/* ============================================
   MAIN.CSS - Complete Design System
   Personnel Leave Tracking System
   ============================================ */

/* ============================================
   CSS VARIABLES & THEMES
   ============================================ */

:root {
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

[data-theme='dark'] {
    --bg-primary: #0f0f17;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --bg-card: rgba(26, 26, 46, 0.8);
    --bg-glass: rgba(26, 26, 46, 0.6);
    --border-color: rgba(108, 99, 255, 0.15);
    --border-glow: rgba(108, 99, 255, 0.3);
    --text-primary: #e8e8f0;
    --text-secondary: #a0a0b8;
    --text-muted: #6b6b80;
    --accent-primary: #6c63ff;
    --accent-secondary: #00d2ff;
    --accent-gradient: linear-gradient(135deg, #6c63ff, #00d2ff);
    --success: #00e676;
    --warning: #ffab00;
    --error: #ff5252;
    --info: #448aff;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(108, 99, 255, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

[data-theme='black'] {
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #111111;
    --bg-card: rgba(15, 15, 15, 0.9);
    --bg-glass: rgba(10, 10, 10, 0.7);
    --border-color: rgba(108, 99, 255, 0.1);
    --border-glow: rgba(108, 99, 255, 0.25);
    --text-primary: #e8e8f0;
    --text-secondary: #a0a0b8;
    --text-muted: #6b6b80;
    --accent-primary: #6c63ff;
    --accent-secondary: #00d2ff;
    --accent-gradient: linear-gradient(135deg, #6c63ff, #00d2ff);
    --success: #00e676;
    --warning: #ffab00;
    --error: #ff5252;
    --info: #448aff;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.7);
    --shadow-glow: 0 0 20px rgba(108, 99, 255, 0.1);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

[data-theme='system'] {
    --bg-primary: #0f0f17;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #16213e;
    --bg-card: rgba(26, 26, 46, 0.8);
    --bg-glass: rgba(26, 26, 46, 0.6);
    --border-color: rgba(108, 99, 255, 0.15);
    --border-glow: rgba(108, 99, 255, 0.3);
    --text-primary: #e8e8f0;
    --text-secondary: #a0a0b8;
    --text-muted: #6b6b80;
    --accent-primary: #6c63ff;
    --accent-secondary: #00d2ff;
    --accent-gradient: linear-gradient(135deg, #6c63ff, #00d2ff);
    --success: #00e676;
    --warning: #ffab00;
    --error: #ff5252;
    --info: #448aff;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(108, 99, 255, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

@media (prefers-color-scheme: dark) {
    [data-theme='system'] {
        --bg-primary: #0f0f17;
        --bg-secondary: #1a1a2e;
        --bg-tertiary: #16213e;
        --bg-card: rgba(26, 26, 46, 0.8);
        --bg-glass: rgba(26, 26, 46, 0.6);
        --border-color: rgba(108, 99, 255, 0.15);
        --border-glow: rgba(108, 99, 255, 0.3);
        --text-primary: #e8e8f0;
        --text-secondary: #a0a0b8;
        --text-muted: #6b6b80;
        --accent-primary: #6c63ff;
        --accent-secondary: #00d2ff;
        --accent-gradient: linear-gradient(135deg, #6c63ff, #00d2ff);
        --success: #00e676;
        --warning: #ffab00;
        --error: #ff5252;
        --info: #448aff;
        --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
        --shadow-glow: 0 0 20px rgba(108, 99, 255, 0.15);
    }
}

@media (prefers-color-scheme: light) {
    [data-theme='system'] {
        --bg-primary: #0f0f17;
        --bg-secondary: #1a1a2e;
        --bg-tertiary: #16213e;
        --bg-card: rgba(26, 26, 46, 0.8);
        --bg-glass: rgba(26, 26, 46, 0.6);
        --border-color: rgba(108, 99, 255, 0.15);
        --border-glow: rgba(108, 99, 255, 0.3);
        --text-primary: #e8e8f0;
        --text-secondary: #a0a0b8;
        --text-muted: #6b6b80;
        --accent-primary: #6c63ff;
        --accent-secondary: #00d2ff;
        --accent-gradient: linear-gradient(135deg, #6c63ff, #00d2ff);
        --success: #00e676;
        --warning: #ffab00;
        --error: #ff5252;
        --info: #448aff;
        --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
        --shadow-glow: 0 0 20px rgba(108, 99, 255, 0.15);
    }
}

/* ============================================
   GLOBAL STYLES
   ============================================ */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

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

::-webkit-scrollbar-thumb:hover {
    background: var(--border-glow);
}

/* Firefox scrollbar */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) var(--bg-primary);
}

/* Selection */
::selection {
    background: var(--accent-primary);
    color: #ffffff;
}

::-moz-selection {
    background: var(--accent-primary);
    color: #ffffff;
}

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

a:hover {
    color: var(--accent-secondary);
}

/* Images */
img {
    max-width: 100%;
    display: block;
}

/* App Container */
#app {
    min-height: 100vh;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    font-family: var(--font-family);
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1.5;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
    outline: none;
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: var(--accent-gradient);
    color: #ffffff;
    border: none;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    box-shadow: var(--shadow-md), var(--shadow-glow);
    transform: translateY(-1px);
}

