/* Thompkins Prep · "Room 214" design. Warm classroom, a real board, Mr. T in the room. */
:root {
  --paper: #F4EFE4;
  --paper-2: #EDE6D6;
  --card: #FFFDF8;
  --board: #FDFCF8;
  --line: #E4DED0;
  --grid: #EEF0F3;
  --ink: #1C2340;
  --ink-2: #4E5673;
  --ink-3: #7C8299;
  --brand: #0E6B66;
  --brand-2: #0A524E;
  --brand-soft: #D8EEEA;
  --blue: #2350D3;  --blue-soft: #E5ECFD;
  --red: #D7413A;   --red-soft: #FBE7E5;
  --green: #1B8F5E; --green-soft: #E1F4EA;
  --orange: #E58719; --orange-soft: #FDF0DF;
  --purple: #7546D6;
  --sticky: #FFE89A; --sticky-ink: #5A4A10;
  --shadow: 0 1px 2px rgba(60,50,30,.06), 0 12px 32px rgba(60,50,30,.10);
  --shadow-lg: 0 2px 4px rgba(60,50,30,.06), 0 28px 60px rgba(60,50,30,.16);
  --r: 22px;
  --head: "Bricolage Grotesque", ui-sans-serif, system-ui, sans-serif;
  --body: "Figtree", ui-sans-serif, system-ui, sans-serif;
  --hand: "Caveat", cursive;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--body); font-size: 17px; line-height: 1.5; -webkit-font-smoothing: antialiased; }
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--brand); }
img { max-width: 100%; display: block; }
h1, h2, h3 { font-family: var(--head); letter-spacing: -0.025em; line-height: 1.05; margin: 0; }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; border-radius: 8px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- shell ---------- */
.top { position: sticky; top: 0; z-index: 30; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.top-in { max-width: 1240px; margin: 0 auto; padding: 10px 20px; display: flex; align-items: center; gap: 18px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font-family: var(--head); font-weight: 800; font-size: 21px; letter-spacing: -0.03em; }
.logo .face { width: 40px; height: 40px; border-radius: 50%; background: var(--brand-soft); overflow: hidden; }
.logo .face img { width: 100%; transform: scale(1.9) translateY(18%); }
.nav { display: flex; gap: 4px; margin-left: 12px; }
.nav a { text-decoration: none; color: var(--ink-2); font-weight: 650; padding: 8px 14px; border-radius: 999px; }
.nav a.on { color: var(--ink); background: var(--card); box-shadow: var(--shadow); }
.nav a:hover { color: var(--ink); }
.top-right { margin-left: auto; display: flex; gap: 10px; align-items: center; }
.chip { display: inline-flex; align-items: center; gap: 6px; padding: 6px 12px; border-radius: 999px; background: var(--card); border: 1px solid var(--line); font-weight: 700; font-size: 14px; color: var(--ink-2); }
.chip.fire { color: var(--orange); }
.iconbtn { width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--line); background: var(--card); display: grid; place-items: center; }
.wrap { max-width: 1240px; margin: 0 auto; padding: 26px 20px 120px; }
.tabbar { display: none; }
@media (max-width: 820px) {
  .nav { display: none; }
  .tabbar { display: flex; position: fixed; left: 0; right: 0; bottom: 0; z-index: 40; background: var(--card); border-top: 1px solid var(--line); padding: 6px 6px calc(6px + env(safe-area-inset-bottom)); }
  .tabbar a { flex: 1; text-align: center; text-decoration: none; color: var(--ink-3); font-size: 12px; font-weight: 700; padding: 6px 0; border-radius: 14px; }
  .tabbar a span { display: block; font-size: 20px; line-height: 1.2; }
  .tabbar a.on { color: var(--brand); background: var(--brand-soft); }
  .wrap { padding: 18px 16px 110px; }
}

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; border: 0; border-radius: 16px; padding: 14px 22px; font-weight: 750; font-size: 17px; text-decoration: none; transition: transform .12s ease, box-shadow .12s ease, background .12s; }
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--brand); color: #fff; box-shadow: 0 6px 0 var(--brand-2); }
.btn.primary:hover { transform: translateY(-1px); }
.btn.primary:active { transform: translateY(4px); box-shadow: 0 2px 0 var(--brand-2); }
.btn.ghost { background: var(--card); color: var(--ink); border: 2px solid var(--line); }
.btn.ghost:hover { border-color: var(--ink-3); }
.btn.sm { padding: 9px 14px; border-radius: 12px; font-size: 15px; }
.btn.big { padding: 18px 28px; font-size: 19px; border-radius: 18px; }
.link { background: none; border: 0; color: var(--brand); font-weight: 700; padding: 0; text-decoration: underline; text-underline-offset: 3px; }

/* ---------- cards ---------- */
.card { background: var(--card); border-radius: var(--r); box-shadow: var(--shadow); padding: 24px; }
.kicker { font-weight: 800; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; color: var(--brand); }
.muted { color: var(--ink-2); }
.hand { font-family: var(--hand); }
.grid { display: grid; gap: 18px; }
.sec-title { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin: 40px 0 16px; }
.sec-title h2 { font-size: 30px; }

/* ---------- Mr. T ---------- */
.mrt { position: relative; }
.mrt img { width: 100%; height: auto; filter: drop-shadow(0 18px 18px rgba(60,45,20,.18)); }
.bubble { position: relative; background: var(--card); border-radius: 26px; padding: 22px 26px; box-shadow: var(--shadow-lg); font-size: 19px; line-height: 1.45; }
.bubble .who { font-family: var(--head); font-weight: 800; font-size: 15px; color: var(--brand); margin-bottom: 6px; }
.bubble.tail-left::before { content: ""; position: absolute; left: -12px; top: 36px; width: 26px; height: 26px; background: var(--card); transform: rotate(45deg); border-radius: 5px; }
.bubble.tail-down::before { content: ""; position: absolute; left: 50%; bottom: -12px; width: 26px; height: 26px; margin-left: -13px; background: var(--card); transform: rotate(45deg); border-radius: 5px; }
.typing::after { content: "▍"; color: var(--brand); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* ---------- home ---------- */
.desk { position: relative; display: grid; grid-template-columns: 330px 1fr; gap: 10px 34px; align-items: center; background: linear-gradient(180deg, var(--paper-2), var(--paper)); border-radius: 34px; padding: 30px 34px 34px; overflow: hidden; border: 1px solid var(--line); }
.desk::after { content: ""; position: absolute; inset: auto 0 0 0; height: 70px; background: linear-gradient(0deg, color-mix(in srgb, var(--orange) 14%, transparent), transparent); pointer-events: none; }
.desk .mrt { align-self: end; margin-bottom: -34px; }
.desk h1 { font-size: clamp(38px, 5vw, 60px); margin: 8px 0 14px; }
.desk .actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.plan { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.plan .step { display: flex; align-items: center; gap: 8px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 8px 12px; font-weight: 650; font-size: 15px; }
.plan .step b { width: 24px; height: 24px; border-radius: 8px; background: var(--brand-soft); color: var(--brand); display: grid; place-items: center; font-size: 13px; }
@media (max-width: 820px) {
  .desk { grid-template-columns: 1fr; padding: 22px 20px 0; }
  .desk .mrt { order: -1; max-width: 200px; margin: 0 auto -6px; }
  .desk { padding-bottom: 24px; }
}

/* class path */
.path { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
@media (max-width: 1000px) { .path { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .path { grid-template-columns: 1fr; } }
.cls { position: relative; display: flex; flex-direction: column; gap: 10px; text-decoration: none; color: var(--ink); background: var(--card); border-radius: 22px; padding: 18px; box-shadow: var(--shadow); border: 2px solid transparent; transition: transform .15s ease, border-color .15s; min-height: 210px; }
.cls:hover { transform: translateY(-3px); border-color: var(--line); }
.cls.next { border-color: var(--brand); }
.cls .thumb { position: relative; aspect-ratio: 16/9; border-radius: 14px; overflow: hidden; background: var(--board); background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px); background-size: 18px 18px; border: 4px solid #C7CDD6; }
.cls .thumb .n { position: absolute; left: 10px; top: 6px; font-family: var(--head); font-weight: 800; font-size: 34px; color: var(--ink); }
.cls .thumb img { position: absolute; right: -6px; bottom: -10px; width: 52%; }
.cls h3 { font-size: 19px; }
.cls .meta { display: flex; justify-content: space-between; align-items: center; font-size: 14px; color: var(--ink-2); font-weight: 600; margin-top: auto; }
.badge { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 999px; font-weight: 800; font-size: 12px; letter-spacing: .03em; }
.badge.done { background: var(--green-soft); color: var(--green); }
.badge.next { background: var(--brand); color: #fff; }
.badge.part { background: var(--orange-soft); color: var(--orange); }
.bar { height: 8px; border-radius: 4px; background: var(--line); overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--brand); border-radius: 4px; }

