/* =================================================================
   BULKANO DESIGN SYSTEM — bk-ui.css  (v2: with layout chrome)
   Location: /Styles/bk-ui.css
   Replaces v1. Adds .bk-topbar, .bk-sidebar, .bk-nav-* for masters.
   ================================================================= */

/* =========================================================
   DESIGN TOKENS
   ========================================================= */
:root {
    /* Brand */
    --bk-brand: #b01e1c;
    --bk-brand-hover: #8e1917;
    --bk-brand-active: #6d1212;
    --bk-brand-tint: rgba(176, 30, 28, 0.08);
    --bk-brand-tint-strong: rgba(176, 30, 28, 0.14);
    --bk-brand-ring: rgba(176, 30, 28, 0.24);

    --bk-accent: #3c7993;
    --bk-accent-hover: #2f5f74;

    /* Grayscale — 11 stops */
    --bk-gray-0:   #ffffff;
    --bk-gray-50:  #fafafa;
    --bk-gray-100: #f4f4f5;
    --bk-gray-200: #e5e5e5;
    --bk-gray-300: #d4d4d4;
    --bk-gray-400: #a3a3a3;
    --bk-gray-500: #737373;
    --bk-gray-600: #525252;
    --bk-gray-700: #404040;
    --bk-gray-800: #262626;
    --bk-gray-900: #0a0a0a;

    /* Semantic colors */
    --bk-success:     #10b981;
    --bk-success-bg:  #ecfdf5;
    --bk-success-text: #047857;
    --bk-warning:     #f59e0b;
    --bk-warning-bg:  #fffbeb;
    --bk-warning-text: #92400e;
    --bk-danger:      #ef4444;
    --bk-danger-bg:   #fef2f2;
    --bk-danger-text: #991b1b;
    --bk-info:        #3b82f6;
    --bk-info-bg:     #eff6ff;
    --bk-info-text:   #1e40af;

    /* Spacing — 4px grid */
    --bk-s-1:  4px;
    --bk-s-2:  8px;
    --bk-s-3:  12px;
    --bk-s-4:  16px;
    --bk-s-5:  20px;
    --bk-s-6:  24px;
    --bk-s-8:  32px;
    --bk-s-10: 40px;
    --bk-s-12: 48px;
    --bk-s-16: 64px;

    /* Radius */
    --bk-r-sm: 4px;
    --bk-r:    6px;
    --bk-r-md: 8px;
    --bk-r-lg: 12px;
    --bk-r-xl: 16px;
    --bk-r-pill: 999px;

    /* Typography */
    --bk-font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --bk-font-mono: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;

    /* Borders */
    --bk-border: 1px solid var(--bk-gray-200);
    --bk-border-strong: 1px solid var(--bk-gray-300);

    /* Focus ring */
    --bk-ring: 0 0 0 3px var(--bk-brand-ring);

    /* Transitions */
    --bk-t-fast: 120ms ease;
    --bk-t: 150ms ease;

    /* Layout (for topbar + sidebar chrome) */
    --bk-sidebar-w: 240px;
    --bk-topbar-h: 60px;

    /* ========================================================
       LEGACY ALIASES — keep old pages (Developers.aspx, etc.)
       working while they still reference var(--gray-*), var(--brand), etc.
       Remove these once all pages use the --bk-* prefix.
       ======================================================== */
    --brand:           var(--bk-brand);
    --brand-hover:     var(--bk-brand-hover);
    --brand-active:    var(--bk-brand-active);
    --brand-tint:      var(--bk-brand-tint);
    --gray-0:          var(--bk-gray-0);
    --gray-50:         var(--bk-gray-50);
    --gray-100:        var(--bk-gray-100);
    --gray-200:        var(--bk-gray-200);
    --gray-300:        var(--bk-gray-300);
    --gray-400:        var(--bk-gray-400);
    --gray-500:        var(--bk-gray-500);
    --gray-600:        var(--bk-gray-600);
    --gray-700:        var(--bk-gray-700);
    --gray-800:        var(--bk-gray-800);
    --gray-900:        var(--bk-gray-900);
    --success:         var(--bk-success);
    --success-bg:      var(--bk-success-bg);
    --warning:         var(--bk-warning);
    --warning-bg:      var(--bk-warning-bg);
    --danger:          var(--bk-danger);
    --danger-bg:       var(--bk-danger-bg);
    --info:            var(--bk-info);
    --info-bg:         var(--bk-info-bg);
    --radius:          var(--bk-r);
    --radius-sm:       var(--bk-r-sm);
    --radius-md:       var(--bk-r-md);
    --radius-lg:       var(--bk-r-lg);
    --font-sans:       var(--bk-font-sans);
    --font-mono:       var(--bk-font-mono);
}

