/* Modern Dashboard Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --success-color: #4CAF50;
    --warning-color: #FF9800;
    --danger-color: #f44336;
    --info-color: #2196F3;
    --dark-bg: #1a1a1a;
    --light-bg: #f8f9fa;
    --card-bg: #ffffff;
    --text-primary: #333333;
    --text-secondary: #666666;
    --border-color: #e1e5e9;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.15);
    --sidebar-width: 280px;
    --header-height: 80px;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--light-bg);
    color: var(--text-primary);
    overflow-x: hidden;
}

/* Dark Theme */
body.dark-theme {
    --light-bg: #121212;
    --card-bg: #1e1e1e;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --border-color: #333333;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 4px 20px rgba(0, 0, 0, 0.4);
}

/* Dashboard Layout */
.dashboard-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
}

.sidebar-header {
    padding: 2rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.sidebar-header i {
    font-size: 2rem;
    color: #ffffff;
}

.sidebar-header span {
    font-size: 1.5rem;
    font-weight: 700;
}

.sidebar-menu {
    flex: 1;
    padding: 1rem 0;
    list-style: none;
}

.menu-item {
    margin: 0.5rem 0;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border-left: 4px solid transparent;
}

.menu-item:hover {
    background: rgba(255, 255, 255, 0.1);
    border-left-color: rgba(255, 255, 255, 0.5);
}

.menu-item.active {
    background: rgba(255, 255, 255, 0.15);
    border-left-color: #ffffff;
}

.menu-item i {
    font-size: 1.2rem;
    width: 20px;
}

.menu-item span {
    font-weight: 500;
}

.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-footer .logout-btn {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: white;
    border-radius: var(--border-radius);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: var(--transition);
    font-size: 0.9rem;
}

.sidebar-footer .logout-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

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

/* Dashboard Header */
.dashboard-header {
    height: var(--header-height);
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    box-shadow: var(--shadow);
}

.header-left h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.header-left p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
}

.user-details {
    display: flex;
    flex-direction: column;
}

.user-details span:first-child {
    font-weight: 600;
    color: var(--text-primary);
}

.user-details span:last-child {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 8px;
    background: var(--light-bg);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

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

/* Tab Content */
.tab-content {
    display: none;
    padding: 2rem;
}

.tab-content.active {
    display: block;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 1rem;
    transition: var(--transition);
}

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

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
}

.stat-content h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.stat-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.stat-change {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.stat-change.positive {
    background: rgba(76, 175, 80, 0.1);
    color: var(--success-color);
}

.stat-change.negative {
    background: rgba(244, 67, 54, 0.1);
    color: var(--danger-color);
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.chart-card,
.activity-card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

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

.card-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

.refresh-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 6px;
    transition: var(--transition);
}

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

.chart-container {
    padding: 1.5rem;
    height: 300px;
}

.activity-list {
    padding: 1rem;
    max-height: 300px;
    overflow-y: auto;
}

.activity-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.activity-item:hover {
    background: var(--light-bg);
}

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

.activity-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.activity-content p {
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.activity-content small {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.no-activity {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem;
    font-style: italic;
}

/* Quick Actions */
.quick-actions {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.quick-actions h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.quick-action-btn {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    background: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.quick-action-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-1px);
}

.quick-action-btn i {
    font-size: 1.2rem;
}

.quick-action-btn span {
    font-weight: 500;
}

/* Calculator Section */
.calculator-section {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.calculator-header {
    text-align: center;
    margin-bottom: 2rem;
}

.calculator-header h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.calculator-header p {
    color: var(--text-secondary);
}

.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.calculator-inputs {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.input-group input,
.input-group select {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.calculate-btn {
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition);
    margin-top: 1rem;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
}

.calculator-result {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.result-display {
    min-height: 80px;
    padding: 1.5rem;
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
}

.result-display.show {
    opacity: 1;
    transform: translateY(0);
}

.result-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn.secondary {
    flex: 1;
    padding: 0.75rem;
    background: var(--light-bg);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.action-btn.secondary:hover {
    background: var(--primary-color);
    color: white;
}

/* Analytics Section */
.analytics-section {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.analytics-section h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2rem;
    text-align: center;
}

.analytics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.analytics-card {
    background: var(--light-bg);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.analytics-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.operation-chart-wrap {
    height: 260px;
    position: relative;
}

.operation-breakdown {
    margin-top: 1rem;
    display: grid;
    gap: 0.5rem;
}

.operation-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.55rem 0.75rem;
    border-radius: 8px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.operation-row strong {
    font-weight: 600;
    color: var(--text-primary);
}

.operation-row span {
    color: var(--text-secondary);
}

.operation-empty {
    color: var(--text-secondary);
    text-align: center;
    padding: 0.75rem;
    border-radius: 8px;
    border: 1px dashed var(--border-color);
    background: var(--card-bg);
}

.metrics-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.metric {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: var(--card-bg);
    border-radius: 6px;
    border: 1px solid var(--border-color);
}

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

.metric-value {
    font-weight: 700;
    color: var(--text-primary);
}

/* History Section */
.history-section {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.history-header h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
}

.history-controls {
    display: flex;
    gap: 1rem;
}

.history-controls input,
.history-controls select {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.9rem;
}

.history-list {
    background: var(--light-bg);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1.5rem;
    max-height: 400px;
    overflow-y: auto;
}

.history-stats {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.history-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.manage-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    transition: var(--transition);
}

.manage-btn.refresh-btn {
    background: var(--info-color);
    color: white;
}

.manage-btn.export-btn {
    background: var(--success-color);
    color: white;
}

.manage-btn.clear-btn {
    background: var(--danger-color);
    color: white;
}

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

/* Profile Section */
.profile-section {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.profile-section h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2rem;
    text-align: center;
}

.profile-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.profile-card {
    background: var(--light-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    border: 1px solid var(--border-color);
}

.profile-avatar {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.profile-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.profile-info p {
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.profile-stats {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.stat-item {
    background: var(--light-bg);
    border-radius: 8px;
    padding: 1rem;
    text-align: center;
    border: 1px solid var(--border-color);
}

.stat-number {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.profile-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.profile-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    transition: var(--transition);
    background: var(--primary-color);
    color: white;
}

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

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

/* Login Prompt */
.login-container {
    max-width: 400px;
    margin: 0 auto;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    text-align: center;
}

.login-container h1 {
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.login-container p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.auth-btn {
    padding: 0.75rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.auth-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .sidebar {
        width: 250px;
    }

    .main-content {
        margin-left: 250px;
    }

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

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

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

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

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

    .dashboard-header {
        padding: 0 1rem;
    }

    .header-left h1 {
        font-size: 1.5rem;
    }

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

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

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

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

    .history-header {
        flex-direction: column;
        gap: 1rem;
    }

    .history-controls {
        flex-direction: column;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.tab-content.active {
    animation: fadeIn 0.3s ease;
}

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

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

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

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