/* =====================================================================
   DADLEARNED — SITE.CSS (scarlet & black design system)
   ---------------------------------------------------------------------
   Consolidated from the approved prototype (algebra-i-prototype.html)
   and the verified homework.html reference build. This file was
   previously just Bootstrap scaffolding defaults — the pages linked to
   it but the actual design system was never shipped, so every page
   rendered unstyled. This restores the full scarlet/black system across
   every page: login, dashboard, homework, practice arcade, study guide,
   teacher overview, and question bank.
   ===================================================================== */

:root{
  --scarlet:#CC0000;
  --scarlet-bright:#E4172B;
  --scarlet-deep:#8A0012;
  --scarlet-tint:#FCEBEC;
  --scarlet-tint-2:#F7D6D9;
  --ink:#131013;
  --ink-2:#1E1A1E;
  --ink-3:#2A252A;
  --paper:#FFFFFF;
  --paper-2:#F6F4F2;
  --paper-3:#EEEAE6;
  --gray-1:#131013;
  --gray-2:#4A444A;
  --gray-3:#7A737A;
  --gray-4:#A8A0A6;
  --good:#1F9D63;
  --good-tint:#E7F4EE;
  --good-deep:#146B43;
  --warn:#E0A100;
  --shadow-sm:0 1px 2px rgba(19,16,19,.06), 0 2px 8px rgba(19,16,19,.05);
  --shadow-md:0 4px 12px rgba(19,16,19,.08), 0 18px 40px rgba(19,16,19,.10);
  --shadow-scarlet:0 10px 30px rgba(204,0,0,.28);
  --r:16px; --r-sm:11px; --r-lg:24px;
  --fdisp:'Clash Display', system-ui, sans-serif;
  --fbody:'Satoshi', system-ui, -apple-system, sans-serif;
  --fmono:ui-monospace, 'SF Mono', 'Cascadia Mono', Menlo, monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--fbody);color:var(--ink);background:var(--paper-2);-webkit-font-smoothing:antialiased;line-height:1.5}
h1,h2,h3,h4{font-family:var(--fdisp);margin:0;line-height:1.05;letter-spacing:-.01em}
p{margin:0}
a{color:inherit;text-decoration:none}
.mono{font-family:var(--fmono)}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ==================== BUTTONS (shared) ==================== */
.btn{font-family:var(--fbody);font-weight:700;font-size:15px;border:none;border-radius:11px;cursor:pointer;padding:12px 22px;
  display:inline-flex;align-items:center;justify-content:center;gap:8px;transition:transform .08s,box-shadow .15s,background .15s}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn-scarlet{background:var(--scarlet);color:#fff;box-shadow:var(--shadow-scarlet)}
.btn-scarlet:hover:not(:disabled){background:var(--scarlet-bright)}
.btn-block{width:100%}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000}
.btn-ghost{background:transparent;color:var(--gray-3);border:1px solid var(--paper-3)}
.btn-ghost:hover{background:var(--paper-3);color:var(--ink)}

