/* ==========================================================================
   Story Spectrum — theme layer (built on top of base.css)
   Palette (DS-2): exactly four HEX from the dev prompt.
     #0E0C14 Void Ink       — primary background
     #1C1828 Story Shadow   — surface / card background
     #EDE9F4 Page Frost      — primary text
     #9B5DE5 Spectrum Violet — accent, links, flourishes
   Typography (DS-6): distinctive editorial serif + grotesque sans.
   No Google Fonts for this run (dev-prompt restriction) — no Inter/Roboto/
   Arial/bare system-ui as the design type.
   ========================================================================== */

:root {
  /* --- Palette ---------------------------------------------------------- */
  --color-bg: #0E0C14;       /* Void Ink */
  --color-surface: #1C1828;  /* Story Shadow */
  --color-text: #EDE9F4;     /* Page Frost */
  --color-accent: #9B5DE5;   /* Spectrum Violet */

  /* Derived tones — all built from the four HEX via color-mix, no new HEX */
  --color-muted: color-mix(in srgb, var(--color-text) 62%, var(--color-bg));
  --color-border: color-mix(in srgb, var(--color-text) 14%, var(--color-bg));
  --color-surface-2: color-mix(in srgb, var(--color-surface) 70%, var(--color-bg));
  --color-accent-soft: color-mix(in srgb, var(--color-accent) 18%, var(--color-bg));
  --color-accent-glow: color-mix(in srgb, var(--color-accent) 32%, transparent);

  /* --- Type pairing ----------------------------------------------------- */
  --font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --font-sans: "Optima", "Avenir Next", "Avenir", "Gill Sans", "Gill Sans MT", "Futura", "Trebuchet MS", sans-serif;
}

/* --- Document ----------------------------------------------------------- */
html {
  background-color: var(--color-bg);
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-serif);
  /* Spectrum: a faint violet aura emanating from the top — CSS-only, no raster */
  background-image:
    radial-gradient(120% 60% at 50% -10%, var(--color-accent-soft) 0%, transparent 55%),
    radial-gradient(80% 40% at 100% 0%, color-mix(in srgb, var(--color-accent) 8%, transparent) 0%, transparent 60%);
  background-repeat: no-repeat;
  background-attachment: fixed;
}

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

/* --- Links -------------------------------------------------------------- */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 160ms ease, opacity 160ms ease;
}
a:hover,
a:focus-visible {
  color: var(--color-text);
  text-decoration: underline;
}
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* --- Typography --------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  color: var(--color-text);
  letter-spacing: -0.01em;
}

p {
  color: var(--color-text);
}

.eyebrow {
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-accent);
}

.lead {
  font-size: var(--text-lg);
  line-height: var(--leading-snug);
  color: var(--color-muted);
}

/* --- Skip link ---------------------------------------------------------- */
.skip-link {
  position: absolute;
  left: var(--space-sm);
  top: var(--space-sm);
  z-index: 100;
  background: var(--color-accent);
  color: var(--color-bg);
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transform: translateY(-200%);
  transition: transform 160ms ease;
}
.skip-link:focus {
  transform: translateY(0);
  text-decoration: none;
}

/* --- Site header / nav -------------------------------------------------- */
.site-header {
  border-block-end: var(--border-width) solid var(--color-border);
  background: color-mix(in srgb, var(--color-bg) 86%, transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  padding-block: var(--space-sm);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2xs);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: var(--text-lg);
  letter-spacing: 0.01em;
  color: var(--color-text);
}
.brand:hover,
.brand:focus-visible {
  color: var(--color-text);
  text-decoration: none;
}
.brand__mark {
  display: inline-block;
  width: 0.7em;
  height: 0.7em;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-text));
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}
.brand__spectrum {
  color: var(--color-accent);
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  list-style: none;
  padding: 0;
  margin: 0;
}
.site-nav a {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-muted);
  padding-block: var(--space-3xs);
  position: relative;
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 200ms ease;
}
.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a[aria-current="page"] {
  color: var(--color-text);
  text-decoration: none;
}
.site-nav a:hover::after,
.site-nav a:focus-visible::after,
.site-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

