:root {
  --shadow-soft: 0 18px 50px -20px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 0 1px var(--line), 0 20px 60px -25px rgba(0, 0, 0, 0.7);
}

/* ===== Aurora mesh background ===== */
body {
  background-color: var(--bg);
  background-image:
    radial-gradient(at 20% 30%, color-mix(in srgb, var(--accent) 70%, transparent) 0, transparent 50%),
    radial-gradient(at 80% 20%, color-mix(in srgb, var(--accent-2) 70%, transparent) 0, transparent 50%),
    radial-gradient(at 50% 80%, color-mix(in srgb, var(--accent) 45%, var(--accent-2)) 0, transparent 50%);
  background-attachment: fixed;
  background-size: 160% 160%;
  animation: auroraDrift 28s ease-in-out infinite alternate;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.06;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

@keyframes auroraDrift {
  0% { background-position: 0% 0%, 100% 0%, 50% 100%; }
  100% { background-position: 30% 40%, 70% 30%, 40% 60%; }
}

.section, .hero { background: transparent; position: relative; }

/* ===== Header ===== */
.site-header {
  background: color-mix(in srgb, var(--panel) 78%, transparent);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--line);
}

/* ===== Hero accents ===== */
.hero-title {
  font-weight: 800;
  letter-spacing: -0.01em;
  background: linear-gradient(100deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero-sub { color: var(--prose); }

/* ===== Panels: cards / features / faq ===== */
.card, .feature, .faq-item, .article, .tab {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  background-size: 200% 200%;
  transition: transform .35s ease, box-shadow .35s ease, border-color .35s ease, background-position .8s ease;
}
.card:hover, .feature:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  box-shadow: var(--shadow-glow), 0 0 38px -12px color-mix(in srgb, var(--accent) 60%, transparent);
  background-position: 100% 100%;
}

.card { position: relative; overflow: hidden; }
.card::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0; transition: opacity .35s ease;
}
.card:hover::after { opacity: 1; }

/* ===== Feature icons ===== */
.feature .icon {
  color: var(--on-accent);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-radius: var(--radius);
  box-shadow: 0 10px 26px -10px color-mix(in srgb, var(--accent) 70%, transparent);
}

/* ===== Badges ===== */
.badge {
  background: color-mix(in srgb, var(--accent) 16%, var(--panel));
  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--line));
  color: var(--text);
  border-radius: 999px;
}

/* ===== Buttons ===== */
.btn {
  border-radius: var(--radius);
  transition: transform .25s ease, box-shadow .25s ease, filter .25s ease;
}
.btn-primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: var(--on-accent);
  border: none;
  box-shadow: 0 14px 34px -12px color-mix(in srgb, var(--accent) 75%, transparent);
}
.btn-primary:hover { transform: translateY(-2px); filter: brightness(1.07); }
.btn-ghost {
  background: color-mix(in srgb, var(--panel) 60%, transparent);
  border: 1px solid var(--line);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--text); }

/* ===== Tabs ===== */
.tab.active {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  color: var(--on-accent);
  border-color: transparent;
}

/* ===== Tiles ===== */
.tile {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-2);
  overflow: hidden;
  transition: transform .3s ease, box-shadow .3s ease, border-color .3s ease;
}
.tile:hover {
  transform: translateY(-4px) scale(1.012);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
  box-shadow: 0 18px 44px -18px color-mix(in srgb, var(--accent-2) 65%, transparent);
}
.tile .nm { color: var(--text); font-weight: 600; }
.tile .gp { color: var(--on-accent); background: linear-gradient(120deg, var(--accent), var(--accent-2)); border-radius: 999px; }
.tile.noimg {
  background:
    radial-gradient(at 30% 25%, color-mix(in srgb, var(--accent) 30%, transparent) 0, transparent 60%),
    radial-gradient(at 75% 80%, color-mix(in srgb, var(--accent-2) 30%, transparent) 0, transparent 60%),
    var(--panel);
}

/* ===== FAQ ===== */
.faq-item { box-shadow: none; }
.faq-item:hover { border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
.faq-q { color: var(--text); font-weight: 600; }
.faq-a { color: var(--prose); }

/* ===== Facts ===== */
.fact { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); }
.fact b { background: linear-gradient(120deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ===== Tables / article ===== */
.table { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.table th { background: color-mix(in srgb, var(--accent) 14%, var(--panel)); color: var(--text); }
.article h2 { color: var(--text); font-weight: 700; letter-spacing: -0.005em; }