/* eagerlymath.com: the grown-ups' guide. Its own look, apart from the studio site:
   a white page with soft panels, a deep navy band for the app, Lexend like the app. */
@font-face {
  font-family: "Lexend";
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url("fonts/lexend-latin.woff2") format("woff2");
}
/* Turkish letters (ğ, ş, İ). Lexend has no Cyrillic, so Russian uses the system font. */
@font-face {
  font-family: "Lexend";
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url("fonts/lexend-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

:root {
  --page: #ffffff;
  --panel: #f4f6fa;
  --card: #ffffff;
  --ink: #0f1a2e;
  --muted: #55627a;
  --line: #e3e8f0;
  --blue: #0067e6;
  --blue-soft: #e6effc;
  --amber: #f5a00a;
  --amber-soft: #fff3dc;
  --amber-ink: #9a5d00;
  --pic-grid: #c9d6ea;
  --cube: #fde7b8;
  --navy: #0b1630;
  --navy-2: #14254a;
  --on-navy: #ffffff;
  --on-navy-muted: #b6c3dc;
  --on-navy-accent: #7db2ff;
  --shadow: 0 1px 2px rgba(15, 26, 46, 0.04), 0 8px 24px rgba(15, 26, 46, 0.06);
  --shadow-lift: 0 2px 4px rgba(15, 26, 46, 0.05), 0 16px 36px rgba(15, 26, 46, 0.1);
  --font: "Lexend", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --radius: 24px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --page: #0a101c; --panel: #111a2b; --card: #111a2b; --ink: #edf2fa; --muted: #a3b0c7; --line: #1f2a40;
    --blue: #6aa6ff; --blue-soft: #16264a; --amber-soft: #3a2c10; --amber-ink: #f7c15c; --pic-grid: #3a4c6d; --cube: #5a4214;
    --navy: #0e1b38; --navy-2: #172a52;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3); --shadow-lift: 0 12px 30px rgba(0, 0, 0, 0.45);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --page: #0a101c; --panel: #111a2b; --card: #111a2b; --ink: #edf2fa; --muted: #a3b0c7; --line: #1f2a40;
  --blue: #6aa6ff; --blue-soft: #16264a; --amber-soft: #3a2c10; --amber-ink: #f7c15c; --pic-grid: #3a4c6d; --cube: #5a4214;
  --navy: #0e1b38; --navy-2: #172a52;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3); --shadow-lift: 0 12px 30px rgba(0, 0, 0, 0.45);
  color-scheme: dark;
}

/* Base */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--page); color: var(--ink); font-family: var(--font); font-size: 1.0625rem; font-weight: 350; line-height: 1.6; overflow-x: clip; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); text-underline-offset: 3px; }
a:focus-visible { outline: 3px solid var(--amber); outline-offset: 3px; border-radius: 6px; }
h1, h2, h3 { line-height: 1.15; text-wrap: balance; font-weight: 650; margin: 0; }
h1 { font-size: clamp(2.2rem, 5.6vw, 3.6rem); letter-spacing: -0.035em; font-weight: 700; }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); letter-spacing: -0.025em; }
h3 { font-size: 1.15rem; letter-spacing: -0.01em; }
p { margin: 0; }
.wrap { max-width: 70rem; margin: 0 auto; padding-left: max(20px, env(safe-area-inset-left, 0px)); padding-right: max(20px, env(safe-area-inset-right, 0px)); }
main { padding-block: 0 80px; display: grid; gap: 72px; }
.stack { display: grid; gap: 12px; align-content: start; min-width: 0; }
.muted { color: var(--muted); }
.lead { font-size: 1.22rem; color: var(--muted); font-weight: 300; max-width: 40rem; }
.eyebrow, .label { font-size: 0.78rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.card { background: var(--panel); border-radius: var(--radius); padding: clamp(22px, 4vw, 36px); }
.card h2 { font-size: 1.4rem; }
.links-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.button { display: inline-flex; align-items: center; gap: 8px; padding: 13px 22px; border-radius: 999px; font-weight: 550; text-decoration: none; background: var(--blue); color: #fff; border: 1.5px solid transparent; }
.button:hover { filter: brightness(1.08); }
.button.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.button.ghost:hover { border-color: var(--blue); color: var(--blue); filter: none; }
.arrow::after { content: " →"; }

