/* phimaths redesign demo — local only, never deployed */
:root {
  --bg: #FFFFFF; --bg-soft: #F6F6F6; --surface: #FFFFFF; --text: #0A0A0A; --muted: #6B6B6B; --faint: #767676;
  --border: #E6E6E6; --border-strong: #0A0A0A; --ink: #0A0A0A; --on-ink: #FFFFFF;
  --accent: #0A0A0A; --on-accent: #FFFFFF;
  --radius: 14px;
  --serif: "Instrument Serif", Georgia, serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Consolas, monospace;
  --ease: cubic-bezier(.2, .7, .2, 1);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #000000; --bg-soft: #0B0B0B; --surface: #0A0A0A; --text: #F5F5F5; --muted: #929292; --faint: #7A7A7A;
    --border: #1F1F1F; --border-strong: #F5F5F5; --ink: #F5F5F5; --on-ink: #000000;
    --accent: #F5F5F5; --on-accent: #000000;
  }
}
:root[data-theme="dark"] {
  --bg: #000000; --bg-soft: #0B0B0B; --surface: #0A0A0A; --text: #F5F5F5; --muted: #929292; --faint: #7A7A7A;
  --border: #1F1F1F; --border-strong: #F5F5F5; --ink: #F5F5F5; --on-ink: #000000;
  --accent: #F5F5F5; --on-accent: #000000;
}
/* Accent options for comparison */
:root[data-accent="blue"] { --accent: #2F6BFF; --on-accent: #FFFFFF; }
:root[data-accent="green"] { --accent: #2BEA82; --on-accent: #000000; }

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 var(--sans); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
h1, h2, h3 { margin: 0 0 .5em; line-height: 1.1; }
h2 { font: 800 clamp(1.8rem, 4vw, 2.6rem)/1.08 var(--sans); letter-spacing: -.03em; }
h3 { font-size: 1.05rem; font-weight: 600; }
p { margin: 0 0 1em; }
a { color: inherit; }
button { font: inherit; color: inherit; }
::selection { background: var(--ink); color: var(--on-ink); }
:focus-visible { outline: 2px solid var(--text); outline-offset: 3px; }
.container { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 640px) { .container { padding: 0 32px; } }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.mono { font-family: var(--mono); }
.eyebrow { font: 600 .74rem var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--muted); margin-bottom: 12px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5em; padding: .8em 1.4em;
  border-radius: 12px; border: 1px solid var(--border-strong); font-weight: 600; font-size: .95rem; text-decoration: none; cursor: pointer;
  transition: transform .15s var(--ease), background .2s, color .2s, border-color .2s, box-shadow .2s;
}
.btn:active:not(:disabled) { transform: scale(.97); }
.btn:disabled { opacity: .35; cursor: not-allowed; }
.btn-primary { background: var(--ink); color: var(--on-ink); }
.btn-primary:hover:not(:disabled) { opacity: .88; }
.btn-accent { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.btn-accent:hover:not(:disabled) { box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 25%, transparent); }
.btn-ghost { background: transparent; }
.btn-ghost:hover { background: var(--bg-soft); }
.btn-lg { padding: 1em 1.6em; font-size: 1.02rem; border-radius: 14px; }
.btn-sm { padding: .5em .95em; font-size: .85rem; border-radius: 10px; }
.btn-block { width: 100%; }
.pill { display: inline-flex; align-items: center; gap: 6px; padding: .2em .7em; border-radius: 999px; border: 1px solid var(--border); font-size: .75rem; font-weight: 600; color: var(--muted); }
.pill-accent { border-color: var(--accent); color: var(--text); }
.lock { display: inline-flex; align-items: center; gap: 4px; font: 600 .7rem var(--mono); letter-spacing: .08em; text-transform: uppercase; padding: .25em .6em; border-radius: 6px; background: var(--ink); color: var(--on-ink); }
.icon { width: 18px; height: 18px; flex: none; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

/* Demo bar */
.demo-bar {
  position: fixed; left: 0; right: 0; bottom: 14px; margin: 0 auto; width: fit-content; z-index: 100; display: flex; align-items: center; gap: 6px;
  padding: 6px; border-radius: 999px; background: #111; color: #fff; border: 1px solid #333; box-shadow: 0 10px 30px rgba(0,0,0,.35);
  font-size: .78rem; max-width: calc(100vw - 20px); overflow-x: auto; scrollbar-width: none;
}
.demo-bar::-webkit-scrollbar { display: none; }
.demo-bar .tag { font: 700 .68rem var(--mono); letter-spacing: .12em; background: #fff; color: #000; padding: .35em .7em; border-radius: 999px; flex: none; }
.demo-bar a, .demo-bar button { flex: none; color: #ddd; text-decoration: none; padding: .35em .7em; border-radius: 999px; border: 0; background: none; cursor: pointer; font-size: .78rem; }
.demo-bar a:hover, .demo-bar button:hover, .demo-bar a.on { background: #2a2a2a; color: #fff; }
.demo-bar .sep { width: 1px; height: 18px; background: #333; flex: none; }
.demo-bar .swatch { width: 14px; height: 14px; border-radius: 50%; padding: 0; border: 2px solid #555; }
.demo-bar .swatch.on { border-color: #fff; }

/* Site nav */
.nav { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 85%, transparent); backdrop-filter: blur(14px); border-bottom: 1px solid var(--border); }
.nav-inner { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; }
.logo { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 8px; background: var(--ink); color: var(--on-ink); font: 400 1.5rem/1 var(--serif); padding-bottom: .375em; }
.wordmark { font-weight: 700; letter-spacing: -.02em; }
.nav-links { display: flex; gap: 22px; margin-left: auto; }
.nav-links a { text-decoration: none; color: var(--muted); font-size: .92rem; }
.nav-links a:hover { color: var(--text); }
@media (max-width: 820px) { .nav-links { display: none; } .nav-inner .login { margin-left: auto; } }

