/*
 * ==============================================
 * Team Management System — Design System
 * Version: 1.0.0
 * ==============================================
 */

/* =============================================
   Google Fonts
   ============================================= */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

/* =============================================
   CSS Custom Properties (Design Tokens — Dark & Light Modes)
   ============================================= */
/* Default / Dark Theme Colors */
html:not([data-theme="light"]), [data-theme="dark"] {
    /* Primary Colors */
    --color-primary: #4f6ef7;
    --color-primary-dark: #3b5de7;
    --color-primary-light: #7b93fa;
    --color-primary-bg: rgba(79, 110, 247, 0.12);
    --color-primary-border: rgba(79, 110, 247, 0.25);

    /* Accent Colors */
    --color-success: #10b981;
    --color-success-bg: rgba(16, 185, 129, 0.12);
    --color-warning: #f59e0b;
    --color-warning-bg: rgba(245, 158, 11, 0.12);
    --color-danger: #ef4444;
    --color-danger-bg: rgba(239, 68, 68, 0.12);
    --color-info: #06b6d4;
    --color-info-bg: rgba(6, 182, 212, 0.12);
    --color-purple: #8b5cf6;
    --color-purple-bg: rgba(139, 92, 246, 0.12);

    /* Neutral Dark Theme Colors */
    --color-bg: #0f1117;
    --color-bg-secondary: #1a1d29;
    --color-bg-tertiary: #232736;
    --color-bg-card: #1e2132;
    --color-bg-hover: #282c3e;
    --color-bg-input: #1a1d29;

    --color-border: #2a2e3f;
    --color-border-light: #333750;

    --color-text-main: #e4e6f0;
    --color-text: #e4e6f0;
    --color-text-secondary: #9ca3b8;
    --color-text-muted: #6b7089;
    --color-text-white: #ffffff;
    --color-shadow: rgba(0, 0, 0, 0.4);
}

[data-theme="light"], html[data-theme="light"], body[data-theme="light"] {
    /* Primary Colors */
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-primary-light: #60a5fa;
    --color-primary-bg: rgba(59, 130, 246, 0.08);
    --color-primary-border: rgba(59, 130, 246, 0.2);

    /* Accent Colors */
    --color-success: #10b981;
    --color-success-bg: rgba(16, 185, 129, 0.08);
    --color-warning: #f59e0b;
    --color-warning-bg: rgba(245, 158, 11, 0.08);
    --color-danger: #ef4444;
    --color-danger-bg: rgba(239, 68, 68, 0.08);
    --color-info: #06b6d4;
    --color-info-bg: rgba(6, 182, 212, 0.08);
    --color-purple: #8b5cf6;
    --color-purple-bg: rgba(139, 92, 246, 0.08);

    /* Neutral Light Theme Colors */
    --color-bg: #f8fafc;
    --color-bg-secondary: #ffffff;
    --color-bg-tertiary: #f1f5f9;
    --color-bg-card: #ffffff;
    --color-bg-hover: #e2e8f0;
    --color-bg-input: #ffffff;

    --color-border: #cbd5e1;
    --color-border-light: #e2e8f0;

    --color-text-main: #0f172a;
    --color-text: #1e293b;
    --color-text-secondary: #475569;
    --color-text-muted: #64748b;
    --color-text-white: #0f172a;
    --color-shadow: rgba(0, 0, 0, 0.06);
}

/* Specific Light Theme Component Overrides */
[data-theme="light"] body {
    color: #1e293b !important;
    background-color: #f8fafc !important;
}

[data-theme="light"] .sidebar {
    background: #ffffff !important;
    border-right-color: #cbd5e1 !important;
}

[data-theme="light"] .top-header {
    background: #ffffff !important;
    border-bottom-color: #cbd5e1 !important;
}

[data-theme="light"] .card, 
[data-theme="light"] .table-container,
[data-theme="light"] .data-table-container,
[data-theme="light"] .login-card,
[data-theme="light"] .chat-app-container,
[data-theme="light"] .chat-sidebar,
[data-theme="light"] .chat-main,
[data-theme="light"] .chat-main-header,
[data-theme="light"] .chat-input-bar {
    background-color: #ffffff !important;
    border-color: #cbd5e1 !important;
    color: #0f172a !important;
}

