/* ============================================================
   Arslan Kazmi · Project Directory
   Vanilla CSS — no framework. Dark-first, light theme via [data-theme].
   ============================================================ */

/* Design tokens (the :root + light-theme variables, fonts, and ds-* primitives) now live in
   the ak-design system and are loaded via index.html:
     https://arslankazmi.github.io/ak-design/dist/catalog.css
   This file keeps only the portfolio's own layout, components, 90s, and plain-view styles —
   all referencing var(--…) from that bundle. Edit the palette in the ak-design repo. */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

/* ---------- animated background ---------- */
.bg-orbs { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  animation: drift 22s ease-in-out infinite alternate;
}
.orb-a { width: 46vw; height: 46vw; left: -10vw; top: -12vw; background: radial-gradient(circle, var(--accent), transparent 70%); }
.orb-b { width: 40vw; height: 40vw; right: -12vw; top: 8vh; background: radial-gradient(circle, var(--accent-3), transparent 70%); animation-delay: -7s; }
.orb-c { width: 38vw; height: 38vw; left: 25vw; bottom: -18vw; background: radial-gradient(circle, var(--accent-2), transparent 70%); animation-delay: -13s; }
@keyframes drift {
  from { transform: translate3d(0,0,0) scale(1); }
  to   { transform: translate3d(4vw, 5vh, 0) scale(1.12); }
}

/* ---------- hero ---------- */
.hero {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(2.5rem, 7vw, 5.5rem) clamp(1.2rem, 4vw, 2.5rem) 1.5rem;
}
.hero-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.6rem; }
.kicker {
  font-family: var(--font-head);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-2);
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
}
.hero h1 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(2.4rem, 6.5vw, 4rem);
  line-height: 1.04;
  margin: 0 0 0.6rem;
  letter-spacing: -0.02em;
  background: linear-gradient(115deg, var(--text) 35%, var(--accent) 75%, var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.tagline {
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(1.05rem, 2.4vw, 1.4rem);
  color: var(--text);
  margin: 0 0 0.9rem;
}
.blurb { color: var(--text-dim); max-width: 60ch; font-size: 1.02rem; margin: 0 0 1.6rem; }

.hero-links { display: flex; flex-wrap: wrap; gap: 0.7rem; margin-bottom: 2rem; }
.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1.05rem;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  font-weight: 500;
  font-size: 0.92rem;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.hero-links a:hover { transform: translateY(-2px); border-color: var(--accent); background: var(--surface-2); }
.hero-links a.primary { background: linear-gradient(120deg, var(--accent), var(--accent-3)); border-color: transparent; color: #fff; }

.stats { display: flex; flex-wrap: wrap; gap: 2.2rem; margin: 0; padding-top: 0.5rem; border-top: 1px solid var(--border); }
.stats div { display: flex; flex-direction: column; }
.stats dt { font-size: 0.75rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-faint); }
.stats dd { margin: 0.15rem 0 0; font-family: var(--font-head); font-weight: 700; font-size: 1.5rem; }

/* ---------- controls ---------- */
.controls {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid var(--border);
  padding: 0.85rem 0;
}
.controls-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 clamp(1.2rem, 4vw, 2.5rem);
  display: flex;
  gap: 1.4rem;
  align-items: flex-end;
  flex-wrap: wrap;
}
.control-block { display: flex; flex-direction: column; gap: 0.4rem; }
.control-block.grow { flex: 1 1 240px; }
.control-label { font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-faint); }

.segmented { display: inline-flex; padding: 4px; gap: 2px; background: var(--surface); border: 1px solid var(--border); border-radius: 999px; }
.segmented button {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-dim);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.86rem;
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}
.segmented button:hover { color: var(--text); }
.segmented button[aria-selected="true"] {
  color: #fff;
  background: linear-gradient(120deg, var(--accent), var(--accent-3));
}
html[data-theme="light"] .segmented button[aria-selected="true"] { color: #fff; }

.search {
  width: 100%;
  padding: 0.6rem 0.95rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color 0.15s ease;
}
.search:focus { outline: none; border-color: var(--accent); }
.search::placeholder { color: var(--text-faint); }