/* =========================================================
   GLOBAL HTML/BODY (for master page use)
   ========================================================= */
html, body {
    margin: 0;
    padding: 0;
    height: 100%;
}
.bk-app-body {
    font-family: var(--bk-font-sans);
    font-size: 14px;
    line-height: 1.5;
    color: var(--bk-gray-900);
    background: var(--bk-gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    margin: 0;
    padding: 0;
}

/* =========================================================
   TOPBAR (used by all role masters)
   ========================================================= */
.bk-topbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: var(--bk-topbar-h);
    background: var(--bk-gray-0);
    border-bottom: var(--bk-border);
    display: flex;
    align-items: center;
    padding: 0 24px;
    z-index: 200;
}
.bk-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    width: calc(var(--bk-sidebar-w) - 24px);
    padding-right: 12px;
    text-decoration: none;
    color: inherit;
}
.bk-brand-logo {
    width: 30px; height: 30px;
    background: var(--bk-brand);
    border-radius: 7px;
    display: grid; place-items: center;
    color: white;
    font-weight: 600;
    font-size: 14px;
    letter-spacing: -0.02em;
}
.bk-brand-name {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--bk-gray-900);
}
.bk-brand-name span { color: var(--bk-brand); }

.bk-topbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: auto;
}

/* Balance chip */
.bk-balance-chip {
    display: flex;
    align-items: center;
    gap: 7px;
    background: var(--bk-gray-100);
    border: 1px solid var(--bk-gray-200);
    padding: 6px 12px;
    border-radius: 18px;
    font-size: 12px;
    font-weight: 500;
}
.bk-balance-chip .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--bk-success); }
.bk-balance-chip .amt { font-variant-numeric: tabular-nums; color: var(--bk-gray-900); }

/* Icon button (topbar helper) */
.bk-icon-btn {
    width: 32px; height: 32px;
    border-radius: 6px;
    display: grid; place-items: center;
    color: var(--bk-gray-500);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: background var(--bk-t-fast), color var(--bk-t-fast);
    text-decoration: none;
}
.bk-icon-btn:hover { background: var(--bk-gray-100); color: var(--bk-gray-900); }
.bk-icon-btn svg { width: 18px; height: 18px; }

/* User chip (avatar + name + chevron) */
.bk-user-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 10px 4px 4px;
    border-radius: 18px;
    transition: background var(--bk-t-fast);
    cursor: pointer;
    border: none;
    background: transparent;
    text-decoration: none;
    color: inherit;
}
.bk-user-chip:hover { background: var(--bk-gray-100); text-decoration: none; }
.bk-avatar {
    width: 28px; height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--bk-accent), #5a9bb3);
    color: white;
    display: grid; place-items: center;
    font-size: 11px;
    font-weight: 600;
}
.bk-user-name {
    font-size: 13px;
    font-weight: 500;
    max-width: 160px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--bk-gray-900);
}
.bk-chev { width: 14px; height: 14px; color: var(--bk-gray-400); }

/* Sign-out (wraps ASP.NET LoginStatus) */
.bk-signout a {
    font-size: 13px;
    color: var(--bk-gray-600);
    padding: 6px 12px;
    border-radius: 6px;
    transition: background var(--bk-t-fast), color var(--bk-t-fast);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
}
.bk-signout a:hover { background: var(--bk-gray-100); color: var(--bk-gray-900); text-decoration: none; }

