/* Basic reset & variables */
* { box-sizing: border-box; }
:root {
  --bg: #fafafa;
  --card: #ffffff;
  --text: #111827;
  --muted: #4b5563;
  --brand: #0ea5e9;
  --brand-700: #0369a1;
  --border: #e5e7eb;
}

html, body { height: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.55;
}

/* Layout */
.container { max-width: 1100px; margin: 0 auto; padding: 0 1rem; }
.header { background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; }
.navbar { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 1rem; }
.brand { display:flex; align-items:center; gap:.5rem; font-weight: 700; text-decoration: none; color: var(--text); }
.brand img { width: 28px; height: 28px; border-radius:6px; }

/* Nav links */
.nav { display: flex; align-items: center; gap: .5rem; }
.nav a, .nav button {
  appearance: none;
  border: 0;
  background: none;
  font: inherit;
  color: var(--text);
  text-decoration: none;
  padding: .5rem .75rem;
  border-radius: .5rem;
}
.nav a:hover, .nav button:hover, .nav a:focus-visible, .nav button:focus-visible {
  background: #f3f4f6;
  outline: 2px solid transparent;
}

.active { color: var(--brand); }

/* Dropdown */
.menu-item { position: relative; }
.submenu {
  position: absolute;
  left: 0;
  top: calc(100% + .25rem);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: .75rem;
  padding: .25rem;
  min-width: 220px;
  box-shadow: 0 10px 30px rgba(0,0,0,.08);
  display: none;
}
.menu-item:focus-within .submenu,
.menu-item:hover .submenu { display: block; }

.submenu a {
  display: block;
  padding: .5rem .75rem;
  border-radius: .5rem;
  color: var(--text);
}
.submenu a:hover, .submenu a:focus-visible { background: #f3f4f6; }

/* Mobile nav */
.mobile-toggle {
  display: none;
  border: 1px solid var(--border);
  padding: .4rem .6rem;
  border-radius: .5rem;
  background:#fff;
}
@media (max-width: 800px) {
  .nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: #fff; border-bottom:1px solid var(--border); padding: .5rem; }
  .nav.open { display: grid; gap: .25rem; }
  .menu-item { position: static; }
  .submenu { position: static; display: none; border: 0; box-shadow: none; padding: 0; margin-left: 1rem; }
  .menu-item.open .submenu { display: block; }
  .mobile-toggle { display: inline-flex; align-items:center; gap:.5rem; }
}

/* Hero / cards */
.hero { padding: 4rem 0 2.5rem; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.25rem 1.5rem;
}
.grid { display: grid; gap: 1rem; }
@media (min-width: 780px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }

/* Footer */
.footer { border-top: 1px solid var(--border); color: var(--muted); padding: 2rem 0; margin-top: 3rem; }

/* Forms */
label { display: block; font-weight: 600; margin-top: .75rem; }
input, textarea, select, button {
  font: inherit;
  padding: .6rem .7rem;
  border: 1px solid var(--border);
  border-radius: .5rem;
  width: 100%;
}
textarea { min-height: 160px; resize: vertical; }
button.primary {
  background: var(--brand);
  color: white;
  border-color: transparent;
  cursor: pointer;
}
button.primary:hover { background: var(--brand-700); }
.helper { color: var(--muted); font-size: .9rem; }