/* Brewlearn — "late-night terminal in a coffee shop".
   Deep ink surfaces, crema accents, violet/mint for meaning. */
:root {
  /* Coffee house after dark — mirrors the app's Theme.swift */
  --ink: #1b120c;          /* espresso */
  --surface: #2a1c14;      /* dark roast */
  --surface-2: #3a281c;    /* medium roast */
  --stroke: rgba(247, 236, 221, 0.09);
  --text: #f7ecdd;         /* steamed milk */
  --text-2: rgba(247, 236, 221, 0.74);
  --text-3: rgba(247, 236, 221, 0.52);
  --crema: #edb46a;
  --roast: #c5793a;        /* caramel */
  --mint: #9bcb7a;         /* matcha = correct */
  --coral: #e46a5e;        /* coffee cherry = mistake */
  --violet: #bba6e8;       /* lavender latte = understanding */
  --sky: #86b9cf;          /* cold brew = info */
  --grad-crema: linear-gradient(135deg, var(--crema), var(--roast));

  --font-display: "Fraunces", "New York", Georgia, serif;
  --font-body: "DM Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-code: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;

  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-hero: clamp(2.6rem, 1.4rem + 5vw, 5.2rem);
  --text-h2: clamp(1.9rem, 1.3rem + 2.4vw, 3.1rem);
  --space-section: clamp(4.5rem, 3rem + 6vw, 9rem);
  --radius: 22px;
  --radius-lg: 32px;
  --max: 1180px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font: 400 var(--text-base)/1.65 var(--font-body);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before { /* aurora */
  content: "";
  position: fixed; inset: -20vmax;
  z-index: -1;
  background:
    radial-gradient(40vmax 30vmax at 12% 0%, rgba(197, 121, 58, 0.22), transparent 70%),
    radial-gradient(35vmax 30vmax at 88% 18%, rgba(187, 166, 232, 0.08), transparent 70%),
    radial-gradient(40vmax 35vmax at 70% 95%, rgba(237, 180, 106, 0.10), transparent 70%);
  pointer-events: none;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--crema); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: #f6cf98; }
:focus-visible { outline: 3px solid var(--violet); outline-offset: 3px; border-radius: 8px; }
h1, h2, h3 { font-family: var(--font-display); line-height: 1.06; letter-spacing: -0.015em; margin: 0 0 0.5em; font-optical-sizing: auto; }
h1 { font-size: var(--text-hero); font-weight: 700; }
h2 { font-size: var(--text-h2); font-weight: 700; }
h3 { font-size: 1.4rem; font-weight: 600; }
p { margin: 0 0 1em; }
code { font-family: var(--font-code); font-size: 0.9em; color: var(--sky); }
strong { color: var(--crema); font-weight: 700; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 16px; z-index: 99; background: var(--surface); padding: 10px 16px; }

.wrap { width: min(var(--max), 100% - 32px); margin-inline: auto; }
.narrow { width: min(760px, 100% - 32px); margin-inline: auto; }
.eyebrow { font: 800 0.8rem/1 var(--font-body); letter-spacing: 0.16em; text-transform: uppercase; color: var(--text-3); }
.lede { font-size: clamp(1.1rem, 1rem + 0.5vw, 1.35rem); color: var(--text-2); max-width: 46ch; }
.grad { background: var(--grad-crema); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 20; backdrop-filter: saturate(1.4) blur(16px); background: rgba(27, 18, 12, 0.78); border-bottom: 1px solid var(--stroke); }
.site-header .wrap { display: flex; align-items: center; gap: 24px; min-height: 68px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font: 800 1.2rem var(--font-display); }
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.nav { display: flex; gap: 22px; margin-left: auto; }
.nav a { color: var(--text-2); text-decoration: none; font-weight: 500; font-size: 0.97rem; }
.nav a:hover { color: var(--text); }
@media (max-width: 760px) { .nav { display: none; } .site-header .btn { margin-left: auto; } }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 52px; padding: 0 26px; border-radius: 16px; font: 700 1rem var(--font-body); text-decoration: none; border: 0; cursor: pointer; transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s; }
.btn-primary { background: var(--crema); color: var(--ink); box-shadow: 0 4px 0 #9a5c2a; }
.btn-primary:hover { color: var(--ink); transform: translateY(-2px); box-shadow: 0 6px 0 #9a5c2a, 0 18px 40px rgba(237, 180, 106, 0.28); }
.btn-primary:active { transform: translateY(3px); box-shadow: 0 1px 0 #9a5c2a; }
.btn-ghost { background: var(--surface-2); color: var(--text); box-shadow: inset 0 0 0 1px var(--stroke); }
.btn-ghost:hover { color: var(--text); background: #4a3426; }
.btn-sm { min-height: 42px; padding: 0 18px; border-radius: 12px; font-size: 0.95rem; }
.store-badge { display: inline-flex; align-items: center; gap: 12px; min-height: 58px; padding: 0 22px; border-radius: 16px; background: #000; color: #fff; text-decoration: none; box-shadow: inset 0 0 0 1px rgba(255,255,255,0.25); transition: transform 0.2s var(--ease); }
.store-badge:hover { color: #fff; transform: translateY(-2px); }
.store-badge svg { width: 26px; height: 26px; }
.store-badge small { display: block; font-size: 0.72rem; opacity: 0.8; line-height: 1.1; }
.store-badge b { display: block; font: 700 1.15rem/1.15 var(--font-body); }
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.note { color: var(--text-3); font-size: 0.9rem; }