/* Mobile hamburger */
.bk-hamburger { display: none; margin-right: 8px; }

/* =========================================================
   SIDEBAR (used by all role masters)
   ========================================================= */
.bk-sidebar {
    position: fixed;
    top: var(--bk-topbar-h);
    bottom: 0; left: 0;
    width: var(--bk-sidebar-w);
    background: var(--bk-gray-0);
    border-right: var(--bk-border);
    overflow-y: auto;
    padding: 20px 12px 24px;
    transition: transform 0.2s;
    z-index: 150;
}
.bk-sidebar-backdrop {
    display: none;
    position: fixed;
    top: var(--bk-topbar-h); left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.3);
    z-index: 140;
}

.bk-nav-group { margin-bottom: 20px; }
.bk-nav-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--bk-gray-400);
    padding: 0 12px 8px;
}
.bk-nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 12px;
    border-radius: 6px;
    font-size: 13px;
    color: var(--bk-gray-700);
    font-weight: 400;
    position: relative;
    transition: background var(--bk-t-fast), color var(--bk-t-fast);
    text-decoration: none;
}
.bk-nav-item:hover { background: var(--bk-gray-100); color: var(--bk-gray-900); text-decoration: none; }
.bk-nav-item svg { width: 16px; height: 16px; color: var(--bk-gray-500); flex-shrink: 0; }
.bk-nav-item.active {
    background: var(--bk-brand-tint);
    color: var(--bk-brand);
    font-weight: 500;
}
.bk-nav-item.active svg { color: var(--bk-brand); }
.bk-nav-item.active::before {
    content: '';
    position: absolute;
    left: -12px;
    top: 6px; bottom: 6px;
    width: 3px;
    background: var(--bk-brand);
    border-radius: 0 2px 2px 0;
}
.bk-nav-badge {
    margin-left: auto;
    font-size: 9px;
    padding: 2px 6px;
    background: var(--bk-brand);
    color: white;
    border-radius: 10px;
    font-weight: 600;
    letter-spacing: 0.04em;
}

/* =========================================================
   MAIN CONTENT AREA
   ========================================================= */
.bk-main {
    margin-left: var(--bk-sidebar-w);
    margin-top: var(--bk-topbar-h);
    padding: 32px;
    min-height: calc(100vh - var(--bk-topbar-h));
}
.bk-main-inner { max-width: 1200px; margin: 0 auto; }

/* Footer inside main */
.bk-app-footer {
    margin-top: 48px;
    padding-top: 20px;
    border-top: var(--bk-border);
    font-size: 11px;
    color: var(--bk-gray-400);
    text-align: center;
}
.bk-app-footer a { color: var(--bk-gray-500); }
.bk-app-footer a:hover { color: var(--bk-brand); }

/* =========================================================
   LOADING OVERLAY (UpdatePanel progress)
   ========================================================= */
.bk-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: rgba(255, 255, 255, 0.7);
    z-index: 9999;
    backdrop-filter: blur(2px);
}
.bk-overlay-spinner {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 40px; height: 40px;
    border: 3px solid var(--bk-gray-200);
    border-top-color: var(--bk-brand);
    border-radius: 50%;
    animation: bk-spin 0.8s linear infinite;
}
@keyframes bk-spin { to { transform: translate(-50%, -50%) rotate(360deg); } }

/* =========================================================
   RESPONSIVE (master page chrome)
   ========================================================= */
@media (max-width: 1024px) {
    .bk-sidebar { transform: translateX(-100%); box-shadow: 0 10px 30px rgba(0,0,0,0.12); }
    .bk-sidebar.open { transform: translateX(0); }
    .bk-sidebar-backdrop.open { display: block; }
    .bk-main { margin-left: 0; padding: 20px 16px; }
    .bk-brand { width: auto; padding-right: 0; }
    .bk-hamburger { display: grid; }
}
@media (max-width: 600px) {
    .bk-user-name { display: none; }
    .bk-balance-chip { padding: 6px 10px; }
}

