:root{color-scheme:light dark;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f6f3ea;color:#17211d;--bg: #f6f3ea;--panel: #fffdf7;--panel-2: #edf4ef;--text: #17211d;--muted: #647069;--border: #d9dfd7;--primary: #146c53;--primary-strong: #0d4c3a;--accent: #b8472d;--gold: #c9982e;--shadow: 0 18px 40px rgba(23, 33, 29, .1)}@media(prefers-color-scheme:dark){:root{background:#111816;color:#eef4ee;--bg: #111816;--panel: #1b2521;--panel-2: #22312b;--text: #eef4ee;--muted: #a8b5ad;--border: #34433c;--primary: #47b889;--primary-strong: #6bd0a3;--accent: #f08b65;--gold: #e0b957;--shadow: 0 18px 40px rgba(0, 0, 0, .34)}}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:linear-gradient(135deg,rgba(20,108,83,.12),transparent 34%),linear-gradient(230deg,rgba(184,71,45,.1),transparent 35%),var(--bg)}button,input,textarea,select{font:inherit}button{border:0}.app-shell{min-height:100vh;padding-bottom:calc(84px + env(safe-area-inset-bottom))}.screen{width:min(1060px,100%);margin:0 auto;padding:18px}.home-screen{display:grid;gap:16px}.hero-panel,.form-panel,.lesson-header,.section,.voice-panel,.helper-panel,.grammar-card,.empty-state,.plain-header{background:color-mix(in srgb,var(--panel) 94%,transparent);border:1px solid var(--border);border-radius:8px;box-shadow:var(--shadow)}.hero-panel{min-height:430px;display:flex;flex-direction:column;justify-content:flex-end;padding:clamp(22px,5vw,48px);background:linear-gradient(180deg,#12372a0f,#12372a29),radial-gradient(circle at top right,rgba(201,152,46,.26),transparent 30%),var(--panel)}.eyebrow{margin:0 0 8px;color:var(--accent);font-size:.78rem;font-weight:800;letter-spacing:0;text-transform:uppercase}h1,h2,h3,p{overflow-wrap:anywhere}h1{margin:0;font-size:clamp(2rem,8vw,4.8rem);line-height:.98}h2{margin:0;font-size:1.35rem}h3{margin:14px 0 8px;font-size:1rem}.lede{max-width:650px;color:var(--muted);font-size:1.08rem;line-height:1.6}.hero-actions,.toolbar,.practice-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}.primary,.secondary,.ghost,.icon-button,.audio-chip{min-height:44px;display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:8px;cursor:pointer;transition:transform .15s ease,background .15s ease,border-color .15s ease}.primary{background:var(--primary);color:#fff;padding:0 18px;font-weight:800}.primary:hover,.secondary:hover,.ghost:hover,.icon-button:hover,.audio-chip:hover{transform:translateY(-1px)}.primary:disabled{opacity:.7;cursor:progress}.secondary,.ghost,.audio-chip{border:1px solid var(--border);background:var(--panel);color:var(--text);padding:0 15px;font-weight:750}.ghost{background:color-mix(in srgb,var(--panel) 70%,transparent)}.compact{min-height:40px;padding-inline:13px}.wide{width:100%}.icon-button{width:38px;min-height:38px;padding:0;margin-left:6px;border:1px solid var(--border);background:var(--panel-2);color:var(--primary-strong);vertical-align:middle}.danger{color:var(--accent)}.tts-note,.muted,.plain-header p,.saved-main span,.flashcard small{color:var(--muted)}.stats-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}.stats-grid div{min-width:0;padding:14px 10px;border-radius:8px;border:1px solid var(--border);background:var(--panel);text-align:center}.stats-grid strong{display:block;color:var(--primary-strong);font-size:1.45rem}.stats-grid span{display:block;color:var(--muted);font-size:.78rem}.form-panel{display:grid;gap:16px;padding:18px}label{display:grid;gap:8px;color:var(--text);font-weight:800}input,textarea,select{width:100%;border:1px solid var(--border);border-radius:8px;background:var(--panel);color:var(--text);padding:13px 14px;outline:none}textarea{resize:vertical;line-height:1.5}input:focus,textarea:focus,select:focus{border-color:var(--primary);box-shadow:0 0 0 3px color-mix(in srgb,var(--primary) 24%,transparent)}.field-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.alert,.notice,.global-notice{margin:0;border-radius:8px;padding:12px 14px}.alert{border:1px solid color-mix(in srgb,var(--accent) 40%,var(--border));background:color-mix(in srgb,var(--accent) 12%,var(--panel));color:var(--accent)}.notice,.global-notice{border:1px solid color-mix(in srgb,var(--gold) 52%,var(--border));background:color-mix(in