/* ================================================================
   VoehringerSolutions — Brand Design Tokens
   Design-System: Teaching Finance Billing (1:1 Kopie)
   ================================================================

   Quelle: Design.md — Verbindliche Referenz
   Letzte Aktualisierung: 2026-04-06

   Import:
     <link rel="stylesheet" href="/css/brand-tokens.css">
     Muss VOR admin-theme.css oder sonstigen Theme-Dateien geladen werden.
   ================================================================ */


/* ================================================================
   1. GOOGLE FONTS
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');


/* ================================================================
   2. DESIGN TOKENS — LIGHT MODE (Default)
   ================================================================ */

:root {
  /* ---- Typography ---- */
  --font-heading: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  /* Font Sizes */
  --text-xs: 0.6875rem;    /* 11px */
  --text-sm: 0.8125rem;    /* 13px */
  --text-base: 0.8125rem;  /* 13px */
  --text-lg: 1rem;         /* 16px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */

  /* Line Heights */
  --leading-xs: 1rem;
  --leading-sm: 1.25rem;
  --leading-base: 1.25rem;
  --leading-lg: 1.5rem;
  --leading-tight: 1.2;
  --leading-snug: 1.35;
  --leading-normal: 1.5;
  --leading-relaxed: 1.65;

  /* Letter Spacing */
  --tracking-tight: -0.025em;
  --tracking-normal: 0em;
  --tracking-wide: 0.03em;
  --tracking-wider: 0.06em;
  --tracking-widest: 0.08em;

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


  /* ---- Backgrounds ---- */
  --color-surface: hsl(220 27% 95%);
  --color-base: hsl(220 15% 97.5%);
  --color-elevated: hsl(0 0% 100%);
  --color-hover: hsl(225 17% 93%);

  /* ---- Text ---- */
  --color-fg: hsl(240 27% 14%);
  --color-fg-hover: hsl(240 20% 22%);
  --color-muted: hsl(220 9% 46%);
  --color-dim: hsl(218 11% 65%);
  --color-on-dark: hsl(220 27% 98%);

  /* ---- Accent & Brand (Purple) ---- */
  --color-accent: hsl(252 100% 54%);
  --color-accent-light: hsl(254 100% 64%);
  --color-brand: hsl(252 97% 44%);
  --color-accent-glow: hsl(252 100% 54% / 0.08);
  --color-accent-tint: hsl(252 100% 54% / 0.03);
  --color-accent-muted: hsl(252 100% 54% / 0.15);
  --color-accent-border: hsl(252 100% 54% / 0.12);

  /* ---- Semantic Colors ---- */
  --color-success: hsl(142 76% 36%);
  --color-success-light: hsl(142 71% 58%);
  --color-success-bg: hsl(142 71% 58% / 0.12);
  --color-success-subtle: hsl(142 71% 58% / 0.08);
  --color-success-border: hsl(142 71% 58% / 0.2);

  --color-danger: hsl(0 72% 51%);
  --color-danger-light: hsl(0 91% 71%);
  --color-danger-bg: hsl(0 91% 71% / 0.12);
  --color-danger-subtle: hsl(0 91% 71% / 0.08);
  --color-danger-border: hsl(0 91% 71% / 0.2);

  --color-warning: hsl(25 95% 61%);
  --color-warning-bg: hsl(25 95% 61% / 0.12);

  --color-gold: hsl(41 100% 50%);
  --color-gold-bg: hsl(41 100% 50% / 0.12);

  --color-info: hsl(217 83% 53%);
  --color-info-bg: hsl(217 83% 53% / 0.12);

  --color-purple: hsl(263 83% 58%);
  --color-purple-bg: hsl(263 83% 58% / 0.12);

  /* ---- Borders ---- */
  --color-line: hsl(0 0% 0% / 0.08);
  --color-line-subtle: hsl(0 0% 0% / 0.04);
  --color-line-hover: hsl(0 0% 0% / 0.12);
  --color-line-focus: hsl(0 0% 0% / 0.2);
  --color-line-muted: hsl(0 0% 0% / 0.06);