.two { display: grid; grid-template-columns: 1.2fr 1fr; gap: 18px; }
@media (max-width: 900px) { .two { grid-template-columns: 1fr; } }
.noticed { display: grid; grid-template-columns: 84px 1fr; gap: 18px; align-items: start; }
.noticed .face { width: 84px; height: 84px; border-radius: 50%; background: var(--orange-soft); overflow: hidden; }
.noticed .face img { width: 100%; transform: scale(1.6) translateY(16%); }
.fixlist { display: grid; gap: 10px; margin-top: 12px; }
.fix { display: flex; gap: 12px; align-items: center; justify-content: space-between; background: var(--paper); border-radius: 14px; padding: 12px 14px; }
.fix p { margin: 0; font-weight: 600; }
.week { display: flex; gap: 8px; margin-top: 14px; }
.week .d { flex: 1; text-align: center; }
.week .d i { display: block; height: 40px; border-radius: 12px; background: var(--line); margin-bottom: 4px; }
.week .d.on i { background: var(--orange); }
.week .d small { font-weight: 700; color: var(--ink-3); }

/* ---------- class player ---------- */
.room { display: grid; grid-template-columns: minmax(0, 1fr) 360px; gap: 20px; align-items: start; }
@media (max-width: 1080px) { .room { grid-template-columns: 1fr; } }
.screen { position: relative; border-radius: 26px; overflow: hidden; background: #000; box-shadow: var(--shadow-lg); aspect-ratio: 16/9; }
.screen video { width: 100%; height: 100%; display: block; background: #E8E1D2; }
.screen .bigplay { position: absolute; inset: 0; display: grid; place-items: center; background: linear-gradient(0deg, rgba(20,24,44,.45), rgba(20,24,44,.05)); border: 0; color: #fff; }
.screen .bigplay span { display: flex; align-items: center; gap: 14px; background: var(--brand); padding: 18px 28px; border-radius: 999px; font-weight: 800; font-size: 20px; box-shadow: 0 6px 0 var(--brand-2); }
.controls { display: flex; align-items: center; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.controls .scrub { flex: 1 1 260px; display: flex; gap: 4px; height: 14px; align-items: center; cursor: pointer; }
.controls .scrub i { display: block; height: 8px; border-radius: 4px; background: var(--line); position: relative; overflow: hidden; }
.controls .scrub i.chk { background: color-mix(in srgb, var(--orange) 35%, var(--line)); }
.controls .scrub i b { position: absolute; left: 0; top: 0; bottom: 0; background: var(--brand); }
.controls .t { font-variant-numeric: tabular-nums; font-weight: 700; color: var(--ink-2); font-size: 14px; min-width: 92px; text-align: right; }
.ctl { border: 0; background: var(--card); box-shadow: var(--shadow); border-radius: 12px; height: 40px; min-width: 40px; padding: 0 12px; font-weight: 750; }
.ctl.on { background: var(--brand-soft); color: var(--brand); }
.hand-btn { background: var(--orange); color: #fff; box-shadow: 0 5px 0 #B9650B; }

/* checkpoint overlay on the video */
.cp { position: absolute; inset: 0; display: grid; place-items: center; background: rgba(28,35,64,.55); backdrop-filter: blur(3px); padding: 3%; animation: fadein .25s ease; }
@keyframes fadein { from { opacity: 0; } }
.cp.out { opacity: 0; transition: opacity .2s; }
.cp-card { width: min(860px, 100%); max-height: 100%; overflow: auto; background: var(--card); border-radius: 24px; padding: 22px 24px; display: grid; grid-template-columns: 120px 1fr; gap: 6px 20px; box-shadow: var(--shadow-lg); animation: rise .35s cubic-bezier(.2,.8,.2,1); }
@keyframes rise { from { transform: translateY(18px); opacity: 0; } }
.cp-card .face { grid-row: span 3; align-self: start; }
.cp-card .q { font-family: var(--head); font-weight: 700; font-size: clamp(17px, 2vw, 23px); line-height: 1.2; letter-spacing: -0.015em; }
.choices { display: grid; gap: 8px; margin-top: 10px; }
.cp .choices { grid-template-columns: 1fr 1fr; }
@media (max-width: 760px) { .cp .choices { grid-template-columns: 1fr; } }
.choice { display: flex; gap: 12px; align-items: center; text-align: left; width: 100%; padding: 11px 14px; border-radius: 14px; border: 2px solid var(--line); background: var(--card); font-weight: 600; font-size: 16px; line-height: 1.3; transition: border-color .12s, background .12s, transform .1s; }
.choice:hover:not(:disabled) { border-color: var(--ink-3); transform: translateX(2px); }
.choice .L { flex: 0 0 auto; width: 32px; height: 32px; border-radius: 10px; background: var(--ink); color: var(--card); display: grid; place-items: center; font-family: var(--head); font-weight: 800; }
.choice.right { border-color: var(--green); background: var(--green-soft); }
.choice.right .L { background: var(--green); color: #fff; }
.choice.wrong { border-color: var(--red); background: var(--red-soft); }
.choice.wrong .L { background: var(--red); color: #fff; }
.choice:disabled { cursor: default; }
.react { margin: 4px 0 10px; padding: 12px 14px; border-radius: 16px; font-size: 16px; line-height: 1.45; animation: rise .3s ease; }
.react.good { background: var(--green-soft); }
.react.bad { background: var(--orange-soft); }
.react b { font-family: var(--head); }
.react .row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; }
@media (max-width: 640px) { .cp-card { grid-template-columns: 1fr; } .cp-card .face { display: none; } }

/* notes + chapters */
.side { display: grid; gap: 16px; }
.notes { background: var(--board); border-radius: 22px; box-shadow: var(--shadow); padding: 18px 18px 8px; background-image: linear-gradient(var(--grid) 1px, transparent 1px); background-size: 100% 32px; max-height: 520px; overflow: auto; }
.notes h3 { font-size: 20px; display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.note { padding: 10px 0 12px; border-bottom: 1px dashed var(--line); }
.note.new { animation: rise .4s ease; }
.note:last-child { border-bottom: 0; }
.note .h { font-weight: 800; font-size: 15px; margin-bottom: 4px; }
.note ul { margin: 0; padding-left: 18px; font-size: 15px; color: var(--ink-2); }
.note .eq { font-size: 20px; padding: 4px 0; }
.note.empty { color: var(--ink-3); font-family: var(--hand); font-size: 22px; border: 0; }
.chapters { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
.chapters button { width: 100%; display: flex; gap: 10px; align-items: center; text-align: left; border: 0; background: transparent; padding: 8px 10px; border-radius: 12px; font-weight: 600; font-size: 15px; color: var(--ink-2); }
.chapters button:hover { background: var(--paper); }
.chapters button.on { background: var(--brand-soft); color: var(--ink); }
.chapters .ic { width: 26px; height: 26px; flex: 0 0 auto; border-radius: 8px; display: grid; place-items: center; font-size: 13px; font-weight: 800; background: var(--paper); }
.chapters .on .ic { background: var(--brand); color: #fff; }
.chapters .tm { margin-left: auto; font-variant-numeric: tabular-nums; color: var(--ink-3); font-size: 13px; }

/* raise-hand panel */
.drawer { position: fixed; inset: 0; z-index: 60; background: rgba(20,24,44,.4); display: flex; justify-content: flex-end; animation: fadein .2s; }
.drawer-in { width: min(440px, 100%); height: 100%; background: var(--paper); padding: 24px; overflow: auto; animation: slidein .3s cubic-bezier(.2,.8,.2,1); display: flex; flex-direction: column; gap: 16px; }
@keyframes slidein { from { transform: translateX(40px); opacity: 0; } }
.askopts { display: grid; gap: 10px; }
.askopt { display: flex; gap: 14px; align-items: center; text-align: left; padding: 14px 16px; border: 2px solid var(--line); background: var(--card); border-radius: 16px; font-weight: 700; }
.askopt:hover { border-color: var(--brand); }
.askopt span { font-size: 24px; }
.askopt small { display: block; font-weight: 500; color: var(--ink-2); }

