:root{
  --bg:#0b0b0d;--panel:#131316;--panel2:#18181c;--text:#f5f5f7;--muted:#96969f;--line:#2a2a30;--soft:#202026;--accent:#f0f0f0;--accentText:#0b0b0d;--ok:#92d7aa;--warn:#e1b76c;--danger:#dd7c7c;
  font-family:Inter,-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text",Segoe UI,sans-serif;color-scheme:dark;
}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text)}body{font-size:15px}.hidden{display:none!important}.grain{pointer-events:none;position:fixed;inset:0;opacity:.035;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.7'/%3E%3C/svg%3E");z-index:99}.app{display:grid;grid-template-columns:240px minmax(0,1fr);min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;border-right:1px solid var(--line);padding:22px 16px;display:flex;flex-direction:column;background:rgba(11,11,13,.96)}.brand{display:flex;gap:11px;align-items:center}.brand-dot{width:34px;height:34px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;font-size:23px}.brand strong,.brand span{display:block}.brand strong{font-size:13px;letter-spacing:.12em}.brand span{font-size:11px;color:var(--muted);margin-top:2px}.sidebar nav{display:grid;gap:4px;margin-top:34px}.nav-btn,.text-btn{border:0;background:transparent;color:var(--muted);text-align:left;padding:11px 12px;border-radius:10px;font:inherit;cursor:pointer}.nav-btn:hover,.nav-btn.active{background:var(--soft);color:var(--text)}.sidebar-bottom{margin-top:auto;display:grid;gap:12px}.status-pill{font-size:11px;padding:9px 10px;border:1px solid var(--line);border-radius:10px;color:var(--muted)}.main{padding:24px 34px 60px;min-width:0}.topbar{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:34px}.topbar h1{font-size:25px;margin:3px 0 0}.eyebrow{font-size:10px;letter-spacing:.14em;color:var(--muted);margin:0}.top-actions,.inline-actions{display:flex;gap:8px;flex-wrap:wrap}button,input,textarea,select{font:inherit}.primary,.ghost{min-height:42px;border-radius:11px;padding:0 15px;cursor:pointer}.primary{background:var(--accent);color:var(--accentText);border:1px solid var(--accent)}.ghost{background:transparent;color:var(--text);border:1px solid var(--line)}.small{min-height:36px;padding:0 12px;font-size:13px}.view{display:none}.view.active{display:block}.hero-panel{min-height:290px;border:1px solid var(--line);border-radius:22px;padding:34px;display:grid;grid-template-columns:1.4fr .6fr;align-items:center;overflow:hidden;background:radial-gradient(circle at 90% 20%,#1e1e25 0,transparent 45%),var(--panel)}.hero-panel h2{font-size:clamp(32px,5vw,58px);line-height:.98;letter-spacing:-.045em;margin:12px 0 16px;max-width:820px}.hero-panel h2 span{color:#777781}.hero-copy{color:var(--muted);max-width:720px;line-height:1.6}.brain-orbit{width:190px;height:190px;position:relative;justify-self:center}.orbit{position:absolute;border:1px solid #363640;border-radius:50%;inset:10%}.o2{inset:25%;transform:rotate(45deg)}.core{position:absolute;inset:0;display:grid;place-items:center;font-size:46px}.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:14px 0}.metric{padding:18px;border:1px solid var(--line);border-radius:16px;background:var(--panel)}.metric strong{font-size:30px;display:block}.metric span{color:var(--muted);font-size:12px}.metric-grid.mini .metric strong{font-size:24px}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:14px}.panel{border:1px solid var(--line);border-radius:16px;background:var(--panel);padding:18px;margin-top:14px}.panel-head{display:flex;justify-content:space-between;align-items:center;gap:12px}.panel h3{margin:0;font-size:15px}.stack{display:grid;gap:8px;margin-top:14px}.compact{gap:5px}.row{border:1px solid var(--line);background:var(--panel2);border-radius:12px;padding:13px;display:flex;align-items:center;gap:12px;justify-content:space-between}.row-main{min-width:0}.row-title{font-weight:650;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.row-sub{color:var(--muted);font-size:12px;margin-top:4px;overflow-wrap:anywhere}.tag{display:inline-flex;padding:4px 7px;border-radius:999px;background:var(--soft);color:var(--muted);font-size:10px}.section-intro{display:flex;justify-content:space-between;gap:18px;align-items:end;margin-bottom:16px}.section-intro h2{font-size:32px;margin:0 0 7px}.section-intro p{margin:0;color:var(--muted);max-width:700px}.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px}.account-card{border:1px solid var(--line);border-radius:16px;padding:18px;background:var(--panel)}.account-head{display:flex;gap:12px;align-items:center}.account-head img{width:42px;height:42px;border-radius:50%;background:var(--soft)}.account-head strong,.account-head span{display:block}.account-head span{color:var(--muted);font-size:12px}.account-actions{display:flex;gap:8px;margin-top:16px}.drop-panel{border:1px dashed #41414a;border-radius:18px;padding:24px;background:var(--panel);display:grid;gap:12px}.drop-panel input[type=file]{padding:18px;border-radius:12px;background:var(--soft);border:1px solid var(--line)}textarea,input,select{width:100%;background:#101013;border:1px solid var(--line);border-radius:10px;color:var(--text);padding:12px;outline:none}textarea{min-height:90px;resize:vertical}input:focus,textarea:focus,select:focus{border-color:#646471}.chat-shell{max-width:900px;margin:0 auto;border:1px solid var(--line);border-radius:22px;background:var(--panel);overflow:hidden}.chat-heading{padding:24px;border-bottom:1px solid var(--line);display:flex;gap:14px;align-items:center}.chat-heading h2{margin:0}.chat-heading p{color:var(--muted);margin:4px 0 0}.avatar{width:48px;height:48px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center}.messages{min-height:330px;max-height:540px;overflow:auto;padding:24px;display:flex;flex-direction:column;gap:10px}.msg{max-width:78%;padding:12px 14px;border-radius:15px;line-height:1.55;white-space:pre-wrap}.msg.bot{background:var(--soft);align-self:flex-start}.msg.user{background:#ececee;color:#111;align-self:flex-end}.chat-form{border-top:1px solid var(--line);padding:14px;display:grid;grid-template-columns:1fr auto;gap:10px}.notice{color:var(--muted);line-height:1.55}.notice strong{color:var(--text)}.login-view,.student-view{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{width:min(440px,100%);display:grid;gap:15px;border:1px solid var(--line);border-radius:22px;background:var(--panel);padding:30px}.login-card h1{font-size:48px;letter-spacing:-.04em;margin:0}.login-card label,.dialog-card label{display:grid;gap:7px;color:var(--muted);font-size:12px}.brain-mark{font-size:40px}.student-view{align-content:start;place-items:stretch}.student-top{width:min(920px,100%);margin:10px auto 0;display:flex;justify-content:space-between;align-items:center}.student-card{width:min(760px,100%);margin:70px auto 0;text-align:center}.student-card h1{font-size:56px;letter-spacing:-.05em;margin:12px 0 20px}.student-face{width:90px;height:90px;border:1px solid var(--line);border-radius:50%;margin:0 auto 25px;display:flex;justify-content:center;align-items:center;gap:18px;position:relative;font-size:24px}.student-face i{position:absolute;width:26px;height:8px;border-bottom:2px solid var(--muted);bottom:23px;border-radius:50%}.student-card .messages{text-align:left;border:1px solid var(--line);border-radius:18px;background:var(--panel);min-height:260px}.student-card .chat-form{border:0;padding:14px 0 0}.toast{position:fixed;right:20px;bottom:20px;z-index:110;max-width:380px;padding:12px 14px;background:#f4f4f5;color:#111;border-radius:12px;opacity:0;transform:translateY(10px);transition:.2s;pointer-events:none}.toast.show{opacity:1;transform:translateY(0)}dialog{border:0;background:transparent;color:var(--text);width:min(720px,calc(100% - 32px))}dialog::backdrop{background:rgba(0,0,0,.7)}.dialog-card{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:20px;display:grid;gap:15px;max-height:80vh}.icon-btn{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:transparent;color:var(--text);font-size:22px}.folder-results{display:grid;gap:6px;overflow:auto;max-height:360px}.folder-btn{text-align:left;padding:11px;border-radius:10px;border:1px solid var(--line);background:var(--panel2);color:var(--text);cursor:pointer}.folder-btn span{display:block;color:var(--muted);font-size:11px;margin-top:3px}.dialog-actions{display:flex;justify-content:flex-end}.empty{color:var(--muted);padding:20px;text-align:center;border:1px dashed var(--line);border-radius:12px}.danger{color:var(--danger)}.ok{color:var(--ok)}.warn{color:var(--warn)}
@media (max-width:900px){.app{grid-template-columns:1fr}.sidebar{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line)}.sidebar nav{display:flex;overflow:auto}.sidebar-bottom{display:none}.main{padding:20px}.hero-panel{grid-template-columns:1fr}.brain-orbit{display:none}.metric-grid{grid-template-columns:repeat(2,1fr)}.two-col{grid-template-columns:1fr}.topbar{align-items:flex-start}.section-intro{align-items:flex-start;flex-direction:column}.student-card{margin-top:35px}}
@media (max-width:560px){.main{padding:16px}.topbar{flex-direction:column}.top-actions{width:100%}.top-actions button{flex:1}.hero-panel{padding:24px}.hero-panel h2{font-size:38px}.metric-grid{grid-template-columns:1fr 1fr}.metric strong{font-size:25px}.chat-form{grid-template-columns:1fr}.msg{max-width:92%}.student-card h1{font-size:42px}.student-card .chat-form{grid-template-columns:1fr}.row{align-items:flex-start;flex-direction:column}.account-actions{flex-wrap:wrap}}

.voice-select{width:auto;min-width:150px;max-width:210px;min-height:36px;padding:0 32px 0 10px}.student-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.rename-search{display:grid;grid-template-columns:1fr auto;gap:10px;margin-top:14px}.rename-row{align-items:stretch}.rename-row .row-main{flex:1}.rename-controls{display:grid;grid-template-columns:minmax(180px,1fr) auto auto auto;gap:8px;align-items:center;min-width:min(520px,100%)}.rename-controls input{min-width:0}.rename-reason{grid-column:1/-1;color:var(--muted);font-size:11px}.inbox-rename{margin-top:8px;display:grid;grid-template-columns:120px minmax(180px,1fr);gap:8px;align-items:center}.inbox-rename span{font-size:11px;color:var(--muted)}
@media (max-width:760px){.voice-select{max-width:150px}.rename-search{grid-template-columns:1fr}.rename-controls{grid-template-columns:1fr 1fr}.rename-controls input{grid-column:1/-1}.rename-reason{grid-column:1/-1}.inbox-rename{grid-template-columns:1fr}.student-actions{justify-content:flex-end}}

.rename-batch{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin:10px 0 14px}.rename-check{display:flex;align-items:center;padding-right:8px}.rename-check input{width:20px;height:20px}.rename-batch .muted{font-size:13px;opacity:.72}
.project-form{display:grid;grid-template-columns:1fr 2fr auto;gap:10px}.standalone{border:1px solid var(--line);border-radius:14px;background:var(--panel);margin-bottom:14px}.account-card h3{font-size:22px;margin:10px 0 6px}@media(max-width:760px){.project-form{grid-template-columns:1fr}}

/* Cerebro Face v8 */
.brain-face-wrap{display:flex;align-items:center;justify-content:center;padding:20px 10px 8px}
.brain-face{--look-x:0px;--look-y:0px;position:relative;width:min(430px,88vw);aspect-ratio:2.05/1;border:1px solid var(--line,#e5e5e5);border-radius:999px;background:linear-gradient(180deg,#fff,#f7f7f5);overflow:hidden;isolation:isolate}
.brain-face::after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 50% 35%,rgba(0,0,0,.025),transparent 58%);pointer-events:none}
.brain-eyes{position:absolute;left:0;right:0;top:25%;display:flex;justify-content:center;gap:22%;z-index:2}
.brain-eye{position:relative;width:25%;height:58px;background:#151515;border-radius:50% 50% 46% 46%;overflow:hidden;transform-origin:center;animation:brainBlink 6.4s infinite}
.brain-pupil{position:absolute;width:16px;height:16px;border-radius:50%;background:#fff;left:50%;top:50%;transform:translate(calc(-50% + var(--look-x)),calc(-50% + var(--look-y)));transition:transform .28s ease}
.brain-mouth{position:absolute;left:50%;top:66%;width:68px;height:9px;border-radius:0 0 40px 40px;border-bottom:7px solid #151515;transform:translateX(-50%);transition:.18s ease;z-index:2}
.brain-face[data-state="thinking"] .brain-eye:first-child{transform:translateY(4px) rotate(4deg)}
.brain-face[data-state="thinking"] .brain-eye:last-child{transform:translateY(-2px) rotate(-4deg)}
.brain-face[data-state="thinking"] .brain-mouth{width:28px;border-radius:50%;transform:translateX(-50%) rotate(-8deg)}
.brain-face[data-state="happy"] .brain-mouth{width:78px;height:24px;border-bottom-width:8px;border-radius:0 0 80px 80px}
.brain-face[data-state="speaking"] .brain-mouth{width:52px;height:26px;background:#151515;border:0;border-radius:48% 48% 54% 54%;animation:brainTalk .18s infinite alternate}
.brain-face[data-state="searching"] .brain-pupil{animation:brainScan 1.5s ease-in-out infinite}
.brain-face-caption{text-align:center;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted,#777);margin:5px 0 14px}
@keyframes brainBlink{0%,44%,48%,100%{transform:scaleY(1)}46%{transform:scaleY(.06)}}
@keyframes brainTalk{from{height:8px;width:58px}to{height:30px;width:42px}}
@keyframes brainScan{0%,100%{margin-left:-14px}50%{margin-left:14px}}
@media (prefers-reduced-motion:reduce){.brain-eye,.brain-mouth,.brain-pupil{animation:none!important}}
@media(max-width:600px){.brain-face{width:94vw}.brain-eye{height:44px}.brain-eyes{gap:19%}}