/* Module 01 Dashboard - shared CSS design system (Functional Specification §21).
   Every module built on this Razor/Bootstrap stack from here on reuses this file rather than
   redeclaring its own tokens. */

:root {
    --surface: #f5f6fa;
    --surface-card: #ffffff;
    --border: #e2e5ec;
    --text-primary: #1c2333;
    --text-secondary: #5b6478;
    --text-muted: #8b93a7;
    --accent: #2f6fed;
    --accent-soft: #e8f0fe;
    --status-good: #1f9d55;
    --status-warning: #d97706;
    --status-critical: #dc2626;
    --sidebar-bg: #12172b;
    --sidebar-text: #b7bfd6;
    --sidebar-text-active: #ffffff;
    --sidebar-active-bg: rgba(255, 255, 255, 0.08);
    --radius: 12px;
    --radius-sm: 10px;
    --spacing-unit: 8px;
    --shadow-card: 0 1px 2px rgba(20, 24, 40, 0.04), 0 4px 12px rgba(20, 24, 40, 0.06);
    --transition-fast: 150ms ease;
}

[data-bs-theme="dark"] {
    --surface: #0f1320;
    --surface-card: #171c2c;
    --border: #262d42;
    --text-primary: #f0f2f8;
    --text-secondary: #a7b0c6;
    --text-muted: #6b7a98;
    --accent: #5b8def;
    --accent-soft: rgba(91, 141, 239, 0.15);
    --sidebar-bg: #0a0d18;
    --sidebar-active-bg: rgba(255, 255, 255, 0.06);
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.2), 0 4px 16px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

body {
    font-family: "Inter", "Segoe UI", system-ui, sans-serif;
    background: var(--surface);
    color: var(--text-primary);
    margin: 0;
}

.app-shell {
    display: flex;
    min-height: 100vh;
}

/* ---------- Sidebar ---------- */
.platform-sidebar {
    width: 260px;
    flex-shrink: 0;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 1.5);
    padding: calc(var(--spacing-unit) * 2.5) calc(var(--spacing-unit) * 2.5);
    font-weight: 600;
    color: #fff;
    font-size: 1.05rem;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 0 calc(var(--spacing-unit) * 1.5);
}

.nav-top-link {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 1.5);
    padding: calc(var(--spacing-unit) * 1.25) calc(var(--spacing-unit) * 1.5);
    border-radius: var(--radius-sm);
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-top-link i { width: 18px; text-align: center; }

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

.nav-top-link.active {
    background: var(--accent);
    color: #fff;
}

/* ---------- Main area ---------- */
.main-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.platform-topbar {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 2);
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3);
    background: var(--surface-card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.topbar-search {
    flex: 1;
    max-width: 420px;
    display: flex;
    align-items: center;
    gap: var(--spacing-unit);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: calc(var(--spacing-unit) * 0.75) calc(var(--spacing-unit) * 1.5);
    color: var(--text-muted);
}

.topbar-search input {
    border: none;
    background: transparent;
    outline: none;
    width: 100%;
    color: var(--text-primary);
}

.topbar-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 1.25);
}

.btn-icon {
    position: relative;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background var(--transition-fast);
}

.btn-icon:hover { background: var(--surface); }

.badge-dot {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--status-critical);
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 1.25);
    padding-left: calc(var(--spacing-unit) * 1.5);
    border-left: 1px solid var(--border);
}

.user-name { font-weight: 600; font-size: 0.9rem; }

.platform-breadcrumb {
    padding: calc(var(--spacing-unit) * 1.5) calc(var(--spacing-unit) * 3) 0;
}

.platform-content {
    padding: calc(var(--spacing-unit) * 3);
    flex: 1;
}

.platform-footer {
    display: flex;
    justify-content: space-between;
    padding: calc(var(--spacing-unit) * 2) calc(var(--spacing-unit) * 3);
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
}

/* ---------- KPI cards ---------- */
.kpi-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: calc(var(--spacing-unit) * 2);
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.kpi-card {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
    padding: calc(var(--spacing-unit) * 2);
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 0.75);
}

.kpi-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.kpi-value {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ---------- Chart / widget cards ---------- */
.chart-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: calc(var(--spacing-unit) * 2);
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.widget-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: calc(var(--spacing-unit) * 2);
}

.panel-card {
    background: var(--surface-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
    padding: calc(var(--spacing-unit) * 2);
}

.panel-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.panel-card canvas { max-height: 260px; }

.skeleton {
    background: linear-gradient(90deg, var(--border) 25%, var(--surface) 37%, var(--border) 63%);
    background-size: 400% 100%;
    animation: skeleton-shimmer 1.4s ease infinite;
    border-radius: var(--radius-sm);
    height: 1rem;
}

@keyframes skeleton-shimmer {
    0% { background-position: 100% 50%; }
    100% { background-position: 0 50%; }
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-badge.good { background: rgba(31, 157, 85, 0.12); color: var(--status-good); }
.status-badge.warning { background: rgba(217, 119, 6, 0.12); color: var(--status-warning); }
.status-badge.critical { background: rgba(220, 38, 38, 0.12); color: var(--status-critical); }

.activity-feed { list-style: none; margin: 0; padding: 0; }

.activity-feed li {
    display: flex;
    gap: calc(var(--spacing-unit) * 1.5);
    padding: calc(var(--spacing-unit) * 1.25) 0;
    border-bottom: 1px solid var(--border);
    font-size: 0.88rem;
}

.activity-feed li:last-child { border-bottom: none; }
.activity-time { color: var(--text-muted); font-size: 0.78rem; white-space: nowrap; }

@media (max-width: 1200px) {
    .kpi-grid { grid-template-columns: repeat(3, 1fr); }
    .widget-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 991px) {
    .chart-grid { grid-template-columns: 1fr; }
    .platform-sidebar {
        position: fixed;
        left: -280px;
        z-index: 1050;
        transition: left var(--transition-fast);
    }
    .platform-sidebar.open { left: 0; }
}

@media (max-width: 767px) {
    .kpi-grid { grid-template-columns: repeat(2, 1fr); }
    .widget-grid { grid-template-columns: 1fr; }
}