:root {
  --cream: #f9f2e2;
  --cream-deep: #efe4ca;
  --card: #fffaf0;
  --navy: #141b34;
  --navy-soft: #3a4258;
  --navy-mute: #6b7088;
  --gold: #d8a249;
  --gold-deep: #a8782c;
  --gold-tint: #f6e7c8;
  --rule: #e3d6ba;
  --good: #2f6b4a;
  --good-tint: #e4efe6;
  --bad: #a8402e;
  --bad-tint: #f6e3dd;
  --cs: #4f8a6b;
  --ps: #d8a249;
  --dwl: #b5523b;
  --gov: #6b7fa8;
  --shadow: 0 1px 2px rgba(20,27,52,.05), 0 8px 24px rgba(20,27,52,.07);
  --radius: 8px;
  --serif: 'Fraunces', Georgia, serif;
  --sans: 'Inter', system-ui, -apple-system, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body { background: var(--cream); color: var(--navy); font-family: var(--sans); font-size: 16px; line-height: 1.55; }
button { font-family: inherit; }
a { color: var(--navy); }
:focus-visible { outline: 2px solid var(--gold-deep); outline-offset: 2px; }
h1[tabindex]:focus { outline: none; }

/* ---------- Header ---------- */
.top { position: sticky; top: 0; z-index: 30; display: flex; align-items: center; gap: 18px; padding: 10px 24px; background: var(--cream); border-bottom: 1px solid var(--rule); }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand-rex { height: 46px; width: auto; }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.wordmark { font-family: var(--serif); font-weight: 700; font-size: 22px; letter-spacing: -0.01em; }
.navy { color: var(--navy); } .gold { color: var(--gold); }
.tagline { font-family: var(--mono); font-size: 9.5px; letter-spacing: .22em; text-transform: uppercase; color: var(--navy-mute); margin-top: 3px; }
.top-title { font-family: var(--mono); font-size: 12px; letter-spacing: .16em; text-transform: uppercase; color: var(--gold-deep); padding-left: 18px; border-left: 1px solid var(--rule); }
.back-home { margin-left: auto; font-family: var(--mono); font-size: 12px; letter-spacing: .1em; text-transform: uppercase; text-decoration: none; color: var(--navy-soft); }
.back-home:hover { color: var(--gold-deep); }
.menu-btn { display: none; background: none; border: 1px solid var(--rule); border-radius: 6px; width: 40px; height: 36px; padding: 8px; cursor: pointer; flex-direction: column; justify-content: space-between; }
.menu-btn span { display: block; height: 2px; background: var(--navy); border-radius: 2px; }

/* ---------- Layout ---------- */
.layout { display: grid; grid-template-columns: 236px 1fr; min-height: calc(100vh - 67px); }
.sidebar { border-right: 1px solid var(--rule); padding: 20px 14px 40px; position: sticky; top: 67px; height: calc(100vh - 67px); overflow-y: auto; }
.sidebar a { display: block; padding: 7px 12px; border-radius: 6px; text-decoration: none; font-size: 14.5px; color: var(--navy-soft); }
.sidebar a:hover { background: var(--cream-deep); color: var(--navy); }
.sidebar a.active { background: var(--navy); color: var(--cream); }
.nav-group { font-family: var(--mono); font-size: 10.5px; letter-spacing: .16em; text-transform: uppercase; color: var(--gold-deep); margin: 20px 12px 6px; }
main { padding: 32px 40px 72px; min-width: 0; outline: none; }
.view { max-width: 960px; }
.tutor-view { max-width: none; }

/* ---------- Type ---------- */
.eyebrow { font-family: var(--mono); font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--gold-deep); margin-bottom: 8px; }
.display { font-family: var(--serif); font-weight: 700; font-size: clamp(30px, 4.4vw, 46px); line-height: 1.08; letter-spacing: -0.015em; margin: 0 0 28px; }
.view-title { font-family: var(--serif); font-weight: 700; font-size: clamp(28px, 3.6vw, 38px); line-height: 1.1; margin: 0 0 8px; }
.view-lead { color: var(--navy-soft); font-size: 17px; margin: 0 0 24px; max-width: 680px; }
.card { background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.card-title { font-family: var(--serif); font-weight: 700; font-size: 24px; margin: 0 0 12px; }
.lbl { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--navy-mute); margin: 18px 0 10px; display: flex; gap: 12px; align-items: center; }
.lbl:first-child { margin-top: 0; }
.lbl-inline { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--navy-mute); }
.mini { background: none; border: none; padding: 0; font-family: var(--sans); text-transform: none; letter-spacing: 0; font-size: 13px; color: var(--gold-deep); cursor: pointer; }
.mini:hover { text-decoration: underline; }

