/* ============================================================================
   AERIUM - Main Stylesheet
   No global element styles - Everything is class-based
   ============================================================================ */

/* ============================================================================
   CSS VARIABLES - The only "global" part
   ============================================================================ */
:root {
    /* Force light color scheme for native form controls */
    color-scheme: light;

    /* Colors - Light Modern Theme (Default) */
    --color-bg: #ffffff;
    --color-surface: #f8fafc;
    --color-surface-hover: #f1f5f9;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    --color-text-primary: var(--color-text);
    --color-background: var(--color-surface);
    --color-primary-dark: var(--color-primary-hover);

    /* Input and Card Backgrounds */
    --color-card-bg: #ffffff;
    --color-input-bg: #ffffff;
    --color-input-text: #1e293b;

    /* Tinted Backgrounds for Icons */
    --color-primary-bg: #eff6ff;
    --color-success-bg: #f0fdf4;
    --color-warning-bg: #fffbeb;
    --color-info-bg: #f0fdfa;
    --color-danger-bg: #fef2f2;
    --color-teal-bg: #f0fdfa;
    --color-cyan-bg: #ecfeff;
    --color-purple-bg: #f5f3ff;
    --color-pink-bg: #fdf2f8;
    --color-lime-bg: #f7fee7;
    --color-amber-bg: #fffbeb;
    --color-brown-bg: #fef3c7;
    --color-gray-bg: #f9fafb;

    /* Client Header */
    --client-header-gradient: linear-gradient(135deg, #2c5282 0%, #2d3748 100%);
    --client-header-text: #ffffff;

    /* Brand Colors - Professional Blues */
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #06b6d4;

    /* Secondary button colors */
    --color-secondary: #6b7280;
    --color-secondary-hover: #4b5563;
    --color-secondary-bg: #f3f4f6;

    /* Leave button colors */
    --color-leave: #2196F3;
    --color-leave-hover: #1976D2;
    --color-leave-gradient-start: #42A5F5;
    --color-leave-gradient-end: #1E88E5;

    /* Accent colors (for leave types, badges, etc.) */
    --color-teal: #14b8a6;
    --color-cyan: #0ea5e9;
    --color-purple: #8b5cf6;
    --color-pink: #ec4899;
    --color-lime: #84cc16;
    --color-amber: #f59e0b;
    --color-brown: #b45309;
    --color-gray: #6b7280;
    --color-gray-light: #9ca3af;

    /* Borders */
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;

    /* Solid colors instead of gradients for professional look */
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #3b82f6 100%);
    --gradient-success: linear-gradient(135deg, #22c55e 0%, #22c55e 100%);
    --gradient-warning: linear-gradient(135deg, #f59e0b 0%, #f59e0b 100%);
    --gradient-info: linear-gradient(135deg, #06b6d4 0%, #06b6d4 100%);

    /* Spacing Scale
       --spacing-xs:  0.25rem (4px)
       --spacing-sm:  0.5rem  (8px)
       --spacing-md:  1rem    (16px)
       --spacing-lg:  1rem    (16px) - same as md, use for semantic grouping
       --spacing-xl:  1.5rem  (24px)
       --spacing-2xl: 3rem    (48px)
       --spacing-3xl: 4rem    (64px)
       --spacing-4xl: 6rem    (96px)
    */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Typography Scale
       --font-size-2xs:  0.625rem (10px) - Badges, tiny labels
       --font-size-xxs:  0.7rem   (11px) - Compact event text, mobile
       --font-size-xs:   0.75rem  (12px) - Small labels, captions
       --font-size-sm:   0.875rem (14px) - Secondary text, descriptions
       --font-size-base: 0.9rem   (14.4px) - Body text
       --font-size-md:   1rem     (16px) - Standard text
       --font-size-lg:   1.125rem (18px) - Emphasis, subheadings
       --font-size-xl:   1.25rem  (20px) - Section headings
       --font-size-2xl:  1.5rem   (24px) - Page titles
       --font-size-3xl:  2rem     (32px) - Large display text
    */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-2xs: 0.625rem;
    --font-size-xxs: 0.7rem;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 0.9rem;
    --font-size-md: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    /* Component-Specific Font Sizes */
    --font-size-data-grid-header: var(--font-size-xs);
    --font-size-data-grid-cell: 0.8125rem;
    --font-size-data-grid-badge: var(--font-size-2xs);