/* Header */
.top { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--page) 86%, transparent); backdrop-filter: saturate(1.6) blur(14px); -webkit-backdrop-filter: saturate(1.6) blur(14px); border-bottom: 1px solid var(--line); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 10px 20px; flex-wrap: wrap; padding-block: 12px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.brand img { width: 36px; height: 36px; border-radius: 23%; box-shadow: 0 2px 6px rgba(0, 60, 140, 0.2); }
.brand b { font-weight: 700; font-size: 1.28rem; letter-spacing: -0.03em; }
.brand b span { color: var(--blue); }
.nav { display: flex; align-items: center; gap: 8px 22px; flex-wrap: wrap; font-size: 0.96rem; }
.nav a { color: var(--muted); text-decoration: none; font-weight: 450; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--ink); }
.nav .get { display: inline-flex; align-items: center; gap: 8px; background: var(--ink); color: var(--page); padding: 6px 14px 6px 6px; border-radius: 999px; font-weight: 550; }
.nav .get:hover { color: var(--page); filter: brightness(1.15); }
.nav .get img { width: 26px; height: 26px; border-radius: 23%; }
.lang { display: flex; gap: 2px; font-size: 0.76rem; font-weight: 500; border: 1px solid var(--line); border-radius: 999px; padding: 3px; }
.lang a, .lang span { padding: 3px 8px; border-radius: 999px; color: var(--muted); text-decoration: none; }
.lang span.on { background: var(--blue); color: #fff; }
.lang a:hover { color: var(--blue); }

/* Full-width navy bands */
.band { margin-inline: calc(50% - 50vw); padding-inline: calc(50vw - 50%); background: radial-gradient(120% 90% at 85% 10%, var(--navy-2) 0%, var(--navy) 60%); color: var(--on-navy); }
.band .lead, .band .muted { color: var(--on-navy-muted); }
.band .eyebrow { color: var(--on-navy-accent); }

/* Home hero */
.home-hero { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: 40px; align-items: center; padding-block: clamp(48px, 8vw, 88px) 0; overflow: hidden; }
.home-hero .copy { display: grid; gap: 22px; align-content: center; padding-bottom: clamp(32px, 6vw, 72px); }
.home-hero h1 em { font-style: normal; color: var(--on-navy-accent); }
.home-hero .button.ghost { color: var(--on-navy); border-color: rgba(255, 255, 255, 0.25); }
.home-hero .button.ghost:hover { border-color: #fff; color: #fff; }
.trust { display: flex; flex-wrap: wrap; gap: 6px 18px; list-style: none; margin: 0; padding: 0; font-size: 0.9rem; color: var(--on-navy-muted); }
.trust li::before { content: "✓ "; color: var(--on-navy-accent); font-weight: 600; }
.app-get { display: inline-flex; align-items: center; gap: 12px; padding: 8px 20px 8px 8px; border-radius: 18px; background: #fff; color: #0f1a2e; text-decoration: none; box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25); }
.app-get img { width: 44px; height: 44px; border-radius: 23%; }
.app-get span { display: grid; line-height: 1.2; }
.app-get small { font-size: 0.74rem; color: #55627a; font-weight: 450; }
.app-get b { font-size: 1.05rem; font-weight: 650; letter-spacing: -0.01em; }
.app-get:hover { transform: translateY(-1px); }
.phone-stage { position: relative; justify-self: center; align-self: end; width: min(100%, 330px); }
.phone-stage::before { content: ""; position: absolute; inset: 10% -30% -10%; background: radial-gradient(closest-side, rgba(91, 155, 255, 0.35), rgba(91, 155, 255, 0)); }
.phone { position: relative; border: 10px solid #1b2436; border-bottom: 0; border-radius: 46px 46px 0 0; overflow: hidden; background: #f3f6fa; box-shadow: 0 30px 60px rgba(0, 0, 0, 0.35); aspect-ratio: 560 / 900; }
.phone img { width: 100%; height: 100%; object-fit: cover; object-position: top; }
.float-card { position: absolute; left: -36px; top: 46%; display: flex; align-items: center; gap: 10px; padding: 10px 14px 10px 10px; border-radius: 16px; background: rgba(255, 255, 255, 0.96); color: #0f1a2e; box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25); font-size: 0.82rem; line-height: 1.25; }
.float-card img { width: 38px; height: 38px; border-radius: 23%; }
.float-card b { display: block; font-weight: 650; font-size: 0.92rem; }

