:root {
  --bg: #f6f7f9;
  --bg-grad: radial-gradient(circle at 15% 0%, #eef2fb 0%, #f6f7f9 45%);
  --panel: #ffffff;
  --text: #12151a;
  --text-dim: #667085;
  --border: #e6e8ec;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 1px 1px rgba(16, 24, 40, 0.03);
  --shadow-hover: 0 12px 24px -8px rgba(16, 24, 40, 0.14), 0 2px 6px rgba(16, 24, 40, 0.06);
  --mono-bg: #eef1f5;
  --radius: 18px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0c0e12;
    --bg-grad: radial-gradient(circle at 15% 0%, #161a22 0%, #0c0e12 45%);
    --panel: #161920;
    --text: #eef1f4;
    --text-dim: #8b93a1;
    --border: #262b34;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 16px 32px -10px rgba(0, 0, 0, 0.55), 0 2px 8px rgba(0, 0, 0, 0.4);
    --mono-bg: #1f242d;
  }
}

:root[data-theme="dark"] {
  --bg: #0c0e12;
  --bg-grad: radial-gradient(circle at 15% 0%, #161a22 0%, #0c0e12 45%);
  --panel: #161920;
  --text: #eef1f4;
  --text-dim: #8b93a1;
  --border: #262b34;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 16px 32px -10px rgba(0, 0, 0, 0.55), 0 2px 8px rgba(0, 0, 0, 0.4);
  --mono-bg: #1f242d;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg-grad), var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color .2s ease, color .2s ease;
}

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 72px 24px 48px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 48px;
}

.heading { flex: 1; }

.theme-toggle {
  flex-shrink: 0;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: border-color .18s ease, color .18s ease, transform .12s ease;
}

.theme-toggle:hover {
  border-color: #4d9bff;
  color: #4d9bff;
}

.theme-toggle:active { transform: scale(0.93); }

.theme-toggle svg {
  width: 20px;
  height: 20px;
}

.theme-toggle .icon-moon { display: none; }

:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: none; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: block; }
}

.mark {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 13px;
  background: linear-gradient(155deg, #4d9bff, #7c6ff6);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.3rem;
  box-shadow: 0 6px 16px -4px rgba(77, 155, 255, 0.45);
}

.heading h1 {
  font-size: 1.7rem;
  margin: 0;
  letter-spacing: -0.02em;
}

.sub {
  color: var(--text-dim);
  margin: 2px 0 0;
  font-size: 0.92rem;
}

.grid {
  flex: 1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 18px;
  align-content: start;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease,
    background-color .2s ease;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--accent-card, #4d9bff);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .25s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  border-color: color-mix(in srgb, var(--accent-card, #4d9bff) 45%, var(--border));
}

.card:hover::before {
  transform: scaleX(1);
}

.card-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--mono-bg);
  flex-shrink: 0;
}

.card-icon-img {
  width: 118%;
  height: 118%;
  margin: -9%;
  object-fit: cover;
  display: block;
}

.card-icon-svg {
  width: 24px;
  height: 24px;
  display: flex;
}

.card-icon-svg svg { width: 100%; height: 100%; }

.card-icon-mono {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--accent-card, #4d9bff);
}

.card-name {
  font-weight: 650;
  font-size: 1.06rem;
  margin-bottom: 3px;
  letter-spacing: -0.01em;
}

.card-desc {
  color: var(--text-dim);
  font-size: 0.87rem;
  line-height: 1.45;
}

.card-link {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--text-dim);
}

.card-arrow {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  opacity: 0.6;
  transition: transform .18s ease, opacity .18s ease, color .18s ease;
}

.card:hover .card-arrow {
  transform: translate(2px, -2px);
  opacity: 1;
  color: var(--accent-card, #4d9bff);
}

footer {
  margin-top: 48px;
  color: var(--text-dim);
  font-size: 0.78rem;
}

@supports not (color: color-mix(in srgb, #fff 50%, #000)) {
  .card:hover { border-color: var(--accent-card, #4d9bff); }
}