:root{--bg:#f4f8f7;--surface:#fff;--text:#102a2a;--muted:#617574;--line:#dce8e6;--primary:#0f766e;--primary2:#115e59;--soft:#dff4f1;--warning:#b45309;--danger:#b42318;--shadow:0 10px 30px rgba(15,80,75,.08);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:var(--bg)}button,input,textarea,select{font:inherit}.hidden{display:none!important}.muted{color:var(--muted)}.eyebrow{font-size:.72rem;letter-spacing:.11em;font-weight:800;color:var(--primary);margin:0 0 .35rem}.auth-shell{min-height:100vh;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at top right,#d5f5ef,transparent 45%),var(--bg)}.auth-card{width:min(430px,100%);background:var(--surface);padding:32px;border-radius:24px;box-shadow:var(--shadow);border:1px solid var(--line)}.auth-card h1{font-size:2rem;line-height:1.1;margin:.6rem 0}.brand-mark{display:grid;place-items:center;width:62px;height:62px;border-radius:18px;background:linear-gradient(145deg,var(--primary),#16a394);color:#fff;font-weight:900;font-size:2rem;box-shadow:0 10px 22px rgba(15,118,110,.25)}.brand-mark.small{width:44px;height:44px;border-radius:13px;font-size:1.4rem}.stack{display:grid;gap:15px;margin-top:24px}label{display:grid;gap:7px;font-size:.9rem;font-weight:700}input,textarea,select{width:100%;border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:#fff;color:var(--text);outline:none}input:focus,textarea:focus,select:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(15,118,110,.12)}textarea{resize:vertical;min-height:120px}.btn{border:0;border-radius:12px;padding:11px 15px;font-weight:800;cursor:pointer;transition:.15s}.btn:disabled{opacity:.55;cursor:not-allowed}.btn.primary{background:var(--primary);color:#fff}.btn.primary:hover{background:var(--primary2)}.btn.secondary{background:var(--soft);color:var(--primary2)}.btn.ghost{background:#fff;border:1px solid var(--line);color:var(--text)}.btn.danger{background:#fee4e2;color:var(--danger)}.error-text{color:var(--danger);min-height:1.2em;font-size:.88rem}.app-shell{min-height:100vh;display:grid;grid-template-columns:260px 1fr}.sidebar{position:sticky;top:0;height:100vh;background:#0b2f2c;color:#dff4f1;padding:24px 18px;display:flex;flex-direction:column}.brand-row{display:flex;align-items:center;gap:12px;margin-bottom:30px}.brand-row strong{display:block;color:#fff}.brand-row span{display:block;color:#a7d9d2;font-size:.82rem}.side-nav{display:grid;gap:8px}.side-nav button{border:0;background:transparent;color:#b9dad6;text-align:left;border-radius:12px;padding:13px 14px;font-weight:750;cursor:pointer}.side-nav button.active,.side-nav button:hover{background:rgba(255,255,255,.1);color:#fff}.side-nav button span{margin-left:10px}.sidebar-foot{margin-top:auto;font-size:.82rem;color:#a7d9d2;display:flex;align-items:center;gap:8px}.status-dot{width:9px;height:9px;border-radius:50%;background:#f59e0b}.status-dot.ready{background:#22c55e}.main-column{min-width:0;padding:0 32px 38px}.topbar{height:96px;display:flex;align-items:center;justify-content:space-between;gap:20px}.topbar h2{margin:0;font-size:1.65rem}.top-actions{display:flex;gap:8px}.icon-btn{width:42px;height:42px;border:1px solid var(--line);border-radius:12px;background:#fff;cursor:pointer}.view{display:none;animation:fade .18s ease}.view.active{display:block}@keyframes fade{from{opacity:.4;transform:translateY(4px)}to{opacity:1;transform:none}}.grid{display:grid;gap:18px}.grid.cols-4{grid-template-columns:repeat(4,1fr)}.grid.cols-2{grid-template-columns:repeat(2,1fr)}.card{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:20px;box-shadow:0 4px 18px rgba(15,80,75,.04)}.hero{background:linear-gradient(135deg,#0f766e,#0c5d57);color:#fff;border:0;padding:26px}.hero .muted{color:#d7f3ef}.hero h3{font-size:1.65rem;margin:.3rem 0}.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.hero .btn.primary{background:#fff;color:var(--primary2)}.hero .btn.secondary{background:rgba(255,255,255,.14);color:#fff}.metric{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.metric strong{font-size:1.75rem}.metric .chip{font-size:.75rem}.chip{display:inline-flex;align-items:center;padding:5px 9px;border-radius:999px;background:var(--soft);color:var(--primary2);font-weight:800}.module-band{position:relative;overflow:hidden}.module-band::after{content:"";position:absolute;bottom:0;left:0;height:4px;width:var(--p,33%);background:var(--primary)}.section-head{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:26px 0 12px}.section-head