:root {
  /* Surfaces — no pure white, no pure black */
  --color-background: #eee;
  --color-surface: #f7f7f7;
  --color-surface-light: #eee;
  --color-surface-raised: #fafafa;
  --color-border: #ddd;
  --color-border-light: #e8e8e8;

  /* Text — layered grays */
  --color-text-primary: #333;
  --color-text-secondary: #555;
  --color-text-muted: #999;
  --color-text-disabled: #bbb;

  /* Interaction colors — stay gray */
  --color-primary: #333;
  --color-primary-hover: #222;
  --color-secondary: #777;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;
  --color-info: #06B6D4;

  /* Sidebar (kept for reference, but unused in topbar layout) */
  --color-sidebar-bg: #e5e5e5;
  --color-sidebar-hover: #ddd;
  --color-sidebar-active: #ccc;

  /* Forms */
  --color-form-bg: #f7f7f7;
  --color-form-border: #ddd;
  --color-form-text: #333;

  /* Shadows — subtle, gray */
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.08);
  --shadow-md: 0 2px 8px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 8px 24px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 16px 40px rgb(0 0 0 / 0.1);
  --shadow-card: 0 1px 4px rgb(0 0 0 / 0.06);
  --shadow-btn: 0 1px 3px rgb(0 0 0 / 0.12);

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;

  /* Typography */
  --font-family-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;

  --font-size-xs: 0.7rem;
  --font-size-sm: 0.8rem;
  --font-size-base: 0.9rem;
  --font-size-lg: 1rem;
  --font-size-xl: 1.15rem;
  --font-size-2xl: 1.4rem;
  --font-size-3xl: 1.75rem;
  --font-size-4xl: 2.1rem;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 0.75rem;
  --spacing-lg: 1.25rem;
  --spacing-xl: 1.75rem;
  --spacing-2xl: 2.5rem;

  --transition-fast: 120ms ease;
  --transition-normal: 200ms ease;
  --transition-slow: 350ms ease;

  --z-index-dropdown: 1000;
  --z-index-sticky: 1020;
  --z-index-fixed: 1030;
  --z-index-modal: 1040;
  --z-index-popover: 1050;
  --z-index-tooltip: 1060;
}

[data-theme="dark"] {
  --color-background: #1a1a1a;
  --color-surface: #2a2a2a;
  --color-surface-light: #333;
  --color-surface-raised: #252525;
  --color-border: #444;
  --color-border-light: #3a3a3a;

  --color-text-primary: #e0e0e0;
  --color-text-secondary: #b0b0b0;
  --color-text-muted: #808080;
  --color-text-disabled: #606060;

  --color-primary: #477EF7;
  --color-primary-hover: #7C3AED;
  --color-secondary: #666;
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-danger: #EF4444;
  --color-info: #06B6D4;

  --color-sidebar-bg: #222;
  --color-sidebar-hover: #333;
  --color-sidebar-active: #444;

  --color-form-bg: #333;
  --color-form-border: #555;
  --color-form-text: #ddd;

  --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.3);
  --shadow-md: 0 2px 8px rgb(0 0 0 / 0.3);
  --shadow-lg: 0 8px 24px rgb(0 0 0 / 0.3);
  --shadow-xl: 0 16px 40px rgb(0 0 0 / 0.3);
  --shadow-card: 0 1px 4px rgb(0 0 0 / 0.2);
  --shadow-btn: 0 1px 3px rgb(0 0 0 / 0.3);
}

/* ─── Bootstrap overrides ────────────────────────────────── */

.btn-primary {
  background-color: var(--color-primary) !important;
  border-color: var(--color-primary) !important;
  color: #eee !important;
}

.btn-primary:hover {
  background-color: var(--color-primary-hover) !important;
  border-color: var(--color-primary-hover) !important;
  color: #eee !important;
}

.btn-outline-primary {
  border-color: var(--color-border) !important;
  color: var(--color-text-secondary) !important;
  background: transparent !important;
}

