*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: #f8fafc;
  color: #1e293b;
  min-height: 100vh;
}

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  height: 52px;
  background: #1e293b;
  color: #f1f5f9;
}
.nav-logo { font-weight: 700; font-size: 1rem; letter-spacing: 0.05em; }
.nav-right { display: flex; align-items: center; gap: 1rem; }
.nav-user { font-size: 0.85rem; color: #94a3b8; }
.nav-logout {
  background: none; border: 1px solid #475569; color: #cbd5e1;
  padding: 4px 10px; border-radius: 4px; cursor: pointer; font-size: 0.8rem;
}
.nav-logout:hover { background: #334155; }

/* Page */
.page { max-width: 960px; margin: 0 auto; padding: 2rem 1.5rem; }

/* Dashboard */
.dash-header { margin-bottom: 2rem; }
.dash-title { font-size: 1.75rem; font-weight: 700; }
.dash-sub { color: #64748b; margin-top: 0.25rem; }

.dash-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}
.tool-card {
  display: block;
  background: #fff;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.15s, border-color 0.15s;
}
.tool-card:hover { border-color: #6366f1; box-shadow: 0 4px 16px rgba(99,102,241,0.1); }
.tool-name { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.4rem; }
.tool-desc { font-size: 0.85rem; color: #64748b; }

/* Login */
.login-wrap {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; background: #f1f5f9;
}
.login-card {
  background: #fff; border: 1px solid #e2e8f0; border-radius: 12px;
  padding: 2.5rem; width: 100%; max-width: 360px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.07);
}
.login-logo {
  font-size: 1.3rem; font-weight: 700; text-align: center;
  margin-bottom: 1.75rem; color: #1e293b;
}
.login-error {
  background: #fef2f2; border: 1px solid #fecaca; color: #dc2626;
  padding: 0.6rem 0.8rem; border-radius: 6px; font-size: 0.85rem;
  margin-bottom: 1rem;
}
.form-group { margin-bottom: 1rem; }
.form-label { display: block; font-size: 0.82rem; font-weight: 500; margin-bottom: 4px; color: #374151; }
.form-input {
  width: 100%; padding: 8px 10px; border: 1px solid #d1d5db; border-radius: 6px;
  font-size: 0.95rem; outline: none; transition: border-color 0.15s;
}
.form-input:focus { border-color: #6366f1; }
.btn {
  width: 100%; padding: 9px; background: #6366f1; color: #fff;
  border: none; border-radius: 6px; font-size: 0.95rem; font-weight: 600;
  cursor: pointer; margin-top: 0.5rem; transition: background 0.15s;
}
.btn:hover { background: #4f46e5; }

/* Error */
.error-wrap { padding: 3rem; text-align: center; }
.error-title { font-size: 1.5rem; margin-bottom: 0.5rem; }
.error-id { color: #64748b; font-size: 0.9rem; margin-bottom: 1rem; }