    /* Layout */
    --app-min-width: 1100px;
    --sidebar-width: 180px;
    --header-height: 60px;
    --sidebar-header-height: 73px; /* Sidebar header height (logo section) */
    --sidebar-collapsed-width: 64px;
    --sidebar-width-responsive: 90px;
    --sidebar-nav-item-height: 60px;

    /* Overscroll Behavior - Customizable per theme */
    --overscroll-behavior-x: contain;

    /* Shadows - Semantic naming for cleaner code */
    --shadow-subtle: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-default: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-elevated: 0 10px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-overlay: 0 20px 50px -10px rgb(0 0 0 / 0.15), 0 10px 20px -5px rgb(0 0 0 / 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;

    /* Border Radius Scale */
    --radius-xs: 0.125rem;
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-full: 9999px;

    /* ============================================================================
       Z-INDEX SCALE - Documented layering system
       ============================================================================ */
    /* Base layers (1-10) */
    --z-base: 1;
    /* Base layer for positioned elements */
    --z-dropdown-trigger: 4;
    /* Dropdown triggers */
    --z-sticky: 5;
    /* Sticky elements like table headers */
    --z-sticky-cell: 8;
    /* Sticky table cells */
    --z-dropdown: 10;
    /* Dropdown menus */
    --z-sticky-header: 15;
    /* Sticky column headers */

    /* Mid layers (100-999) */
    --z-popover: 100;
    /* Popovers, tooltips */
    --z-navbar: 998;
    /* Navigation bars */
    --z-sidebar: 999;
    /* Sidebars */
    --z-header: 1000;
    /* Headers and main navigation */
    --z-sidebar-backdrop: 1001;
    /* Sidebar backdrop overlay */
    --z-sidebar-panel: 1002;
    /* Sidebar panel when open */

    /* High layers (1000-9999) */
    --z-modal-backdrop: 1000;
    /* Modal backdrop */
    --z-modal: 1000;
    /* Modal content */
    --z-loader: 1200;
    /* Loading overlays */
    --z-dropdown-in-modal: 2000;
    /* Dropdowns within modals */

    /* Critical layers (9999+) */
    --z-notification: 9999;
    /* Notifications and toasts */
    --z-modal-high: 10000;
    /* High priority modals */
    --z-modal-critical: 10001;
    /* Critical modals (errors, alerts) */
    --z-max: 99999;
    /* Maximum z-index for inline critical overrides */

    /* Client View Specific */
    --client-header-height: 70px;
    --tab-height: 48px;

    /* Dashboard Specific */
    --dashboard-metric-primary: var(--color-primary);
    --dashboard-metric-danger: var(--color-danger);
    --dashboard-metric-success: var(--color-success);
    --dashboard-metric-info: var(--color-info);
    --dashboard-activity-bg: var(--color-surface);
    --dashboard-hover-bg: var(--color-surface-hover);
    --dashboard-stat-bg: var(--color-surface);
    --dashboard-refresh-icon: var(--color-text-secondary);
    --dashboard-last-updated: var(--color-text-muted);

    /* Extended palette + legacy compatibility tokens */
    --color-bg-light: var(--color-surface);
    --color-bg-secondary: var(--color-card-bg);
    --color-bg-hover: var(--color-surface-hover);
    --color-bg-dark: var(--color-border);
    --color-background-secondary: var(--color-bg-secondary);
    --color-background-hover: var(--color-bg-hover);
    --color-surface-alt: var(--color-card-bg);