srgb,var(--gold) 16%,var(--panel))}.global-notice{width:min(1060px,calc(100% - 36px));margin:14px auto 0}.toolbar{margin-bottom:12px}.sticky{position:sticky;top:8px;z-index:2;padding:8px;border-radius:8px;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);background:color-mix(in srgb,var(--bg) 80%,transparent)}.lesson-screen{display:grid;gap:14px}.lesson-header,.section,.voice-panel,.helper-panel,.plain-header,.empty-state{padding:18px}.lesson-header h1,.plain-header h1{font-size:clamp(1.8rem,7vw,3.3rem)}.lesson-header p{color:var(--muted);line-height:1.6}.section-title{display:flex;align-items:center;gap:8px;margin-bottom:14px}.table-wrap{overflow-x:auto;border-radius:8px;border:1px solid var(--border)}table{width:100%;border-collapse:collapse;min-width:760px}th,td{padding:12px;border-bottom:1px solid var(--border);text-align:left;vertical-align:top}th{color:var(--muted);background:var(--panel-2);font-size:.8rem}.spanish{color:var(--primary-strong);font-weight:850}.card-list{display:grid;gap:12px}.lesson-card,.saved-card,.quiz article,.review-card,.sentence,.dialogue-line,.tip-grid p,.qa-list p{border:1px solid var(--border);border-radius:8px;background:var(--panel)}.lesson-card{padding:16px}.version-grid,.tip-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.sentence-list,.dialogue,.quiz,.qa-list{display:grid;gap:10px}.sentence{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:12px}.sentence span,.dialogue-line span{display:block;color:var(--muted);margin-top:4px}.dialogue-line{display:flex;flex-direction:column;gap:10px;padding:12px}.dialogue-line strong{display:block;line-height:1.25}.dialogue-line p{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin:0;line-height:1.45}.notes{margin:12px 0 0;padding-left:20px;color:var(--muted);line-height:1.6}.tip-grid p,.qa-list p,.quiz article{margin:0;padding:12px;line-height:1.5}.chip-list{display:flex;flex-wrap:wrap;gap:8px}.audio-chip{min-height:38px}.quiz article p{margin:8px 0 0;color:var(--primary-strong)}.review-card{padding:16px;background:linear-gradient(135deg,color-mix(in srgb,var(--primary) 10%,transparent),transparent),var(--panel)}.review-card h3{margin-top:0}.must-say{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}.must-say span{padding:8px 10px;border-radius:8px;background:var(--panel-2);color:var(--primary-strong);font-weight:800}.saved-card{display:grid;grid-template-columns:1fr auto;align-items:center;gap:10px;padding:10px}.saved-main{min-height:54px;display:grid;gap:4px;border-radius:8px;background:transparent;color:var(--text);text-align:left;cursor:pointer}.empty-state{min-height:260px;display:grid;place-items:center;align-content:center;gap:12px;text-align:center}.practice-screen,.grammar-screen{display:grid;gap:14px}.voice-panel{display:grid;gap:12px}.voice-grid{align-items:end}.range-readout,.voice-test span{color:var(--muted);font-size:.88rem;font-weight:700}.voice-test{display:grid;gap:8px}.helper-panel{display:grid;gap:12px}.helper-input{display:grid;grid-template-columns:1fr auto;gap:10px}.helper-answer,.formula-box,.comparison-box,.practice-check,.example-line{border:1px solid var(--border);border-radius:8px;background:var(--panel)}.helper-answer{padding:14px;line-height:1.55}.helper-answer p{margin:0 0 10px}.pattern-tabs{display:flex;gap:8px;overflow-x:auto;padding:2px 0 8px}.pattern-tabs button{min-height:40px;flex:0 0 auto;border:1px solid var(--border);border-radius:8px;background:var(--panel);color:var(--text);padding:0 12px;font-weight:800;cursor:pointer}.pattern-tabs button.active{border-color:color-mix(in srgb,var(--primary) 50%,var(--border));background:var(--panel-2);color:var(--primary-strong)}.grammar-card{display:grid;gap:14px;padding:18px;box-shadow:var(--shadow)}.grammar-card-header{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}.grammar-card-header h3{margin:0;font-size:clamp(1.35rem,5vw,2.1rem)}.formula-box,.comparison-box{display:grid;gap:6px;padding:13px;background:var(--panel-2)}.formula-box span{color:var(--primary-strong);font-weight:850}.formula-box small,.example-line small{color:var(--muted)}.example-columns{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.ai-example-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin:12px 