/* ============================================================
   PVZ Design System — Phase 1
   Global CSS variables, component styles, and utility classes.
   ============================================================ */

/* ── Fonts ── */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=Inter:wght@400;500;600;700&display=swap');

/* ── CSS Variables ── */
:root {
  /* Primary accent */
  --ds-accent: #2563eb;
  --ds-accent-hover: #1e40af;
  --ds-accent-light: #3b82f6;
  --ds-accent-surface: #eff6ff;
  --ds-accent-glow: rgba(37,99,235,0.15);

  /* Semantic colors */
  --ds-success: #15803d;
  --ds-success-surface: #f0fdf4;
  --ds-danger: #dc2626;
  --ds-danger-surface: #fef2f2;
  --ds-warning: #d97706;
  --ds-warning-surface: #fffbeb;
  --ds-info: #6366f1;
  --ds-info-surface: #eef2ff;

  /* Neutral palette */
  --ds-page-bg: #f3f2ee;
  --ds-card-bg: #ffffff;
  --ds-card-bg-hover: #fafaf9;
  --ds-border-light: #e7e5e4;
  --ds-border-medium: #d6d3d1;
  --ds-text-primary: #1c1917;
  --ds-text-secondary: #57534e;
  --ds-text-muted: #78716c;

  /* Typography scale */
  --ds-text-xs: 0.75rem;     /* 12px */
  --ds-text-sm: 0.8125rem;   /* 13px */
  --ds-text-base: 0.875rem;  /* 14px */
  --ds-text-md: 1rem;        /* 16px */
  --ds-text-lg: 1.25rem;     /* 20px */
  --ds-text-xl: 1.5rem;      /* 24px */
  --ds-text-2xl: 2rem;       /* 32px */

  /* Font families */
  --ds-sans: 'Inter', system-ui, sans-serif;
  --ds-mono: 'IBM Plex Mono', 'Consolas', monospace;

  /* Spacing scale */
  --ds-space-1: 0.25rem;   /* 4px */
  --ds-space-2: 0.5rem;    /* 8px */
  --ds-space-3: 0.75rem;   /* 12px */
  --ds-space-4: 1rem;      /* 16px */
  --ds-space-5: 1.25rem;   /* 20px */
  --ds-space-6: 1.5rem;    /* 24px */
  --ds-space-8: 2rem;      /* 32px */
  --ds-space-10: 2.5rem;   /* 40px */
  --ds-space-12: 3rem;     /* 48px */

  /* Shadow scale */
  --ds-shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --ds-shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --ds-shadow-md: 0 4px 6px rgba(0,0,0,0.05), 0 2px 4px rgba(0,0,0,0.03);
  --ds-shadow-lg: 0 10px 15px rgba(0,0,0,0.06), 0 4px 6px rgba(0,0,0,0.03);
  --ds-shadow-xl: 0 20px 25px rgba(0,0,0,0.08), 0 8px 10px rgba(0,0,0,0.04);

  /* Border radius scale */
  --ds-radius-sm: 6px;
  --ds-radius-md: 8px;
  --ds-radius-lg: 12px;
  --ds-radius-xl: 16px;
  --ds-radius-full: 9999px;
}

/* ── Buttons ── */

.btn-primary {
  background: var(--ds-accent);
  color: #fff;
  border: none;
  border-radius: var(--ds-radius-md);
  padding: 0.5rem 1rem;
  font-size: var(--ds-text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
  font-family: inherit;
  line-height: 1.4;
}
.btn-primary:hover {
  background: var(--ds-accent-hover);
  box-shadow: 0 0 0 3px var(--ds-accent-surface);
}
.btn-primary:active {
  transform: scale(0.98);
}
.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-danger {
  background: var(--ds-danger);
  color: #fff;
  border: none;
  border-radius: var(--ds-radius-md);
  padding: 0.5rem 1rem;
  font-size: var(--ds-text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
  font-family: inherit;
  line-height: 1.4;
}
.btn-danger:hover {
  background: #b91c1c;
  box-shadow: 0 0 0 3px var(--ds-danger-surface);
}
.btn-danger:active {
  transform: scale(0.98);
}
.btn-danger:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-ghost {
  background: transparent;
  color: var(--ds-text-secondary);
  border: 1px solid var(--ds-border-light);
  border-radius: var(--ds-radius-md);
  padding: 0.5rem 1rem;
  font-size: var(--ds-text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
  line-height: 1.4;
}
.btn-ghost:hover {
  background: var(--ds-card-bg-hover);
  border-color: var(--ds-border-medium);
  color: var(--ds-text-primary);
}
.btn-ghost:active {
  transform: scale(0.98);
}
.btn-ghost:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ── Data Tables ── */

