/* Theme variables */
:root {
  /* Spacing system */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 0.75rem;
  --spacing-lg: 1rem;
  --spacing-xl: 1.5rem;
  --spacing-2xl: 2rem;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;

  /* Colors */
  --bg-primary: #f8f9fa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f3f5;
  --bg-input-dark: #e9ecef;
  --bg-zebra-odd: #ffffff;
  --bg-zebra-even: #f8f9fa;
  --bg-highlight-blue1: #e7f5ff;
  --bg-highlight-blue2: #d0ebff;
  --border-primary: #e0e0e0;
  --border-secondary: #d0d0d0;
  --border-hover: #a0a0a0;
  --text-primary: #2c3e50;
  --text-secondary: #6c757d;
  --button-bg: #ffffff;
  --button-hover: #f8f9fa;
  --button-active: #e9ecef;
  --modal-overlay: rgba(0, 0, 0, 0.6);
  --highlight-border: #339af0;
  --highlight-border-strong: #1971c2;
  --accent-primary: #339af0;
  --accent-hover: #1971c2;
  --danger: #fa5252;
  --danger-hover: #e03131;
  --success: #51cf66;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.12);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;
}

[data-theme="dark"] {
  --bg-primary: #1a1b1e;
  --bg-secondary: #25262b;
  --bg-tertiary: #2c2e33;
  --bg-input-dark: #1a1b1e;
  --bg-zebra-odd: #25262b;
  --bg-zebra-even: #2c2e33;
  --bg-highlight-blue1: #1e3a5f;
  --bg-highlight-blue2: #1a4971;
  --border-primary: #373a40;
  --border-secondary: #495057;
  --border-hover: #6c757d;
  --text-primary: #e9ecef;
  --text-secondary: #adb5bd;
  --button-bg: #373a40;
  --button-hover: #495057;
  --button-active: #5c5f66;
  --modal-overlay: rgba(0, 0, 0, 0.8);
  --highlight-border: #4dabf7;
  --highlight-border-strong: #339af0;
  --accent-primary: #339af0;
  --accent-hover: #4dabf7;
  --danger: #fa5252;
  --danger-hover: #ff6b6b;
  --success: #69db7c;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);
}

/* Reset and base styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-slow), color var(--transition-slow);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Layout */
.app-container {
  display: flex;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
  position: relative;
}

.sidebar {
  width: 250px;
  background-color: var(--bg-secondary);
  overflow-y: auto;
  flex-shrink: 0;
  transition: margin-left var(--transition-slow);
  position: relative;
  z-index: 10;
  min-width: 150px;
  max-width: 600px;
  border-right: 1px solid var(--border-primary);
  box-shadow: var(--shadow-sm);
}

.sidebar.collapsed {
  margin-left: calc(-1 * var(--sidebar-width, 250px));
}

.sidebar.resizing {
  transition: none;
}

.sidebar-resize-handle {
  width: 4px;
  background-color: transparent;
  cursor: col-resize;
  flex-shrink: 0;
  position: relative;
  z-index: 11;
  transition: background-color var(--transition-base);
}

.sidebar-resize-handle:hover,
.sidebar-resize-handle.resizing {
  background-color: var(--accent-primary);
  box-shadow: 0 0 8px var(--accent-primary);
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: margin-left var(--transition-slow);
  background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%);
}

.header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-primary);
  padding: var(--spacing-lg) var(--spacing-xl);
  flex-shrink: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.theme-toggle {
  display: flex;
  gap: var(--spacing-xs);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: var(--spacing-xs);
  box-shadow: var(--shadow-sm);
}

.theme-toggle button {
  padding: 0.4rem 0.8rem;
  border: none;
  background-color: transparent;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-base);
  font-weight: 500;
}

.theme-toggle button:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.theme-toggle button.active {
  background-color: var(--accent-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.snippet-list-container {
  flex: 1;
  overflow-y: auto;
  background-color: var(--bg-tertiary);
}

/* Zebra striping */
.zebra-even {
  background-color: var(--bg-zebra-even);
}

.zebra-odd {
  background-color: var(--bg-zebra-odd);
}

/* Highlight colors */
.highlight-blue1 {
  background: linear-gradient(90deg, var(--bg-highlight-blue1) 0%, var(--bg-highlight-blue2) 100%);
  border-left: 3px solid var(--highlight-border);
  box-shadow: inset 0 0 0 1px var(--highlight-border);
}

.highlight-blue2 {
  background: linear-gradient(90deg, var(--bg-highlight-blue2) 0%, var(--bg-highlight-blue1) 100%);
  border-left: 3px solid var(--highlight-border-strong);
  box-shadow: inset 0 0 0 1px var(--highlight-border-strong);
}

/* Button styles */
.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border: 1px solid var(--border-secondary);
  border-radius: var(--radius-md);
  background-color: var(--button-bg);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.btn:hover {
  background-color: var(--button-hover);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.btn:active {
  background-color: var(--button-active);
  box-shadow: var(--shadow-sm);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent-primary);
  color: #fff;
  border-color: var(--accent-primary);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

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

.btn-small {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 12px;
}

.btn-icon {
  background: none;
  border: none;
  padding: var(--spacing-sm);
  cursor: pointer;
  color: var(--text-primary);
  font-size: 1.25rem;
  line-height: 1;
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-icon:hover {
  background-color: var(--button-hover);
  box-shadow: var(--shadow-sm);
}

.btn-icon:active {
  background-color: var(--button-active);
}

.sidebar-toggle-icon {
  display: block;
  font-size: 1.25rem;
  line-height: 1;
}

/* Dialog/Modal styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--modal-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
  animation: fadeIn var(--transition-base);
}

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

.modal-dialog {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  min-width: 400px;
  max-width: 500px;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-primary);
  animation: slideUp var(--transition-base);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.modal-header {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.modal-body {
  margin-bottom: var(--spacing-xl);
}

.modal-field {
  margin-bottom: var(--spacing-lg);
}

.modal-field label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
  font-size: 13px;
}

.modal-field select {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  font-size: 14px;
  background-color: var(--button-bg);
  color: var(--text-primary);
  transition: all var(--transition-base);
}

.modal-field select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(51, 154, 240, 0.1);
}

.modal-actions {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: flex-end;
}

.modal-actions .btn {
  min-width: 80px;
}

/* Mobile responsiveness */
@media (max-width: 640px) {
  .btn-small {
    padding: 0.5rem 0.625rem;
    font-size: 13px;
    min-height: 36px;
  }

  .header {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  .header h1 {
    font-size: 1.25rem;
  }

  .theme-toggle {
    gap: 2px;
    padding: 2px;
  }

  .theme-toggle button {
    padding: 0.35rem 0.6rem;
    font-size: 11px;
  }

  .sidebar {
    position: absolute;
    z-index: 100;
    height: 100%;
    box-shadow: var(--shadow-lg);
  }

  .sidebar.collapsed {
    margin-left: -100%;
  }

  .btn-icon#sidebar-toggle {
    background-color: var(--bg-secondary);
    box-shadow: var(--shadow-md);
    z-index: 101;
    position: relative;
  }

  .modal-dialog {
    min-width: 90vw;
    max-width: 95vw;
    margin: var(--spacing-md);
  }
}