/* ---------- Buttons ---------- */
.gold-btn { background: var(--navy); color: var(--cream); border: none; border-radius: 6px; padding: 11px 20px; font-weight: 600; font-size: 15px; cursor: pointer; transition: background .15s, transform .05s; }
.gold-btn:hover { background: #26304f; }
.gold-btn:active { transform: translateY(1px); }
.gold-btn:disabled { background: #b9b4a6; cursor: default; }
.navy-btn { background: var(--gold); color: var(--navy); border: none; border-radius: 20px; padding: 7px 14px; font-size: 13px; font-weight: 600; cursor: pointer; }
.navy-btn:hover { background: #e4b25e; }
.ghost-btn { background: transparent; border: 1px solid var(--rule); color: var(--navy-soft); border-radius: 20px; padding: 7px 14px; font-size: 13px; cursor: pointer; }
.ghost-btn:hover { border-color: var(--gold); background: var(--gold-tint); color: var(--navy); }
.link-btn { background: none; border: none; color: var(--navy-mute); font-size: 13px; cursor: pointer; padding: 0; }
.link-btn:hover { color: var(--bad); text-decoration: underline; }
.row-end { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; flex-wrap: wrap; }
.pill { font-family: var(--mono); font-size: 12px; background: var(--cream-deep); border-radius: 20px; padding: 4px 11px; color: var(--navy-soft); white-space: nowrap; }
.pill.streak.hot { background: var(--gold); color: var(--navy); }

/* ---------- Home ---------- */
.entry-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 14px; margin-bottom: 28px; }
.entry { text-align: left; background: var(--card); border: 1px solid var(--rule); border-top: 3px solid var(--gold); border-radius: var(--radius); padding: 18px 18px 16px; cursor: pointer; transition: transform .15s, box-shadow .15s; }
.entry:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.entry .e-tag { font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--gold-deep); }
.entry .e-title { font-family: var(--serif); font-weight: 700; font-size: 20px; margin: 4px 0 4px; color: var(--navy); line-height: 1.2; }
.entry .e-sub { font-size: 14px; color: var(--navy-soft); }
.home-progress h2 { font-family: var(--serif); font-size: 20px; margin: 0 0 4px; }
.home-progress .muted { color: var(--navy-mute); font-size: 14px; margin: 0 0 14px; }

/* ---------- Progress bars ---------- */
.ubars { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 10px 22px; }
.ubar { font-size: 13.5px; }
.ubar .ub-top { display: flex; justify-content: space-between; gap: 8px; margin-bottom: 4px; color: var(--navy-soft); }
.ubar .ub-top b { color: var(--navy); font-weight: 600; }
.ubar .track { height: 7px; background: var(--cream-deep); border-radius: 4px; overflow: hidden; }
.ubar .track div { height: 100%; background: var(--gold); border-radius: 4px; }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 16px 0; }
.stat { background: var(--cream); border: 1px solid var(--rule); border-radius: 8px; padding: 14px; text-align: center; }
.stat .num { font-family: var(--serif); font-size: 28px; font-weight: 700; }
.stat .cap { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--navy-mute); }

