/*
 * understandity.com — landing in the app's own style, Ocean lab:
 * light paper, violet action, teal water, JetBrains Mono, radius 0. Light theme only.
 * Tokens mirror apps/web/src/styles.css of the product repo; change them there first.
 */
@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'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2190-2193, U+2212, U+2215; }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 400; font-display: swap; src: url('fonts/jetbrains-mono-cyrillic-400-normal.woff2') format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: 'JetBrains Mono'; font-style: italic; font-weight: 400; font-display: swap; src: url('fonts/jetbrains-mono-latin-400-italic.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2190-2193, U+2212, U+2215; }
@font-face { font-family: 'JetBrains Mono'; font-style: italic; font-weight: 400; font-display: swap; src: url('fonts/jetbrains-mono-cyrillic-400-italic.woff2') format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 500; font-display: swap; src: url('fonts/jetbrains-mono-latin-500-normal.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2190-2193, U+2212, U+2215; }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 500; font-display: swap; src: url('fonts/jetbrains-mono-cyrillic-500-normal.woff2') format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 700; font-display: swap; src: url('fonts/jetbrains-mono-latin-700-normal.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2190-2193, U+2212, U+2215; }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 700; font-display: swap; src: url('fonts/jetbrains-mono-cyrillic-700-normal.woff2') format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 800; font-display: swap; src: url('fonts/jetbrains-mono-latin-800-normal.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2190-2193, U+2212, U+2215; }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 800; font-display: swap; src: url('fonts/jetbrains-mono-cyrillic-800-normal.woff2') format('woff2'); unicode-range: U+0301, U+0400-045F, U+0490-0491, U+04B0-04B1, U+2116; }

:root {
  --bg: #f1f0f5;
  --bg-panel: #fbfafe;
  --bg-elev: #ffffff;
  --fg: #241e31;
  --fg-dim: #5f586e;
  --fg-faint: #7a7488;
  --ink: #181226;
  --accent: #6d55c8;
  --accent-ink: #5640ad;
  --accent-soft: #ede8fa;
  --sea: #0e7c86;
  --sea-soft: #dcedea;
  --sea-deep: #085762;
  --lilac: #e5dff5;
  --sand: #f1e5d3;
  --amber: #c2571a;
  --ok: #0e7a55;
  --border: rgba(30, 24, 46, 0.2);
  --border-bright: rgba(30, 24, 46, 0.4);
  --font: 'JetBrains Mono', ui-monospace, Menlo, monospace;
  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px; --s-5: 24px; --s-6: 32px; --s-7: 48px; --s-8: 64px; --s-9: 96px;
  --measure: 1200px;
  color-scheme: light;
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
* { box-sizing: border-box; border-radius: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }
body { margin: 0; }
a { color: var(--accent); }
h1, h2, h3 { color: var(--ink); font-weight: 800; letter-spacing: -0.015em; margin: 0; }
p { margin: 0; }
img { display: block; max-width: 100%; height: auto; }
code { font-family: var(--font); font-size: 0.92em; background: var(--accent-soft); color: var(--accent-ink); padding: 1px 5px; overflow-wrap: anywhere; }

.wrap { max-width: var(--measure); margin: 0 auto; padding: 0 var(--s-5); }
.label { display: inline-flex; align-items: center; gap: 10px; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.28em; color: var(--accent); }
.label::before { content: ''; width: 8px; height: 8px; background: currentColor; flex: none; }
.label--sea { color: var(--sea); }
.dim { color: var(--fg-dim); }