.btn-secondary {
    background: var(--bg-glass);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    border-color: var(--border-glow);
    background: var(--bg-card);
    box-shadow: var(--shadow-glow);
}

.btn-danger {
    background: var(--error);
    color: #ffffff;
    border: none;
}

.btn-danger:hover {
    background: #ff6b6b;
    box-shadow: 0 0 20px rgba(255, 82, 82, 0.3);
    transform: translateY(-1px);
}

.btn-success {
    background: var(--success);
    color: #0f0f17;
    border: none;
    font-weight: 600;
}

.btn-success:hover {
    background: #33eb91;
    box-shadow: 0 0 20px rgba(0, 230, 118, 0.3);
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: none;
}

.btn-ghost:hover {
    color: var(--text-primary);
    background: var(--bg-glass);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-sm);
}

.btn-xs {
    padding: 4px 8px;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    height: auto;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

/* ============================================
   CARDS
   ============================================ */

.card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow);
}

/* ============================================
   FORMS
   ============================================ */

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.input {
    width: 100%;
    padding: 12px 16px;
    font-family: var(--font-family);
    font-size: 0.875rem;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    transition: all var(--transition-normal);
}

.input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.15);
}

.input::placeholder {
    color: var(--text-muted);
}

.select {
    width: 100%;
    padding: 12px 40px 12px 16px;
    font-family: var(--font-family);
    font-size: 0.875rem;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a0a0b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 18px;
}

.select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.15);
}

.textarea {
    width: 100%;
    padding: 12px 16px;
    font-family: var(--font-family);
    font-size: 0.875rem;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    outline: none;
    resize: vertical;
    min-height: 100px;
    transition: all var(--transition-normal);
}

.textarea:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.15);
}

.textarea::placeholder {
    color: var(--text-muted);
}

.input-icon-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 14px;
    width: 18px;
    height: 18px;
    color: var(--text-muted);
    font-size: 1rem;
    pointer-events: none;
}

.input-icon-wrapper .input {
    padding-left: 42px;
}

/* ============================================
   BADGES
   ============================================ */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 100px;
    line-height: 1.4;
    white-space: nowrap;
}

.badge-success {
    background: rgba(0, 230, 118, 0.15);
    color: var(--success);
}

.badge-warning {
    background: rgba(255, 171, 0, 0.15);
    color: var(--warning);
}

.badge-error {
    background: rgba(255, 82, 82, 0.15);
    color: var(--error);
}

.badge-info {
    background: rgba(68, 138, 255, 0.15);
    color: var(--info);
}

.badge-primary {
    background: rgba(108, 99, 255, 0.15);
    color: var(--accent-primary);
}

/* ============================================
   AVATARS
   ============================================ */

.avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    flex-shrink: 0;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-lg {
    width: 64px;
    height: 64px;
}

.avatar-sm {
    width: 32px;
    height: 32px;
}

/* ============================================
   MODALS
   ============================================ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    animation: fadeIn var(--transition-normal) ease;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    max-width: 520px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    animation: slideUp var(--transition-normal) ease;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-body {
    padding: 24px;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
}

/* ============================================
   TOASTS
   ============================================ */

.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 400px;
}

.toast {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px 20px;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    animation: slideLeft var(--transition-normal) ease;
    position: relative;
    overflow: hidden;
}

.toast-success {
    border-left: 4px solid var(--success);
}

.toast-error {
    border-left: 4px solid var(--error);
}

.toast-warning {
    border-left: 4px solid var(--warning);
}

.toast-info {
    border-left: 4px solid var(--info);
}

.toast-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
    line-height: 1;
}

.toast-success .toast-icon {
    color: var(--success);
}

.toast-error .toast-icon {
    color: var(--error);
}

.toast-warning .toast-icon {
    color: var(--warning);
}

.toast-info .toast-icon {
    color: var(--info);
}

.toast-message {
    flex: 1;
    font-size: 0.875rem;
    color: var(--text-primary);
    line-height: 1.5;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1.125rem;
    padding: 0;
    line-height: 1;
    flex-shrink: 0;
    transition: color var(--transition-fast);
}

.toast-close:hover {
    color: var(--text-primary);
}

.toast-exit {
    animation: slideRight var(--transition-normal) ease forwards;
}

/* ============================================
   TABLES
   ============================================ */

.table-container {
    width: 100%;
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.table {
    width: 100%;
    border-collapse: collapse;
}

.table thead {
    background: var(--bg-tertiary);
}

.table th {
    padding: 14px 16px;
    text-align: left;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.table td {
    padding: 14px 16px;
    font-size: 0.875rem;
    color: var(--text-primary);
    border-bottom: 1px solid rgba(108, 99, 255, 0.05);
    vertical-align: middle;
}