/* ---------- Tutor ---------- */
.tutor-layout { display: grid; grid-template-columns: 270px 1fr; gap: 0; background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius); box-shadow: var(--shadow); height: calc(100vh - 67px - 64px); min-height: 520px; overflow: hidden; }
.unit-panel { border-right: 1px solid var(--rule); padding: 18px 14px; overflow-y: auto; background: var(--cream); }
.panel-label { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--navy-mute); margin-bottom: 10px; }
.unit-list { display: flex; flex-direction: column; gap: 6px; }
.unit-btn, .router-btn { text-align: left; background: var(--card); border: 1px solid var(--rule); border-radius: 7px; padding: 8px 11px; cursor: pointer; font-size: 13.5px; color: var(--navy); line-height: 1.25; transition: border-color .15s, background .15s; width: 100%; }
.router-btn { border-style: dashed; border-color: var(--gold); margin-bottom: 10px; }
.unit-btn:hover, .router-btn:hover { border-color: var(--gold); background: var(--gold-tint); }
.unit-btn[aria-pressed="true"], .router-btn[aria-pressed="true"] { background: var(--navy); border-color: var(--navy); color: var(--cream); }
.u-tag { font-family: var(--mono); font-size: 10.5px; color: var(--gold-deep); display: block; margin-bottom: 1px; }
[aria-pressed="true"] .u-tag { color: var(--gold); }
.chat-wrap { display: flex; flex-direction: column; min-height: 0; min-width: 0; }
.chat-head { padding: 14px 22px; border-bottom: 1px solid var(--rule); display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.chat-now { font-family: var(--serif); font-weight: 700; font-size: 19px; }
.chat-rule { font-size: 12.5px; color: var(--navy-mute); }
.chat-rule strong { color: var(--gold-deep); }
.statusbar { padding: 6px 22px; border-bottom: 1px solid var(--rule); background: var(--cream); font-size: 12.5px; color: var(--navy-soft); }
.log { flex: 1; overflow-y: auto; padding: 20px 22px 8px; display: flex; flex-direction: column; gap: 14px; }
.msg { max-width: 78%; }
.msg .who { font-family: var(--mono); font-size: 10px; letter-spacing: .12em; text-transform: uppercase; color: var(--navy-mute); margin-bottom: 4px; }
.bubble { padding: 11px 14px; border-radius: 10px; font-size: 15px; line-height: 1.55; white-space: pre-wrap; overflow-wrap: anywhere; }
.msg.tutor { align-self: flex-start; }
.msg.tutor .bubble { background: #fff; border: 1px solid var(--rule); border-top-left-radius: 3px; }
.msg.student { align-self: flex-end; }
.msg.student .who { text-align: right; color: var(--gold-deep); }
.msg.student .bubble { background: var(--gold-tint); border: 1px solid #ecd6a8; border-top-right-radius: 3px; }
.bubble.summary { border-left: 3px solid var(--navy) !important; background: var(--cream) !important; }
.typing .bubble { color: var(--navy-mute); }
.dot { display: inline-block; animation: blink 1.2s infinite; }
.dot:nth-child(2) { animation-delay: .2s; } .dot:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%,60%,100% { opacity: .25; } 30% { opacity: 1; } }
.empty { margin: auto; max-width: 560px; padding: 20px; text-align: center; }
.empty .big { font-family: var(--serif); font-weight: 700; font-size: 28px; margin-bottom: 8px; }
.empty p { color: var(--navy-soft); margin: 0 0 10px; }
.examples { display: flex; flex-direction: column; gap: 8px; margin-top: 14px; text-align: left; }
.ex-btn { text-align: left; background: #fff; border: 1px solid var(--rule); border-radius: 8px; padding: 10px 12px; font-size: 14px; color: var(--navy); cursor: pointer; }
.ex-btn:hover { border-color: var(--gold); background: var(--gold-tint); }
.ex-tag { font-family: var(--mono); font-size: 10px; color: var(--gold-deep); text-transform: uppercase; letter-spacing: .1em; display: block; margin-bottom: 2px; }
.modebar { padding: 10px 22px; border-top: 1px solid var(--rule); display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.modegroup { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.mlabel { font-family: var(--mono); font-size: 10px; letter-spacing: .14em; text-transform: uppercase; color: var(--navy-mute); }
.modes { display: flex; gap: 6px; flex-wrap: wrap; }
.mode-pill { background: #fff; border: 1px solid var(--rule); border-radius: 20px; padding: 5px 11px; font-size: 12.5px; color: var(--navy-soft); cursor: pointer; }
.mode-pill:hover { border-color: var(--gold); background: var(--gold-tint); }
.mode-pill[aria-pressed="true"] { background: var(--navy); border-color: var(--navy); color: var(--cream); }
.modenote { font-size: 12.5px; color: var(--navy-mute); font-style: italic; }
.modebar-right { margin-left: auto; display: flex; gap: 8px; }
.composer { padding: 10px 22px 6px; display: flex; gap: 10px; align-items: flex-end; }
#chatInput { flex: 1; min-height: 46px; max-height: 160px; resize: none; border: 1px solid var(--rule); border-radius: 8px; padding: 12px 14px; font-family: inherit; font-size: 15px; color: var(--navy); background: #fff; }
#chatInput:focus { outline: 2px solid var(--gold); outline-offset: 0; }
#sendBtn { height: 46px; }
.fineprint { padding: 4px 22px 14px; font-size: 11.5px; color: var(--navy-mute); }