[data-theme="light"] .chat-messages-area {
    background-color: #f8fafc !important;
}

[data-theme="light"] .chat-bubble-content {
    background: #f1f5f9 !important;
    color: #0f172a !important;
    border-color: #cbd5e1 !important;
}

[data-theme="light"] .chat-bubble-row.is-self .chat-bubble-content {
    background: #3b82f6 !important;
    color: #ffffff !important;
}

[data-theme="light"] .form-input,
[data-theme="light"] .form-select,
[data-theme="light"] .form-textarea {
    background-color: #ffffff !important;
    border-color: #cbd5e1 !important;
    color: #0f172a !important;
}

[data-theme="light"] table.data-table th {
    background-color: #f1f5f9 !important;
    color: #475569 !important;
    border-bottom-color: #cbd5e1 !important;
}

[data-theme="light"] table.data-table td {
    border-bottom-color: #cbd5e1 !important;
    color: #1e293b !important;
}

[data-theme="light"] table.data-table tr:hover {
    background-color: #f8fafc !important;
}

[data-theme="light"] .table-user-name {
    color: #0f172a !important;
}

[data-theme="light"] h1, 
[data-theme="light"] h2, 
[data-theme="light"] h3, 
[data-theme="light"] h4, 
[data-theme="light"] .page-title,
[data-theme="light"] .card-title,
[data-theme="light"] .sidebar-brand-text,
[data-theme="light"] .sidebar-user-name {
    color: #0f172a !important;
}

:root {

    /* Typography */
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Plus Jakarta Sans', 'Inter', sans-serif;

    --text-xs: 0.75rem;
    --text-sm: 0.8125rem;
    --text-base: 0.9375rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -4px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(79, 110, 247, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Layout */
    --sidebar-width: 260px;
    --sidebar-collapsed: 70px;
    --header-height: 64px;
    --content-max-width: 1400px;
}

/* =============================================
   Reset & Base
   ============================================= */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    font-weight: 400;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    overflow-x: hidden;
}

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

a:hover {
    color: var(--color-primary-light);
}

img {
    max-width: 100%;
    height: auto;
}

/* =============================================
   Typography
   ============================================= */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-text-white);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

.page-title {
    font-size: var(--text-2xl);
    font-weight: 800;
    margin-bottom: var(--space-1);
}

.page-subtitle {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    font-weight: 400;
}

/* =============================================
   Layout — App Shell
   ============================================= */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.main-wrapper {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: margin-left var(--transition-base);
}

.main-content {
    flex: 1;
    padding: var(--space-8);
    max-width: var(--content-max-width);
    width: 100%;
    margin: 0 auto;
}

/* =============================================
   Sidebar
   ============================================= */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    transition: width var(--transition-base), transform var(--transition-base);
    overflow: hidden;
}

.sidebar-brand {
    padding: var(--space-6) var(--space-5);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.sidebar-brand-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-lg);
    font-weight: 800;
    color: #fff;
    flex-shrink: 0;
}

.sidebar-brand-text {
    font-family: var(--font-heading);
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--color-text-white);
    white-space: nowrap;
    overflow: hidden;
}

.sidebar-brand-text span {
    display: block;
    font-size: var(--text-xs);
    font-weight: 400;
    color: var(--color-text-muted);
    margin-top: 2px;
}

.sidebar-nav {
    flex: 1;
    padding: var(--space-4) 0;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) transparent;
}

.sidebar-nav-label {
    padding: var(--space-4) var(--space-5) var(--space-2);
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
}

.sidebar-nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-5);
    margin: 2px var(--space-2);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
    white-space: nowrap;
}

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

.sidebar-nav-item.active {
    background: var(--color-primary-bg);
    color: var(--color-primary);
    font-weight: 600;
}

.sidebar-nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    width: 3px;
    height: 24px;
    background: var(--color-primary);
    border-radius: 0 3px 3px 0;
}

.sidebar-nav-item .nav-icon {
    font-size: var(--text-lg);
    width: 22px;
    text-align: center;
    flex-shrink: 0;
}

.sidebar-footer {
    padding: var(--space-4) var(--space-5);
    border-top: 1px solid var(--color-border);
}

.sidebar-user {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    background: var(--color-bg-tertiary);
}

.sidebar-user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xs);
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}