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--ds-text-base);
}
.data-table thead th {
  background: #fafaf9;
  font-size: var(--ds-text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ds-text-muted);
  padding: 0.6rem 0.75rem;
  border-bottom: 2px solid var(--ds-border-light);
  text-align: left;
  position: sticky;
  top: 0;
  z-index: 2;
}
.data-table tbody td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--ds-border-light);
  color: var(--ds-text-primary);
  vertical-align: middle;
}
.data-table tbody tr:hover {
  background: var(--ds-accent-surface);
}
.data-table td.num,
.data-table th.num {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-family: var(--ds-mono);
}

/* ── Modals ── */

.ds-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: ds-fadeIn 0.15s;
}
.ds-modal-content {
  background: var(--ds-card-bg);
  border-radius: var(--ds-radius-lg);
  box-shadow: var(--ds-shadow-xl);
  width: min(560px, 92vw);
  max-height: 85vh;
  overflow-y: auto;
  padding: var(--ds-space-6);
  animation: ds-slideUp 0.2s ease-out;
}
.ds-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--ds-space-4);
}
.ds-modal-title {
  font-size: var(--ds-text-lg);
  font-weight: 700;
  color: var(--ds-text-primary);
  margin: 0;
}
.ds-modal-close {
  background: none;
  border: none;
  font-size: 1.25rem;
  color: var(--ds-text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--ds-radius-sm);
  line-height: 1;
}
.ds-modal-close:hover {
  background: var(--ds-card-bg-hover);
  color: var(--ds-text-primary);
}
.ds-modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--ds-space-3);
  margin-top: var(--ds-space-5);
}

@keyframes ds-fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes ds-slideUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Skeleton Loader ── */

.ds-skeleton {
  background: linear-gradient(
    90deg,
    var(--ds-border-light) 25%,
    #e7e5e4 50%,
    var(--ds-border-light) 75%
  );
  background-size: 200% 100%;
  animation: ds-shimmer 1.5s infinite;
  border-radius: var(--ds-radius-sm);
}
.ds-skeleton-text {
  height: 0.875rem;
  margin-bottom: 0.5rem;
  border-radius: var(--ds-radius-sm);
}
.ds-skeleton-text:last-child {
  width: 60%;
}
.ds-skeleton-card {
  height: 120px;
  border-radius: var(--ds-radius-lg);
}

@keyframes ds-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ── Tabs ── */

.ds-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--ds-border-light);
  margin-bottom: var(--ds-space-6);
}
.ds-tab {
  padding: var(--ds-space-3) var(--ds-space-5);
  font-size: var(--ds-text-sm);
  font-weight: 500;
  color: var(--ds-text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.15s;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
  font-family: inherit;
}
.ds-tab:hover {
  color: var(--ds-text-primary);
}
.ds-tab.active {
  color: var(--ds-accent);
  border-bottom-color: var(--ds-accent);
  font-weight: 600;
}

/* ── Toolbar ── */

.ds-toolbar {
  display: flex;
  align-items: center;
  gap: var(--ds-space-3);
  flex-wrap: wrap;
  margin-bottom: var(--ds-space-5);
  padding: var(--ds-space-3) var(--ds-space-4);
  background: var(--ds-card-bg);
  border: 1px solid var(--ds-border-light);
  border-radius: var(--ds-radius-md);
}
.ds-toolbar select,
.ds-toolbar input {
  font-size: var(--ds-text-sm);
  padding: 0.35rem 0.6rem;
}