/* Hero */
.hero { padding: clamp(3rem, 2rem + 5vw, 6rem) 0 var(--space-section); }
.hero .wrap { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(2rem, 4vw, 4rem); align-items: center; }
.hero h1 { margin: 0.35em 0 0.35em; }
.hero .lede { margin-bottom: 1.8rem; }
@media (max-width: 920px) { .hero .wrap { grid-template-columns: 1fr; } .phone { width: min(250px, 42vw); } .phones { min-height: 0; padding: 20px 0 40px; } }
.stats { display: flex; flex-wrap: wrap; gap: 12px 30px; margin-top: 2.2rem; padding: 0; list-style: none; }
.stats li { color: var(--text-2); font-size: 0.95rem; }
.stats b { display: block; font: 800 1.7rem/1.1 var(--font-display); color: var(--text); }

.phones { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 0; align-items: center; justify-items: center; min-height: 520px; }
.phone { width: min(280px, 21vw); border-radius: 44px; padding: 9px; background: linear-gradient(160deg, #5a4030, #140d09); box-shadow: 0 40px 90px rgba(0,0,0,0.55), 0 0 0 1px rgba(255,255,255,0.08); }
.phone img { border-radius: 36px; width: 100%; aspect-ratio: 660 / 1434; object-fit: cover; }
.phones .phone:first-child { transform: rotate(-5deg) translate(18px, 26px); z-index: 1; }
.phones .phone:last-child { transform: rotate(4deg) translate(-18px, -26px); z-index: 2; }
.phones::after { content: ""; position: absolute; inset: 10% 5%; z-index: 0; background: radial-gradient(closest-side, rgba(237,180,106,0.32), transparent); filter: blur(20px); }

/* Sections */
section { padding: var(--space-section) 0 0; }
.section-head { max-width: 760px; margin-bottom: clamp(2rem, 4vw, 3.5rem); }
.section-head p { color: var(--text-2); font-size: 1.15rem; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 920px) { .steps { grid-template-columns: 1fr; } }
.step { background: var(--surface); border: 1px solid var(--stroke); border-radius: var(--radius-lg); padding: 28px 28px 0; overflow: hidden; display: flex; flex-direction: column; transition: transform 0.3s var(--ease), border-color 0.3s; }
.step:hover { transform: translateY(-4px); border-color: rgba(237,180,106,0.35); }
.step .num { font: 800 0.85rem var(--font-body); color: var(--ink); background: var(--crema); width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; margin-bottom: 18px; }
.step p { color: var(--text-2); }
.step .shot { margin-top: auto; padding-top: 12px; }
.step .shot img { border-radius: 28px 28px 0 0; width: 78%; margin: 0 auto; box-shadow: 0 -10px 40px rgba(0,0,0,0.4); }

.bento { display: grid; grid-template-columns: repeat(6, 1fr); grid-auto-flow: dense; gap: 20px; }
.tile { grid-column: span 2; background: var(--surface); border: 1px solid var(--stroke); border-radius: var(--radius); padding: 26px; position: relative; overflow: hidden; }
.tile.wide { grid-column: span 4; }
.tile.full { grid-column: span 6; }
.tile .icon { font-size: 1.9rem; margin-bottom: 10px; display: block; }
.tile p { color: var(--text-2); margin: 0; }
.tile h3 { margin-bottom: 0.35em; }
.tile.accent { background: linear-gradient(140deg, rgba(187,166,232,0.22), var(--surface) 60%); }
.tile.mac img { margin-top: 20px; border-radius: 14px; box-shadow: 0 20px 50px rgba(0,0,0,0.5); }
@media (max-width: 920px) { .bento { grid-template-columns: 1fr 1fr; } .tile, .tile.wide, .tile.full { grid-column: span 2; } }