  /* ---- Overlay ---- */
  --color-overlay: hsl(0 0% 0% / 0.3);

  /* ---- Shadows (Light Mode) ---- */
  --shadow-card: 0 1px 3px hsl(0 0% 0% / 0.04), inset 0 1px 0 hsl(0 0% 100% / 0.6);
  --shadow-card-hover: 0 4px 12px hsl(0 0% 0% / 0.08), inset 0 1px 0 hsl(0 0% 100% / 0.6);
  --shadow-nav: 0 1px 0 hsl(0 0% 0% / 0.04);
  --shadow-input: 0 1px 2px hsl(0 0% 0% / 0.03), inset 0 1px 0 hsl(0 0% 100% / 0.4);
  --shadow-elevated: 0 24px 80px hsl(0 0% 0% / 0.12), inset 0 1px 0 hsl(0 0% 100% / 0.8);
  --shadow-button-hover: 0 4px 16px hsl(0 0% 0% / 0.15), inset 0 1px 0 hsl(0 0% 100% / 0.5);

  /* ---- Border Radius ---- */
  --radius-sm: 0.375rem;   /* 6px */
  --radius-md: 0.5rem;     /* 8px — rounded-lg */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-full: 9999px;

  /* ---- Spacing ---- */
  --space-0-5: 0.125rem;   /* 2px */
  --space-1: 0.25rem;      /* 4px */
  --space-1-5: 0.375rem;   /* 6px */
  --space-2: 0.5rem;       /* 8px */
  --space-2-5: 0.625rem;   /* 10px */
  --space-3: 0.75rem;      /* 12px */
  --space-4: 1rem;         /* 16px */
  --space-5: 1.25rem;      /* 20px */
  --space-6: 1.5rem;       /* 24px */
  --space-8: 2rem;         /* 32px */

  /* ---- Transitions ---- */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast: 0.2s;
  --duration-normal: 0.3s;
  --duration-slow: 0.5s;

  /* ---- Z-Index ---- */
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-overlay: 500;
  --z-modal: 1000;
  --z-toast: 1500;

  /* ---- Layout ---- */
  --max-width: 1120px;
  --max-width-settings: 48rem;
  --max-width-modal: 42rem;
  --sidebar-width: 230px;


  /* ================================================================
     BACKWARD COMPATIBILITY MAP
     Old variable names → new Design.md tokens.
     Existing views that use var(--color-primary) etc. keep working.
     ================================================================ */

  /* Old color-* mappings */
  --color-primary: var(--color-accent);
  --color-primary-dark: var(--color-brand);
  --color-primary-light: var(--color-accent-light);
  --color-primary-ghost: var(--color-accent-glow);
  --color-primary-ghost-hover: var(--color-accent-muted);

  /* Old bg/surface mappings */
  --color-bg: var(--color-surface);
  --color-surface-elevated: var(--color-elevated);

  /* Old text mappings */
  --color-text: var(--color-fg);
  --color-text-muted: var(--color-muted);
  --color-text-dim: var(--color-dim);
  --color-text-inverse: var(--color-on-dark);

  /* Old border mappings */
  --color-border: var(--color-line);
  --color-border-light: var(--color-line-subtle);
  --color-border-focus: var(--color-accent);

  /* Old semantic mappings */
  --color-error: var(--color-danger);
  --color-error-muted: var(--color-danger-bg);
  --color-error-dark: hsl(0 62% 30%);
  --color-success-muted: var(--color-success-bg);
  --color-success-dark: hsl(142 76% 22%);
  --color-warning-muted: var(--color-warning-bg);
  --color-warning-dark: hsl(25 80% 30%);
  --color-info-muted: var(--color-info-bg);
  --color-info-dark: hsl(217 80% 35%);

  /* Old shadow mappings */
  --shadow-sm: var(--shadow-card);
  --shadow-md: var(--shadow-card-hover);
  --shadow-lg: var(--shadow-elevated);
  --shadow-xl: var(--shadow-elevated);

