:root{--color-bg: #f8fafc;--color-surface: #ffffff;--color-primary: #0f766e;--color-primary-dark: #115e59;--color-text: #0f172a;--color-text-muted: #475569;--color-border: #e2e8f0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--color-text);background:var(--color-bg)}*{box-sizing:border-box}body{margin:0;min-height:100vh}.app{max-width:640px;margin:0 auto;padding:24px 16px 48px}h1{font-size:1.9rem;margin-bottom:.25rem}.subtitle{color:var(--color-text-muted);font-size:1.1rem;margin-top:0}.card{background:var(--color-surface);border:1px solid var(--color-border);border-radius:16px;padding:20px;margin-top:24px;box-shadow:0 1px 3px #0f172a14}.card h2{margin-top:0}ul{padding-left:1.2rem;line-height:1.8}.onboarding{max-width:560px;margin:0 auto;padding:32px 16px 64px}.step-card{display:flex;flex-direction:column;gap:14px}.big-text{font-size:1.15rem;line-height:1.5;margin:0}.btn{display:block;width:100%;border:none;border-radius:14px;padding:14px 18px;font-size:1.1rem;font-weight:600;cursor:pointer;text-align:center}.btn:disabled{opacity:.6;cursor:wait}.btn-big{padding:18px 20px;font-size:1.2rem;min-height:60px}.btn-primary{background:var(--color-primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--color-primary-dark)}.btn-secondary{background:#fff;color:var(--color-primary-dark);border:2px solid var(--color-primary)}.btn-ghost{background:transparent;color:var(--color-text-muted);text-decoration:underline;font-weight:400}.error{color:#b91c1c;font-size:1.05rem;margin:0}.field-label{font-size:1.05rem;font-weight:600}.text-input{width:100%;padding:14px;font-size:1.15rem;border:2px solid var(--color-border);border-radius:12px}.text-input:focus{outline:3px solid var(--color-primary);border-color:var(--color-primary)}.level-fieldset{border:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}.level-option{display:flex;align-items:center;gap:14px;padding:16px;border:2px solid var(--color-border);border-radius:14px;cursor:pointer;background:#fff}.level-option.selected{border-color:var(--color-primary);background:#f0fdfa}.level-option input{width:22px;height:22px;accent-color:var(--color-primary);flex-shrink:0}.level-option span{display:flex;flex-direction:column;gap:4px}.level-option strong{font-size:1.15rem}.level-option small{font-size:1rem;color:var(--color-text-muted)}.avatar-preview{width:220px;height:220px;border-radius:50%;border:4px solid var(--color-primary);align-self:center}.home-header{display:flex;align-items:center;gap:16px;margin-bottom:8px}.home-header h1{margin:0}.avatar-small{width:72px;height:72px;border-radius:50%;border:3px solid var(--color-primary);object-fit:cover;flex-shrink:0}.avatar-placeholder{display:grid;place-items:center;font-size:2rem;background:#f0fdfa}.muted{color:var(--color-text-muted)}.progress-track{width:100%;height:14px;background:var(--color-border);border-radius:999px;overflow:hidden}.progress-fill{height:100%;background:var(--color-primary);border-radius:999px;transition:width .3s ease}.trail{list-style:none;margin:24px 0 0;padding:0;position:relative}.trail-item{display:flex;gap:16px;align-items:stretch;position:relative;padding-bottom:22px}.trail-item:not(:last-child):before{content:"";position:absolute;left:31px;top:68px;bottom:0;width:4px;background:var(--color-border);border-radius:2px}.trail-item.completed:not(:last-child):before{background:var(--color-primary)}.trail-node{width:64px;height:64px;border-radius:50%;display:grid;place-items:center;font-size:1.8rem;background:#fff;border:4px solid var(--color-border);flex-shrink:0;z-index:1}.trail-item.available .trail-node{border-color:var(--color-primary);background:#f0fdfa}.trail-item.completed .trail-node{border-color:var(--color-primary);background:var(--color-primary)}.trail-item.locked .trail-node{background:#f1f5f9}.trail-card{flex:1;text-align:left;background:#fff;border:2px solid var(--color-border);border-radius:16px;padding:14px 16px;display:flex;flex-direction:column;gap:6px;cursor:pointer;font:inherit;color:inherit}.trail-card:disabled{cursor:not-allowed;opacity:.65;background:#f8fafc}.trail-item.available .trail-card{border-color:var(--color-primary)}.trail-item.completed .trail-card{border-color:var(--color-primary);background:#f0fdfa}.trail-title{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:1.1rem}.trail-subtitle{color:var(--color-text-muted);font-size:1rem}.trail-req{font-size:.95rem;color:var(--color-text-muted)}.trail-progress{font-size:1rem;color:var(--color-primary-dark)}.badge-done,.badge-hard,.badge-master{font-size:.85rem;font-weight:700;border-radius:999px;padding:3px 10px}.badge-done{background:#dcfce7;color:#166534}.badge-hard{background:#fef3c7;color:#92400e}.badge-master{background:#f0fdfa;color:var(--color-primary-dark)}.review-banner{border-color:var(--color-primary);background:#f0fdfa}.sheet-overlay{position:fixed;inset:0;background:#0f172a8c;display:grid;place-items:end center;z-index:50}.sheet{background:#fff;width:100%;max-width:640px;max-height:88vh;overflow-y:auto;border-radius:24px 24px 0 0;padding:24px 20px 40px;display:flex;flex-direction:column;gap:18px}@media(min-width:700px){.sheet-overlay{place-items:center}.sheet{border-radius:24px}}.sheet-header{display:flex;gap:14px;align-items:center}.sheet-icon{font-size:2.4rem}.sheet-header>div{flex:1}.sheet-title{margin:0}.sheet-close{border:none;background:#f1f5f9;width:44px;height:44px;border-radius:50%;font-size:1.1rem;cursor:pointer;flex-shrink:0}.sheet-intro{background:#f8fafc;border-radius:14px;padding:14px 16px}.level-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}.level-item{display:flex;align-items:center;gap:12px;border:2px solid var(--color-border);border-radius:16px;padding:14px;background:#fff}.level-info{flex:1;display:flex;flex-direction:column;gap:4px;font-size:1.05rem}.level-info small{font-size:.95rem}.level-item .btn{width:auto;min-width:120px;min-height:52px}.toast{position:fixed;left:50%;bottom:24px;transform:translate(-50%);background:var(--color-text);color:#fff;padding:14px 20px;border-radius:14px;font-size:1.05rem;max-width:90vw;z-index:60;cursor:pointer;box-shadow:0 8px 24px #0f172a40}.lesson{max-width:640px;margin:0 auto;padding:16px 16px 48px}.lesson-header{display:flex;align-items:center;gap:12px;margin-bottom:16px}.lesson-header-text{flex:1;min-width:0}.lesson-header-text h1{font-size:1.25rem;margin:0}.lesson-header-text .subtitle{font-size:1rem;margin:0}.lesson-timer{font-size:1.2rem;font-weight:700;color:var(--color-primary-dark);background:#f0fdfa;padding:8px 12px;border-radius:12px;white-space:nowrap}.lesson-card{background:#fff;border:1px solid var(--color-border);border-radius:20px;padding:20px;display:flex;flex-direction:column;gap:14px;box-shadow:0 1px 3px #0f172a14}.lesson-scene{margin:0;font-size:1rem}.lesson-en{font-size:1.6rem;font-weight:700;line-height:1.3;margin:0}.lesson-phonetic{color:var(--color-primary-dark);font-size:1.15rem;margin:0}.lesson-pt{font-size:1.25rem;margin:0}.lesson-big-pt{font-size:1.1rem;color:var(--color-text-muted);margin:0}.lesson-tip{background:#fffbeb;border-radius:12px;padding:12px 14px;font-size:1.05rem;margin:0}.option-list{display:flex;flex-direction:column;gap:10px}.option-btn{text-align:left;font:inherit;font-size:1.15rem;padding:16px;min-height:56px;border-radius:14px;border:2px solid