:root {
    /* Dark Theme (Default) - Black & Dark Grey */
    --bg-main: #0a0a0a;
    --bg-secondary: #141414;
    --bg-tertiary: #1f1f1f;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --accent-primary: #f97316; /* Vibrant Orange */
    --accent-hover: #ea580c;
    --border-color: #262626;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #10b981;
    --warning: #f59e0b;
    
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

[data-theme="light"] {
    /* Light Theme - Clean Grey/White */
    --bg-main: #f9fafb;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f3f4f6;
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --accent-primary: #ea580c; /* Slightly darker orange for light bg */
    --accent-hover: #c2410c;
    --border-color: #e5e7eb;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.app-container { display: flex; height: 100vh; overflow: hidden; }

/* Sidebar */
.sidebar { width: 260px; background-color: var(--bg-secondary); border-right: 1px solid var(--border-color); display: flex; flex-direction: column; flex-shrink: 0; }
.sidebar-header { height: 72px; display: flex; align-items: center; padding: 0 24px; border-bottom: 1px solid var(--border-color); }
.logo { display: flex; align-items: center; gap: 12px; font-size: 1.25rem; font-weight: 700; color: var(--text-primary); }
.logo i { color: var(--accent-primary); font-size: 1.5rem; }
.sidebar-nav { flex: 1; padding: 24px 16px; display: flex; flex-direction: column; gap: 8px; }
.nav-item { display: flex; align-items: center; gap: 12px; padding: 12px 16px; color: var(--text-secondary); text-decoration: none; border-radius: 8px; transition: all 0.2s ease; font-weight: 500; }
.nav-item:hover { background-color: var(--bg-tertiary); color: var(--text-primary); }
.nav-item.active { background-color: rgba(99, 102, 241, 0.1); color: var(--accent-primary); }
.sidebar-footer { padding: 20px 16px; border-top: 1px solid var(--border-color); }
.user-profile { display: flex; align-items: center; gap: 12px; }
.avatar { width: 40px; height: 40px; border-radius: 50%; background: linear-gradient(135deg, var(--accent-primary), #a855f7); display: flex; align-items: center; justify-content: center; font-weight: 700; color: white; }
.user-info { display: flex; flex-direction: column; }
.user-name { font-weight: 600; font-size: 0.9rem; }
.user-role { font-size: 0.8rem; color: var(--text-secondary); }

/* Main Content */
.main-content { flex: 1; display: flex; flex-direction: column; overflow: hidden; }
.top-header { height: 72px; display: flex; align-items: center; justify-content: space-between; padding: 0 32px; background-color: var(--bg-main); border-bottom: 1px solid var(--border-color); flex-shrink: 0; }
.header-search { display: flex; align-items: center; background-color: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 8px; padding: 8px 16px; width: 320px; gap: 12px; transition: border-color 0.2s; }
.header-search:focus-within { border-color: var(--accent-primary); }
.header-search i { color: var(--text-secondary); }
.header-search input { background: none; border: none; color: var(--text-primary); outline: none; width: 100%; font-family: inherit; }
.header-actions { display: flex; align-items: center; gap: 16px; }

/* Buttons */
.icon-btn { background: none; border: none; color: var(--text-secondary); cursor: pointer; font-size: 1.2rem; width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; transition: all 0.2s; }
.icon-btn:hover { background-color: var(--bg-secondary); color: var(--text-primary); }
.btn-primary, .btn-secondary { padding: 10px 20px; border-radius: 8px; font-family: inherit; font-weight: 600; cursor: pointer; display: flex; align-items: center; gap: 8px; transition: all 0.2s; border: none; text-decoration: none; font-size: 0.9rem;}
.btn-primary { background-color: var(--accent-primary); color: white; }
.btn-primary:hover { background-color: var(--accent-hover); }
.btn-secondary { background-color: var(--bg-tertiary); color: var(--text-primary); border: 1px solid var(--border-color); }
.btn-secondary:hover { background-color: var(--border-color); }
.btn-danger-sm { background-color: rgba(239, 68, 68, 0.1); color: var(--danger); border: 1px solid rgba(239, 68, 68, 0.2); padding: 6px 12px; border-radius: 6px; font-size: 0.85rem; font-weight: 600; cursor: pointer; display: inline-flex; align-items: center; gap: 6px; transition: all 0.2s; }
.btn-danger-sm:hover { background-color: var(--danger); color: white; }

