/* ═══════════════════════════════════════════════════════════
   FinanzApp — Design System
   Variables, Reset, Typography, Utilities
   ═══════════════════════════════════════════════════════════ */

/* ─── CSS Custom Properties ─── */
:root {
  /* Primary */
  --primary: #6366F1;
  --primary-light: #818CF8;
  --primary-dark: #4F46E5;
  --primary-glow: rgba(99, 102, 241, 0.3);
  --primary-surface: rgba(99, 102, 241, 0.08);

  /* Accent / Success */
  --accent: #10B981;
  --accent-light: #34D399;
  --accent-dark: #059669;
  --accent-glow: rgba(16, 185, 129, 0.3);
  --accent-surface: rgba(16, 185, 129, 0.08);

  /* Warning */
  --warning: #F59E0B;
  --warning-light: #FBBF24;
  --warning-dark: #D97706;
  --warning-surface: rgba(245, 158, 11, 0.08);

  /* Danger */
  --danger: #F43F5E;
  --danger-light: #FB7185;
  --danger-dark: #E11D48;
  --danger-surface: rgba(244, 63, 94, 0.08);

  /* Info */
  --info: #06B6D4;
  --info-light: #22D3EE;
  --info-surface: rgba(6, 182, 212, 0.08);

  /* Neutrals (Dark Theme) */
  --bg-base: #0F172A;
  --bg-elevated: #1E293B;
  --bg-card: #1E293B;
  --bg-surface: #334155;
  --bg-hover: #3B4A63;
  --bg-input: #1E293B;
  --bg-overlay: rgba(0, 0, 0, 0.6);

  /* Borders */
  --border-default: rgba(148, 163, 184, 0.12);
  --border-hover: rgba(148, 163, 184, 0.24);
  --border-focus: var(--primary);
  --border-subtle: rgba(148, 163, 184, 0.06);

  /* Text */
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-tertiary: #64748B;
  --text-disabled: #475569;
  --text-inverse: #0F172A;
  --text-on-primary: #FFFFFF;
  --text-success: #34D399;
  --text-danger: #FB7185;
  --text-warning: #FBBF24;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #6366F1 0%, #8B5CF6 100%);
  --gradient-accent: linear-gradient(135deg, #10B981 0%, #06B6D4 100%);
  --gradient-danger: linear-gradient(135deg, #F43F5E 0%, #E879F9 100%);
  --gradient-warm: linear-gradient(135deg, #F59E0B 0%, #F43F5E 100%);
  --gradient-surface: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --shadow-glow: 0 0 20px var(--primary-glow);
  --shadow-glow-accent: 0 0 20px var(--accent-glow);

  /* Glass */
  --glass-bg: rgba(30, 41, 59, 0.7);
  --glass-border: rgba(148, 163, 184, 0.1);
  --glass-blur: 16px;

  /* Spacing */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-2xl: 28px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.8125rem;   /* 13px */
  --text-base: 0.875rem;  /* 14px */
  --text-md: 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 */
  --text-5xl: 3rem;       /* 48px */

  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;

  /* Z-Index */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
  --z-tooltip: 600;

  /* Sidebar */
  --sidebar-width: 260px;
  --sidebar-collapsed: 72px;
  --header-height: 64px;

  /* Breakpoints (for reference) */
  /* Mobile: < 768px */
  /* Tablet: 768px - 1024px */
  /* Desktop: > 1024px */
  /* Wide: > 1440px */
}

/* ─── Light Theme ─── */
[data-theme="light"] {
  --bg-base: #F1F5F9;
  --bg-elevated: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-surface: #E2E8F0;
  --bg-hover: #CBD5E1;
  --bg-input: #FFFFFF;
  --bg-overlay: rgba(0, 0, 0, 0.4);

  --border-default: rgba(15, 23, 42, 0.1);
  --border-hover: rgba(15, 23, 42, 0.2);
  --border-subtle: rgba(15, 23, 42, 0.05);

  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-tertiary: #94A3B8;
  --text-disabled: #CBD5E1;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);

  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(15, 23, 42, 0.08);

  --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.8) 0%, rgba(255,255,255,0.5) 100%);
}

/* ─── CSS Reset ─── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
}

img, svg, video, canvas {
  display: block;
  max-width: 100%;
}

a {
  color: var(--primary-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary);
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

table {
  border-collapse: collapse;
  width: 100%;
}

/* ─── Scrollbar ─── */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--bg-surface);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* ─── Typography ─── */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--leading-tight);
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-md); }

.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-md { font-size: var(--text-md); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }
.text-5xl { font-size: var(--text-5xl); }

.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

.text-primary { color: var(--text-primary); }
.text-secondary { color: var(--text-secondary); }
.text-tertiary { color: var(--text-tertiary); }
.text-success { color: var(--text-success); }
.text-danger { color: var(--text-danger); }
.text-warning { color: var(--text-warning); }
.text-accent { color: var(--primary-light); }

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ─── Number Display ─── */
.num {
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum' 1;
}

.amount-positive { color: var(--accent); }
.amount-positive::before { content: '+'; }
.amount-negative { color: var(--danger); }

.currency-display {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  font-variant-numeric: tabular-nums;
}

/* ─── Selection ─── */
::selection {
  background: var(--primary);
  color: var(--text-on-primary);
}

/* ─── Focus Visible ─── */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ─── Utility Classes ─── */
.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.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); }
.flex-1 { flex: 1; }
.flex-shrink-0 { flex-shrink: 0; }

.grid { display: grid; }

.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

.relative { position: relative; }
.absolute { position: absolute; }
.sticky { position: sticky; }

.overflow-hidden { overflow: hidden; }
.overflow-auto { overflow: auto; }

.rounded-sm { border-radius: var(--radius-sm); }
.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-full { border-radius: var(--radius-full); }

.opacity-50 { opacity: 0.5; }
.opacity-70 { opacity: 0.7; }

.pointer { cursor: pointer; }
.select-none { user-select: none; }

/* Spacing utilities */
.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.px-2 { padding-left: var(--space-2); padding-right: var(--space-2); }
.px-3 { padding-left: var(--space-3); padding-right: var(--space-3); }
.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }

.py-1 { padding-top: var(--space-1); padding-bottom: var(--space-1); }
.py-2 { padding-top: var(--space-2); padding-bottom: var(--space-2); }
.py-3 { padding-top: var(--space-3); padding-bottom: var(--space-3); }
.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }

.m-0 { margin: 0; }
.mt-1 { margin-top: var(--space-1); }
.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); }
.ml-auto { margin-left: auto; }
.mr-2 { margin-right: var(--space-2); }