:root {
  /* Elegant Dark Theme Palette (Deep Charcoal/Blue hue) */
  --bg-main: hsl(224, 18%, 8%);
  --bg-sidebar: hsl(224, 18%, 10%);
  --bg-card: hsl(224, 16%, 13%);
  --bg-card-hover: hsl(224, 16%, 16%);
  --bg-input: hsl(224, 15%, 15%);
  --bg-glass: rgba(22, 27, 38, 0.75);
  --text-primary: hsl(220, 25%, 98%);
  --text-secondary: hsl(220, 15%, 78%);
  --text-muted: hsl(220, 12%, 58%);
  --border-color: hsl(224, 15%, 22%);
  --border-glow: rgba(34, 197, 94, 0.4);

  /* Vibrant Accents */
  --accent-color: hsl(145, 68%, 46%);
  --accent-hover: hsl(145, 68%, 54%);
  --danger-color: hsl(0, 85%, 65%);
  --danger-hover: hsl(0, 85%, 72%);
  --info-color: hsl(210, 100%, 65%);
  --warning-color: hsl(42, 95%, 55%);

  /* Translucent Backgrounds for Alerts */
  --accent-bg: hsla(145, 68%, 46%, 0.15);
  --danger-bg: hsla(0, 85%, 65%, 0.15);
  --info-bg: hsla(210, 100%, 65%, 0.15);
  --warning-bg: hsla(42, 95%, 55%, 0.15);

  --shadow-card: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 20px rgba(34, 197, 94, 0.15);
}

[data-theme="light"] {
  /* Crisp Light Theme Palette */
  --bg-main: hsl(220, 16%, 98%);
  --bg-sidebar: hsl(220, 16%, 94%);
  --bg-card: #ffffff;
  --bg-card-hover: hsl(220, 15%, 96%);
  --bg-input: hsl(220, 12%, 91%);
  --bg-glass: rgba(255, 255, 255, 0.85);
  --text-primary: hsl(220, 25%, 15%);
  --text-secondary: hsl(220, 15%, 35%);
  --text-muted: hsl(220, 10%, 52%);
  --border-color: hsl(220, 12%, 86%);
  --border-glow: rgba(22, 163, 74, 0.3);

  --accent-color: hsl(150, 75%, 36%);
  --accent-hover: hsl(150, 75%, 43%);
  --danger-color: hsl(0, 75%, 48%);
  --danger-hover: hsl(0, 75%, 55%);
  --info-color: hsl(210, 85%, 48%);
  --warning-color: hsl(40, 95%, 45%);

  --accent-bg: hsla(150, 75%, 36%, 0.1);
  --danger-bg: hsla(0, 75%, 48%, 0.08);
  --info-bg: hsla(210, 85%, 48%, 0.1);
  --warning-bg: hsla(40, 95%, 45%, 0.1);

  --shadow-card: 0 8px 24px rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 0 15px rgba(22, 163, 74, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  display: flex;
  height: 100vh;
  overflow: hidden;
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    Helvetica,
    Arial,
    sans-serif;
  transition:
    background-color 0.3s ease,
    color 0.3s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#root {
  display: flex;
  width: 100%;
  height: 100%;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

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

button {
  font-family: inherit;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

button:active:not(:disabled) {
  transform: translateY(1px);
}

input,
select {
  font-family: inherit;
}

/* Utility Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.animate-fade-in {
  animation: fadeIn 0.25s ease-out forwards;
}

/* Glassmorphic card styling */
.glass-panel {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 12px;
}

.app-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  box-shadow: var(--shadow-card);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.app-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-color);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow), var(--shadow-card);
}