/* Section heads */
.sec-head { display: flex; justify-content: space-between; align-items: end; gap: 12px 24px; flex-wrap: wrap; }
.sec-head .stack { gap: 8px; }
.sec-head p { color: var(--muted); max-width: 36rem; }
.page-head { display: grid; gap: 12px; padding-top: 48px; }
.grades { display: flex; gap: 6px; flex-wrap: wrap; }
.grades a, .grades span { font-size: 0.82rem; font-weight: 500; min-width: 2.2rem; text-align: center; padding: 6px 12px; border-radius: 999px; background: var(--panel); color: var(--muted); text-decoration: none; }
.grades a:hover { color: var(--blue); }
.grades span.on { background: var(--ink); color: var(--page); }

/* Topic cards */
.topics { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 290px), 1fr)); gap: 18px; }
.topic { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 14px 22px; display: grid; gap: 8px; align-content: start; text-decoration: none; color: inherit; box-shadow: var(--shadow); }
.topic > :not(.pic-box) { margin-inline: 8px; }
a.topic:hover { box-shadow: var(--shadow-lift); transform: translateY(-2px); }
.topic h3 { font-size: 1.1rem; font-weight: 620; }
.topic p { font-size: 0.93rem; color: var(--muted); }
.pic-box { height: 112px; display: flex; align-items: center; justify-content: center; background: var(--panel); border-radius: 16px; margin-bottom: 8px; padding: 12px; }
.pic-box svg { max-height: 72px; width: auto; max-width: 100%; }
.gr { font-size: 0.78rem; font-weight: 550; color: var(--blue); letter-spacing: 0.02em; }
.tag { font-size: 0.7rem; font-weight: 600; background: var(--amber-soft); color: var(--amber-ink); padding: 2px 9px; border-radius: 999px; vertical-align: 2px; margin-left: 6px; white-space: nowrap; }
.sheet-card .dl { color: var(--blue); font-weight: 500; font-size: 0.95rem; }
.sheet-card .pic-box { height: 190px; padding: 18px 0 0; align-items: flex-start; overflow: hidden; }
.sheet-card .pic-box img { width: 62%; border-radius: 4px 4px 0 0; box-shadow: 0 6px 20px rgba(15, 26, 46, 0.16); }

/* Pictures */
svg { overflow: visible; }
svg .grid { fill: none; stroke: var(--pic-grid); stroke-width: 2; }
svg .b { fill: var(--blue); }
svg .a { fill: var(--amber); }
svg .rod { fill: var(--blue-soft); stroke: var(--blue); stroke-width: 1.5; }
svg .rodline { stroke: var(--blue); stroke-width: 0.8; opacity: 0.6; }
svg .cube { fill: var(--cube); stroke: var(--amber); stroke-width: 1.5; }
svg .axis { fill: none; stroke: var(--muted); stroke-width: 2; }
svg .hop { fill: none; stroke: var(--amber); stroke-width: 2.2; }
svg .t { fill: var(--ink); font-family: var(--font); }
svg .t.small { font-size: 12px; }
svg .t.big { font-size: 26px; font-weight: 600; }
svg .t.accent { fill: var(--amber-ink); font-weight: 500; }
svg .t.clocknum { font-size: 10px; font-weight: 500; }
svg .t.strong { font-weight: 600; font-size: 13px; }
svg .face { fill: var(--card); stroke: var(--ink); stroke-width: 2; }
svg .hand-h { stroke: var(--ink); stroke-width: 4; stroke-linecap: round; }
svg .hand-m { stroke: var(--blue); stroke-width: 2.6; stroke-linecap: round; }
svg .ink { fill: var(--ink); }
svg .shape-b { fill: var(--blue-soft); stroke: var(--blue); stroke-width: 2; stroke-linejoin: round; }
svg .shape-a { fill: var(--amber-soft); stroke: var(--amber); stroke-width: 2; }
svg .sym { stroke: var(--ink); stroke-width: 1.5; stroke-dasharray: 4 4; }
svg .storybox { fill: var(--blue-soft); }
svg .cell { fill: var(--card); }
svg .none { fill: none; }
svg .edge { stroke: var(--ink); stroke-width: 1.5; stroke-linejoin: round; }
svg .g { fill: var(--blue); }

