/* ═══════════════════════════════════════════════════════════════════════════
   AudioBook Player – Design System Tokens
   Theme: "Reading at Night" – cozy, warm, elegant
   ═══════════════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ─── Dark Mode (Default) ─────────────────────────────────────────────────── */
:root {
  /* Backgrounds */
  --bg-primary: #0a0e17;
  --bg-secondary: #131a2b;
  --bg-tertiary: #1a2340;
  --bg-glass: rgba(19, 26, 43, 0.85);
  --bg-overlay: rgba(0, 0, 0, 0.6);

  /* Borders */
  --border: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.12);
  --border-active: rgba(232, 168, 56, 0.3);

  /* Text */
  --text-primary: #f0f0f5;
  --text-secondary: #7a829a;
  --text-muted: #4a5068;

  /* Accent */
  --accent: #e8a838;
  --accent-hover: #f0b84d;
  --accent-glow: rgba(232, 168, 56, 0.15);
  --accent-secondary: #c084fc;
  --accent-secondary-glow: rgba(192, 132, 252, 0.15);

  /* Status */
  --success: #34d399;
  --error: #f87171;
  --warning: #fbbf24;
  --info: #60a5fa;

  /* Gradients */
  --gradient-accent: linear-gradient(135deg, #e8a838, #f59e0b);
  --gradient-bg: linear-gradient(135deg, #0a0e17 0%, #131a2b 50%, #0f1525 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
  --shadow-accent: 0 4px 20px rgba(232, 168, 56, 0.25);

  /* Radii */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 0.9375rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --line-height: 1.6;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;
  --transition-spring: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Layout */
  --sidebar-width: 320px;
  --header-height: 60px;
  --player-height: 220px;

  /* Scrollbar */
  --scrollbar-width: 6px;
  --scrollbar-track: transparent;
  --scrollbar-thumb: rgba(255, 255, 255, 0.1);
  --scrollbar-thumb-hover: rgba(255, 255, 255, 0.2);
}

/* ─── Light Mode ──────────────────────────────────────────────────────────── */
[data-theme="light"] {
  --bg-primary: #f8f6f1;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f0ede5;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --bg-overlay: rgba(0, 0, 0, 0.3);

  --border: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.15);
  --border-active: rgba(212, 148, 31, 0.3);

  --text-primary: #1a1a2e;
  --text-secondary: #5a5a7a;
  --text-muted: #9a9ab0;

  --accent: #d4941f;
  --accent-hover: #c08518;
  --accent-glow: rgba(212, 148, 31, 0.12);
  --accent-secondary: #9333ea;
  --accent-secondary-glow: rgba(147, 51, 234, 0.12);

  --gradient-bg: linear-gradient(135deg, #f8f6f1 0%, #f0ede5 50%, #f5f3ee 100%);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.1);
  --shadow-accent: 0 4px 20px rgba(212, 148, 31, 0.2);

  --scrollbar-thumb: rgba(0, 0, 0, 0.15);
  --scrollbar-thumb-hover: rgba(0, 0, 0, 0.25);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: background-color var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
}

/* ─── Scrollbar ───────────────────────────────────────────────────────────── */
::-webkit-scrollbar {
  width: var(--scrollbar-width);
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

/* ─── Selection ───────────────────────────────────────────────────────────── */
::selection {
  background: var(--accent-glow);
  color: var(--accent);
}

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

/* ─── Utility Animations ──────────────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-12px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}

@keyframes slideInRight {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

@keyframes slideInUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

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

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

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

@keyframes breathe {
  0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); }
  50% { box-shadow: 0 0 20px 4px var(--accent-glow); }
}

/* ─── Toast Styles ────────────────────────────────────────────────────────── */
.toast-container {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  font-weight: 500;
  box-shadow: var(--shadow-md);
  animation: fadeInDown var(--transition-base) ease forwards;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  max-width: 380px;
}

.toast.toast-success { border-left: 3px solid var(--success); }
.toast.toast-error   { border-left: 3px solid var(--error); }
.toast.toast-warning { border-left: 3px solid var(--warning); }
.toast.toast-info    { border-left: 3px solid var(--info); }

.toast.toast-exit {
  animation: fadeOut 0.3s ease forwards;
}

@keyframes fadeOut {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(-8px); }
}