/**
 * templates/saas-template/frontend/css/layout.css
 * Layout, Flexbox/Grid containers, and Mobile Viewport rules.
 */

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

html, body {
  width: 100%;
  max-width: 100vw;
  box-sizing: border-box;
  overflow-x: hidden;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-family);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* Header */
.saas-header {
  height: var(--header-height);
  background: var(--bg-glass);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.app-icon {
  font-size: 1.6rem;
  display: flex;
  align-items: center;
}

.brand-titles {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.brand-title {
  font-family: var(--font-title);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.brand-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(6, 182, 212, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(6, 182, 212, 0.3);
}

.header-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Container */
.saas-container {
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  flex: 1;
}

/* Hero / KPI Banner */
.kpi-banner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.kpi-card {
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.kpi-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
}

.kpi-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.kpi-value {
  font-family: var(--font-title);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-main);
}

.kpi-value.highlight {
  color: var(--accent-cyan);
}

.kpi-value.healthy {
  color: var(--accent-emerald);
}

/* Toolbar */
.toolbar-section {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.search-box {
  display: flex;
  gap: 0.5rem;
  flex: 1;
  max-width: 400px;
}

.filter-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Items View Section & Flexbox Shrink Defense */
.items-view-section {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 300px;
}

.items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
  width: 100%;
}

/* 방어 코드: 항목 압축 버그(flex-shrink) 원천 방지 */
.item-card {
  flex-shrink: 0;
  min-height: fit-content;
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 1rem;
  text-align: center;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-lg);
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

/* Responsive Breakpoints */
@media (max-width: 640px) {
  .saas-header {
    padding: 0 1rem;
  }
  .brand-title {
    font-size: 1.1rem;
  }
  .toolbar-section {
    flex-direction: column;
    align-items: stretch;
  }
  .search-box {
    max-width: 100%;
  }
  .filter-actions {
    justify-content: stretch;
  }
  .filter-actions > * {
    flex: 1;
  }
  .items-grid {
    grid-template-columns: 1fr;
  }
}