/* ---------- practice ---------- */
.qwrap { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 20px; align-items: start; }
@media (max-width: 900px) { .qwrap { grid-template-columns: 1fr; } .qwrap .coach { order: -1; } }
.qcard { background: var(--card); border-radius: 26px; box-shadow: var(--shadow); padding: 26px; }
.qcard .q { font-family: var(--head); font-weight: 650; font-size: 23px; line-height: 1.3; letter-spacing: -0.01em; margin: 10px 0 18px; }
.hints { display: grid; gap: 8px; margin-top: 14px; }
.hint { background: var(--sticky); color: var(--sticky-ink); border-radius: 10px; padding: 12px 14px; font-size: 16px; transform: rotate(-.3deg); animation: rise .3s ease; }
.coach { position: sticky; top: 80px; display: grid; gap: 10px; }
.coach .mrt { width: 270px; margin: 0 auto -16px; }
.qtop { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.dots { display: flex; gap: 6px; }
.dots i { width: 28px; height: 8px; border-radius: 4px; background: var(--line); }
.dots i.ok { background: var(--green); } .dots i.no { background: var(--red); } .dots i.cur { background: var(--brand); }

/* ---------- course ---------- */
.units { display: grid; gap: 12px; }
.unit { display: grid; grid-template-columns: 56px 1fr auto; gap: 16px; align-items: center; background: var(--card); border-radius: 20px; padding: 16px 18px; box-shadow: var(--shadow); text-decoration: none; color: var(--ink); }
.unit .num { width: 56px; height: 56px; border-radius: 16px; background: var(--paper); display: grid; place-items: center; font-family: var(--head); font-weight: 800; font-size: 24px; }
.unit.has-class .num { background: var(--brand); color: #fff; }
.unit h3 { font-size: 20px; }
.unit .sub { color: var(--ink-2); font-size: 14px; font-weight: 600; }
.tabs { display: inline-flex; gap: 4px; background: var(--paper-2); padding: 4px; border-radius: 14px; }
.tabs button { border: 0; background: transparent; padding: 8px 14px; border-radius: 10px; font-weight: 700; color: var(--ink-2); }
.tabs button.on { background: var(--card); color: var(--ink); box-shadow: var(--shadow); }
.lesson-read { display: grid; gap: 14px; }
.lesson-read .card p { margin: 0 0 10px; }
.eqrow { display: grid; grid-template-columns: 200px 1fr; gap: 14px; align-items: center; padding: 10px 0; border-bottom: 1px dashed var(--line); }
.trap { background: var(--red-soft); border-radius: 14px; padding: 12px 14px; font-weight: 600; }

/* ---------- welcome ---------- */
.welcome { min-height: calc(100vh - 70px); display: grid; grid-template-columns: 1fr 1fr; gap: 30px; align-items: center; max-width: 1100px; margin: 0 auto; padding: 30px 20px; }
.welcome h1 { font-size: clamp(42px, 6vw, 76px); margin: 10px 0 16px; }
.welcome .mrt { max-width: 460px; justify-self: center; }
.namefield { display: flex; gap: 10px; margin-top: 22px; flex-wrap: wrap; }
.namefield input { flex: 1 1 220px; padding: 15px 18px; border-radius: 16px; border: 2px solid var(--line); background: var(--card); font-size: 18px; }
.namefield input:focus { outline: none; border-color: var(--brand); }
.coursepick { display: grid; gap: 10px; margin-top: 18px; }
.coursepick button { text-align: left; padding: 16px 18px; border-radius: 16px; border: 2px solid var(--line); background: var(--card); font-weight: 750; font-size: 17px; }
.coursepick button small { display: block; font-weight: 500; color: var(--ink-2); }
.coursepick button.on { border-color: var(--brand); background: var(--brand-soft); }
@media (max-width: 820px) { .welcome { grid-template-columns: 1fr; } .welcome .mrt { max-width: 280px; order: -1; } }

/* ---------- celebrations ---------- */
.done-hero { text-align: center; padding: 30px 10px; }
.done-hero .mrt { width: 260px; margin: 0 auto; }
.done-hero h1 { font-size: clamp(36px, 5vw, 56px); margin: 10px 0; }
.stats { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin: 20px 0; }
.stat { background: var(--card); border-radius: 18px; padding: 14px 20px; box-shadow: var(--shadow); min-width: 130px; }
.stat b { display: block; font-family: var(--head); font-size: 34px; }
.stat small { color: var(--ink-2); font-weight: 700; }
.confetti { position: fixed; inset: 0; pointer-events: none; z-index: 80; overflow: hidden; }
.confetti i { position: absolute; top: -20px; width: 10px; height: 16px; border-radius: 3px; animation: fall 1.8s ease-in forwards; }
@keyframes fall { to { transform: translateY(110vh) rotate(720deg); opacity: .8; } }
.toast { position: fixed; left: 50%; bottom: 90px; transform: translateX(-50%); background: var(--ink); color: var(--card); padding: 12px 20px; border-radius: 14px; font-weight: 700; z-index: 90; animation: rise .25s ease; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; } }
.katex { font-size: 1.05em; }

/* =====================================================================
   v3 · classroom identity: grid paper, marker underlines, sticky notes,
   Mr. T's handwriting. Everything below extends or overrides v2.
   ===================================================================== */
body { background: var(--paper); background-image: radial-gradient(color-mix(in srgb, var(--ink) 7%, transparent) 1px, transparent 1px); background-size: 22px 22px; }
.logo span em { font-style: normal; color: var(--brand); }
.small { font-size: 14px; }
.lead { font-size: 19px; color: var(--ink-2); max-width: 680px; line-height: 1.5; }
.hl { background: linear-gradient(transparent 62%, #FFE07A 62%, #FFE07A 92%, transparent 92%); padding: 0 .08em; }
.ul { background: linear-gradient(transparent 70%, color-mix(in srgb, var(--brand) 28%, transparent) 70%); padding: 0 .1em; }
.back { display: inline-block; text-decoration: none; color: var(--ink-2); font-weight: 700; margin-bottom: 6px; }
.back:hover { color: var(--brand); }
.warn { color: var(--red); font-weight: 700; }
.btn.amber { background: var(--orange); color: #fff; box-shadow: 0 6px 0 #B9650B; }
.btn.amber:active { transform: translateY(4px); box-shadow: 0 2px 0 #B9650B; }
.row-actions { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

/* class switcher */
.switch { position: relative; }
.switch-btn { display: flex; align-items: center; gap: 8px; border: 2px solid var(--line); background: var(--card); border-radius: 999px; padding: 4px 12px 4px 4px; font-weight: 750; font-size: 14px; }
.switch-btn:hover { border-color: var(--ink-3); }
.dot { width: 30px; height: 30px; border-radius: 50%; display: inline-grid; place-items: center; color: #fff; font-size: 13px; font-weight: 800; flex: 0 0 auto; }
.caret { color: var(--ink-3); font-size: 12px; }
.switch-menu { position: absolute; right: 0; top: calc(100% + 8px); width: 330px; background: var(--card); border-radius: 20px; box-shadow: var(--shadow-lg); border: 1px solid var(--line); padding: 6px; z-index: 50; animation: rise .2s ease; }
.switch-menu button { width: 100%; display: flex; gap: 12px; align-items: center; text-align: left; border: 0; background: transparent; border-radius: 14px; padding: 10px 12px; }
.switch-menu button:hover { background: var(--paper); }
.switch-menu button.on { background: var(--brand-soft); }
.switch-menu button small { display: block; color: var(--ink-2); font-size: 13px; font-weight: 500; }
.switch-menu .tick { margin-left: auto; color: var(--brand); font-weight: 900; }
.sw-foot { display: block; padding: 10px 12px 8px; font-size: 13px; font-weight: 700; color: var(--brand); text-decoration: none; border-top: 1px dashed var(--line); margin-top: 4px; }
@media (max-width: 560px) { .sw-name { display: none; } .switch-menu { width: min(330px, calc(100vw - 24px)); } }