.sidebar-user-info {
    overflow: hidden;
}

.sidebar-user-name {
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-white);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user-role {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    text-transform: capitalize;
}

/* =============================================
   Top Header
   ============================================= */
.top-header {
    height: var(--header-height);
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-8);
    position: sticky;
    top: 0;
    z-index: 900;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--color-text);
    font-size: var(--text-xl);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.mobile-menu-btn:hover {
    background: var(--color-bg-hover);
}

.header-greeting {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.header-greeting strong {
    color: var(--color-text-white);
}

.header-date {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    padding: var(--space-2) var(--space-3);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
}

.header-user-section {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.header-avatar {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xs);
    font-weight: 700;
    color: #fff;
}

.btn-logout {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

/* =============================================
   Page Header (Title + Actions)
   ============================================= */
.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: var(--space-8);
    flex-wrap: wrap;
    gap: var(--space-4);
}

.page-header-actions {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

/* =============================================
   Cards
   ============================================= */
.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    transition: all var(--transition-base);
}

.card:hover {
    border-color: var(--color-border-light);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--color-border);
}

.card-title {
    font-size: var(--text-lg);
    font-weight: 700;
}

/* =============================================
   Stats Cards (Dashboard)
   ============================================= */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-5);
    margin-bottom: var(--space-8);
}

.stat-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-5) var(--space-6);
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.stat-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-color, var(--color-primary)), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.stat-card:hover {
    border-color: var(--color-border-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.stat-card:hover::after {
    opacity: 1;
}

.stat-card.accent-blue { --accent-color: var(--color-primary); }
.stat-card.accent-green { --accent-color: var(--color-success); }
.stat-card.accent-yellow { --accent-color: var(--color-warning); }
.stat-card.accent-red { --accent-color: var(--color-danger); }
.stat-card.accent-purple { --accent-color: var(--color-purple); }
.stat-card.accent-cyan { --accent-color: var(--color-info); }

.stat-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-xl);
    flex-shrink: 0;
}

.stat-icon.bg-blue { background: var(--color-primary-bg); color: var(--color-primary); }
.stat-icon.bg-green { background: var(--color-success-bg); color: var(--color-success); }
.stat-icon.bg-yellow { background: var(--color-warning-bg); color: var(--color-warning); }
.stat-icon.bg-red { background: var(--color-danger-bg); color: var(--color-danger); }
.stat-icon.bg-purple { background: var(--color-purple-bg); color: var(--color-purple); }
.stat-icon.bg-cyan { background: var(--color-info-bg); color: var(--color-info); }

.stat-content {
    flex: 1;
    min-width: 0;
}

.stat-value {
    font-family: var(--font-heading);
    font-size: var(--text-2xl);
    font-weight: 800;
    color: var(--color-text-white);
    line-height: 1;
    margin-bottom: var(--space-1);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* =============================================
   Content Grids
   ============================================= */
.content-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.content-grid-full {
    grid-column: 1 / -1;
}

/* =============================================
   Tables
   ============================================= */
.table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    background: var(--color-bg-card);
}

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

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

.data-table th {
    padding: var(--space-3) var(--space-4);
    text-align: left;
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    white-space: nowrap;
    border-bottom: 1px solid var(--color-border);
}

.data-table td {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
    vertical-align: middle;
}

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

.data-table tbody tr:hover {
    background: var(--color-bg-hover);
}

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

.table-user {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.table-user-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}

.table-user-name {
    font-weight: 600;
    color: var(--color-text-white);
}

.table-user-email {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

.table-actions {
    display: flex;
    gap: var(--space-2);
}

/* =============================================
   Badges
   ============================================= */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
    white-space: nowrap;
    line-height: 1.4;
}

.badge-primary { background: var(--color-primary-bg); color: var(--color-primary); }
.badge-success { background: var(--color-success-bg); color: var(--color-success); }
.badge-warning { background: var(--color-warning-bg); color: var(--color-warning); }
.badge-danger { background: var(--color-danger-bg); color: var(--color-danger); }
.badge-info { background: var(--color-info-bg); color: var(--color-info); }
.badge-purple { background: var(--color-purple-bg); color: var(--color-purple); }
.badge-secondary { background: var(--color-bg-tertiary); color: var(--color-text-secondary); }

