/* ai-blogs.org — high-tech dark theme */

:root {
  color-scheme: dark;
  --bg: #05080f;
  --bg-soft: #0a0f1e;
  --bg-card: linear-gradient(180deg, #0c1222 0%, #080d18 100%);
  --border: #1a2438;
  --border-strong: #2a3a5a;
  --text: #e6edf7;
  --text-dim: #8b95a8;
  --text-faint: #5a6479;
  --cyan: #22d3ee;
  --cyan-glow: rgba(34, 211, 238, 0.4);
  --violet: #a78bfa;
  --violet-glow: rgba(167, 139, 250, 0.35);
  --green: #34d399;
  --amber: #fbbf24;
  --red: #f87171;
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Inter, Roboto, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --radius: 14px;
  --radius-sm: 8px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); font-family: var(--font-sans); font-size: 16px; line-height: 1.55; -webkit-font-smoothing: antialiased; }

/* mesh-gradient background */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(60% 50% at 15% 10%, rgba(167, 139, 250, 0.10), transparent 60%),
    radial-gradient(50% 40% at 85% 0%, rgba(34, 211, 238, 0.08), transparent 60%),
    radial-gradient(70% 50% at 50% 100%, rgba(34, 211, 238, 0.06), transparent 60%);
  pointer-events: none;
}
/* subtle grid */
body::after {
  content: "";
  position: fixed; inset: 0; z-index: -1;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  pointer-events: none;
}

a { color: var(--cyan); text-decoration: none; transition: color .15s; }
a:hover { color: #67e8f9; }

/* nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  background: rgba(5, 8, 15, 0.72);
  border-bottom: 1px solid var(--border);
}
.nav-wrap {
  max-width: 1180px; margin: 0 auto;
  display: flex; align-items: center; gap: 2rem;
  padding: .85rem 1.5rem;
}
.brand {
  display: flex; align-items: center; gap: .6rem;
  font-weight: 700; letter-spacing: -0.02em; color: var(--text);
  font-size: 1.05rem;
}
.brand-mark {
  width: 32px; height: 32px;
  border-radius: 7px;
  background: url('/assets/logo.png') center/cover no-repeat;
  box-shadow: 0 0 18px var(--cyan-glow);
  position: relative;
}
.nav-links { display: flex; gap: .25rem; flex: 1; }
.nav-links a {
  color: var(--text-dim); padding: .45rem .85rem; border-radius: 8px;
  font-size: .92rem; font-weight: 500;
  transition: background .15s, color .15s;
}
.nav-links a:hover { background: rgba(255,255,255,0.04); color: var(--text); }
.nav-links a.active { color: var(--text); background: rgba(34, 211, 238, 0.08); box-shadow: inset 0 0 0 1px rgba(34, 211, 238, 0.2); }
.nav-meta { display: flex; gap: 1rem; align-items: center; color: var(--text-faint); font-family: var(--font-mono); font-size: .8rem; }
.live-dot { display: inline-block; width: 7px; height: 7px; border-radius: 50%; background: var(--green); margin-right: .4em; box-shadow: 0 0 10px var(--green); animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: .4; } }

/* layout */
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 1.5rem; }
.hero { padding: 5rem 0 4rem; }
.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.2rem);
  font-weight: 700; letter-spacing: -0.035em; line-height: 1.05;
  margin: 0 0 1rem;
  background: linear-gradient(180deg, #f8fafc 0%, #94a3b8 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero h1 .accent {
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lede { font-size: 1.15rem; color: var(--text-dim); max-width: 680px; margin: 0 0 2rem; }
.hero-meta { display: flex; gap: 1.25rem; align-items: center; color: var(--text-faint); font-family: var(--font-mono); font-size: .82rem; }

/* page header (non-home) */
.page-head { padding: 4rem 0 2.5rem; }
.eyebrow { display: inline-block; font-family: var(--font-mono); font-size: .75rem; color: var(--cyan); text-transform: uppercase; letter-spacing: .15em; margin-bottom: .9rem; padding: .25rem .6rem; border: 1px solid rgba(34, 211, 238, 0.3); border-radius: 999px; background: rgba(34, 211, 238, 0.05); }
.page-head h1 { font-size: clamp(2rem, 4.5vw, 3.2rem); margin: 0 0 .75rem; letter-spacing: -0.025em; }
.page-head p { color: var(--text-dim); max-width: 640px; font-size: 1.05rem; margin: 0; }