/* welcome + placement */
.welcome .lead { margin-top: 4px; }
.hero-mrt { position: relative; }
.hand-note { position: absolute; left: 4%; top: 12%; font-family: var(--hand); font-size: 30px; color: var(--blue); transform: rotate(-8deg); }
.where { max-width: 1080px; margin: 0 auto; padding: 30px 20px 80px; }
.where-head { display: grid; grid-template-columns: 150px 1fr; gap: 20px; align-items: center; margin-bottom: 24px; }
.where-head h1 { font-size: clamp(30px, 4vw, 46px); margin: 6px 0 10px; }
.course-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
@media (max-width: 900px) { .course-grid { grid-template-columns: 1fr 1fr; } .where-head { grid-template-columns: 90px 1fr; } }
.course-card { display: grid; gap: 6px; text-align: left; padding: 16px; border-radius: 20px; border: 2px solid var(--line); background: var(--card); transition: transform .12s, border-color .12s; }
.course-card:hover { transform: translateY(-2px); }
.course-card .dot { background: var(--c); width: 40px; height: 40px; font-size: 16px; }
.course-card b { font-family: var(--head); font-size: 17px; letter-spacing: -0.01em; line-height: 1.15; }
.course-card small { color: var(--ink-2); font-weight: 600; }
.course-card.on { border-color: var(--c); box-shadow: 0 0 0 4px color-mix(in srgb, var(--c) 18%, transparent); }
.unit-pick { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 10px; }
.unit-pick button { display: flex; gap: 12px; align-items: center; text-align: left; padding: 12px 14px; border-radius: 16px; border: 2px solid var(--line); background: var(--card); font-weight: 700; }
.unit-pick button small { display: block; color: var(--brand); font-weight: 700; font-size: 12px; }
.unit-pick .n { width: 34px; height: 34px; border-radius: 10px; background: var(--paper); display: grid; place-items: center; font-family: var(--head); font-weight: 800; flex: 0 0 auto; }
.unit-pick button.on { border-color: var(--brand); background: var(--brand-soft); }
.unit-pick button.on .n { background: var(--brand); color: #fff; }
.where-go { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }

/* page heads */
.page-head { display: flex; justify-content: space-between; align-items: center; gap: 20px; margin: 6px 0 18px; }
.page-head h1 { font-size: clamp(34px, 5vw, 54px); margin: 6px 0 10px; }
.page-mrt { width: 150px; flex: 0 0 auto; filter: drop-shadow(0 14px 14px rgba(60,45,20,.16)); }
@media (max-width: 700px) { .page-mrt { display: none; } }

/* home hero: a board with Mr. T standing next to it */
.desk { grid-template-columns: 1fr 300px; background: var(--board); background-image: linear-gradient(var(--grid) 1.5px, transparent 1.5px), linear-gradient(90deg, var(--grid) 1.5px, transparent 1.5px); background-size: 34px 34px; border: 10px solid #C7CDD6; box-shadow: var(--shadow-lg); padding: 34px 38px 38px; overflow: visible; }
.desk::after { display: none; }
.desk .mrt { order: 2; margin: -40px -10px -38px 0; }
.desk-board { position: relative; z-index: 1; }
.desk h1 { font-size: clamp(40px, 5.2vw, 64px); }
.desk .bubble { max-width: 640px; }
@media (max-width: 820px) { .desk { grid-template-columns: 1fr; border-width: 6px; padding: 20px; } .desk .mrt { order: -1; max-width: 190px; margin: -10px auto -10px; } }

/* where-you-are path */
.upath { display: flex; gap: 6px; overflow-x: auto; padding: 6px 2px 12px; scrollbar-width: thin; }
.ustep { position: relative; flex: 1 0 128px; display: grid; gap: 6px; justify-items: start; text-decoration: none; color: var(--ink); background: var(--card); border: 2px solid var(--line); border-radius: 16px; padding: 12px; min-height: 92px; transition: transform .12s; }
.ustep:hover { transform: translateY(-2px); }
.ustep .b { width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; font-family: var(--head); font-weight: 800; background: var(--paper); }
.ustep .l { font-size: 13px; font-weight: 700; line-height: 1.2; color: var(--ink-2); }
.ustep.done { background: var(--green-soft); border-color: transparent; }
.ustep.done .b { background: var(--green); color: #fff; }
.ustep.here { border-color: var(--brand); box-shadow: 0 0 0 4px color-mix(in srgb, var(--brand) 16%, transparent); }
.ustep.here .b { background: var(--brand); color: #fff; }
.ustep.here .l { color: var(--ink); }
.ustep .you { position: absolute; top: -12px; right: 10px; background: var(--sticky); color: var(--sticky-ink); font-family: var(--hand); font-size: 18px; padding: 0 8px; border-radius: 4px; transform: rotate(2deg); }
.ustep.ahead { opacity: .72; }

/* class cards */
.cls { padding: 14px; gap: 8px; }
.cls-link { display: grid; gap: 8px; text-decoration: none; color: var(--ink); }
.cls .thumb .play { position: absolute; left: 12px; bottom: 10px; width: 36px; height: 36px; border-radius: 50%; background: var(--brand); color: #fff; display: grid; place-items: center; font-size: 14px; box-shadow: 0 4px 0 var(--brand-2); }
.cls.is-done .thumb { opacity: .75; }
.seen { border: 0; background: none; color: var(--ink-3); font-size: 13px; font-weight: 700; text-align: left; padding: 2px 0; text-decoration: underline; text-underline-offset: 3px; }
.seen:hover { color: var(--brand); }

/* home tiles */
.grid3 { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 18px; margin-top: 26px; }
@media (max-width: 1000px) { .grid3 { grid-template-columns: 1fr; } }
.tile { display: flex; flex-direction: column; gap: 8px; }
.tile-head { display: flex; gap: 10px; align-items: center; }
.tile-head h3 { font-size: 20px; }
.ic { width: 34px; height: 34px; border-radius: 11px; display: grid; place-items: center; font-weight: 900; color: #fff; flex: 0 0 auto; }
.ic.amber { background: var(--orange); } .ic.teal { background: var(--brand); } .ic.red { background: var(--red); }
.tile-foot { display: flex; gap: 8px; flex-wrap: wrap; margin-top: auto; padding-top: 10px; }
.qlist { display: grid; gap: 8px; }
.qrow { display: grid; grid-template-columns: 82px 1fr auto; gap: 10px; align-items: center; text-decoration: none; color: var(--ink); background: var(--paper); border-radius: 14px; padding: 10px 12px; }
.qrow:hover { background: var(--brand-soft); }
.qrow .qt small, .qcard2 small, .frq-row small { display: block; color: var(--ink-2); font-size: 13px; font-weight: 500; }
.when { font-family: var(--head); font-weight: 800; font-size: 15px; color: var(--ink-2); }
.when.hot { color: var(--orange); }
.when small { display: block; font-family: var(--body); font-weight: 600; font-size: 12px; color: var(--ink-3); }
.go { color: var(--brand); font-weight: 800; }
.ring-row { display: flex; gap: 16px; align-items: center; }
.ring { flex: 0 0 auto; }

/* class page */
.class-head { display: flex; justify-content: space-between; align-items: end; gap: 16px; flex-wrap: wrap; margin: 6px 0 16px; }
.class-head h1 { font-size: clamp(30px, 4vw, 44px); margin-top: 6px; }
.small-hand { font-family: var(--hand); font-weight: 500; font-size: 20px; color: var(--blue); }
.vid-missing { position: absolute; inset: 0; display: grid; place-items: center; background: var(--board); color: var(--ink); padding: 30px; text-align: center; }
.vid-missing img { width: 170px; margin: 0 auto; }

/* classes page */
.unit-block { background: var(--card); border-radius: 26px; box-shadow: var(--shadow); padding: 20px; margin-bottom: 16px; }
.unit-block.soon { padding: 16px 20px; background: color-mix(in srgb, var(--card) 70%, transparent); box-shadow: none; border: 2px dashed var(--line); }
.ub-head { display: flex; gap: 16px; align-items: center; margin-bottom: 14px; }
.unit-block.soon .ub-head { margin: 0; }
.ub-head .row-actions { margin-left: auto; }
.ub-head h2 { font-size: 24px; }
.ub-head .num, .unit .num { width: 50px; height: 50px; border-radius: 15px; background: var(--paper); display: grid; place-items: center; font-family: var(--head); font-weight: 800; font-size: 22px; flex: 0 0 auto; }
.unit-block:not(.soon) .num { background: var(--brand); color: #fff; }

/* practice */
.callout { display: flex; gap: 16px; align-items: center; justify-content: space-between; flex-wrap: wrap; background: var(--orange-soft); margin-bottom: 8px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.topic { display: inline-flex; align-items: center; gap: 8px; border: 2px solid var(--line); background: var(--card); border-radius: 999px; padding: 8px 14px; font-weight: 700; font-size: 14px; cursor: pointer; transition: border-color .12s, background .12s; }
.topic small { font-size: 11px; font-weight: 800; color: var(--ink-3); background: var(--paper); border-radius: 6px; padding: 1px 6px; }
.topic:hover { border-color: var(--ink-3); }
.topic.here { border-color: color-mix(in srgb, var(--brand) 40%, var(--line)); }
.topic input { accent-color: var(--brand); width: 16px; height: 16px; margin: 0; }
.topic:has(input:checked) { background: var(--brand-soft); border-color: var(--brand); }
.unit.is-here { box-shadow: 0 0 0 3px var(--brand), var(--shadow); }
pre.code, .qcard pre.code { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 15px; line-height: 1.5; background: #1C2340; color: #EEF0F8; border-radius: 12px; padding: 14px 16px; overflow-x: auto; white-space: pre; margin: 8px 0; tab-size: 4; }
.choice pre.code { font-size: 13px; padding: 8px 10px; margin: 0; }
.codechip { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 14px; background: #1C2340; color: #EEF0F8; border-radius: 8px; padding: 4px 8px; white-space: pre-wrap; display: inline-block; }