0}.example-columns h4,.grammar-practice h4{margin:0 0 8px}.example-line{padding:12px;margin-bottom:8px}.example-line p{margin:0 0 8px}.grammar-practice{display:grid;gap:10px}.practice-check{display:grid;gap:10px;padding:12px}.practice-check.correct{border-color:color-mix(in srgb,var(--primary) 60%,var(--border))}.practice-check.needs-work{border-color:color-mix(in srgb,var(--gold) 70%,var(--border))}.practice-check p{margin:0;line-height:1.5}.practice-check p span{display:block;color:var(--muted);margin-top:4px}.practice-row{display:flex;align-items:center;gap:8px}.guardrail-note{color:var(--muted);font-size:.9rem;border-top:1px solid var(--border);padding-top:10px}.flashcard{width:100%;min-height:290px;display:grid;place-items:center;gap:12px;padding:24px;border:1px solid var(--border);border-radius:8px;background:linear-gradient(135deg,color-mix(in srgb,var(--gold) 16%,transparent),transparent),var(--panel);color:var(--text);box-shadow:var(--shadow);cursor:pointer}.flashcard span{color:var(--accent);font-weight:800}.flashcard strong{font-size:clamp(1.6rem,8vw,3rem);text-align:center}.bottom-nav{position:fixed;left:50%;bottom:max(10px,env(safe-area-inset-bottom));transform:translate(-50%);z-index:20;width:min(680px,calc(100% - 20px));display:grid;grid-template-columns:repeat(6,1fr);gap:4px;padding:6px;border:1px solid var(--border);border-radius:8px;background:color-mix(in srgb,var(--panel) 92%,transparent);box-shadow:var(--shadow);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.bottom-nav button{min-width:0;min-height:48px;display:grid;place-items:center;gap:2px;border-radius:8px;background:transparent;color:var(--muted);font-size:.76rem;font-weight:800;cursor:pointer}.bottom-nav button.active{background:var(--panel-2);color:var(--primary-strong)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(max-width:760px){.screen{padding:12px}.hero-panel{min-height:520px;padding:22px}.hero-actions .primary,.hero-actions .secondary,.practice-actions .primary,.practice-actions .secondary{width:100%}.stats-grid{grid-template-columns:repeat(2,1fr)}.stats-grid div:last-child{grid-column:1 / -1}.field-grid,.version-grid,.tip-grid,.example-columns,.ai-example-grid,.helper-input{grid-template-columns:1fr}.sentence{align-items:flex-start}.bottom-nav{width:calc(100% - 14px)}}.course-screen{display:grid;gap:14px;align-content:start}.course-stack{display:grid;grid-template-columns:minmax(0,1fr);gap:14px}.course-stack .table-wrap{overflow-x:auto;max-width:100%}.course-top{display:grid;gap:8px}.course-top .pattern-tabs button,.course-context button{min-height:44px}.course-context{display:flex;gap:6px;flex-wrap:wrap}.course-context button{flex:1 1 0;border:1px solid var(--border);border-radius:8px;background:var(--panel);color:var(--text);font-weight:800;cursor:pointer;padding:0 12px}.course-context button.active{background:var(--primary);border-color:var(--primary);color:#fff}.course-stats{grid-template-columns:repeat(3,1fr)}.course-stats div:last-child{grid-column:auto}.course-alert strong{display:block;margin-bottom:4px}.course-plan,.course-list{list-style:none;margin:0;padding:0;display:grid;gap:8px}.course-block,.course-row{width:100%;min-height:56px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid var(--border);border-radius:8px;background:var(--panel);color:var(--text);text-align:left;cursor:pointer}.course-block-min{min-width:44px;text-align:center;padding:6px 4px;border-radius:8px;background:var(--panel-2);color:var(--primary-strong);font-weight:800}.course-block-main,.course-row-main{flex:1;min-width:0;display:grid;gap:2px}.course-block-main small,.course-row-main small{color:var(--muted)}.course-row:disabled{opacity:.6;cursor:not-allowed}.course-badge{flex:none;padding:3px 8px;border-radius:999px;border:1px solid var(--border);background:var(--panel-2);color:var(--muted);font-size:.74rem;font-weight:800}.course-badge.hot{border-color:var(--gold);color:var(--gold)}.course-badge.st-completed{background:var(--primary);border-color:var(--primary);color:#fff}.course-badge.st-in_progress{color:var(--gold);border-color:var(--gold)}.course-levels{display:grid;gap:12px}.course-level-head{display:flex;justify-content:space-between;gap:8px;font-size:.88rem;margin-bottom:4px}.course-level-head