/* ==================== LOGIN ==================== */
.login-wrap{min-height:100vh;background:var(--ink);color:#fff;position:relative;overflow:hidden;
  display:flex;align-items:center;justify-content:center;padding:40px 20px}
.login-wrap::before{content:"";position:absolute;inset:0;
  background:radial-gradient(900px 500px at 78% -5%, rgba(204,0,0,.28), transparent 60%),
  radial-gradient(700px 500px at 5% 108%, rgba(204,0,0,.14), transparent 55%)}
.login-wrap::after{content:"";position:absolute;inset:0;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);
  background-size:44px 44px;mask:radial-gradient(circle at 50% 40%,#000,transparent 75%)}
.login-card{position:relative;z-index:2;width:100%;max-width:940px;display:grid;grid-template-columns:1.15fr 1fr;
  background:rgba(30,26,30,.55);backdrop-filter:blur(14px);border:1px solid rgba(255,255,255,.09);
  border-radius:var(--r-lg);overflow:hidden;box-shadow:0 40px 90px rgba(0,0,0,.5)}
@media(max-width:800px){.login-card{grid-template-columns:1fr}}
.login-left{padding:52px 48px}
.brandmark{display:flex;align-items:center;gap:12px;margin-bottom:44px}
.brandmark .glyph{width:44px;height:44px;border-radius:12px;background:linear-gradient(145deg,var(--scarlet-bright),var(--scarlet-deep));
  display:grid;place-items:center;color:#fff;font-family:var(--fdisp);font-weight:700;font-size:22px;box-shadow:var(--shadow-scarlet)}
.brandmark .bm-t{font-family:var(--fdisp);font-weight:700;font-size:18px;letter-spacing:.02em}
.brandmark .bm-s{font-family:var(--fmono);font-size:9.5px;letter-spacing:2.5px;color:var(--gray-4);text-transform:uppercase;margin-top:2px}
.login-eyebrow{font-family:var(--fmono);font-size:11px;letter-spacing:3px;color:var(--scarlet-bright);text-transform:uppercase;margin-bottom:16px}
.login-h{font-family:var(--fdisp);font-weight:700;font-size:clamp(38px,5.5vw,58px);line-height:.98;margin-bottom:20px}
.login-h .mk{position:relative;white-space:nowrap}
.login-h .mk::after{content:"";position:absolute;left:-2px;right:-2px;bottom:.08em;height:.34em;background:var(--scarlet);z-index:-1;border-radius:2px}
.login-sub{color:rgba(255,255,255,.7);font-size:15.5px;max-width:38ch;margin-bottom:28px}
.login-tags{display:flex;gap:8px;flex-wrap:wrap}
.ltag{font-family:var(--fmono);font-size:11px;color:rgba(255,255,255,.8);border:1px solid rgba(255,255,255,.16);border-radius:20px;padding:5px 12px;display:flex;align-items:center;gap:6px}
.ltag i{color:var(--scarlet-bright)}
.login-right{background:var(--paper);color:var(--ink);padding:44px 40px;display:flex;flex-direction:column;justify-content:center}
.lr-h{font-family:var(--fdisp);font-weight:600;font-size:22px;margin-bottom:6px}
.lr-p{color:var(--gray-3);font-size:13.5px;margin-bottom:24px}
.field{margin-bottom:14px}
.field label{font-size:12px;font-weight:700;color:var(--gray-2);display:block;margin-bottom:6px}
.field input{width:100%;font-family:var(--fbody);font-size:15px;padding:12px 14px;border:1.5px solid var(--paper-3);border-radius:10px;background:var(--paper-2);transition:.15s}
.field input:focus{outline:none;border-color:var(--scarlet);background:#fff}
.lr-foot{margin-top:16px;font-size:12px;color:var(--gray-4);text-align:center}
.alert-err{background:var(--scarlet-tint);color:var(--scarlet-deep);border-left:3px solid var(--scarlet);border-radius:8px;padding:11px 14px;font-size:13px;font-weight:600;margin-bottom:16px}

/* ==================== SHARED APP CHROME ==================== */
.appbar{height:60px;background:var(--ink);display:flex;align-items:center;gap:16px;padding:0 20px;color:#fff;position:sticky;top:0;z-index:50}
.appbar .glyph{width:32px;height:32px;border-radius:9px;background:linear-gradient(145deg,var(--scarlet-bright),var(--scarlet-deep));display:grid;place-items:center;font-family:var(--fdisp);font-weight:700;font-size:16px}
.appbar .wm{font-family:var(--fdisp);font-weight:700;font-size:15px;letter-spacing:.02em}
.appbar .back{color:rgba(255,255,255,.6);font-weight:600;font-size:13px;display:flex;align-items:center;gap:6px;cursor:pointer;background:none;border:none}
.appbar .back:hover{color:#fff}
.appbar-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.streak{display:flex;align-items:center;gap:6px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.1);border-radius:20px;padding:6px 11px;font-size:13px;font-weight:600}
.streak i{color:var(--scarlet-bright);font-size:16px}
.avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(145deg,var(--scarlet),var(--scarlet-deep));display:grid;place-items:center;color:#fff;font-family:var(--fdisp);font-weight:700;font-size:14px}

.wrap{max-width:1000px;margin:0 auto;padding:26px 20px 90px}

/* ==================== DASHBOARD ==================== */
.dash-greeting{margin-bottom:24px}
.dash-eyebrow{font-family:var(--fmono);font-size:11px;letter-spacing:2.5px;color:var(--scarlet);text-transform:uppercase;margin-bottom:8px}
.dash-name{font-size:clamp(28px,4.5vw,40px);font-weight:700}
.dash-sub{color:var(--gray-3);font-size:14.5px;margin-top:8px}