.badge-overdue {
    background: var(--color-danger-bg);
    color: var(--color-danger);
    animation: pulse-badge 2s ease-in-out infinite;
}

@keyframes pulse-badge {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* =============================================
   Buttons
   ============================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-5);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    line-height: 1.5;
}

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

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-dark);
    box-shadow: 0 4px 12px rgba(79, 110, 247, 0.3);
    transform: translateY(-1px);
}

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

.btn-success:hover:not(:disabled) {
    background: #0d9668;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
    transform: translateY(-1px);
}

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

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
    transform: translateY(-1px);
}

.btn-warning {
    background: var(--color-warning);
    color: #000;
}

.btn-warning:hover:not(:disabled) {
    background: #d97706;
    transform: translateY(-1px);
}

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

.btn-outline:hover:not(:disabled) {
    background: var(--color-bg-hover);
    color: var(--color-text-white);
    border-color: var(--color-border-light);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border: none;
    padding: var(--space-2);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--color-bg-hover);
    color: var(--color-text-white);
}

.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
}

.btn-lg {
    padding: var(--space-3) var(--space-8);
    font-size: var(--text-base);
}

.btn-icon {
    width: 34px;
    height: 34px;
    padding: 0;
    border-radius: var(--radius-md);
}

.btn-icon.btn-sm {
    width: 28px;
    height: 28px;
}

/* Check-in / Check-out buttons */
.btn-checkin {
    background: linear-gradient(135deg, var(--color-success), #059669);
    color: #fff;
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
    border-radius: var(--radius-lg);
    border: none;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-checkin:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.btn-checkout {
    background: linear-gradient(135deg, var(--color-danger), #dc2626);
    color: #fff;
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
    border-radius: var(--radius-lg);
    border: none;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.btn-checkout:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
}

/* =============================================
   Forms
   ============================================= */
.form-group {
    margin-bottom: var(--space-5);
}

.form-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    transition: all var(--transition-fast);
    outline: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-bg);
}

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

.form-textarea {
    min-height: 100px;
    resize: vertical;
}

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239ca3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.form-error {
    font-size: var(--text-xs);
    color: var(--color-danger);
    margin-top: var(--space-1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-4);
}

.form-actions {
    display: flex;
    gap: var(--space-3);
    padding-top: var(--space-4);
}

/* Filter bar */
.filter-bar {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-5);
    flex-wrap: wrap;
}

.filter-bar .form-input,
.filter-bar .form-select {
    max-width: 200px;
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
}

/* =============================================
   Alerts / Flash Messages
   ============================================= */
.alert {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-5);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-5);
    font-size: var(--text-sm);
    font-weight: 500;
    animation: slideDown 0.3s ease-out;
}

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

.alert-success {
    background: var(--color-success-bg);
    color: var(--color-success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.alert-error {
    background: var(--color-danger-bg);
    color: var(--color-danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.alert-warning {
    background: var(--color-warning-bg);
    color: var(--color-warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.alert-info {
    background: var(--color-primary-bg);
    color: var(--color-primary);
    border: 1px solid rgba(79, 110, 247, 0.2);
}

.alert-close {
    background: none;
    border: none;
    color: inherit;
    font-size: var(--text-lg);
    cursor: pointer;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
    line-height: 1;
}

.alert-close:hover {
    opacity: 1;
}

/* =============================================
   Modal
   ============================================= */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.modal {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    width: 90%;
    max-width: 560px;
    max-height: 85vh;
    overflow-y: auto;
    transform: scale(0.95) translateY(10px);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-xl);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-5) var(--space-6);
    border-bottom: 1px solid var(--color-border);
}

.modal-title {
    font-size: var(--text-lg);
    font-weight: 700;
}

.modal-close {
    background: none;
    border: none;
    color: var(--color-text-muted);
    font-size: var(--text-xl);
    cursor: pointer;
    padding: var(--space-1);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    line-height: 1;
}

.modal-close:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-white);
}

.modal-body {
    padding: var(--space-6);
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    border-top: 1px solid var(--color-border);
}

/* =============================================
   Attendance Check-in Card
   ============================================= */
.attendance-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    text-align: center;
    margin-bottom: var(--space-6);
}

.attendance-status {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-4);
}

.attendance-time {
    display: flex;
    justify-content: center;
    gap: var(--space-8);
    margin-top: var(--space-6);
}

