/* Adapted from Fizzy's layered CSS, design tokens and component patterns.
 * Copyright © 2025, 37signals LLC. License: /licenses/fizzy.txt. */
@layer reset, base, components, pages, utilities;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  body, h1, h2, h3, p { margin: 0; }
  img { display: block; max-inline-size: 100%; }
  input, button, textarea, select { font: inherit; }
  button { cursor: pointer; }
  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
  }
}

@layer base {
  :root {
    --color-canvas: #f8f9f6;
    --color-paper: #fff;
    --color-ink: #23382f;
    --color-muted: #68746d;
    --color-line: #dfe5dc;
    --color-accent: #286352;
    --color-soft: #eaf0e4;
    --color-blue: #eaf0f8;
    --font-sans: "Inter", "Adwaita Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --focus-ring: 3px solid #4a79c1;
    --main-width: 1160px;
  }
  html { color-scheme: light; scroll-padding-block-start: 2rem; }
  body { background: var(--color-canvas); color: var(--color-ink); font-family: var(--font-sans); line-height: 1.5; -webkit-font-smoothing: antialiased; min-block-size: 100dvh; display: flex; flex-direction: column; }
  a { color: inherit; text-decoration: none; }
  :is(a, button, input, textarea, select):focus-visible { outline: var(--focus-ring); outline-offset: 5px; }
  button:disabled { cursor: not-allowed; opacity: .5; }
  h1, h2, h3 { text-wrap: balance; line-height: 1.15; }
  h1 { font-size: clamp(2.25rem, 4.2vw, 3.6rem); letter-spacing: -.055em; font-weight: 650; }
  h2 { font-size: clamp(1.55rem, 2.5vw, 2rem); letter-spacing: -.04em; font-weight: 620; }
  h3 { font-size: 1.45rem; letter-spacing: -.035em; font-weight: 620; }
  p { text-wrap: pretty; }
  ::selection { background: #d7e7ba; }
  .site-main { inline-size: min(var(--main-width), calc(100% - 64px)); margin-inline: auto; flex: 1; padding-block-end: 72px; }
  .site-header { max-inline-size: 1440px; inline-size: 100%; margin-inline: auto; min-block-size: 100px; display: flex; align-items: center; gap: 36px; padding: 20px 40px; }
  .site-footer { border-block-start: 1px solid var(--color-line); padding: 26px 40px; display: flex; justify-content: space-between; color: var(--color-muted); font-size: .8rem; }
}

@layer components {
  .brand { display: inline-flex; align-items: center; gap: 9px; font-size: 1.4rem; letter-spacing: -.045em; font-weight: 760; }
  .brand__icon { background: var(--color-accent); color: white; border-radius: 12px; inline-size: 37px; block-size: 37px; display: grid; place-items: center; }
  .brand__icon svg { inline-size: 30px; }
  .brand__dot { color: var(--color-accent); }
  .main-nav { display: flex; gap: 4px; margin-inline: auto; }
  .nav__link { padding: 9px 17px; font-size: .85rem; border-radius: 99rem; color: var(--color-muted); font-weight: 550; }
  .nav__link[aria-current] { background: var(--color-paper); color: var(--color-ink); box-shadow: 0 1px 4px #24382f10, 0 0 0 1px #23382f0a; }
  .nav__link:hover { color: var(--color-ink); background: #ffffffa0; }
  .header-label { font-size: .75rem; color: var(--color-muted); display: flex; align-items: center; gap: 8px; }
  .status-dot { display: inline-block; inline-size: 6px; block-size: 6px; background: #5a8464; border-radius: 50%; }
  .eyebrow { display: inline-flex; align-items: center; gap: 9px; font-size: .68rem; letter-spacing: .12em; font-weight: 700; color: var(--color-muted); text-transform: uppercase; margin-block-end: 17px; }
  .lede { font-size: 1rem; color: var(--color-muted); line-height: 1.8; margin-block-start: 22px; }
  .btn { --btn-bg: white; --btn-color: var(--color-ink); display: inline-flex; align-items: center; justify-content: center; gap: 26px; padding: 13px 23px; border: 1px solid var(--color-line); background: var(--btn-bg); color: var(--btn-color); font-weight: 600; font-size: .9rem; border-radius: 99rem; min-block-size: 48px; cursor: pointer; transition: background .15s, transform .15s; }
  .btn:hover { transform: translateY(-1px); }
  .btn--primary { --btn-bg: var(--color-accent); --btn-color: white; border-color: var(--color-accent); }
  .btn--primary:hover { --btn-bg: #1e5142; }