/* Two columns, featured guide, questions */
.two { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.featured { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 26px; align-items: center; }
.featured > svg { width: 140px; height: auto; }
.featured a { font-weight: 500; text-decoration: none; }
.qs { display: grid; gap: 8px; align-content: start; }
.qs ul { list-style: none; margin: 0; padding: 0; }
.qs li a { display: flex; justify-content: space-between; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--line); color: var(--ink); text-decoration: none; font-weight: 400; }
.qs li:last-child a { border-bottom: 0; }
.qs li a::after { content: "→"; color: var(--blue); }
.qs li a:hover { color: var(--blue); }

/* Worksheets card */
.sheets { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 32px; align-items: center; background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow); }
.sheets p { color: var(--muted); }
.fan { position: relative; width: 170px; height: 190px; }
.fan img { position: absolute; width: 124px; border-radius: 4px; background: #fff; box-shadow: 0 6px 18px rgba(15, 26, 46, 0.16); border: 1px solid #e3e8f0; }
.fan img:nth-child(1) { left: 0; top: 18px; transform: rotate(-8deg); }
.fan img:nth-child(2) { left: 22px; top: 8px; transform: rotate(-2deg); }
.fan img:nth-child(3) { left: 44px; top: 0; transform: rotate(5deg); }
.fan.one { width: 140px; }
.fan.one img { left: 8px; top: 4px; transform: rotate(-3deg); }

/* App band */
.app-band { border-radius: 32px; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 32px; align-items: end; padding: clamp(28px, 5vw, 52px) clamp(24px, 5vw, 56px) 0; overflow: hidden; background: radial-gradient(120% 120% at 90% 0%, var(--navy-2) 0%, var(--navy) 65%); color: var(--on-navy); }
.app-band .copy { display: grid; gap: 18px; padding-bottom: clamp(28px, 5vw, 52px); }
.app-band .head { display: flex; gap: 18px; align-items: center; }
.app-band .head img { width: 72px; height: 72px; border-radius: 23%; box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3); }
.app-band .eyebrow { color: var(--on-navy-accent); }
.app-band ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 24px; color: var(--on-navy-muted); }
.app-band li::before { content: "✓ "; color: var(--on-navy-accent); font-weight: 600; }
.app-band .more { color: var(--on-navy); }
.app-band .phone { width: 240px; border-width: 8px; border-radius: 38px 38px 0 0; }

/* Topics page by grade */
.grade-list { display: grid; gap: 12px; }
.grade-row { background: var(--panel); border-radius: 20px; padding: 20px 24px; display: grid; grid-template-columns: 9rem minmax(0, 1fr); gap: 6px 20px; scroll-margin-top: 80px; }
.grade-row h3 { font-size: 1.05rem; grid-row: span 2; }
.grade-row ul { margin: 0; padding-left: 1.1em; color: var(--muted); font-size: 0.96rem; display: grid; gap: 2px; }
.grade-row li::marker, .bullets li::marker, .prose li::marker { color: var(--amber); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.chip { font-size: 0.82rem; padding: 4px 11px; border-radius: 999px; background: var(--card); color: var(--blue); text-decoration: none; font-weight: 500; border: 1px solid var(--line); }
.chip:hover { border-color: var(--blue); }

/* Topic page */
.crumbs { font-size: 0.88rem; color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px; padding-top: 28px; margin-bottom: -48px; }
.crumbs a { color: var(--muted); }
.topic-hero { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 32px; align-items: center; }
.topic-hero h1 { font-size: clamp(2rem, 4.4vw, 3rem); }
.topic-hero .hero-pic { background: var(--card); border-radius: 20px; padding: 28px; box-shadow: var(--shadow); }
.topic-hero .hero-pic svg { width: clamp(140px, 22vw, 240px); height: auto; }
.learn { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.learn li { display: grid; grid-template-columns: 2.2rem minmax(0, 1fr); gap: 12px; align-items: start; }
.gtag { display: inline-grid; place-items: center; width: 2.2rem; height: 2.2rem; border-radius: 50%; background: var(--blue-soft); color: var(--blue); font-weight: 600; font-size: 0.9rem; }
.bullets { margin: 0; padding-left: 1.1em; display: grid; gap: 10px; }
.guide-link { background: var(--card); border: 1px solid var(--line); box-shadow: var(--shadow); }
.guide-link h2 a { color: var(--ink); text-decoration: none; }
.guide-link h2 a:hover { color: var(--blue); }