/* --- Hero --------------------------------------------------------------- */
.hero {
  padding-block: var(--space-2xl) var(--space-xl);
  border-block-end: var(--border-width) solid var(--color-border);
}
.hero__inner {
  max-width: 54rem;
}
.hero h1 {
  margin-block-start: var(--space-sm);
  font-size: var(--text-4xl);
  line-height: 1.05;
}
.hero h1 .accent {
  color: var(--color-accent);
}
.hero .lead {
  margin-block-start: var(--space-md);
  max-width: 42rem;
}

/* --- Section heading with accent rule ---------------------------------- */
.section-head {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-block-end: var(--space-lg);
}
.section-head h2 {
  font-size: var(--text-2xl);
  white-space: nowrap;
}
.section-head::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
}

/* --- Article cards ------------------------------------------------------ */
.card-grid {
  --grid-min: 17rem;
  --grid-gap: var(--space-lg);
}

.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding: var(--space-lg);
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
  transition: transform 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}
.card::before {
  content: "";
  position: absolute;
  inset-block: 0;
  inset-inline-start: 0;
  width: 3px;
  background: var(--color-accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 260ms ease;
}
.card:hover,
.card:focus-within {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--color-accent) 50%, var(--color-border));
  box-shadow: 0 18px 40px -24px var(--color-accent-glow);
}
.card:hover::before,
.card:focus-within::before {
  transform: scaleY(1);
}
.card__kicker {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-accent);
}
.card__title {
  font-size: var(--text-xl);
  line-height: var(--leading-snug);
}
.card__title a {
  color: var(--color-text);
}
.card__title a:hover,
.card__title a:focus-visible {
  color: var(--color-accent);
  text-decoration: none;
}
.card__dek {
  color: var(--color-muted);
  font-size: var(--text-base);
}
.card__more {
  margin-block-start: auto;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-accent);
}

/* Featured card spans wider on roomy viewports */
.card--featured {
  background:
    linear-gradient(135deg, var(--color-accent-soft), transparent 60%),
    var(--color-surface);
  border-color: color-mix(in srgb, var(--color-accent) 38%, var(--color-border));
}
@media (min-width: 768px) {
  .card--featured {
    grid-column: 1 / -1;
  }
  .card--featured .card__title {
    font-size: var(--text-2xl);
  }
}

/* --- Editorial index list (numbered, but NOT thumbnail listicle) -------- */
.index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-block-start: var(--border-width) solid var(--color-border);
}
.index-list li {
  border-block-end: var(--border-width) solid var(--color-border);
}
.index-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-md);
  align-items: baseline;
  padding-block: var(--space-md);
  transition: padding-inline 200ms ease;
}
.index-item:hover,
.index-item:focus-within {
  padding-inline-start: var(--space-2xs);
}
.index-item__num {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-accent);
  letter-spacing: 0.1em;
}
.index-item__title {
  font-size: var(--text-xl);
  line-height: var(--leading-snug);
  font-family: var(--font-sans);
  font-weight: 600;
}
.index-item__title a {
  color: var(--color-text);
}
.index-item__title a:hover,
.index-item__title a:focus-visible {
  color: var(--color-accent);
  text-decoration: none;
}

/* --- Curated links (thematic hub) --------------------------------------- */
.curated {
  display: grid;
  gap: var(--space-md);
}
.curated__item {
  display: block;
  padding: var(--space-md) var(--space-lg);
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-inline-start: 3px solid var(--color-accent);
  border-radius: var(--radius-sm);
  transition: background 200ms ease, transform 200ms ease;
}
.curated__item:hover,
.curated__item:focus-visible {
  background: var(--color-surface-2);
  transform: translateX(4px);
  text-decoration: none;
}
.curated__item h3 {
  font-size: var(--text-lg);
  color: var(--color-text);
  font-family: var(--font-sans);
}
.curated__item p {
  margin-block-start: var(--space-2xs);
  color: var(--color-muted);
  font-size: var(--text-sm);
}

/* --- Article reading page ----------------------------------------------- */
.article-header {
  padding-block: var(--space-2xl) var(--space-lg);
  border-block-end: var(--border-width) solid var(--color-border);
}
.article-header__inner {
  max-width: var(--measure);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

