/* ═══════════════════════════════════════════════════════════════════
   client/src/styles/layout.css
   Premium SaaS Layout (Grid Backgrounds, Modals, & Navigation)
   ═══════════════════════════════════════════════════════════════════ */

/* ── Premium Background ───────────────────────────────────────────── */
body {
  position: relative;
  min-height: 100vh;
  z-index: 0;
  overflow-x: hidden;
}
/* Subtle mesh/gradient background effect */
body::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 600px;
  background: radial-gradient(circle at 15% 50%, rgba(37, 99, 235, 0.08), transparent 50%),
              radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.08), transparent 50%);
  z-index: -1;
  pointer-events: none;
}
[data-theme='dark'] body::before {
  background: radial-gradient(circle at 15% 50%, rgba(37, 99, 235, 0.15), transparent 50%),
              radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.15), transparent 50%);
}

/* ── Premium Floating Navigation ──────────────────────────────────── */
.nav {
  position: sticky;
  top: var(--space-4);
  z-index: var(--z-nav);
  margin: 0 auto var(--space-8);
  max-width: 1200px;
  width: calc(100% - var(--space-8));
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: var(--border-width) solid rgba(255,255,255,0.2);
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
  padding: 0 var(--space-4);
  transition: all var(--transition);
}
[data-theme='dark'] .nav {
  background: rgba(15, 23, 42, 0.85);
  border-color: rgba(255,255,255,0.05);
}

.nav-inner {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.logo, .nav-logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo-icon {
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  color: white;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 1.1rem;
  font-weight: 800;
  box-shadow: var(--shadow-primary);
}

.nav-links { display: flex; align-items: center; gap: var(--space-2); flex: 1; margin-left: var(--space-5); }
.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
}
.nav-link:hover, .nav-link.active { 
  color: var(--primary); 
  background: var(--primary-subtle);
}

.nav-actions { display: flex; align-items: center; gap: var(--space-3); }

/* Theme Toggle */
.theme-toggle {
  width: 40px; height: 40px;
  border-radius: var(--radius-full);
  background: var(--surface-subtle);
  color: var(--text-muted);
  border: none;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: all var(--transition);
}
.theme-toggle:hover { 
  background: var(--border-color); 
  color: var(--text);
  transform: translateY(-1px);
}
.theme-toggle:active {
  transform: scale(0.95);
}

/* ── Modals ───────────────────────────────────────────────────────── */
.modal-backdrop, .modal {
  position: fixed; inset: 0;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex; align-items: center; justify-content: center;
  padding: var(--space-4);
  animation: fade-in 0.25s ease;
}

.modal { display: none; }
.modal.active { display: flex; }

.modal-content, .modal > div:not(.modal-backdrop) {
  background: var(--card-bg);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-hover);
  width: 100%; max-width: 480px; max-height: 90vh;
  overflow-y: auto;
  padding: var(--space-6);
  animation: scale-up 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
}

.modal-header { padding: 0 0 var(--space-4); display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid var(--border-color); margin-bottom: var(--space-4); }
.modal-body { padding: 0; }
.modal-footer { padding: var(--space-4) 0 0; display: flex; justify-content: flex-end; gap: var(--space-3); border-top: 1px solid var(--border-color); margin-top: var(--space-4); }

.modal-close {
  width: 32px; height: 32px;
  border-radius: var(--radius-full); border: none; background: var(--surface-subtle); color: var(--text-muted);
  display: flex; align-items: center; justify-content: center; cursor: pointer;
  transition: all var(--transition);
}
.modal-close:hover { 
  background: var(--accent-red); 
  color: white;
  transform: rotate(90deg);
}

@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes scale-up { from { opacity: 0; transform: scale(0.95) translateY(20px); } to { opacity: 1; transform: scale(1) translateY(0); } }

/* ── Auth Page Centered Layout ─────────────────────────────────────── */
.auth-page {
  min-height: 100vh;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: var(--space-5);
  position: relative;
  z-index: 1;
}

.auth-card {
  width: 100%; max-width: 420px;
  background: var(--card-bg);
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-lg);
}