  /* Old layout/misc */
  --primary: var(--color-accent);
  --primary-dark: var(--color-brand);
  --bg: var(--color-surface);
  --card: var(--color-elevated);
  --border: var(--color-line);
  --text: var(--color-fg);
  --text-muted: var(--color-muted);
  --success: var(--color-success);
  --error: var(--color-danger);
  --warning: var(--color-warning);

  /* Admin-theme compatibility */
  --admin-primary: var(--color-accent);
  --admin-primary-dark: var(--color-brand);
  --admin-primary-light: var(--color-accent-glow);
  --admin-success: var(--color-success);
  --admin-success-light: var(--color-success-bg);
  --admin-success-dark: var(--color-success-dark);
  --admin-error: var(--color-danger);
  --admin-error-light: var(--color-danger-bg);
  --admin-error-dark: var(--color-error-dark);
  --admin-warning: var(--color-warning);
  --admin-warning-light: var(--color-warning-bg);
  --admin-warning-dark: var(--color-warning-dark);
  --admin-bg: var(--color-surface);
  --admin-card: var(--color-elevated);
  --admin-border: var(--color-line);
  --admin-text: var(--color-fg);
  --admin-text-muted: var(--color-muted);
  --admin-radius: var(--radius-md);
  --admin-radius-lg: var(--radius-lg);
  --admin-radius-sm: var(--radius-sm);
  --admin-shadow-sm: var(--shadow-card);
  --admin-shadow: var(--shadow-card-hover);
  --admin-shadow-lg: var(--shadow-elevated);
  --admin-font: var(--font-body);
  --admin-sidebar-width: var(--sidebar-width);

  /* Glass tokens (mapped to new system) */
  --glass-bg: hsl(0 0% 100% / 0.6);
  --glass-bg-hover: hsl(0 0% 100% / 0.8);
  --glass-border: var(--color-line);
  --glass-border-hover: var(--color-line-hover);
  --glass-blur: blur(12px);
  --glass-blur-light: blur(4px);
}


/* ================================================================
   3. DARK MODE (.dark class)
   ================================================================ */

.dark,
[data-theme="dark"] {
  /* Backgrounds */
  --color-surface: hsl(240 15% 8%);
  --color-base: hsl(240 12% 12%);
  --color-elevated: hsl(240 10% 16%);
  --color-hover: hsl(240 10% 20%);

  /* Text */
  --color-fg: hsl(220 20% 92%);
  --color-fg-hover: hsl(220 15% 82%);
  --color-muted: hsl(220 9% 56%);
  --color-dim: hsl(218 8% 42%);
  --color-on-dark: hsl(240 15% 10%);

  /* Borders (white transparency) */
  --color-line: hsl(0 0% 100% / 0.08);
  --color-line-subtle: hsl(0 0% 100% / 0.04);
  --color-line-hover: hsl(0 0% 100% / 0.12);
  --color-line-focus: hsl(0 0% 100% / 0.2);
  --color-line-muted: hsl(0 0% 100% / 0.06);

  /* Overlay */
  --color-overlay: hsl(0 0% 0% / 0.6);

  /* Shadows (Dark Mode) */
  --shadow-card: 0 1px 3px hsl(0 0% 0% / 0.2), inset 0 1px 0 hsl(0 0% 100% / 0.04);
  --shadow-card-hover: 0 4px 12px hsl(0 0% 0% / 0.3), inset 0 1px 0 hsl(0 0% 100% / 0.04);
  --shadow-nav: 0 1px 0 hsl(0 0% 0% / 0.3);
  --shadow-input: 0 1px 2px hsl(0 0% 0% / 0.2), inset 0 1px 0 hsl(0 0% 100% / 0.03);
  --shadow-elevated: 0 24px 80px hsl(0 0% 0% / 0.4), inset 0 1px 0 hsl(0 0% 100% / 0.06);
  --shadow-button-hover: 0 4px 16px hsl(0 0% 0% / 0.4), inset 0 1px 0 hsl(0 0% 100% / 0.04);

  /* Glass */
  --glass-bg: hsl(0 0% 100% / 0.06);
  --glass-bg-hover: hsl(0 0% 100% / 0.1);
  --glass-border: hsl(0 0% 100% / 0.1);
  --glass-border-hover: hsl(0 0% 100% / 0.18);
}