/* Content Area */
.content-wrapper { flex: 1; overflow-y: auto; padding: 32px; }
.page-header { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 24px; }
h1 { font-size: 2rem; font-weight: 700; letter-spacing: -0.02em; }
.subtitle { color: var(--text-secondary); margin-top: 4px; }

/* Analytics */
.analytics-grid { display: grid; grid-template-columns: 250px 250px 1fr; gap: 24px; margin-bottom: 32px; }
.stat-card { background-color: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 12px; padding: 20px 24px; display: flex; align-items: center; gap: 16px; }
.stat-icon { width: 48px; height: 48px; border-radius: 12px; background-color: rgba(99, 102, 241, 0.1); color: var(--accent-primary); display: flex; align-items: center; justify-content: center; font-size: 1.5rem; }
.unread-icon { background-color: rgba(245, 158, 11, 0.1); color: var(--warning); }
.stat-details { display: flex; flex-direction: column; }
.stat-value { font-size: 1.75rem; font-weight: 700; line-height: 1; margin-bottom: 4px; }
.stat-label { font-size: 0.85rem; color: var(--text-secondary); font-weight: 500; text-transform: uppercase; letter-spacing: 0.05em; }
.chart-container { background-color: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 12px; padding: 16px; height: 120px; display: flex; align-items: center; justify-content: center; }

/* Table Controls */
.table-controls { background-color: rgba(99, 102, 241, 0.1); border: 1px solid var(--accent-primary); border-radius: 8px; padding: 12px 20px; margin-bottom: 16px; display: flex; align-items: center; justify-content: space-between; color: var(--accent-primary); font-weight: 600; font-size: 0.9rem; animation: slideDown 0.2s ease-out; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

/* Table */
.table-container { background-color: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 12px; overflow: hidden; }
.data-table { width: 100%; border-collapse: collapse; }
.data-table th, .data-table td { padding: 16px 20px; text-align: left; border-bottom: 1px solid var(--border-color); vertical-align: middle; }
.data-table th { background-color: rgba(0,0,0,0.2); font-weight: 600; color: var(--text-secondary); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; }
.data-table tbody tr { transition: background-color 0.2s; }
.data-table tbody tr:hover { background-color: rgba(255, 255, 255, 0.02); }
.data-table tbody tr.unread { background-color: rgba(245, 158, 11, 0.03); }
.data-table tbody tr.unread:hover { background-color: rgba(245, 158, 11, 0.06); }
.data-table tbody tr.selected { background-color: rgba(99, 102, 241, 0.05); }

/* Checkbox */
input[type="checkbox"] { appearance: none; width: 18px; height: 18px; border: 2px solid var(--text-secondary); border-radius: 4px; background-color: transparent; cursor: pointer; display: grid; place-content: center; transition: all 0.2s; }
input[type="checkbox"]::before { content: ""; width: 10px; height: 10px; transform: scale(0); transition: 120ms transform ease-in-out; box-shadow: inset 1em 1em white; background-color: white; transform-origin: center; clip-path: polygon(14% 44%, 0 65%, 50% 100%, 100% 16%, 80% 0%, 43% 62%); }
input[type="checkbox"]:checked { background-color: var(--accent-primary); border-color: var(--accent-primary); }
input[type="checkbox"]:checked::before { transform: scale(1); }

.status-badge { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; border-radius: 12px; font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; }
.status-unread, .status-pending { background-color: rgba(245, 158, 11, 0.1); color: var(--warning); border: 1px solid rgba(245, 158, 11, 0.2); }
.status-read, .status-results { background-color: rgba(16, 185, 129, 0.1); color: var(--success); border: 1px solid rgba(16, 185, 129, 0.2); }
.status-attempted { background-color: rgba(99, 102, 241, 0.1); color: var(--accent-primary); border: 1px solid rgba(99, 102, 241, 0.2); }
.status-retargeting { background-color: rgba(239, 68, 68, 0.1); color: var(--danger); border: 1px solid rgba(239, 68, 68, 0.2); }