    --bg-light: var(--color-bg-light);
    --bg-secondary: var(--color-bg-secondary);
    --bg-hover: var(--color-bg-hover);

    --border-color: var(--color-border);
    --border-light: var(--color-border-light);
    --border-radius: var(--radius-md);
    --color-border-dark: var(--color-border);

    --color-primary-light: var(--color-primary-bg);
    --color-primary-soft: var(--color-primary-bg);
    --color-primary-rgb: 59, 130, 246;
    --color-success-hover: var(--color-success);
    --color-success-light: var(--color-success-bg);
    --color-success-dark: #16a34a;
    --color-success-rgb: 34, 197, 94;
    --color-warning-light: var(--color-warning-bg);
    --color-warning-dark: #d97706;
    --color-warning-rgb: 245, 158, 11;
    --color-warning-text: #92400e;
    --color-warning-text-light: #a16207;
    --color-warning-text-dark: #78350f;
    --color-warning-border: #fde68a;
    --color-warning-gradient-start: #fef3c7;
    --color-warning-gradient-end: #fde68a;
    --color-danger-bg: rgba(239, 68, 68, 0.12);
    --color-danger-light: var(--color-danger-bg);
    --color-text-tertiary: var(--color-text-muted);
    --color-error: var(--color-danger);

    --danger-color: var(--color-danger);
    --success-color: var(--color-success);
    --primary: var(--color-primary);
    --primary-color: var(--color-primary);
    --primary-dark: var(--color-primary-hover);
    --primary-light: var(--color-primary-light);

    --text-primary: var(--color-text-primary);
    --text-secondary: var(--color-text-secondary);
    --dashboard-metric-warning: var(--color-warning);

    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-mono: 'SFMono-Regular', Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;

    --radius-base: var(--radius-md);

    --shadow-xs: 0 1px 2px 0 rgb(15 23 42 / 0.04), 0 1px 1px -1px rgb(15 23 42 / 0.08);

    --transition-normal: var(--transition-base);

    --white: #ffffff;

    /* ============================================================================
       SEMANTIC COLOR VARIABLES - Component-level theming
       These provide flexibility for themes to customize text on colored backgrounds
       ============================================================================ */

    /* Text on colored backgrounds ("On" colors) */
    --color-on-primary: #ffffff;
    --color-on-success: #ffffff;
    --color-on-warning: #1e293b;
    --color-on-danger: #ffffff;
    --color-on-info: #ffffff;

    /* Link colors */
    --color-link: var(--color-primary);
    --color-link-hover: var(--color-primary-hover);

    /* Focus states */
    --color-focus-ring: var(--color-primary);

    /* Disabled states */
    --color-disabled-text: var(--color-text-muted);
    --color-disabled-bg: var(--color-surface);

    /* Table/Grid */
    --color-table-header-bg: var(--color-surface);
    --color-table-header-text: var(--color-text-secondary);
    --color-table-row-hover: var(--color-surface-hover);
    --color-row-alt: rgba(0, 0, 0, 0.02);
    --color-status-badge-bg: rgba(59, 130, 246, 0.08);

    /* Skeleton Loading */
    --color-skeleton: #e2e8f0;
    --color-skeleton-highlight: #f1f5f9;

    /* Modal */
    --color-modal-bg: var(--color-card-bg);
    --color-modal-text: var(--color-text);
    --color-modal-overlay: rgba(15, 23, 42, 0.5);

    /* Notification */
    --color-notification-bg: #ffffff;
    --color-notification-text: var(--color-text);
    --color-notification-border: var(--color-border);

    /* Transparency variants for glassmorphism */
    --color-overlay-light: rgba(255, 255, 255, 0.1);
    --color-overlay-medium: rgba(255, 255, 255, 0.2);