/* Guide article */
.guide { max-width: 46rem; display: grid; gap: 32px; }
.guide header { padding-top: 56px; }
.guide h1 { font-size: clamp(2rem, 4.4vw, 2.8rem); }
.prose { display: grid; gap: 14px; }
.prose section { display: grid; gap: 12px; }
.prose h2 { font-size: 1.4rem; margin-top: 12px; }
.prose ul, .prose ol { margin: 0; padding-left: 1.2em; display: grid; gap: 6px; }
.prose figure { margin: 4px 0; background: var(--panel); border-radius: 20px; padding: 24px; display: grid; gap: 14px; justify-items: start; }
.prose figure svg { max-width: 100%; height: auto; }
.prose figcaption { color: var(--muted); font-size: 0.95rem; }
.prose .steps { list-style: none; padding: 0; counter-reset: step; gap: 12px; }
.prose .steps li { counter-increment: step; background: var(--panel); border-radius: 20px; padding: 18px 20px 18px 56px; display: grid; gap: 10px; position: relative; justify-items: start; }
.prose .steps li::before { content: counter(step); position: absolute; left: 18px; top: 18px; width: 26px; height: 26px; border-radius: 50%; background: var(--amber); color: #fff; font-weight: 600; font-size: 0.85rem; display: grid; place-items: center; }
.prose .steps svg { max-width: 100%; height: auto; }
.prose .plain { gap: 8px; }

/* Questions page */
.qa-list { display: grid; gap: 14px; max-width: 46rem; }
.qa { display: grid; gap: 10px; scroll-margin-top: 80px; }
.qa:target { outline: 2px solid var(--amber); }

/* Printables page */
.plus-note { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 24px; align-items: center; }
.plus-note img { width: 100px; }
.plus-note p { color: var(--muted); }

/* 404 */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 32px; align-items: center; padding-top: 56px; }
.hero .lead { margin-block: 14px; }
.hero .eaglet { width: clamp(150px, 24vw, 230px); }

/* Footer */
.foot { border-top: 1px solid var(--line); padding-block: 32px 44px; color: var(--muted); font-size: 0.92rem; }
.foot .wrap { display: flex; flex-wrap: wrap; gap: 10px 24px; justify-content: space-between; align-items: center; }
.foot .brand b { font-size: 1.05rem; }
.foot .brand img { width: 28px; height: 28px; }
.foot nav { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.foot a { color: var(--muted); text-decoration: none; }
.foot a:hover { color: var(--ink); }

@media (prefers-reduced-motion: no-preference) {
  .topic, .button, .app-get, .chip { transition: transform 0.18s, box-shadow 0.18s, border-color 0.15s, filter 0.15s; }
}
@media (max-width: 860px) {
  .home-hero { grid-template-columns: minmax(0, 1fr); gap: 8px; }
  .phone-stage { width: min(78%, 300px); }
  .phone { aspect-ratio: 560 / 640; }
  .float-card { left: -24px; top: 22%; }
  .app-band { grid-template-columns: minmax(0, 1fr); }
  .app-band .phone { display: none; }
}
@media (max-width: 760px) {
  main { gap: 52px; }
  .two, .featured, .topic-hero, .grade-row { grid-template-columns: minmax(0, 1fr); }
  .grade-row h3 { grid-row: auto; }
  .sheets, .plus-note, .hero { grid-template-columns: minmax(0, 1fr); }
  .plus-note img { display: none; }
  .topic-hero .hero-pic { order: -1; justify-self: start; }
  .app-band ul { grid-template-columns: minmax(0, 1fr); }
  .top { position: static; }
  .top .wrap { justify-content: center; }
  .float-card { display: none; }
}
@media (max-width: 480px) {
  .nav { gap: 6px 14px; font-size: 0.9rem; justify-content: center; }
}
@media print {
  .top, .foot, .app-band, .sheets { display: none; }
}