/**
 * Team Analytics - Main Stylesheet
 * Monochrome Dark Theme - Black & White
 */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    /* Colors - Monochrome Dark Theme */
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-tertiary: #1a1a1a;
    --bg-card: #141414;
    --bg-hover: #1f1f1f;
    
    --text-primary: #ffffff;
    --text-secondary: #a3a3a3;
    --text-muted: #6b6b6b;
    
    --border-color: #262626;
    --border-light: #333333;
    
    /* Accent Colors - Minimal */
    --primary: #ffffff;
    --primary-hover: #e5e5e5;
    --primary-light: rgba(255, 255, 255, 0.08);
    
    --success: #4ade80;
    --success-light: rgba(74, 222, 128, 0.15);
    
    --warning: #fbbf24;
    --warning-light: rgba(251, 191, 36, 0.15);
    
    --danger: #f87171;
    --danger-light: rgba(248, 113, 113, 0.15);
    
    --info: #a3a3a3;
    --info-light: rgba(163, 163, 163, 0.15);
    
    /* Gradients - Subtle */
    --gradient-primary: linear-gradient(135deg, #ffffff 0%, #d4d4d4 100%);
    --gradient-success: linear-gradient(135deg, #4ade80 0%, #22c55e 100%);
    --gradient-card: linear-gradient(145deg, #141414 0%, #1a1a1a 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(255, 255, 255, 0.1);
    
    /* Sizing */
    --sidebar-width: 260px;
    --sidebar-collapsed: 70px;
    --topbar-height: 70px;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

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

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

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

/* ============================================
   App Container
   ============================================ */
.app-container {
    display: flex;
    min-height: 100vh;
}

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

.sidebar.collapsed {
    width: var(--sidebar-collapsed);
}

.sidebar-header {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--text-primary);
}

.logo-text {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.sidebar.collapsed .logo-text {
    display: none;
}

.sidebar-toggle {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--border-radius-sm);
    transition: background var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-toggle svg {
    width: 20px;
    height: 20px;
}

.sidebar-toggle:hover {
    background: var(--bg-hover);
}

.sidebar-nav {
    flex: 1;
    padding: 1rem 0.75rem;
    overflow-y: auto;
}

.nav-list {
    list-style: none;
}

.nav-item {
    margin-bottom: 0.25rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 0.875rem 1rem;
    border-radius: var(--border-radius-sm);
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
}

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

.nav-item.active .nav-link {
    background: var(--primary-light);
    color: var(--text-primary);
    border-left: 3px solid var(--primary);
}

.nav-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-icon svg {
    width: 20px;
    height: 20px;
}

.sidebar.collapsed .nav-label {
    display: none;
}

.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

.app-version {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

/* ============================================
   Main Content
   ============================================ */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    transition: margin-left var(--transition-normal);
}

.sidebar.collapsed ~ .main-content {
    margin-left: var(--sidebar-collapsed);
}

/* ============================================
   Top Bar
   ============================================ */
.top-bar {
    height: var(--topbar-height);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    position: sticky;
    top: 0;
    z-index: 50;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: transform var(--transition-fast);
}

.page-title h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.top-bar-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-bar {
    position: relative;
}

.search-bar input {
    width: 280px;
    padding: 0.625rem 1rem 0.625rem 2.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all var(--transition-fast);
}

.search-bar input:focus {
    outline: none;
    border-color: var(--text-muted);
    box-shadow: var(--shadow-glow);
}

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

.search-icon {
    position: absolute;
    left: 0.875rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    display: flex;
    align-items: center;
}

.search-icon svg {
    width: 18px;
    height: 18px;
}

/* ============================================
   Page Content
   ============================================ */
.page-content {
    padding: 1.5rem;
}

/* ============================================
   Cards
   ============================================ */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    transition: all var(--transition-normal);
}

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

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
}

.card-title svg {
    width: 20px;
    height: 20px;
}

.card-body {
    /* Default styling */
}

.card-footer {
    margin-top: 1.25rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

/* ============================================
   Stats Cards
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.25rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 3px;
    height: 100%;
    background: var(--text-primary);
}

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

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-light);
}

.stat-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--text-primary);
}

.stat-content {
    flex: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-change {
    font-size: 0.75rem;
    margin-top: 0.25rem;
    color: var(--text-muted);
}

.stat-change.positive {
    color: var(--success);
}

.stat-change.negative {
    color: var(--danger);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--border-radius);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn svg {
    width: 18px;
    height: 18px;
}

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

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

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

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

.btn-danger:hover {
    background: #ef4444;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