.theme-toggle {
  width: 38px; height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 1.05rem;
  display: grid; place-items: center;
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.theme-toggle:hover { transform: rotate(-18deg); border-color: var(--accent); }

.active-filters {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 clamp(1.2rem, 4vw, 2.5rem);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.7rem;
}
.active-filters:empty { display: none; }
.filter-pill {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: linear-gradient(120deg, color-mix(in srgb, var(--accent) 26%, transparent), color-mix(in srgb, var(--accent-3) 26%, transparent));
  border: 1px solid var(--accent);
  color: var(--text);
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  font-size: 0.8rem;
  cursor: pointer;
}
.filter-pill .x { font-weight: 700; opacity: 0.8; }
.filter-clear { background: none; border: none; color: var(--text-faint); cursor: pointer; font-size: 0.8rem; text-decoration: underline; }

/* ---------- main / groups ---------- */
.main { max-width: var(--maxw); margin: 0 auto; padding: 2.2rem clamp(1.2rem, 4vw, 2.5rem) 4rem; }

.section-head { display: flex; align-items: baseline; gap: 0.8rem; margin: 0 0 1.1rem; flex-wrap: wrap; }
.section-head h2 {
  font-family: var(--font-head);
  font-size: 1.35rem;
  margin: 0;
  letter-spacing: -0.01em;
}
.section-sub { color: var(--text-faint); font-size: 0.9rem; margin: 0; }
.section-count {
  font-size: 0.74rem; color: var(--text-dim);
  border: 1px solid var(--border); border-radius: 999px;
  padding: 0.1rem 0.55rem; background: var(--surface);
}

/* ---------- spotlight band: Featured + Latest, set apart from the rest ---------- */
.spotlight {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: clamp(1.2rem, 3vw, 2.2rem);
  margin: 0 0 3rem;
}
/* `display: grid` above outranks the UA [hidden] rule, so re-assert it when hidden. */
.spotlight[hidden] { display: none; }
/* Featured and Latest are each their own bounded panel. */
.spotlight .featured-section,
.spotlight .latest-section {
  margin: 0; min-width: 0;
  padding: 1.4rem clamp(1.1rem, 2vw, 1.5rem);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 4px);
  background: linear-gradient(180deg, color-mix(in srgb, var(--surface) 70%, transparent), transparent);
}
/* Latest gets a distinct accent boundary so it reads as its own thing. */
.spotlight .latest-section {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border));
  background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 9%, var(--surface)), transparent);
}
@media (max-width: 860px) {
  .spotlight { grid-template-columns: 1fr; gap: 1.6rem; }
}

/* "NEW" badge on the latest card */
.badges { display: inline-flex; align-items: center; gap: 0.4rem; }
.new-badge {
  font-size: 0.62rem; font-weight: 700; letter-spacing: 0.06em;
  color: #fff; background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 999px; padding: 0.12rem 0.5rem; line-height: 1.4;
}
.card.is-latest { border-color: color-mix(in srgb, var(--accent) 55%, var(--border)); }

.group { margin-bottom: 2.6rem; scroll-margin-top: 90px; }
.group-bar { height: 3px; width: 46px; border-radius: 3px; margin-bottom: 0.9rem; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.1rem;
}

/* ---------- card ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.25rem 1.25rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}
.card::before {
  content: "";
  position: absolute; inset: 0 0 auto 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-3));
  opacity: 0; transition: opacity 0.18s ease;
}
.card:hover { transform: translateY(-4px); border-color: var(--border-strong); background: var(--surface-2); }
.card:hover::before { opacity: 1; }
.card.is-featured { border-color: color-mix(in srgb, var(--accent) 45%, var(--border)); }

.card-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 0.6rem; }
.card h3 { font-family: var(--font-head); font-weight: 600; font-size: 1.12rem; margin: 0; letter-spacing: -0.01em; }
.card h3 a:hover { color: var(--accent); }
.star { color: var(--accent-2); font-size: 0.9rem; flex-shrink: 0; }