/* section heading */
.section { padding: 2rem 0 4rem; }
.section h2 { font-size: 1.4rem; margin: 0 0 1.5rem; display: flex; align-items: baseline; gap: 1rem; letter-spacing: -0.01em; }
.section h2 .count { font-family: var(--font-mono); font-size: .82rem; color: var(--text-faint); font-weight: 500; }
.section .more { margin-left: auto; font-size: .88rem; color: var(--cyan); font-weight: 500; }

/* card grid */
.grid { display: grid; gap: 1.1rem; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.two { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 800px) { .grid.three, .grid.two { grid-template-columns: 1fr; } }

/* card */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.4rem 1.4rem 1.2rem;
  transition: border-color .2s, transform .2s, box-shadow .2s;
  position: relative;
  display: flex; flex-direction: column;
}
.card:has(h3 a) { cursor: pointer; }
.card:hover { border-color: var(--border-strong); transform: translateY(-2px); box-shadow: 0 12px 40px rgba(34, 211, 238, 0.07); }
/* stretched-link: entire card is clickable, title is still the semantic link */
.card h3 a::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: var(--radius);
}
/* keep nested interactive elements above the stretched overlay */
.card .meta a, .card .foot a { position: relative; z-index: 2; }
/* decorative .right column stays visible but lets clicks pass through to stretched link */
.card .right { pointer-events: none; }
.card .meta { display: flex; gap: .9rem; align-items: center; font-family: var(--font-mono); font-size: .75rem; color: var(--text-faint); margin-bottom: .8rem; text-transform: uppercase; letter-spacing: .08em; }
.card .meta .source { color: var(--cyan); }
.card .meta .tag { padding: 1px 7px; border-radius: 4px; background: rgba(167, 139, 250, 0.12); color: var(--violet); border: 1px solid rgba(167, 139, 250, 0.25); text-transform: none; letter-spacing: 0; font-size: .7rem; }
.card h3 { margin: 0 0 .55rem; font-size: 1.1rem; line-height: 1.3; color: var(--text); letter-spacing: -0.01em; }
.card h3 a { color: inherit; }
.card h3 a:hover { color: var(--cyan); }
.card p { margin: 0; color: var(--text-dim); font-size: .92rem; flex: 1; }
.card .foot { margin-top: 1rem; padding-top: .85rem; border-top: 1px solid var(--border); font-family: var(--font-mono); font-size: .72rem; color: var(--text-faint); display: flex; justify-content: space-between; }

/* big featured card */
.card.featured {
  grid-column: 1 / -1;
  display: grid; grid-template-columns: 1.4fr 1fr; gap: 2rem;
  padding: 2.2rem;
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.06), rgba(167, 139, 250, 0.04)), var(--bg-soft);
  border-color: rgba(34, 211, 238, 0.18);
}
.card.featured h3 { font-size: 1.7rem; line-height: 1.2; }
.card.featured p { font-size: 1rem; }
.card.featured .right { display: flex; align-items: center; justify-content: center; opacity: .4; }
.card.featured .right .glyph {
  width: 180px; height: 180px;
  border-radius: 24px;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  filter: blur(20px) saturate(120%);
}
@media (max-width: 800px) { .card.featured { grid-template-columns: 1fr; } .card.featured .right { display: none; } }

/* topics strip */
.topic-strip { display: flex; gap: .55rem; flex-wrap: wrap; }
.topic-chip {
  font-family: var(--font-mono); font-size: .78rem;
  padding: .4rem .85rem; border-radius: 999px;
  background: rgba(255,255,255,0.03); border: 1px solid var(--border);
  color: var(--text-dim); transition: all .15s;
}
.topic-chip:hover { color: var(--text); border-color: var(--cyan); background: rgba(34, 211, 238, 0.08); }

/* topics grid (topics page) */
.topics-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1.1rem; }
.topic-card {
  padding: 1.6rem 1.4rem;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all .2s;
  display: block; color: inherit;
}
.topic-card:hover { border-color: var(--cyan); transform: translateY(-2px); }
.topic-card .icon { font-family: var(--font-mono); font-size: .75rem; color: var(--cyan); margin-bottom: .8rem; letter-spacing: .1em; }
.topic-card h3 { margin: 0 0 .4rem; color: var(--text); font-size: 1.1rem; }
.topic-card p { margin: 0; color: var(--text-dim); font-size: .88rem; }
.topic-card .stat { margin-top: 1rem; font-family: var(--font-mono); font-size: .72rem; color: var(--text-faint); }