/* ---------- top bar ---------- */
.bar { position: sticky; top: 0; z-index: 10; background: rgba(241, 240, 245, 0.92); backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px); border-bottom: 1px solid var(--border); }
.bar__in { max-width: var(--measure); margin: 0 auto; padding: 14px var(--s-5); display: flex; gap: var(--s-5); align-items: center; }
.brand { display: flex; align-items: center; flex: none; }
.brand img { height: 26px; width: auto; }
.nav { display: flex; gap: var(--s-1); margin-left: var(--s-3); }
.nav a { font-size: 11px; font-weight: 700; letter-spacing: 0.2em; text-transform: uppercase; color: var(--fg-dim); text-decoration: none; padding: 6px 10px; border: 1px solid transparent; }
.nav a:hover { color: var(--ink); border-color: var(--border); }
.bar__sp { flex: 1; }
.lang { display: flex; border: 1px solid var(--border-bright); }
.lang a, .lang span { font-size: 11px; font-weight: 700; letter-spacing: 0.18em; padding: 5px 9px; text-decoration: none; color: var(--fg-dim); }
.lang span { background: var(--ink); color: var(--bg-elev); }
.lang a:hover { color: var(--accent); }
@media (max-width: 900px) { .nav { display: none; } }

/* ---------- buttons ---------- */
.btn { display: inline-flex; align-items: center; gap: 10px; font: 700 14px/1 var(--font); letter-spacing: 0.02em; padding: 17px 26px; text-decoration: none; border: 1px solid var(--accent); background: var(--accent); color: #fff; }
.btn:hover { background: var(--accent-ink); border-color: var(--accent-ink); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--border-bright); }
.btn--ghost:hover { background: var(--bg-elev); color: var(--accent); border-color: var(--accent); }
.btns { display: flex; flex-wrap: wrap; gap: var(--s-3); }

/* ---------- hero ---------- */
.hero { padding: var(--s-8) 0 var(--s-8); }
.hero__grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: var(--s-7); align-items: center; }
.award { display: inline-flex; align-items: stretch; border: 1px solid var(--ink); background: var(--bg-elev); margin: var(--s-5) 0 var(--s-5); max-width: 100%; }
.award__place { display: flex; align-items: center; gap: 8px; background: var(--ink); color: #fff; font-weight: 800; font-size: 13px; letter-spacing: 0.06em; padding: 9px 12px; white-space: nowrap; }
.award__place::before { content: ''; width: 9px; height: 9px; background: var(--sand); }
.award__text { font-size: 13px; font-weight: 700; color: var(--ink); padding: 9px 12px; }
.award__text .nw { white-space: nowrap; }
.hero h1 { font-size: clamp(40px, 6.2vw, 76px); line-height: 1.02; letter-spacing: -0.03em; }
.hero__lead { font-size: 18px; color: var(--fg-dim); margin: var(--s-5) 0 var(--s-6); max-width: 34ch; }
.hero__lead strong { color: var(--ink); font-weight: 700; }
.quote { border-left: 3px solid var(--accent); padding: 4px 0 4px var(--s-4); margin-top: var(--s-6); font-size: 14px; }
.quote em { color: var(--fg-dim); }
.quote b { display: block; color: var(--ink); }
.frame { border: 1px solid var(--border-bright); background: var(--bg-elev); box-shadow: 10px 10px 0 var(--lilac); }
.frame__top { display: flex; gap: 6px; align-items: center; padding: 8px 10px; border-bottom: 1px solid var(--border); font-size: 11px; color: var(--fg-faint); letter-spacing: 0.08em; }
.frame__top i { width: 8px; height: 8px; background: var(--border); display: block; }
.frame__top span { margin-left: 8px; }
.frame__top .ok { margin-left: auto; color: var(--ok); font-weight: 700; letter-spacing: 0.18em; }
@media (max-width: 960px) { .hero__grid { grid-template-columns: minmax(0, 1fr); } .hero { padding-top: var(--s-6); } }

/* ---------- sections ---------- */
.sec { padding: var(--s-9) 0; border-top: 1px solid var(--border); }
.sec__head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--s-6); align-items: end; margin-bottom: var(--s-7); }
.sec__head h2 { font-size: clamp(28px, 3.6vw, 42px); line-height: 1.1; margin-top: var(--s-3); }
.sec__head p { color: var(--fg-dim); font-size: 15px; }
@media (max-width: 860px) { .sec { padding: var(--s-8) 0; } .sec__head { grid-template-columns: minmax(0, 1fr); gap: var(--s-4); margin-bottom: var(--s-6); } }