/* ================================================================
   4. GLOBAL STYLES (from Design.md)
   ================================================================ */

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

body {
  font-family: var(--font-body);
  font-weight: var(--weight-normal);
  font-size: var(--text-base);
  line-height: var(--leading-base);
  color: var(--color-fg);
  background: var(--color-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-tight);
  color: var(--color-fg);
}

/* Focus */
*:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Selection */
::selection {
  background: var(--color-accent-muted);
  color: var(--color-fg);
}

/* Scrollbar */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--color-line); border-radius: 9999px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-line-hover); }

/* Logo invert */
.logo-invert { filter: brightness(0); }
.dark .logo-invert { filter: none; }

/* Button gradient */
.bg-fg {
  background: linear-gradient(to bottom, var(--color-fg-hover), var(--color-fg)) !important;
  color: var(--color-on-dark);
}

.bg-fg:focus-visible {
  outline-color: var(--color-on-dark);
}


/* ================================================================
   5. KEYFRAME ANIMATIONS
   ================================================================ */

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(0.75rem); }
  to { opacity: 1; transform: translateY(0); }
}

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

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.95); }
}

@keyframes pulseDot {
  0%, 100% { box-shadow: 0 0 0 0 currentColor; }
  50% { box-shadow: 0 0 0 6px transparent; }
}

@keyframes scaleIn {
  0% { opacity: 0; transform: scale(0.95); }
  100% { opacity: 1; transform: scale(1); }
}

@keyframes slideDown {
  0% { opacity: 0; transform: translateY(-0.5rem) scale(0.97); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

/* Animation classes */
.animate-fade-up { animation: fadeUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both; }
.animate-fade-in { animation: fadeIn 0.4s ease both; }
.animate-spin { animation: spin 1s linear infinite; }
.animate-pulse { animation: pulse 2s var(--ease-smooth) infinite; }
.anim-pulse-dot { animation: pulseDot 2s var(--ease-smooth) infinite; }
.anim-scale-in { animation: scaleIn var(--duration-fast) cubic-bezier(0.34, 1.56, 0.64, 1) both; }
.anim-slide-down { animation: slideDown var(--duration-fast) var(--ease-out) both; }
.anim-shimmer {
  background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-elevated) 50%, var(--color-surface) 75%);
  background-size: 200% 100%;
  animation: shimmer 2s var(--ease-smooth) infinite;
}

/* Stagger delays */
.stagger-1 { animation-delay: 0.05s; }
.stagger-2 { animation-delay: 0.1s; }
.stagger-3 { animation-delay: 0.15s; }
.stagger-4 { animation-delay: 0.2s; }
.stagger-5 { animation-delay: 0.25s; }
.stagger-6 { animation-delay: 0.3s; }
.stagger-7 { animation-delay: 0.35s; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .animate-fade-up,
  .animate-fade-in,
  .animate-spin,
  .animate-pulse { animation: none; }
  * { transition-duration: 0.01ms !important; }
}


/* ================================================================
   6. UTILITY CLASSES
   ================================================================ */

/* Text utilities */
.text-heading {
  font-family: var(--font-heading);
  font-weight: var(--weight-bold);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-fg);
}

.text-body {
  font-family: var(--font-body);
  font-weight: var(--weight-normal);
  line-height: var(--leading-normal);
  color: var(--color-fg);
}

.text-label {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-muted);
}

.text-mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* Cards */
.surface-card {
  background: var(--color-elevated);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  transition: all var(--duration-normal) ease;
}

.surface-card:hover {
  border-color: var(--color-line-hover);
  box-shadow: var(--shadow-card-hover);
}

.surface-card--static {
  background: var(--color-elevated);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

/* Glass card */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  transition: all var(--duration-fast) var(--ease-out);
}

.glass-card:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-card-hover);
}

/* Buttons — Primary (dark gradient) */
.glass-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 0.75rem;
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  font-family: var(--font-body);
  color: var(--color-fg);
  background: var(--color-elevated);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  text-decoration: none;
  line-height: var(--leading-snug);
}