.tiers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 920px) { .tiers { grid-template-columns: 1fr; } }
.tier { background: var(--surface); border: 1px solid var(--stroke); border-radius: var(--radius); padding: 26px; }
.tier h3 { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.tier h3 small { font: 600 0.8rem var(--font-body); color: var(--text-3); }
.tier[data-tier="beginner"] h3 { color: var(--mint); }
.tier[data-tier="intermediate"] h3 { color: var(--sky); }
.tier[data-tier="advanced"] h3 { color: var(--violet); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 0; padding: 0; list-style: none; }
.chips a { display: inline-block; padding: 7px 12px; border-radius: 999px; background: var(--surface-2); color: var(--text); text-decoration: none; font-size: 0.92rem; transition: background 0.2s; }
.chips a:hover { background: #4a3426; color: var(--text); }

.audience { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
@media (max-width: 920px) { .audience { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .audience { grid-template-columns: 1fr; } }
.audience div { background: var(--surface); border: 1px solid var(--stroke); border-radius: var(--radius); padding: 22px; }
.audience p { color: var(--text-2); margin: 0; font-size: 0.97rem; }

.faq details { background: var(--surface); border: 1px solid var(--stroke); border-radius: 18px; padding: 0 22px; margin-bottom: 12px; }
.faq summary { cursor: pointer; padding: 20px 0; font: 700 1.08rem var(--font-body); list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--crema); font-size: 1.4rem; line-height: 1; transition: transform 0.25s var(--ease); }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: var(--text-2); padding-bottom: 18px; margin: 0; }

.cta-band { margin-top: var(--space-section); padding: clamp(2.5rem, 5vw, 4.5rem); border-radius: var(--radius-lg); background: radial-gradient(60% 120% at 0% 0%, rgba(155,203,122,0.18), transparent), linear-gradient(140deg, rgba(187,166,232,0.28), var(--surface)); border: 1px solid rgba(155,203,122,0.3); display: grid; grid-template-columns: auto 1fr; gap: 32px; align-items: center; }
.cta-band img { width: 120px; height: 120px; border-radius: 28px; box-shadow: 0 20px 50px rgba(0,0,0,0.5); }
.cta-band h2 { font-size: clamp(1.8rem, 1.2rem + 2vw, 2.8rem); }
@media (max-width: 680px) { .cta-band { grid-template-columns: 1fr; } }

/* Footer */
.site-footer { margin-top: var(--space-section); border-top: 1px solid var(--stroke); padding: 48px 0 40px; color: var(--text-3); font-size: 0.93rem; }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 32px; }
@media (max-width: 820px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.site-footer h2 { font: 800 0.8rem var(--font-body); letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-2); margin-bottom: 12px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 7px; }
.site-footer a { color: var(--text-3); text-decoration: none; }
.site-footer a:hover { color: var(--text); }
.legal { margin-top: 36px; display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }

/* Course & lesson pages */
.crumbs { font-size: 0.9rem; color: var(--text-3); margin: 28px 0 18px; }
.crumbs ol { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.crumbs li + li::before { content: "›"; margin-right: 6px; color: var(--text-3); }
.crumbs a { color: var(--text-2); text-decoration: none; }
.page-head { padding: 12px 0 8px; }
.page-head .lede { max-width: 60ch; }
.tag { display: inline-block; padding: 6px 12px; border-radius: 999px; font: 800 0.74rem var(--font-body); letter-spacing: 0.12em; text-transform: uppercase; background: rgba(155,203,122,0.14); color: var(--mint); }
.tag.intermediate { background: rgba(134,185,207,0.14); color: var(--sky); }
.tag.advanced { background: rgba(187,166,232,0.16); color: var(--violet); }

.article { padding-bottom: 20px; }
.article h2 { font-size: clamp(1.45rem, 1.2rem + 1vw, 1.9rem); margin-top: 2.2em; }
.article p, .article li { color: rgba(247,236,221,0.88); }
.hook { margin: 28px 0; padding: 26px 28px; border-radius: var(--radius); background: linear-gradient(140deg, rgba(187,166,232,0.22), var(--surface)); border: 1px solid rgba(187,166,232,0.4); font: 600 1.25rem/1.5 var(--font-body); }
.hook .eyebrow { display: block; color: var(--violet); margin-bottom: 10px; }
.callout { margin: 22px 0; padding: 20px 22px; border-radius: 18px; background: var(--surface); border-left: 4px solid var(--crema); }
.callout.trap { border-left-color: var(--coral); }
.callout.real { border-left-color: var(--mint); }
.callout.fact { border-left-color: var(--violet); }
.callout .eyebrow { display: block; margin-bottom: 8px; }
.callout p:last-child { margin-bottom: 0; }

