/* ============================================================================
   DESIGN SYSTEM v1.0 - PCM Dashboard
   
   This is your single source of truth for all design tokens (colors, spacing,
   typography, shadows, etc.). Update here, and changes cascade everywhere.
   
   Structure:
   1. Design Tokens (colors, spacing, typography)
   2. Base Resets & Global Styles
   3. Typography Utilities
   4. Component Base Styles
   5. Responsive Utilities
   
   ============================================================================ */

/* ============================================================================
   1. DESIGN TOKENS - Define everything here
   ============================================================================ */

:root {
  /* ─────────────────────────────────────────────────────────────────────── */
  /* COLOR PALETTE - Semantic naming makes changes easy */
  /* ─────────────────────────────────────────────────────────────────────── */
  
  /* Neutrals / Grayscale */
  --color-neutral-50: #fafafa;
  --color-neutral-100: #f5f5f5;
  --color-neutral-200: #e5e5e5;
  --color-neutral-300: #d4d4d4;
  --color-neutral-400: #a3a3a3;
  --color-neutral-500: #737373;
  --color-neutral-600: #525252;
  --color-neutral-700: #404040;
  --color-neutral-800: #262626;
  --color-neutral-900: #171717;

  /* Brand Colors - keep your existing identity */
  --color-brand-primary: #4b5e70; /* slate-ish, from current app */
  --color-brand-accent: #df5d4f; /* coral/rust red */
  --color-brand-light: #fefaf5; /* warm off-white background */
  --color-brand-sand: #f6efe3;  /* light sand tone */
  --color-brand-dark: #14213d;  /* dark navy */

  /* Semantic Colors */
  --color-text-primary: #1f2937; /* main text */
  --color-text-secondary: #6b7280; /* secondary text */
  --color-text-muted: #9ca3af; /* disabled/helper text */
  --color-text-inverse: #ffffff; /* text on dark backgrounds */

  --color-bg-primary: #ffffff; /* card backgrounds */
  --color-bg-secondary: #f9fafb; /* subtle backgrounds */
  --color-bg-page: #fefaf5; /* page background */
  --color-bg-overlay: rgba(17, 24, 39, 0.45); /* modal overlays */

  --color-border-light: #e5e7eb; /* subtle borders */
  --color-border-default: #d1d5db; /* standard borders */
  --color-border-strong: #9ca3af; /* prominent borders */

  --color-success: #10b981; /* green actions */
  --color-warning: #f59e0b; /* amber alerts */
  --color-danger: #ef4444; /* red destructive */
  --color-info: #3b82f6; /* blue informational */

  /* Status Badges */
  --color-badge-bg: #ede9fe;
  --color-badge-text: #5b21b6;
  --color-badge-success-bg: #d1fae5;
  --color-badge-success-text: #065f46;
  --color-badge-warning-bg: #fef3c7;
  --color-badge-warning-text: #92400e;
  --color-badge-danger-bg: #fee2e2;
  --color-badge-danger-text: #991b1b;

  /* ─────────────────────────────────────────────────────────────────────── */
  /* SPACING SCALE - 8px base unit (common standard) */
  /* ─────────────────────────────────────────────────────────────────────── */
  --sp-0: 0;
  --sp-1: 0.25rem;  /* 4px */
  --sp-2: 0.5rem;   /* 8px */
  --sp-3: 0.75rem;  /* 12px */
  --sp-4: 1rem;     /* 16px - Base unit */
  --sp-5: 1.25rem;  /* 20px */
  --sp-6: 1.5rem;   /* 24px */
  --sp-8: 2rem;     /* 32px */
  --sp-10: 2.5rem;  /* 40px */
  --sp-12: 3rem;    /* 48px */
  --sp-16: 4rem;    /* 64px */

  /* ─────────────────────────────────────────────────────────────────────── */
  /* TYPOGRAPHY SCALE */
  /* ─────────────────────────────────────────────────────────────────────── */
  
  /* Font Families */
  --font-sans: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Monaco', 'Menlo', monospace;

  /* Font Sizes - using rem (scales with root font-size) */
  --text-xs: 0.75rem;    /* 12px */
  --text-sm: 0.875rem;   /* 14px */
  --text-base: 1rem;     /* 16px */
  --text-lg: 1.125rem;   /* 18px */
  --text-xl: 1.25rem;    /* 20px */
  --text-2xl: 1.5rem;    /* 24px */
  --text-3xl: 1.875rem;  /* 30px */
  --text-4xl: 2.25rem;   /* 36px */

  /* Line Heights */
  --line-tight: 1.25;
  --line-normal: 1.5;
  --line-relaxed: 1.75;

  /* Letter Spacing */
  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.05em;

  /* Font Weights */
  --weight-light: 300;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --weight-extrabold: 800;

  /* ─────────────────────────────────────────────────────────────────────── */
  /* SHADOWS (Elevation System) */
  /* ─────────────────────────────────────────────────────────────────────── */
  --shadow-none: none;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-base: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1), 0 2px 4px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1), 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.15);