.attendance-time-item {
    text-align: center;
}

.attendance-time-label {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-1);
}

.attendance-time-value {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text-white);
}

/* =============================================
   Task Cards
   ============================================= */
.task-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.task-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-4) var(--space-5);
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    transition: all var(--transition-fast);
}

.task-item:hover {
    border-color: var(--color-border-light);
    background: var(--color-bg-hover);
}

.task-item.priority-high {
    border-left: 3px solid var(--color-danger);
}

.task-item.priority-medium {
    border-left: 3px solid var(--color-warning);
}

.task-item.priority-low {
    border-left: 3px solid var(--color-info);
}

.task-info {
    flex: 1;
    min-width: 0;
}

.task-title {
    font-weight: 600;
    color: var(--color-text-white);
    margin-bottom: var(--space-1);
}

.task-meta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    flex-wrap: wrap;
}

.task-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-shrink: 0;
}

/* =============================================
   Empty State
   ============================================= */
.empty-state {
    text-align: center;
    padding: var(--space-12) var(--space-6);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    opacity: 0.3;
}

.empty-state-title {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

.empty-state-text {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    max-width: 300px;
    margin: 0 auto;
}

/* =============================================
   Login Page
   ============================================= */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    padding: var(--space-4);
    position: relative;
    overflow: hidden;
}

.login-page::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(79, 110, 247, 0.08), transparent 70%);
    top: -100px;
    right: -100px;
    border-radius: 50%;
}

.login-page::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(139, 92, 246, 0.06), transparent 70%);
    bottom: -50px;
    left: -50px;
    border-radius: 50%;
}

.login-container {
    width: 100%;
    max-width: 420px;
    position: relative;
    z-index: 1;
}

.login-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-10);
    box-shadow: var(--shadow-xl);
}

.login-brand {
    text-align: center;
    margin-bottom: var(--space-8);
}

.login-brand-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-purple));
    border-radius: var(--radius-lg);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-2xl);
    font-weight: 800;
    color: #fff;
    margin-bottom: var(--space-4);
}

.login-brand h1 {
    font-size: var(--text-xl);
    font-weight: 800;
    margin-bottom: var(--space-1);
}

.login-brand p {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.login-form .form-group {
    margin-bottom: var(--space-4);
}

.login-form .form-input {
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
}

.login-form .btn {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-base);
    margin-top: var(--space-2);
}

/* =============================================
   Activity Feed
   ============================================= */
.activity-list {
    display: flex;
    flex-direction: column;
}

.activity-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-3) 0;
    border-bottom: 1px solid var(--color-border);
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--text-sm);
    flex-shrink: 0;
}

.activity-text {
    flex: 1;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.activity-text strong {
    color: var(--color-text-white);
}

.activity-time {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    white-space: nowrap;
}

/* =============================================
   Pagination
   ============================================= */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-5) 0;
}

.pagination-btn {
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.pagination-btn:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-white);
}

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

/* =============================================
   Confirm Dialog
   ============================================= */
.confirm-dialog {
    text-align: center;
    padding: var(--space-4) 0;
}

.confirm-dialog-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
}

.confirm-dialog-title {
    font-size: var(--text-lg);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

.confirm-dialog-text {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
}

/* =============================================
   Loading Spinner
   ============================================= */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

.loading-overlay {
    position: absolute;
    inset: 0;
    background: rgba(15, 17, 23, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: inherit;
    z-index: 10;
}

/* =============================================
   Utilities
   ============================================= */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-muted); }
.text-success { color: var(--color-success); }
.text-danger { color: var(--color-danger); }
.text-warning { color: var(--color-warning); }
.text-primary { color: var(--color-primary); }

.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }

.w-full { width: 100%; }
.relative { position: relative; }

.truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* =============================================
   Animations — Fade In
   ============================================= */
.fade-in {
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.stagger-1 { animation-delay: 0.05s; }
.stagger-2 { animation-delay: 0.1s; }
.stagger-3 { animation-delay: 0.15s; }
.stagger-4 { animation-delay: 0.2s; }
.stagger-5 { animation-delay: 0.25s; }
.stagger-6 { animation-delay: 0.3s; }
.stagger-7 { animation-delay: 0.35s; }
.stagger-8 { animation-delay: 0.4s; }