/* quizzes & tests */
.planner { padding: 0; overflow: hidden; border: 2px solid color-mix(in srgb, var(--orange) 40%, var(--line)); }
.planner-head { width: 100%; display: flex; gap: 14px; align-items: center; text-align: left; border: 0; background: var(--orange-soft); padding: 18px 22px; }
.planner-head b { font-family: var(--head); font-size: 20px; display: block; }
.planner-head small { color: var(--ink-2); font-weight: 500; }
.planner-head .caret { margin-left: auto; font-size: 16px; transition: transform .2s; }
.planner.open .planner-head .caret { transform: rotate(180deg); }
.qform { display: none; grid-template-columns: 2fr 1fr; gap: 14px 18px; padding: 20px 22px 22px; }
.planner.open .qform { display: grid; }
.qform label { display: grid; gap: 6px; font-weight: 700; font-size: 14px; color: var(--ink-2); }
.qform input[type=text], .qform input:not([type]), .qform input[type=date], .qform select { padding: 12px 14px; border-radius: 12px; border: 2px solid var(--line); background: var(--card); font-size: 16px; color: var(--ink); font-weight: 600; }
.qform input:focus, .qform select:focus { outline: none; border-color: var(--brand); }
.qform .full { grid-column: 1 / -1; }
.qform .lbl { font-weight: 800; margin-bottom: 8px; }
.qform .topic { font-weight: 650; color: var(--ink); }
.seg { border: 0; padding: 0; margin: 0; display: flex; gap: 8px; flex-wrap: wrap; }
.seg legend { font-weight: 700; font-size: 14px; color: var(--ink-2); margin-bottom: 6px; }
.seg label { display: block; }
.seg input { position: absolute; opacity: 0; }
.seg span { display: inline-block; padding: 10px 16px; border-radius: 12px; border: 2px solid var(--line); background: var(--card); font-weight: 750; color: var(--ink); cursor: pointer; }
.seg input:checked + span { border-color: var(--brand); background: var(--brand-soft); }
.seg input:disabled + span { opacity: .45; cursor: not-allowed; }
.tgroup { display: grid; grid-template-columns: 70px 1fr; gap: 10px; align-items: start; margin-bottom: 10px; }
.tg-u { font-family: var(--head); font-weight: 800; color: var(--ink-3); padding-top: 9px; }
@media (max-width: 700px) { .qform { grid-template-columns: 1fr; } .tgroup { grid-template-columns: 1fr; } }
.qcards { display: grid; gap: 10px; }
.qcard2 { display: grid; grid-template-columns: 110px 1fr auto; gap: 14px; align-items: center; background: var(--card); border-radius: 18px; padding: 14px 18px; box-shadow: var(--shadow); border-left: 6px solid var(--orange); }
.qcard2.past { opacity: .6; border-left-color: var(--line); }
.qcard2 .qbody b { font-family: var(--head); font-size: 18px; }
.qcard2 .qact { display: flex; gap: 8px; }
@media (max-width: 640px) { .qcard2 { grid-template-columns: 1fr; } }
.ready { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 14px; }
.rcard { position: relative; display: grid; gap: 6px; text-decoration: none; color: var(--ink); background: var(--card); border-radius: 20px; padding: 20px 18px 18px; box-shadow: var(--shadow); border: 2px solid transparent; transition: transform .12s, border-color .12s; text-align: left; font: inherit; cursor: pointer; }
.rcard:hover { transform: translateY(-3px); border-color: var(--brand); }
.rcard b { font-family: var(--head); font-size: 19px; letter-spacing: -0.01em; }
.rcard small { color: var(--ink-2); font-weight: 500; }
.rcard .tag { justify-self: start; background: var(--sticky); color: var(--sticky-ink); font-weight: 800; font-size: 12px; padding: 3px 9px; border-radius: 6px; transform: rotate(-1.5deg); }
.rcard.big { grid-column: span 2; background: var(--ink); color: #fff; }
.rcard.big small { color: #C9CDE0; }
.rcard.frqc { border-left: 6px solid var(--purple); }
.rcard.big.frqc { background: #2B2160; }
.ghostcard { background: transparent; box-shadow: none; border: 2px dashed var(--line); }
@media (max-width: 560px) { .rcard.big { grid-column: auto; } }
.frq-list { display: grid; gap: 8px; }
.frq-row { display: grid; grid-template-columns: 54px 1fr auto; gap: 14px; align-items: center; text-decoration: none; color: var(--ink); background: var(--card); border-radius: 16px; padding: 12px 16px; box-shadow: var(--shadow); }
.frq-row:hover { box-shadow: 0 0 0 2px var(--purple), var(--shadow); }
.frq-row .u { width: 46px; height: 46px; border-radius: 14px; background: #EEE7FD; color: var(--purple); display: grid; place-items: center; font-family: var(--head); font-weight: 800; }
.hist { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }

/* timed test */
.test-bar { position: sticky; top: 64px; z-index: 20; display: flex; justify-content: space-between; align-items: center; gap: 12px; background: color-mix(in srgb, var(--paper) 92%, transparent); backdrop-filter: blur(8px); padding: 10px 0; margin-bottom: 10px; }
.test-bar .back { margin: 0; }
.timer { font-family: var(--head); font-weight: 800; font-size: 20px; background: var(--card); border-radius: 12px; padding: 6px 14px; box-shadow: var(--shadow); font-variant-numeric: tabular-nums; }
.timer.low { color: var(--red); }
.qcard.test { max-width: 900px; margin: 0 auto; }
.choice.picked { border-color: var(--blue); background: var(--blue-soft); }
.choice.picked .L { background: var(--blue); color: #fff; }
.dots i.here { outline: 2px solid var(--ink); outline-offset: 1px; }
.review { display: grid; gap: 10px; }
.rv { background: var(--card); border-radius: 16px; padding: 12px 16px; box-shadow: var(--shadow); border-left: 6px solid var(--green); }
.rv.no { border-left-color: var(--red); }
.rv summary { cursor: pointer; font-weight: 700; }
.rv .mark { display: inline-grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; background: var(--green); color: #fff; font-size: 13px; margin-right: 6px; }
.rv.no .mark { background: var(--red); }
.rv .q { margin: 12px 0 6px; font-weight: 600; }

/* FRQ */
.frq { max-width: 960px; margin: 0 auto; display: grid; gap: 14px; }
.frq-head { display: flex; justify-content: space-between; align-items: end; gap: 12px; }
.frq-head h1 { font-size: clamp(28px, 4vw, 40px); margin-top: 6px; }
.frq-setup { font-size: 18px; line-height: 1.55; background: var(--board); background-image: linear-gradient(var(--grid) 1px, transparent 1px); background-size: 100% 30px; border-left: 6px solid var(--purple); }
.frq-q { display: grid; grid-template-columns: 46px 1fr auto; gap: 12px; align-items: start; font-size: 17px; font-weight: 600; line-height: 1.45; margin-bottom: 10px; }
.frq-q .lbl { font-family: var(--head); font-weight: 800; font-size: 20px; color: var(--purple); }
.frq-q .pts { font-size: 13px; font-weight: 800; color: var(--ink-3); background: var(--paper); border-radius: 8px; padding: 3px 8px; white-space: nowrap; }
.frq-part textarea { width: 100%; border: 2px solid var(--line); border-radius: 14px; padding: 12px 14px; font: inherit; background: var(--paper); resize: vertical; margin-bottom: 10px; }
.frq-part textarea:focus { outline: none; border-color: var(--purple); }
.rubric { margin-top: 10px; background: #F4F0FF; border-radius: 14px; padding: 14px 16px; display: grid; gap: 8px; }
.rb { display: grid; grid-template-columns: 24px 1fr; gap: 10px; align-items: start; font-size: 15px; line-height: 1.4; cursor: pointer; }
.rb input { width: 20px; height: 20px; accent-color: var(--purple); margin-top: 2px; }
.rubric details summary { cursor: pointer; font-weight: 800; color: var(--purple); }
.rubric .model { margin-top: 8px; white-space: pre-line; }
.frq-score { position: sticky; bottom: 16px; display: flex; justify-content: space-between; align-items: center; gap: 12px; background: var(--ink); color: #fff; }
.frq-score b { font-family: var(--head); font-size: 28px; display: block; }
.frq-score small { color: #C9CDE0; }