.btn-outline-primary:hover {
  background-color: var(--color-primary) !important;
  border-color: var(--color-primary) !important;
  color: #eee !important;
}

a {
  color: var(--color-text-secondary) !important;
}

a:hover {
  color: var(--color-text-primary) !important;
}

.link-primary {
  color: var(--color-text-secondary) !important;
}

.link-primary:hover {
  color: var(--color-text-primary) !important;
}

/* ─── Form Elements - Light Mode ──────────────────────── */

/* Input fields */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="tel"],
input[type="url"],
input[type="search"],
input[type="datetime-local"],
input[type="date"],
input[type="time"],
textarea,
select {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  font-size: var(--font-size-sm);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

/* Input focus states */
input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(71, 126, 247, 0.12);
}

/* Input placeholders */
::placeholder {
  color: var(--color-text-muted);
  opacity: 1;
}

/* Select dropdowns */
select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23333' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
  padding-right: 2rem;
}

/* Buttons */
.btn,
button,
input[type="submit"],
input[type="button"],
input[type="reset"] {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

/* Primary buttons */
.btn-primary,
button.btn-primary,
input[type="submit"].btn-primary {
  background-color: var(--color-primary);
  color: #eee;
  border-color: var(--color-primary);
}

.btn-primary:hover,
button.btn-primary:hover,
input[type="submit"].btn-primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #eee;
}

/* Outline buttons */
.btn-outline-primary,
button.btn-outline-primary {
  background-color: transparent;
  border-color: var(--color-border);
  color: var(--color-text-secondary);
}

.btn-outline-primary:hover,
button.btn-outline-primary:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #eee;
}

/* Secondary buttons */
.btn-secondary,
button.btn-secondary {
  background-color: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-secondary);
}

.btn-secondary:hover,
button.btn-secondary:hover {
  background-color: var(--color-surface-light);
  color: var(--color-text-primary);
}

/* Danger buttons */
.btn-danger,
button.btn-danger {
  background-color: var(--color-danger);
  border-color: var(--color-danger);
  color: #fff;
}

.btn-danger:hover,
button.btn-danger:hover {
  background-color: var(--color-danger);
  border-color: var(--color-danger);
  color: #fff;
  opacity: 0.9;
}

/* Cards */
.card,
.card-body {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  color: var(--color-text-primary);
}

.card-title {
  color: var(--color-text-primary);
}

.card-text {
  color: var(--color-text-secondary);
}

.card-header {
  background-color: var(--color-surface-light);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-primary);
}

/* Form control styling */
.form-control {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
}

.form-control:focus {
  background-color: var(--color-surface);
  border-color: var(--color-primary);
  color: var(--color-text-primary);
  box-shadow: 0 0 0 3px rgba(71, 126, 247, 0.12);
}

/* Checkboxes and radios */
.form-check-input,
input[type="checkbox"],
input[type="radio"] {
  margin-top: 0.2rem;
}

/* Form labels */
.form-label,
label {
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* Text muted - override Bootstrap */
.text-muted {
  color: var(--color-text-muted) !important;
}

/* Links */
a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* ===== Form Elements - Dark Mode ──────────────────────── */
[data-theme="dark"] {
  /* Input fields */
  --input-bg: var(--color-form-bg);
  --input-border: var(--color-form-border);
  --input-text: var(--color-form-text);
  --input-placeholder: var(--color-text-muted);
  
  /* Buttons */
  --btn-default-bg: var(--color-surface);
  --btn-default-border: var(--color-border);
  --btn-default-text: var(--color-text-secondary);
}

[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="email"],
[data-theme="dark"] input[type="password"],
[data-theme="dark"] input[type="number"],
[data-theme="dark"] input[type="tel"],
[data-theme="dark"] input[type="url"],
[data-theme="dark"] input[type="search"],
[data-theme="dark"] input[type="datetime-local"],
[data-theme="dark"] input[type="date"],
[data-theme="dark"] input[type="time"],
[data-theme="dark"] textarea,
[data-theme="dark"] select,
[data-theme="dark"] .form-control {
  background-color: var(--input-bg);
  border-color: var(--input-border);
  color: var(--input-text);
}

[data-theme="dark"] ::placeholder {
  color: var(--input-placeholder);
}

[data-theme="dark"] select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23aaa' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
}

[data-theme="dark"] .btn-primary,
[data-theme="dark"] button.btn-primary,
[data-theme="dark"] input[type="submit"].btn-primary {
  background-color: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