h3{margin:0}.quick-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.quick-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;text-align:left;cursor:pointer}.quick-card:hover{border-color:#92cfc7;transform:translateY(-1px)}.quick-card b{display:block;margin-bottom:5px}.progress-line{height:9px;background:#e8f0ef;border-radius:999px;overflow:hidden}.progress-line span{display:block;height:100%;background:var(--primary);border-radius:999px}.lesson-list{display:grid;gap:12px}.lesson-step{border-left:4px solid var(--primary);padding:10px 14px;background:#f7fbfa;border-radius:0 12px 12px 0}.lesson-step h4{margin:.1rem 0 .35rem}.lesson-step p,.lesson-step li{line-height:1.55}.chat-layout{height:calc(100vh - 134px);display:grid;grid-template-rows:auto 1fr auto;background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden}.chat-head{padding:16px 18px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center}.chat-head h3{margin:0}.quick-actions{padding:10px 14px;display:flex;gap:8px;overflow:auto;border-bottom:1px solid var(--line)}.quick-actions button{white-space:nowrap}.messages{overflow:auto;padding:18px;display:flex;flex-direction:column;gap:14px}.message{max-width:min(760px,88%);padding:13px 15px;border-radius:16px;line-height:1.55;white-space:pre-wrap}.message.assistant{align-self:flex-start;background:#edf7f5;border-bottom-left-radius:4px}.message.user{align-self:flex-end;background:var(--primary);color:#fff;border-bottom-right-radius:4px}.chat-compose{display:grid;grid-template-columns:auto 1fr auto;gap:8px;padding:12px;border-top:1px solid var(--line);background:#fbfdfd}.chat-compose textarea{min-height:48px;max-height:140px;resize:none}.mic-btn{width:48px;border:1px solid var(--line);background:#fff;border-radius:12px;cursor:pointer}.mic-btn.listening{background:#fee4e2;color:var(--danger)}.practice-tabs{display:flex;gap:8px;overflow:auto;margin-bottom:16px}.practice-tabs button{white-space:nowrap}.practice-tabs button.active{background:var(--primary);color:#fff}.question{padding:15px 0;border-bottom:1px solid var(--line)}.question:last-child{border-bottom:0}.options{display:grid;gap:8px;margin-top:10px}.option{display:flex;align-items:center;gap:9px;border:1px solid var(--line);border-radius:11px;padding:10px;cursor:pointer}.timer{font-variant-numeric:tabular-nums;font-weight:900;color:var(--primary2)}.feedback-item{padding:11px;border-radius:10px;margin-top:8px}.feedback-item.ok{background:#e9f9ef}.feedback-item.bad{background:#fff1f0}.writing-editor{min-height:300px}.word-count{font-size:.85rem;color:var(--muted)}.chart{display:flex;align-items:end;gap:8px;height:150px;padding-top:12px}.bar{flex:1;min-width:8px;background:linear-gradient(#19a491,#0f766e);border-radius:7px 7px 2px 2px;position:relative}.bar span{position:absolute;bottom:-24px;left:50%;transform:translateX(-50%);font-size:.65rem;color:var(--muted)}.band-table{display:grid;gap:12px}.band-row{display:grid;grid-template-columns:100px 1fr 45px;align-items:center;gap:12px}.empty{padding:34px;text-align:center;color:var(--muted)}.toast{position:fixed;right:20px;top:20px;z-index:999;background:#123b38;color:#fff;border-radius:12px;padding:12px 16px;opacity:0;pointer-events:none;transform:translateY(-8px);transition:.2s}.toast.show{opacity:1;transform:none}.bottom-nav{display:none}.divider{height:1px;background:var(--line);margin:18px 0}.model-answer{background:#f6fbfa;border:1px dashed #91cfc6;padding:15px;border-radius:12px;line-height:1.65}.notice{border-left:4px solid #f59e0b;background:#fff8e6;padding:12px 14px;border-radius:0 12px 12px 0}.loader{display:inline-block;width:18px;height:18px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}
@media(max-width:980px){.grid.cols-4{grid-template-columns:repeat(2,1fr)}.quick-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:720px){body{padding-bottom:70px}.app-shell{display:block}.sidebar{display:none}.main-column{padding:0 14px 20px}.topbar{height:78px}.topbar h2{font-size:1.35rem}.topbar .eyebrow{display:none}.bottom-nav{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;z-index:30;left:0;right:0;bottom:0;background:#fff;border-top:1px solid var(--line);padding:7px max(5px,env(safe-area-inset-right)) calc(7px + env(safe-area-inset-bottom)) max(5px,env(safe-area-inset-left))}.bottom-nav button{border:0;background:transparent;color:var(--muted);display:grid;place-items:center;gap:2px;font-size:.67rem;font-weight:750;padding:3px}.bottom-nav button span{font-size:1.25rem}.bottom-nav button.active{color:var(--primary)}.grid.cols-4,.grid.cols-2,.quick-grid{grid-template-columns:1fr}.hero{padding:21px}.hero h3{font-size:1.35rem}.chat-layout{height:calc(100vh - 165px);border-radius:16px}.message{max-width:92%}.chat-compose{grid-template-columns:auto 1fr auto;padding:8px}.chat-compose textarea{padding:10px}.card{padding:16px}.auth-card{padding:24px}.auth-card h1{font-size:1.7rem}.band-row{grid-template-columns:83px 1fr 36px}}