/* ── Panel ── */

.ds-panel {
  background: var(--ds-card-bg);
  border: 1px solid var(--ds-border-light);
  border-radius: var(--ds-radius-lg);
  box-shadow: var(--ds-shadow-sm);
  padding: var(--ds-space-6);
}
.ds-panel:hover {
  box-shadow: var(--ds-shadow-md);
  border-color: var(--ds-border-medium);
}

/* ── Content Area ── */

.ds-content-area {
  padding: var(--ds-space-8);
  max-width: 1400px;
  margin-inline: auto;
}
@media (max-width: 768px) {
  .ds-content-area {
    padding: var(--ds-space-4);
  }
}

/* ── Form Inputs (design system variants) ── */

.ds-input,
.ds-select,
.ds-textarea {
  font-family: inherit;
  font-size: var(--ds-text-base);
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--ds-border-light);
  border-radius: var(--ds-radius-sm);
  background: var(--ds-card-bg);
  color: var(--ds-text-primary);
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
  width: 100%;
}
.ds-input:focus,
.ds-select:focus,
.ds-textarea:focus {
  border-color: var(--ds-accent);
  box-shadow: 0 0 0 3px var(--ds-accent-surface);
}
.ds-input::placeholder,
.ds-textarea::placeholder {
  color: var(--ds-text-muted);
}

/* ── Badges ── */

.ds-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: var(--ds-radius-full);
  font-size: var(--ds-text-xs);
  font-weight: 600;
  line-height: 1.5;
}
.ds-badge-info {
  background: var(--ds-info-surface);
  color: var(--ds-info);
}
.ds-badge-success {
  background: var(--ds-success-surface);
  color: var(--ds-success);
}
.ds-badge-warning {
  background: var(--ds-warning-surface);
  color: var(--ds-warning);
}
.ds-badge-danger {
  background: var(--ds-danger-surface);
  color: var(--ds-danger);
}

/* ── Status Dot ── */

.ds-status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}
.ds-status-dot-success { background: var(--ds-success); }
.ds-status-dot-warning { background: var(--ds-warning); }
.ds-status-dot-danger { background: var(--ds-danger); }
.ds-status-dot-info { background: var(--ds-info); }
.ds-status-dot-muted { background: var(--ds-text-muted); }

/* ── Toast (design system variant) ── */

.ds-toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1100;
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
  pointer-events: none;
  max-width: 380px;
}
.ds-toast {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: var(--ds-space-3) var(--ds-space-4);
  border-radius: var(--ds-radius-lg);
  border: 1px solid;
  background: var(--ds-card-bg);
  box-shadow: var(--ds-shadow-lg);
  font-size: var(--ds-text-sm);
  font-weight: 600;
  pointer-events: all;
  animation: ds-slideUp 0.26s cubic-bezier(0.34,1.4,0.64,1) forwards;
  line-height: 1.4;
}
.ds-toast.ds-toast-out {
  animation: ds-toastOut 0.2s ease forwards;
}
.ds-toast-success {
  border-color: #a7ddb6;
  color: var(--ds-success);
}
.ds-toast-danger {
  border-color: #fecdd3;
  color: var(--ds-danger);
}
.ds-toast-warning {
  border-color: #f6cd7a;
  color: var(--ds-warning);
}
.ds-toast-info {
  border-color: #c7d2fe;
  color: var(--ds-info);
}

@keyframes ds-toastOut {
  to {
    opacity: 0;
    transform: translateX(100%);
  }
}

/* ── Utility classes ── */

.ds-flex { display: flex; }
.ds-flex-col { flex-direction: column; }
.ds-items-center { align-items: center; }
.ds-justify-between { justify-content: space-between; }
.ds-gap-2 { gap: var(--ds-space-2); }
.ds-gap-3 { gap: var(--ds-space-3); }
.ds-gap-4 { gap: var(--ds-space-4); }
.ds-mt-4 { margin-top: var(--ds-space-4); }
.ds-mb-4 { margin-bottom: var(--ds-space-4); }
.ds-text-muted { color: var(--ds-text-muted); }
.ds-text-sm { font-size: var(--ds-text-sm); }
.ds-font-mono { font-family: var(--ds-mono); font-variant-numeric: tabular-nums; }
.ds-truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }