/**
 * APEX IT Solutions - Lead Management CRM
 * Custom Professional Theme & Responsive Layout Styles
 * Brand: APEX IT Solutions (Navy / Slate / Primary Blue / Teal)
 */

:root {
    --apex-primary: #2563eb;
    --apex-primary-hover: #1d4ed8;
    --apex-primary-light: #eff6ff;
    --apex-teal: #0ea5e9;
    --apex-teal-dark: #0284c7;
    --apex-sidebar-bg: #0f172a;
    --apex-sidebar-hover: #1e293b;
    --apex-sidebar-active: #1d4ed8;
    --apex-sidebar-text: #94a3b8;
    --apex-sidebar-text-active: #ffffff;
    --apex-body-bg: #f8fafc;
    --apex-card-bg: #ffffff;
    --apex-border-color: #e2e8f0;
    --apex-text-main: #0f172a;
    --apex-text-muted: #64748b;
    --sidebar-width: 260px;
    --topbar-height: 64px;
}

body {
    background-color: var(--apex-body-bg);
    color: var(--apex-text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 0.9375rem;
    overflow-x: hidden;
}

/* -------------------------------------------------------------------------- */
/* Layout Structure                                                           */
/* -------------------------------------------------------------------------- */

.app-wrapper {
    display: flex;
    min-height: 100vh;
    width: 100%;
}

/* Sidebar */
.app-sidebar {
    width: var(--sidebar-width);
    background-color: var(--apex-sidebar-bg);
    color: var(--apex-sidebar-text);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 1040;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 2px 0 8px rgba(0, 0, 0, 0.15);
}

.sidebar-brand {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    padding: 0 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    color: #ffffff;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: -0.02em;
}

.sidebar-brand img, .sidebar-brand svg {
    margin-right: 0.65rem;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 0.75rem;
}

.nav-category {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: #64748b;
    padding: 0.75rem 0.75rem 0.35rem 0.75rem;
}

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    padding: 0.6rem 0.85rem;
    color: var(--apex-sidebar-text);
    border-radius: 0.375rem;
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.15s ease-in-out;
    margin-bottom: 0.2rem;
    text-decoration: none;
}

.sidebar-nav .nav-link:hover {
    color: #ffffff;
    background-color: var(--apex-sidebar-hover);
}

.sidebar-nav .nav-link.active {
    color: #ffffff;
    background-color: var(--apex-primary);
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.3);
}

.sidebar-nav .nav-link svg, .sidebar-nav .nav-link i {
    width: 1.15rem;
    height: 1.15rem;
    margin-right: 0.75rem;
    flex-shrink: 0;
}

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.75rem;
    color: #64748b;
}

/* Main Content Area */
.app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 100vh;
    transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Topbar */
.app-topbar {
    height: var(--topbar-height);
    background-color: #ffffff;
    border-bottom: 1px solid var(--apex-border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    position: sticky;
    top: 0;
    z-index: 1020;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.sidebar-toggle-btn {
    background: none;
    border: 1px solid var(--apex-border-color);
    color: var(--apex-text-main);
    padding: 0.4rem 0.65rem;
    border-radius: 0.375rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.15s;
}

.sidebar-toggle-btn:hover {
    background-color: #f1f5f9;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.65rem;
    border-radius: 2rem;
    background-color: #f1f5f9;
    font-size: 0.85rem;
    font-weight: 500;
}

.user-avatar-circle {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: var(--apex-primary);
    color: #ffffff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
}

/* Content Container */
.app-content {
    flex: 1;
    padding: 1.75rem 1.75rem 2.5rem 1.75rem;
}

/* Page Header Component */
.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-header-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--apex-text-main);
    margin: 0;
    line-height: 1.25;
}

.page-header-subtitle {
    font-size: 0.875rem;
    color: var(--apex-text-muted);
    margin-top: 0.25rem;
    margin-bottom: 0;
}

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

/* Breadcrumbs */
.breadcrumb-container .breadcrumb {
    margin-bottom: 0;
    font-size: 0.825rem;
}

.breadcrumb-container .breadcrumb-item a {
    color: var(--apex-text-muted);
    text-decoration: none;
}

.breadcrumb-container .breadcrumb-item.active {
    color: var(--apex-primary);
    font-weight: 600;
}

/* Cards */
.card {
    border: 1px solid var(--apex-border-color);
    border-radius: 0.5rem;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.05), 0 1px 2px -1px rgba(0, 0, 0, 0.05);
    background-color: var(--apex-card-bg);
}

.card-header {
    background-color: #ffffff;
    border-bottom: 1px solid var(--apex-border-color);
    padding: 1rem 1.25rem;
    font-weight: 600;
    font-size: 0.95rem;
}

/* Footer */
.app-footer {
    padding: 1rem 1.75rem;
    background-color: #ffffff;
    border-top: 1px solid var(--apex-border-color);
    font-size: 0.8125rem;
    color: var(--apex-text-muted);
}

/* -------------------------------------------------------------------------- */
/* Responsive & Collapsed State                                              */
/* -------------------------------------------------------------------------- */

