:root{color-scheme:light;--bg:#f7f8f3;--surface:#ffffff;--surface-soft:#eef4f1;--text:#18201f;--muted:#64716d;--line:#dce4df;--primary:#0f766e;--primary-dark:#115e59;--accent:#b9382f;--gold:#b7791f;--tab:#ffffff}*{box-sizing:border-box}body,html{max-width:100%;min-height:100%;overflow-x:hidden}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,PingFang SC,Microsoft YaHei,sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{min-height:44px;border:0;cursor:pointer}button:disabled{cursor:wait;opacity:.7}.mobile-shell{width:100%;max-width:520px;min-height:100dvh;margin:0 auto;background:var(--bg);padding:16px 16px 92px}.top-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:4px 0 14px}.brand-mark{display:grid;width:40px;height:40px;place-items:center;border-radius:8px;background:var(--primary);color:white;font-weight:700}.eyebrow{margin:0 0 3px;color:var(--muted);font-size:12px}.page-title{margin:0;font-size:24px;line-height:1.18}.section-title{margin:22px 0 10px;font-size:17px}.card{border:1px solid var(--line);border-radius:8px;background:var(--surface);box-shadow:0 1px 0 rgba(24,32,31,.03)}.hero-card{padding:18px;background:linear-gradient(135deg,#fff,#edf6f2 60%,#fbf0df)}.english{margin:0;font-size:21px;line-height:1.35;overflow-wrap:anywhere}.chinese{margin:8px 0 0;color:var(--muted);font-size:15px;line-height:1.55}.row{display:flex;align-items:center;justify-content:space-between;gap:10px;min-width:0;flex-wrap:wrap}.stack{display:grid;grid-gap:12px;gap:12px}.button-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:8px;gap:8px;margin-top:16px}.button-row.two{grid-template-columns:repeat(2,minmax(0,1fr))}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;width:100%;border-radius:8px;padding:0 12px;background:var(--primary);color:white;font-weight:700}.btn.secondary{border:1px solid var(--line);background:white;color:var(--text)}.btn.warn{background:var(--accent)}.pill{display:inline-flex;align-items:center;gap:6px;min-height:28px;max-width:100%;border-radius:999px;padding:4px 10px;background:var(--surface-soft);color:var(--primary-dark);font-size:12px;font-weight:700;overflow-wrap:anywhere}.hint-card{padding:12px;border-left:4px solid var(--gold)}.hint-card strong{color:var(--gold)}.provider-strip{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:8px;gap:8px;margin-top:12px}.provider-strip div{min-width:0;border:1px solid var(--line);border-radius:8px;padding:10px;background:var(--surface)}.provider-strip span{display:block;color:var(--muted);font-size:11px}.provider-strip strong{display:block;margin-top:2px;color:var(--primary-dark);font-size:13px;overflow-wrap:anywhere}.provider-strip p{margin:6px 0 0;color:var(--muted);font-size:12px;line-height:1.45}.scene-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-gap:8px;gap:8px;margin-bottom:12px}.scene-chip{min-width:0;border:1px solid var(--line);border-radius:8px;padding:0 6px;background:var(--surface);color:var(--text);font-size:13px;font-weight:700}.scene-chip.active{border-color:var(--primary);background:var(--surface-soft);color:var(--primary-dark)}.phrase-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.pronunciation-slot{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:8px;gap:8px;margin-top:12px}.pronunciation-slot div{min-width:0;border:1px solid var(--line);border-radius:8px;padding:8px;background:rgba(255,255,255,.72)}.pronunciation-slot span{display:block;color:var(--muted);font-size:11px}.pronunciation-slot strong{display:block;margin-top:3px;font-size:13px;overflow-wrap:anywhere}.module-grid{display:grid;grid-gap:10px;gap:10px}.admin-tile,.dialogue-turn,.module-card,.review-item{padding:14px}.progress-bar{height:8px;overflow:hidden;border-radius:999px;background:#e8ece6}.progress-bar span{display:block;height:100%;border-radius:inherit;background:var(--primary)}.bottom-tabs{position:fixed;right:0;bottom:0;left:0;z-index:20;border-top:1px