:root{color-scheme:light;--bg: #f4f5f1;--panel: #ffffff;--ink: #202629;--muted: #687176;--line: #d8ded9;--accent: #14735f;--accent-dark: #0f5447;--danger: #b33327;--soft: #e8f2ee;--gold: #c99332;--surface: #fafbf8;--sidebar: #edf1ed;--input-bg: #ffffff;--segment-bg: #edf1ed;--control-bg: #ffffff;--button-muted-bg: #f7f8f5;--error-bg: #fff0ed;--error-line: #f0c3bb;--answer-focus-bg: #fff8e8;--shadow: rgba(24, 37, 34, .12)}:root[data-theme=dark]{color-scheme:dark;--bg: #111614;--panel: #181f1c;--ink: #eef3ef;--muted: #9aa8a1;--line: #2d3934;--accent: #44b79b;--accent-dark: #2f9a82;--danger: #f07868;--soft: #20342e;--gold: #d5a84b;--surface: #141b18;--sidebar: #151c19;--input-bg: #101613;--segment-bg: #111815;--control-bg: #18211d;--button-muted-bg: #151d19;--error-bg: #321d1a;--error-line: #6e332b;--answer-focus-bg: #2a2414;--shadow: rgba(0, 0, 0, .28)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}.loading-screen{min-height:100vh;display:grid;place-items:center;color:var(--muted)}.auth-page{min-height:100vh;display:grid;grid-template-columns:minmax(360px,.9fr) minmax(420px,1.1fr)}.auth-brand{padding:clamp(32px,7vw,84px);background:#182522;color:#fff;display:flex;flex-direction:column;justify-content:space-between;gap:48px}.brand-lockup{display:grid;gap:20px;max-width:520px}.mark{width:58px;height:58px;display:grid;place-items:center;border-radius:14px;background:var(--accent);color:#fff;font-size:30px;font-weight:800}.mark.small{width:42px;height:42px;border-radius:10px;font-size:22px}.auth-brand h1{margin:0;font-size:clamp(44px,7vw,76px);line-height:.95}.auth-brand p{margin:12px 0 0;color:#c9d3cf;font-size:19px;line-height:1.5}.brand-metrics{display:grid;gap:10px;color:#dfe8e4}.brand-metrics span{padding-top:12px;border-top:1px solid rgba(255,255,255,.18)}.auth-card{align-self:center;justify-self:center;width:min(460px,calc(100% - 36px));background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:30px}.auth-heading{display:grid;gap:8px}.eyebrow{margin:0;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:0}.auth-heading h2,.page-header h1{margin:0;font-size:30px;line-height:1.15}.page-subtitle{margin:8px 0 0;color:var(--muted);line-height:1.45}.auth-heading p:not(.eyebrow){margin:0;color:var(--muted)}.auth-tabs,.segmented{margin:24px 0;padding:4px;background:var(--segment-bg);border:1px solid var(--line);border-radius:8px;display:grid;grid-template-columns:1fr 1fr;gap:4px}.auth-tabs a,.segmented button{min-height:40px;border:0;border-radius:6px;color:var(--muted);background:transparent;text-decoration:none;display:grid;place-items:center}.auth-tabs a.active,.segmented button.active{background:var(--panel);color:var(--ink);box-shadow:0 1px 5px var(--shadow)}.form-stack,.settings-panel{display:grid;gap:16px}.form-stack label,.field-label{display:grid;gap:8px;color:var(--muted);font-size:14px}input,select{min-height:46px;width:100%;border:1px solid var(--line);border-radius:7px;padding:0 12px;background:var(--input-bg);color:var(--ink)}select[multiple]{min-height:150px;padding:8px}input:focus,select:focus{border-color:var(--accent);outline:3px solid rgba(20,115,95,.14)}.password-field{display:grid;grid-template-columns:1fr auto}.password-field input{border-radius:7px 0 0 7px}.password-field button{min-width:72px;border:1px solid var(--line);border-left:0;border-radius:0 7px 7px 0;background:var(--button-muted-bg);color:var(--muted)}.primary-action,.secondary-action,.quiet-action,.quiet-button,.utility-group button,.grade-group button,.context-toggle{min-height:42px;border:1px solid var(--line);border-radius:7px;padding:0 14px;background:var(--control-bg);color:var(--ink)}.primary-action{background:var(--accent);color:#fff;border-color:var(--accent);font-weight:700}.primary-action:hover{background:var(--accent-dark)}.secondary-action{background:var(--ink);color:var(--bg);border-color:var(--ink)}.quiet-action{background:transparent;color:var(--muted)}.form-error{color:var(--danger);background:var(--error-bg);border:1px solid var(--error-line);border-radius:7px;padding:11px 12px}.field-error{margin:0;color:var(--danger);font-size:13px}.app-shell{min-height:100vh;display:grid;grid-template-columns:270px minmax(0,1fr)}.sidebar{padding:24px 18px;background:var(--sidebar);border-right:1px solid var(--line);display:flex;flex-direction:column;gap:24px}.sidebar-brand{display:flex;align-items:center;gap:12px}.sidebar-brand div{display:grid;gap:2px;min-width:0}.sidebar-brand strong{font-size:20px}.sidebar-brand span:not(.mark){color:var(--muted);overflow:hidden;text-overflow:ellipsis}.side-nav{display:grid;gap:8px}.side-nav