/* lesson steps */
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border: 1px solid var(--border-bright); background: var(--bg-panel); counter-reset: step; }
.step { padding: var(--s-5); border-right: 1px solid var(--border); position: relative; }
.step:last-child { border-right: 0; }
.step__n { font-size: 12px; font-weight: 700; letter-spacing: 0.2em; color: var(--accent); }
.step h3 { font-size: 18px; margin: var(--s-3) 0 var(--s-2); }
.step p { font-size: 14px; color: var(--fg-dim); }
.step__mic { display: inline-block; margin-top: var(--s-3); font-size: 11px; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; color: var(--sea); border: 1px solid currentColor; padding: 2px 7px; }
.tutor { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: var(--s-5); align-items: start; margin-top: var(--s-5); padding: var(--s-5); background: var(--accent-soft); border: 1px solid rgba(109, 85, 200, 0.35); }
.tutor__why { font-size: 34px; font-weight: 800; color: var(--accent); line-height: 1; }
.tutor p { font-size: 15px; color: var(--ink); }
@media (max-width: 960px) { .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); } .step:nth-child(2) { border-right: 0; } .step:nth-child(-n+2) { border-bottom: 1px solid var(--border); } }
@media (max-width: 560px) { .steps { grid-template-columns: minmax(0, 1fr); } .step { border-right: 0; border-bottom: 1px solid var(--border); } .step:last-child { border-bottom: 0; } .tutor { grid-template-columns: minmax(0, 1fr); gap: var(--s-3); } }

.worlds { margin-top: var(--s-8); }
.worlds h3 { font-size: 20px; margin-bottom: var(--s-2); }
.worlds > p { color: var(--fg-dim); font-size: 14px; margin-bottom: var(--s-5); max-width: 70ch; }
.worlds__row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--s-3); }
.world { margin: 0; border: 1px solid var(--border-bright); background: var(--bg-elev); }
.world img { aspect-ratio: 1376 / 768; object-fit: cover; width: 100%; }
.world figcaption { font-size: 11px; font-weight: 700; letter-spacing: 0.22em; text-transform: uppercase; padding: 8px 10px; color: var(--ink); }
@media (max-width: 760px) { .worlds__row { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* private */
.sec--sea { background: var(--sea-soft); border-top-color: rgba(14, 124, 134, 0.35); }
.sec--sea .sec__head h2 { color: var(--sea-deep); }
.cards3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-4); }
.card { background: var(--bg-elev); border: 1px solid rgba(8, 87, 98, 0.35); padding: var(--s-5); }
.card h3 { font-size: 18px; margin: var(--s-3) 0 var(--s-3); }
.card p { font-size: 14px; color: var(--fg-dim); }
.card__k { font-size: 11px; font-weight: 700; letter-spacing: 0.22em; color: var(--sea); }
.models { list-style: none; padding: 0; margin: var(--s-4) 0 0; border-top: 1px solid var(--border); }
.models li { display: flex; justify-content: space-between; gap: var(--s-3); font-size: 13px; padding: 7px 0; border-bottom: 1px solid var(--border); }
.models b { color: var(--ink); }
.models span { color: var(--fg-dim); text-align: right; }
.note { margin-top: var(--s-5); font-size: 13px; color: var(--sea-deep); }
@media (max-width: 860px) { .cards3 { grid-template-columns: minmax(0, 1fr); } }

/* make your own course */
.split { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: var(--s-7); align-items: center; }
.split h2 { font-size: clamp(28px, 3.6vw, 42px); line-height: 1.1; margin: var(--s-3) 0 var(--s-5); }
.split p { color: var(--fg-dim); margin-bottom: var(--s-4); }
.flag { display: inline-block; font-size: 12px; color: var(--amber); border: 1px solid currentColor; padding: 4px 9px; margin-top: var(--s-2); }
@media (max-width: 960px) { .split { grid-template-columns: minmax(0, 1fr); } }