/* podcast player block */
.player {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.4rem; margin-bottom: 2rem;
  display: flex; gap: 1.4rem; align-items: center;
}
.player .cover {
  width: 96px; height: 96px; border-radius: 12px;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  flex-shrink: 0;
  box-shadow: 0 8px 24px var(--cyan-glow);
}
.player .info { flex: 1; }
.player .info .ep { font-family: var(--font-mono); font-size: .75rem; color: var(--cyan); margin-bottom: .35rem; }
.player .info h3 { margin: 0 0 .3rem; font-size: 1.15rem; }
.player .info .duration { font-family: var(--font-mono); font-size: .78rem; color: var(--text-faint); }
.player audio { width: 100%; margin-top: .85rem; }

/* empty state */
.empty {
  border: 1px dashed var(--border); border-radius: var(--radius);
  padding: 4rem 2rem; text-align: center; color: var(--text-faint);
  background: rgba(255,255,255,0.012);
}
.empty .glyph { font-size: 2rem; opacity: .4; margin-bottom: 1rem; }
.empty h3 { margin: 0 0 .5rem; color: var(--text-dim); font-weight: 500; }
.empty p { margin: 0; font-size: .9rem; }

/* article body */
.article {
  max-width: 720px; margin: 0 auto; padding: 4rem 1.5rem 6rem;
}
.article .article-meta { font-family: var(--font-mono); font-size: .82rem; color: var(--text-faint); margin-bottom: 1.5rem; display: flex; gap: 1rem; }
.article h1 { font-size: clamp(1.9rem, 4vw, 2.7rem); margin: 0 0 1rem; letter-spacing: -0.025em; line-height: 1.15; }
.article .deck { font-size: 1.2rem; color: var(--text-dim); margin: 0 0 2.5rem; line-height: 1.45; }
.article p { font-size: 1.05rem; color: #d1d8e6; margin: 0 0 1.3rem; }
.article h2 { font-size: 1.5rem; margin: 2.5rem 0 1rem; letter-spacing: -0.015em; }
.article blockquote { margin: 2rem 0; padding: 1rem 1.4rem; border-left: 3px solid var(--cyan); background: rgba(34, 211, 238, 0.04); border-radius: 0 8px 8px 0; color: var(--text-dim); font-style: italic; }
.article code { font-family: var(--font-mono); background: rgba(255,255,255,0.05); padding: 1px 6px; border-radius: 4px; font-size: .92em; color: var(--cyan); }
.article pre { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 1rem 1.2rem; overflow-x: auto; }
.article pre code { background: none; padding: 0; color: var(--text); }

/* footer */
.footer {
  margin-top: 4rem; padding: 3rem 0 2.5rem;
  border-top: 1px solid var(--border);
  color: var(--text-faint); font-size: .85rem;
}
.footer-wrap { max-width: 1180px; margin: 0 auto; padding: 0 1.5rem; display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 2rem; }
.footer .col h4 { font-family: var(--font-mono); font-size: .72rem; color: var(--text-dim); text-transform: uppercase; letter-spacing: .15em; margin: 0 0 .8rem; }
.footer .col a { display: block; color: var(--text-faint); padding: .2rem 0; }
.footer .col a:hover { color: var(--cyan); }
.footer .build { font-family: var(--font-mono); font-size: .75rem; color: var(--text-faint); }

/* utility */
.row { display: flex; gap: 1rem; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }
.muted { color: var(--text-faint); }

/* mobile nav */
.nav-toggle { display: none; background: none; border: 1px solid var(--border); color: var(--text); padding: .4rem .65rem; border-radius: 6px; font-family: var(--font-mono); cursor: pointer; }
@media (max-width: 760px) {
  .nav-links { display: none; position: absolute; top: 100%; left: 0; right: 0; flex-direction: column; background: rgba(5,8,15,.95); border-bottom: 1px solid var(--border); padding: .5rem 1rem 1rem; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .nav-meta { display: none; }
}