    /* Tab Component */
    --color-tab-bg: transparent;
    --color-tab-text: var(--color-text-secondary);
    --color-tab-hover-bg: var(--color-surface);
    --color-tab-hover-text: var(--color-text);
    --color-tab-active-bg: var(--color-primary);
    --color-tab-active-text: var(--color-on-primary);
    --color-tab-border: var(--color-border);

    /* Card Compact */
    --color-card-hover-border: var(--color-primary);
    --color-card-pinned-border: var(--color-primary);

}

/* Dark Theme */
[data-theme="dark"] {
    color-scheme: dark;
    --color-primary-rgb: 96, 165, 250;

    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-surface-hover: #334155;
    --color-text: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #64748b;
    --color-text-primary: var(--color-text);
    --color-background: var(--color-surface);
    --color-primary-dark: var(--color-primary);
    --color-primary: #60a5fa;
    --color-primary-hover: #3b82f6;
    --color-border: #334155;
    --color-border-light: #1e293b;
    --gradient-primary: linear-gradient(135deg, #60a5fa 0%, #60a5fa 100%);

    /* Input and Card Backgrounds */
    --color-card-bg: #1e293b;
    --color-input-bg: #0f172a;
    --color-input-text: #f1f5f9;

    /* Tinted Backgrounds for Icons */
    --color-primary-bg: rgba(96, 165, 250, 0.1);
    --color-success-bg: rgba(34, 197, 94, 0.1);
    --color-warning-bg: rgba(245, 158, 11, 0.1);
    --color-info-bg: rgba(6, 182, 212, 0.1);
    --color-danger-bg: rgba(239, 68, 68, 0.1);
    --color-teal-bg: rgba(45, 212, 191, 0.1);
    --color-cyan-bg: rgba(56, 189, 248, 0.1);
    --color-purple-bg: rgba(167, 139, 250, 0.1);
    --color-pink-bg: rgba(244, 114, 182, 0.1);
    --color-lime-bg: rgba(163, 230, 53, 0.1);
    --color-amber-bg: rgba(251, 191, 36, 0.1);
    --color-brown-bg: rgba(217, 119, 6, 0.1);
    --color-gray-bg: rgba(156, 163, 175, 0.1);

    /* Client Header */
    --client-header-gradient: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    --client-header-text: #f1f5f9;

    /* Info and secondary colors for dark theme */
    --color-info: #3abff8;
    --color-secondary: #475569;
    --color-secondary-hover: #64748b;
    --color-secondary-bg: rgba(71, 85, 105, 0.2);

    /* Leave button colors */
    --color-leave: #64B5F6;
    --color-leave-hover: #42A5F5;
    --color-leave-gradient-start: #90CAF9;
    --color-leave-gradient-end: #42A5F5;

    /* Accent colors - Dark (brighter versions) */
    --color-teal: #2dd4bf;
    --color-cyan: #38bdf8;
    --color-purple: #a78bfa;
    --color-pink: #f472b6;
    --color-lime: #a3e635;
    --color-amber: #fbbf24;
    --color-brown: #d97706;
    --color-gray: #9ca3af;
    --color-gray-light: #d1d5db;

    /* Dashboard Specific */
    --dashboard-metric-primary: var(--color-primary);
    --dashboard-metric-danger: #f87171;
    --dashboard-metric-success: #4ade80;
    --dashboard-metric-info: var(--color-info);
    --dashboard-activity-bg: rgba(30, 41, 59, 0.5);
    --dashboard-hover-bg: var(--color-surface-hover);
    --dashboard-stat-bg: rgba(30, 41, 59, 0.3);
    --dashboard-refresh-icon: var(--color-text-secondary);
    --dashboard-last-updated: var(--color-text-muted);

    /* Semantic overrides for dark theme */
    --color-on-primary: #f1f5f9;
    --color-on-success: #f0fdf4;
    --color-on-warning: #1e293b;
    --color-on-danger: #fef2f2;
    --color-on-info: #f0fdfa;
    --color-link: #60a5fa;

