/*
 * VNHOT 2.0 — Design System
 * Phong cách: Medical Premium · Hiện đại 2026 · Tinh tế
 */

/* ============================================================
 * 1. Design Tokens (CSS Variables)
 * ============================================================ */

:root {
  /* Brand — Medical teal */
  --color-primary-50:  #F0FDFA;
  --color-primary-100: #CCFBF1;
  --color-primary-200: #99F6E4;
  --color-primary-300: #5EEAD4;
  --color-primary-400: #2DD4BF;
  --color-primary-500: #14B8A6;
  --color-primary-600: #0D9488;
  --color-primary-700: #0F766E;
  --color-primary-800: #115E59;
  --color-primary-900: #134E4A;

  /* Neutral — Slate */
  --color-neutral-0:   #FFFFFF;
  --color-neutral-50:  #F8FAFC;
  --color-neutral-100: #F1F5F9;
  --color-neutral-200: #E2E8F0;
  --color-neutral-300: #CBD5E1;
  --color-neutral-400: #94A3B8;
  --color-neutral-500: #64748B;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1E293B;
  --color-neutral-900: #0F172A;

  /* Status — Y tế */
  --color-success-50:  #ECFDF5;
  --color-success-500: #10B981;
  --color-success-700: #047857;
  --color-warning-50:  #FFFBEB;
  --color-warning-500: #F59E0B;
  --color-warning-700: #B45309;
  --color-danger-50:   #FEF2F2;
  --color-danger-500:  #EF4444;
  --color-danger-700:  #B91C1C;
  --color-info-50:     #EFF6FF;
  --color-info-500:    #3B82F6;
  --color-info-700:    #1D4ED8;

  /* Nghiệp vụ — màu cảnh báo y tế */
  --color-capcuu:   #DC2626;  /* đỏ */
  --color-treem:    #F97316;  /* cam */
  --color-dahien:   #10B981;  /* xanh emerald */
  --color-cothe:    #8B5CF6;  /* tím */
  --color-timeout:  #EAB308;  /* vàng */
  --color-chetnao:  #3B82F6;  /* xanh dương */

  /* Semantic */
  --bg-page:       var(--color-neutral-50);
  --bg-surface:    var(--color-neutral-0);
  --bg-elevated:   var(--color-neutral-0);
  --bg-hover:      var(--color-neutral-100);
  --bg-muted:      var(--color-neutral-100);

  --text-primary:   var(--color-neutral-900);
  --text-secondary: var(--color-neutral-600);
  --text-tertiary:  var(--color-neutral-500);
  --text-muted:     var(--color-neutral-400);
  --text-inverse:   var(--color-neutral-0);

  --border-subtle:  var(--color-neutral-200);
  --border-default: var(--color-neutral-300);
  --border-strong:  var(--color-neutral-400);

  /* Layout */
  --sidebar-width: 260px;
  --sidebar-width-collapsed: 72px;
  --topbar-height: 60px;
  --container-max: 1440px;

  /* Spacing scale (8px grid) */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-pill: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.07), 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 24px rgba(15, 23, 42, 0.08), 0 4px 8px rgba(15, 23, 42, 0.05);
  --shadow-xl: 0 24px 48px rgba(15, 23, 42, 0.12), 0 8px 16px rgba(15, 23, 42, 0.06);
  --shadow-focus: 0 0 0 3px rgba(20, 184, 166, 0.2);

  /* Typography */
  --font-sans: 'Inter', 'IBM Plex Sans', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'SF Mono', Consolas, monospace;
  --font-size-xs: 0.75rem;     /* 12 */
  --font-size-sm: 0.8125rem;   /* 13 */
  --font-size-base: 0.875rem;  /* 14 */
  --font-size-md: 0.9375rem;   /* 15 */
  --font-size-lg: 1.0625rem;   /* 17 */
  --font-size-xl: 1.25rem;     /* 20 */
  --font-size-2xl: 1.5rem;     /* 24 */
  --font-size-3xl: 1.875rem;   /* 30 */
  --line-tight: 1.25;
  --line-base: 1.5;
  --line-relaxed: 1.7;

