/* ==========================================================================
   Alexa Ong — shared styles
   Each page sets a theme via a class on <body> (see bottom of file).
   ========================================================================== */

:root {
  --paper: #f8f7f3;
  --ink: #111111;
  --ink-soft: #3d3d3d;
  --muted: #6b6b6b;
  --line: #e6e4dd;
  --grid: rgba(17, 17, 17, 0.045);
  --highlight: #ffe14d;
  --red: #e23b2e;

  --bg: var(--paper);
  --accent: var(--highlight);

  --font-serif: "DM Serif Display", Georgia, "Times New Roman", serif;
  --font-display: "Inter Tight", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Inter", "Helvetica Neue", Arial, sans-serif;

  --max: 1160px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 10px;
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

main { flex: 1; }

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

a { color: inherit; }

p { margin: 0 0 1em; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin: 0 0 0.5em;
}

.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.placeholder {
  background: rgba(255, 225, 77, 0.35);
  border-bottom: 1px dashed rgba(17, 17, 17, 0.35);
  padding: 0 0.15em;
  border-radius: 3px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 8px;
  background: var(--ink);
  color: #fff;
  padding: 8px 14px;
  border-radius: 6px;
  z-index: 100;
}
.skip-link:focus { left: 8px; }

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Graph-paper background ---------- */

.grid-bg {
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 68px 68px;
  background-position: -1px -1px;
}

/* ---------- Header / nav ---------- */

.site-header {
  position: relative;
  z-index: 20;
  background: var(--bg);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 96px;
}

.wordmark {
  font-family: var(--font-serif);
  font-size: 30px;
  line-height: 1;
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.nav-list {
  display: flex;
  gap: 40px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink-soft);
  transition: color 0.2s;
}

.nav-list a:hover,
.nav-list a[aria-current="page"] { color: var(--ink); }

.nav-list a[aria-current="page"] .nav-label {
  background: linear-gradient(transparent 62%, var(--accent) 62%, var(--accent) 92%, transparent 92%);
}

/* Subtle tag that appears under each link on hover */
.nav-tag {
  position: absolute;
  top: calc(100% + 4px);
  left: 50%;
  transform: translate(-50%, -4px);
  font-size: 12px;
  font-weight: 400;
  color: var(--muted);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
}

.nav-list a:hover .nav-tag,
.nav-list a:focus-visible .nav-tag {
  opacity: 1;
  transform: translate(-50%, 0);
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  padding: 10px;
  margin-right: -10px;
  cursor: pointer;
  color: var(--ink);
}

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 24px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}
.nav-toggle-bars { position: relative; }
.nav-toggle-bars::before,
.nav-toggle-bars::after { content: ""; position: absolute; left: 0; }
.nav-toggle-bars::before { top: -7px; }
.nav-toggle-bars::after { top: 7px; }

.nav-open .nav-toggle-bars { background: transparent; }
.nav-open .nav-toggle-bars::before { transform: translateY(7px) rotate(45deg); }
.nav-open .nav-toggle-bars::after { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg);
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding-top: 32px;
  padding-bottom: 32px;
}

.site-footer .wordmark { font-size: 22px; }

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 15px;
}
.footer-nav a:hover { color: var(--ink); text-decoration: underline; }

.footer-note {
  width: 100%;
  font-size: 13px;
  color: var(--muted);
  margin: 0;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  text-decoration: none;
  padding: 16px 28px;
  border-radius: 8px;
  border: 2px solid var(--ink);
  background: var(--ink);
  color: #fff;
  transition: transform 0.15s, box-shadow 0.15s;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 var(--accent);
}

.btn .arrow { transition: transform 0.2s; }
.btn:hover .arrow { transform: translateX(4px); }

.btn-ghost {
  background: transparent;
  color: var(--ink);
}

/* ---------- Generic page sections ---------- */

.page-hero {
  padding: clamp(56px, 9vw, 120px) 0 clamp(40px, 6vw, 72px);
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 18px;
}

.page-title {
  font-size: clamp(44px, 8vw, 96px);
  letter-spacing: -0.05em;
  line-height: 0.95;
}

.lede {
  font-size: clamp(19px, 2.2vw, 23px);
  line-height: 1.5;
  color: var(--ink-soft);
  max-width: 680px;
}

.section { padding: clamp(40px, 6vw, 80px) 0; }

.section-title {
  font-size: clamp(30px, 4.4vw, 48px);
}

.marker {
  background: linear-gradient(transparent 55%, var(--accent) 55%, var(--accent) 90%, transparent 90%);
  padding: 0 0.08em;
}

/* ---------- Mobile ---------- */

@media (max-width: 820px) {
  .site-header .container { height: 72px; }
  .wordmark { font-size: 26px; }

  .nav-toggle { display: block; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 16px 30px rgba(0, 0, 0, 0.06);
    display: none;
  }

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

  .nav-list {
    flex-direction: column;
    gap: 0;
    padding: 8px var(--gutter) 16px;
  }

  .nav-list a {
    flex-direction: row;
    align-items: baseline;
    gap: 12px;
    padding: 14px 0;
    font-size: 20px;
    width: 100%;
    border-bottom: 1px solid var(--line);
  }

  .nav-list li:last-child a { border-bottom: 0; }

  .nav-tag {
    position: static;
    transform: none;
    opacity: 1;
    font-size: 13px;
  }
  .nav-list a:hover .nav-tag,
  .nav-list a:focus-visible .nav-tag { transform: none; }

  .site-footer .container { flex-direction: column; align-items: flex-start; }
}

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