/* ═══════════════════════════════════════════════════════
   Spendlyst — Layout System
   Page shell, sidebar, main content, responsive grid.
   ═══════════════════════════════════════════════════════ */

/* ── App shell ──────────────────────────────────────── */
.app-shell {
  display: flex;
  min-height: 100vh;
}

.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0; /* prevent flex overflow */
}

.app-content {
  flex: 1;
  padding: var(--space-8);
  max-width: var(--container-max);
  width: 100%;
  margin: 0 auto;
}

/* ── Auth layout (centered card) ────────────────────── */
.auth-layout {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--space-4);
  background:
    radial-gradient(ellipse at 20% 50%, rgba(139, 92, 246, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(196, 181, 253, 0.06) 0%, transparent 50%),
    var(--bg-base);
}

.auth-card {
  width: 100%;
  max-width: 440px;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.auth-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
}

/* ── Page header ────────────────────────────────────── */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-8);
  flex-wrap: wrap;
  gap: var(--space-4);
}

.page-title {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-heavy);
  color: var(--text-primary);
}

.page-subtitle {
  font-size: var(--fs-base);
  color: var(--text-muted);
  margin-top: var(--space-1);
}

/* ── Grid system ────────────────────────────────────── */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ── Flexbox helpers ────────────────────────────────── */
.flex        { display: flex; }
.flex-col    { flex-direction: column; }
.flex-wrap   { flex-wrap: wrap; }
.items-center{ align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center  { justify-content: center; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ── Spacing helpers ────────────────────────────────── */
.mt-2 { margin-top: var(--space-2); }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }

/* ── Card ───────────────────────────────────────────── */
.card {
  background: var(--bg-surface);
  border: 1px solid rgba(139, 92, 246, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
  transition: box-shadow var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.card-title {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
}

/* ── Stat card ──────────────────────────────────────── */
.stat-card {
  background: var(--bg-surface);
  border: 1px solid rgba(139, 92, 246, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  transition: transform var(--duration-normal) var(--ease-spring),
              box-shadow var(--duration-normal) var(--ease-out);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-lg);
  flex-shrink: 0;
}

.stat-label {
  font-size: var(--fs-sm);
  color: var(--text-muted);
  font-weight: var(--fw-medium);
}

.stat-value {
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  font-family: var(--ff-heading);
  margin-top: var(--space-1);
}

/* ── Utilities ──────────────────────────────────────── */
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── Responsive ─────────────────────────────────────── */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .app-content { padding: var(--space-4); }
  .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .page-header { flex-direction: column; align-items: flex-start; }
  .auth-card { padding: var(--space-6); }
}

@media (max-width: 480px) {
  :root {
    --fs-2xl: 1.75rem;
    --fs-3xl: 2.25rem;
  }
  .app-content { padding: var(--space-3); }
}

/* ── Chart container ───────────────────────────────── */
.chart-container {
  background: var(--bg-surface);
  border: 1px solid rgba(139, 92, 246, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
}
.chart-header { margin-bottom: var(--space-4); }
.chart-title { font-size: var(--fs-md); font-weight: var(--fw-semibold); }
.chart-canvas { position: relative; }

/* ── Skeleton loading ──────────────────────────────── */
.skeleton {
  background: linear-gradient(90deg, var(--bg-elevated) 25%, var(--bg-sunken) 50%, var(--bg-elevated) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}
.skeleton-card { height: 80px; width: 100%; }
@keyframes shimmer { 0%{background-position:200% 0}100%{background-position:-200% 0} }

/* ── Additional helpers ────────────────────────────── */
.items-center { align-items: center; }
.flex-wrap { flex-wrap: wrap; }