/* =========================================================
   .bk-page SCOPE (used on individual pages for content styling)
   ========================================================= */
.bk-page,
.bk-page * { box-sizing: border-box; }
.bk-page h1, .bk-page h2, .bk-page h3, .bk-page h4 {
    margin: 0;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--bk-gray-900);
}
.bk-page h1 { font-size: 24px; letter-spacing: -0.02em; }
.bk-page h2 { font-size: 18px; }
.bk-page h3 { font-size: 15px; }
.bk-page h4 { font-size: 13px; }
.bk-page p  { margin: 0; }
.bk-page a  { color: var(--bk-brand); text-decoration: none; }
.bk-page a:hover { text-decoration: underline; }

/* Page header */
.bk-page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: var(--bk-s-5);
    flex-wrap: wrap;
    margin-bottom: var(--bk-s-6);
    padding-bottom: var(--bk-s-5);
    border-bottom: var(--bk-border);
}
.bk-page-header h1 { margin-bottom: var(--bk-s-1); }
.bk-page-header p {
    font-size: 13px;
    color: var(--bk-gray-500);
    max-width: 560px;
}
.bk-page-header-actions {
    display: flex;
    gap: var(--bk-s-2);
    align-items: center;
}

/* =========================================================
   CARDS
   ========================================================= */
.bk-card {
    background: var(--bk-gray-0);
    border: var(--bk-border);
    border-radius: var(--bk-r-lg);
    padding: var(--bk-s-6);
    margin-bottom: var(--bk-s-4);
}
.bk-card-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--bk-s-4);
    margin-bottom: var(--bk-s-5);
    flex-wrap: wrap;
}
.bk-card-head h2 { margin: 0 0 var(--bk-s-1); }
.bk-card-sub {
    font-size: 12px;
    color: var(--bk-gray-500);
    line-height: 1.5;
}

/* =========================================================
   BUTTONS
   ========================================================= */
.bk-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--bk-s-2);
    padding: 8px 14px;
    font-family: inherit;
    font-size: 13px;
    font-weight: 500;
    line-height: 1;
    border: 1px solid transparent;
    border-radius: var(--bk-r);
    cursor: pointer;
    text-decoration: none;
    transition: background var(--bk-t-fast), color var(--bk-t-fast), border-color var(--bk-t-fast), box-shadow var(--bk-t-fast);
    white-space: nowrap;
    -webkit-appearance: none;
    appearance: none;
}
.bk-btn:focus-visible { outline: none; box-shadow: var(--bk-ring); }
.bk-btn:disabled { opacity: 0.55; cursor: not-allowed; }
.bk-btn svg { width: 14px; height: 14px; flex-shrink: 0; }

.bk-btn-primary {
    background: var(--bk-brand);
    color: white;
    border-color: var(--bk-brand);
}
.bk-btn-primary:hover { background: var(--bk-brand-hover); border-color: var(--bk-brand-hover); color: white; }
.bk-btn-primary:active { background: var(--bk-brand-active); border-color: var(--bk-brand-active); }

.bk-btn-ghost {
    background: var(--bk-gray-0);
    color: var(--bk-gray-700);
    border-color: var(--bk-gray-200);
}
.bk-btn-ghost:hover { background: var(--bk-gray-50); border-color: var(--bk-gray-300); color: var(--bk-gray-900); }
.bk-btn-ghost:active { background: var(--bk-gray-100); }

.bk-btn-danger {
    background: var(--bk-gray-0);
    color: var(--bk-danger);
    border-color: var(--bk-gray-200);
}
.bk-btn-danger:hover { background: var(--bk-danger-bg); border-color: #fca5a5; }

.bk-btn-sm { padding: 5px 10px; font-size: 11px; }
.bk-btn-lg { padding: 10px 20px; font-size: 14px; }

/* =========================================================
   FORM ELEMENTS
   ========================================================= */
.bk-field {
    display: flex;
    flex-direction: column;
    gap: var(--bk-s-1);
    margin-bottom: var(--bk-s-4);
}
.bk-field-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--bk-s-4) var(--bk-s-5);
    margin-bottom: var(--bk-s-4);
}
.bk-label {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 12px;
    font-weight: 500;
    color: var(--bk-gray-700);
    margin-bottom: 2px;
}
.bk-label-req::after {
    content: '*';
    color: var(--bk-brand);
    font-weight: 500;
    margin-left: 2px;
}
.bk-label-hint {
    font-size: 11px;
    color: var(--bk-gray-500);
    font-weight: 400;
    margin-left: auto;
}

.bk-input,
.bk-page input[type="text"],
.bk-page input[type="email"],
.bk-page input[type="tel"],
.bk-page input[type="number"],
.bk-page input[type="password"],
.bk-page input[type="search"],
.bk-page input[type="date"],
.bk-page input[type="time"],
.bk-page input[type="datetime-local"],
.bk-page textarea,
.bk-page select {
    width: 100%;
    padding: 8px 12px;
    font-family: inherit;
    font-size: 13px;
    line-height: 1.5;
    color: var(--bk-gray-900);
    background: var(--bk-gray-0);
    border: 1px solid var(--bk-gray-200);
    border-radius: var(--bk-r);
    transition: border-color var(--bk-t-fast), box-shadow var(--bk-t-fast);
    -webkit-appearance: none;
    appearance: none;
}
.bk-page input:hover,
.bk-page textarea:hover,
.bk-page select:hover { border-color: var(--bk-gray-300); }

.bk-page input:focus,
.bk-page textarea:focus,
.bk-page select:focus {
    outline: none;
    border-color: var(--bk-brand);
    box-shadow: var(--bk-ring);
}
.bk-page input:disabled,
.bk-page textarea:disabled,
.bk-page select:disabled {
    background: var(--bk-gray-50);
    color: var(--bk-gray-500);
    cursor: not-allowed;
}
.bk-page input::placeholder,
.bk-page textarea::placeholder { color: var(--bk-gray-400); }

.bk-page textarea {
    resize: vertical;
    min-height: 96px;
    line-height: 1.6;
}

.bk-page select {
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23737373' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 14px;
    padding-right: 32px;
}

.bk-field-error .bk-input,
.bk-field-error input,
.bk-field-error textarea,
.bk-field-error select { border-color: var(--bk-danger); }
.bk-error {
    font-size: 11px;
    color: var(--bk-danger);
    margin-top: 2px;
}
.bk-hint {
    font-size: 11px;
    color: var(--bk-gray-500);
    margin-top: 2px;
}

.bk-input-group { position: relative; display: flex; align-items: stretch; }
.bk-input-suffix {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--bk-font-mono);
    font-size: 11px;
    color: var(--bk-gray-500);
    pointer-events: none;
    background: var(--bk-gray-0);
    padding: 0 4px;
}

.bk-textarea-wrap { position: relative; }
.bk-textarea-counter {
    position: absolute;
    bottom: 8px;
    right: 10px;
    font-family: var(--bk-font-mono);
    font-size: 11px;
    color: var(--bk-gray-500);
    background: var(--bk-gray-0);
    padding: 1px 6px;
    border-radius: 3px;
    pointer-events: none;
}

.bk-textarea-rtl { direction: rtl; text-align: right; }

/* =========================================================
   FLATPICKR OVERRIDE
   ========================================================= */
.flatpickr-calendar {
    font-family: var(--bk-font-sans) !important;
    border-radius: var(--bk-r-md) !important;
    border: var(--bk-border) !important;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08) !important;
}
.flatpickr-day.selected,
.flatpickr-day.selected:hover {
    background: var(--bk-brand) !important;
    border-color: var(--bk-brand) !important;
    color: white !important;
}
.flatpickr-day.today { border-color: var(--bk-brand) !important; }
.flatpickr-day:hover {
    background: var(--bk-brand-tint) !important;
    color: var(--bk-brand) !important;
}

/* =========================================================
   BADGES / PILLS
   ========================================================= */
.bk-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    font-weight: 500;
    padding: 2px 8px;
    border-radius: var(--bk-r-pill);
    line-height: 1.5;
}
.bk-badge .dot { width: 5px; height: 5px; border-radius: 50%; display: inline-block; }
.bk-badge-success { background: var(--bk-success-bg); color: var(--bk-success-text); }
.bk-badge-success .dot { background: var(--bk-success); }
.bk-badge-warning { background: var(--bk-warning-bg); color: var(--bk-warning-text); }
.bk-badge-warning .dot { background: var(--bk-warning); }
.bk-badge-danger  { background: var(--bk-danger-bg); color: var(--bk-danger-text); }
.bk-badge-danger .dot { background: var(--bk-danger); }
.bk-badge-info    { background: var(--bk-info-bg); color: var(--bk-info-text); }
.bk-badge-info .dot { background: var(--bk-info); }
.bk-badge-neutral { background: var(--bk-gray-100); color: var(--bk-gray-600); }