a{min-height:42px;border-radius:7px;padding:0 12px;color:var(--ink);text-decoration:none;display:flex;align-items:center}.side-nav a.active{background:var(--ink);color:var(--bg)}.quiet-button{margin-top:auto}.theme-toggle{min-height:42px;border:1px solid var(--line);border-radius:7px;padding:0 10px 0 12px;background:transparent;color:var(--ink);display:flex;align-items:center;justify-content:space-between;gap:12px}.theme-toggle span:first-child{color:var(--muted)}.switch{width:38px;height:22px;padding:2px;border-radius:999px;background:var(--line);display:block}.switch i{width:18px;height:18px;border-radius:999px;background:var(--panel);display:block;transition:transform .12s ease}.theme-toggle[aria-pressed=true] .switch{background:var(--accent)}.theme-toggle[aria-pressed=true] .switch i{transform:translate(16px)}.workspace{padding:30px;min-width:0;max-width:1180px}.page-header{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px}.session-controls,.content-panel,.study-card,.related-list,.settings-panel,.metric,.heatmap,.review-callout,.study-start-panel,.progress-panel,.data-panel,.stats-toolbar,.session-complete{background:var(--panel);border:1px solid var(--line);border-radius:8px}.session-controls{padding:16px;margin-bottom:18px;display:grid;gap:12px}.session-controls .segmented{margin:0;max-width:420px}.domain-select{max-width:720px}.mode-note{margin:0;color:var(--muted);line-height:1.45}.session-config-footer{display:flex;align-items:center;justify-content:space-between;gap:14px}.study-card{padding:clamp(24px,5vw,56px)}.item-meta{color:var(--muted);font-size:13px;margin-bottom:24px}.sentence{min-height:136px;font-size:clamp(34px,5.5vw,66px);line-height:1.65;word-break:keep-all}.answer{font-size:inherit;line-height:inherit}.answer.correct{color:var(--accent)}.answer.incorrect{color:var(--danger)}ruby{ruby-position:over;ruby-align:center;font-size:1em}rt{color:var(--muted);font-size:14px;font-weight:500;line-height:1}.answer rt{color:currentColor;opacity:.72}.translation{margin:8px 0 0;color:var(--muted);font-size:19px}.sentence-form{margin-top:0;display:grid;gap:18px}.inline-cloze-shell{display:inline-block;position:relative;min-height:1.25em;height:1.25em;margin:0 .08em;border-bottom:4px solid var(--accent);background:transparent;vertical-align:baseline}.inline-cloze-input,.inline-cloze-feedback{position:absolute;inset:0;padding:0 .08em;font:inherit;line-height:1;text-align:center;letter-spacing:0;white-space:nowrap}.inline-cloze-input{min-height:1.25em;width:100%;border:0;border-radius:0;background:transparent;color:transparent;caret-color:var(--ink)}.inline-cloze-feedback{pointer-events:none;overflow:hidden}.char-match{color:var(--accent)}.char-miss{color:var(--danger)}.char-placeholder{color:var(--ink)}.inline-cloze-input:focus{outline:0}.inline-cloze-shell:focus-within{border-color:var(--gold);background:var(--answer-focus-bg)}.choice-panel{margin-top:12px;padding-top:14px;border-top:1px solid var(--line);display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}.choice-panel button{min-height:46px;border:1px solid var(--line);border-radius:7px;background:var(--surface);color:var(--ink);font-size:20px}.session-complete{padding:clamp(22px,4vw,34px);display:grid;gap:20px}.session-complete h2{margin:0;font-size:28px}.session-complete p:not(.eyebrow){margin:8px 0 0;color:var(--muted)}.completion-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.completion-actions{display:flex;gap:10px;flex-wrap:wrap}.submit-inline{display:none}.answer-fields{display:grid;gap:10px}.study-control-bar{margin-top:28px;padding-top:18px;border-top:1px solid var(--line);display:grid;grid-template-columns:minmax(0,1fr) auto;gap:14px;align-items:center}.study-control-bar.review{grid-template-columns:minmax(180px,.75fr) minmax(0,1fr) auto}.review-status{margin:0;font-weight:800}.review-status.correct{color:var(--accent)}.review-status.incorrect{color:var(--danger)}.utility-group,.grade-group{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.utility-group button,.grade-group button{background:var(--control-bg)}.grade-group{justify-content:flex-end}.grade-group button{min-width:92px}.audio-message{margin:10px 0 0;color:var(--muted);font-size:14px}.related-list{margin-top:10px;padding:0;display:grid;gap:12px;background:transparent;border:0}.context-toggle{justify-self:start;background:transparent;color:var(--muted)}.related-list article{border-top:1px solid var(--line);padding-top:12px}.related-list p{margin:6px 0}.related-list