/* =============================================
   Responsive — Tablet
   ============================================= */
@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .content-grid {
        grid-template-columns: 1fr;
    }

    .main-content {
        padding: var(--space-5);
    }
}

/* =============================================
   Responsive — Mobile
   ============================================= */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        z-index: 1100;
    }

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

    .sidebar-backdrop {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 1050;
        display: none;
    }

    .sidebar-backdrop.active {
        display: block;
    }

    .main-wrapper {
        margin-left: 0;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .top-header {
        padding: 0 var(--space-4);
    }

    .main-content {
        padding: var(--space-4);
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-3);
    }

    .stat-card {
        padding: var(--space-4);
    }

    .stat-value {
        font-size: var(--text-xl);
    }

    .page-header {
        flex-direction: column;
    }

    .filter-bar {
        flex-direction: column;
    }

    .filter-bar .form-input,
    .filter-bar .form-select {
        max-width: 100%;
    }

    .attendance-time {
        gap: var(--space-4);
    }

    .modal {
        width: 95%;
        margin: var(--space-4);
    }

    .login-card {
        padding: var(--space-6);
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .header-date {
        display: none;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    h1, .page-title {
        font-size: var(--text-xl);
    }
}

/* =============================================
   System-Wide Mobile & Tablet Responsiveness Enhancements
   ============================================= */
@media (max-width: 1024px) {
    .table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        border-radius: var(--radius-md);
        margin-bottom: var(--space-4);
    }
    
    .table-container table {
        min-width: 650px;
    }
}

@media (max-width: 768px) {
    .app-layout {
        flex-direction: column;
    }

    /* Hide Logout text on mobile, keep vector icon only */
    .btn-logout-text {
        display: none !important;
    }

    .btn-logout {
        padding: 8px 10px !important;
        min-width: auto !important;
    }

    .btn-logout i {
        margin-right: 0 !important;
    }

    /* Mobile Chat Adaptive Single-Pane View */
    .chat-app-container {
        height: calc(100vh - 100px);
        flex-direction: column;
    }

    .chat-app-container .chat-sidebar {
        width: 100% !important;
        flex: 1;
    }

    .chat-app-container.room-active .chat-sidebar {
        display: none !important;
    }

    .chat-app-container:not(.room-active) .chat-main {
        display: none !important;
    }

    .chat-app-container.room-active .chat-main {
        display: flex !important;
        width: 100% !important;
        flex: 1;
    }

    .chat-bubble-row {
        max-width: 90% !important;
    }

    /* Touch Friendly Tap Targets */
    .btn, .form-input, .form-select, .form-textarea {
        min-height: 42px;
    }

    .form-actions {
        flex-direction: column;
        gap: 10px;
    }

    .form-actions .btn {
        width: 100% !important;
    }

    /* Attendance Card & Timers */
    #shiftTimerWidget {
        padding: 14px 16px !important;
    }

    #shiftTimerWidget #timer-work-display {
        font-size: 32px !important;
    }

    /* Modals */
    .modal-backdrop .card {
        padding: var(--space-4) !important;
    }
}

/* =============================================
   Dedicated 375px Mobile Viewport Optimization
   ============================================= */
@media (max-width: 375px) {
    html, body {
        width: 100% !important;
        overflow-x: hidden !important;
    }

    .main-content {
        padding: 10px !important;
    }

    .top-header {
        padding: 0 10px !important;
    }

    .header-greeting p {
        display: none !important;
    }

    .header-user-name {
        display: none !important;
    }

    .card {
        padding: 12px !important;
        margin-bottom: 12px !important;
    }

    .stats-grid {
        grid-template-columns: 1fr !important;
        gap: 10px !important;
    }

    .stat-card {
        padding: 12px !important;
    }

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

    #shiftTimerWidget {
        padding: 12px !important;
    }

    #shiftTimerWidget #timer-work-display {
        font-size: 24px !important;
    }

    .chat-app-container {
        height: calc(100vh - 75px) !important;
    }

    .chat-input-bar {
        padding: 10px !important;
    }

    .chat-input-controls {
        gap: 6px !important;
    }

    .modal-backdrop .card {
        width: 92vw !important;
        padding: 12px !important;
    }
}