solid var(--line);background:rgba(255,255,255,.94);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px)}.bottom-tabs-inner{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));max-width:520px;margin:0 auto;padding:8px 8px max(8px,env(safe-area-inset-bottom))}.tab-link{display:grid;min-width:0;min-height:56px;place-items:center;grid-gap:2px;gap:2px;border-radius:8px;color:var(--muted);font-size:11px}.tab-link.active{background:var(--surface-soft);color:var(--primary-dark);font-weight:700}.admin-shell,.auth-shell{width:100%;max-width:960px;min-height:100dvh;margin:0 auto;padding:28px 16px}.auth-card{max-width:420px;margin:0 auto;padding:18px}.form{display:grid;grid-gap:12px;gap:12px}.field{display:grid;grid-gap:6px;gap:6px}.field span{color:var(--muted);font-size:13px}.field input,.field select,.field textarea{width:100%;min-height:44px;border:1px solid var(--line);border-radius:8px;padding:10px 12px;background:white;color:var(--text)}.landing-shell{width:100%;max-width:520px;min-height:100dvh;margin:0 auto;padding:18px 16px 32px}.landing-hero{padding:6px 0 18px}.brand-lockup{display:flex;align-items:center;gap:10px;margin-bottom:18px;font-weight:800}.landing-title{max-width:10ch;margin:8px 0 0;font-size:40px;line-height:1.05}.landing-copy{margin:14px 0 0;color:var(--muted);font-size:16px;line-height:1.58}.landing-actions{display:grid;grid-template-columns:1fr;grid-gap:10px;gap:10px;margin-top:18px}.landing-task{padding:16px;margin-top:6px}.trial-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:8px;gap:8px;margin-top:14px}.trial-steps span{min-width:0;border-radius:8px;padding:9px 6px;background:var(--surface-soft);color:var(--primary-dark);text-align:center;font-size:12px;font-weight:700}.value-grid{display:grid;grid-gap:10px;gap:10px;margin-top:12px}.value-card{display:grid;grid-gap:6px;gap:6px;padding:14px}.value-card svg{color:var(--primary)}.landing-footer-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.onboarding-shell{padding-bottom:32px}.onboarding-form{display:grid;grid-gap:14px;gap:14px;margin-top:14px}.choice-fieldset{min-width:0;margin:0;border:0;padding:0}.choice-fieldset legend{margin-bottom:8px;color:var(--muted);font-size:13px}.choice-grid{display:grid;grid-gap:8px;gap:8px}.choice-card{display:grid;grid-template-columns:auto minmax(0,1fr);grid-gap:10px;gap:10px;min-width:0;border:1px solid var(--line);border-radius:8px;padding:12px;background:var(--surface)}.choice-card input{margin-top:3px}.choice-card small,.choice-card span{display:grid;min-width:0}.choice-card small{margin-top:4px;color:var(--muted);font-size:12px;line-height:1.4}.segmented-control{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));grid-gap:8px;gap:8px}.segmented-control label{min-width:0}.segmented-control input{position:absolute;opacity:0;pointer-events:none}.segmented-control span{display:grid;min-height:42px;place-items:center;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--text);font-size:13px;font-weight:700;text-align:center}.segmented-control input:checked+span{border-color:var(--primary);background:var(--surface-soft);color:var(--primary-dark)}.profile-grid{display:grid;grid-template-columns:1fr;grid-gap:10px;gap:10px}.profile-tile{padding:12px}.profile-tile span{display:block;color:var(--muted);font-size:12px}.profile-tile strong{display:block;margin-top:4px;overflow-wrap:anywhere}.record-dock{position:-webkit-sticky;position:sticky;bottom:88px;display:grid;grid-gap:8px;gap:8px;margin-top:18px}.record-button{min-height:58px;margin-top:10px;border-radius:8px;background:var(--accent);color:white;font-weight:800}.desktop-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));grid-gap:12px;gap:12px}@media (min-width:760px){.mobile-shell{padding-top:24px}.bottom-tabs{right:auto;left:50%;width:520px;transform:translateX(-50%);border-right:1px solid var(--line);border-left:1px solid var(--line)}}