/* URL TL;DR — visual system
   Brand palette inspired by the supplied logo.
   Keep this stylesheet framework-free and reusable. */

:root {
  color-scheme: light;
  --color-bg: #f4f5f2;
  --color-surface: #ffffff;
  --color-ink: #14171d;
  --color-muted: #606773;
  --color-accent: #e53620;
  --color-accent-hover: #c92b19;
  --color-border: #d8dbd8;
  --color-focus: #1e63d6;

  --font-sans: Inter, "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-serif: Georgia, "Times New Roman", serif;

  --content-width: 1200px;
  --reading-width: 760px;
  --space-1: 0.35rem;
  --space-2: 0.65rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 6rem;

  --radius-sm: 4px;
  --radius-md: 10px;
  --shadow-soft: 0 10px 32px rgb(20 23 29 / 6%);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img,
svg,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--color-accent-hover);
}

button,
input,
textarea,
select {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 4px;
}

::selection {
  background: var(--color-accent);
  color: #fff;
}

.skip-link {
  position: absolute;
  z-index: 1000;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 1rem;
  transform: translateY(-160%);
  border-radius: var(--radius-sm);
  background: var(--color-ink);
  color: #fff;
}

.skip-link:focus {
  transform: translateY(0);
}

.container {
  width: min(calc(100% - 2.5rem), var(--content-width));
  margin-inline: auto;
}

.reading-width {
  width: min(calc(100% - 2.5rem), var(--reading-width));
  margin-inline: auto;
}

.site-header {
  position: relative;
  z-index: 20;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.header-inner {
  display: flex;
  min-height: 118px;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.site-logo {
  display: inline-flex;
  align-items: center;
  flex: 0 1 270px;
}

.site-logo img {
  width: 100%;
  max-width: 270px;
  height: auto;
  object-fit: contain;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2.25rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  font-size: 0.92rem;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a[aria-current="page"] {
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.45rem;
}

.nav-toggle {
  display: none;
  min-width: 44px;
  min-height: 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-ink);
  cursor: pointer;
}

.hero {
  padding-block: clamp(4rem, 10vw, 8rem);
}

.eyebrow {
  margin: 0 0 var(--space-3);
  color: var(--color-accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 950px;
  margin: 0;
  font-size: clamp(2.7rem, 7.5vw, 6.5rem);
  font-weight: 850;
  letter-spacing: -0.065em;
  line-height: 0.99;
}

.hero h1 em,
.editorial-emphasis {
  font-family: var(--font-serif);
  font-weight: 400;
  font-style: italic;
  letter-spacing: -0.045em;
}

.hero-copy {
  max-width: 690px;
  margin: var(--space-5) 0 0;
  color: var(--color-muted);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.15rem;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-sm);
  background: var(--color-ink);
  color: #fff;
  font-weight: 750;
  text-decoration: none;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}

.button:hover {
  border-color: var(--color-accent-hover);
  background: var(--color-accent-hover);
  color: #fff;
}

.button--secondary {
  background: transparent;
  color: var(--color-ink);
}

.button--secondary:hover {
  border-color: var(--color-ink);
  background: var(--color-ink);
  color: #fff;
}

.section {
  padding-block: var(--space-7);
  border-top: 1px solid var(--color-border);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 3.4rem);
  font-weight: 820;
  letter-spacing: -0.055em;
  line-height: 1.08;
}

.section-heading p {
  max-width: 440px;
  margin: 0;
  color: var(--color-muted);
}

.topic-grid,
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.topic-card,
.article-card {
  min-width: 0;
  padding: clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.topic-card {
  border-top: 3px solid var(--color-accent);
}

.topic-card h3,
.article-card h3 {
  margin: 0 0 var(--space-2);
  font-size: clamp(1.2rem, 2vw, 1.6rem);
  letter-spacing: -0.035em;
  line-height: 1.25;
}

.topic-card p,
.article-card p {
  margin: 0;
  color: var(--color-muted);
}

.card-link {
  display: inline-block;
  margin-top: var(--space-4);
  font-weight: 750;
  text-decoration-color: var(--color-accent);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-bottom: var(--space-3);
  color: var(--color-muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.article-card h3 a {
  text-decoration: none;
}

.article-card h3 a:hover {
  color: var(--color-accent-hover);
}

.tldr-panel {
  display: grid;
  grid-template-columns: minmax(150px, 0.7fr) minmax(0, 2fr);
  gap: var(--space-5);
  padding: clamp(1.5rem, 5vw, 3.5rem);
  border-left: 5px solid var(--color-accent);
  background: #e9ebe7;
}

.tldr-panel h2,
.tldr-panel h3 {
  margin: 0;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  letter-spacing: -0.05em;
  line-height: 1.1;
}