.ring-row{display:flex;gap:18px;margin-bottom:26px;flex-wrap:wrap}
.ring-card{background:var(--paper);border:1px solid var(--paper-3);border-radius:var(--r);box-shadow:var(--shadow-sm);padding:18px 22px;display:flex;align-items:center;gap:14px;flex:1;min-width:180px}
.ring-svg{width:76px;height:76px;transform:rotate(-90deg);flex-shrink:0}
.ring-bg{fill:none;stroke:var(--paper-3);stroke-width:12}
.ring-fill{fill:none;stroke-width:12;stroke-linecap:round}
.ring-w1,.ring-w2,.ring-w3{stroke:var(--scarlet)}
.ring-info{display:flex;flex-direction:column}
.ring-pct{font-family:var(--fdisp);font-weight:700;font-size:22px}
.ring-label{font-size:12px;color:var(--gray-3);font-weight:600}

.week-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:26px}
@media(max-width:760px){.week-grid{grid-template-columns:1fr}}
.week-card{display:block;background:var(--paper);border:1px solid var(--paper-3);border-radius:var(--r);padding:20px;box-shadow:var(--shadow-sm);transition:transform .15s,box-shadow .15s;cursor:pointer}
.week-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.wc-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}
.wc-week{font-family:var(--fmono);font-size:11px;font-weight:700;letter-spacing:1.5px;color:var(--scarlet);background:var(--scarlet-tint);padding:4px 9px;border-radius:6px}
.wc-arrow{color:var(--gray-4)}
.wc-focus{font-size:14px;font-weight:600;color:var(--ink);margin-bottom:16px;min-height:36px}
.wc-days{display:flex;gap:5px;margin-bottom:14px}
.wc-day{flex:1;height:26px;border-radius:6px;display:grid;place-items:center;font-family:var(--fmono);font-size:10px;font-weight:700;background:var(--paper-2);color:var(--gray-4);border:1px solid var(--paper-3)}
.wc-day.done{background:var(--scarlet);color:#fff;border-color:var(--scarlet)}
.wc-day.partial{background:var(--warn);color:#fff;border-color:var(--warn)}
.wc-prog{display:flex;align-items:center;gap:10px}
.wc-pbar{flex:1;height:8px;background:var(--paper-3);border-radius:20px;overflow:hidden}
.wc-pfill{height:100%;background:linear-gradient(90deg,var(--scarlet),var(--scarlet-bright));border-radius:20px;transition:width .5s}
.wc-pnum{font-family:var(--fmono);font-size:11.5px;color:var(--gray-3);font-weight:600;white-space:nowrap}

.mission-card{background:var(--ink);color:#fff;border-radius:var(--r-lg);padding:26px 28px;position:relative;overflow:hidden;box-shadow:var(--shadow-md);margin-bottom:28px}
.mission-card::before{content:"";position:absolute;right:-60px;top:-60px;width:260px;height:260px;border-radius:50%;
  background:radial-gradient(circle,rgba(204,0,0,.5),transparent 70%)}
.mc-label{position:relative;z-index:2;font-family:var(--fmono);font-size:11px;letter-spacing:2.5px;color:var(--scarlet-bright);text-transform:uppercase;margin-bottom:10px}
.mc-title{position:relative;z-index:2;font-size:24px;font-weight:700;margin-bottom:8px}
.mc-meta{position:relative;z-index:2;color:rgba(255,255,255,.7);font-size:13.5px;margin-bottom:18px}
.mission-card .btn{position:relative;z-index:2}

.section-head{margin:30px 0 14px;display:flex;align-items:center;gap:9px}
.section-head h2{font-size:18px;font-weight:700}
.section-head::after{content:"";flex:1;height:1px;background:var(--paper-3)}

.badges{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:10px}
.badge{display:flex;align-items:center;gap:10px;background:var(--paper);border:1px solid var(--paper-3);border-radius:12px;padding:12px 16px;opacity:.45;flex:1;min-width:150px}
.badge.earned{opacity:1;border-color:var(--scarlet-tint-2);background:var(--scarlet-tint)}
.badge i{font-size:22px;color:var(--gray-4)}
.badge.earned i{color:var(--scarlet)}
.badge span{font-size:13px;font-weight:600}

.arcade-row{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:760px){.arcade-row{grid-template-columns:1fr}}
.arcade-card{display:flex;flex-direction:column;align-items:center;gap:10px;background:var(--paper);border:1px solid var(--paper-3);border-radius:var(--r);padding:26px 16px;box-shadow:var(--shadow-sm);cursor:pointer;transition:transform .15s,box-shadow .15s;text-align:center}
.arcade-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md)}
.arcade-card i{font-size:34px;color:var(--scarlet)}
.arcade-card span{font-weight:600;font-size:14px}