.card-desc { color: var(--text-dim); font-size: 0.92rem; margin: 0; flex: 1; }

.meta-row { display: flex; flex-wrap: wrap; gap: 0.4rem; align-items: center; }
.lang-pill {
  display: inline-flex; align-items: center; gap: 0.35rem;
  font-size: 0.76rem; color: var(--text); font-weight: 500;
  padding: 0.18rem 0.55rem; border-radius: 999px;
  background: var(--surface-2); border: 1px solid var(--border);
}
.lang-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent-2); }

.tags { display: flex; flex-wrap: wrap; gap: 0.38rem; }
.tag {
  font-size: 0.74rem;
  padding: 0.18rem 0.55rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
}
.tag.lib { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }
.tag.kw {
  cursor: pointer;
  color: var(--text-dim);
  transition: color 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}
.tag.kw::before { content: "#"; opacity: 0.5; }
.tag.kw:hover { color: var(--text); border-color: var(--accent-3); background: var(--surface-2); }
.tag.kw.active { color: #fff; background: linear-gradient(120deg, var(--accent), var(--accent-3)); border-color: transparent; }

.tag-group-label { font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-faint); margin-right: 0.1rem; align-self: center; }

.card-foot { display: flex; align-items: center; justify-content: space-between; margin-top: 0.2rem; padding-top: 0.7rem; border-top: 1px solid var(--border); }
.card-links { display: inline-flex; align-items: center; gap: 0.9rem; flex-wrap: wrap; }
.repo-link, .docs-link { font-size: 0.85rem; font-weight: 600; display: inline-flex; align-items: center; gap: 0.3rem; }
.repo-link { color: var(--accent); }
.docs-link { color: var(--accent-2); }
.repo-link:hover, .docs-link:hover { gap: 0.55rem; }
.updated { font-size: 0.74rem; color: var(--text-faint); }

.empty { text-align: center; color: var(--text-faint); padding: 3rem 0; font-size: 1.05rem; }

/* ---------- footer ---------- */
.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 2rem clamp(1.2rem, 4vw, 2.5rem) 3rem;
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 0.82rem;
  display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; justify-content: space-between;
}
.footer code { background: var(--surface-2); padding: 0.1rem 0.35rem; border-radius: 5px; color: var(--text-dim); }
.footer-links a { color: var(--text-dim); }
.footer-links a:hover { color: var(--accent); }

/* ---------- entrance animation ---------- */
@media (prefers-reduced-motion: no-preference) {
  .card { animation: rise 0.5s cubic-bezier(0.22, 1, 0.36, 1) backwards; }
  @keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }
  .orb { will-change: transform; }
}
@media (prefers-reduced-motion: reduce) {
  .orb { animation: none; }
}

@media (max-width: 600px) {
  .stats { gap: 1.4rem; }
  .controls-inner { gap: 0.9rem; }
  .card-grid { grid-template-columns: 1fr; }
}

/* ---------- toggles ---------- */
.toggles { display: flex; align-items: center; gap: 0.5rem; }
.era-toggle, .view-toggle, .copy-btn {
  font-family: var(--font-body);
  font-size: 0.82rem; font-weight: 600;
  padding: 0.4rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.15s ease;
}
.era-toggle:hover, .view-toggle:hover, .copy-btn:hover { border-color: var(--accent-2); background: var(--surface-2); transform: translateY(-1px); }
.copy-btn { padding: 0.55rem 0.9rem; }

/* ---------- no-JS fallback (works in any era) ---------- */
.noscript-fallback {
  border: 1px solid var(--border-strong);
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
}
.noscript-fallback h2 { font-family: var(--font-head); margin-top: 0; }
.noscript-fallback ul { line-height: 1.9; padding-left: 1.2rem; }
.noscript-fallback a { color: var(--accent); text-decoration: underline; }