/* Guided Teacher v1.1 */
.teacher-welcome{display:flex;align-items:center;justify-content:space-between;gap:22px;background:linear-gradient(135deg,#e8f8f5,#fff);border-color:#a9ddd6;padding:24px}.teacher-welcome h3{font-size:1.55rem;margin:.2rem 0 .45rem}.teacher-welcome p{max-width:760px;line-height:1.55;margin:.2rem 0}.big-btn{padding:15px 24px;font-size:1rem;white-space:nowrap}.learning-path{display:grid;gap:10px}.path-step{width:100%;display:grid;grid-template-columns:44px 1fr auto;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px 16px;text-align:left;color:var(--text);cursor:pointer;box-shadow:0 3px 12px rgba(15,80,75,.03)}.path-step:hover,.path-step.current{border-color:#6fc7bd;background:#f1fbf9}.path-step>span:nth-child(2){display:grid;gap:3px}.path-step small{color:var(--muted)}.path-step>span:last-child{font-size:.8rem;font-weight:800;color:var(--primary)}.step-no{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;background:var(--soft);color:var(--primary2);font-weight:900}.path-step.current .step-no{background:var(--primary);color:#fff}.how-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.how-card{display:grid;gap:6px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px}.how-card>span{width:30px;height:30px;border-radius:9px;display:grid;place-items:center;background:#0f766e;color:#fff;font-weight:900}.how-card small{color:var(--muted);line-height:1.4}.course-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.course-card{display:grid;grid-template-columns:48px 1fr auto;align-items:center;gap:13px;background:#fff;border:1px solid var(--line);border-radius:17px;padding:16px;text-align:left;color:var(--text);cursor:pointer}.course-card:hover{border-color:#79cbbf;transform:translateY(-1px);box-shadow:0 8px 20px rgba(15,80,75,.07)}.course-card>span:nth-child(2){display:grid;gap:4px}.course-card small{color:var(--muted);line-height:1.35}.course-icon{width:44px;height:44px;border-radius:13px;background:var(--soft);display:grid;place-items:center;font-size:1.35rem}.course-arrow{font-size:1.8rem;color:var(--primary)}.teacher-shell{height:calc(100vh - 134px);display:grid;grid-template-rows:auto auto 1fr auto auto;background:#fff;border:1px solid var(--line);border-radius:20px;overflow:hidden}.teacher-top{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:13px;padding:15px 18px;border-bottom:1px solid var(--line);background:#fbfefd}.teacher-top h3{margin:.05rem 0}.teacher-avatar{width:45px;height:45px;border-radius:14px;background:linear-gradient(145deg,var(--primary),#16a394);color:#fff;display:grid;place-items:center;font-weight:900;font-size:1.35rem}.class-switcher{display:flex;gap:8px;overflow:auto;padding:10px 13px;border-bottom:1px solid var(--line)}.class-switcher button{white-space:nowrap}.teacher-messages{background:linear-gradient(#fff,#f8fcfb)}.teacher-help{display:flex;gap:7px;overflow:auto;padding:9px 12px;border-top:1px solid var(--line);background:#f7fbfa}.mini-action{white-space:nowrap;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--primary2);padding:8px 11px;font-size:.8rem;font-weight:800;cursor:pointer}.mini-action:hover{background:var(--soft)}.practice-intro{margin-bottom:14px;background:linear-gradient(135deg,#f2fbfa,#fff)}.writing-actions{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:10px}.listening-actions{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}
@media(max-width:980px){.how-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:720px){.teacher-welcome{display:grid;padding:18px}.big-btn{width:100%}.course-grid,.how-grid{grid-template-columns:1fr}.path-step{grid-template-columns:38px 1fr auto;padding:12px}.teacher-shell{height:calc(100vh - 154px);border-radius:15px}.teacher-top{grid-template-columns:auto 1fr}.teacher-top .chip{grid-column:2;justify-self:start}.teacher-help{padding:7px}.writing-actions{align-items:flex-start;display:grid}.writing-actions>div{display:flex;gap:6px;flex-wrap:wrap}.course-card{grid-template-columns:44px 1fr auto;padding:14px}}