/* MindBuff website. Tokens mirror src/design/tokens.ts; see docs/DESIGN_SYSTEM.md. */
@font-face { font-family: "Plus Jakarta Sans"; font-weight: 500; font-display: swap; src: url("fonts/PlusJakartaSans_500Medium.woff2") format("woff2"); }
@font-face { font-family: "Plus Jakarta Sans"; font-weight: 600; font-display: swap; src: url("fonts/PlusJakartaSans_600SemiBold.woff2") format("woff2"); }
@font-face { font-family: "Plus Jakarta Sans"; font-weight: 700; font-display: swap; src: url("fonts/PlusJakartaSans_700Bold.woff2") format("woff2"); }
@font-face { font-family: "Plus Jakarta Sans"; font-weight: 800; font-display: swap; src: url("fonts/PlusJakartaSans_800ExtraBold.woff2") format("woff2"); }

:root {
  --bg: #FBF7F3;
  --surface: #FFFFFF;
  --surface-warm: #FFF5F1;
  --border: #F0E8E3;
  --track: #F1EBE7;
  --text: #1D1918;
  --text-secondary: #5A5350;
  --text-muted: #7A7270;
  --primary: #EB6347;
  --primary-strong: #E8482C;
  --primary-soft: #FFE8DF;
  --coral-700: #C53920;
  --success: #628A5A;
  --warning: #DB7F22;

  --memory-softer: #FFF5F1; --memory-soft: #FFE8DF; --memory: #EB6347;
  --logic-softer: #F3F7F0; --logic-soft: #E5EEDF; --logic: #7FA275;
  --creativity-softer: #FFF7EC; --creativity-soft: #FFEBD1; --creativity: #F39A3D;
  --riddles-softer: #FFF2F4; --riddles-soft: #FDE2E7; --riddles: #E8607A;
  --knowledge-softer: #F0F6F5; --knowledge-soft: #DDEDEA; --knowledge: #5E9C93;
  --flags-softer: #FFF7F2; --flags-soft: #FFE6D6; --flags: #F28A5B;
  --math-softer: #F9F4FB; --math-soft: #EFE2F4; --math: #A06BB8;
  --focus-softer: #F2F7FB; --focus-soft: #DDEBF6; --focus: #4F93C9;
  --danger: #E2483D;

  /* Smooth and solid, like chess.com: flat colors, no gradients or glows. Cards
     sit on a thin solid ledge and coral buttons on a darker coral lip. */
  --card-edge: #F0E8E3;
  --ledge: #E9DDD5;
  --lip: #C53920;

  --radius-sm: 10px; --radius-md: 12px; --radius-lg: 14px; --radius-xl: 18px; --radius-button: 14px; --radius-pill: 999px;
  --shadow-card: 0 3px 0 var(--ledge);
  --shadow-raised: 0 4px 0 var(--lip);

  --font: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --gutter: 20px;
  --max: 1080px;
}

/* Dark: the app's neutral dark-grey theme (DARK, DARK_TINT in tokens.ts). Follows the visitor's system setting. */
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #1B1B1C; --surface: #262628; --surface-warm: #2E2E30; --border: #38383B; --track: #3A3A3D;
    --text: #F4F4F5; --text-secondary: #C4C4C8; --text-muted: #9A9A9F;
    --primary: #EB6347; --primary-strong: #FF8F74; --primary-soft: #43271F; --coral-700: #FFAA93;
    --card-edge: #323235; --ledge: #0F0F10; --lip: #C53920;
    --success: #93C088; --warning: #F7AE5C; --danger: #FF6E61;
    --memory-softer: #2A1C19; --memory-soft: #47261F; --memory: #EB6347;
    --logic-softer: #1C231A; --logic-soft: #2C3829; --logic: #8DB083;
    --creativity-softer: #2A2016; --creativity-soft: #45331C; --creativity: #F39A3D;
    --riddles-softer: #2A191D; --riddles-soft: #47252D; --riddles: #E8607A;
    --knowledge-softer: #17211F; --knowledge-soft: #233733; --knowledge: #6FB0A6;
    --flags-softer: #2B1D17; --flags-soft: #4A2E22; --flags: #F28A5B;
    --math-softer: #231A27; --math-soft: #3A2943; --math: #B98BCF;
    --focus-softer: #16212A; --focus-soft: #213648; --focus: #74AEDB;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { animation: none !important; transition: none !important; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 500 16px/1.55 var(--font);
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--primary-strong); text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
a:hover { color: var(--coral-700); }
:focus-visible { outline: 3px solid var(--primary); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3 { margin: 0; font-weight: 800; letter-spacing: -0.02em; line-height: 1.15; text-wrap: balance; }
p { margin: 0; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 14px; border-radius: var(--radius-pill); z-index: 10; }
.skip:focus { left: 8px; }

/* Header */
.site-header { padding: 18px 0; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 800; font-size: 20px; letter-spacing: -0.02em; }
.brand img { width: 36px; height: 36px; }
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a { color: var(--text-secondary); text-decoration: none; font-weight: 600; font-size: 15px; padding: 8px 12px; border-radius: var(--radius-pill); }
.nav a:hover, .nav a[aria-current="page"] { color: var(--primary-strong); background: var(--primary-soft); }

