/* ============================================================
   ENGELS811 SPOTIFY HQ – CENTRAL DESIGN SYSTEM
   ============================================================

   This file establishes the unified visual language for:
   - Dashboard (/admin/spotify)
   - Settings (/admin/spotify/settings)
   - OAuth Callback Appearance (/admin/spotify/callback-appearance)

   Color Palette: Red + Black + White
   Typography: IBM Plex Mono + Roboto + Inter
   Theme: Dark-first, Red Neon, Glassmorphism, Gaming/Streaming HQ

   ============================================================ */

/* ============================================================
   ROOT VARIABLES – Color System
   ============================================================ */

:root {
  /* Primary Reds */
  --engels-red:           #e81818;
  --engels-red-bright:    #ff2f43;
  --engels-red-dark:      #8b0d0d;
  --engels-red-muted:     rgba(232, 24, 24, 0.2);

  /* Accent Green (Spotify) */
  --spotify-green:        #1db954;

  /* Blacks & Grays */
  --black-primary:        #0a0a0a;
  --black-secondary:      #1a1a1a;
  --black-tertiary:       #242424;
  --gray-800:             #2a2a2a;
  --gray-700:             #3a3a3a;
  --gray-600:             #4a4a4a;

  /* Whites & Lights */
  --white-primary:        #ffffff;
  --white-secondary:      #f5f5f5;
  --white-tertiary:       #e5e5e5;

  /* Text Colors */
  --text-primary:         #ffffff;
  --text-secondary:       #9ca3af;
  --text-muted:           #6b7280;
  --text-inverse:         #0a0a0a;

  /* Glass Effects */
  --glass-light:          rgba(255, 255, 255, 0.07);
  --glass-lighter:        rgba(255, 255, 255, 0.12);
  --glass-dark:           rgba(0, 0, 0, 0.4);

  /* Borders & Glows */
  --border-subtle:        rgba(255, 255, 255, 0.05);
  --border-soft:          rgba(255, 255, 255, 0.1);
  --border-medium:        rgba(255, 255, 255, 0.15);
  --border-red-glow:      rgba(232, 24, 24, 0.4);
  --border-red-bright:    rgba(255, 47, 67, 0.6);

  /* Status Colors */
  --status-success:       #10b981;
  --status-warning:       #f59e0b;
  --status-error:         #ef4444;

  /* Background Layers */
  --bg-primary:           var(--black-primary);
  --bg-secondary:         var(--black-secondary);
  --bg-card:              var(--black-tertiary);
  --bg-input:             rgba(255, 255, 255, 0.04);

  /* Spacing Scale */
  --spacing-xs:           4px;
  --spacing-sm:           8px;
  --spacing-md:           12px;
  --spacing-lg:           16px;
  --spacing-xl:           24px;
  --spacing-2xl:          32px;
  --spacing-3xl:          48px;

  /* Typography Scale */
  --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 */
  --text-5xl:             3rem;      /* 48px */

  /* Borders & Radius */
  --radius-xs:            4px;
  --radius-sm:            8px;
  --radius-md:            12px;
  --radius-lg:            16px;
  --radius-xl:            20px;
  --radius-2xl:           24px;

  /* Transitions */
  --transition-fast:      150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition:           250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow:      350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Shadows */
  --shadow-xs:            0 2px 4px rgba(0, 0, 0, 0.4);
  --shadow-sm:            0 4px 8px rgba(0, 0, 0, 0.5);
  --shadow-md:            0 8px 16px rgba(0, 0, 0, 0.6);
  --shadow-lg:            0 16px 32px rgba(0, 0, 0, 0.7);
  --shadow-xl:            0 24px 48px rgba(0, 0, 0, 0.8);

  /* Glows */
  --glow-red-sm:          0 0 16px rgba(232, 24, 24, 0.4);
  --glow-red-md:          0 0 24px rgba(232, 24, 24, 0.5);
  --glow-red-lg:          0 0 32px rgba(232, 24, 24, 0.6);