/* notes */
.bigidea { display: grid; grid-template-columns: 110px 1fr; gap: 18px; align-items: center; }
.bigidea p { font-size: 22px; font-weight: 700; margin: 6px 0 0; line-height: 1.3; }
.notebook { background: var(--board); background-image: linear-gradient(var(--grid) 1px, transparent 1px); background-size: 100% 32px; line-height: 32px; font-size: 18px; border-left: 6px solid #F0A4A0; }
.notebook p { margin: 0 0 16px; }
.notebook .think { font-size: 28px; color: var(--blue); line-height: 1.2; }
.ideas { margin: 0; padding-left: 20px; display: grid; gap: 8px; font-weight: 600; }
.card h3 { font-size: 22px; margin-bottom: 10px; }
.empty-card { text-align: center; padding: 40px 20px; }
.empty-card img { width: 170px; margin: 0 auto 10px; }

/* progress */
.spark { display: flex; gap: 10px; align-items: end; height: 150px; background: var(--card); border-radius: 20px; padding: 16px 20px 30px; box-shadow: var(--shadow); }
.sp { flex: 1; height: 100%; display: flex; flex-direction: column; justify-content: end; align-items: center; gap: 4px; max-width: 60px; }
.sp i { display: block; width: 100%; background: var(--brand); border-radius: 8px 8px 4px 4px; }
.sp small { font-weight: 800; color: var(--ink-2); font-size: 12px; }

/* type */
.qcard .q, .cp-card .q { white-space: normal; }
.choice > span:last-child { min-width: 0; }

[hidden] { display: none !important; }
.qform label.topic { display: inline-flex; gap: 6px; color: var(--ink); position: relative; }
.qform label.topic input, .chips label.topic input { position: absolute; opacity: 0; pointer-events: none; }
label.topic:has(input:checked)::before { content: "✓"; color: var(--brand); font-weight: 900; }
@media (max-width: 560px) { .logo { font-size: 17px; } .logo > span:last-child { white-space: nowrap; } .top-in { gap: 10px; padding: 8px 12px; } .sec-title { flex-wrap: wrap; } .sec-title h2 { font-size: 24px; } }

/* =====================================================================
   v4 · calm. One card style, thin borders, one accent (teal) plus amber
   only for Plus. No dot grid, no 3D buttons, no rotated stickers.
   ===================================================================== */
:root {
  --paper: #F6F3EC; --paper-2: #EFEADF; --card: #FFFFFF; --line: #E6E0D3; --line-2: #D9D2C2;
  --shadow: 0 1px 2px rgba(40,34,20,.05); --shadow-lg: 0 10px 30px rgba(40,34,20,.10);
  --r: 16px;
}
body { background: var(--paper); background-image: none; }
h1, h2, h3 { letter-spacing: -0.02em; }

/* icons */
svg.i { width: 18px; height: 18px; flex: 0 0 auto; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; vertical-align: -3px; }
.btn svg.i { width: 18px; height: 18px; }

/* top bar */
.top { background: color-mix(in srgb, var(--paper) 92%, transparent); }
.nav a { border-radius: 10px; font-weight: 600; }
.nav a.on { background: var(--paper-2); box-shadow: none; }
.chip { background: transparent; border-color: var(--line); font-weight: 650; }
.chip.streak svg.i { color: var(--orange); width: 16px; height: 16px; }
.chip.plus { color: var(--brand); border-color: color-mix(in srgb, var(--brand) 35%, var(--line)); text-decoration: none; }
.chip.plus svg.i { width: 15px; height: 15px; }
.sw-dot { width: 10px; height: 10px; border-radius: 3px; flex: 0 0 auto; display: inline-block; }
.switch-btn { border-width: 1px; padding: 7px 12px; }
.switch-menu { border-radius: 14px; }
.switch-menu button { gap: 10px; }
.switch-menu button .sw-dot { margin-top: 2px; align-self: start; }
.logo .face { background: var(--paper-2); }
@media (max-width: 820px) {
  .tabbar a { display: flex; flex-direction: column; align-items: center; gap: 2px; font-weight: 650; border-radius: 10px; }
  .tabbar a svg.i { width: 21px; height: 21px; }
}

/* buttons: flat */
.btn { border-radius: 12px; font-weight: 700; transition: background .12s, border-color .12s, transform .1s; }
.btn.primary, .btn.amber { box-shadow: none; }
.btn.primary:hover { background: var(--brand-2); transform: none; }
.btn.primary:active, .btn.amber:active { transform: scale(.98); box-shadow: none; }
.btn.amber { background: #D9770F; }
.btn.amber:hover { background: #BF6709; }
.btn.ghost { border-width: 1px; border-color: var(--line-2); }
.btn.big { border-radius: 14px; }
.hand-btn { box-shadow: none; }
.ctl { box-shadow: none; border: 1px solid var(--line); }
.screen .bigplay span { box-shadow: none; }

/* cards: one style */
.card, .qcard, .unit, .unit-block, .rcard, .qcard2, .frq-row, .rv, .stat, .spark, .notes, .cls { box-shadow: none; border: 1px solid var(--line); border-radius: var(--r); }
.screen { box-shadow: none; border-radius: 18px; }
.kicker { font-size: 12px; letter-spacing: .07em; font-weight: 750; }
.sec-title { margin: 36px 0 12px; }
.sec-title h2 { font-size: 24px; }
.ul { background: none; padding: 0; }
.hl { background: none; color: var(--brand); padding: 0; }
.page-head h1 { font-size: clamp(30px, 4vw, 44px); }
.page-mrt { width: 120px; filter: none; }
.mrt img { filter: none; }
.badge { border-radius: 6px; }

/* less sticker, less scribble */
.hint { transform: none; border-radius: 12px; background: #FFF6D6; border: 1px solid #F1E2A6; }
.rcard .tag { transform: none; border-radius: 6px; background: var(--paper-2); color: var(--ink-2); }
.rcard:hover { transform: none; border-color: var(--brand); }
.rcard.big { background: var(--card); color: var(--ink); border: 1.5px solid var(--brand); }
.rcard.big small { color: var(--ink-2); }
.rcard.big.frqc { background: var(--card); border-color: var(--purple); }
.rcard.frqc { border-left: 1px solid var(--line); }
.ustep .you { transform: none; font-family: var(--body); font-size: 11px; font-weight: 800; letter-spacing: .05em; text-transform: uppercase; background: var(--brand); color: #fff; padding: 2px 7px; top: -9px; }
.ustep, .course-card, .unit-pick button, .coursepick button, .choice, .askopt, .seg span, .namefield input, .qform input, .qform select, .frq-part textarea { border-width: 1px; }
.ustep:hover, .course-card:hover, .cls:hover { transform: none; }
.cls .thumb { border: 1px solid var(--line); background-image: none; background: var(--paper-2); }
.cls .thumb .play { box-shadow: none; }
.cls.next { border-color: var(--brand); }
.choice .L { border-radius: 8px; }
.choice:hover:not(:disabled) { transform: none; }
.notebook, .notes, .frq-setup { background-image: none; }
.notebook { line-height: 1.6; border-left: 3px solid var(--brand-soft); }
.ic { border-radius: 10px; }
.planner { border: 1px solid var(--line); }
.planner-head { background: var(--card); border-bottom: 1px solid transparent; }
.planner.open .planner-head { border-bottom-color: var(--line); }
.ph-ic { width: 36px; height: 36px; border-radius: 10px; background: var(--brand-soft); color: var(--brand); display: grid; place-items: center; flex: 0 0 auto; }
.qcard2 { border-left: 3px solid var(--orange); }
.callout { background: #FFF7EC; border-color: #F3DDBF; }
.good-call { background: var(--green-soft); border-color: #BFE3CF; }
.frq-score { border: 0; }
.course-card .dot { display: none; }
.course-card { border-top: 4px solid var(--c); }
.course-card.on { box-shadow: none; border-color: var(--c); border-width: 1px; border-top-width: 4px; background: color-mix(in srgb, var(--c) 6%, var(--card)); }
.unit-pick .n, .unit .num, .ub-head .num { border-radius: 10px; }