var(--color-border);background:#fff;cursor:pointer}.option-btn:disabled{cursor:default}.option-btn.correct{border-color:#16a34a;background:#dcfce7}.option-btn.wrong{border-color:#dc2626;background:#fee2e2}.feedback-good{color:#166534;font-size:1.15rem;font-weight:700;margin:0}.feedback-bad{color:#991b1b;font-size:1.15rem;font-weight:700;margin:0}.speech-result{background:#f0fdfa;border-radius:14px;padding:14px;display:flex;flex-direction:column;gap:10px}.speech-score{font-size:1.4rem;font-weight:800;color:var(--color-primary-dark);margin:0}.self-assess{display:flex;flex-direction:column;gap:10px;background:#f8fafc;padding:14px;border-radius:14px}.summary-card{align-items:center;text-align:center}.summary-title{font-size:1.8rem;margin:0}.install-banner{border-color:var(--color-primary);background:#fffbeb;display:flex;flex-direction:column;gap:12px}.review-banner .btn{margin-top:8px}.chat-banner{border-color:var(--color-primary);display:flex;flex-direction:column;gap:12px}.chat-messages{display:flex;flex-direction:column;gap:12px;margin-bottom:16px;max-height:60vh;overflow-y:auto;padding:4px}.chat-bubble{max-width:88%;border-radius:18px;padding:12px 16px;display:flex;flex-direction:column;gap:6px}.chat-ai{align-self:flex-start;background:#f0fdfa;border:2px solid var(--color-primary);border-bottom-left-radius:6px}.chat-user{align-self:flex-end;background:var(--color-primary);color:#fff;border-bottom-right-radius:6px}.chat-en{font-size:1.2rem;font-weight:600;margin:0}.chat-pt{margin:0;color:var(--color-text-muted);font-size:1.05rem}.chat-tip{margin:0;background:#fffbeb;border-radius:10px;padding:8px 10px;font-size:1rem}.chat-repeat{width:auto;align-self:flex-start;padding:4px 0;min-height:auto;font-size:.95rem;color:var(--color-primary-dark)}.chat-typing{align-self:flex-start}.chat-input-row{display:flex;gap:8px;align-items:center;position:sticky;bottom:0;background:var(--color-bg);padding-top:8px}.chat-mic,.chat-send{width:auto;min-width:56px;min-height:56px;padding:0;font-size:1.3rem;flex-shrink:0}.chat-text{flex:1}.pron-guide,.guide-toggle{width:100%}.phonetic-guide{margin-top:10px;padding:14px;background:color-mix(in srgb,var(--color-primary) 6%,var(--color-surface));border:1px solid var(--color-border);border-radius:12px;text-align:left}.guide-legend{font-size:.85rem;color:var(--color-text-muted);margin-bottom:8px}.guide-word{padding:10px 0;border-top:1px dashed var(--color-border)}.guide-word:first-of-type{border-top:none;padding-top:4px}.guide-word-en{font-weight:700;color:var(--color-primary-dark);margin-bottom:6px}.guide-word-note{font-size:.9rem;color:var(--color-text);background:var(--color-surface);border:1px solid var(--color-border);border-radius:8px;padding:6px 10px;margin-bottom:6px}.guide-syllables{display:flex;flex-wrap:wrap;gap:6px}.guide-syl{display:flex;flex-direction:column;align-items:center;gap:3px;max-width:190px;padding:5px 9px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:10px;text-align:center}.guide-syl .syl{font-weight:700;font-size:.95rem;color:var(--color-text);padding:0 5px;border-radius:5px}.guide-syl.stressed{border-color:var(--color-primary)}.guide-syl.stressed .syl{background:color-mix(in srgb,var(--color-primary) 18%,white);color:var(--color-primary-dark)}.guide-syl small{font-size:.75rem;line-height:1.35;color:var(--color-text-muted)}.guide-footer{font-size:.85rem;margin-top:10px}.home-header-text{min-width:0}.plan-badge{display:inline-block;margin:4px 0 0;font-size:.9rem;font-weight:700;color:var(--color-primary-dark);background:#f0fdfa;border-radius:999px;padding:3px 12px}.trial-banner{border-color:var(--color-primary);background:#f0fdfa;display:flex;flex-direction:column;gap:12px}.badge-locked{font-size:.85rem;font-weight:700;border-radius:999px;padding:3px 10px;background:#fef3c7;color:#92400e}.paywall-sheet{gap:16px}.paywall-benefits{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px;font-size:1.05rem;line-height:1.4}.paywall-guarantee{background:#fffbeb;border:1px solid #fde68a;border-radius:12px;padding:12px 14px;font-size:1rem;margin:0}.logout-btn{margin-top:32px}