/* ============================================================
   PLAIN VIEW — html[data-view="plain"]
   A raw HTML <table> with near-zero CSS, so the whole page can be
   selected and copy-pasted as clean text/markup. Strips all chrome.
   ============================================================ */
.plain-view { display: none; }
.plain-view table { border-collapse: collapse; width: 100%; font-size: 0.9rem; }
.plain-view th, .plain-view td { text-align: left; vertical-align: top; }
.plain-view th { background: #f0f0f0; }

html[data-view="plain"] { scroll-behavior: auto; }
html[data-view="plain"] body {
  background: #fff; color: #000;
  font-family: Georgia, "Times New Roman", Times, serif;
}
html[data-view="plain"] .plain-view { display: block; }
html[data-view="plain"] .bg-orbs,
html[data-view="plain"] .controls,
html[data-view="plain"] #spotlight,
html[data-view="plain"] #groups,
html[data-view="plain"] #empty,
html[data-view="plain"] .retro-only,
html[data-view="plain"] .hero-links,
html[data-view="plain"] .stats { display: none !important; }
html[data-view="plain"] .hero h1 {
  -webkit-text-fill-color: initial; background: none; color: #000;
  font-family: inherit; letter-spacing: 0;
}
html[data-view="plain"] .kicker { color: #555; background: none; border: none; padding: 0; }
html[data-view="plain"] .tagline, html[data-view="plain"] .blurb { color: #333; font-family: inherit; }
html[data-view="plain"] .hero, html[data-view="plain"] .main, html[data-view="plain"] .footer { max-width: 940px; }
html[data-view="plain"] a { color: #0000ee; text-decoration: underline; }
html[data-view="plain"] .footer { border-top: 1px solid #ccc; color: #444; }
html[data-view="plain"] .footer code { background: #f0f0f0; color: #000; }

/* ============================================================
   EASTER EGG — 90s mode.  html[data-era="90s"]
   Pure-HTML aesthetic: tiled background, Times New Roman, beveled
   borders, blue underlined links, marquee, hit counter. No fancy
   CSS, no gradients, no web fonts — like it's 1996.
   ============================================================ */
.retro-only { display: none; }

html[data-era="90s"] { scroll-behavior: auto; }

html[data-era="90s"] body {
  /* classic light tiled background, rendered purely in CSS */
  background-color: #c0c0c0;
  background-image:
    repeating-conic-gradient(#ffffff 0% 25%, #eaeaea 0% 50%);
  background-size: 22px 22px;
  color: #000080;
  font-family: "Times New Roman", Times, Georgia, serif;
  font-size: 16px;
  line-height: 1.4;
}

html[data-era="90s"] .bg-orbs { display: none !important; }
html[data-era="90s"] .retro-only { display: block; text-align: center; }

/* kill all the modern flourishes */
html[data-era="90s"] .card,
html[data-era="90s"] .controls,
html[data-era="90s"] .kicker,
html[data-era="90s"] .lang-pill,
html[data-era="90s"] .tag,
html[data-era="90s"] .search,
html[data-era="90s"] .segmented,
html[data-era="90s"] .era-toggle,
html[data-era="90s"] .view-toggle,
html[data-era="90s"] .copy-btn,
html[data-era="90s"] .theme-toggle,
html[data-era="90s"] .hero-links a,
html[data-era="90s"] .filter-pill {
  border-radius: 0 !important;
  box-shadow: none !important;
  backdrop-filter: none !important;
  background-image: none !important;
}

html[data-era="90s"] .hero, html[data-era="90s"] .main, html[data-era="90s"] .footer { max-width: 760px; }

html[data-era="90s"] .hero h1 {
  -webkit-text-fill-color: initial;
  background: none;
  color: #000080;
  font-family: "Times New Roman", Times, serif;
  text-align: center;
  text-shadow: 2px 2px #c0c0c0;
}
html[data-era="90s"] .tagline,
html[data-era="90s"] .blurb { text-align: center; color: #000080; font-family: inherit; }
html[data-era="90s"] .hero-top { justify-content: center; }
html[data-era="90s"] .kicker { color: #800080; background: none; border: none; }

/* links: blue, underlined, visited purple — the 90s holy trinity */
html[data-era="90s"] a { color: #0000ee; text-decoration: underline; }
html[data-era="90s"] a:visited { color: #551a8b; }
html[data-era="90s"] .repo-link, html[data-era="90s"] .docs-link, html[data-era="90s"] .footer-links a { color: #0000ee; text-decoration: underline; }

