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

/* ═══════════════════════════════════════════
   RESET & BASE
   ═══════════════════════════════════════════ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg-primary: #0a0a0f;
    --bg-card: rgba(255,255,255,0.025);
    --bg-card-hover: rgba(255,255,255,0.04);
    --bg-sidebar: rgba(10,10,18,0.95);
    --border: rgba(255,255,255,0.06);
    --border-hover: rgba(255,255,255,0.12);
    --text-primary: #f0f0f5;
    --text-secondary: rgba(255,255,255,0.55);
    --text-muted: rgba(255,255,255,0.3);
    --accent: #8b0000;
    --accent-light: #c0392b;
    --accent-glow: rgba(139,0,0,0.25);
    --green: #27ae60;
    --green-bg: rgba(39,174,96,0.1);
    --red: #e74c3c;
    --red-bg: rgba(231,76,60,0.1);
    --yellow: #f39c12;
    --yellow-bg: rgba(243,156,18,0.1);
    --blue: #3498db;
    --blue-bg: rgba(52,152,219,0.1);
    --purple: #9b59b6;
    --sidebar-width: 260px;
    --header-height: 64px;
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.5;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ═══════════════════════════════════════════
   SIDEBAR
   ═══════════════════════════════════════════ */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    backdrop-filter: blur(20px);
    transition: transform 0.3s ease;
}

.sidebar-brand {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 12px;
}
.sidebar-brand .brand-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
    box-shadow: 0 4px 16px var(--accent-glow);
}
.sidebar-brand h2 {
    font-size: 15px;
    font-weight: 700;
    letter-spacing: -0.3px;
    white-space: nowrap;
}
.sidebar-brand span {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    overflow-y: auto;
}
.nav-section-title {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
    padding: 16px 12px 8px;
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13.5px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    margin-bottom: 2px;
    position: relative;
}
.nav-item:hover {
    background: rgba(255,255,255,0.04);
    color: var(--text-primary);
}
.nav-item.active {
    background: var(--accent-glow);
    color: #fff;
}
.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--accent-light);
    border-radius: 0 3px 3px 0;
}
.nav-item .nav-icon {
    width: 20px;
    text-align: center;
    font-size: 16px;
    flex-shrink: 0;
}
.nav-badge {
    margin-left: auto;
    background: var(--red);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 10px;
    min-width: 20px;
    text-align: center;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.sidebar-footer .user-info {
    font-size: 13px;
    color: var(--text-secondary);
}
.btn-logout {
    background: rgba(231,76,60,0.1);
    border: 1px solid rgba(231,76,60,0.2);
    color: var(--red);
    font-size: 12px;
    padding: 6px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 500;
    transition: all var(--transition);
}
.btn-logout:hover {
    background: rgba(231,76,60,0.2);
}

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

.header {
    position: sticky;
    top: 0;
    z-index: 50;
    height: var(--header-height);
    background: rgba(10,10,15,0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
}
.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}
.header-left h1 {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -0.3px;
}
.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.refresh-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-muted);
}
.refresh-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--green);
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.btn-refresh {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-family: inherit;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}
.btn-refresh:hover {
    background: rgba(255,255,255,0.08);
    color: var(--text-primary);
    border-color: var(--border-hover);
}
.btn-refresh.loading .refresh-spin {
    animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 22px;
    cursor: pointer;
    padding: 4px;
}

/* ═══════════════════════════════════════════
   PAGE CONTENT
   ═══════════════════════════════════════════ */
.page-content {
    padding: 28px 32px;
}

.section {
    display: none;
    animation: fadeIn 0.35s ease-out;
}
.section.active { display: block; }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ═══════════════════════════════════════════
   KPI CARDS
   ═══════════════════════════════════════════ */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 28px;
}

.kpi-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.kpi-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}
.kpi-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--accent), transparent);
    opacity: 0;
    transition: opacity var(--transition);
}
.kpi-card:hover::after { opacity: 1; }

.kpi-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    margin-bottom: 8px;
}
.kpi-value {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1.1;
    margin-bottom: 6px;
}
.kpi-trend {
    font-size: 12px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px;
    border-radius: 6px;
}
.kpi-trend.up { color: var(--green); background: var(--green-bg); }
.kpi-trend.down { color: var(--red); background: var(--red-bg); }
.kpi-trend.neutral { color: var(--text-muted); background: rgba(255,255,255,0.05); }

.kpi-icon {
    position: absolute;
    top: 16px;
    right: 16px;
    font-size: 24px;
    opacity: 0.15;
}

/* ═══════════════════════════════════════════
   CHART CARDS
   ═══════════════════════════════════════════ */
.chart-grid {
    display: grid;
    gap: 20px;
    margin-bottom: 28px;
}
.chart-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.chart-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }

.chart-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: all var(--transition);
}
.chart-card:hover {
    border-color: var(--border-hover);
}
.chart-card h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.chart-card h3 .chart-subtitle {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 400;
}
.chart-card canvas {
    max-height: 280px;
}

