/* ---------- Base & tokens ---------- */
:root{
  --wrap: 980px;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow: 0 8px 30px rgba(0,0,0,.08);
  --shadow-sm: 0 4px 16px rgba(0,0,0,.06);

  /* Light theme */
  --bg: #ffffff;
  --text: #0f172a;        /* slate-900 */
  --muted: #475569;       /* slate-600 */
  --line: #e5e7eb;        /* gray-200 */
  --brand: #2563eb;       /* blue-600 */
  --brand-2: #7c3aed;     /* violet-600 */
  --surface: #f8fafc;     /* slate-50 */

  /* Accent for hero gradient */
  --hero-a: #e0e7ff;      /* indigo-100 */
  --hero-b: #e9d5ff;      /* purple-100 */
  --hero-c: #cffafe;      /* cyan-100 */
}

@media (prefers-color-scheme: dark){
  :root{
    --bg: #0b1020;
    --text: #e6edf3;
    --muted: #9aa5b1;
    --line: #23304a;
    --surface: #121a2e;
    --hero-a: #1e293b;
    --hero-b: #172554;
    --hero-c: #0f766e;
    --shadow: 0 10px 28px rgba(0,0,0,.35);
    --shadow-sm: 0 6px 18px rgba(0,0,0,.3);
  }
}

*{ box-sizing: border-box; }
html,body{ margin:0; padding:0; }
body{
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ---------- Layout ---------- */
.wrapper{ max-width: var(--wrap); margin: 0 auto; padding: 24px 16px 64px; }

/* ---------- Hero ---------- */
.hero{
  position: relative;
  overflow: hidden;
  background: radial-gradient(1200px 600px at -10% -10%, var(--hero-a), transparent 60%),
              radial-gradient(900px 500px at 110% 0%, var(--hero-b), transparent 60%),
              radial-gradient(800px 400px at 50% 120%, var(--hero-c), transparent 60%);
  border-bottom: 1px solid var(--line);
}
.hero-inner{ max-width: var(--wrap); margin: 0 auto; padding: 48px 16px 28px; }
.hero h1{
  margin: 0 0 6px;
  font-size: clamp(28px, 5vw, 42px);
  letter-spacing: -0.02em;
}
.hero .tagline{ margin: 0; color: var(--muted); font-size: clamp(16px, 2.3vw, 18px); }
.hero-figure{
  max-width: 680px; margin: 18px auto 6px; background: var(--bg);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 10px;
}
.hero-figure img{
  width: 100%; height: auto; display:block; border-radius: 10px;
  transform: translateY(4px); animation: fadeUp .5s ease-out both;
}

/* ---------- Accordions (details/summary) ---------- */
details.drop{
  margin: 14px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
details.drop > summary{
  list-style: none; cursor: pointer; padding: 14px 16px; margin: 0;
  font-weight: 700; color: var(--text);
  display:flex; align-items:center; gap:10px;
}
details.drop > summary::-webkit-details-marker{ display:none; }
details.drop > summary::before{
  content:"▸"; opacity:.8; transform: translateY(-1px); transition: transform .15s ease;
}
details.drop[open] > summary::before{ content:"▾"; }
details.drop > summary:hover{ background: rgba(0,0,0,.03); }
details.drop .content{ padding: 0 16px 14px 16px; }

/* ---------- Start Here grid ---------- */
.grid{
  display: grid;
  grid-template-columns: repeat( auto-fill, minmax(240px, 1fr) );
  gap: 14px;
}
.card{
  display:block; text-decoration:none; color:inherit; background: var(--surface);
  border:1px solid var(--line); border-radius: var(--radius); padding:16px;
  box-shadow: var(--shadow-sm); transition: transform .06s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover{
  transform: translateY(-2px);
  box-shadow: var(--shadow);
  border-color: rgba(124,58,237,.35);
}
.card .kicker{
  display:inline-block; font-size:12px; letter-spacing:.08em; text-transform:uppercase; color: var(--muted);
  margin-bottom:6px;
}
.card h3{ margin: 0 0 4px; font-size: 16px; }
.card p{ margin: 0; color: var(--muted); font-size: 14px; }

/* ---------- Helpers ---------- */
hr{ border:0; height:1px; background: var(--line); margin: 28px 0; }
.center{ text-align:center; }
small.muted{ color: var(--muted); }

/* ---------- Buttons (optional reuse) ---------- */
.btn{
  background:#f3f4f6; border:1px solid var(--line); color: var(--text);
  border-radius: 10px; padding: 10px 14px; text-decoration: none; display:inline-block;
  transition: background .15s, transform .02s, box-shadow .2s;
}
.btn:hover{ background:#e5e7eb; box-shadow: var(--shadow-sm); }
.btn:active{ transform: translateY(1px); }

/* ---------- Animation ---------- */
@keyframes fadeUp{
  from{ opacity:0; transform: translateY(10px); }
  to{ opacity:1; transform: translateY(0); }
}

/* ---------- Links ---------- */
a{ color: var(--brand); }
a:hover{ color: var(--brand-2); }