/* ---------- Practice ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { background: var(--cream); border: 1px solid var(--rule); border-radius: 20px; padding: 7px 13px; font-size: 13px; color: var(--navy-soft); cursor: pointer; }
.chip:hover { border-color: var(--gold); }
.chip[aria-pressed="true"] { background: var(--navy); border-color: var(--navy); color: var(--cream); }
.chip .ct { font-family: var(--mono); font-size: 10px; color: var(--gold-deep); margin-right: 6px; }
.chip[aria-pressed="true"] .ct { color: var(--gold); }
.avail { font-size: 13px; color: var(--navy-mute); margin-top: 14px; }
.scorebar { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.prog { font-family: var(--mono); font-size: 12px; color: var(--navy-mute); }
.level { flex: 1; min-width: 170px; }
.llabel { font-size: 12px; color: var(--navy-soft); margin-bottom: 4px; display: flex; justify-content: space-between; }
.llabel b { color: var(--navy); }
.meter { height: 8px; background: var(--cream-deep); border-radius: 5px; overflow: hidden; }
.meter .fill { height: 100%; width: 30%; background: linear-gradient(90deg, #e9c27a, var(--gold-deep)); border-radius: 5px; transition: width .4s ease; }
.q-card { position: relative; padding-right: 96px; }
.qmeta { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.qtag { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--gold-deep); }
.diff { font-family: var(--mono); font-size: 12px; color: var(--gold); letter-spacing: 2px; }
.diff .d-label { color: var(--navy-mute); letter-spacing: 0; font-size: 10.5px; margin-left: 4px; text-transform: uppercase; }
.qprompt { font-size: 17.5px; line-height: 1.5; margin-bottom: 16px; white-space: pre-wrap; }
.opts { display: flex; flex-direction: column; gap: 8px; }
.opt { text-align: left; background: #fff; border: 1px solid var(--rule); border-radius: 8px; padding: 11px 14px; font-size: 15px; color: var(--navy); cursor: pointer; transition: border-color .12s, background .12s; }
.opt:hover { border-color: var(--gold); }
.opt[aria-pressed="true"] { border-color: var(--navy); background: var(--gold-tint); }
.opt.correct { border-color: var(--good); background: var(--good-tint); }
.opt.wrong { border-color: var(--bad); background: var(--bad-tint); }
.opt.locked { cursor: default; }
.numrow { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.numrow input { width: 170px; border: 1px solid var(--rule); border-radius: 8px; padding: 11px 12px; font-family: inherit; font-size: 15px; background: #fff; }
.qactions { display: flex; gap: 8px; align-items: center; margin-top: 18px; flex-wrap: wrap; }
.hintbox { margin-top: 14px; border-left: 3px solid var(--gold); background: var(--gold-tint); border-radius: 0 8px 8px 0; padding: 11px 14px; font-size: 14.5px; white-space: pre-wrap; }
.hintbox .h-who { font-family: var(--mono); font-size: 10px; letter-spacing: .12em; text-transform: uppercase; color: var(--gold-deep); margin-bottom: 4px; }
.feedback { margin-top: 16px; border-radius: 8px; padding: 13px 16px; font-size: 15px; }
.feedback.ok { background: var(--good-tint); border: 1px solid #c9dfd0; }
.feedback.no { background: var(--bad-tint); border: 1px solid #ecc9bf; }
.feedback .verdict { font-weight: 600; margin-bottom: 4px; }
.feedback.ok .verdict { color: var(--good); }
.feedback.no .verdict { color: var(--bad); }
.feedback .after { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
table.byunit { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 14px; }
table.byunit th { text-align: left; font-family: var(--mono); font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--navy-mute); padding: 6px 8px; border-bottom: 1px solid var(--rule); }
table.byunit td { padding: 8px; border-bottom: 1px solid var(--rule); }
.review { margin-top: 16px; background: var(--cream); border-left: 3px solid var(--navy); border-radius: 0 8px 8px 0; padding: 12px 15px; font-size: 14.5px; }