/* ═══════════════════════════════════════════
   DATA TABLES
   ═══════════════════════════════════════════ */
.table-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 28px;
}
.table-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 24px;
    border-bottom: 1px solid var(--border);
}
.table-header h3 {
    font-size: 15px;
    font-weight: 600;
}
.table-search {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 12px;
    color: var(--text-primary);
    font-size: 13px;
    font-family: inherit;
    outline: none;
    width: 220px;
    transition: all var(--transition);
}
.table-search:focus {
    border-color: rgba(139,0,0,0.4);
    box-shadow: 0 0 0 3px rgba(139,0,0,0.1);
}
.table-search::placeholder { color: var(--text-muted); }

.data-table {
    width: 100%;
    border-collapse: collapse;
}
.data-table th {
    padding: 12px 20px;
    text-align: left;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    user-select: none;
    white-space: nowrap;
    transition: color var(--transition);
}
.data-table th:hover { color: var(--text-secondary); }
.data-table th.sort-asc::after { content: ' ▲'; font-size: 9px; }
.data-table th.sort-desc::after { content: ' ▼'; font-size: 9px; }
.data-table th.numeric { text-align: right; }

.data-table td {
    padding: 12px 20px;
    font-size: 13.5px;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(255,255,255,0.03);
    transition: background var(--transition);
}
.data-table tr:hover td {
    background: rgba(255,255,255,0.02);
}
.data-table td.numeric {
    text-align: right;
    font-variant-numeric: tabular-nums;
    font-weight: 600;
    color: var(--text-primary);
}
.data-table td.positive { color: var(--green); }
.data-table td.negative { color: var(--red); }

.table-pagination {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    border-top: 1px solid var(--border);
    font-size: 12px;
    color: var(--text-muted);
}
.table-pagination button {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-family: inherit;
    font-size: 12px;
    transition: all var(--transition);
}
.table-pagination button:hover:not(:disabled) {
    background: rgba(255,255,255,0.08);
}
.table-pagination button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* ═══════════════════════════════════════════
   BADGES & TAGS
   ═══════════════════════════════════════════ */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 6px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.badge-green { color: var(--green); background: var(--green-bg); }
.badge-red { color: var(--red); background: var(--red-bg); }
.badge-yellow { color: var(--yellow); background: var(--yellow-bg); }
.badge-blue { color: var(--blue); background: var(--blue-bg); }
.badge-purple { color: var(--purple); background: rgba(155,89,182,0.1); }

/* ═══════════════════════════════════════════
   ALERTS
   ═══════════════════════════════════════════ */
.alert-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.alert-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 22px;
    display: flex;
    align-items: flex-start;
    gap: 14px;
    transition: all var(--transition);
}
.alert-item:hover {
    border-color: var(--border-hover);
}
.alert-severity {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}
.alert-severity.high { background: var(--red-bg); }
.alert-severity.medium { background: var(--yellow-bg); }
.alert-severity.low { background: var(--blue-bg); }
.alert-severity.info { background: var(--green-bg); }
.alert-title {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 2px;
}
.alert-message {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ═══════════════════════════════════════════
   SEGMENT CARDS (RFM)
   ═══════════════════════════════════════════ */
.segment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    margin-bottom: 28px;
}
.segment-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: all var(--transition);
}
.segment-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}
.segment-name {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 4px;
}
.segment-stats {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 12px;
}
.segment-bar {
    height: 4px;
    background: rgba(255,255,255,0.06);
    border-radius: 2px;
    overflow: hidden;
}
.segment-bar-fill {
    height: 100%;
    border-radius: 2px;
    transition: width 0.8s ease;
}

/* ═══════════════════════════════════════════
   SKELETON LOADING
   ═══════════════════════════════════════════ */
.skeleton {
    background: linear-gradient(90deg, rgba(255,255,255,0.03) 25%, rgba(255,255,255,0.06) 50%, rgba(255,255,255,0.03) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}
.skeleton-kpi { height: 100px; }
.skeleton-chart { height: 320px; }
.skeleton-table { height: 400px; }

/* ═══════════════════════════════════════════
   TOAST NOTIFICATIONS
   ═══════════════════════════════════════════ */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.toast {
    background: rgba(20,20,30,0.95);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px 20px;
    font-size: 13px;
    color: var(--text-primary);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
    animation: toastIn 0.3s ease;
    max-width: 360px;
}
.toast.removing { animation: toastOut 0.3s ease forwards; }
@keyframes toastIn {
    from { opacity: 0; transform: translateY(20px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes toastOut {
    to { opacity: 0; transform: translateY(-10px) scale(0.95); }
}

/* ═══════════════════════════════════════════
   SCROLL ANIMATION
   ═══════════════════════════════════════════ */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.5s ease;
}
.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ═══════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════ */
@media (max-width: 1100px) {
    .chart-grid.cols-2, .chart-grid.cols-3 {
        grid-template-columns: 1fr;
    }
}
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
    }
    .menu-toggle {
        display: block;
    }
    .page-content {
        padding: 20px 16px;
    }
    .kpi-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .header {
        padding: 0 16px;
    }
}
@media (max-width: 480px) {
    .kpi-grid {
        grid-template-columns: 1fr;
    }
}