/* ── Variables ── */
:root {
  --bg: #ffffff;
  --bg-subtle: #f9f9f9;
  --text: #1a1a1a;
  --text-secondary: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --danger: #dc2626;
  --success: #16a34a;
  --nav-h: 56px;
  --radius: 12px;
  --radius-sm: 8px;
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-display: 'Space Grotesk', system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f0f0f;
    --bg-subtle: #1a1a1a;
    --text: #e5e5e5;
    --text-secondary: #9ca3af;
    --border: #2a2a2a;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
  }
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  min-height: 100vh;
}
img { display: block; max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }
button { cursor: pointer; font-family: inherit; }

/* ── Nav ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  backdrop-filter: blur(8px);
}
.nav-inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav-brand:hover { color: var(--text); }
.admin-badge {
  font-family: var(--font-sans);
  font-size: 0.65rem;
  font-weight: 500;
  background: var(--accent);
  color: #fff;
  padding: 2px 6px;
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.nav-links { display: flex; gap: 1.5rem; }
.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.15s;
}
.nav-link:hover, .nav-link.active { color: var(--text); }

/* ── Main ── */
.main { padding: 2rem 1.25rem 4rem; }

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid transparent;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  line-height: 1;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border-color: var(--border);
}
.btn-ghost:hover { color: var(--text); border-color: var(--text-secondary); }
.btn-danger { background: transparent; color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: var(--danger); color: #fff; }
.btn-sm { padding: 0.3rem 0.65rem; font-size: 0.8rem; }
.btn-full { width: 100%; justify-content: center; }

/* ── Flash messages ── */
.flash {
  max-width: 720px;
  margin: 0 auto 1rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
}
.flash-success { background: #dcfce7; color: #15803d; border: 1px solid #bbf7d0; }
.flash-error { background: #fee2e2; color: #b91c1c; border: 1px solid #fecaca; }
@media (prefers-color-scheme: dark) {
  .flash-success { background: #14532d; color: #86efac; border-color: #166534; }
  .flash-error { background: #7f1d1d; color: #fca5a5; border-color: #991b1b; }
}

/* ── Home page ── */
.home-container {
  max-width: 640px;
  margin: 0 auto;
  padding: 3rem 0 2rem;
}
.home-content { line-height: 1.8; }
.home-content h1, .home-content h2, .home-content h3 {
  font-family: var(--font-display);
  font-weight: 700;
  margin-bottom: 0.75rem;
  margin-top: 2rem;
}
.home-content h1 { font-size: 2rem; }
.home-content h2 { font-size: 1.5rem; }
.home-content p { margin-bottom: 1rem; }
.home-placeholder h1 { font-family: var(--font-display); font-size: 2rem; margin-bottom: 0.75rem; }
.text-secondary { color: var(--text-secondary); }

/* ── Forms ── */
.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}
.form-input {
  width: 100%;
  padding: 0.6rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: border-color 0.15s;
}
.form-input:focus { outline: none; border-color: var(--accent); }