.glass-btn:hover {
  background: var(--color-hover);
  border-color: var(--color-line-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-button-hover);
}

.glass-btn:active {
  transform: translateY(0);
}

.glass-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

.glass-btn--primary {
  background: linear-gradient(to bottom, var(--color-fg-hover), var(--color-fg));
  border-color: transparent;
  color: var(--color-on-dark);
}

.glass-btn--primary:hover {
  background: var(--color-fg-hover);
  box-shadow: var(--shadow-button-hover);
}

.glass-btn--danger {
  background: var(--color-danger-subtle);
  border: 1px solid var(--color-danger-border);
  color: var(--color-danger);
}

.glass-btn--danger:hover {
  background: var(--color-danger-bg);
}

.glass-btn--ghost {
  background: transparent;
  border: 1px solid var(--color-line);
  color: var(--color-muted);
}

.glass-btn--ghost:hover {
  background: var(--color-line-subtle);
  border-color: var(--color-line-hover);
  color: var(--color-fg);
}

.glass-btn--sm {
  padding: 0.25rem 0.625rem;
  font-size: var(--text-xs);
}

.glass-btn--lg {
  padding: 0.5rem 1.25rem;
  font-size: var(--text-sm);
}

/* Badges */
.brand-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  line-height: var(--leading-snug);
}

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

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

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

.brand-badge--info {
  background: var(--color-info-bg);
  color: var(--color-info);
}

.brand-badge--neutral {
  background: var(--color-line-muted);
  color: var(--color-muted);
}

.brand-badge--accent {
  background: var(--color-purple-bg);
  color: var(--color-purple);
}

/* Input */
.brand-input {
  width: 100%;
  padding: 0.375rem 0.75rem;
  background: var(--color-elevated);
  color: var(--color-fg);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-family: var(--font-body);
  line-height: var(--leading-normal);
  outline: none;
  transition: border-color var(--duration-normal) ease, box-shadow var(--duration-normal) ease;
  box-shadow: var(--shadow-input);
  box-sizing: border-box;
}

.brand-input::placeholder {
  color: var(--color-dim);
}

.brand-input:focus {
  border-color: var(--color-line-focus);
  outline: none;
}

.brand-input--error {
  border-color: var(--color-danger);
}

/* Divider */
.brand-divider {
  height: 1px;
  background: var(--color-line);
  border: none;
  margin: var(--space-6) 0;
}

.brand-divider--tight {
  margin: var(--space-3) 0;
}

/* Spinner */
.spinner {
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid var(--color-accent);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Skeleton loader */
.skeleton {
  position: relative;
  overflow: hidden;
  background: var(--color-surface);
  border-radius: var(--radius-sm);
}

.skeleton::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 25%, var(--color-elevated) 50%, transparent 75%);
  background-size: 200% 100%;
  animation: shimmer 2s var(--ease-smooth) infinite;
}

/* Value flash animations (for KPI cards) */
@keyframes valueFlashGreen {
  0% { color: var(--color-success); transform: scale(1.05); }
  100% { color: var(--color-fg); transform: scale(1); }
}

@keyframes valueFlashRed {
  0% { color: var(--color-danger); transform: scale(1.05); }
  100% { color: var(--color-fg); transform: scale(1); }
}

@keyframes valueFlashNeutral {
  0% { color: var(--color-muted); }
  100% { color: var(--color-fg); }
}


/* ================================================================
   7. SCROLLBAR (branded)
   ================================================================ */

.brand-scrollbar::-webkit-scrollbar { width: 5px; height: 5px; }
.brand-scrollbar::-webkit-scrollbar-track { background: transparent; }
.brand-scrollbar::-webkit-scrollbar-thumb { background: var(--color-line); border-radius: 9999px; }
.brand-scrollbar::-webkit-scrollbar-thumb:hover { background: var(--color-line-hover); }


/* ================================================================
   8. RESPONSIVE
   ================================================================ */

@media (max-width: 768px) {
  :root {
    --text-2xl: 1.25rem;
    --text-xl: 1.125rem;
  }
}