/* ============================================
   DESIGN SYSTEM - Mẹ Bầu Hải Phòng 2026
   ============================================ */

:root {
  /* Colors - Mint primary + warm accents */
  --color-primary: #00d4aa;
  --color-primary-dark: #00b894;
  --color-primary-light: #4ce0c0;
  --color-secondary: #667eea;
  --color-secondary-dark: #764ba2;

  --color-success: #4caf50;
  --color-warning: #ffa726;
  --color-danger: #ef5350;
  --color-info: #42a5f5;

  --color-bg: #0f0f23;
  --color-bg-card: #1a1a2e;
  --color-bg-hover: #16213e;
  --color-bg-light: #ffffff;
  --color-bg-grey: #f5f5f5;

  --color-text: #ffffff;
  --color-text-light: #333333;
  --color-text-muted: #888888;
  --color-border: #333333;
  --color-border-light: #e0e0e0;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', Consolas, monospace;

  --fs-xs: 12px;
  --fs-sm: 14px;
  --fs-base: 16px;
  --fs-lg: 18px;
  --fs-xl: 20px;
  --fs-2xl: 24px;
  --fs-3xl: 32px;
  --fs-4xl: 40px;

  --fw-normal: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadow */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 15px rgba(0,0,0,0.2);
  --shadow-lg: 0 8px 25px rgba(0,0,0,0.3);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.4);

  /* Z-index */
  --z-base: 1;
  --z-overlay: 100;
  --z-modal: 1000;
  --z-toast: 2000;
  --z-tooltip: 3000;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Touch target (Apple HIG) */
  --touch-target: 44px;
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes slideDown {
  from { transform: translateY(-20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

@keyframes slideRight {
  from { transform: translateX(-20px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

@keyframes confetti-fall {
  0% { transform: translateY(-100vh) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

@keyframes skeleton-loading {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ============================================
   COMPONENTS
   ============================================ */

/* --- Buttons --- */
.ds-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--touch-target);
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  user-select: none;
}

.ds-btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #1a1a2e;
}

.ds-btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 212, 170, 0.4);
}

.ds-btn-secondary {
  background: var(--color-secondary);
  color: white;
}

.ds-btn-danger {
  background: var(--color-danger);
  color: white;
}

.ds-btn-ghost {
  background: transparent;
  color: var(--color-text);
  border: 2px solid var(--color-border);
}

.ds-btn-ghost:hover:not(:disabled) {
  background: var(--color-bg-hover);
}

.ds-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.ds-btn-full { width: 100%; }
.ds-btn-sm { min-height: 32px; padding: var(--space-2) var(--space-4); font-size: var(--fs-sm); }
.ds-btn-lg { min-height: 56px; padding: var(--space-4) var(--space-8); font-size: var(--fs-lg); }

/* --- Inputs --- */
.ds-input {
  display: block;
  width: 100%;
  min-height: var(--touch-target);
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg-card);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  transition: all var(--transition-base);
}

.ds-input-light {
  background: var(--color-bg-light);
  color: var(--color-text-light);
  border-color: var(--color-border-light);
}

.ds-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(0, 212, 170, 0.1);
}

/* --- Cards --- */
.ds-card {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
}

.ds-card-light {
  background: var(--color-bg-light);
  color: var(--color-text-light);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
}

/* --- Badges --- */
.ds-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
}

.ds-badge-success { background: var(--color-primary); color: #1a1a2e; }
.ds-badge-warning { background: var(--color-warning); color: #000; }
.ds-badge-danger { background: var(--color-danger); color: white; }
.ds-badge-info { background: var(--color-info); color: white; }

/* --- Skeleton --- */
.ds-skeleton {
  background: linear-gradient(90deg,
    rgba(255,255,255,0.05) 0%,
    rgba(255,255,255,0.1) 50%,
    rgba(255,255,255,0.05) 100%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s infinite;
  border-radius: var(--radius-sm);
}

.ds-skeleton-text { height: 16px; margin-bottom: var(--space-2); }
.ds-skeleton-circle { border-radius: 50%; }

/* ============================================
   TOAST (replaces alert)
   ============================================ */

.ds-toast-container {
  position: fixed;
  top: var(--space-5);
  right: var(--space-5);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

.ds-toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 280px;
  max-width: 400px;
  padding: var(--space-4);
  background: var(--color-bg-card);
  color: var(--color-text);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: slideRight var(--transition-base) ease forwards;
}

.ds-toast-success { border-left-color: var(--color-success); }
.ds-toast-error { border-left-color: var(--color-danger); }
.ds-toast-warning { border-left-color: var(--color-warning); }
.ds-toast-info { border-left-color: var(--color-info); }

.ds-toast-icon { font-size: var(--fs-xl); flex-shrink: 0; }
.ds-toast-content { flex: 1; }
.ds-toast-title { font-weight: var(--fw-semibold); margin-bottom: 2px; }
.ds-toast-message { font-size: var(--fs-sm); color: var(--color-text-muted); }
.ds-toast-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--space-1);
  font-size: var(--fs-lg);
}

/* ============================================
   MODAL
   ============================================ */

.ds-modal-overlay {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: var(--z-modal);
  padding: var(--space-4);
  animation: fadeIn var(--transition-base) ease;
}

.ds-modal {
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 480px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: slideUp var(--transition-base) ease;
}

.ds-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.ds-modal-title { font-size: var(--fs-xl); font-weight: var(--fw-bold); }

.ds-modal-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: var(--fs-2xl);
  padding: 0;
  line-height: 1;
}

.ds-modal-body { padding: var(--space-6); overflow-y: auto; }

.ds-modal-footer {
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
}

/* ============================================
   CONFETTI
   ============================================ */

.ds-confetti-container {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  pointer-events: none;
  z-index: var(--z-tooltip);
  overflow: hidden;
}

.ds-confetti-piece {
  position: absolute;
  top: -20px;
  width: 10px;
  height: 10px;
  animation: confetti-fall 3s linear forwards;
}

/* ============================================
   UTILITIES
   ============================================ */

.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-danger { color: var(--color-danger); }

.hidden { display: none !important; }
.flex-center { display: flex; justify-content: center; align-items: center; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}