/* ==================== HOMEWORK ==================== */
.hw-head{margin-bottom:18px}
.hw-eyebrow{font-family:var(--fmono);font-size:11px;letter-spacing:2.5px;color:var(--scarlet);text-transform:uppercase;margin-bottom:8px}
.hw-title{font-size:clamp(24px,4.5vw,32px);font-weight:700}
.hw-sub{color:var(--gray-3);font-size:14px;margin-top:6px}
.pbar-wrap{display:flex;align-items:center;gap:14px;margin-top:18px}
.pbar{flex:1;height:10px;background:var(--paper-3);border-radius:20px;overflow:hidden}
.pbar i{display:block;height:100%;background:linear-gradient(90deg,var(--scarlet),var(--scarlet-bright));border-radius:20px;width:0;transition:width .5s cubic-bezier(.2,.8,.2,1)}
.pbar-num{font-family:var(--fmono);font-size:13px;font-weight:700;color:var(--gray-2);white-space:nowrap}
.qdots{display:flex;gap:4px;flex-wrap:wrap;margin-top:14px}
.qdots i{width:9px;height:9px;border-radius:50%;background:var(--paper-3);transition:.2s;display:inline-block;cursor:pointer}
.qdots i.ok{background:var(--good)}
.qdots i.no{background:var(--scarlet)}
.qdots i.cur{background:var(--ink);transform:scale(1.35)}

.resume-banner{background:var(--ink);color:#fff;border-radius:var(--r);padding:16px 20px;display:flex;align-items:center;gap:14px;margin-bottom:16px}
.resume-banner i{color:var(--scarlet-bright);font-size:22px}

.qcard{background:var(--paper);border:1px solid var(--paper-3);border-radius:var(--r);box-shadow:var(--shadow-md);overflow:hidden;margin-top:20px}
.qc-head{background:var(--paper-2);padding:13px 22px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:6px;border-bottom:1px solid var(--paper-3)}
.qc-num{font-family:var(--fmono);font-size:12px;font-weight:700;color:var(--gray-2)}
.qc-skill{font-size:11.5px;color:#fff;background:var(--scarlet);padding:3px 11px;border-radius:20px;font-weight:700}
.qc-teks{font-family:var(--fmono);font-size:11px;color:var(--gray-3)}
.qc-body{padding:26px 24px}
.qc-prompt{font-family:var(--fmono);font-size:clamp(17px,3.3vw,22px);color:var(--ink);margin-bottom:20px;line-height:1.4;white-space:pre-line}
.qc-graph{display:block;margin:0 auto 20px;background:#fffdf9;border:1px solid var(--paper-3);border-radius:12px;max-width:340px;width:100%}

.w-row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.w-input{font-family:var(--fmono);font-size:18px;padding:12px 15px;border:2px solid var(--paper-3);border-radius:11px;background:var(--paper-2);text-align:center;width:140px;transition:.15s}
.w-input:focus{outline:none;border-color:var(--scarlet);background:#fff}
.w-input.narrow{width:96px}
.w-pairfield{display:flex;flex-direction:column;gap:5px}
.w-pairfield label{font-size:11.5px;font-weight:700;color:var(--gray-2)}
.w-select{font-family:var(--fmono);font-size:18px;padding:12px 10px;border:2px solid var(--paper-3);border-radius:11px;background:var(--paper-2);cursor:pointer}
.w-select:focus{outline:none;border-color:var(--scarlet)}
.w-mc{display:flex;flex-direction:column;gap:10px}
.w-choice{font-family:var(--fmono);font-size:16px;text-align:left;padding:14px 16px;border:2px solid var(--paper-3);border-radius:11px;background:var(--paper);cursor:pointer;transition:.12s;display:flex;align-items:center;gap:12px;width:100%}
.w-choice:hover{border-color:var(--scarlet-tint-2);background:var(--scarlet-tint)}
.w-choice.sel{border-color:var(--scarlet);background:var(--scarlet-tint)}
.w-choice .kbd{width:24px;height:24px;border-radius:6px;background:var(--paper-2);border:1px solid var(--paper-3);display:grid;place-items:center;font-family:var(--fbody);font-weight:700;font-size:12px;flex-shrink:0}
.w-choice.sel .kbd{background:var(--scarlet);color:#fff;border-color:var(--scarlet)}
.w-bool{display:flex;gap:12px}
.w-boolbtn{flex:1;font-family:var(--fdisp);font-weight:600;font-size:17px;padding:16px;border:2px solid var(--paper-3);border-radius:12px;background:var(--paper);cursor:pointer;display:flex;align-items:center;justify-content:center;gap:9px;transition:.12s}
.w-boolbtn:hover{border-color:var(--scarlet-tint-2)}
.w-boolbtn.sel{border-color:var(--scarlet);background:var(--scarlet-tint);color:var(--scarlet)}
.w-boolbtn i{font-size:20px}
.w-lock{opacity:.55;pointer-events:none}

.fb{margin-top:18px;font-weight:700;font-size:15px;display:flex;align-items:center;gap:9px;min-height:22px}
.fb.ok{color:var(--good)}.fb.no{color:var(--scarlet)}
.fb i{font-size:20px}
.reveal{margin-top:12px;background:var(--paper-2);border-left:3px solid var(--scarlet);border-radius:8px;padding:13px 16px;display:none}
.reveal.show{display:block}
.reveal .rl{font-family:var(--fmono);font-size:10px;letter-spacing:1.5px;text-transform:uppercase;color:var(--gray-4);margin-bottom:5px}
.reveal .rans{font-family:var(--fmono);font-size:15px;color:var(--good-deep);font-weight:700;margin-bottom:8px}
.reveal .rhint{font-size:13px;color:var(--gray-2)}

.qc-foot{display:flex;justify-content:space-between;align-items:center;padding:15px 22px;background:var(--paper-2);border-top:1px solid var(--paper-3);flex-wrap:wrap;gap:10px}

/* coach panel — inline AI response bubble */
.coach-panel{margin-top:14px;background:var(--paper);border:1.5px solid var(--scarlet-tint-2);border-radius:12px;padding:16px 18px;display:none}
.coach-panel.show{display:block;animation:pop .3s ease}
.coach-panel .cp-label{font-family:var(--fmono);font-size:10px;letter-spacing:1.5px;text-transform:uppercase;color:var(--scarlet);margin-bottom:8px;display:flex;align-items:center;gap:6px}
.coach-panel .cp-text{font-size:14px;color:var(--ink);line-height:1.55;white-space:pre-line}
.coach-panel .cp-loading{color:var(--gray-3);font-size:13px;display:flex;align-items:center;gap:8px}
.coach-btn-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}

/* ==================== SUMMARY ==================== */
.summary{background:var(--paper);border:1px solid var(--paper-3);border-radius:var(--r-lg);box-shadow:var(--shadow-md);padding:40px 32px;text-align:center;margin-top:30px;display:none}
.summary.show{display:block;animation:pop .4s cubic-bezier(.2,.8,.2,1)}
@keyframes pop{from{opacity:0;transform:scale(.96)}to{opacity:1;transform:none}}
.sum-ring-wrap{position:relative;width:150px;height:150px;margin:0 auto 8px}
.sum-ring-svg{transform:rotate(-90deg)}
.sum-ring-inner{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center}
.sum-pct{font-family:var(--fdisp);font-weight:700;font-size:40px;line-height:1}
.sum-label{font-size:12px;color:var(--gray-3);margin-top:2px}
.sum-head{font-size:28px;margin-bottom:8px}
.sum-msg{color:var(--gray-3);font-size:15px;margin-bottom:24px}
.sum-stats{display:flex;justify-content:center;gap:14px;margin-bottom:26px;flex-wrap:wrap}
.ss{background:var(--paper-2);border:1px solid var(--paper-3);border-radius:12px;padding:14px 22px;min-width:110px;font-size:11.5px;color:var(--gray-3);font-weight:600}
.ss span{font-family:var(--fdisp);font-weight:700;font-size:26px;display:block;color:var(--ink)}
.sum-break{text-align:left;background:var(--paper-2);border-radius:12px;padding:18px 20px;margin-bottom:24px}
.sbrow{display:flex;align-items:center;justify-content:space-between;padding:7px 0;border-bottom:1px dashed var(--paper-3);font-size:13.5px}
.sbrow:last-child{border-bottom:none}
.sbrow .sk{display:flex;align-items:center;gap:8px}
.sbrow .sk i{font-size:15px}
.sbrow .sv{font-family:var(--fmono);font-weight:700;font-size:13px}
.sbrow.good .sk i{color:var(--good)} .sbrow.bad .sk i{color:var(--scarlet)}
.sactions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

.toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%) translateY(120px);background:var(--ink);color:#fff;padding:12px 20px;border-radius:12px;font-size:13px;font-weight:600;box-shadow:var(--shadow-md);z-index:200;display:flex;align-items:center;gap:9px;transition:transform .3s}
.toast.show{transform:translateX(-50%) translateY(0)}
.toast i{color:var(--good)}

/* ==================== PRACTICE ARCADE ==================== */
.arcade-header{margin-bottom:18px}
.arcade-sub{color:var(--gray-3);font-size:14px;margin-top:6px}
.arcade-tabs{display:flex;gap:8px;margin-bottom:20px;flex-wrap:wrap}
.arc-tab{font-family:var(--fbody);font-weight:600;font-size:13.5px;color:var(--gray-3);background:var(--paper);border:1px solid var(--paper-3);
  padding:10px 16px;border-radius:10px;cursor:pointer;display:flex;align-items:center;gap:7px;transition:.15s}
.arc-tab:hover{border-color:var(--scarlet-tint-2)}
.arc-tab.on{color:#fff;background:var(--scarlet);border-color:var(--scarlet)}
.game-panel{}
.game-header{display:flex;justify-content:flex-end;margin-bottom:8px}
.game-score{font-family:var(--fmono);font-size:13px;font-weight:700;color:var(--gray-2);background:var(--paper);border:1px solid var(--paper-3);border-radius:20px;padding:6px 14px}

/* ==================== STUDY GUIDE ==================== */
.week-tabs{display:flex;gap:8px;margin-bottom:22px}
.week-tab{font-weight:600;font-size:13.5px;color:var(--gray-3);background:var(--paper);border:1px solid var(--paper-3);padding:10px 18px;border-radius:10px;cursor:pointer}
.week-tab.on{color:#fff;background:var(--scarlet);border-color:var(--scarlet)}
.study-loading{color:var(--gray-3);display:flex;align-items:center;gap:10px;padding:40px 0;justify-content:center;font-size:14px}
.study-big-idea{background:var(--ink);color:#fff;border-radius:var(--r-lg);padding:28px 30px;margin-bottom:26px;position:relative;overflow:hidden}
.study-big-idea::before{content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;background:radial-gradient(circle,rgba(204,0,0,.5),transparent 70%)}
.sbi-eyebrow{position:relative;z-index:2;font-family:var(--fmono);font-size:11px;letter-spacing:2.5px;color:var(--scarlet-bright);text-transform:uppercase;margin-bottom:10px}
.sbi-title{position:relative;z-index:2;font-size:22px;font-weight:700;margin-bottom:10px}
.sbi-analogy{position:relative;z-index:2;color:rgba(255,255,255,.75);font-size:14px;max-width:60ch}
.study-section{margin-bottom:28px}
.study-section h3{font-size:16px;font-weight:700;margin-bottom:14px}
.formula-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(max-width:640px){.formula-grid{grid-template-columns:1fr}}
.formula-card{background:var(--paper);border:1px solid var(--paper-3);border-radius:12px;padding:16px 18px;box-shadow:var(--shadow-sm)}
.fc-name{font-size:12.5px;font-weight:700;color:var(--gray-2);margin-bottom:6px}
.fc-eq{font-size:16px;color:var(--scarlet);font-weight:700;margin-bottom:4px}
.fc-note{font-size:12px;color:var(--gray-3)}
.example-card{background:var(--paper);border:1px solid var(--paper-3);border-radius:12px;padding:18px 20px;margin-bottom:12px;box-shadow:var(--shadow-sm)}
.ex-num{font-family:var(--fmono);font-size:10.5px;letter-spacing:1.5px;text-transform:uppercase;color:var(--gray-4);margin-bottom:8px}
.ex-problem{font-size:17px;margin-bottom:10px}
.ex-steps{margin-bottom:10px}
.ex-step{font-size:13.5px;color:var(--gray-2);padding:4px 0}
.ex-answer{font-size:14px;color:var(--good-deep);font-weight:600}
.mistakes-list{display:flex;flex-direction:column;gap:12px}
.mistake-card{background:var(--paper);border:1px solid var(--paper-3);border-radius:12px;padding:16px 18px;box-shadow:var(--shadow-sm)}
.m-wrong,.m-right{font-size:14px;margin-bottom:6px}
.m-label{font-weight:700;font-size:12px;padding:2px 8px;border-radius:6px;margin-right:6px}
.m-label.no{background:var(--scarlet-tint);color:var(--scarlet-deep)}
.m-label.ok{background:var(--good-tint);color:var(--good-deep)}
.m-why{font-size:13px;color:var(--gray-3);margin-top:6px}