  /* ─────────────────────────────────────────────────────────────────────── */
  /* BORDER RADIUS */
  /* ─────────────────────────────────────────────────────────────────────── */
  --radius-none: 0;
  --radius-sm: 0.375rem;   /* 6px */
  --radius-base: 0.5rem;   /* 8px */
  --radius-md: 0.75rem;    /* 12px */
  --radius-lg: 1rem;       /* 16px */
  --radius-xl: 1.25rem;    /* 20px */
  --radius-2xl: 1.5rem;    /* 24px */
  --radius-full: 999px;    /* Pill shape */

  /* ─────────────────────────────────────────────────────────────────────── */
  /* TRANSITIONS & ANIMATIONS */
  /* ─────────────────────────────────────────────────────────────────────── */
  --trans-fast: 150ms ease;
  --trans-base: 200ms ease;
  --trans-slow: 300ms ease;

  /* ─────────────────────────────────────────────────────────────────────── */
  /* LAYOUT TOKENS */
  /* ─────────────────────────────────────────────────────────────────────── */
  --sidebar-width: 220px;
  --sidebar-space: var(--sidebar-width);
  --content-max-width: 1200px;
  --content-gap: 20px;

  /* ─────────────────────────────────────────────────────────────────────── */
  /* BREAKPOINTS (mobile-first) */
  /* ─────────────────────────────────────────────────────────────────────── */
  /* Used with @media (min-width: var(--breakpoint-md)) */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;
}

/* ============================================================================
   2. BASE RESETS & GLOBAL STYLES
   ============================================================================ */

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

html {
  font-size: 16px; /* Base for rem calculations */
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--line-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-page);
  margin: 0;
  padding: 0;
  height: 100%;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ============================================================================
   3. TYPOGRAPHY UTILITIES
   ============================================================================ */

h1,
.h1 {
  font-size: var(--text-4xl);
  font-weight: var(--weight-bold);
  line-height: var(--line-tight);
  letter-spacing: var(--tracking-tight);
}

h2,
.h2 {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  line-height: var(--line-tight);
}

h3,
.h3 {
  font-size: var(--text-2xl);
  font-weight: var(--weight-semibold);
  line-height: var(--line-tight);
}

h4,
.h4 {
  font-size: var(--text-xl);
  font-weight: var(--weight-semibold);
  line-height: var(--line-normal);
}

h5,
.h5 {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  line-height: var(--line-normal);
}

h6,
.h6 {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  line-height: var(--line-normal);
}

p {
  margin-bottom: var(--sp-4);
}

p:last-child {
  margin-bottom: 0;
}

small,
.text-sm {
  font-size: var(--text-sm);
}

.text-xs {
  font-size: var(--text-xs);
}

.text-muted {
  color: var(--color-text-secondary);
}

.text-muted-strong {
  color: var(--color-text-muted);
}

/* ============================================================================
   4. COMPONENT BASE STYLES
   ============================================================================ */

/* ──── BUTTONS ──── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0.6rem 1.2rem;
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    background-color var(--trans-fast),
    color var(--trans-fast),
    box-shadow var(--trans-fast),
    transform var(--trans-fast);
  white-space: nowrap;
  user-select: none;
  text-decoration: none;
  line-height: 1.2;
  min-width: 44px; /* Touch target minimum */
  min-height: 44px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Button variants */
.btn--primary {
  background-color: var(--color-brand-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover:not(:disabled) {
  background-color: #3d4f5f;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn--secondary {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border-default);
}

.btn--secondary:hover:not(:disabled) {
  background-color: var(--color-bg-page);
  border-color: var(--color-border-strong);
}

.btn--danger {
  background-color: var(--color-danger);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn--danger:hover:not(:disabled) {
  background-color: #dc2626;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--success {
  background-color: var(--color-success);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn--success:hover:not(:disabled) {
  background-color: #059669;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-brand-primary);
  border: 1px solid transparent;
}

.btn--ghost:hover:not(:disabled) {
  background-color: var(--color-bg-secondary);
  border-color: var(--color-brand-primary);
}

.btn--small {
  padding: 0.4rem 0.8rem;
  font-size: var(--text-xs);
  min-width: 36px;
  min-height: 36px;
}

.btn--large {
  padding: 0.8rem 1.6rem;
  font-size: var(--text-base);
  min-width: 48px;
  min-height: 48px;
}

.btn--full {
  width: 100%;
}

/* ──── CARDS ──── */

.card {
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--sp-6);
  box-shadow: var(--shadow-sm);
  transition:
    transform var(--trans-base),
    box-shadow var(--trans-base);
}

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

.card--interactive {
  cursor: pointer;
}

.card--flat {
  box-shadow: none;
  border: 1px solid var(--color-border-light);
}

.card--elevated {
  box-shadow: var(--shadow-lg);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--sp-2);
}

.card-body {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
}

/* ──── FORMS ──── */

.form-group {
  margin-bottom: var(--sp-6);
  display: flex;
  flex-direction: column;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-group--inline {
  flex-direction: row;
  align-items: center;
  gap: var(--sp-4);
}

.form-group__label {
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--sp-2);
  color: var(--color-text-primary);
}