/* Landing */
.hero { padding: 72px 0 56px; position: relative; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; gap: 40px; } }
.hero h1 { font: 800 clamp(2.6rem, 6.4vw, 4.6rem)/1 var(--sans); letter-spacing: -.045em; margin-bottom: 20px; }
.hero h1 em { font: italic 400 1.04em var(--serif); letter-spacing: -.01em; }
.hero .sub { font-size: 1.12rem; color: var(--muted); max-width: 560px; }
.hero .sub strong { color: var(--text); font-weight: 600; }
.hero-ctas { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 28px; }
.hero-note { font-size: .82rem; color: var(--muted); margin-top: 14px; }
.mock-ui {
  position: relative; border: 1px solid var(--border); border-radius: 18px; background: var(--surface); padding: 22px;
  box-shadow: 0 30px 80px -30px rgba(0,0,0,.35); transform: rotate(-1.2deg); animation: float 7s ease-in-out infinite;
}
.mock-ui .chrome { display: flex; justify-content: space-between; align-items: center; font: 600 .72rem var(--mono); color: var(--muted); margin-bottom: 14px; letter-spacing: .08em; }
.mock-ui .bar { height: 4px; border-radius: 4px; background: var(--border); margin-bottom: 18px; overflow: hidden; }
.mock-ui .bar i { display: block; height: 100%; width: 35%; background: var(--accent); }
.mock-ui .opt { display: flex; gap: 12px; align-items: center; border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; margin-top: 8px; font-size: .95rem; }
.mock-ui .opt b { display: grid; place-items: center; width: 24px; height: 24px; border-radius: 6px; border: 1px solid var(--border); font-size: .75rem; }
.mock-ui .opt.sel { border-color: var(--border-strong); }
.mock-ui .opt.sel b { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
.mock-ui .float-tag { position: absolute; right: -10px; bottom: -14px; transform: rotate(3deg); background: var(--ink); color: var(--on-ink); font-size: .8rem; font-weight: 600; padding: .5em .9em; border-radius: 10px; }
@keyframes float { 50% { transform: rotate(-1.2deg) translateY(-8px); } }
.trust { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 26px 0; }
.trust p { text-align: center; color: var(--muted); font-size: .9rem; margin: 0 0 14px; }
.unis { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px 40px; }
.unis span { font: 400 1.5rem var(--serif); color: var(--text); opacity: .8; }
.trust .fine { font-size: .72rem; margin: 14px 0 0; color: var(--faint); }
.section { padding: 88px 0; }
.section.soft { background: var(--bg-soft); }
.center { text-align: center; }
.section-head { max-width: 640px; margin: 0 auto 40px; text-align: center; }
.value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
@media (max-width: 820px) { .value-grid { grid-template-columns: 1fr; } }
.value { border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; background: var(--surface); transition: transform .3s var(--ease), border-color .3s; }
.value:hover { transform: translateY(-4px); border-color: var(--border-strong); }
.value .glyph { font: 400 2.4rem/1 var(--serif); margin-bottom: 18px; display: block; }
.value p { color: var(--muted); margin: 0; }
.taster { max-width: 760px; margin: 0 auto; }
.tabs { display: inline-flex; padding: 4px; border-radius: 12px; border: 1px solid var(--border); gap: 4px; margin-bottom: 18px; }
.tab { border: 0; background: none; padding: .55em 1em; border-radius: 9px; cursor: pointer; font-weight: 600; font-size: .9rem; color: var(--muted); display: inline-flex; gap: 8px; align-items: center; }
.tab.on { background: var(--ink); color: var(--on-ink); }
.tab:disabled { cursor: not-allowed; }
.gate { margin-top: 18px; border: 1px dashed var(--border-strong); border-radius: 12px; padding: 18px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; }
.gate p { margin: 0; font-weight: 600; }
.pricing { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; max-width: 1000px; margin: 0 auto; }
@media (max-width: 900px) { .pricing { grid-template-columns: 1fr; } }
.plan { border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; display: flex; flex-direction: column; background: var(--surface); position: relative; }
.plan.best { border: 2px solid var(--accent); }
.plan .badge { position: absolute; top: -12px; left: 24px; background: var(--accent); color: var(--on-accent); font: 700 .7rem var(--mono); letter-spacing: .1em; padding: .35em .8em; border-radius: 999px; text-transform: uppercase; }
.plan .price { font: 800 2.4rem/1 var(--sans); letter-spacing: -.03em; margin: 8px 0 4px; }
.plan .per { color: var(--muted); font-size: .85rem; margin-bottom: 18px; }
.plan ul { list-style: none; padding: 0; margin: 0 0 24px; flex: 1; }
.plan li { padding: 8px 0; border-bottom: 1px solid var(--border); font-size: .92rem; display: flex; gap: 10px; }
.plan li::before { content: "✓"; font-weight: 700; }
.plan li.no { color: var(--muted); }
.plan li.no::before { content: "–"; }
.demo-flag { display: block; text-align: center; font-size: .78rem; color: var(--faint); margin-top: 16px; }
.footer { border-top: 1px solid var(--border); padding: 36px 0 90px; color: var(--muted); font-size: .85rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; }