/* ---------- Dino ---------- */
.dino-perch { position: absolute; right: 14px; top: 14px; width: 70px; height: 84px; pointer-events: none; }
.dino-perch img { width: 70px; height: auto; transform-origin: bottom center; }
.flame { position: absolute; left: 0; top: 16px; font-size: 22px; opacity: 0; }
.dino-perch.breathe img { animation: rexshake .6s ease; }
.dino-perch.breathe .f1 { animation: flame 1s ease-out .05s; }
.dino-perch.breathe .f2 { animation: flame 1s ease-out .2s; }
.dino-perch.breathe .f3 { animation: flame 1s ease-out .35s; }
.dino-perch.cheer img { animation: rexhop .5s ease; }
@keyframes flame { 0% { opacity: 0; transform: translate(0,0) scale(.4); } 15% { opacity: 1; } 100% { opacity: 0; transform: translate(-90px, 10px) scale(1.5); } }
@keyframes rexshake { 0%,100% { transform: rotate(0); } 25% { transform: rotate(-8deg); } 60% { transform: rotate(5deg); } }
@keyframes rexhop { 0%,100% { transform: translateY(0); } 40% { transform: translateY(-12px); } }

/* ---------- Flaws / explain ---------- */
.filter-row { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
select { max-width: 100%; font-family: inherit; font-size: 14px; padding: 7px 10px; border: 1px solid var(--rule); border-radius: 6px; background: #fff; color: var(--navy); }
.statement { font-family: var(--serif); font-size: 21px; line-height: 1.4; margin: 6px 0 18px; padding: 16px 18px; background: var(--cream); border-left: 3px solid var(--gold); border-radius: 0 8px 8px 0; }
.statement .who-said { display: block; font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--navy-mute); margin-bottom: 6px; }
.q-ask { font-weight: 600; margin-bottom: 10px; }
textarea.answer-box { width: 100%; min-height: 120px; resize: vertical; border: 1px solid var(--rule); border-radius: 8px; padding: 12px 14px; font-family: inherit; font-size: 15px; background: #fff; color: var(--navy); }
textarea.answer-box:focus { outline: 2px solid var(--gold); outline-offset: 0; }
.strong-answer { margin-top: 14px; background: var(--cream); border-left: 3px solid var(--navy); border-radius: 0 8px 8px 0; padding: 12px 15px; font-size: 14.5px; }
.strong-answer .h-who { font-family: var(--mono); font-size: 10px; letter-spacing: .12em; text-transform: uppercase; color: var(--navy-mute); margin-bottom: 4px; }

/* ---------- Exam prep ---------- */
.status { font-family: var(--mono); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; border-radius: 20px; padding: 3px 9px; white-space: nowrap; }
.status.none { background: var(--cream-deep); color: var(--navy-mute); }
.status.weak { background: var(--bad-tint); color: var(--bad); }
.status.mid { background: var(--gold-tint); color: var(--gold-deep); }
.status.solid { background: var(--good-tint); color: var(--good); }
.plan { list-style: none; counter-reset: step; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.plan li { counter-increment: step; display: grid; grid-template-columns: 34px 1fr; gap: 12px; align-items: start; }
.plan li::before { content: counter(step); font-family: var(--serif); font-weight: 700; font-size: 18px; width: 34px; height: 34px; border-radius: 50%; background: var(--navy); color: var(--cream); display: flex; align-items: center; justify-content: center; }
.plan .p-title { font-weight: 600; margin-bottom: 4px; }
.plan .p-sub { font-size: 14px; color: var(--navy-soft); margin-bottom: 8px; }
.concept-row { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--rule); font-size: 14.5px; flex-wrap: wrap; }
.concept-row:last-child { border-bottom: none; }
.concept-row .cr-unit { font-family: var(--mono); font-size: 10.5px; color: var(--gold-deep); text-transform: uppercase; letter-spacing: .08em; display: block; }
.ready-steps { font-family: var(--mono); font-size: 12px; color: var(--navy-mute); margin-bottom: 10px; }
.review-item { border-top: 1px solid var(--rule); padding: 12px 0; font-size: 14.5px; }
.review-item .ri-q { font-weight: 600; margin-bottom: 4px; }
.review-item .ri-res.ok { color: var(--good); font-weight: 600; }
.review-item .ri-res.no { color: var(--bad); font-weight: 600; }
.exam-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 18px; align-items: start; }
@media (max-width: 1000px) { .exam-grid { grid-template-columns: 1fr; } }

/* ---------- See it ---------- */
.see-grid { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(260px, 1fr); gap: 20px; align-items: start; }
.graph-card { padding: 14px; }
.graph-card svg { width: 100%; height: auto; display: block; }
.controls { display: flex; flex-direction: column; gap: 16px; }
.ctrl label { display: flex; justify-content: space-between; font-size: 13.5px; color: var(--navy-soft); margin-bottom: 4px; }
.ctrl label b { font-family: var(--mono); color: var(--navy); font-weight: 500; }
input[type=range] { width: 100%; accent-color: var(--gold-deep); }
.seg { display: flex; flex-wrap: wrap; gap: 6px; }
.seg button { background: #fff; border: 1px solid var(--rule); border-radius: 20px; padding: 6px 12px; font-size: 13px; color: var(--navy-soft); cursor: pointer; }
.seg button:hover { border-color: var(--gold); }
.seg button[aria-pressed="true"] { background: var(--navy); color: var(--cream); border-color: var(--navy); }
.readout { background: var(--cream); border: 1px solid var(--rule); border-radius: 8px; padding: 12px 14px; font-size: 14px; }
.readout table { width: 100%; border-collapse: collapse; }
.readout td { padding: 3px 0; }
.readout td:last-child { text-align: right; font-family: var(--mono); }
.readout .sw { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; vertical-align: middle; }
.verdict-box { border-radius: 8px; padding: 12px 14px; font-size: 14.5px; background: var(--gold-tint); border-left: 3px solid var(--gold); }
.predict { background: #fff; border: 1px dashed var(--gold); border-radius: 8px; padding: 14px; }
.predict .p-q { font-weight: 600; margin-bottom: 8px; }
.predict .p-res { margin-top: 10px; font-size: 14.5px; }
.events { display: flex; flex-wrap: wrap; gap: 6px; }
.event-btn { background: #fff; border: 1px solid var(--rule); border-radius: 8px; padding: 8px 11px; font-size: 13.5px; color: var(--navy); cursor: pointer; text-align: left; }
.event-btn:hover { border-color: var(--gold); background: var(--gold-tint); }
.event-btn[aria-pressed="true"] { border-color: var(--navy); background: var(--gold-tint); }
.see-note { font-size: 13.5px; color: var(--navy-mute); margin-top: 10px; }
.svg-label { font-family: var(--sans); font-size: 13px; fill: var(--navy); }
.svg-axis { font-family: var(--mono); font-size: 11px; fill: var(--navy-mute); }

/* ---------- Tools ---------- */
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.tool-link { display: block; text-decoration: none; background: var(--card); border: 1px solid var(--rule); border-top: 3px solid var(--gold); border-radius: var(--radius); padding: 16px; color: var(--navy); transition: transform .15s, box-shadow .15s; }
.tool-link:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.tool-link .t-unit { font-family: var(--mono); font-size: 10.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--gold-deep); }
.tool-link .t-name { font-family: var(--serif); font-weight: 700; font-size: 19px; margin: 4px 0; }
.tool-link .t-what { font-size: 14px; color: var(--navy-soft); }

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .see-grid { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .menu-btn { display: flex; }
  .top { padding: 8px 16px; gap: 12px; }
  .top-title, .back-home { display: none; }
  .brand-rex { height: 38px; }
  .wordmark { font-size: 19px; }
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: fixed; top: 55px; left: 0; bottom: 0; width: 260px; height: auto; background: var(--cream); z-index: 25; transform: translateX(-100%); transition: transform .2s ease; box-shadow: var(--shadow); }
  .sidebar.open { transform: none; }
  main { padding: 22px 16px 60px; }
  .tutor-layout { grid-template-columns: 1fr; height: auto; min-height: 0; }
  .unit-panel { border-right: none; border-bottom: 1px solid var(--rule); max-height: 210px; }
  .log { min-height: 340px; max-height: 60vh; }
  .msg { max-width: 92%; }
  .q-card { padding-right: 24px; padding-top: 84px; }
  .dino-perch { width: 52px; height: 62px; top: 10px; }
  .dino-perch img { width: 52px; }
  .stats { grid-template-columns: 1fr; }
  .modebar-right { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}