@font-face { font-family: "Instrument Serif"; font-style: normal; font-weight: 400; font-display: swap; src: url("/fonts/instrument-serif-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "Instrument Serif"; font-style: italic; font-weight: 400; font-display: swap; src: url("/fonts/instrument-serif-latin-400-italic.woff2") format("woff2"); }
@font-face { font-family: "Hanken Grotesk"; font-style: normal; font-weight: 400; font-display: swap; src: url("/fonts/hanken-grotesk-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "Hanken Grotesk"; font-style: normal; font-weight: 600; font-display: swap; src: url("/fonts/hanken-grotesk-latin-600-normal.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("/fonts/jetbrains-mono-latin-400-normal.woff2") format("woff2"); }

:root {
  --paper: #F7F4EE;
  --card: #FFFFFF;
  --ink: #17141F;
  --muted: #5F5A6B;
  --line: rgba(23, 20, 31, .09);
  --grid: rgba(89, 58, 255, .055);
  --brand: #593AFF;
  --brand-soft: #ECE7FF;
  --bezel: #17141F;
  --serif: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --sans: "Hanken Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0E0C14;
    --card: #17151F;
    --ink: #F3F0FA;
    --muted: #A6A0B5;
    --line: rgba(255, 255, 255, .09);
    --grid: rgba(154, 133, 255, .07);
    --brand: #9A85FF;
    --brand-soft: rgba(154, 133, 255, .14);
    --bezel: #2A2735;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--ink);
  font: 17px/1.6 var(--sans);
}
a { color: var(--brand); text-underline-offset: 3px; }
img { display: block; max-width: 100%; height: auto; }

.wrap { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 24px; }

/* Top bar and footer, shared by every page */
.bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-top: 24px; padding-bottom: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 600; text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.bar nav { display: flex; gap: 24px; font-size: 15px; }
.bar nav a, footer a { color: var(--muted); text-decoration: none; }
.bar nav a:hover, footer a:hover { color: var(--ink); }
footer { margin-top: auto; border-top: 1px solid var(--line); }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; padding-top: 28px; padding-bottom: 40px; color: var(--muted); font-size: 14px; }
footer nav { display: flex; gap: 24px; }

/* Home: hero */
.hero { display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 56px; padding-top: 48px; padding-bottom: 112px; }
.eyebrow { display: inline-block; margin: 0 0 20px; padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; background: var(--card); color: var(--muted); font: 13px/1 var(--mono); letter-spacing: .02em; }
h1 { margin: 0; font: 400 clamp(52px, 7vw, 92px)/.98 var(--serif); letter-spacing: -.02em; }
h1 em { color: var(--brand); }
.lead { max-width: 31em; margin: 24px 0 0; color: var(--muted); font-size: 20px; line-height: 1.55; }
.facts { display: flex; flex-wrap: wrap; gap: 12px 36px; margin: 36px 0 0; padding: 24px 0 0; border-top: 1px solid var(--line); list-style: none; color: var(--muted); font-size: 15px; }
.facts strong { display: block; color: var(--ink); font: 400 40px/1 var(--serif); }

.art { position: relative; justify-self: center; width: min(100%, 440px); }
.phone { margin: 0; padding: 10px; border-radius: 48px; background: var(--bezel); box-shadow: 0 40px 80px -40px rgba(23, 20, 31, .45), 0 0 0 1px var(--line); }
.phone img { width: 100%; border-radius: 38px; }
.art .phone { width: 290px; margin-left: auto; transform: rotate(2deg); }
.quiz {
  position: absolute; left: -56px; bottom: 40px; width: 300px;
  padding: 18px; border-radius: 20px; background: var(--card);
  box-shadow: 0 30px 60px -28px rgba(23, 20, 31, .45), 0 0 0 1px var(--line);
  font-size: 14px; line-height: 1.4; transform: rotate(-2deg);
}
.quiz-label { color: #2973FF; font: 11px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.quiz-q { margin: 10px 0 12px; font: 400 22px/1.15 var(--serif); }
.quiz-a { margin-top: 6px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 12px; color: var(--muted); }
.quiz-a.right { border-color: #6FD08C; background: rgba(111, 208, 140, .14); color: var(--ink); }
.quiz-note { margin-top: 12px; color: var(--muted); font-size: 13px; }
.quiz-note b { color: #2FA35A; }

