/* ── Reset & base ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-primary: #4f46e5;
  --color-primary-dark: #3730a3;
  --color-danger: #dc2626;
  --color-danger-dark: #b91c1c;
  --color-success-bg: #f0fdf4;
  --color-success-border: #86efac;
  --color-error-bg: #fef2f2;
  --color-error-border: #fca5a5;
  --color-text: #1f2937;
  --color-muted: #6b7280;
  --color-border: #d1d5db;
  --color-bg: #f9fafb;
  --radius: 8px;
  --max-width: 800px;
}

body {
  font-family: system-ui, -apple-system, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Header / Nav ─────────────────────────────────────────── */
header {
  background: #fff;
  border-bottom: 1px solid var(--color-border);
  padding: 0.75rem 1.5rem;
}

nav {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-right: auto;
}
.brand:hover { text-decoration: none; }

nav ul { list-style: none; display: flex; gap: 1.25rem; }
nav ul a { color: var(--color-text); font-size: 0.95rem; }
nav ul a:hover { color: var(--color-primary); text-decoration: none; }

/* ── Main ─────────────────────────────────────────────────── */
main {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 2.5rem auto;
  padding: 0 1.5rem;
}

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 4rem 1rem;
}
.hero h1 { font-size: 2.5rem; margin-bottom: 0.75rem; }
.hero p  { font-size: 1.125rem; color: var(--color-muted); margin-bottom: 2rem; }
.hero-links { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  background: var(--color-primary);
  color: #fff;
  border: 2px solid var(--color-primary);
  transition: background 0.15s, color 0.15s;
}
.btn:hover { background: var(--color-primary-dark); border-color: var(--color-primary-dark); text-decoration: none; }

.btn-outline {
  background: transparent;
  color: var(--color-primary);
}
.btn-outline:hover { background: var(--color-primary); color: #fff; }

.btn-danger {
  background: var(--color-danger);
  border-color: var(--color-danger);
}
.btn-danger:hover { background: var(--color-danger-dark); border-color: var(--color-danger-dark); }

/* ── Content pages ────────────────────────────────────────── */
.content h1 { font-size: 2rem; margin-bottom: 0.25rem; }
.last-updated { color: var(--color-muted); font-size: 0.875rem; margin-bottom: 2rem; }

.content section { margin-bottom: 2rem; }
.content h2 { font-size: 1.25rem; margin-bottom: 0.5rem; border-bottom: 1px solid var(--color-border); padding-bottom: 0.25rem; }
.content p  { margin-bottom: 0.75rem; }
.content ul { padding-left: 1.5rem; margin-bottom: 0.75rem; }
.content li { margin-bottom: 0.25rem; }

/* ── Alerts ───────────────────────────────────────────────── */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  border: 1px solid transparent;
}
.alert-success { background: var(--color-success-bg); border-color: var(--color-success-border); }
.alert-success h2 { color: #166534; margin-bottom: 0.5rem; }
.alert-error { background: var(--color-error-bg); border-color: var(--color-error-border); }
.alert-error ul { padding-left: 1.25rem; color: var(--color-danger); }

/* ── Form ─────────────────────────────────────────────────── */
form { max-width: 560px; }

.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-weight: 600; margin-bottom: 0.35rem; font-size: 0.95rem; }
.required { color: var(--color-danger); }

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.15s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.checkbox-group label { display: flex; align-items: flex-start; gap: 0.5rem; font-weight: 400; }
.checkbox-group input[type="checkbox"] { margin-top: 0.2rem; flex-shrink: 0; width: 1rem; height: 1rem; }

.note { margin-top: 1.25rem; font-size: 0.875rem; color: var(--color-muted); }

/* ── Footer ───────────────────────────────────────────────── */
footer {
  background: #fff;
  border-top: 1px solid var(--color-border);
  text-align: center;
  padding: 1.25rem 1.5rem;
  font-size: 0.875rem;
  color: var(--color-muted);
}
footer p { margin-bottom: 0.25rem; }
footer a { color: var(--color-muted); }
footer a:hover { color: var(--color-primary); }