span{color:var(--muted)}.metric-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.dashboard-metrics{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px}.dashboard-hero{display:grid;grid-template-columns:minmax(260px,.44fr) minmax(0,1fr);gap:14px;align-items:stretch;margin-bottom:14px}.review-callout{padding:22px;display:grid;align-content:start;gap:8px;background:#182522;color:#fff}.review-callout .eyebrow{color:#c8d3cf}.review-callout strong{font-size:clamp(54px,8vw,92px);line-height:.9}.review-callout span{color:#dfe8e4}.review-callout button{margin-top:16px;width:100%;background:#fff;border-color:#fff;color:#182522}.review-scope{margin-top:6px;padding-top:14px;border-top:1px solid rgba(255,255,255,.16);display:grid;gap:10px}.review-scope label{display:grid;gap:6px;color:#c8d3cf;font-size:13px}.review-scope .check-row{display:flex;color:#dfe8e4}.review-scope .check-row input{width:auto;min-height:auto}.review-scope select{min-height:40px;border-color:#fff3;background:#23332f;color:#fff}.study-start-panel h2,.data-panel h2{margin:0;font-size:20px}.study-start-panel{padding:22px;display:grid;grid-template-columns:1fr auto;gap:18px 22px;align-items:end}.panel-heading{align-self:start}.study-start-controls{grid-column:1 / -1;display:grid;grid-template-columns:minmax(160px,.8fr) minmax(220px,1fr) 96px;gap:10px}.study-start-controls label,.stats-toolbar label{display:grid;gap:6px;color:var(--muted);font-size:13px}.study-start-controls label:first-child:last-child,.study-start-controls label:first-child:nth-last-child(2){grid-column:auto}.study-start-controls .domain-picker{grid-column:auto}.study-start-options{grid-column:1 / -1;display:flex;align-items:center}.study-start-options .check-row{display:flex;color:var(--muted);font-size:13px}.study-start-options .check-row input{width:auto;min-height:auto}.study-start-panel>.secondary-action{grid-column:2;grid-row:1;min-width:140px}.progress-panel{margin-bottom:14px;padding:16px 18px;display:grid;grid-template-columns:minmax(210px,auto) minmax(160px,1fr) auto;gap:16px;align-items:center}.progress-copy strong{display:block;margin-top:4px}.progress-track,.mini-track{height:10px;background:var(--segment-bg);border-radius:999px;overflow:hidden}.progress-track i,.mini-track i{display:block;height:100%;background:var(--accent)}.analytics-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.data-panel{padding:16px;min-width:0}.data-panel.wide{grid-column:1 / -1}.stats-toolbar{margin-bottom:14px;padding:14px;display:grid;grid-template-columns:minmax(220px,1fr) 220px;gap:12px;background:var(--surface)}.data-panel-header{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.data-panel-header select{width:auto;min-width:120px}.table-filter{min-height:38px;margin-bottom:10px}table{width:100%;border-collapse:collapse;font-size:14px}th,td{padding:8px 6px;border-bottom:1px solid var(--line);text-align:right;vertical-align:top}th:first-child,td:first-child{text-align:left}th{color:var(--muted);font-weight:600}.metric{padding:14px;background:var(--surface)}.metric span{color:var(--muted);font-size:13px}.metric strong{display:block;margin-top:6px;font-size:22px;line-height:1.35}.percent-cell{display:grid;grid-template-columns:minmax(74px,1fr) 44px;gap:8px;align-items:center}.percent-cell span{font-variant-numeric:tabular-nums}.mini-track{height:8px}.heatmap{margin-top:18px;padding:12px;display:grid;gap:8px}.domain-row{display:grid;grid-template-columns:minmax(180px,1fr) minmax(160px,3fr) 70px;gap:10px;align-items:center}.bar{height:12px;background:var(--soft);border-radius:999px;overflow:hidden}.bar i{display:block;height:100%;background:var(--accent)}.settings-panel{padding:18px;grid-template-columns:repeat(2,minmax(0,1fr))}.field-label.wide{grid-column:1 / -1}.check-row{display:flex;align-items:center;gap:10px}.check-row input{width:auto;min-height:auto}@media(max-width:860px){.auth-page,.app-shell,.metric-grid,.dashboard-metrics,.dashboard-hero,.analytics-grid,.progress-panel,.stats-toolbar,.completion-stats,.settings-panel{grid-template-columns:1fr}.auth-brand{padding:28px}.brand-metrics{display:none}.sidebar{border-right:0;border-bottom:1px solid var(--line)}.workspace{padding:18px}.page-header,.sentence-form{display:grid;grid-template-columns:1fr}.study-control-bar,.study-control-bar.review,.session-config-footer,.study-start-panel{grid-template-columns:1fr;display:grid}.study-start-panel>.secondary-action{grid-column:auto;grid-row:auto}.study-start-controls{grid-template-columns:1fr}.choice-panel{grid-template-columns:1fr 1fr}.grade-group{justify-content:flex-start}.domain-row{grid-template-columns:1fr}}