/*
  Mr. D's Chemistry Games — shared styles
  Used by the home page and every game page.
  Colours live in the :root block below; change them there and the whole site follows.
*/

:root {
  color-scheme: dark;

  /* Surfaces */
  --bg: #08090b;
  --bg-raised: #111418;
  --glass: rgba(255, 255, 255, 0.045);
  --glass-strong: rgba(255, 255, 255, 0.075);
  --line: rgba(255, 255, 255, 0.11);
  --line-strong: rgba(255, 255, 255, 0.2);

  /* Text */
  --text: #f7f6f3;
  --muted: #aeb3bb;
  --on-accent: #06080a;

  /* Chemistry accents */
  --teal: #2dd4bf;
  --teal-soft: rgba(45, 212, 191, 0.14);
  --amber: #fbbf24;
  --amber-soft: rgba(251, 191, 36, 0.14);
  --violet: #a78bfa;
  --violet-soft: rgba(167, 139, 250, 0.16);

  /* Feedback */
  --good: #34d399;
  --good-soft: rgba(52, 211, 153, 0.16);
  --bad: #fb7185;
  --bad-soft: rgba(251, 113, 133, 0.16);
  --focus: #fde68a;

  /* Shape and type */
  --radius: 16px;
  --radius-sm: 10px;
  --gutter: 16px;
  --maxw: 1080px;
  --serif: Georgia, "Times New Roman", Times, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

[hidden] {
  display: none !important;
}

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

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100svh; /* phones/iPads: the height with the browser toolbar showing, so short pages don't scroll */
  display: flex;
  flex-direction: column;
  background-color: var(--bg);
  background-image:
    radial-gradient(60rem 32rem at 90% -12rem, rgba(167, 139, 250, 0.10), transparent 70%),
    radial-gradient(50rem 30rem at -10% 4rem, rgba(45, 212, 191, 0.08), transparent 70%);
  background-repeat: no-repeat;
  color: var(--text);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.55;
  overflow-wrap: break-word;
}

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--teal);
  text-underline-offset: 0.18em;
}

a:hover {
  color: #5eead4;
}

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

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

.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

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

.site-header {
  padding: 20px 0 8px;
}

.site-header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.4rem, 1.1rem + 1.6vw, 2rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text);
  text-decoration: none;
}

.brand-mark {
  flex: none;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  box-shadow: 0 0 0 1px var(--line);
}

.brand--small {
  font-size: 1rem;
  gap: 8px;
}

.brand--small .brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
}

.header-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 0.9375rem;
  color: var(--muted);
  text-decoration: none;
}

.header-link:hover {
  color: var(--text);
  text-decoration: underline;
}

/* ---------- Main + intro ---------- */

main {
  flex: 1 0 auto;
}

.intro {
  padding: 20px 0 28px;
  max-width: 40rem;
}

.eyebrow {
  margin: 0 0 6px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
}

.lead {
  font-size: 1.125rem;
  color: var(--muted);
  margin: 0;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.08s ease;
}

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

.btn-primary {
  background: var(--teal);
  color: var(--on-accent);
}

.btn-primary:hover {
  background: #5eead4;
  color: var(--on-accent);
}

.btn-ghost {
  background: var(--glass);
  border-color: var(--line-strong);
  color: var(--text);
}

.btn-ghost:hover {
  background: var(--glass-strong);
  border-color: rgba(255, 255, 255, 0.35);
  color: var(--text);
}

.btn-lg {
  min-height: 52px;
  padding: 12px 32px;
  font-size: 1.125rem;
}

.btn-sm {
  min-height: 36px;
  padding: 6px 14px;
  font-size: 0.875rem;
}

/* ---------- Glass panel (shared by cards and games) ---------- */

.panel {
  position: relative;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02) 40%, rgba(255, 255, 255, 0.015));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 18px 40px rgba(0, 0, 0, 0.35);
}

/* ---------- Game cards (home page) ---------- */

.game-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 260px), 1fr));
  gap: 16px;
}

.card {
  --accent: var(--teal);
  --accent-soft: var(--teal-soft);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  overflow: hidden;
  background:
    radial-gradient(120% 70% at 50% 125%, var(--accent-soft), transparent 70%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.015));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06), 0 14px 32px rgba(0, 0, 0, 0.3);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

/* thin "meniscus" line of colour along the top edge */
.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 20px;
  right: 20px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.7;
}

.card[data-accent="amber"] {
  --accent: var(--amber);
  --accent-soft: var(--amber-soft);
}

.card[data-accent="violet"] {
  --accent: var(--violet);
  --accent-soft: var(--violet-soft);
}

.card-icon {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--accent-soft);
  border: 1px solid var(--line-strong);
  font-size: 28px;
  line-height: 1;
}

.card-title {
  margin: 4px 0 0;
  font-size: 1.375rem;
}

.card-blurb {
  margin: 0;
  color: var(--muted);
}

.card-actions {
  margin-top: auto;
  padding-top: 8px;
}

.card .btn-play {
  background: var(--accent);
  color: var(--on-accent);
}

/* Only on devices that really hover (mouse/trackpad): phones and iPads keep
   :hover stuck on whatever was tapped last. */
@media (hover: hover) {
  .card[data-status="ready"]:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
  }

  .card .btn-play:hover {
    background: var(--text);
    color: var(--on-accent);
  }
}

/* No transform while pressed: a transform would shrink the card-sized ::after
   overlay below down to the button mid-click, so clicks on the card body would
   be lost. Show the press with a shadow instead. */
.card .btn-play:active {
  transform: none;
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.35);
}

/* make the whole card tappable, while the Play link stays the one real link */
.card .btn-play::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  border-radius: var(--radius);
}

.card[data-status="coming-soon"] .card-icon {
  filter: grayscale(0.6);
  opacity: 0.85;
}

.badge {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 6px 14px;
  border: 1px dashed var(--line-strong);
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--muted);
}

.notice {
  padding: 20px;
  color: var(--muted);
}

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

.site-footer {
  margin-top: 56px;
  border-top: 1px solid var(--line);
  padding: 20px 0 28px;
  font-size: 0.875rem;
  color: var(--muted);
}

.site-footer p {
  margin: 0;
}

kbd {
  display: inline-block;
  min-width: 1.6em;
  padding: 0 0.35em;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 5px;
  background: var(--glass);
  font-family: var(--sans);
  font-size: 0.85em;
  line-height: 1.5;
  text-align: center;
}

@media (min-width: 720px) {
  :root {
    --gutter: 24px;
  }

  .site-header {
    padding-top: 28px;
  }

  .intro {
    padding: 28px 0 36px;
  }
}

@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;
  }

  .card[data-status="ready"]:hover,
  .btn:active {
    transform: none;
  }
}