/* Buttons and pills */
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 14px 22px; border-radius: var(--radius-button); font-weight: 700; font-size: 16px; text-decoration: none; transition: transform .15s ease; }
.btn:active { transform: scale(.97); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: var(--shadow-raised); }
.btn-primary:hover { color: #fff; }
.btn-secondary { background: var(--primary-soft); color: var(--primary-strong); }
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 6px 12px; border-radius: var(--radius-pill); background: var(--surface-warm); color: var(--primary-strong); font-weight: 700; font-size: 13px; }
.chev { width: 18px; height: 18px; }

/* Hero */
.hero { padding: 32px 0 72px; }
.hero .wrap { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.hero h1 { font-size: clamp(40px, 6vw, 64px); letter-spacing: -0.035em; margin-top: 18px; }
.hero h1 em { font-style: normal; color: var(--primary); }
.hero .lead { margin-top: 20px; font-size: 19px; color: var(--text-secondary); max-width: 34ch; }
.hero .ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.store-note { margin-top: 14px; color: var(--text-muted); font-size: 14px; }

.stack { position: relative; display: grid; gap: 16px; max-width: 420px; justify-self: center; width: 100%; }
.card { background: var(--surface); border: 1px solid var(--card-edge); border-radius: var(--radius-lg); box-shadow: var(--shadow-card); padding: 22px; }
.riddle-card { background: var(--surface-warm); border: 1px solid var(--card-edge); border-radius: var(--radius-xl); padding: 26px; box-shadow: var(--shadow-card); }
.riddle-card .q { font-size: 23px; font-weight: 800; letter-spacing: -0.02em; line-height: 1.25; margin-top: 12px; }
.riddle-card .lock { display: flex; align-items: center; gap: 10px; margin-top: 18px; color: var(--text-secondary); font-weight: 600; font-size: 14px; }
.level-card { display: flex; align-items: center; gap: 18px; transform: translateX(-18px) rotate(-1.5deg); }
.ring { width: 84px; height: 84px; flex: none; }
.level-card .t1 { color: var(--text-secondary); font-size: 13px; }
.level-card .t2 { font-size: 20px; font-weight: 800; letter-spacing: -0.02em; }
.level-card .t3 { color: var(--text-muted); font-size: 13px; }
.streak-card { display: flex; align-items: center; justify-content: space-between; gap: 16px; transform: translateX(22px) rotate(1.5deg); }
.dots { display: flex; gap: 6px; }
.dots span { width: 14px; height: 14px; border-radius: 50%; background: var(--track); }
.dots span.on { background: var(--primary); }
.streak-card b { font-size: 22px; font-weight: 800; }

/* Sections */
section { padding: 64px 0; }
.eyebrow { color: var(--primary-strong); font-weight: 700; font-size: 14px; letter-spacing: .02em; }
.section-title { font-size: clamp(30px, 4vw, 42px); margin-top: 8px; }
.section-lead { color: var(--text-secondary); font-size: 18px; margin-top: 12px; max-width: 52ch; }

.skills { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 36px; }
.skill { border-radius: var(--radius-lg); padding: 22px; background: var(--surface); border: 1px solid var(--card-edge); box-shadow: var(--shadow-card); }
.skill h3 { font-size: 18px; margin-top: 16px; letter-spacing: -0.01em; }
.skill p { color: var(--text-secondary); font-size: 15px; margin-top: 6px; }
.tile { width: 52px; height: 52px; border-radius: 12px; display: grid; place-items: center; background: var(--tile); color: var(--hue); }
.tile svg { width: 28px; height: 28px; position: relative; }
.s-memory { --wash: var(--memory-softer); --tile: var(--memory-soft); --hue: var(--memory); }
.s-logic { --wash: var(--logic-softer); --tile: var(--logic-soft); --hue: var(--logic); }
.s-creativity { --wash: var(--creativity-softer); --tile: var(--creativity-soft); --hue: var(--creativity); }
.s-riddles { --wash: var(--riddles-softer); --tile: var(--riddles-soft); --hue: var(--riddles); }
.s-knowledge { --wash: var(--knowledge-softer); --tile: var(--knowledge-soft); --hue: var(--knowledge); }
.s-flags { --wash: var(--flags-softer); --tile: var(--flags-soft); --hue: var(--flags); }
.s-math { --wash: var(--math-softer); --tile: var(--math-soft); --hue: var(--math); }
.s-focus { --wash: var(--focus-softer); --tile: var(--focus-soft); --hue: var(--focus); }

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 36px; }
.feature h3 { font-size: 19px; margin-top: 14px; }
.feature p { color: var(--text-secondary); margin-top: 8px; font-size: 15px; }