.status-select { appearance: none; background-color: var(--bg-tertiary); border: 1px solid var(--border-color); color: var(--text-primary); padding: 4px 28px 4px 12px; border-radius: 8px; font-size: 0.85rem; font-family: inherit; font-weight: 600; outline: none; cursor: pointer; background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%2394a3b8%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E"); background-repeat: no-repeat; background-position: right 8px top 50%; background-size: 10px auto; transition: all 0.2s; text-transform: uppercase; letter-spacing: 0.05em; }
.status-select:focus { border-color: var(--accent-primary); }
.status-select.val-pending { color: var(--warning); border-color: rgba(245, 158, 11, 0.3); background-color: rgba(245, 158, 11, 0.05); }
.status-select.val-attempted { color: var(--accent-primary); border-color: rgba(99, 102, 241, 0.3); background-color: rgba(99, 102, 241, 0.05); }
.status-select.val-results { color: var(--success); border-color: rgba(16, 185, 129, 0.3); background-color: rgba(16, 185, 129, 0.05); }
.status-select.val-retargeting { color: var(--danger); border-color: rgba(239, 68, 68, 0.3); background-color: rgba(239, 68, 68, 0.05); }

.date-cell { white-space: nowrap; color: var(--text-secondary); font-size: 0.9rem; }
.data-cell { width: 100%; }
.data-preview { display: flex; flex-wrap: wrap; gap: 8px; }
.data-badge { background-color: var(--bg-tertiary); border: 1px solid var(--border-color); padding: 4px 10px; border-radius: 6px; font-size: 0.85rem; }
.data-badge strong { color: var(--text-secondary); margin-right: 4px; }

.actions-cell { white-space: nowrap; display: flex; gap: 8px; }
.btn-icon { width: 36px; height: 36px; border-radius: 8px; border: 1px solid var(--border-color); background: var(--bg-tertiary); color: var(--text-primary); cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.2s; }
.btn-icon:hover { background: var(--accent-primary); border-color: var(--accent-primary); }
.btn-icon.success:hover { background: var(--success); border-color: var(--success); }
.btn-icon.danger:hover { background: var(--danger); border-color: var(--danger); }

.empty-state { text-align: center; padding: 64px 24px; color: var(--text-secondary); }
.empty-state i { font-size: 3rem; margin-bottom: 16px; opacity: 0.5; }

/* Modal */
.modal-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background-color: rgba(0, 0, 0, 0.7); backdrop-filter: blur(4px); display: flex; align-items: center; justify-content: center; z-index: 1000; opacity: 0; pointer-events: none; transition: opacity 0.3s; }
.modal-overlay.active { opacity: 1; pointer-events: all; }
.modal { background-color: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 16px; width: 100%; max-width: 600px; max-height: 80vh; display: flex; flex-direction: column; box-shadow: 0 24px 48px rgba(0,0,0,0.5); transform: translateY(20px); transition: transform 0.3s; }
.modal-overlay.active .modal { transform: translateY(0); }
.modal-header { padding: 24px; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
.modal-header h2 { font-size: 1.25rem; }
.close-btn { background: none; border: none; color: var(--text-secondary); font-size: 1.5rem; cursor: pointer; transition: color 0.2s; }
.close-btn:hover { color: var(--text-primary); }
.modal-body { padding: 24px; overflow-y: auto; flex: 1; }
.detail-row { margin-bottom: 16px; background-color: var(--bg-main); padding: 16px; border-radius: 8px; border: 1px solid var(--border-color); }
.detail-label { color: var(--text-secondary); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 4px; font-weight: 600; }
.detail-value { font-size: 1rem; word-break: break-word; }
.modal-footer { padding: 20px 24px; border-top: 1px solid var(--border-color); display: flex; justify-content: flex-end; gap: 12px; background-color: var(--bg-secondary); border-radius: 0 0 16px 16px; }

/* Loader */
.loader-cell { text-align: center; padding: 48px !important; }
.spinner { width: 40px; height: 40px; border: 3px solid rgba(99, 102, 241, 0.2); border-radius: 50%; border-top-color: var(--accent-primary); animation: spin 1s ease-in-out infinite; margin: 0 auto; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Tab Sections */
.tab-section { display: none; animation: fadeIn 0.3s ease-out; }
.tab-section.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* Settings Grid */
.settings-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); gap: 24px; }
.settings-card { background-color: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 12px; padding: 24px; }
.settings-card h3 { margin-bottom: 24px; font-size: 1.1rem; color: var(--text-primary); display: flex; align-items: center; gap: 8px; }
.settings-card h3 i { color: var(--accent-primary); }
.setting-row { display: flex; justify-content: space-between; align-items: center; padding: 16px 0; border-bottom: 1px solid var(--border-color); }
.setting-row:last-child { border-bottom: none; padding-bottom: 0; }