/* =========================================================
   TABLES
   ========================================================= */
.bk-table-wrap {
    border: var(--bk-border);
    border-radius: var(--bk-r-md);
    overflow: hidden;
    background: var(--bk-gray-0);
}
.bk-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.bk-table thead th {
    text-align: left;
    padding: 10px 14px;
    font-weight: 500;
    color: var(--bk-gray-500);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    background: var(--bk-gray-50);
    border-bottom: var(--bk-border);
}
.bk-table tbody td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--bk-gray-100);
    vertical-align: middle;
}
.bk-table tbody tr:last-child td { border-bottom: none; }
.bk-table tbody tr { transition: background var(--bk-t-fast); }
.bk-table tbody tr:hover { background: var(--bk-gray-50); }

.bk-mono { font-family: var(--bk-font-mono); font-size: 12px; color: var(--bk-gray-600); }

/* =========================================================
   MODAL
   ========================================================= */
.bk-modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(10, 10, 10, 0.4);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--bk-s-4);
    animation: bkFadeIn var(--bk-t) ease-out;
}
.bk-modal-backdrop.open { display: flex; }
.bk-modal {
    background: var(--bk-gray-0);
    border-radius: var(--bk-r-lg);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.15);
    width: 100%;
    max-width: 480px;
    max-height: calc(100vh - var(--bk-s-8));
    display: flex;
    flex-direction: column;
    animation: bkZoomIn var(--bk-t) ease-out;
}
.bk-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--bk-s-4) var(--bk-s-5);
    border-bottom: var(--bk-border);
}
.bk-modal-header h2 { font-size: 15px; }
.bk-modal-close {
    width: 28px; height: 28px;
    display: grid; place-items: center;
    border: none;
    background: transparent;
    border-radius: var(--bk-r);
    cursor: pointer;
    color: var(--bk-gray-500);
    transition: background var(--bk-t-fast), color var(--bk-t-fast);
}
.bk-modal-close:hover { background: var(--bk-gray-100); color: var(--bk-gray-900); }
.bk-modal-close svg { width: 16px; height: 16px; }
.bk-modal-body { padding: var(--bk-s-5); overflow-y: auto; flex: 1; }
.bk-modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--bk-s-2);
    padding: var(--bk-s-3) var(--bk-s-5);
    border-top: var(--bk-border);
    background: var(--bk-gray-50);
}

@keyframes bkFadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes bkZoomIn { from { opacity: 0; transform: scale(0.95); } to { opacity: 1; transform: scale(1); } }

/* =========================================================
   TOAST
   ========================================================= */
.bk-toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--bk-s-2);
    pointer-events: none;
}
.bk-toast {
    pointer-events: auto;
    min-width: 280px;
    max-width: 400px;
    padding: 12px 16px;
    background: var(--bk-gray-900);
    color: var(--bk-gray-50);
    border-radius: var(--bk-r);
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: var(--bk-s-2);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    animation: bkSlideIn var(--bk-t) ease-out;
}
.bk-toast.success { background: var(--bk-success); }
.bk-toast.warning { background: var(--bk-warning); }
.bk-toast.danger  { background: var(--bk-danger); }
.bk-toast.leaving { animation: bkSlideOut var(--bk-t) ease-in forwards; }
@keyframes bkSlideIn  { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }
@keyframes bkSlideOut { to   { opacity: 0; transform: translateX(20px); } }

