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

:root {
    --primary: #2d2f3c;
    --primary-light: #b8bbd0;
    --bg: #f0f2f5;
    --card: #ffffff;
    --card-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
    --card-radius: 12px;
    --positive: #22c55e;
    --negative: #ef4444;
    --warning: #f59e0b;
    --text: #1a1a2e;
    --text-secondary: #666;
    --border: #e5e7eb;
    --sidebar-width: 56px;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    font-size: 14px;
}

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

/* === Sidebar === */
.sidebar {
    width: var(--sidebar-width);
    background: var(--primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 12px 0;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
}

.sidebar-logo {
    width: 36px;
    height: 36px;
    background: #fff;
    color: var(--primary);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    margin-bottom: 20px;
}

.nav-item {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    margin: 2px 0;
    text-decoration: none;
    font-size: 18px;
    transition: background 0.15s;
    position: relative;
}

.nav-item:hover {
    background: rgba(255, 255, 255, 0.12);
}

.nav-item.active {
    background: rgba(255, 255, 255, 0.2);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: -8px;
    width: 3px;
    height: 20px;
    background: #fff;
    border-radius: 0 2px 2px 0;
}

.nav-spacer {
    flex: 1;
}

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

/* === Topbar === */
.topbar {
    background: var(--card);
    padding: 12px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 50;
}

.page-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
}

/* === Content Area === */
.content-area {
    padding: 24px;
}

/* === Period Filter === */
.period-filter {
    display: flex;
    align-items: center;
    gap: 16px;
}

.period-pills {
    display: flex;
    gap: 4px;
    background: var(--bg);
    border-radius: 8px;
    padding: 3px;
}

.pill {
    padding: 5px 12px;
    border: none;
    background: transparent;
    border-radius: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s;
    font-family: inherit;
}

.pill:hover {
    color: var(--text);
}

.pill.active {
    background: var(--card);
    color: var(--text);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.08);
    font-weight: 500;
}

.period-nav select {
    padding: 5px 8px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    font-family: inherit;
    color: var(--text);
    background: var(--card);
    cursor: pointer;
}

.period-nav {
    display: flex;
    gap: 8px;
}

/* === KPI Grid === */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

@media (max-width: 1024px) {
    .kpi-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .kpi-grid {
        grid-template-columns: 1fr;
    }
}

/* === KPI Card === */
.kpi-card {
    background: var(--card);
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
    padding: 20px;
}

.kpi-label {
    font-size: 12px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.kpi-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--text);
}

.kpi-change {
    font-size: 12px;
    margin-top: 4px;
}

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

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

.kpi-change.warning {
    color: var(--warning);
}

/* === Card === */
.card {
    background: var(--card);
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
    padding: 20px;
    margin-bottom: 16px;
}

.card h2 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 16px;
}

/* === Chart Card === */
.chart-card {
    background: var(--card);
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
    padding: 20px;
    margin-bottom: 16px;
}

.chart-card h3 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 12px;
}

/* === Data Table === */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    text-align: left;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    padding: 8px 12px;
    border-bottom: 2px solid var(--border);
    cursor: pointer;
    user-select: none;
}

.data-table th:hover {
    color: var(--text);
}

.data-table td {
    padding: 10px 12px;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
}

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

.data-table .num {
    text-align: right;
    font-variant-numeric: tabular-nums;
}

/* === Alert Item === */
.alert-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 0;
    border-bottom: 1px solid var(--border);
}

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

.alert-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-top: 5px;
    flex-shrink: 0;
}

.alert-dot.red { background: var(--negative); }
.alert-dot.yellow { background: var(--warning); }
.alert-dot.green { background: var(--positive); }

.alert-text {
    font-size: 13px;
    line-height: 1.4;
}

/* === Flash Messages === */
.flash-messages {
    padding: 12px 24px 0;
}

.flash {
    padding: 10px 16px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 8px;
}

.flash-error {
    background: #fef2f2;
    color: var(--negative);
    border: 1px solid #fecaca;
}

.flash-success {
    background: #f0fdf4;
    color: var(--positive);
    border: 1px solid #bbf7d0;
}

.flash-info {
    background: #eff6ff;
    color: #2563eb;
    border: 1px solid #bfdbfe;
}

/* === Login === */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--bg);
}

.login-card {
    background: var(--card);
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
    padding: 40px;
    width: 100%;
    max-width: 380px;
    text-align: center;
}

.login-logo {
    width: 48px;
    height: 48px;
    background: var(--primary);
    color: #fff;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 22px;
    margin: 0 auto 16px;
}

.login-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 24px;
}

.login-form {
    text-align: left;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 4px;
    color: var(--text-secondary);
}

.form-group input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.15s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(45, 47, 60, 0.1);
}

/* === Buttons === */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.15s;
}

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

.btn-primary:hover {
    background: #3d3f52;
}

.btn-full {
    width: 100%;
    margin-top: 8px;
}

/* === Placeholder === */
.placeholder-text {
    color: var(--text-secondary);
    font-style: italic;
    padding: 20px 0;
}

/* === Grid Layouts === */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

@media (max-width: 768px) {
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
}