.form-input { width: 100%; padding: 10px 16px; background-color: var(--bg-main); border: 1px solid var(--border-color); border-radius: 8px; color: var(--text-primary); font-family: inherit; font-size: 0.95rem; outline: none; transition: border-color 0.2s; }
.form-input:focus { border-color: var(--accent-primary); }

.password-wrapper { position: relative; display: flex; align-items: center; }
.password-toggle { position: absolute; right: 14px; cursor: pointer; color: var(--text-secondary); font-size: 1rem; transition: color 0.2s; }
.password-toggle:hover { color: var(--text-primary); }

/* Advanced Analytics */
.advanced-analytics-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 24px; }
.chart-card { background-color: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 12px; padding: 24px; }
.chart-card.full-width { grid-column: 1 / -1; }
.chart-card h3 { margin-bottom: 20px; font-size: 1.05rem; font-weight: 600; color: var(--text-secondary); }
.large-chart-container { height: 280px; width: 100%; }
.pie-chart-container { height: 280px; width: 100%; display: flex; justify-content: center; }

.activity-bars { display: flex; height: 100px; align-items: flex-end; gap: 8px; }
.activity-bar-col { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; height: 100%; gap: 8px; }
.activity-bar { width: 100%; background-color: var(--accent-primary); border-radius: 4px; transition: height 0.5s ease-out; opacity: 0.8; }
.activity-bar:hover { opacity: 1; }
.activity-label { font-size: 0.75rem; color: var(--text-secondary); }

/* Utilities */
.text-secondary { color: var(--text-secondary); font-size: 0.9rem; margin-top: 4px; }

/* Toggle Switch */
.toggle-switch { position: relative; display: inline-block; width: 50px; height: 26px; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: var(--bg-tertiary); transition: .3s; border-radius: 26px; border: 1px solid var(--border-color); }
.slider:before { position: absolute; content: ""; height: 18px; width: 18px; left: 3px; bottom: 3px; background-color: var(--text-secondary); transition: .3s; border-radius: 50%; }
input:checked + .slider { background-color: var(--accent-primary); border-color: var(--accent-primary); }
input:checked + .slider:before { transform: translateX(24px); background-color: white; }

/* Toast */
.toast { position: fixed; bottom: 24px; right: 24px; background-color: var(--bg-secondary); border: 1px solid var(--border-color); color: var(--text-primary); padding: 12px 24px; border-radius: 8px; box-shadow: 0 10px 25px rgba(0,0,0,0.5); font-weight: 500; transform: translateY(100px); opacity: 0; transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55); z-index: 2000; display: flex; align-items: center; gap: 12px; }
.toast.show { transform: translateY(0); opacity: 1; }

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
    .app-container { flex-direction: column; overflow-y: auto; height: 100vh; }
    
    .sidebar { width: 100%; height: auto; border-right: none; border-bottom: 1px solid var(--border-color); padding: 0; }
    .sidebar-header { justify-content: center; height: 60px; }
    .sidebar-nav { flex-direction: row; padding: 8px; overflow-x: auto; white-space: nowrap; gap: 8px; flex: none; -webkit-overflow-scrolling: touch; }
    .nav-item { flex: 0 0 auto; padding: 8px 12px; font-size: 0.85rem; }
    .sidebar-footer { display: none; } /* Hide bottom profile in mobile nav to save space */
    
    .main-content { overflow: visible; }
    .top-header { height: auto; padding: 16px; flex-direction: column; gap: 12px; }
    .header-search { width: 100%; }
    .header-actions { width: 100%; justify-content: space-between; }
    
    .content-wrapper { padding: 16px; }
    .page-header { flex-direction: column; align-items: flex-start; gap: 12px; }
    
    .analytics-grid { grid-template-columns: 1fr; gap: 16px; }
    .advanced-analytics-grid { grid-template-columns: 1fr; gap: 16px; }
    .settings-grid { grid-template-columns: 1fr; gap: 16px; }
    .setting-row { flex-direction: column; align-items: flex-start; gap: 12px; }
    
    .table-container { border-radius: 8px; overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .data-table { min-width: 800px; } /* Force scroll for tables on mobile */
    .table-controls { flex-direction: column; gap: 12px; align-items: stretch; }
    .table-controls div { flex-direction: column; }
    
    .modal { margin: 16px; width: auto; max-height: 90vh; }
    .modal-body { padding: 16px; }
}