  /* Font Families */
  --font-display:         'IBM Plex Mono', monospace;
  --font-heading:         'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body:            'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:            'IBM Plex Mono', monospace;
}

/* Light Theme (Explicit Override) */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --black-primary:        #f5f5f5;
    --black-secondary:      #e5e5e5;
    --black-tertiary:       #d5d5d5;
    --gray-800:             #c0c0c0;
    --text-primary:         #0a0a0a;
    --text-secondary:       #4a4a4a;
    --text-muted:           #7a7a7a;
    --text-inverse:         #ffffff;
    --border-subtle:        rgba(0, 0, 0, 0.05);
    --border-soft:          rgba(0, 0, 0, 0.1);
    --bg-input:             rgba(0, 0, 0, 0.04);
  }
}

/* Dark Theme Explicit */
:root[data-theme="dark"] {
  --black-primary:        #0a0a0a;
  --black-secondary:      #1a1a1a;
  --text-primary:         #ffffff;
}

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

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================================
   TYPOGRAPHY SCALE
   ============================================================ */

h1 {
  font-family: var(--font-display);
  font-size: var(--text-4xl);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  text-wrap: balance;
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: 600;
  line-height: 1.3;
  text-wrap: balance;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--spacing-md);
}

h4 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--spacing-sm);
}

h5, h6 {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

p {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

small {
  font-size: var(--text-sm);
  color: var(--text-muted);
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-card);
  padding: 2px 6px;
  border-radius: var(--radius-xs);
}

/* ============================================================
   COMPONENT BASE – Cards
   ============================================================ */

.spotify-hq-card {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(10px);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.spotify-hq-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--glass-light) 0%, transparent 100%);
  pointer-events: none;
  opacity: 0.5;
}

.spotify-hq-card:hover {
  border-color: var(--border-red-glow);
  box-shadow: var(--shadow-lg), var(--glow-red-sm);
}

.spotify-hq-card.no-hover:hover {
  border-color: var(--border-soft);
  box-shadow: var(--shadow-md);
}

/* ============================================================
   COMPONENT BASE – Buttons
   ============================================================ */

.spotify-hq-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  min-height: 40px;
}

/* Primary Button (Red) */
.spotify-hq-btn--primary {
  background: linear-gradient(135deg, var(--engels-red), var(--engels-red-bright));
  color: var(--white-primary);
  border-color: var(--engels-red-bright);
  box-shadow: var(--glow-red-md);
}

.spotify-hq-btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-red-lg);
  background: linear-gradient(135deg, var(--engels-red-bright), #ff4455);
}

.spotify-hq-btn--primary:active {
  transform: translateY(0);
}

/* Ghost Button */
.spotify-hq-btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-soft);
}

.spotify-hq-btn--ghost:hover {
  background: var(--glass-light);
  border-color: var(--border-red-glow);
}

/* Secondary Button */
.spotify-hq-btn--secondary {
  background: var(--glass-light);
  color: var(--text-primary);
  border-color: var(--border-soft);
}

.spotify-hq-btn--secondary:hover {
  background: var(--glass-lighter);
  border-color: var(--border-red-glow);
}

/* Danger Button */
.spotify-hq-btn--danger {
  background: rgba(239, 68, 68, 0.15);
  color: var(--status-error);
  border-color: rgba(239, 68, 68, 0.3);
}

.spotify-hq-btn--danger:hover {
  background: rgba(239, 68, 68, 0.25);
  border-color: var(--status-error);
}

/* Button Sizes */
.spotify-hq-btn--sm {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--text-xs);
  min-height: 32px;
}

.spotify-hq-btn--lg {
  padding: var(--spacing-lg) var(--spacing-2xl);
  font-size: var(--text-base);
  min-height: 48px;
}

/* Disabled State */
.spotify-hq-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ============================================================
   COMPONENT BASE – Badges
   ============================================================ */