.table tbody tr {
    transition: background var(--transition-fast);
}

.table tbody tr:hover {
    background: rgba(108, 99, 255, 0.05);
}

.table tbody tr:last-child td {
    border-bottom: none;
}

/* ============================================
   STAT CARDS
   ============================================ */

.stat-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    position: relative;
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: default;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md), var(--shadow-glow);
    border-color: var(--border-glow);
}

.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    background: rgba(108, 99, 255, 0.1);
    color: var(--accent-primary);
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    margin-bottom: 4px;
}

.stat-card .stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* ============================================
   SWITCH / TOGGLE
   ============================================ */

.switch {
    position: relative;
    display: inline-block;
    width: 48px;
    height: 26px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.switch-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 26px;
    transition: all var(--transition-normal);
}

.switch-slider::before {
    content: '';
    position: absolute;
    height: 20px;
    width: 20px;
    left: 2px;
    bottom: 2px;
    background: var(--text-secondary);
    border-radius: 50%;
    transition: all var(--transition-normal);
}

.switch input:checked + .switch-slider {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
}

.switch input:checked + .switch-slider::before {
    transform: translateX(22px);
    background: #ffffff;
}

/* ============================================
   LOADING SPINNER
   ============================================ */

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-spinner-sm {
    width: 20px;
    height: 20px;
    border-width: 2px;
}

.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    gap: 16px;
}

.loading-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ============================================
   EMPTY STATE
   ============================================ */

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    text-align: center;
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.5;
    max-width: 80px;
    max-height: 80px;
}

.empty-icon svg {
    width: 64px;
    height: 64px;
    max-width: 64px;
    max-height: 64px;
}

.empty-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.empty-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    max-width: 400px;
    line-height: 1.6;
}

/* ============================================
   DROPDOWN
   ============================================ */

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    min-width: 200px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    padding: 6px;
    animation: slideDown var(--transition-fast) ease;
    display: none;
}

.dropdown-menu.show {
    display: block;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    font-size: 0.875rem;
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    font-family: var(--font-family);
}

.dropdown-item:hover {
    background: var(--bg-glass);
    color: var(--accent-primary);
}

.dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 6px 0;
}

/* ============================================
   THEME SWITCHER
   ============================================ */

.theme-switcher {
    display: flex;
    align-items: center;
    gap: 4px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 4px;
}

.theme-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 32px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.theme-btn:hover {
    color: var(--text-primary);
    background: var(--bg-glass);
}

.theme-btn.active {
    background: var(--accent-primary);
    color: #ffffff;
    box-shadow: var(--shadow-sm);
}

/* ============================================
   SIDEBAR
   ============================================ */

.sidebar {
    width: 260px;
    height: 100vh;
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition-normal);
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 1.125rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    font-family: var(--font-family);
    text-decoration: none;
}

.nav-item:hover {
    color: var(--text-primary);
    background: var(--bg-glass);
}

.nav-item.active {
    color: var(--accent-primary);
    background: rgba(108, 99, 255, 0.1);
    font-weight: 600;
}

.nav-icon {
    font-size: 1.125rem;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
}

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
}

/* ============================================
   ANIMATION UTILITIES
   ============================================ */

.fade-in {
    animation: fadeIn var(--transition-normal) ease;
}

.slide-up {
    animation: slideUp var(--transition-normal) ease;
}

.slide-left {
    animation: slideLeft var(--transition-normal) ease;
}

/* ============================================
   KEYFRAMES
   ============================================ */

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

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

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

@keyframes slideLeft {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideRight {
    from {
        opacity: 1;
        transform: translateX(0);
    }
    to {
        opacity: 0;
        transform: translateX(30px);
    }
}

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

@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 5px rgba(108, 99, 255, 0.2);
    }
    50% {
        box-shadow: 0 0 20px rgba(108, 99, 255, 0.4);
    }
}

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

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
    100% {
        background-position: 0% 50%;
    }
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        transform: translateX(-100%);
        grid-column: auto;
        grid-row: auto;
    }

    .sidebar.open {
        transform: translateX(0);
    }
}

@media (max-width: 768px) {
    .table-container {
        border-radius: var(--radius-sm);
    }

    .table th,
    .table td {
        padding: 10px 12px;
        font-size: 0.8125rem;
    }

    .stat-card {
        padding: 16px;
    }

    .stat-card .stat-value {
        font-size: 1.5rem;
    }

    .modal {
        max-width: 100%;
        margin: 10px;
        max-height: 85vh;
    }

    .modal-header {
        padding: 16px 20px;
    }

    .modal-body {
        padding: 20px;
    }

    .modal-footer {
        padding: 12px 20px;
    }

    .toast-container {
        top: 10px;
        right: 10px;
        left: 10px;
        max-width: 100%;
    }

    .toast {
        padding: 12px 16px;
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 8px 16px;
        font-size: 0.8125rem;
    }

    .btn-icon {
        width: 36px;
        height: 36px;
    }

    .stat-card .stat-value {
        font-size: 1.25rem;
    }

    .stat-card .stat-label {
        font-size: 0.8125rem;
    }
}