/* beveled "Windows 95" controls */
html[data-era="90s"] .era-toggle,
html[data-era="90s"] .view-toggle,
html[data-era="90s"] .copy-btn,
html[data-era="90s"] .theme-toggle,
html[data-era="90s"] .segmented button,
html[data-era="90s"] .hero-links a {
  background: #c0c0c0 !important;
  color: #000 !important;
  border: 2px outset #ffffff !important;
  font-family: "Times New Roman", Times, serif;
  padding: 2px 10px;
}
html[data-era="90s"] .segmented { background: transparent; border: none; padding: 0; gap: 6px; }
html[data-era="90s"] .segmented button[aria-selected="true"] { border-style: inset !important; font-weight: bold; }
html[data-era="90s"] .search { border: 2px inset #808080 !important; background: #fff !important; color: #000 !important; font-family: inherit; }
html[data-era="90s"] .controls { position: static; background: transparent; border: none; }
html[data-era="90s"] .control-label { color: #800080; }

/* spotlight band drops to a plain stacked layout in 90s mode; each panel keeps its own bevel */
html[data-era="90s"] .spotlight { grid-template-columns: 1fr; gap: 14px; }
html[data-era="90s"] .featured-section,
html[data-era="90s"] .latest-section {
  background: transparent !important; border: 2px groove #808080 !important;
  border-radius: 0 !important; padding: 10px 12px;
}
html[data-era="90s"] .new-badge {
  background: #000080 !important; color: #fff !important; border-radius: 0; border: 1px outset #fff;
}
html[data-era="90s"] .card.is-latest { border: 2px ridge #808080 !important; }

/* cards become bordered table-like boxes */
html[data-era="90s"] .card-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
html[data-era="90s"] .card {
  background: #ffffff !important;
  border: 2px ridge #808080 !important;
  color: #000 !important;
  padding: 10px 12px;
}
html[data-era="90s"] .card::before { display: none; }
html[data-era="90s"] .card h3, html[data-era="90s"] .card h3 a { color: #0000ee; font-family: "Times New Roman", Times, serif; }
html[data-era="90s"] .card-desc { color: #000; }
html[data-era="90s"] .lang-pill { background: #ffffcc !important; border: 1px solid #808080 !important; color: #000 !important; }
html[data-era="90s"] .lang-dot { display: none; }
html[data-era="90s"] .tag { background: #ffffe0 !important; border: 1px solid #999 !important; color: #000 !important; }
html[data-era="90s"] .tag.kw { color: #0000ee !important; }
html[data-era="90s"] .tag.kw.active { background: #000080 !important; color: #fff !important; }
html[data-era="90s"] .section-head h2 { font-family: "Times New Roman", Times, serif; color: #800000; }
html[data-era="90s"] .group-bar { display: none; }
html[data-era="90s"] .section-count { background: #c0c0c0; border: 1px outset #fff; color: #000; }
html[data-era="90s"] .group { border-top: 2px groove #808080; padding-top: 10px; }

/* retro chrome */
html[data-era="90s"] #retro-top marquee {
  display: block; background: #000080; color: #ffff00;
  font-weight: bold; padding: 4px; border: 2px ridge #808080;
}
html[data-era="90s"] .retro-construction { color: #ff0000; font-weight: bold; }
html[data-era="90s"] .counter {
  font-family: "Courier New", monospace; background: #000; color: #00ff00;
  padding: 1px 6px; border: 1px solid #00ff00; letter-spacing: 2px;
}
html[data-era="90s"] .footer { border-top: 2px groove #808080; color: #000080; }
html[data-era="90s"] .stats dd { color: #800000; font-family: "Times New Roman", Times, serif; }
html[data-era="90s"] .stats dt { color: #000080; }

@media (prefers-reduced-motion: no-preference) {
  html[data-era="90s"] .blink { animation: blink 1s step-start infinite; }
  @keyframes blink { 50% { opacity: 0; } }
}

@media (max-width: 600px) {
  html[data-era="90s"] .card-grid { grid-template-columns: 1fr; }
}