/* Question parts (shared) */
.q-meta { display: flex; flex-wrap: wrap; gap: 6px 14px; font: 600 .72rem var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-bottom: 14px; }
.q-stem { font-size: 1.1rem; }
/* Paper 2 layouts: quoted statements, I/II/III lists and numbered proof lines */
.q-stem .q-quote { margin: 12px 0; padding: 10px 14px; border-left: 2px solid var(--border-strong); color: var(--text); }
.q-stem .q-lines { display: grid; gap: 8px; margin: 12px 0; }
.q-stem .q-lines > div { display: grid; grid-template-columns: 2.6em 1fr; align-items: baseline; }
.q-stem .q-lines .ql { font: 600 .8rem var(--mono); color: var(--muted); }
.q-stem p { margin: 10px 0 0; }
.options { display: grid; gap: 10px; }
.option {
  display: flex; align-items: center; gap: 14px; width: 100%; text-align: left; padding: 14px 16px; min-height: 56px;
  border: 1px solid var(--border); border-radius: 12px; background: var(--surface); cursor: pointer; font-size: 1rem;
  transition: border-color .15s, transform .15s var(--ease), background .15s;
}
.option:hover:not(:disabled) { border-color: var(--border-strong); transform: translateX(3px); }
.option .key { display: grid; place-items: center; width: 30px; height: 30px; flex: none; border-radius: 8px; border: 1px solid var(--border); font: 600 .82rem var(--mono); color: var(--muted); }
.option .mark { margin-left: auto; font-size: .82rem; font-weight: 600; white-space: nowrap; }
.option[aria-checked="true"] { border-color: var(--border-strong); }
.option[aria-checked="true"] .key { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
.option.correct { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
.option.correct .key { background: var(--on-ink); color: var(--ink); border-color: var(--on-ink); }
.option.wrong { border-style: dashed; border-color: var(--border-strong); color: var(--muted); }
.option.dim { opacity: .4; }
.option:disabled { cursor: default; }
.card { border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); padding: 24px; }
.result { font-weight: 700; font-size: 1.05rem; margin-bottom: 10px; }
.trap { padding: 12px 14px; border-left: 2px solid var(--border-strong); background: var(--bg-soft); border-radius: 0 10px 10px 0; font-size: .95rem; margin: 10px 0; }
.solution-steps { counter-reset: step; }
.solution-steps p { counter-increment: step; position: relative; padding-left: 34px; }
.solution-steps p::before { content: counter(step); position: absolute; left: 0; top: 1px; width: 22px; height: 22px; border-radius: 50%; border: 1px solid var(--border-strong); display: grid; place-items: center; font: 600 .72rem var(--mono); }

/* Onboarding */
.flow { min-height: calc(100vh - 64px); display: grid; place-items: start center; padding: 56px 16px 100px; }
.flow-card { width: 100%; max-width: 640px; }
.steps-dots { display: flex; gap: 6px; margin-bottom: 28px; }
.steps-dots i { height: 4px; flex: 1; border-radius: 4px; background: var(--border); }
.steps-dots i.on { background: var(--accent); }
.choice-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 14px 0 26px; }
.choice { border: 1px solid var(--border); border-radius: 12px; padding: 18px 12px; background: var(--surface); cursor: pointer; font-weight: 700; font-size: 1.05rem; text-align: center; }
.choice small { display: block; font-weight: 400; font-size: .75rem; color: var(--muted); margin-top: 4px; }
.choice.on { border: 2px solid var(--accent); }
select { font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: .7em .9em; }
.report-bars { display: grid; gap: 14px; margin: 20px 0; }
.rbar { display: grid; grid-template-columns: 150px 1fr 48px; gap: 12px; align-items: center; font-size: .92rem; }
.rbar .track { height: 10px; border-radius: 10px; background: var(--border); overflow: hidden; }
.rbar .fill { height: 100%; background: var(--ink); border-radius: 10px; width: 0; transition: width 1s var(--ease); }
.rbar .fill.weak { background: var(--accent); }
.callout { border: 1px solid var(--border-strong); border-radius: 12px; padding: 16px 18px; margin: 18px 0; }
.callout strong { display: block; font-size: 1.1rem; }

/* App shell */
.app { display: grid; grid-template-columns: 232px 1fr; min-height: 100vh; }
.side { border-right: 1px solid var(--border); padding: 20px 14px; position: sticky; top: 0; height: 100vh; display: flex; flex-direction: column; gap: 4px; }
.side .brand { padding: 4px 10px 22px; }
.side a { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border-radius: 10px; text-decoration: none; color: var(--muted); font-weight: 500; font-size: .93rem; }
.side a:hover { background: var(--bg-soft); color: var(--text); }
.side a.on { background: var(--ink); color: var(--on-ink); }
.side a .lock { margin-left: auto; font-size: .6rem; padding: .15em .45em; }
.side a.on .lock { background: var(--on-ink); color: var(--ink); }
.side .side-foot { margin-top: auto; padding: 12px; border: 1px solid var(--border); border-radius: 12px; font-size: .82rem; }
.main { padding: 32px clamp(16px, 4vw, 40px) 100px; min-width: 0; }
.main-grid { display: grid; grid-template-columns: 1fr 300px; gap: 24px; align-items: start; }
@media (max-width: 1100px) { .main-grid { grid-template-columns: 1fr; } }
@media (max-width: 820px) {
  .app { grid-template-columns: 1fr; }
  .side { position: fixed; bottom: 0; top: auto; left: 0; right: 0; height: auto; z-index: 30; flex-direction: row; justify-content: space-around; padding: 6px 6px calc(6px + env(safe-area-inset-bottom)); border-right: 0; border-top: 1px solid var(--border); background: var(--bg); }
  .side .brand, .side .side-foot, .side a span.label, .side a .lock { display: none; }
  .side a { flex-direction: column; gap: 2px; padding: 8px; font-size: .65rem; }
  .main { padding-bottom: 150px; }
  .demo-bar { bottom: 78px; }
}
.greet { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: end; gap: 12px; margin-bottom: 22px; }
.greet h1 { font: 800 clamp(1.7rem, 3.4vw, 2.3rem)/1.1 var(--sans); letter-spacing: -.03em; margin: 0; }
.stat-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-bottom: 20px; }
@media (max-width: 640px) { .stat-row { grid-template-columns: 1fr 1fr; } .stat-row .weekly { grid-column: 1 / -1; } }
.stat { border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; background: var(--surface); }
.stat .label { font-size: .8rem; color: var(--muted); display: flex; align-items: center; gap: 6px; }
.stat .num { font: 800 1.9rem/1.2 var(--sans); letter-spacing: -.02em; margin-top: 4px; }
.progress { height: 8px; border-radius: 8px; background: var(--border); overflow: hidden; margin-top: 10px; }
.progress i { display: block; height: 100%; background: var(--accent); border-radius: 8px; transition: width .8s var(--ease); }
.next-step { display: block; width: 100%; text-align: left; border-radius: 18px; padding: 30px; border: 0; cursor: pointer; background: var(--ink); color: var(--on-ink); text-decoration: none; transition: transform .2s var(--ease); }
.next-step:hover { transform: translateY(-3px); }
.next-step .k { font: 600 .74rem var(--mono); letter-spacing: .14em; text-transform: uppercase; opacity: .7; }
.next-step .t { display: block; font: 800 clamp(1.4rem, 3vw, 2rem)/1.15 var(--sans); letter-spacing: -.02em; margin: 8px 0 14px; }
.next-step .go { display: inline-flex; align-items: center; gap: 8px; background: var(--accent); color: var(--on-accent); padding: .6em 1.1em; border-radius: 10px; font-weight: 700; }
:root:not([data-accent]) .next-step .go, :root[data-accent="mono"] .next-step .go { background: var(--on-ink); color: var(--ink); }
.secondary-step { margin-top: 12px; display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.topic-list { display: grid; gap: 10px; }
.topic-row { display: grid; grid-template-columns: 1fr 120px 40px; gap: 12px; align-items: center; font-size: .9rem; }
.panel h3 { display: flex; justify-content: space-between; align-items: center; }
.board { list-style: none; padding: 0; margin: 0; }
.board li { display: grid; grid-template-columns: 24px 1fr auto; gap: 10px; padding: 9px 0; border-bottom: 1px solid var(--border); font-size: .9rem; align-items: center; }
.board li.me { font-weight: 700; }
.board .rank { font: 600 .8rem var(--mono); color: var(--muted); }
.locked-wrap { position: relative; border-radius: var(--radius); overflow: hidden; }
.locked-wrap .blurred { filter: blur(6px); opacity: .5; pointer-events: none; user-select: none; }
.locked-wrap .unlock { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; padding: 20px; }
.locked-wrap .unlock > div { max-width: 360px; background: var(--surface); border: 1px solid var(--border-strong); border-radius: 14px; padding: 22px; }

/* Practice (focus mode) */
.focus { min-height: 100vh; display: flex; flex-direction: column; }
.focus-top { position: sticky; top: 0; z-index: 10; background: var(--bg); border-bottom: 1px solid var(--border); }
.focus-top-inner { display: flex; align-items: center; gap: 14px; height: 60px; }
.icon-btn { display: inline-grid; place-items: center; width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--border); background: transparent; cursor: pointer; text-decoration: none; }
.icon-btn:hover { border-color: var(--border-strong); }
.icon-btn.on { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
.qcount { font: 600 .85rem var(--mono); }
.qprog { flex: 1; height: 4px; background: var(--border); border-radius: 4px; overflow: hidden; max-width: 420px; }
.qprog i { display: block; height: 100%; background: var(--accent); transition: width .4s var(--ease); }
.timer { font: 600 .85rem var(--mono); font-variant-numeric: tabular-nums; padding: .35em .8em; border-radius: 999px; border: 1px solid var(--border); min-width: 76px; text-align: center; }
.timer.over { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
.timer.hide { color: transparent; text-shadow: 0 0 8px var(--muted); }
.free-left { font-size: .78rem; color: var(--muted); white-space: nowrap; }
.focus-body { flex: 1; display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
.focus-body > section { padding: 36px clamp(16px, 4vw, 48px) 120px; min-width: 0; }
.focus-body .q-col { border-right: 1px solid var(--border); }
.focus-body .q-col .q-stem { font-size: 1.22rem; line-height: 1.65; }
@media (max-width: 900px) { .focus-body { grid-template-columns: 1fr; } .focus-body .q-col { border-right: 0; border-bottom: 1px solid var(--border); padding-bottom: 28px; } .focus-body > section { padding-bottom: 28px; } .focus-body .a-col { padding-bottom: 150px; } }
.scratch { margin-top: 28px; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.scratch-bar { display: flex; align-items: center; gap: 8px; padding: 8px 10px; border-bottom: 1px solid var(--border); font-size: .82rem; color: var(--muted); }
.scratch-bar .spacer { flex: 1; }
.scratch canvas { display: block; width: 100%; height: 260px; touch-action: none; cursor: crosshair; background:
  radial-gradient(circle, var(--border) 1px, transparent 1.4px) 0 0 / 20px 20px; }
.paper-note { margin-top: 18px; font-size: .85rem; color: var(--muted); display: flex; gap: 8px; align-items: center; }
.a-actions { display: flex; gap: 10px; margin-top: 18px; }
.details { border: 1px solid var(--border); border-radius: 12px; margin-top: 14px; }
.details summary { cursor: pointer; padding: 14px 16px; font-weight: 700; list-style: none; display: flex; justify-content: space-between; }
.details summary::-webkit-details-marker { display: none; }
.details summary::after { content: "+"; font-weight: 400; font-size: 1.2rem; line-height: 1; }
.details[open] summary::after { content: "−"; }
.details .inner { padding: 0 16px 6px; }
.feedback-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 14px; font-size: .88rem; color: var(--muted); }
.thumb { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--border); border-radius: 999px; padding: .35em .8em; background: none; cursor: pointer; font-size: .85rem; }
.thumb.on { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
.tutor { margin-top: 14px; display: flex; gap: 10px; align-items: center; justify-content: space-between; border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; font-size: .9rem; }
.sticky-act { }
@media (max-width: 900px) {
  .sticky-act { position: fixed; left: 0; right: 0; bottom: 0; z-index: 20; padding: 12px 16px calc(12px + env(safe-area-inset-bottom)); background: color-mix(in srgb, var(--bg) 90%, transparent); backdrop-filter: blur(12px); border-top: 1px solid var(--border); margin: 0; }
  .sticky-act .btn { flex: 1; }
  .focus .demo-bar { bottom: 84px; }
}

/* Modal */
.modal { border: 1px solid var(--border-strong); border-radius: 18px; padding: 28px; max-width: 440px; width: calc(100% - 32px); background: var(--surface); color: var(--text); }
.modal::backdrop { background: rgba(0, 0, 0, .55); backdrop-filter: blur(3px); }
.modal h3 { font: 800 1.4rem/1.2 var(--sans); letter-spacing: -.02em; }
.modal .row { display: flex; gap: 10px; margin-top: 20px; flex-wrap: wrap; }

.fade-in { animation: fadeIn .45s var(--ease) both; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }

/* Weekly activity chart (dashboard side panel) */
.week-chart { display: flex; align-items: flex-end; gap: 8px; height: 110px; margin-top: 8px; }
.wc-col { flex: 1; height: 100%; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; gap: 6px; }
.wc-col span { font: 600 .7rem var(--mono); color: var(--muted); }
.wc-bar { width: 100%; border-radius: 6px 6px 2px 2px; background: var(--border); transition: height .6s var(--ease); }
.wc-bar.today { background: var(--accent); }
/* ===== v2: lead-first landing, follow-ups, Quick Fire, Progress ===== */
.hero2 { padding: 40px 0 56px; }
.hero2 .hero-grid { grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
@media (max-width: 900px) { .hero2 { padding: 20px 0 40px; } .hero2 .hero-grid { grid-template-columns: 1fr; gap: 18px; } }
.hero2 h1 { font: 800 clamp(2.1rem, 5.6vw, 4.2rem)/1.02 var(--sans); letter-spacing: -.045em; margin: 10px 0 14px; }
.hero2 .sub { font-size: 1.05rem; }
@media (max-width: 900px) { .hero2 .sub { font-size: .98rem; margin-bottom: 0; } .hero2 .hero-note { display: none; } }
.live-q { border: 1px solid var(--border-strong); border-radius: 18px; padding: 20px; background: var(--surface); }
.live-q .lq-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; font: 600 .72rem var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.live-q .lq-head .dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); margin-right: 8px; vertical-align: 1px; }
.live-q .q-stem { font-size: 1.05rem; }
.live-q .options { gap: 8px; }
.live-q .option { min-height: 48px; padding: 10px 14px; }
.followup-box { margin-top: 14px; padding: 14px 16px; border-radius: 12px; border: 1px solid var(--border-strong); display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; }
.followup-box .fu-k { display: block; font: 600 .7rem var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); }
.followup-box strong { display: block; }
.method-line { font-size: .88rem; color: var(--muted); margin: 0 0 10px; }
.method-line strong { color: var(--text); }
.lead { margin-top: 16px; border-radius: 14px; padding: 18px; background: var(--ink); color: var(--on-ink); }
.lead h3 { margin: 0 0 4px; font-size: 1.1rem; }
.lead p { margin: 0 0 12px; font-size: .9rem; opacity: .8; }
.lead form { display: flex; gap: 8px; flex-wrap: wrap; }
.lead input[type="email"] { flex: 1 1 200px; min-width: 0; font: inherit; padding: .75em .9em; border-radius: 10px; border: 1px solid color-mix(in srgb, var(--on-ink) 30%, transparent); background: transparent; color: var(--on-ink); }
.lead input[type="email"]::placeholder { color: color-mix(in srgb, var(--on-ink) 50%, transparent); }
.lead .fine { font-size: .74rem; opacity: .65; margin: 10px 0 0; }
.lead .later { background: none; border: 0; color: inherit; opacity: .7; text-decoration: underline; cursor: pointer; font-size: .85rem; padding: 0; }
.lead.done { text-align: left; }
.loop { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; counter-reset: loop; }
@media (max-width: 820px) { .loop { grid-template-columns: 1fr; } }
.loop .step { border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; background: var(--surface); position: relative; }
.loop .step::before { counter-increment: loop; content: "0" counter(loop); font: 400 2.2rem/1 var(--serif); display: block; margin-bottom: 14px; }
.loop .step p { color: var(--muted); margin: 0; }
.quick-teaser { display: grid; grid-template-columns: 1.2fr .8fr; gap: 28px; align-items: center; }
@media (max-width: 820px) { .quick-teaser { grid-template-columns: 1fr; } }
.phone-stack { position: relative; height: 300px; }
.phone-stack .qcard { position: absolute; left: 50%; width: 240px; height: 260px; border-radius: 22px; border: 1px solid var(--border-strong); background: var(--surface); padding: 18px; transform: translateX(-50%); font-size: .9rem; }
.phone-stack .qcard:nth-child(1) { top: 30px; transform: translateX(-50%) scale(.86); opacity: .4; }
.phone-stack .qcard:nth-child(2) { top: 15px; transform: translateX(-50%) scale(.93); opacity: .7; }
.phone-stack .qcard:nth-child(3) { top: 0; }
.phone-stack .chip-m { display: block; margin-top: 8px; padding: .5em .7em; border: 1px solid var(--border); border-radius: 8px; font-size: .78rem; }

/* Quick Fire feed */
.feed { height: 100vh; height: 100dvh; overflow-y: auto; scroll-snap-type: y mandatory; overscroll-behavior: contain; }
.feed-top { position: fixed; top: 0; left: 0; right: 0; z-index: 15; display: flex; align-items: center; gap: 12px; padding: 12px 16px; background: linear-gradient(var(--bg), color-mix(in srgb, var(--bg) 0%, transparent)); }
.feed-top .dots { display: flex; gap: 4px; flex: 1; max-width: 360px; }
.feed-top .dots i { flex: 1; height: 4px; border-radius: 4px; background: var(--border); }
.feed-top .dots i.done { background: var(--ink); }
.feed-top .dots i.now { background: var(--accent); }
.fcard { height: 100vh; height: 100dvh; scroll-snap-align: start; scroll-snap-stop: always; display: grid; place-items: center; padding: 70px 16px 90px; }
.fcard-inner { width: 100%; max-width: 560px; }
.fcard .kind { display: inline-flex; gap: 6px; align-items: center; font: 600 .72rem var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin-bottom: 14px; }
.fcard .q-stem { font-size: 1.15rem; margin-bottom: 18px; }
.fcard .reveal-box { margin-top: 14px; }
.fcard .swipe-hint { margin-top: 18px; text-align: center; font-size: .8rem; color: var(--muted); }
.fcard.summary .big { font: 800 clamp(2.2rem, 7vw, 3.4rem)/1 var(--sans); letter-spacing: -.04em; margin: 8px 0 12px; }
.method-pills { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 18px; }
.method-pills span { border: 1px dashed var(--border-strong); border-radius: 999px; padding: .35em .8em; font-size: .82rem; }

/* Progress: method mastery */
.mastery { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 8px; }
.mcell { border-radius: 10px; padding: 10px 12px; font-size: .84rem; border: 1px solid var(--border); display: flex; justify-content: space-between; gap: 10px; align-items: center; }
.mcell .st { font: 600 .66rem var(--mono); letter-spacing: .08em; text-transform: uppercase; white-space: nowrap; color: var(--muted); }
.mcell.got { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
.mcell.got .st { color: inherit; opacity: .75; }
.mcell.work { border-style: dashed; border-color: var(--border-strong); }
.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: .8rem; color: var(--muted); margin: 0 0 14px; }
.legend i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; border: 1px solid var(--border); }
.legend i.got { background: var(--ink); border-color: var(--ink); }
.legend i.work { border: 1px dashed var(--border-strong); }

/* Progress */
.pg .card { margin-bottom: 16px; }
.pg-hero { display: grid; grid-template-columns: auto 1fr; gap: clamp(18px, 4vw, 40px); align-items: center; }
.pg-ring { position: relative; width: clamp(130px, 22vw, 170px); aspect-ratio: 1; }
.pg-ring svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.pg-ring circle { fill: none; stroke-width: 10; }
.pg-ring .trk { stroke: var(--border); }
.pg-ring .val { stroke: var(--accent); stroke-linecap: round; transition: stroke-dashoffset 1.1s var(--ease); }
@media (prefers-reduced-motion: reduce) { .pg-ring .val { transition: none; } }
.pg-ring-txt { position: absolute; inset: 0; display: grid; place-content: center; text-align: center; }
.pg-ring-txt strong { font: 400 clamp(2.2rem, 5vw, 2.9rem)/1 var(--serif); }
.pg-ring-txt span { font: 600 .68rem var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--muted); margin-top: 4px; }
.pg-mood { font-size: 1.05rem; margin: 0 0 16px; max-width: 520px; }
.pg-mini { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-bottom: 18px; }
.pg-mini > div { display: flex; flex-direction: column; gap: 2px; }
.pg-mini .k { font-size: .75rem; color: var(--muted); }
.pg-mini strong { font: 800 1.15rem var(--sans); letter-spacing: -.01em; display: flex; align-items: center; gap: 2px; }
.pg-mini strong.lit { color: #ff7a00; }
.pg-mini .sub { font-size: .72rem; color: var(--faint); }
.pg-week { display: grid; grid-template-columns: repeat(7, 1fr); gap: 8px; height: 74px; max-width: 360px; }
.pg-day { display: flex; flex-direction: column; justify-content: flex-end; align-items: center; gap: 6px; }
.pg-day i { width: 100%; max-width: 26px; border-radius: 6px 6px 3px 3px; background: color-mix(in srgb, var(--text) 22%, transparent); transition: height .6s var(--ease); }
.pg-day.today i { background: var(--accent); }
.pg-day span { font: 600 .66rem var(--mono); color: var(--muted); }
@media (max-width: 700px) { .pg-hero { grid-template-columns: 1fr; justify-items: center; text-align: center; } .pg-mini { grid-template-columns: repeat(2, 1fr); text-align: left; } .pg-week { margin: 0 auto; } }
.pg-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 14px; }
.pg-head h3 { margin: 0; }
.pg-moves { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; }
.pg-move { display: grid; grid-template-columns: 1fr auto; grid-template-rows: auto auto; gap: 6px 10px; padding: 14px 16px; border: 1px solid var(--border); border-radius: 12px; color: inherit; text-decoration: none; transition: border-color .15s, transform .15s var(--ease); }
.pg-move:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.pg-move .tag { font: 600 .66rem var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.pg-move .tag.fix { color: var(--text); }
.pg-move .name { grid-column: 1; font-weight: 700; line-height: 1.3; }
.pg-move .go { grid-row: 1 / 3; grid-column: 2; align-self: center; opacity: .6; }
.pg-topics { display: grid; gap: 6px; }
.pg-topic summary { display: grid; grid-template-columns: minmax(120px, 210px) 1fr 3.2em; gap: 14px; align-items: center; padding: 9px 4px; cursor: pointer; list-style: none; border-radius: 8px; }
.pg-topic summary::-webkit-details-marker { display: none; }
.pg-topic summary:hover { background: var(--bg-soft); }
.pg-topic .nm { font-weight: 600; font-size: .95rem; }
.pg-topic .seg { display: flex; gap: 3px; height: 10px; }
.pg-topic .seg i { border-radius: 4px; min-width: 0; }
.pg-topic .seg .g { background: var(--ink); }
.pg-topic .seg .w { background: repeating-linear-gradient(135deg, var(--text) 0 2px, transparent 2px 5px); border: 1px solid var(--border-strong); }
.pg-topic .seg .f { background: var(--border); }
.pg-topic .ct { font: 600 .82rem var(--mono); text-align: right; color: var(--muted); }
.pg-chips { display: flex; flex-wrap: wrap; gap: 8px; padding: 6px 4px 14px; }
.pg-chip { font-size: .82rem; padding: .35em .8em; border-radius: 999px; border: 1px solid var(--border); color: inherit; text-decoration: none; }
.pg-chip:hover { border-color: var(--border-strong); }
.pg-chip.got { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
.pg-chip.work { border-style: dashed; border-color: var(--border-strong); }
@media (max-width: 560px) { .pg-topic summary { grid-template-columns: 1fr 3em; } .pg-topic .seg { grid-column: 1 / -1; order: 3; } }
.pg-two { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.pg-two .card { margin-bottom: 0; }
@media (max-width: 900px) { .pg-two { grid-template-columns: 1fr; } }
.pg-mocks { display: flex; align-items: flex-end; gap: 8px; height: 110px; }
.pg-mock { flex: 1; max-width: 46px; height: 100%; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; gap: 4px; color: inherit; text-decoration: none; }
.pg-mock i { width: 100%; background: var(--ink); border-radius: 6px 6px 3px 3px; }
.pg-mock:last-child i { background: var(--accent); }
.pg-mock span { font: 600 .66rem var(--mono); color: var(--muted); }
.pg-badges { display: flex; flex-wrap: wrap; gap: 8px; }
.pg-badge { font-size: .8rem; padding: .35em .75em; border-radius: 999px; border: 1px dashed var(--border); color: var(--faint); }
.pg-badge.ok { border-style: solid; border-color: var(--border-strong); color: var(--text); font-weight: 600; }