/* ---------- home: today's plan ---------- */
.today { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 34px; align-items: start; max-width: 980px; margin: 8px auto 0; }
.today-mrt { position: sticky; top: 90px; background: var(--paper-2); border-radius: 20px; overflow: hidden; aspect-ratio: 4 / 5; display: grid; align-items: end; }
.today-mrt img { width: 112%; max-width: none; margin: 0 -6% -4%; }
.today-hi { margin: 0; font-weight: 650; color: var(--ink-2); }
.today h1 { font-size: clamp(32px, 4.2vw, 48px); margin: 4px 0 10px; }
.today-say { margin: 0 0 22px; font-size: 18px; color: var(--ink-2); min-height: 1.5em; max-width: 620px; }
.agenda { list-style: none; margin: 0; padding: 0; background: var(--card); border: 1px solid var(--line); border-radius: 18px; overflow: hidden; }
.astep { display: grid; grid-template-columns: 34px minmax(0, 1fr) auto; gap: 16px; align-items: center; padding: 18px 20px; border-top: 1px solid var(--line); }
.astep:first-child { border-top: 0; }
.anum { width: 30px; height: 30px; border-radius: 50%; border: 1.5px solid var(--line-2); display: grid; place-items: center; font-family: var(--head); font-weight: 700; font-size: 15px; color: var(--ink-3); }
.abody { text-decoration: none; color: var(--ink); display: grid; gap: 2px; min-width: 0; }
.abody b { font-family: var(--head); font-size: 19px; font-weight: 650; letter-spacing: -0.01em; line-height: 1.25; }
.abody small { color: var(--ink-2); font-size: 15px; }
.alink { color: var(--ink-2); font-weight: 650; font-size: 15px; text-decoration: none; white-space: nowrap; }
.alink:hover { color: var(--brand); }
.astep.next { background: color-mix(in srgb, var(--brand) 5%, var(--card)); box-shadow: inset 3px 0 0 var(--brand); }
.astep.next .anum { border-color: var(--brand); background: var(--brand); color: #fff; }
.astep.done .anum { border-color: var(--green); background: var(--green); color: #fff; }
.astep.done .anum svg.i { width: 16px; height: 16px; stroke-width: 2.6; }
.astep.done .abody b { color: var(--ink-2); text-decoration: line-through; text-decoration-color: var(--line-2); }
.home-more { max-width: 980px; margin: 34px auto 0; padding-left: 244px; display: grid; gap: 14px; }
.hm-row { display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap; padding: 4px 2px 14px; border-bottom: 1px solid var(--line); }
.hm-where { display: grid; gap: 1px; }
.hm-where b { font-family: var(--head); font-size: 18px; font-weight: 650; }
.hm-where .muted { font-size: 15px; }
.hm-links { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.hm-links a { display: flex; gap: 12px; align-items: start; text-decoration: none; color: var(--ink); padding: 14px; border-radius: 14px; border: 1px solid var(--line); background: var(--card); transition: border-color .12s; }
.hm-links a:hover { border-color: var(--brand); }
.hm-links a > svg.i { color: var(--brand); margin-top: 2px; }
.hm-links b { display: block; font-size: 15px; font-weight: 700; line-height: 1.3; }
.hm-links small { display: block; color: var(--ink-2); font-size: 13.5px; line-height: 1.35; margin-top: 2px; }
@media (max-width: 860px) {
  .today { grid-template-columns: 1fr; gap: 14px; }
  .today-mrt { position: static; width: 120px; aspect-ratio: 1; border-radius: 50%; }
  .home-more { padding-left: 0; }
  .hm-links { grid-template-columns: 1fr; }
  .astep { grid-template-columns: 30px minmax(0, 1fr); padding: 16px; }
  .astep > .btn, .astep > .alink { grid-column: 2; justify-self: start; }
}

/* ---------- practice: units as a list ---------- */
.ulist { background: var(--card); border: 1px solid var(--line); border-radius: 18px; overflow: hidden; }
.uitem { border-top: 1px solid var(--line); }
.uitem:first-child { border-top: 0; }
.uitem summary { list-style: none; display: grid; grid-template-columns: 40px minmax(0, 1fr) 140px 16px; gap: 14px; align-items: center; padding: 16px 20px; cursor: pointer; }
.uitem summary::-webkit-details-marker { display: none; }
.uitem summary::after { content: ""; width: 8px; height: 8px; border-right: 2px solid var(--ink-3); border-bottom: 2px solid var(--ink-3); transform: rotate(45deg); transition: transform .15s; justify-self: center; margin-top: -4px; }
.uitem[open] summary::after { transform: rotate(-135deg); margin-top: 4px; }
.uitem summary:hover { background: var(--paper); }
.uitem .num { width: 36px; height: 36px; border-radius: 10px; background: var(--paper-2); display: grid; place-items: center; font-family: var(--head); font-weight: 700; }
.uitem[open] .num { background: var(--brand); color: #fff; }
.uitem .ut b { display: block; font-family: var(--head); font-weight: 650; font-size: 18px; letter-spacing: -0.01em; }
.uitem .ut small { color: var(--ink-2); font-size: 14px; }
.uitem .bar { height: 6px; }
.uitem-body { padding: 0 20px 14px 74px; display: grid; }
.trow { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 11px 0; border-top: 1px solid var(--line); text-decoration: none; color: var(--ink); font-weight: 600; font-size: 16px; }
.trow:first-child { border-top: 0; }
.trow svg.i { color: var(--ink-3); transition: transform .12s, color .12s; }
.trow:hover { color: var(--brand); }
.trow:hover svg.i { color: var(--brand); transform: translateX(3px); }
.trow.main { font-weight: 750; color: var(--brand); }
.trow.main svg.i { color: var(--brand); }
@media (max-width: 640px) {
  .uitem summary { grid-template-columns: 36px minmax(0, 1fr) 16px; padding: 14px 16px; }
  .uitem .bar { display: none; }
  .uitem-body { padding: 0 16px 12px 66px; }
}

/* ---------- planner topics: grouped checkboxes ---------- */
.tgroup { display: block; border: 1px solid var(--line); border-radius: 12px; margin-bottom: 8px; background: var(--card); }
.tgroup summary { cursor: pointer; padding: 11px 14px; font-weight: 700; font-size: 15px; color: var(--ink); list-style: none; display: flex; justify-content: space-between; align-items: center; }
.tgroup summary::-webkit-details-marker { display: none; }
.tgroup summary::after { content: ""; width: 7px; height: 7px; border-right: 2px solid var(--ink-3); border-bottom: 2px solid var(--ink-3); transform: rotate(45deg); }
.tgroup[open] summary::after { transform: rotate(-135deg); }
.checks { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 2px 14px; padding: 2px 14px 12px; }
.qform label.ck, label.ck { display: flex; gap: 10px; align-items: center; font-weight: 550; font-size: 15px; color: var(--ink); padding: 7px 0; cursor: pointer; }
label.ck input { width: 18px; height: 18px; accent-color: var(--brand); margin: 0; flex: 0 0 auto; }
@media (max-width: 700px) { .tgroup { grid-template-columns: none; } }

/* ---------- membership ---------- */
.freetag { display: inline-flex; align-items: center; gap: 4px; font-size: 11px; font-weight: 800; letter-spacing: .05em; text-transform: uppercase; color: var(--green); background: var(--green-soft); border-radius: 6px; padding: 2px 7px; }
.getplus { white-space: nowrap; }
.paywall { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 34px; align-items: center; max-width: 920px; margin: 30px auto; background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 34px; }
.paywall img { width: 100%; }
.paywall h1 { font-size: clamp(28px, 3.6vw, 40px); margin: 6px 0 10px; }
.perks { list-style: none; padding: 0; margin: 16px 0 22px; display: grid; gap: 9px; }
.perks li { position: relative; padding-left: 28px; font-weight: 550; }
.perks li::before { content: ""; position: absolute; left: 3px; top: 5px; width: 10px; height: 6px; border-left: 2.5px solid var(--brand); border-bottom: 2.5px solid var(--brand); transform: rotate(-45deg); }
@media (max-width: 720px) { .paywall { grid-template-columns: 1fr; padding: 22px; } .paywall img { width: 140px; } }
.plans { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; max-width: 920px; }
.plan-card { position: relative; background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 26px; display: flex; flex-direction: column; }
.plan-card.plus { border: 1.5px solid var(--brand); }
.plan-card .btn { margin-top: auto; }
.plan-card .muted.small { margin: 12px 0 0; }
.pc-head { display: flex; justify-content: space-between; align-items: baseline; }
.pc-head h2 { font-size: 26px; }
.price { font-family: var(--head); font-weight: 700; font-size: 34px; letter-spacing: -0.02em; }
.price small { font-size: 15px; font-weight: 600; color: var(--ink-2); }
.ribbon { position: absolute; top: -11px; left: 24px; background: var(--brand); color: #fff; font-size: 12px; font-weight: 800; letter-spacing: .04em; padding: 3px 10px; border-radius: 6px; }
@media (max-width: 720px) { .plans { grid-template-columns: 1fr; } }
.faq { max-width: 920px; background: var(--card); border: 1px solid var(--line); border-radius: 18px; overflow: hidden; }
.qa { border-top: 1px solid var(--line); }
.qa:first-child { border-top: 0; }
.qa summary { cursor: pointer; padding: 16px 20px; font-weight: 700; list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.qa summary::-webkit-details-marker { display: none; }
.qa summary::after { content: "+"; color: var(--ink-3); font-weight: 600; font-size: 20px; line-height: 1; }
.qa[open] summary::after { content: "–"; }
.qa p { margin: 0; padding: 0 20px 18px; color: var(--ink-2); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 760px) { .grid2 { grid-template-columns: 1fr; } }
.grid2 .card h3 { font-size: 19px; }
.restore { display: flex; gap: 8px; flex-wrap: wrap; }
.restore input { flex: 1 1 200px; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--line-2); font-size: 16px; }
.legal-page { max-width: 760px; margin: 0 auto; padding: 34px; }
.legal-page h1 { font-size: 38px; margin-bottom: 4px; }
.legal-page h3 { font-size: 19px; margin: 24px 0 6px; }
.legal-page p { margin: 0 0 8px; color: var(--ink-2); }