/* Home: sections */
.block { padding-bottom: 120px; }
.kicker { margin: 0 0 12px; color: var(--brand); font: 13px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.title { max-width: 16em; margin: 0 0 40px; font: 400 clamp(38px, 4.6vw, 56px)/1.05 var(--serif); letter-spacing: -.01em; }
.body { max-width: 30em; margin: 0; color: var(--muted); font-size: 18px; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.step { display: flex; flex-direction: column; padding: 28px 28px 0; overflow: hidden; border: 1px solid var(--line); border-radius: 28px; background: var(--card); }
.num { color: var(--brand); font: 13px/1 var(--mono); }
.step h3 { margin: 14px 0 8px; font: 400 30px/1.1 var(--serif); }
.step p { margin: 0 0 28px; color: var(--muted); }
.step .phone { width: 74%; height: 330px; margin: auto auto 0; overflow: hidden; border-radius: 40px 40px 0 0; padding-bottom: 0; }
.step .phone img { border-radius: 30px 30px 0 0; }

.units { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.unit { --tint: #2973FF; padding: 32px; border: 1px solid var(--line); border-top: 4px solid var(--tint); border-radius: 28px; background: var(--card); }
.u2 { --tint: #593AFF; }
.u3 { --tint: #00997A; }
.u4 { --tint: #FF6633; }
.unit-no { margin: 0; color: var(--tint); font: 13px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.unit h3 { margin: 12px 0 6px; font: 400 34px/1.1 var(--serif); }
.unit-sum { margin: 0 0 20px; color: var(--muted); }
.unit ol { margin: 0; padding: 0; list-style: none; counter-reset: lesson calc(var(--start, 1) - 1); }
.unit ol[start="5"] { --start: 5; }
.unit ol[start="9"] { --start: 9; }
.unit ol[start="13"] { --start: 13; }
.unit li { position: relative; padding: 12px 0 12px 44px; border-top: 1px solid var(--line); color: var(--muted); font-size: 15px; counter-increment: lesson; }
.unit li::before { content: counter(lesson, decimal-leading-zero); position: absolute; left: 0; top: 14px; color: var(--tint); font: 13px/1.4 var(--mono); }
.unit li span { display: block; color: var(--ink); font-weight: 600; font-size: 16px; }

.feature { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 64px; }
.feature > div { min-width: 0; }
.feature .phone { width: 300px; justify-self: center; }
.feature.flip > div { order: 2; }
.feature .diff { margin-top: 32px; }
.diff {
  width: 372px; max-width: 100%; padding: 16px 18px 18px; border-radius: 18px;
  background: #16131F; color: #E9E6F2;
  box-shadow: 0 30px 60px -30px rgba(23, 20, 31, .6), 0 0 0 1px rgba(255, 255, 255, .1);
  font: 12.5px/1.7 var(--mono);
}
.diff-file { margin-bottom: 8px; color: #8D87A0; }
.diff code { display: block; padding: 1px 8px; border-radius: 6px; font: inherit; white-space: pre; overflow: hidden; text-overflow: clip; }
.diff .del { background: rgba(255, 99, 99, .14); color: #FFB4B4; }
.diff .add { margin-top: 3px; background: rgba(110, 231, 160, .14); color: #A9F1C6; }
.diff .run { display: inline-block; margin-top: 14px; padding: 7px 14px; border-radius: 999px; background: #593AFF; color: #FFFFFF; font: 600 13px/1 var(--sans); }