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

/* ============================================
   Tables
   ============================================ */
.table-container {
    overflow-x: auto;
    border-radius: var(--border-radius);
}

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

.table th,
.table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background: var(--bg-tertiary);
    font-weight: 600;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

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

/* ============================================
   Badges
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: 9999px;
}

.badge-primary {
    background: var(--primary-light);
    color: var(--text-primary);
}

.badge-success {
    background: var(--success-light);
    color: var(--success);
}

.badge-warning {
    background: var(--warning-light);
    color: var(--warning);
}

.badge-danger {
    background: var(--danger-light);
    color: var(--danger);
}

/* ============================================
   Avatars
   ============================================ */
.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.avatar-sm {
    width: 32px;
    height: 32px;
    font-size: 0.75rem;
}

.avatar-lg {
    width: 56px;
    height: 56px;
    font-size: 1.125rem;
}

.avatar-xl {
    width: 80px;
    height: 80px;
    font-size: 1.5rem;
}

/* ============================================
   Forms
   ============================================ */
.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 0.9375rem;
    transition: all var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--text-muted);
    box-shadow: 0 0 0 3px var(--primary-light);
}

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

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

select.form-control {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b6b6b' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.75rem center;
    background-repeat: no-repeat;
    background-size: 1.25em 1.25em;
    padding-right: 2.5rem;
}

/* ============================================
   Alerts
   ============================================ */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--border-radius);
    margin: 0 1.5rem 1rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.alert-success {
    background: var(--success-light);
    color: var(--success);
    border: 1px solid var(--success);
}

.alert-danger {
    background: var(--danger-light);
    color: var(--danger);
    border: 1px solid var(--danger);
}

.alert-warning {
    background: var(--warning-light);
    color: var(--warning);
    border: 1px solid var(--warning);
}

.alert-info {
    background: var(--info-light);
    color: var(--info);
    border: 1px solid var(--info);
}

.alert-close {
    background: none;
    border: none;
    cursor: pointer;
    opacity: 0.7;
    color: inherit;
    display: flex;
    align-items: center;
}

.alert-close svg {
    width: 18px;
    height: 18px;
}

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

/* ============================================
   Member/Group List Items
   ============================================ */
.member-item,
.group-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.member-item:hover,
.group-item:hover {
    background: var(--bg-hover);
    border-color: var(--border-color);
}

.member-info,
.group-info {
    flex: 1;
}

.member-name,
.group-name {
    font-weight: 600;
    margin-bottom: 0.125rem;
    color: var(--text-primary);
}

.member-meta,
.group-meta {
    font-size: 0.8125rem;
    color: var(--text-secondary);
}

.member-stats,
.group-stats {
    text-align: right;
}

.member-count,
.group-count {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ============================================
   Progress Bar
   ============================================ */
.progress {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 9999px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--text-primary);
    border-radius: 9999px;
    transition: width var(--transition-slow);
}

/* ============================================
   Charts Container
   ============================================ */
.chart-container {
    position: relative;
    height: 300px;
    width: 100%;
}

/* ============================================
   Ranking List (Top Members/Groups)
   ============================================ */
.ranking-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.ranking-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    text-decoration: none;
    border: 1px solid transparent;
}

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

.ranking-position {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.ranking-info {
    flex: 1;
}

.ranking-name {
    font-weight: 600;
    color: var(--text-primary);
}

.ranking-meta {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.ranking-value {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ============================================
   Empty State
   ============================================ */
.empty-state {
    text-align: center;
    padding: 3rem 2rem;
}

.empty-state-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border-radius: 50%;
}

.empty-state-icon svg {
    width: 32px;
    height: 32px;
    stroke: var(--text-muted);
}

.empty-state-text {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* ============================================
   Grid Layouts
   ============================================ */
.grid {
    display: grid;
    gap: 1.25rem;
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.mb-3 {
    margin-bottom: 1.5rem;
}

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

/* ============================================
   File Upload
   ============================================ */
.file-upload {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 3rem;
    text-align: center;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.file-upload:hover {
    border-color: var(--text-muted);
    background: var(--bg-hover);
}

.file-upload.dragover {
    border-color: var(--text-primary);
    background: var(--primary-light);
}

.file-upload-icon {
    margin-bottom: 1rem;
}

.file-upload-icon svg {
    width: 48px;
    height: 48px;
    stroke: var(--text-muted);
}

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

.file-upload-text strong {
    color: var(--text-primary);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        position: fixed;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .search-bar {
        display: none;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .top-bar-actions .btn span {
        display: none;
    }
}

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

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

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

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