@media (max-width: 991.98px) {
    .app-sidebar {
        transform: translateX(-100%);
    }

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

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

    .sidebar-backdrop {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(15, 23, 42, 0.5);
        z-index: 1030;
        display: none;
    }

    .sidebar-backdrop.show {
        display: block;
    }
}

/* Collapsed Sidebar on Desktop */
body.sidebar-collapsed .app-sidebar {
    transform: translateX(-100%);
}

body.sidebar-collapsed .app-main {
    margin-left: 0;
}

/* -------------------------------------------------------------------------- */
/* Phase 3: Dashboard & CRM Components                                       */
/* -------------------------------------------------------------------------- */

/* Navigation Phase Badges */
.nav-phase-badge {
    font-size: 0.65rem;
    font-weight: 600;
    padding: 0.2rem 0.45rem;
    letter-spacing: 0.03em;
}

.nav-link-future {
    opacity: 0.78;
    cursor: pointer;
}

.nav-link-future:hover {
    opacity: 1;
}

/* KPI Cards */
.kpi-card {
    border: 1px solid var(--apex-border-color);
    border-radius: 0.5rem;
    background-color: #ffffff;
    padding: 1.25rem;
    transition: transform 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    position: relative;
    overflow: hidden;
}

.kpi-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.08);
}

.kpi-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.kpi-card-title {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--apex-text-muted);
    margin: 0;
}

.kpi-card-icon {
    width: 38px;
    height: 38px;
    border-radius: 0.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    flex-shrink: 0;
}

.kpi-card-value {
    font-size: 1.85rem;
    font-weight: 700;
    color: var(--apex-text-main);
    line-height: 1.1;
    margin-bottom: 0.35rem;
}

.kpi-card-subtext {
    font-size: 0.75rem;
    color: var(--apex-text-muted);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

/* Icon Palette Variants */
.icon-primary { background-color: #eff6ff; color: #2563eb; }
.icon-success { background-color: #ecfdf5; color: #10b981; }
.icon-warning { background-color: #fffbeb; color: #f59e0b; }
.icon-danger  { background-color: #fef2f2; color: #ef4444; }
.icon-info    { background-color: #f0f9ff; color: #0284c7; }
.icon-purple  { background-color: #f5f3ff; color: #7c3aed; }
.icon-slate   { background-color: #f1f5f9; color: #475569; }

/* Chart Containers */
.chart-container {
    position: relative;
    height: 290px;
    width: 100%;
}

.chart-container-sm {
    position: relative;
    height: 240px;
    width: 100%;
}

/* Empty States */
.empty-state {
    padding: 3rem 1.5rem;
    text-align: center;
}

.empty-state-sm {
    padding: 1.75rem 1rem;
    text-align: center;
}

.empty-state-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background-color: #f1f5f9;
    color: #64748b;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.empty-state-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--apex-text-main);
    margin-bottom: 0.35rem;
}

.empty-state-text {
    font-size: 0.825rem;
    color: var(--apex-text-muted);
    max-width: 420px;
    margin: 0 auto;
}

/* Quick Action Buttons */
.quick-action-item {
    display: flex;
    align-items: center;
    padding: 0.85rem 1rem;
    border: 1px solid var(--apex-border-color);
    border-radius: 0.5rem;
    background-color: #ffffff;
    color: var(--apex-text-main);
    text-decoration: none;
    transition: all 0.15s ease-in-out;
}

.quick-action-item:hover {
    background-color: #f8fafc;
    border-color: #cbd5e1;
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.quick-action-item.disabled-action {
    opacity: 0.7;
    cursor: default;
}

.quick-action-item.disabled-action:hover {
    transform: none;
    background-color: #ffffff;
    border-color: var(--apex-border-color);
    box-shadow: none;
}

/* -------------------------------------------------------------------------- */
/* Phase 4: Kanban Pipeline Board Styles                                     */
/* -------------------------------------------------------------------------- */

.kanban-board {
    display: flex;
    gap: 1.25rem;
    overflow-x: auto;
    padding-bottom: 1.5rem;
    align-items: flex-start;
}

.kanban-column {
    flex: 0 0 310px;
    background-color: #f8fafc;
    border-radius: 0.5rem;
    border: 1px solid var(--apex-border-color);
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 220px);
}

.kanban-column-header {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--apex-border-color);
    background-color: #ffffff;
    border-top-left-radius: 0.5rem;
    border-top-right-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.kanban-column-body {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem;
    min-height: 280px;
    transition: background-color 0.15s;
}

.kanban-column-body.drag-over {
    background-color: #eff6ff;
    outline: 2px dashed #2563eb;
    outline-offset: -4px;
}

.kanban-card {
    background-color: #ffffff;
    border-radius: 0.375rem;
    border: 1px solid var(--apex-border-color);
    padding: 0.85rem;
    margin-bottom: 0.75rem;
    cursor: grab;
    transition: transform 0.15s, box-shadow 0.15s;
}

.kanban-card:active {
    cursor: grabbing;
}

.kanban-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
}

.kanban-card.dragging {
    opacity: 0.4;
}