.promise { background: var(--primary); color: #fff; border-radius: var(--radius-xl); padding: 44px; position: relative; overflow: hidden; box-shadow: var(--shadow-raised); }
.promise h2 { font-size: clamp(30px, 4vw, 40px); position: relative; }
.promise ul { list-style: none; padding: 0; margin: 24px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; position: relative; }
.promise li { background: var(--surface); color: var(--text-secondary); border-radius: var(--radius-md); padding: 18px; font-size: 15px; }
.promise li b { display: block; color: var(--text); font-size: 18px; margin-bottom: 4px; }
/* White on coral passes contrast only for large text, so small text sits on white. */
.promise .more { margin-top: 20px; position: relative; }
.promise .more a { display: inline-flex; align-items: center; gap: 8px; background: var(--surface); color: var(--primary-strong); font-weight: 700; font-size: 15px; text-decoration: none; padding: 10px 18px; border-radius: var(--radius-button); }

/* Footer */
.site-footer { padding: 40px 0 56px; color: var(--text-muted); font-size: 14px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 16px 32px; justify-content: space-between; align-items: center; border-top: 1px solid var(--border); padding-top: 28px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 6px 20px; }
.site-footer a { color: var(--text-secondary); text-decoration: none; font-weight: 600; }
.site-footer a:hover { color: var(--primary-strong); }

/* Document pages (privacy, terms, support) */
.doc { padding: 24px 0 40px; }
.doc .wrap { max-width: 760px; }
.doc h1 { font-size: clamp(34px, 5vw, 46px); }
.doc .updated { color: var(--text-muted); margin-top: 10px; font-size: 15px; }
.doc .intro { color: var(--text-secondary); font-size: 18px; margin-top: 16px; }
.doc .card { margin-top: 16px; padding: 26px; }
.doc h2 { font-size: 20px; letter-spacing: -0.01em; }
.doc .card p, .doc .card li { color: var(--text-secondary); font-size: 16px; }
.doc .card p + p, .doc .card p + ul, .doc .card ul + p { margin-top: 10px; }
.doc .card h2 + p, .doc .card h2 + ul { margin-top: 10px; }
.doc ul { margin: 0; padding-left: 1.2em; }
.doc li + li { margin-top: 6px; }
.doc strong { color: var(--text); font-weight: 700; }
.toc { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.toc a { text-decoration: none; }
.summary { background: var(--surface-warm) !important; }
.mail { display: inline-flex; align-items: center; gap: 10px; margin-top: 16px; }
details { border-top: 1px solid var(--border); padding: 14px 0; }
details:first-of-type { border-top: 0; padding-top: 4px; }
summary { cursor: pointer; font-weight: 700; color: var(--text); list-style: none; display: flex; justify-content: space-between; gap: 12px; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; color: var(--primary-strong); font-weight: 800; font-size: 20px; line-height: 1; }
details[open] summary::after { content: "–"; }
details p { margin-top: 8px; }
ol.steps { margin: 10px 0 0; padding-left: 1.3em; color: var(--text-secondary); }
ol.steps li + li { margin-top: 6px; }

@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; gap: 40px; }
  .skills, .features { grid-template-columns: repeat(2, 1fr); }

  .promise ul { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  :root { --gutter: 16px; }
  .site-header .wrap { flex-direction: column; align-items: flex-start; gap: 10px; }
  .nav { margin-left: -12px; }
  .hero { padding-top: 12px; }
  .features { grid-template-columns: 1fr; }
  .skills { gap: 12px; }
  .skill { padding: 16px; }
  .skill h3 { font-size: 16px; margin-top: 12px; }
  .skill p { font-size: 14px; }
  .level-card, .streak-card { transform: none; }
  .promise { padding: 28px 22px; }
  .doc .card { padding: 20px; }
  section { padding: 48px 0; }
}
.doc .card h2 + details { margin-top: 10px; }
.doc .card ol + p { margin-top: 12px; }

/* Hero ring */
.ring .track { stroke: var(--track); }
.ring .fill { color: var(--primary); }
.ring .lbl { fill: var(--text-secondary); font: 600 9px var(--font); }
.ring .num { fill: var(--primary); font: 800 24px var(--font); }
.streak-card .unit { color: var(--text-secondary); font-weight: 600; }

/* Waitlist */
.waitlist { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.waitlist form { display: grid; gap: 14px; }
.field { display: flex; gap: 10px; flex-wrap: wrap; }
.field input[type="email"] { flex: 1 1 220px; min-width: 0; font: 600 16px var(--font); color: var(--text); background: var(--surface); border: 1.5px solid var(--border); border-radius: var(--radius-button); padding: 14px 20px; }
.field input[type="email"]::placeholder { color: var(--text-muted); }
.field input[type="email"]:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 4px var(--primary-soft); }
.field button { border: 0; cursor: pointer; font-family: var(--font); }
.field button[disabled] { opacity: .6; cursor: wait; }
.consent { display: flex; gap: 10px; align-items: flex-start; color: var(--text-secondary); font-size: 14px; }
.consent input { width: 18px; height: 18px; margin-top: 2px; accent-color: var(--primary); flex: none; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-status { min-height: 22px; font-weight: 600; font-size: 15px; }
.form-status.ok { color: var(--success); }
.form-status.err { color: var(--danger); }
.danger-note { color: var(--danger); font-weight: 600; }
@media (max-width: 860px) { .waitlist { grid-template-columns: 1fr; gap: 24px; } }
.doc .ctas { margin-top: 24px; }