/* ==================== TEACHER / COACH SHELL ==================== */
.teacher-body{background:var(--paper-2)}
.t-layout{display:grid;grid-template-columns:230px 1fr;min-height:100vh}
@media(max-width:820px){.t-layout{grid-template-columns:1fr}}
.tside{background:var(--ink);color:#fff;padding:24px 18px;position:sticky;top:0;height:100vh}
@media(max-width:820px){.tside{position:static;height:auto}}
.ts-brand{display:flex;align-items:center;gap:12px;margin-bottom:30px}
.ts-brand .glyph{width:38px;height:38px;border-radius:10px;background:linear-gradient(145deg,var(--scarlet-bright),var(--scarlet-deep));display:grid;place-items:center;font-family:var(--fdisp);font-weight:700;font-size:19px}
.ts-brand .bm-t{font-family:var(--fdisp);font-weight:700;font-size:16px}
.ts-brand .bm-s{font-family:var(--fmono);font-size:9px;letter-spacing:2px;color:var(--gray-4);text-transform:uppercase;margin-top:2px}
.ts-student-card{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.09);border-radius:12px;padding:14px;margin-bottom:20px}
.ts-sc-label{font-family:var(--fmono);font-size:9.5px;letter-spacing:1.5px;color:rgba(255,255,255,.45);text-transform:uppercase;margin-bottom:6px}
.ts-sc-name{font-family:var(--fdisp);font-weight:600;font-size:16px}
.ts-live{display:flex;align-items:center;gap:6px;font-size:11px;color:rgba(255,255,255,.6);margin-top:10px;transition:background .3s;border-radius:6px;padding:2px 4px}
.live-dot{width:7px;height:7px;border-radius:50%;background:var(--good);box-shadow:0 0 0 4px rgba(31,157,99,.2);display:inline-block}
.ts-nav{display:flex;flex-direction:column;gap:3px}
.tsn{display:flex;align-items:center;gap:12px;font-weight:600;font-size:13.5px;color:rgba(255,255,255,.62);padding:11px 13px;border-radius:10px;transition:.15s;background:none;border:none;width:100%;cursor:pointer;text-align:left}
.tsn i{font-size:18px}
.tsn:hover{color:#fff;background:rgba(255,255,255,.06)}
.tsn.on{color:#fff;background:var(--scarlet)}
.tsn-logout{margin-top:8px}

.t-main{padding:30px 32px 80px}
@media(max-width:520px){.t-main{padding:24px 18px}}
.t-header{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:24px;flex-wrap:wrap}
.t-header h1{font-size:clamp(24px,4vw,34px);font-weight:700}
.t-header-sub{color:var(--gray-3);font-size:13.5px;margin-top:6px}

.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:24px}
@media(max-width:820px){.stat-grid{grid-template-columns:repeat(2,1fr)}}
.stat-card{background:var(--paper);border:1px solid var(--paper-3);border-radius:var(--r);padding:20px;box-shadow:var(--shadow-sm)}
.sc-val{font-family:var(--fdisp);font-weight:700;font-size:32px;line-height:1;color:var(--ink)}
.sc-lab{font-size:12.5px;color:var(--gray-3);margin-top:6px;font-weight:600}

.t-section{background:var(--paper);border:1px solid var(--paper-3);border-radius:var(--r);padding:22px 24px;box-shadow:var(--shadow-sm);margin-bottom:18px}
.t-section h2{font-size:16px;font-weight:700;margin-bottom:16px;display:flex;align-items:center;gap:10px}
.t-empty{color:var(--gray-4);font-size:13.5px;padding:20px 0;text-align:center}

.skill-list{display:flex;flex-direction:column;gap:14px}
.skill-row{display:grid;grid-template-columns:1fr 2fr auto;gap:10px;align-items:center}
@media(max-width:600px){.skill-row{grid-template-columns:1fr}}
.skill-name{font-size:13.5px;font-weight:600}
.skill-bar{height:9px;background:var(--paper-2);border-radius:20px;overflow:hidden}
.skill-fill{display:block;height:100%;border-radius:20px}
.skill-hi{background:linear-gradient(90deg,var(--good),#2bb877)}
.skill-mid{background:linear-gradient(90deg,var(--warn),#F2C230)}
.skill-lo{background:linear-gradient(90deg,var(--scarlet-deep),var(--scarlet))}
.skill-pct{font-family:var(--fmono);font-size:12px;font-weight:700;color:var(--gray-2);white-space:nowrap}

