drill-exit{background:transparent;border:none;color:var(--color-text-muted);font-size:13px;display:inline-flex;align-items:center;gap:6px;padding:4px 0}.drill-exit:hover{color:var(--color-text)}.drill-position{font-family:var(--font-mono);font-size:13px;color:var(--color-text-muted)}.drill-score{font-family:var(--font-mono);font-size:13px;display:inline-flex;gap:7px}.drill-correct{color:var(--color-accent);font-weight:700}.drill-incorrect{color:var(--color-danger);font-weight:700}.drill-sep{color:var(--color-text-muted);opacity:.5}.flashcard{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow-md);padding:40px 28px;margin:18px 0;min-height:260px;display:flex;flex-direction:column;justify-content:center;text-align:center}.flashcard--flipped{justify-content:flex-start;padding-top:34px}.flashcard-prompt{display:flex;flex-direction:column;align-items:center;gap:10px}.flashcard-divider{width:100%;border:none;border-top:1px solid var(--color-border);margin:24px 0 20px}.flashcard-answer{display:flex;flex-direction:column;align-items:center;gap:10px}.card-target{font-family:var(--font-read);font-size:34px;font-weight:600;margin:0;line-height:1.25;letter-spacing:-.01em}.card-target--han,.card-target--kana{font-size:52px;letter-spacing:.04em}.card-translit{font-size:19px;color:var(--color-text-muted);font-style:italic;margin:0}.card-translation{font-family:var(--font-read);font-size:22px;color:var(--color-text);margin:0;font-style:italic}.card-note{font-size:13.5px;color:var(--color-text-muted);margin:6px 0 0;max-width:44ch;line-height:1.55}.card-example{display:flex;flex-direction:column;gap:2px;margin-top:14px;padding:11px 16px;background:var(--color-surface-2);border-radius:var(--radius-sm);border:1px solid var(--color-border)}.card-example-target{font-family:var(--font-read);font-size:16px;font-weight:600}.card-example-translit{font-size:13px;color:var(--color-text-muted);font-style:italic}.card-example-translation{font-size:14px;color:var(--color-text-muted);font-style:italic}.audio-button{background:transparent;border:1px solid var(--color-border-strong);border-radius:999px;color:var(--color-primary);padding:7px;display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:background-color .15s ease,transform .06s ease}.audio-button:hover{background:var(--color-primary-soft)}.audio-button:active{transform:scale(.96)}.audio-button--large{width:auto;padding:22px 30px;flex-direction:column;gap:10px;border-width:2px}.audio-button-hint{font-size:12px;letter-spacing:.06em;text-transform:uppercase;font-weight:700;color:var(--color-text-muted)}.card-audio-missing{font-size:14px;color:var(--color-danger);max-width:42ch;margin:0}.flashcard-listen-hint{font-size:13px;color:var(--color-text-muted);margin:18px 0 0}.drill-actions{margin-top:6px}.drill-grade{display:grid;grid-template-columns:1fr 1fr;gap:10px}.grade-button{flex-direction:column;gap:5px}.drill-setup{text-align:center;margin-top:18px;font-size:12.5px}.summary{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);padding:30px 26px;text-align:center}.summary h1{font-size:24px;margin-bottom:4px}.summary-score{margin:22px 0 14px}.summary-value{display:block;font-size:46px;font-weight:700;color:var(--color-primary);line-height:1}.summary-label{display:block;font-size:13.5px;color:var(--color-text-muted);margin-top:6px}.summary-missed{margin-top:26px;text-align:left}.summary-missed h2{font-size:14px;text-transform:uppercase;letter-spacing:.05em;color:var(--color-text-muted);margin:0 0 8px}.summary-actions{display:flex;flex-direction:column;gap:9px;margin-top:26px}@media(max-width:620px){h1{font-size:23px}.page{margin-top:18px;padding-bottom:60px}.stat-row{grid-template-columns:repeat(2,1fr)}.tile{padding:15px;gap:12px}.tile-emblem{font-size:27px}.row{padding:13px;gap:12px}.row-chevron{display:none}.field-row{flex-direction:column;align-items:stretch;gap:9px}.segmented{width:100%}.segment{flex:1}.vocab-entry,.example-row,.vocab-entry:has(.vocab-translit),.example-row:has(.example-translit){grid-template-columns:minmax(0,1fr) auto;row-gap:1px}.vocab-translation,.example-translation{grid-column:1 / -1}.flashcard{padding:30px 20px;min-height:220px}.card-target{font-size:28px}.card-target--han,.card-target--kana{font-size:42px}.card-translation{font-size:19px}.study-footer{flex-direction:column;align-items:stretch}.section-nav-link{max-width:48%}}