.form-group--inline .form-group__label {
  margin-bottom: 0;
  white-space: nowrap;
}

.form-group__input,
.form-group__select,
.form-group__textarea {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  transition:
    border-color var(--trans-fast),
    box-shadow var(--trans-fast),
    background-color var(--trans-fast);
}

.form-group__input:focus,
.form-group__select:focus,
.form-group__textarea:focus {
  outline: none;
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 0 3px rgba(75, 94, 112, 0.1);
}

.form-group__input:disabled,
.form-group__select:disabled,
.form-group__textarea:disabled {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-muted);
  cursor: not-allowed;
}

.form-group__textarea {
  resize: vertical;
  min-height: 120px;
}

.form-group__helper {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  margin-top: var(--sp-2);
}

.form-group__error {
  font-size: var(--text-xs);
  color: var(--color-danger);
  margin-top: var(--sp-2);
}

/* ──── BADGES ──── */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-1);
  padding: 0.375rem 0.75rem;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  border-radius: var(--radius-full);
  background-color: var(--color-badge-bg);
  color: var(--color-badge-text);
  white-space: nowrap;
}

.badge--success {
  background-color: var(--color-badge-success-bg);
  color: var(--color-badge-success-text);
}

.badge--warning {
  background-color: var(--color-badge-warning-bg);
  color: var(--color-badge-warning-text);
}

.badge--danger {
  background-color: var(--color-badge-danger-bg);
  color: var(--color-badge-danger-text);
}

/* ──── ALERTS ──── */

.alert {
  padding: var(--sp-4);
  border-radius: var(--radius-md);
  border-left: 4px solid;
  display: flex;
  gap: var(--sp-3);
  align-items: flex-start;
}

.alert--info {
  background-color: #eff6ff;
  border-color: var(--color-info);
  color: #1e40af;
}

.alert--success {
  background-color: #f0fdf4;
  border-color: var(--color-success);
  color: #15803d;
}

.alert--warning {
  background-color: #fffbeb;
  border-color: var(--color-warning);
  color: #92400e;
}

.alert--danger {
  background-color: #fef2f2;
  border-color: var(--color-danger);
  color: #991b1b;
}

/* ──── TABLES ──── */

.table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.table thead {
  background-color: var(--color-neutral-50);
}

.table th {
  padding: var(--sp-3);
  text-align: left;
  font-weight: var(--weight-semibold);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  border-bottom: 1px solid var(--color-border-light);
}

.table td {
  padding: var(--sp-3);
  border-bottom: 1px solid var(--color-border-light);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.table tbody tr:hover {
  background-color: var(--color-bg-secondary);
}

.table tbody tr:last-child td {
  border-bottom: none;
}

/* ──── MODALS ──── */

.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: var(--color-bg-overlay);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(2px);
}

.modal-overlay.is-open {
  display: flex;
}

.modal {
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  padding: var(--sp-8);
  max-width: 90vw;
  max-height: 90vh;
  overflow-y: auto;
  animation: modal-in 200ms ease;
}

@keyframes modal-in {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-header {
  margin-bottom: var(--sp-6);
}

.modal-title {
  font-size: var(--text-2xl);
  font-weight: var(--weight-bold);
  margin: 0;
}

.modal-body {
  margin-bottom: var(--sp-6);
}

.modal-footer {
  display: flex;
  gap: var(--sp-3);
  justify-content: flex-end;
}

/* ============================================================================
   5. RESPONSIVE UTILITIES
   ============================================================================ */

.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

/* Mobile-first: these show by default, hide on larger screens */
.mobile-only {
  display: block;
}

@media (min-width: var(--breakpoint-md)) {
  .mobile-only {
    display: none;
  }
}

@media (max-width: calc(var(--breakpoint-md) - 1px)) {
  .desktop-only {
    display: none;
  }
}

/* Responsive spacing */
@media (max-width: calc(var(--breakpoint-md) - 1px)) {
  .sp-responsive-down {
    padding: var(--sp-4) !important;
  }
}

@media (min-width: var(--breakpoint-md)) {
  .sp-responsive-up {
    padding: var(--sp-6) !important;
  }
}

/* ============================================================================
   6. UTILITY CLASSES (used for Quick adjustments)
   ============================================================================ */

.flex {
  display: flex;
}

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

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

.grid {
  display: grid;
}

.gap-sm {
  gap: var(--sp-2);
}

.gap-md {
  gap: var(--sp-4);
}

.gap-lg {
  gap: var(--sp-6);
}

.p-0 {
  padding: 0;
}
.p-sm {
  padding: var(--sp-2);
}
.p-md {
  padding: var(--sp-4);
}
.p-lg {
  padding: var(--sp-6);
}

.m-0 {
  margin: 0;
}
.m-sm {
  margin: var(--sp-2);
}
.m-md {
  margin: var(--sp-4);
}
.m-lg {
  margin: var(--sp-6);
}

.rounded {
  border-radius: var(--radius-md);
}

.rounded-lg {
  border-radius: var(--radius-lg);
}

.shadow {
  box-shadow: var(--shadow-base);
}

.shadow-lg {
  box-shadow: var(--shadow-lg);
}