/* Mock exams */
.mock-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 14px; margin-top: 18px; }
.mock-start { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.mock-hist { display: grid; gap: 8px; }
.mock-hist a { display: grid; grid-template-columns: 1fr auto auto; gap: 14px; align-items: center; padding: 10px 14px; border: 1px solid var(--border); border-radius: 10px; color: inherit; text-decoration: none; }
.mock-hist a:hover { border-color: var(--border-strong); }
.exam .focus-body > section { padding-bottom: 110px; }
.exam-bar { position: fixed; left: 0; right: 0; bottom: 0; z-index: 10; background: var(--bg); border-top: 1px solid var(--border); }
.exam-bar-inner { display: flex; gap: 10px; align-items: center; height: 68px; }
.exam-bar .spacer { flex: 1; }
.exam-bar .flag-on { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
@media (max-width: 560px) { .exam-bar-inner { gap: 6px; } .exam-bar .btn { padding: .6em .8em; font-size: .85rem; } .exam .focus-top-inner .qprog { display: none; } .exam .qcount .long, .exam #nav-open .lbl { display: none; } .exam .focus-top-inner { justify-content: space-between; } }
.nav-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(42px, 1fr)); gap: 8px; margin: 14px 0 12px; }
.nav-cell { position: relative; height: 42px; border: 1px solid var(--border); border-radius: 10px; background: transparent; color: var(--text); font: 600 .85rem var(--mono); cursor: pointer; }
.nav-cell:hover { border-color: var(--border-strong); }
.nav-cell.ans { background: var(--ink); color: var(--on-ink); border-color: var(--ink); }
.nav-cell.flg::after { content: "⚑"; position: absolute; top: -7px; right: -5px; font-size: .75rem; color: var(--accent); background: var(--surface); border-radius: 50%; line-height: 1; padding: 1px; }
.nav-cell.cur { outline: 2px solid var(--accent); outline-offset: 2px; }
.legend i.ans { background: var(--ink); border-color: var(--ink); }
.legend i.flg { border-color: var(--accent); }
.modal:has(.nav-grid) { max-width: 560px; }
.mock-review { display: grid; gap: 8px; }
.mr { border: 1px solid var(--border); border-radius: 12px; }
.mr summary { display: grid; grid-template-columns: 2.2em 1fr auto 1.6em; gap: 10px; align-items: center; padding: 10px 14px; cursor: pointer; list-style: none; }
.mr summary::-webkit-details-marker { display: none; }
.mr .mr-n { font: 600 .85rem var(--mono); color: var(--muted); }
.mr .mr-s { font-weight: 700; text-align: center; }
.mr.bad { border-style: dashed; border-color: var(--border-strong); }
.mr.blank { opacity: .75; }
.mr .mr-body { padding: 4px 16px 16px; border-top: 1px solid var(--border); }
.mr .sol { padding-left: 1.2em; margin: 10px 0 14px; }
.mr .sol li { margin: 6px 0; }
.estimate { border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.estimate .bar { height: 8px; border-radius: 8px; background: var(--border); overflow: hidden; margin: 10px 0 6px; }
.estimate .bar i { display: block; height: 100%; background: var(--ink); }
/* Exam track switcher (sidebar) */
.track-switch { display: flex; align-items: center; justify-content: space-between; width: 100%; margin: -8px 0 12px; padding: 9px 12px; border-radius: 10px; border: 1px solid var(--border-strong); background: transparent; font-weight: 700; font-size: .9rem; cursor: pointer; }
.track-switch:hover { background: var(--bg-soft); }
@media (max-width: 820px) { .side .track-switch { display: none; } }
/* In black-and-white mode the lead box is ink-coloured, so invert its button. */
:root:not([data-accent]) .lead .btn-accent { background: var(--on-ink); color: var(--ink); border-color: var(--on-ink); }
/* ===== Maths look: dot field, floating formulas, graph paper ===== */
.math-hero { position: relative; overflow: hidden; }
.math-hero .field { position: absolute; inset: 0; width: 100%; height: 100%; display: block; cursor: crosshair; }
.math-hero::after { /* keeps the copy readable over the field */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse 55% 70% at 22% 45%, color-mix(in srgb, var(--bg) 85%, transparent) 0%, transparent 75%);
}
.math-hero .hero-grid { position: relative; z-index: 2; }
.math-hero .live-q { box-shadow: 0 30px 80px -40px rgba(0,0,0,.6); }
.formulas { position: absolute; inset: 0; z-index: 1; pointer-events: none; --px: 0; --py: 0; }
.formula {
  position: absolute; white-space: nowrap; color: var(--text); opacity: .22; font-size: clamp(.8rem, 1.4vw, 1.05rem);
  transform: translate(calc(var(--px) * var(--d) * -26px), calc(var(--py) * var(--d) * -26px));
  transition: transform .5s var(--ease); animation: drift 9s ease-in-out infinite;
}
@keyframes drift { 50% { margin-top: -10px; } }
@media (max-width: 900px) { .formula { opacity: .14; font-size: .78rem; } }
.formulas, .formula, .math-hero .field, .math-hero .field-hint { -webkit-user-select: none; user-select: none; }
.hero2.solo { padding: 96px 0 110px; }
.hero2.solo .hero-grid { grid-template-columns: minmax(0, 660px); }
@media (max-width: 900px) { .hero2.solo { padding: 48px 0 64px; } }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-top: 26px; }
.gsi-slot { min-height: 44px; min-width: 220px; }
.side-foot .who { display: flex; gap: 10px; align-items: center; }
.avatar { width: 28px; height: 28px; border-radius: 50%; flex: none; display: inline-grid; place-items: center; background: var(--ink); color: var(--on-ink); font-weight: 700; object-fit: cover; }
.lead .or { margin: 10px 0; font-size: .78rem; opacity: .6; }
/* Active streak: a flickering flame */
.fire { width: 1.5em; height: 2em; vertical-align: -.55em; margin-right: 2px; overflow: visible; }
.fire .fire-outer { transform-origin: 50% 100%; animation: flame 1.6s ease-in-out infinite alternate; filter: drop-shadow(0 0 4px rgba(255, 110, 0, .55)); }
.fire .fire-inner { transform-origin: 50% 100%; animation: flame-in 1.1s ease-in-out infinite alternate; }
@keyframes flame { 0% { transform: scale(1, 1) skewX(0); } 35% { transform: scale(.96, 1.05) skewX(-2deg); } 70% { transform: scale(1.03, .97) skewX(2deg); } 100% { transform: scale(.98, 1.06) skewX(-1deg); } }
@keyframes flame-in { 0% { transform: scale(1, 1); opacity: .95; } 50% { transform: scale(.9, 1.1) translateX(.4px); opacity: 1; } 100% { transform: scale(1.05, .92) translateX(-.4px); opacity: .85; } }
@media (prefers-reduced-motion: reduce) { .fire .fire-outer, .fire .fire-inner { animation: none; } }
.stat.lit .num { color: #ff7a00; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 100; padding: 10px 16px; border-radius: 999px; background: var(--ink); color: var(--on-ink); font-size: .9rem; box-shadow: 0 10px 30px -10px rgba(0,0,0,.5); }
.math-em { font: italic 400 1.05em var(--serif); letter-spacing: -.01em; }
.math-hero .field-hint { position: absolute; left: 50%; bottom: 10px; transform: translateX(-50%); z-index: 2; margin: 0; font: 500 .66rem var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--faint); pointer-events: none; white-space: nowrap; }
@media (hover: none) { .math-hero .field-hint { display: none; } }