.heatmap{display:flex;flex-direction:column;gap:10px}
.hm-week{display:flex;align-items:center;gap:6px}
.hm-wlabel{font-family:var(--fmono);font-size:11px;font-weight:700;color:var(--gray-2);width:34px;flex-shrink:0}
.hm-cell{flex:1;aspect-ratio:1;max-width:52px;border-radius:8px;display:grid;place-items:center;font-family:var(--fmono);font-size:11px;font-weight:700;background:var(--paper-2);color:var(--gray-4);border:1px solid var(--paper-3)}
.hm-cell[data-intensity="1"]{background:var(--scarlet-tint-2);color:var(--scarlet-deep);border-color:transparent}
.hm-cell[data-intensity="2"]{background:#EF8A93;color:#fff;border-color:transparent}
.hm-cell[data-intensity="3"]{background:var(--scarlet);color:#fff;border-color:transparent}
.hm-cell[data-intensity="4"],.hm-cell[data-intensity="5"]{background:var(--scarlet-deep);color:#fff;border-color:transparent}

.feed{display:flex;flex-direction:column}
.feed-item{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px dashed var(--paper-3);font-size:13px}
.feed-item:last-child{border-bottom:none}
.feed-item i{font-size:18px;flex-shrink:0}
.feed-item.ok i{color:var(--good)}
.feed-item.no i{color:var(--scarlet)}
.fi-id{color:var(--gray-4);font-size:11px}
.fi-skill{flex:1}
.fi-time{color:var(--gray-4);font-family:var(--fmono);font-size:10.5px;white-space:nowrap}

.live-pill{font-family:var(--fmono);font-size:9.5px;letter-spacing:1.5px;background:var(--good-tint);color:var(--good-deep);padding:3px 9px;border-radius:20px;font-weight:700}

.trend-grid{display:flex;flex-direction:column;gap:16px}
.trend-week{}
.tw-label{font-family:var(--fmono);font-size:11px;font-weight:700;color:var(--gray-2);margin-bottom:8px}
.trend-row{display:grid;grid-template-columns:70px 1fr 50px;align-items:center;gap:10px;margin-bottom:6px}
.trend-label{font-family:var(--fmono);font-size:11px;color:var(--gray-3)}
.trend-bar{height:8px;background:var(--paper-2);border-radius:20px;overflow:hidden}
.trend-fill{display:block;height:100%;background:linear-gradient(90deg,var(--scarlet),var(--scarlet-bright));border-radius:20px}
.trend-pct{font-family:var(--fmono);font-size:11.5px;font-weight:700;color:var(--gray-2);text-align:right}

/* ==================== QUESTION BANK ==================== */
.qb-filters{display:flex;gap:10px}
.qb-filters select{font-family:var(--fbody);font-weight:600;font-size:13px;padding:9px 12px;border:1.5px solid var(--paper-3);border-radius:10px;background:var(--paper);cursor:pointer}
.qb-list{display:flex;flex-direction:column;gap:14px}
.qb-card{background:var(--paper);border:1px solid var(--paper-3);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow-sm)}
.qb-head{background:var(--paper-2);padding:12px 18px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;border-bottom:1px solid var(--paper-3)}
.qb-head .qc-num{font-family:var(--fmono);font-size:11.5px;color:var(--gray-2);font-weight:700}
.qb-body{padding:18px 20px}
.qb-prompt{font-size:16px;margin-bottom:16px;white-space:pre-line}
.qb-meta-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:14px;margin-bottom:14px}
@media(max-width:700px){.qb-meta-row{grid-template-columns:1fr}}
.qb-meta-col{}
.qb-label{font-family:var(--fmono);font-size:10px;letter-spacing:1.5px;text-transform:uppercase;color:var(--gray-4);margin-bottom:5px}
.good-text{color:var(--good-deep);font-weight:700}
.qb-work{font-size:13px;color:var(--gray-2);white-space:pre-line}
.qb-hint{font-size:13px;color:var(--gray-2)}
.qb-student-ans{padding:11px 14px;border-radius:9px;font-size:12.5px;display:flex;align-items:center;gap:9px;font-weight:600}
.qb-student-ans.ok{background:var(--good-tint);color:var(--good-deep)}
.qb-student-ans.no{background:var(--scarlet-tint);color:var(--scarlet-deep)}
.qb-student-ans.unanswered{background:var(--paper-2);color:var(--gray-4)}
.qb-student-ans i{font-size:17px}