.tldr-panel p {
  margin-top: 0;
}

.tldr-panel p:last-child {
  margin-bottom: 0;
}

.tldr-panel ul {
  margin-bottom: 0;
  padding-left: 1.25rem;
}

.page-hero {
  padding-block: var(--space-7) var(--space-6);
}

.page-hero h1 {
  max-width: 900px;
  margin: 0;
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 850;
  letter-spacing: -0.06em;
  line-height: 1.02;
}

.page-hero p {
  max-width: 720px;
  color: var(--color-muted);
  font-size: 1.15rem;
}

.article-header {
  padding-block: var(--space-7) var(--space-5);
}

.article-header h1 {
  margin: 0;
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 850;
  letter-spacing: -0.06em;
  line-height: 1.03;
}

.article-summary {
  margin-top: var(--space-4);
  padding: var(--space-4);
  border-left: 4px solid var(--color-accent);
  background: #e9ebe7;
}

.article-summary h2 {
  margin-top: 0;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.article-body {
  padding-bottom: var(--space-8);
  font-size: 1.08rem;
}

.article-body h2 {
  margin-top: 2.5em;
  font-size: clamp(1.65rem, 3vw, 2.3rem);
  letter-spacing: -0.04em;
  line-height: 1.2;
}

.article-body h3 {
  margin-top: 2em;
  font-size: 1.35rem;
  line-height: 1.3;
}

.article-body li + li {
  margin-top: 0.45rem;
}

.article-body blockquote {
  margin: 2rem 0;
  padding: 0.25rem 0 0.25rem 1.5rem;
  border-left: 3px solid var(--color-accent);
  font-family: var(--font-serif);
  font-size: 1.45rem;
  font-style: italic;
}

.site-footer {
  padding-block: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.footer-inner {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: var(--space-5);
}

.footer-brand {
  max-width: 400px;
}

.footer-brand p,
.copyright {
  color: var(--color-muted);
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
}

.footer-links a {
  font-size: 0.9rem;
  font-weight: 650;
}

.not-found {
  min-height: 55vh;
  display: grid;
  align-content: center;
  padding-block: var(--space-7);
}

.not-found h1 {
  margin: 0;
  font-size: clamp(3rem, 8vw, 6rem);
  letter-spacing: -0.06em;
  line-height: 1;
}

@media (max-width: 800px) {
  .topic-grid,
  .article-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .section-heading {
    align-items: start;
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .container,
  .reading-width {
    width: min(calc(100% - 1.5rem), var(--content-width));
  }

  .header-inner {
    min-height: 72px;
  }

  .site-logo {
    flex-basis: 155px;
  }

  .site-logo img {
    max-width: 155px;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: none;
    padding: 0.5rem 1.25rem 1.25rem;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav ul {
    align-items: stretch;
    flex-direction: column;
    gap: 0;
  }

  .site-nav a {
    display: block;
    padding: 0.8rem 0;
  }

  .hero {
    padding-block: var(--space-7);
  }

  .topic-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

  .tldr-panel {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }

  .footer-inner {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  :root {
    --color-bg: #fff;
    --color-ink: #000;
    --color-muted: #333;
  }

  .site-header,
  .site-footer,
  .nav-toggle,
  .hero-actions,
  .card-link {
    display: none !important;
  }

  body {
    background: #fff;
    font-size: 11pt;
  }

  .container,
  .reading-width {
    width: 100%;
    max-width: none;
  }

  a {
    color: #000;
    text-decoration: none;
  }

  .article-body {
    padding: 0;
  }
}


/* URL TL;DR brand assets */
.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: .38rem;
  color: var(--color-ink);
  font-size: 1.65rem;
  font-weight: 900;
  letter-spacing: -.075em;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
}
.wordmark img { display: block; width: min(270px, 100%); height: auto; }
.wordmark > span { font-weight: 850; }
.wordmark b { font-weight: 900; }
.wordmark .slash { color: var(--color-accent); padding-inline: .015em; }
.wordmark:hover { color: var(--color-ink); }
.footer-wordmark { width: min(300px, 100%); }
.footer-wordmark img { width: 100%; max-width: 300px; }
.nav-toggle { gap: .5rem; }
.nav-toggle-label { font-size: .9rem; font-weight: 700; }
.article-card .sample-label {
  display: inline-block; margin-bottom: .65rem; padding: .15rem .45rem;
  border: 1px solid var(--color-border); color: var(--color-muted);
  font-size: .72rem; font-weight: 750; letter-spacing: .05em; text-transform: uppercase;
}
.topic-card { scroll-margin-top: 2rem; }
@media (max-width: 640px) {
  .header-inner { min-height: 90px; }
  .site-logo { flex: 0 1 190px; }
  .site-logo img { max-width: 190px; }
  .footer-wordmark { width: min(250px, 100%); }
}