/* =========================================================
   STATS / METRICS
   ========================================================= */
.bk-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--bk-s-3);
    margin-top: var(--bk-s-5);
}
.bk-stat {
    background: var(--bk-gray-50);
    border: var(--bk-border);
    border-radius: var(--bk-r);
    padding: 14px 18px;
}
.bk-stat-label {
    font-size: 10px;
    color: var(--bk-gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 6px;
    font-weight: 500;
}
.bk-stat-value {
    font-size: 22px;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--bk-gray-900);
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
}
.bk-stat-sub { font-size: 11px; color: var(--bk-gray-500); margin-top: 4px; }

/* =========================================================
   ALERTS
   ========================================================= */
.bk-alert {
    display: flex;
    gap: var(--bk-s-3);
    padding: 14px 18px;
    border: 1px solid transparent;
    border-radius: var(--bk-r-md);
    margin-bottom: var(--bk-s-4);
    align-items: flex-start;
}
.bk-alert-icon { width: 20px; height: 20px; flex-shrink: 0; margin-top: 1px; }
.bk-alert-body { flex: 1; min-width: 0; }
.bk-alert-title { font-size: 13px; font-weight: 600; margin: 0 0 2px; }
.bk-alert-sub   { font-size: 12px; margin: 0; line-height: 1.5; }

.bk-alert-info    { background: var(--bk-info-bg);    border-color: #bfdbfe; color: var(--bk-info-text); }
.bk-alert-success { background: var(--bk-success-bg); border-color: #a7f3d0; color: var(--bk-success-text); }
.bk-alert-warning { background: var(--bk-warning-bg); border-color: #fde68a; color: var(--bk-warning-text); }
.bk-alert-danger  { background: var(--bk-danger-bg);  border-color: #fca5a5; color: var(--bk-danger-text); }

/* =========================================================
   EMPTY STATES
   ========================================================= */
.bk-empty {
    text-align: center;
    padding: 48px 24px;
    color: var(--bk-gray-500);
    font-size: 13px;
}
.bk-empty-icon {
    width: 44px; height: 44px;
    margin: 0 auto 12px;
    color: var(--bk-gray-300);
}
.bk-empty h3 {
    font-size: 14px;
    font-weight: 500;
    color: var(--bk-gray-900);
    margin: 0 0 4px;
}

/* =========================================================
   UTILITIES
   ========================================================= */
.bk-flex  { display: flex; }
.bk-inline-flex { display: inline-flex; }
.bk-grid  { display: grid; }
.bk-items-center { align-items: center; }
.bk-justify-between { justify-content: space-between; }
.bk-justify-end { justify-content: flex-end; }
.bk-gap-1 { gap: var(--bk-s-1); }
.bk-gap-2 { gap: var(--bk-s-2); }
.bk-gap-3 { gap: var(--bk-s-3); }
.bk-gap-4 { gap: var(--bk-s-4); }
.bk-mt-1 { margin-top: var(--bk-s-1); } .bk-mt-2 { margin-top: var(--bk-s-2); }
.bk-mt-3 { margin-top: var(--bk-s-3); } .bk-mt-4 { margin-top: var(--bk-s-4); }
.bk-mb-1 { margin-bottom: var(--bk-s-1); } .bk-mb-2 { margin-bottom: var(--bk-s-2); }
.bk-mb-3 { margin-bottom: var(--bk-s-3); } .bk-mb-4 { margin-bottom: var(--bk-s-4); }
.bk-text-center { text-align: center; }
.bk-text-right  { text-align: right; }
.bk-text-muted  { color: var(--bk-gray-500); }
.bk-text-sm     { font-size: 12px; }
.bk-text-xs     { font-size: 11px; }
.bk-full        { width: 100%; }
.bk-hidden      { display: none !important; }

.bk-divider {
    height: 1px;
    background: var(--bk-gray-200);
    border: none;
    margin: var(--bk-s-5) 0;
}

.bk-fade-in { animation: bkFadeIn var(--bk-t) ease-out; }

/* =========================================================
   RESPONSIVE (content pages)
   ========================================================= */
@media (max-width: 640px) {
    .bk-page-header { align-items: flex-start; }
    .bk-card { padding: var(--bk-s-4); }
    .bk-modal { max-width: 100%; }
    .bk-stats { grid-template-columns: 1fr; }
}