  .text-link { display: inline-flex; align-items: center; gap: 12px; font-size: .85rem; font-weight: 600; text-underline-offset: 4px; }
  .text-link:hover { text-decoration: underline; }
  .actions { display: flex; align-items: center; gap: 25px; flex-wrap: wrap; margin-block-start: 29px; }
  .section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-block-end: 25px; }
  .section-heading .eyebrow { margin-block-end: 9px; }
  .section-heading > .text-link { margin-block-end: 4px; }
  .badge { border: 1px solid #23382f20; font-size: .68rem; font-weight: 550; padding: 5px 11px; border-radius: 99rem; }
  .set-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 13px; }
  .set-card { padding: 21px 19px; border: 1px solid var(--color-line); background: var(--color-paper); border-radius: 14px; display: flex; gap: 13px; align-items: center; min-block-size: 105px; transition: border-color .15s, box-shadow .15s; }
  .set-card:hover { border-color: #9eafa1; box-shadow: 0 3px 14px #23382f08; }
  .set-card__number { font-size: .76rem; font-weight: 600; color: var(--color-accent); background: #eff3eb; border-radius: 10px; min-inline-size: 39px; block-size: 39px; display: grid; place-items: center; }
  .set-card__body { display: flex; flex-direction: column; gap: 6px; }
  .set-card__body strong { font-size: .87rem; font-weight: 600; line-height: 1.4; }
  .set-card__body > span { font-size: .73rem; color: var(--color-muted); }
  .set-card__arrow { color: #849086; margin-inline-start: auto; }
  .count-label { color: var(--color-muted); font-size: .8rem; white-space: nowrap; }
  .panel { padding: 30px; background: var(--color-paper); border: 1px solid var(--color-line); border-radius: 20px; }
  .empty-state { text-align: center; padding-block: 60px; }
  .empty-state p { color: var(--color-muted); margin-block-start: 14px; }
  .flash { padding: 16px 20px; border-radius: 12px; background: var(--color-soft); margin-block: 18px; }
  .skip-link { position: fixed; inset-block-start: -100px; inset-inline-start: 20px; z-index: 100; }
  .skip-link:focus { inset-block-start: 10px; }
  .back-link { display: inline-flex; color: var(--color-muted); font-size: .85rem; margin-block: 32px; }
}

@layer pages {
  .hero { display: grid; grid-template-columns: 1fr 290px; gap: 45px; align-items: center; padding-block: 54px 55px; }
  .hero h1 { max-inline-size: 760px; }
  .hero__copy { position: relative; z-index: 1; }
  .road-art { block-size: 280px; position: relative; overflow: hidden; border-radius: 140px 140px 28px 28px; background: #e7eddd; transform: rotate(3deg); }
  .road-art__sun { position: absolute; inset: 29px auto auto 39px; inline-size: 50px; block-size: 50px; border-radius: 50%; background: #f8e6a5; }
  .road-art__road { position: absolute; inline-size: 152px; block-size: 330px; inset: 52px auto auto 116px; border: 48px solid #a4bba4; border-radius: 50% 50% 0 0; transform: rotate(-31deg); }
  .road-art__road i { position: absolute; inset: -25px; border: 2px dashed #f8f9f6; border-radius: inherit; }
  .road-art__sign { position: absolute; inset: 112px auto auto 42px; border: 6px solid white; background: var(--color-accent); color: white; border-radius: 50%; display: grid; place-items: center; inline-size: 66px; block-size: 66px; font-size: 2rem; font-weight: 700; transform: rotate(-10deg); box-shadow: 0 4px 10px #23382f12; }
  .road-art__caption { position: absolute; inset: auto auto 25px 24px; font-size: .8rem; font-style: italic; font-weight: 600; transform: rotate(-3deg); }
  .stats-strip { display: grid; grid-template-columns: 1.2fr 1fr 1fr 1fr; padding: 27px 0; border-block: 1px solid var(--color-line); gap: 20px; align-items: center; }
  .stats-strip > div { display: flex; align-items: baseline; gap: 12px; }
  .stats-strip strong { font-size: 1.8rem; font-weight: 620; letter-spacing: -.05em; }
  .stats-strip div > span { max-inline-size: 115px; font-size: .76rem; color: var(--color-muted); }
  .stats-strip > p { padding-inline-start: 23px; border-inline-start: 1px solid var(--color-line); font-size: .78rem; color: var(--color-muted); position: relative; }