/* Graph-paper sections */
.section.graph {
  background-image:
    linear-gradient(color-mix(in srgb, var(--text) 6%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--text) 6%, transparent) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-mask-image: linear-gradient(transparent, #000 12%, #000 88%, transparent);
          mask-image: linear-gradient(transparent, #000 12%, #000 88%, transparent);
}
.qed { font-size: .9em; color: var(--text); margin-left: 4px; }


/* Exam countdown + plan (dashboard) */
.exam-clock { border-radius: 18px; padding: 22px; margin-bottom: 16px; border: 1px solid var(--border-strong); background: var(--surface); }
.exam-clock.empty { display: flex; gap: 14px; align-items: center; justify-content: space-between; flex-wrap: wrap; border-style: dashed; }
.ec-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.ec-digits { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 16px; }
.ec-digits div { border: 1px solid var(--border); border-radius: 12px; padding: 12px 6px; text-align: center; background: var(--bg); }
.ec-digits b { display: block; font: 800 clamp(1.6rem, 5vw, 2.6rem)/1 var(--mono); font-variant-numeric: tabular-nums; letter-spacing: -.03em; }
.ec-digits span { display: block; margin-top: 6px; font: 600 .66rem var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.ec-approx, .ec-now { font: 800 clamp(1.8rem, 5vw, 2.6rem)/1.1 var(--sans); letter-spacing: -.03em; margin-bottom: 8px; }
.ec-phases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; margin-bottom: 12px; }
.ec-phases span { text-align: center; font-size: .75rem; padding: .45em .3em; border-radius: 8px; border: 1px solid var(--border); color: var(--muted); }
.ec-phases span.done { border-style: dashed; }
.ec-phases span.on { background: var(--ink); color: var(--on-ink); border-color: var(--ink); font-weight: 600; }
.ec-tip { margin: 0; font-size: .92rem; color: var(--muted); }
.ec-tip strong { color: var(--text); }
.days-chip { display: flex; align-items: center; gap: 8px; margin: -4px 0 12px; padding: 8px 12px; border-radius: 10px; background: var(--bg-soft); font-size: .82rem; font-weight: 600; }
@media (max-width: 820px) { .side .days-chip { display: none; } }