/**
 * TaskFlow Team Manager - Main Stylesheet
 * Modern SaaS admin dashboard styling
 */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
    --sidebar-width: 260px;
    --sidebar-collapsed: 70px;
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --sidebar-bg: #1e293b;
    --sidebar-hover: #334155;
    --sidebar-active: #2563eb;
    --content-bg: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --info-color: #06b6d4;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--content-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--sidebar-bg);
    z-index: 1000;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-header {
    padding: 20px 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #fff;
}

.brand-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
}

.brand-text {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.brand-text span {
    font-weight: 400;
    opacity: 0.8;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
}

.nav-section {
    margin-bottom: 24px;
}

.nav-section-title {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    padding: 0 12px;
    margin-bottom: 8px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: #cbd5e1;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    margin-bottom: 4px;
}

.nav-link:hover {
    background-color: var(--sidebar-hover);
    color: #fff;
}

.nav-link.active {
    background-color: var(--sidebar-active);
    color: #fff;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.nav-link i {
    font-size: 1.1rem;
    width: 24px;
    text-align: center;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: var(--radius-sm);
    background-color: rgba(255, 255, 255, 0.05);
}

.user-avatar {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.85rem;
    font-weight: 600;
}

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

.user-name {
    color: #fff;
    font-size: 0.85rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-role {
    font-size: 0.75rem;
}

/* ============================================
   MAIN CONTENT
   ============================================ */
.main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: var(--transition);
}

/* ============================================
   TOP NAVBAR
   ============================================ */
.top-navbar {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 24px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.navbar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.breadcrumb {
    margin: 0;
    padding: 0;
    background: none;
    font-size: 0.85rem;
}

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

.breadcrumb-item.active {
    color: var(--text-primary);
    font-weight: 500;
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.nav-btn {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--card-bg);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.nav-btn:hover {
    background-color: var(--content-bg);
    color: var(--text-primary);
    border-color: var(--text-muted);
}

.notification-badge {
    position: absolute;
    top: -2px;
    right: -2px;
    width: 18px;
    height: 18px;
    background-color: var(--danger-color);
    color: #fff;
    border-radius: 50%;
    font-size: 0.65rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

/* ============================================
   CONTENT AREA
   ============================================ */
.content-area {
    padding: 24px;
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    transition: var(--transition);
}

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

.stat-card {
    border: none;
    background: var(--card-bg);
}

.stat-card .card-body {
    padding: 24px;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

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

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

.trend-badge {
    font-size: 0.8rem;
    font-weight: 600;
}

.project-card {
    transition: var(--transition);
    border: none;
}

.project-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.project-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.team-card {
    transition: var(--transition);
    border: none;
}

.team-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.table {
    margin: 0;
}

.table thead th {
    background-color: var(--content-bg);
    color: var(--text-secondary);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 14px 20px;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}

.table tbody td {
    padding: 16px 20px;
    vertical-align: middle;
    color: var(--text-primary);
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border-color);
}

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

.table tbody tr:hover {
    background-color: rgba(37, 99, 235, 0.02);
}

.task-priority-indicator {
    width: 4px;
    height: 40px;
    border-radius: 2px;
    flex-shrink: 0;
}

.status-select {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
    font-size: 0.85rem;
    background-color: var(--card-bg);
    cursor: pointer;
}

.status-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ============================================
   BADGES
   ============================================ */
.badge {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 20px;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    font-weight: 500;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

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

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

.btn-sm {
    padding: 6px 14px;
    font-size: 0.85rem;
}

/* ============================================
   FORMS
   ============================================ */
.form-control, .form-select {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 0.9rem;
    transition: var(--transition);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.input-group {
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.input-group-text {
    background-color: var(--content-bg);
    border-color: var(--border-color);
    color: var(--text-secondary);
}

/* ============================================
   AUTH PAGES (Login/Register)
   ============================================ */
.auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 50%, #dbeafe 100%);
    padding: 20px;
}

.auth-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 440px;
    padding: 40px;
    border: 1px solid var(--border-color);
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-logo {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-color), #3b82f6);
    border-radius: var(--radius);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 24px;
    margin-bottom: 20px;
}

.auth-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.auth-form .form-control {
    padding: 14px 16px;
    font-size: 0.95rem;
}

.auth-form .btn {
    padding: 14px;
    font-size: 1rem;
    width: 100%;
    justify-content: center;
}

.auth-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.auth-footer a {
    color: var(--primary-color);
    font-weight: 600;
}

.auth-footer a:hover {
    text-decoration: underline;
}

.alert-error {
    background-color: #fef2f2;
    border: 1px solid #fecaca;
    color: #dc2626;
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 0.9rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ============================================
   MODALS
   ============================================ */
.modal-content {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
    padding: 20px 24px;
}

.modal-title {
    font-weight: 700;
    font-size: 1.1rem;
}

.modal-body {
    padding: 24px;
}

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

/* ============================================
   EMPTY STATE
   ============================================ */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    background-color: var(--content-bg);
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 32px;
    color: var(--text-muted);
}

.empty-state h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.empty-state p {
    font-size: 0.9rem;
    max-width: 400px;
    margin: 0 auto 20px;
}

/* ============================================
   PROGRESS BARS
   ============================================ */
.progress {
    background-color: var(--content-bg);
    border-radius: 10px;
    overflow: hidden;
}

.progress-bar {
    border-radius: 10px;
}

/* ============================================
   STATUS INDICATORS
   ============================================ */
.status-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

.status-online {
    background-color: var(--success-color);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.status-offline {
    background-color: var(--text-muted);
}

/* ============================================
   AVATARS
   ============================================ */
.avatar-sm {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    flex-shrink: 0;
}

/* ============================================
   SEARCH & FILTERS
   ============================================ */
.search-box {
    position: relative;
}

.search-box .form-control {
    padding-left: 40px;
}

.search-box .bi-search {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ============================================
   CHARTS
   ============================================ */
.chart-container {
    padding: 8px;
}

/* ============================================
   MOBILE RESPONSIVE
   ============================================ */
@media (max-width: 991.98px) {
    .sidebar {
        transform: translateX(-100%);
        width: var(--sidebar-width);
    }

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

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

    .mobile-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: rgba(0, 0, 0, 0.5);
        z-index: 999;
        display: none;
    }

    .mobile-overlay.show {
        display: block;
    }

    .content-area {
        padding: 16px;
    }

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

    .page-title {
        font-size: 1.25rem;
    }
}

@media (max-width: 767.98px) {
    .auth-card {
        padding: 24px;
    }

    .table-responsive {
        border-radius: var(--radius);
    }

    .navbar-actions {
        gap: 8px;
    }

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

/* ============================================
   SCROLLBAR
   ============================================ */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.card {
    animation: fadeIn 0.3s ease forwards;
}

/* ============================================
   DROPDOWN MENU
   ============================================ */
.dropdown-menu {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    padding: 8px;
}

.dropdown-item {
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    font-size: 0.9rem;
}

.dropdown-item:hover {
    background-color: var(--content-bg);
}

.dropdown-divider {
    margin: 8px 0;
    border-color: var(--border-color);
}