  .small-check { float: inline-start; margin-inline-end: 10px; color: var(--color-accent); }
  .section-space { margin-block-start: 49px; }
  .mode-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
  .mode-card { display: flex; flex-direction: column; padding: 27px 29px; border-radius: 20px; border: 1px solid #23382f0a; transition: transform .15s, box-shadow .15s; }
  .mode-card:hover { transform: translateY(-2px); box-shadow: 0 5px 15px #23382f08; }
  .mode-card--practice { background: var(--color-soft); }
  .mode-card--exam { background: var(--color-blue); }
  .mode-card__top { display: flex; align-items: center; justify-content: space-between; margin-block-end: 26px; }
  .mode-icon { inline-size: 40px; block-size: 40px; display: grid; place-items: center; background: #ffffff90; border-radius: 12px; font-size: 1.6rem; }
  .mode-card p { font-size: .87rem; line-height: 1.75; color: var(--color-muted); max-inline-size: 370px; margin-block: 12px 25px; }
  .card-action { display: flex; align-items: center; justify-content: space-between; font-size: .81rem; font-weight: 650; margin-block-start: auto; }
  .card-action > span { font-size: 1.2rem; }
  .page-heading { padding-block: 48px 45px; max-inline-size: 900px; }
  .page-heading h1 { font-size: clamp(2.15rem, 4vw, 3.2rem); }
  .catalog-section { margin-block-end: 40px; }
  .catalog-section .section-heading { border-block-end: 1px solid var(--color-line); padding-block-end: 14px; }
  .catalog-section h2 { font-size: 1.3rem; }
  .set-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; padding-block: 30px; }
  .set-intro h1 { font-size: clamp(2rem, 4vw, 3rem); }
  .set-facts { display: flex; flex-wrap: wrap; gap: 14px 25px; margin-block: 25px; color: var(--color-muted); font-size: .85rem; }
  .set-facts strong { color: var(--color-ink); }
  .preview-image { padding: 10px; border: 1px solid var(--color-line); background: white; border-radius: 18px; }
  .preview-image img { border-radius: 10px; inline-size: 100%; aspect-ratio: 4/3; object-fit: contain; }
  .preview-image > span { display: block; font-size: .7rem; text-align: center; padding: 12px 0 4px; color: var(--color-muted); }
}

@layer utilities {
  .text-accent { color: var(--color-accent); }
  .visually-hidden { position: absolute; inline-size: 1px; block-size: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  @media (max-width: 1000px) {
    .header-label { display: none; }
    .main-nav { margin-inline: auto 0; }
    .hero { grid-template-columns: 1fr 210px; gap: 24px; }
    .road-art { block-size: 240px; }
    .set-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .stats-strip > div { flex-direction: column; gap: 0; }
  }
  @media (max-width: 640px) {
    .site-header { padding: 22px 20px 12px; flex-wrap: wrap; gap: 20px; }
    .brand { font-size: 1.25rem; }
    .main-nav { inline-size: 100%; margin: 0; padding: 4px; border-radius: 99px; background: #eaf0e7; gap: 2px; }
    .nav__link { flex: 1; text-align: center; padding: 10px 5px; font-size: .8rem; }
    .site-main { inline-size: calc(100% - 40px); padding-block-end: 40px; }
    .hero { display: block; padding-block: 36px; }
    .hero h1 { font-size: 2.6rem; }
    .hero .lede { max-inline-size: 34ch; }
    .road-art { display: none; }
    .desktop-only { display: none; }
    .eyebrow { font-size: .62rem; }
    .actions { gap: 20px; }
    .stats-strip { grid-template-columns: repeat(3, 1fr); gap: 13px; padding-block: 20px; }
    .stats-strip strong { font-size: 1.6rem; }
    .stats-strip div > span { font-size: .7rem; }
    .stats-strip > p { display: none; }
    .section-space { margin-block-start: 35px; }
    .section-heading { align-items: start; gap: 12px; }
    .section-heading .text-link { font-size: .73rem; text-align: end; }
    .mode-grid, .set-grid, .set-intro { grid-template-columns: 1fr; }
    .mode-card { padding: 23px; }
    .mode-card__top { margin-block-end: 20px; }
    .set-card { min-block-size: 90px; }
    .site-footer { padding: 22px 20px; flex-direction: column; gap: 6px; font-size: .72rem; }
    .page-heading { padding-block: 33px; }
    .set-intro { gap: 20px; padding-block-start: 15px; }
  }
}