    /* Warning/Amber colors for dark theme */
    --color-success-dark: #16a34a;
    --color-success-rgb: 34, 197, 94;
    --color-warning-dark: #d97706;
    --color-warning-rgb: 245, 158, 11;
    --color-warning-text: #fef3c7;
    --color-warning-text-light: #fcd34d;
    --color-warning-text-dark: #fcd34d;
    --color-warning-border: #78350f;
    --color-warning-gradient-start: #422006;
    --color-warning-gradient-end: #78350f;
    --color-notification-bg: #1e293b;
    --color-notification-text: #f1f5f9;
    --color-notification-border: #334155;
    --color-modal-overlay: rgba(0, 0, 0, 0.7);
    --color-overlay-light: rgba(241, 245, 249, 0.05);
    --color-overlay-medium: rgba(241, 245, 249, 0.1);

    /* Tab Component - Dark */
    --color-tab-hover-bg: var(--color-surface-hover);
    --color-tab-active-bg: var(--color-primary);
    --color-tab-active-text: #0f172a;

    /* Table/Grid - Dark */
    --color-row-alt: rgba(255, 255, 255, 0.025);
    --color-status-badge-bg: rgba(96, 165, 250, 0.15);

    /* Skeleton Loading - Dark */
    --color-skeleton: #334155;
    --color-skeleton-highlight: #475569;
}

/* Sage Green Theme */
[data-theme="sage"] {
    --color-primary-rgb: 127, 181, 142;

    --color-bg: #ECF3EE;
    /* pale sage wash */
    --color-surface: #F7FBF9;
    /* soft green-tinted surface */
    --color-surface-hover: #E2ECE6;
    /* deeper sage on hover */

    --color-text: #0F1A14;
    /* deep green-black for strong contrast */
    --color-text-secondary: #2F4A3C;
    /* dark sage */
    --color-text-muted: #6D8478;
    --color-text-primary: var(--color-text);
    --color-background: var(--color-surface);
    --color-primary-dark: var(--color-primary-hover);
    /* muted sage/grey */

    --color-primary: #7FB58E;
    /* true sage green */
    --color-primary-hover: #6AA37C;
    /* a bit deeper on hover */

    --color-border: #C9DED3;
    /* light sage border */
    --color-border-light: #EAF2ED;
    /* extra light sage */

    --gradient-primary: linear-gradient(135deg, #7FB58E 0%, #6AA37C 100%);

    /* Input and Card Backgrounds */
    --color-card-bg: #F7FBF9;
    --color-input-bg: #FFFFFF;
    --color-input-text: #0F1A14;

    /* Tinted Backgrounds for Icons */
    --color-primary-bg: #E8F3EC;
    --color-success-bg: #E8F5E8;
    --color-warning-bg: #FFF9F0;
    --color-info-bg: #EAF7F5;

    /* Client Header */
    --client-header-gradient: linear-gradient(135deg, #6AA37C 0%, #5A8D6B 100%);
    --client-header-text: #ffffff;

    /* Info and secondary colors for sage theme */
    --color-info: #22d3ee;
    --color-secondary: #78716c;
    --color-secondary-hover: #57534e;
    --color-secondary-bg: #f5f5f4;

    /* Leave button colors */
    --color-leave: #10B981;
    --color-leave-hover: #059669;
    --color-leave-gradient-start: #34D399;
    --color-leave-gradient-end: #059669;

    /* Dashboard Specific */
    --dashboard-metric-primary: var(--color-primary);
    --dashboard-metric-danger: #dc2626;
    --dashboard-metric-success: #65a30d;
    --dashboard-metric-info: var(--color-info);
    --dashboard-activity-bg: rgba(231, 243, 236, 0.5);
    --dashboard-hover-bg: var(--color-surface-hover);
    --dashboard-stat-bg: rgba(231, 243, 236, 0.3);
    --dashboard-refresh-icon: var(--color-text-secondary);
    --dashboard-last-updated: var(--color-text-muted);