.spotify-hq-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 999px;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
}

.spotify-hq-badge--success {
  background: rgba(16, 185, 129, 0.15);
  color: var(--status-success);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.spotify-hq-badge--warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--status-warning);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.spotify-hq-badge--error {
  background: rgba(239, 68, 68, 0.15);
  color: var(--status-error);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.spotify-hq-badge--red {
  background: rgba(232, 24, 24, 0.15);
  color: var(--engels-red);
  border: 1px solid rgba(232, 24, 24, 0.3);
}

/* ============================================================
   COMPONENT BASE – Status Indicators
   ============================================================ */

.spotify-hq-status {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  background: var(--glass-light);
  border: 1px solid var(--border-soft);
  font-size: var(--text-sm);
}

.spotify-hq-status__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}

.spotify-hq-status__dot--live {
  background: var(--status-success);
  box-shadow: 0 0 8px var(--status-success);
}

.spotify-hq-status__dot--connecting {
  background: var(--status-warning);
  box-shadow: 0 0 8px var(--status-warning);
}

.spotify-hq-status__dot--error {
  background: var(--status-error);
  box-shadow: 0 0 8px var(--status-error);
}

.spotify-hq-status__dot--idle {
  background: var(--gray-600);
  animation: none;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

/* ============================================================
   COMPONENT BASE – Form Elements
   ============================================================ */

.spotify-hq-input,
.spotify-hq-textarea,
.spotify-hq-select {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-soft);
  background: var(--bg-input);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--text-base);
  transition: all var(--transition-fast);
}

.spotify-hq-input:focus,
.spotify-hq-textarea:focus,
.spotify-hq-select:focus {
  outline: none;
  border-color: var(--engels-red);
  box-shadow: 0 0 16px rgba(232, 24, 24, 0.3);
  background: rgba(232, 24, 24, 0.05);
}

.spotify-hq-input::placeholder {
  color: var(--text-muted);
}

.spotify-hq-textarea {
  resize: vertical;
  min-height: 100px;
}

.spotify-hq-select {
  appearance: none;
  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239ca3af' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
  background-repeat: no-repeat;
  background-position: right 12px center;
  background-size: 16px;
  padding-right: 40px;
}

/* ============================================================
   COMPONENT BASE – Grid Layout
   ============================================================ */

.spotify-hq-grid {
  display: grid;
  gap: var(--spacing-lg);
}

.spotify-hq-grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.spotify-hq-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.spotify-hq-grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */

@media (max-width: 1200px) {
  .spotify-hq-grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: var(--text-3xl);
  }

  h2 {
    font-size: var(--text-2xl);
  }

  .spotify-hq-grid--2,
  .spotify-hq-grid--3,
  .spotify-hq-grid--4 {
    grid-template-columns: 1fr;
  }

  .spotify-hq-btn {
    width: 100%;
  }
}

/* ============================================================
   ACCESSIBILITY
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (prefers-contrast: more) {
  .spotify-hq-btn {
    border-width: 2px;
  }

  .spotify-hq-card {
    border-width: 2px;
  }

  .spotify-hq-badge {
    border-width: 2px;
  }
}

/* Focus Visible for Keyboard Navigation */
.spotify-hq-btn:focus-visible,
.spotify-hq-input:focus-visible,
.spotify-hq-select:focus-visible {
  outline: 2px solid var(--engels-red);
  outline-offset: 2px;
}

/* ============================================================
   UTILITY CLASSES
   ============================================================ */

.flex {
  display: flex;
}

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

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

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.px-lg { padding-left: var(--spacing-lg); padding-right: var(--spacing-lg); }
.py-lg { padding-top: var(--spacing-lg); padding-bottom: var(--spacing-lg); }

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

.opacity-50 { opacity: 0.5; }
.opacity-75 { opacity: 0.75; }

.hidden { display: none !important; }

/* ============================================================
   END: spotify-hq-system.css
   ============================================================ */