pre { margin: 18px 0; padding: 18px 20px; border-radius: 16px; background: #120b07; border: 1px solid var(--stroke); overflow-x: auto; font: 500 0.95rem/1.6 var(--font-code); }
pre code { color: rgba(247,236,221,0.92); font-size: inherit; }
pre .hl { display: inline-block; width: 100%; background: rgba(237,180,106,0.14); box-shadow: -20px 0 0 rgba(237,180,106,0.14), inset 3px 0 0 var(--crema); }
.k { color: #f08a7d; } .t { color: #8fc4db; } .s { color: #a8d68a; } .n { color: #f2bf73; } .c { color: rgba(247,236,221,0.4); } .a { color: #c4aded; }

.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 18px 0; }
@media (max-width: 640px) { .compare { grid-template-columns: 1fr; } }
.compare > div { border-radius: 18px; padding: 16px 18px; background: var(--surface); }
.compare .bad { border: 1px solid rgba(228,106,94,0.45); }
.compare .good { border: 1px solid rgba(155,203,122,0.45); }
.compare b { display: block; margin-bottom: 4px; }
.compare .bad b { color: var(--coral); } .compare .good b { color: var(--mint); }
.compare pre { margin: 10px 0; }
.compare p { margin: 0; font-size: 0.95rem; color: var(--text-2); }

.quiz { margin: 18px 0; padding: 20px 22px; border-radius: 18px; background: var(--surface); border: 1px solid var(--stroke); }
.quiz ol { margin: 10px 0 0; padding-left: 1.3em; }
.quiz details { margin-top: 14px; }
.quiz summary { cursor: pointer; color: var(--crema); font-weight: 700; }
.quiz details p { margin: 10px 0 0; color: var(--text-2); }

.takeaways { margin: 22px 0; padding: 22px 24px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--stroke); }
.takeaways ol { margin: 0; padding-left: 1.3em; }
.takeaways li { margin: 6px 0; }

.app-cta { margin: 40px 0; padding: 28px; border-radius: var(--radius-lg); background: linear-gradient(140deg, rgba(155,203,122,0.16), var(--surface) 70%); border: 1px solid rgba(155,203,122,0.35); display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; }
.app-cta h2 { margin: 0 0 6px; font-size: 1.5rem; }
.app-cta p { margin: 0; color: var(--text-2); }
.app-cta img { width: 150px; border-radius: 24px; }
@media (max-width: 640px) { .app-cta { grid-template-columns: 1fr; } .app-cta img { display: none; } }

.pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin: 30px 0; }
.pager a { display: block; padding: 18px 20px; border-radius: 18px; background: var(--surface); border: 1px solid var(--stroke); text-decoration: none; color: var(--text); transition: border-color 0.2s; }
.pager a:hover { border-color: rgba(237,180,106,0.45); color: var(--text); }
.pager small { display: block; color: var(--text-3); margin-bottom: 4px; }
.pager .next { text-align: right; grid-column: 2; }
.teaser { color: var(--text-2); font-style: italic; }

.concept-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; counter-reset: c; }
.concept-list a { display: grid; grid-template-columns: 44px 1fr; gap: 14px; align-items: start; padding: 18px 20px; border-radius: 18px; background: var(--surface); border: 1px solid var(--stroke); text-decoration: none; color: var(--text); transition: transform 0.2s var(--ease), border-color 0.2s; }
.concept-list a:hover { transform: translateX(4px); border-color: rgba(237,180,106,0.4); color: var(--text); }
.concept-list a::before { counter-increment: c; content: counter(c); width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; background: var(--surface-2); color: var(--crema); font-weight: 800; }
.concept-list b { display: block; font-size: 1.05rem; }
.concept-list span { color: var(--text-2); font-size: 0.95rem; }

.world-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.world-grid a { display: block; padding: 22px; border-radius: var(--radius); background: var(--surface); border: 1px solid var(--stroke); color: var(--text); text-decoration: none; transition: transform 0.2s var(--ease), border-color 0.2s; }
.world-grid a:hover { transform: translateY(-3px); border-color: rgba(237,180,106,0.4); color: var(--text); }
.world-grid .emoji { font-size: 2rem; display: block; margin-bottom: 8px; }
.world-grid span { color: var(--text-3); font-size: 0.9rem; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}
.quiz li, .quiz li code { white-space: pre-line; }
.quiz ol { display: grid; gap: 4px; }