/* ---------- footer ---------- */
.foot { border-top: 1px solid var(--line); margin-top: 40px; }
.foot-in { max-width: 1240px; margin: 0 auto; padding: 26px 20px 30px; display: grid; grid-template-columns: auto 1fr; gap: 14px 30px; align-items: center; }
.foot-brand { display: flex; gap: 10px; align-items: center; }
.foot-brand .face { width: 36px; height: 36px; border-radius: 50%; overflow: hidden; background: var(--paper-2); }
.foot-brand .face img { width: 100%; transform: scale(1.9) translateY(18%); }
.foot-brand b { display: block; font-family: var(--head); }
.foot-brand small { color: var(--ink-2); }
.foot nav { display: flex; gap: 18px; flex-wrap: wrap; justify-content: flex-end; }
.foot nav a { color: var(--ink-2); text-decoration: none; font-weight: 600; font-size: 14px; }
.foot nav a:hover { color: var(--brand); }
.legal { grid-column: 1 / -1; margin: 0; color: var(--ink-3); font-size: 12.5px; }
@media (max-width: 820px) { .foot-in { grid-template-columns: 1fr; padding-bottom: 96px; } .foot nav { justify-content: flex-start; } }

/* ---------- landing ---------- */
.land-hero { border-bottom: 1px solid var(--line); }
.lh-in { max-width: 1140px; margin: 0 auto; padding: 56px 20px 40px; display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 40px; align-items: center; }
.lh-in h1 { font-size: clamp(40px, 5.6vw, 68px); margin: 10px 0 16px; }
.land-hero .hero-mrt { max-width: 440px; justify-self: center; background: var(--paper-2); border-radius: 28px; padding: 20px 20px 0; }
.hand-note { display: none; }
.land-sec { padding: 56px 0; }
.land-sec .wrap { padding-top: 0; padding-bottom: 0; }
.land-sec.alt { background: var(--card); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.land-sec h2 { font-size: clamp(28px, 3.4vw, 38px); }
.center { text-align: center; }
.steps3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 26px; }
.steps3 .card { padding: 22px; }
.steps3 h3 { font-size: 20px; margin: 10px 0 6px; }
.steps3 p { margin: 0; }
.stepn { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 8px; background: var(--brand-soft); color: var(--brand); font-family: var(--head); font-weight: 700; }
.land-feat { display: grid; grid-template-columns: 1fr 1fr; gap: 36px; align-items: center; }
.land-feat .lead { margin: 12px 0 20px; }
.feat-list { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.feat { padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--paper); font-weight: 650; font-size: 15px; }
.course-grid.land { margin-top: 26px; }
.course-grid.land .course-card { cursor: default; }
@media (max-width: 860px) {
  .lh-in, .land-feat { grid-template-columns: 1fr; }
  .land-hero .hero-mrt { max-width: 260px; order: -1; }
  .lh-in { padding-top: 26px; }
  .steps3 { grid-template-columns: 1fr; }
}
@media (max-width: 480px) { .feat-list { grid-template-columns: 1fr; } }
@media (max-width: 560px) {
  .top-right { gap: 6px; }
  .chip.streak { display: none; }
  .chip.plus { padding: 6px 8px; font-size: 0; gap: 0; }
  .chip.plus svg.i { width: 16px; height: 16px; }
  .getplus { padding: 7px 10px; font-size: 14px; }
  .switch-btn { padding: 7px 10px; }
  .today-mrt { width: 96px; }
  .today h1 { font-size: 30px; }
}
@media (max-width: 560px) { .sw-name { display: inline; } .logo { font-size: 16px; } }
.chapters .ic { color: var(--ink-2); background: var(--paper-2); font-weight: 700; }
.chapters .on .ic { color: #fff; background: var(--brand); }
.hand-btn { background: var(--card); color: #B9650B; border: 1px solid #EFC690; }
.hand-btn:hover { background: #FFF7EC; }

/* ---------- FRQ walkthroughs ---------- */
.frq-vid { display: flex; gap: 14px; align-items: center; text-decoration: none; color: var(--ink); border-color: color-mix(in srgb, var(--brand) 35%, var(--line)); background: color-mix(in srgb, var(--brand) 4%, var(--card)); padding: 16px 20px; }
.frq-vid > svg.i:first-child { width: 34px; height: 34px; padding: 8px; border-radius: 50%; background: var(--brand); color: #fff; box-sizing: content-box; }
.frq-vid span { flex: 1; } .frq-vid b { display: block; font-size: 17px; } .frq-vid small { color: var(--ink-2); }
.frq-vid > svg.i:last-child { color: var(--brand); }
.walk-btn { margin-top: 10px; }
.walk { margin-top: 12px; border-top: 1px solid var(--line); padding-top: 14px; }
.wsteps { margin: 8px 0 0; padding: 0; list-style: none; counter-reset: ws; display: grid; gap: 10px; }
.wstep { counter-increment: ws; position: relative; padding: 12px 14px 12px 50px; border: 1px solid var(--line); border-radius: 12px; background: var(--paper); }
.wstep::before { content: counter(ws); position: absolute; left: 14px; top: 12px; width: 24px; height: 24px; border-radius: 50%; background: var(--brand); color: #fff; font-weight: 700; font-size: 13px; display: grid; place-items: center; }
.ws-s { font-weight: 600; line-height: 1.45; }
.why-btn { margin-top: 8px; border: 1px solid color-mix(in srgb, var(--brand) 40%, var(--line)); background: var(--card); color: var(--brand); font-weight: 700; font-size: 14px; border-radius: 999px; padding: 4px 14px; }
.why-btn:hover { background: var(--brand-soft); }
.why-a { margin-top: 8px; padding: 10px 12px; border-left: 3px solid var(--brand); background: var(--card); border-radius: 0 10px 10px 0; color: var(--ink); font-size: 15.5px; line-height: 1.5; }
.fbd-fig { position: relative; width: min(340px, 100%); margin: 10px 0 2px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; }
.fbd-fig svg { display: block; width: 100%; height: auto; }
.fbd-l { position: absolute; transform: translate(-50%, -50%); font-weight: 700; font-size: 15px; white-space: nowrap; }
.wask { margin-top: 6px; }
.vrow-h { margin: 18px 0 10px; font-weight: 700; color: var(--ink-2); font-size: 15px; }
.vrow { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }
.vcard { display: flex; gap: 14px; align-items: center; text-decoration: none; color: var(--ink); background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; transition: border-color .12s; }
.vcard:hover { border-color: var(--brand); }
.vc-play { width: 44px; height: 44px; border-radius: 12px; background: var(--brand); color: #fff; display: grid; place-items: center; flex: 0 0 auto; }
.vcard b { display: block; font-family: var(--head); font-weight: 650; font-size: 17px; line-height: 1.25; margin: 2px 0; }
.vcard small { display: block; color: var(--ink-2); font-size: 13.5px; line-height: 1.35; }
.vcard .kicker { font-size: 11px; }
.trow-h { margin-top: 12px; padding: 10px 0 4px; border-top: 1px solid var(--line); font-size: 12px; font-weight: 750; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); }
.trow-h + .trow { border-top: 0; }
.freetag.vid { color: var(--brand); background: var(--brand-soft); margin-left: 6px; vertical-align: 2px; }
.askopt.why span { font-family: var(--head); font-weight: 800; color: var(--brand); font-size: 20px; width: 24px; text-align: center; }
.askopt.why div { font-weight: 650; }
.qa summary { display: block; position: relative; padding-right: 48px; }
.qa summary::after { position: absolute; right: 20px; top: 15px; }