[data-theme="dark"] .btn-primary:hover,
[data-theme="dark"] button.btn-primary:hover,
[data-theme="dark"] input[type="submit"].btn-primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: #fff;
}

[data-theme="dark"] .btn-outline-primary,
[data-theme="dark"] button.btn-outline-primary {
  background-color: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-secondary);
}

[data-theme="dark"] .btn-outline-primary:hover,
[data-theme="dark"] button.btn-outline-primary:hover {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

[data-theme="dark"] .btn-secondary,
[data-theme="dark"] button.btn-secondary {
  background-color: var(--color-surface-light);
  border-color: var(--color-border);
  color: var(--color-text-secondary);
}

[data-theme="dark"] .btn-secondary:hover,
[data-theme="dark"] button.btn-secondary:hover {
  background-color: var(--color-surface-raised);
  color: var(--color-text-primary);
}

[data-theme="dark"] .btn-danger,
[data-theme="dark"] button.btn-danger {
  background-color: var(--color-danger);
  border-color: var(--color-danger);
  color: #fff;
}

[data-theme="dark"] .btn-danger:hover,
[data-theme="dark"] button.btn-danger:hover {
  background-color: var(--color-danger);
  border-color: var(--color-danger);
  color: #fff;
  opacity: 0.9;
}

[data-theme="dark"] .form-control:focus {
  background-color: var(--color-surface);
  border-color: var(--color-primary);
  color: var(--color-text-primary);
  box-shadow: 0 0 0 3px rgba(71, 126, 247, 0.25);
}

/* Body and page background */
body {
  background-color: var(--color-background);
  color: var(--color-text-primary);
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

.app-layout,
.app-layout .main-content {
  background-color: var(--color-background);
  color: var(--color-text-primary);
}

/* Topbar styling */
.app-layout .topbar {
  background-color: var(--color-surface) !important;
  border-bottom: 1px solid var(--color-border) !important;
}

[data-theme="dark"] .app-layout .topbar {
  background-color: var(--color-surface) !important;
}

/* Dropdown menus */
.dropdown-menu {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
}

[data-theme="dark"] .dropdown-menu {
  background-color: var(--color-surface);
  border-color: var(--color-border);
}

.dropdown-item {
  color: var(--color-text-secondary);
}

[data-theme="dark"] .dropdown-item {
  color: var(--color-text-secondary);
}

.dropdown-item:hover {
  background-color: var(--color-surface-light);
  color: var(--color-text-primary);
}

[data-theme="dark"] .dropdown-item:hover {
  background-color: var(--color-surface-light);
  color: var(--color-text-primary);
}

/* Alerts */
.alert {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.alert-success {
  background-color: rgba(16, 185, 129, 0.1);
  border-color: var(--color-success);
  color: var(--color-success);
}

.alert-danger {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: var(--color-danger);
  color: var(--color-danger);
}

.alert-warning {
  background-color: rgba(245, 158, 11, 0.1);
  border-color: var(--color-warning);
  color: var(--color-warning);
}

.alert-info {
  background-color: rgba(6, 182, 212, 0.1);
  border-color: var(--color-info);
  color: var(--color-info);
}

[data-theme="dark"] .alert-success {
  background-color: rgba(16, 185, 129, 0.15);
  border-color: var(--color-success);
  color: var(--color-success);
}

[data-theme="dark"] .alert-danger {
  background-color: rgba(239, 68, 68, 0.15);
  border-color: var(--color-danger);
  color: var(--color-danger);
}

[data-theme="dark"] .alert-warning {
  background-color: rgba(245, 158, 11, 0.15);
  border-color: var(--color-warning);
  color: var(--color-warning);
}

[data-theme="dark"] .alert-info {
  background-color: rgba(6, 182, 212, 0.15);
  border-color: var(--color-info);
  color: var(--color-info);
}

/* Utility: monospace numbers */
.mono {
  font-family: var(--font-family-mono);
  font-variant-numeric: tabular-nums;
}

/* ===== Global Transition for Smooth Theme Switching ===== */
* {
  transition: background-color var(--transition-slow), 
              border-color var(--transition-normal), 
              color var(--transition-slow),
              box-shadow var(--transition-normal) !important;
  transition-delay: 0s !important;
}

/* Disable transition on page load to prevent flash */
.no-transition * {
  transition: none !important;
}