    /* Semantic overrides for sage theme */
    --color-on-primary: #ffffff;
    --color-link: #6AA37C;
    --color-notification-bg: #F7FBF9;
    --color-notification-text: #0F1A14;
    --color-notification-border: #C9DED3;
    --color-overlay-light: rgba(127, 181, 142, 0.05);
    --color-overlay-medium: rgba(127, 181, 142, 0.1);

    /* Tab Component - Sage */
    --color-tab-active-bg: #7FB58E;
    --color-tab-active-text: #ffffff;

    /* Table/Grid - Sage */
    --color-row-alt: rgba(0, 0, 0, 0.025);
    --color-status-badge-bg: rgba(127, 181, 142, 0.12);

    /* Skeleton Loading - Sage */
    --color-skeleton: #C9DED3;
    --color-skeleton-highlight: #E2ECE6;
}

:root {
    --modal-backdrop: rgba(15, 23, 42, 0.5);
}

/* ============================================================================
   BASE RESET
   ============================================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    min-width: var(--app-min-width);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color var(--transition-base), color var(--transition-base);
    display: flex;
    min-height: 100vh;
    overflow-x: auto;
    overscroll-behavior-x: var(--overscroll-behavior-x, contain);
}

/* ============================================================================
   LAYOUT UTILITIES
   ============================================================================ */
.layout-min-width {
    min-width: var(--app-min-width);
}

/* ============================================================================
   SCROLLBAR STYLING
   ============================================================================ */
.scrollbar-horizontal {
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) var(--color-surface);
}

.scrollbar-horizontal::-webkit-scrollbar {
    height: 12px;
    width: 12px;
}

.scrollbar-horizontal::-webkit-scrollbar-track {
    background: var(--color-surface);
    border-radius: var(--radius-sm);
}

.scrollbar-horizontal::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-sm);
    border: 2px solid var(--color-surface);
}

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

.scrollbar-horizontal::-webkit-scrollbar-corner {
    background: var(--color-surface);
}

/* ============================================================================
   APP STATES - Loading, Error, Empty
   ============================================================================ */
.app__loading {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-secondary);
    background-color: var(--color-bg);
    z-index: var(--z-loader);
}

.app__loading-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.app__loading-text {
    font-size: var(--font-size-base);
}

.app__error {
    text-align: center;
    padding: var(--spacing-2xl);
}

.app__error-icon {
    font-size: 3rem;
    color: var(--color-danger);
    margin-bottom: var(--spacing-lg);
}

.app__error-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.app__error-message {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

.app__empty {
    text-align: center;
    padding: var(--spacing-2xl);
}

.app__empty-icon {
    font-size: 3rem;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
}

.app__empty-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.app__empty-message {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ============================================================================
   BUTTON COMPONENT
   ============================================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.1);
}

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

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

.btn--secondary {
    background: var(--color-secondary-bg);
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn--secondary:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-border-light);
}

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

.btn--danger:hover {
    background: var(--color-danger);
    opacity: 0.9;
}

.btn--ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border-color: transparent;
}

.btn--ghost:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
}

.btn--sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
}

.btn--lg {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-base);
}

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

/* ============================================================================
   FORM CONTROLS
   ============================================================================ */
.form-control {
    width: 100%;
    padding: var(--spacing-sm);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-input-bg);
    color: var(--color-input-text);
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(var(--color-primary-rgb), 0.1);
}

.form-control:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--color-surface);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-helper {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--spacing-xs);
}

.form-error {
    font-size: var(--font-size-xs);
    color: var(--color-danger);
    margin-top: var(--spacing-xs);
}

/* ============================================================================
   TEXT UTILITIES
   ============================================================================ */
.text-muted {
    color: var(--color-text-muted);
}

/* ============================================================================
   VISIBILITY UTILITIES
   ============================================================================ */
.hidden {
    display: none;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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