/* courses */
.courses { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-4); margin-top: var(--s-7); }
.course { background: var(--bg-elev); border: 1px solid var(--border-bright); }
.course img { aspect-ratio: 1376 / 768; object-fit: cover; width: 100%; border-bottom: 1px solid var(--border); }
.course__b { padding: var(--s-4) var(--s-5) var(--s-5); }
.course__tag { font-size: 11px; font-weight: 700; letter-spacing: 0.22em; text-transform: uppercase; color: var(--fg-dim); }
.course h3 { font-size: 17px; margin-top: var(--s-2); }
@media (max-width: 860px) { .courses { grid-template-columns: minmax(0, 1fr); } }

/* install */
.install { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr); gap: var(--s-6); align-items: start; }
.code { background: var(--bg-elev); border: 1px solid var(--border-bright); border-left: 3px solid var(--accent); }
.code__top { display: flex; justify-content: space-between; align-items: center; padding: 8px 14px; border-bottom: 1px solid var(--border); font-size: 11px; font-weight: 700; letter-spacing: 0.2em; text-transform: uppercase; color: var(--fg-faint); }
.code__copy { font: 700 11px/1 var(--font); letter-spacing: 0.18em; text-transform: uppercase; background: none; border: 1px solid var(--border-bright); color: var(--fg-dim); padding: 5px 8px; cursor: pointer; }
.code__copy:hover { color: var(--accent); border-color: var(--accent); }
.code pre { margin: 0; padding: var(--s-5); overflow-x: auto; font: 500 14px/1.9 var(--font); color: var(--ink); }
.code pre .c { color: var(--fg-faint); }
.code pre .p { color: var(--accent); user-select: none; }
.after { margin-top: var(--s-4); font-size: 14px; color: var(--fg-dim); }
.reqs { border: 1px solid var(--border-bright); background: var(--bg-panel); }
.reqs h3 { font-size: 11px; font-weight: 700; letter-spacing: 0.24em; text-transform: uppercase; color: var(--fg-dim); padding: 12px var(--s-4); border-bottom: 1px solid var(--border); }
.reqs ul { list-style: none; margin: 0; padding: 0; }
.reqs li { display: flex; justify-content: space-between; gap: var(--s-3); padding: 11px var(--s-4); border-bottom: 1px solid var(--border); font-size: 14px; }
.reqs li b { color: var(--ink); }
.reqs li span { color: var(--fg-dim); text-align: right; }
.reqs p { padding: var(--s-4); font-size: 13px; color: var(--fg-dim); }
@media (max-width: 960px) { .install { grid-template-columns: minmax(0, 1fr); } }

/* open source */
.oss { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: var(--s-7); }
.oss h2 { font-size: clamp(28px, 3.6vw, 42px); line-height: 1.1; margin: var(--s-3) 0 var(--s-5); }
.oss p { color: var(--fg-dim); margin-bottom: var(--s-5); }
.repo { display: flex; flex-wrap: wrap; overflow-wrap: anywhere; align-items: center; gap: var(--s-3); border: 1px solid var(--ink); background: var(--bg-elev); padding: var(--s-4) var(--s-5); text-decoration: none; color: var(--ink); font-weight: 700; margin-bottom: var(--s-4); }
.repo:hover { color: var(--accent); border-color: var(--accent); }
.repo small { margin-left: auto; font-size: 11px; letter-spacing: 0.2em; color: var(--fg-dim); font-weight: 700; }
.limits { border: 1px solid var(--border-bright); background: var(--bg-panel); padding: var(--s-5); }
.limits h3 { font-size: 16px; margin-bottom: var(--s-3); }
.limits ul { margin: 0; padding-left: 18px; color: var(--fg-dim); font-size: 14px; }
.limits li + li { margin-top: var(--s-2); }
@media (max-width: 960px) { .oss { grid-template-columns: minmax(0, 1fr); gap: var(--s-6); } }

/* footer */
.foot { border-top: 1px solid var(--border); padding: var(--s-6) 0 var(--s-7); font-size: 13px; color: var(--fg-dim); }
.foot__in { display: flex; flex-wrap: wrap; gap: var(--s-4); justify-content: space-between; align-items: center; }
.foot img { height: 20px; width: auto; }
.foot a { color: var(--fg-dim); }
.foot a:hover { color: var(--accent); }
@media (max-width: 560px) { .repo { font-size: 13px; padding: var(--s-4); } }