/* ==========================================================================
   GenAI Magazine — Shared Stylesheet
   Brand reference: docs/brandbook.md
   ========================================================================== */

:root {
  /* Color system — extracted from Issue 15 cover art */
  --color-ink: #0b0c0e;            /* near-black, primary dark background */
  --color-ink-soft: #16181b;       /* elevated dark surface (cards on dark) */
  --color-paper: #faf7f2;          /* warm off-white, primary light background */
  --color-paper-soft: #f1ece3;     /* warm light elevated surface */
  --color-amber: #e3a24a;          /* primary accent — "Gen" gold */
  --color-amber-deep: #c07f2c;     /* amber, darker, for text-on-light accents */
  --color-teal: #5fc9c9;           /* secondary accent — "AI" cyan */
  --color-teal-deep: #2f8f8f;      /* teal, darker, for text-on-light accents */
  --color-text: #1c1b19;           /* body text on light */
  --color-text-muted: #5c5951;     /* secondary text on light */
  --color-text-on-dark: #f4f1ea;   /* body text on dark */
  --color-text-on-dark-muted: #b6b2a8;
  --color-border: #e3ddd0;         /* hairline border on light */
  --color-border-dark: #2a2c2f;    /* hairline border on dark */

  /* Typography */
  --font-body: 'Assistant', 'Segoe UI', system-ui, sans-serif;
  --font-display: 'Assistant', 'Segoe UI', system-ui, sans-serif;

  /* Spacing scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;
  --space-7: 7rem;

  /* Layout */
  --content-width: 1200px;
  --radius: 6px;
  --radius-lg: 14px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--color-paper);
  color: var(--color-text);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 var(--space-2);
}

h1 { font-size: clamp(2.1rem, 4.2vw, 3.4rem); font-weight: 800; }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

p { margin: 0 0 var(--space-2); }

.container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-amber-deep);
}

section.on-dark .eyebrow,
.on-dark .eyebrow { color: var(--color-amber); }

.section {
  padding: var(--space-6) 0;
}

.section-head {
  max-width: 720px;
  margin-bottom: var(--space-5);
}

.section-head p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  padding: 0.85em 1.6em;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.98rem;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--color-amber);
  color: var(--color-ink);
}
.btn-primary:hover { background: #edb56a; }

.btn-outline {
  background: transparent;
  border-color: currentColor;
  color: var(--color-text-on-dark);
}
.on-light .btn-outline,
.btn-outline.on-light { color: var(--color-text); border-color: var(--color-border); }
.btn-outline:hover { background: rgba(255,255,255,0.08); }
.btn-outline.on-light:hover { background: rgba(0,0,0,0.04); }

.btn-teal {
  background: var(--color-teal);
  color: var(--color-ink);
}
.btn-teal:hover { background: #7ad6d6; }

.btn-icon {
  width: 1.1em;
  height: 1.1em;
  flex-shrink: 0;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 12, 14, 0.92);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--color-border-dark);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 76px;
}

.logo {
  display: inline-flex;
  align-items: baseline;
  gap: 0.15em;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--color-text-on-dark);
  letter-spacing: -0.01em;
}
.logo span.logo-gen { color: var(--color-amber); }
.logo span.logo-ai { color: var(--color-teal); }
.logo .logo-sub {
  font-size: 0.62em;
  font-weight: 600;
  color: var(--color-text-on-dark-muted);
  margin-inline-start: 0.4em;
}

.main-nav ul {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--space-4);
  margin: 0;
  padding: 0;
}

.main-nav a {
  color: var(--color-text-on-dark-muted);
  font-weight: 600;
  font-size: 0.98rem;
  padding: 0.4em 0.1em;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--color-text-on-dark);
  border-color: var(--color-amber);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border-dark);
  border-radius: var(--radius);
  color: var(--color-text-on-dark);
  padding: 0.5em 0.7em;
  font-size: 1.2rem;
  cursor: pointer;
}

/* ---------- Hero ---------- */
.hero {
  background: var(--color-ink);
  color: var(--color-text-on-dark);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 55% at 78% 15%, rgba(95, 201, 201, 0.16), transparent 60%),
    radial-gradient(45% 40% at 15% 85%, rgba(227, 162, 74, 0.14), transparent 60%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-6);
  align-items: center;
}

.hero-copy .eyebrow { margin-bottom: var(--space-2); }

.hero-copy h1 {
  color: var(--color-text-on-dark);
}

.hero-copy .lede {
  font-size: 1.15rem;
  color: var(--color-text-on-dark-muted);
  max-width: 46ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

.hero-cover {
  position: relative;
  justify-self: center;
}

.hero-cover img {
  width: 100%;
  max-width: 340px;
  border-radius: var(--radius-lg);
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.06);
}

.hero-cover .issue-tag {
  position: absolute;
  top: -14px;
  inset-inline-start: -14px;
  background: var(--color-amber);
  color: var(--color-ink);
  font-weight: 800;
  font-size: 0.85rem;
  padding: 0.5em 1em;
  border-radius: 999px;
  box-shadow: 0 8px 20px -6px rgba(0,0,0,0.5);
}

/* ---------- Pull quote ---------- */
.pull-quote {
  border-inline-start: 4px solid var(--color-amber);
  padding-inline-start: var(--space-3);
  margin: var(--space-4) 0;
  font-size: 1.25rem;
  font-weight: 600;
  font-style: normal;
  line-height: 1.6;
  color: var(--color-text-on-dark);
}

.pull-quote footer {
  margin-top: var(--space-2);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-on-dark-muted);
}

.on-light .pull-quote,
.pull-quote.on-light {
  color: var(--color-text);
}

/* ---------- TOC teaser ---------- */
.section.toc-teaser {
  background: var(--color-paper);
}

.toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-border);
}

.toc-list li {
  display: grid;
  grid-template-columns: 3.2rem 1fr auto;
  gap: var(--space-3);
  align-items: baseline;
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-border);
}

.toc-page {
  font-weight: 800;
  color: var(--color-amber-deep);
  font-size: 1.1rem;
}

.toc-title {
  font-weight: 700;
  color: var(--color-text);
}

.toc-author {
  color: var(--color-text-muted);
  font-size: 0.92rem;
  white-space: nowrap;
}

.toc-list li.is-feature .toc-title { color: var(--color-teal-deep); }

/* ---------- Cards / grid ---------- */
.grid {
  display: grid;
  gap: var(--space-4);
}

.issues-grid {
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

.issue-card {
  background: var(--color-ink-soft);
  color: var(--color-text-on-dark);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border-dark);
  display: flex;
  flex-direction: column;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.issue-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px -18px rgba(0,0,0,0.5);
}

.issue-card .issue-cover {
  aspect-ratio: 1241 / 1755;
  overflow: hidden;
  background: var(--color-ink);
}

.issue-card .issue-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.issue-card-body {
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 0.5em;
  flex: 1;
}

.issue-card-body .issue-number {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-amber);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.issue-card-body h3 { margin-bottom: 0; font-size: 1.15rem; }

.issue-card-body .issue-date {
  color: var(--color-text-on-dark-muted);
  font-size: 0.9rem;
}

.issue-card-actions {
  display: flex;
  gap: 0.6em;
  margin-top: var(--space-2);
  flex-wrap: wrap;
}

.issue-card-actions .btn {
  padding: 0.6em 1.1em;
  font-size: 0.88rem;
}

.issue-card.is-placeholder {
  align-items: center;
  justify-content: center;
  border: 1.5px dashed var(--color-border-dark);
  background: transparent;
  color: var(--color-text-on-dark-muted);
}

.issue-card.is-placeholder .issue-cover {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.4rem;
  color: var(--color-border-dark);
}

.issue-card.is-placeholder .issue-card-body {
  text-align: center;
  align-items: center;
}

/* ---------- Generic dark/light section helpers ---------- */
.on-dark { background: var(--color-ink); color: var(--color-text-on-dark); }
.on-soft { background: var(--color-paper-soft); }

.on-dark h2, .on-dark h3 { color: var(--color-text-on-dark); }
.on-dark p { color: var(--color-text-on-dark-muted); }

/* ---------- About / masthead ---------- */
.masthead-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.masthead-card {
  background: var(--color-paper);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
}

.masthead-card .role {
  color: var(--color-amber-deep);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 0.3em;
}

.masthead-card .name {
  font-size: 1.1rem;
  font-weight: 700;
}

/* ---------- CTA band ---------- */
.cta-band {
  background: linear-gradient(135deg, #17181b, #0b0c0e);
  color: var(--color-text-on-dark);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(50% 80% at 50% 0%, rgba(227,162,74,0.16), transparent 70%);
}

.cta-band > * { position: relative; }

.cta-band h2 { color: var(--color-text-on-dark); }

.cta-band .btn-row {
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: var(--space-3);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-ink);
  color: var(--color-text-on-dark-muted);
  border-top: 1px solid var(--color-border-dark);
  padding: var(--space-5) 0 var(--space-3);
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
}

.footer-brand .logo { margin-bottom: var(--space-2); }
.footer-brand p { max-width: 40ch; font-size: 0.95rem; }

.footer-links h4 {
  color: var(--color-text-on-dark);
  font-size: 0.95rem;
  margin-bottom: var(--space-2);
}

.footer-links ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.6em; }
.footer-links a:hover { color: var(--color-text-on-dark); }

.footer-bottom {
  border-top: 1px solid var(--color-border-dark);
  padding-top: var(--space-3);
  font-size: 0.85rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
}

/* ---------- About page hero (simpler, no cover) ---------- */
.page-hero {
  background: var(--color-ink);
  color: var(--color-text-on-dark);
  padding: var(--space-6) 0 var(--space-5);
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(55% 60% at 85% 10%, rgba(95,201,201,0.14), transparent 60%);
  pointer-events: none;
}

.page-hero .container { position: relative; max-width: 820px; }
.page-hero h1 { color: var(--color-text-on-dark); }
.page-hero .lede { color: var(--color-text-on-dark-muted); font-size: 1.15rem; max-width: 60ch; }

/* ---------- Utility ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-5);
  align-items: start;
}

.stat-list { list-style: none; margin: 0; padding: 0; display: grid; gap: var(--space-2); }
.stat-list li { border-top: 1px solid var(--color-border); padding-top: var(--space-2); }

/* ---------- Responsive ---------- */
@media (max-width: 920px) {
  .hero .container { grid-template-columns: 1fr; }
  .hero-cover { order: -1; }
  .two-col { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .main-nav { position: fixed; inset-inline-end: 0; top: 76px; bottom: 0; width: min(78vw, 320px);
    background: var(--color-ink); border-inline-start: 1px solid var(--color-border-dark);
    transform: translateX(105%); transition: transform 0.25s ease; padding: var(--space-4); }
  html[dir="rtl"] .main-nav { transform: translateX(-105%); }
  .main-nav.is-open { transform: translateX(0); }
  .main-nav ul { flex-direction: column; align-items: flex-start; gap: var(--space-3); }
  .nav-toggle { display: inline-flex; }
  .section { padding: var(--space-5) 0; }
  .toc-list li { grid-template-columns: 2.4rem 1fr; }
  .toc-author { grid-column: 2 / 3; }
}