.practice { justify-self: center; width: 100%; max-width: 440px; padding: 32px; border: 1px solid var(--line); border-radius: 28px; background: var(--card); box-shadow: 0 40px 80px -48px rgba(23, 20, 31, .35); }
.practice-label { margin: 0; color: #2973FF; font: 12px/1.5 var(--mono); letter-spacing: .06em; text-transform: uppercase; }
.practice-text { margin: 14px 0 24px; font: 400 26px/1.25 var(--serif); }
.practice-steps { margin: 0; padding: 0; list-style: none; counter-reset: step; }
.practice-steps li { position: relative; padding: 12px 0 12px 40px; border-top: 1px solid var(--line); color: var(--muted); counter-increment: step; }
.practice-steps li::before { content: counter(step); position: absolute; left: 0; top: 11px; width: 26px; height: 26px; border-radius: 50%; background: var(--brand-soft); color: var(--brand); font: 13px/26px var(--mono); text-align: center; }

.faq details { max-width: 820px; border-top: 1px solid var(--line); }
.faq details:last-of-type { border-bottom: 1px solid var(--line); }
.faq summary { display: flex; justify-content: space-between; gap: 16px; padding: 20px 0; cursor: pointer; font: 400 26px/1.2 var(--serif); list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--brand); font: 22px/1.2 var(--mono); }
.faq details[open] summary::after { content: "−"; }
.faq details p { max-width: 36em; margin: -4px 0 22px; color: var(--muted); }

/* Text pages: privacy and support */
.doc { width: 100%; max-width: 760px; margin: 0 auto; padding: 32px 24px 96px; }
.doc h1 { font-size: clamp(44px, 6vw, 64px); }
.doc .lead { margin-top: 12px; font: 13px/1.4 var(--mono); }
.doc section { margin-top: 40px; padding-top: 28px; border-top: 1px solid var(--line); }
.doc section:first-of-type { margin-top: 48px; }
.doc h2 { margin: 0 0 10px; font: 400 30px/1.15 var(--serif); }
.doc p { margin: 0; color: var(--muted); }
.doc p + p { margin-top: 12px; }
.contact { margin-top: 48px; padding: 32px; border: 1px solid var(--line); border-radius: 28px; background: var(--card); }
.button { display: inline-block; padding: 14px 22px; border-radius: 999px; background: var(--brand); color: #FFFFFF; font-weight: 600; text-decoration: none; }
.contact p { margin-top: 20px; font-size: 15px; }
.contact .note { margin: 0 0 24px; font-size: 17px; }

/* Load-in, once */
@media (prefers-reduced-motion: no-preference) {
  .rise { animation: rise .7s cubic-bezier(.2, .7, .2, 1) both; }
  .rise:nth-child(2) { animation-delay: .08s; }
  .rise:nth-child(3) { animation-delay: .16s; }
  .rise:nth-child(4) { animation-delay: .24s; }
  @keyframes rise { from { opacity: 0; transform: translateY(14px); } }
}

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 48px; padding-top: 24px; padding-bottom: 72px; }
  .art { width: min(100%, 360px); }
  .art .phone { width: 250px; margin-right: auto; transform: none; }
  .quiz { position: relative; left: auto; bottom: auto; width: 100%; max-width: 340px; margin: -64px auto 0; transform: none; }
  .block { padding-bottom: 88px; }
  .steps, .units, .feature { grid-template-columns: 1fr; }
  .step .phone { width: 64%; max-width: 280px; }
  .feature { gap: 40px; }
  .feature.flip > div { order: 0; }
  .feature .phone { width: 250px; }
  .diff { font-size: 11.5px; }
}
@media (max-width: 480px) {
  .wrap { padding-left: 16px; padding-right: 16px; }
  .bar nav a[href="#course"] { display: none; }
  .doc { padding: 24px 16px 72px; }
  .bar nav { gap: 16px; }
  .lead { font-size: 18px; }
  .unit { padding: 24px; }
  .facts { gap: 12px 24px; }
}
@media (prefers-color-scheme: dark) {
  .u2 { --tint: #9A85FF; }
}