span{color:var(--muted)}.course-bar{height:10px;border-radius:999px;background:var(--panel-2);border:1px solid var(--border);overflow:hidden}.course-bar span{display:block;height:100%;background:var(--primary)}.course-actions{display:flex;gap:8px;flex-wrap:wrap}.course-actions>*{flex:1 1 140px}.course-card{display:grid;gap:12px;padding:16px;border:1px solid var(--border);border-radius:8px;background:var(--panel)}.course-prompt{font-size:1.25rem;font-weight:800;line-height:1.4;margin:0}.course-form{display:grid;gap:8px}.course-form input,.course-form select{min-height:44px}.course-choices{display:grid;gap:8px}.course-choice{width:100%;justify-content:flex-start;text-align:left;min-height:48px;height:auto;padding-block:8px}.course-choice.right{border-color:var(--primary);background:var(--panel-2)}.course-choice.wrong{border-color:var(--accent)}.course-wrong{color:var(--accent)}.course-accent{color:var(--gold);font-weight:800}.course-trap{color:var(--accent)}.course-runner-head{display:flex;align-items:center;justify-content:space-between;gap:8px}.course-summary{text-align:center;display:grid;gap:10px;justify-items:center}.course-summary .notes{text-align:left}.course-score{font-size:3rem;font-weight:900;color:var(--primary-strong);margin:0}.course-chat{display:grid;gap:10px}.course-bubble{max-width:92%;padding:10px 12px;border-radius:12px;border:1px solid var(--border);background:var(--panel)}.course-bubble p{margin:4px 0}.course-bubble small{color:var(--muted);font-weight:800}.course-bubble.me{justify-self:end;background:var(--panel-2)}.course-compose{padding:12px;border:1px solid var(--border);border-radius:8px;background:var(--panel)}.course-vocab{display:grid;gap:4px;padding:12px;border:1px solid var(--border);border-radius:8px;background:var(--panel)}.course-vocab p{margin:0}.course-vocab-head{display:flex;justify-content:space-between;align-items:center;gap:8px}.bottom-nav button{font-size:.7rem;padding-inline:0}.ask-box{display:grid;gap:10px;min-width:0}.ask-similar,.chip-row{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.chip{border:1px solid var(--border);border-radius:999px;background:var(--panel-2);color:var(--text);padding:6px 12px;min-height:36px;font:inherit;font-size:.88rem;cursor:pointer;text-align:left;max-width:100%}.chip.active{background:var(--primary);border-color:var(--primary);color:#fff}.saved-badge{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px;margin:0;padding:8px 12px;border:1px solid color-mix(in srgb,var(--primary) 40%,var(--border));border-radius:8px;background:color-mix(in srgb,var(--primary) 10%,var(--panel));color:var(--text)}.saved-badge button{min-height:36px;display:inline-flex;gap:4px;align-items:center}.tag-form{display:flex;gap:6px;flex:1 1 160px}.tag-form input{min-height:36px;padding:6px 10px}.saved-raw{width:100%;max-width:100%;overflow:auto;font-size:.8rem;white-space:pre-wrap;word-break:break-word}.check-row{display:flex;align-items:center;gap:10px}.check-row input{width:22px;height:22px;flex:none}.chat-objectives{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:6px}.chat-objectives li{border:1px solid var(--border);border-radius:999px;padding:4px 10px;font-size:.82rem;background:var(--panel);color:var(--muted);max-width:100%}.chat-objectives li.met{border-color:var(--primary);background:color-mix(in srgb,var(--primary) 14%,var(--panel));color:var(--primary-strong);font-weight:700}.chat-bubble-actions{display:flex;flex-wrap:wrap;gap:6px}.chat-bubble-actions .ghost{min-height:36px}.course-bubble .ask-box{margin-top:8px}.ai-sheet{position:fixed;inset:0;z-index:50;display:flex;align-items:flex-end;justify-content:center;background:#00000073}.ai-sheet-body{width:100%;max-width:560px;max-height:88vh;overflow-y:auto;display:grid;gap:12px;padding:18px 16px calc(18px + env(safe-area-inset-bottom));background:var(--panel);border-radius:16px 16px 0 0;border:1px solid var(--border);box-sizing:border-box}.ai-sheet-body h2{margin:0}.summary-errors{display:grid;gap:8px;text-align:left;width:100%}