@media (min-width: 768px) {
  .article-header__inner {
    padding-inline: var(--space-xl);
  }
}
.article-header h1 {
  font-size: var(--text-3xl);
  line-height: 1.1;
  margin-block-start: var(--space-sm);
}
.article-header h1::after {
  content: "";
  display: block;
  width: 4rem;
  height: 3px;
  margin-block-start: var(--space-md);
  background: var(--color-accent);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-accent);
}
.back-link::before {
  content: "\2190";
}

.prose {
  margin-inline: auto;
  font-size: var(--text-base);
}
.prose h2 {
  font-size: var(--text-2xl);
  color: var(--color-text);
}
.prose h2::before {
  /* chapter-marker flourish in Spectrum Violet */
  content: "";
  display: block;
  width: 2rem;
  height: 2px;
  margin-block-end: var(--space-xs);
  background: var(--color-accent);
}
.prose h3 { font-size: var(--text-xl); color: var(--color-text); }
.prose h4 { font-size: var(--text-lg); color: var(--color-accent); }
.prose h5 { font-size: var(--text-base); color: var(--color-muted); text-transform: uppercase; letter-spacing: 0.12em; }
.prose p { color: var(--color-text); }
.prose blockquote {
  border-inline-start: 3px solid var(--color-accent);
  padding-inline-start: var(--space-md);
  font-style: italic;
  color: var(--color-muted);
}
.prose a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-glow);
}
.prose a:hover,
.prose a:focus-visible {
  text-decoration-color: var(--color-accent);
  color: var(--color-text);
}

/* --- Footer ------------------------------------------------------------- */
.site-footer {
  margin-block-start: var(--space-lg);
  border-block-start: var(--border-width) solid var(--color-border);
  background: var(--color-surface);
  padding-block: var(--space-lg);
}
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: center;
  justify-content: space-between;
}
.site-footer__brand {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-text);
}
.site-footer__brand .brand__spectrum { color: var(--color-accent); }
.site-footer nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  list-style: none;
  margin: 0;
  padding: 0;
}
.site-footer a { color: var(--color-muted); font-family: var(--font-sans); font-size: var(--text-sm); }
.site-footer a:hover,
.site-footer a:focus-visible { color: var(--color-accent); text-decoration: none; }
.site-footer__note {
  margin-block-start: var(--space-md);
  color: var(--color-muted);
  font-size: var(--text-sm);
}

/* --- Reduced motion (in addition to base.css safety) -------------------- */
@media (prefers-reduced-motion: reduce) {
  .card:hover,
  .card:focus-within,
  .curated__item:hover,
  .index-item:hover { transform: none; }
}

/* ==========================================================================
   Tester fixes — CSS-only burger nav + 320px hardening (no JS)
   ========================================================================== */

/* Hidden checkbox drives nav visibility; the label is the visible button. */
.nav-toggle {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}
.nav-burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  margin-inline-start: auto;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}
.nav-burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 200ms ease, opacity 160ms ease;
}
.nav-toggle:focus-visible ~ .nav-burger {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

@media (max-width: 767px) {
  .nav-burger { display: inline-flex; }
  .site-nav {
    flex-basis: 100%;
    width: 100%;
    display: none;
  }
  .nav-toggle:checked ~ .site-nav { display: block; }
  .site-nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
    padding-block: var(--space-xs) var(--space-2xs);
  }
  .nav-toggle:checked ~ .nav-burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle:checked ~ .nav-burger span:nth-child(2) { opacity: 0; }
  .nav-toggle:checked ~ .nav-burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* Narrow-viewport hardening — shrink display type so long words don't break
   mid-word at 320px, with hyphenation as a safety net. */
@media (max-width: 30rem) {
  :root {
    --text-4xl: clamp(1.85rem, 1.2rem + 4.5vw, 2.75rem);
    --text-3xl: clamp(1.55rem, 1.1rem + 3.2vw, 2.25rem);
    --text-2xl: clamp(1.35rem, 1rem + 2.2vw, 1.95rem);
  }
  h1, h2, h3 {
    hyphens: auto;
    -webkit-hyphens: auto;
  }
}