  /* Transitions */
  --transition-fast: 120ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-page:     #0B1220;
  --bg-surface:  #131C2E;
  --bg-elevated: #1A2438;
  --bg-hover:    #1F2A40;
  --bg-muted:    #1A2438;

  --text-primary:   #F1F5F9;
  --text-secondary: #94A3B8;
  --text-tertiary:  #64748B;
  --text-muted:     #475569;

  --border-subtle:  #1F2A40;
  --border-default: #2A3654;
  --border-strong:  #475569;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 24px rgba(0, 0, 0, 0.5);
}

/* ============================================================
 * 2. Reset & Base
 * ============================================================ */

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  font-feature-settings: "cv11", "ss01", "ss03";
  font-variant-numeric: tabular-nums;
  line-height: var(--line-base);
  color: var(--text-primary);
  background: var(--bg-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  margin: 0;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  line-height: var(--line-tight);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5, h6 { font-size: var(--font-size-md); }

code, .vnhot-code, kbd {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--bg-muted);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--color-primary-700);
}

a {
  color: var(--color-primary-700);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover { color: var(--color-primary-800); }

::selection {
  background: var(--color-primary-200);
  color: var(--color-primary-900);
}

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border-default);
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover { background: var(--border-strong); background-clip: content-box; }

/* ============================================================
 * 3. Layout — Sidebar + Topbar + Main
 * ============================================================ */

.vnhot-app {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  min-height: 100vh;
  transition: grid-template-columns var(--transition-base);
}
.vnhot-app.sidebar-collapsed { grid-template-columns: var(--sidebar-width-collapsed) 1fr; }

.vnhot-sidebar {
  background: linear-gradient(180deg, #134E4A 0%, #0F172A 100%);
  color: #E2E8F0;
  padding: var(--space-4) 0;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid rgba(255, 255, 255, 0.05);
}

.vnhot-sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-5);
  margin-bottom: var(--space-6);
  font-weight: 700;
  font-size: var(--font-size-lg);
  letter-spacing: -0.02em;
  color: white;
}
.vnhot-sidebar-brand-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-primary-600));
  border-radius: var(--radius-md);
  color: white;
  font-size: 1.2rem;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(20, 184, 166, 0.3);
}
.vnhot-sidebar-brand-text { transition: opacity var(--transition-base); white-space: nowrap; }
.sidebar-collapsed .vnhot-sidebar-brand-text { opacity: 0; pointer-events: none; }

.vnhot-sidebar-section {
  padding: var(--space-2) var(--space-5);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-neutral-400);
  margin-top: var(--space-4);
  white-space: nowrap;
  transition: opacity var(--transition-base);
}
.sidebar-collapsed .vnhot-sidebar-section { opacity: 0; }

.vnhot-sidebar-nav {
  list-style: none;
  padding: 0;
  margin: 0;
}
.vnhot-sidebar-nav a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  color: var(--color-neutral-300);
  font-size: var(--font-size-md);
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
  overflow: hidden;
}
.vnhot-sidebar-nav a:hover {
  background: rgba(255, 255, 255, 0.05);
  color: white;
}
.vnhot-sidebar-nav a.active {
  background: linear-gradient(90deg, rgba(20, 184, 166, 0.15), transparent);
  color: white;
  border-left-color: var(--color-primary-400);
}
.vnhot-sidebar-nav a i {
  font-size: 1.15rem;
  width: 24px;
  text-align: center;
  flex-shrink: 0;
}
.vnhot-sidebar-nav-text { transition: opacity var(--transition-base); }
.sidebar-collapsed .vnhot-sidebar-nav-text { opacity: 0; }

/* Topbar */
.vnhot-topbar {
  height: var(--topbar-height);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-5);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}
.vnhot-topbar-left { display: flex; align-items: center; gap: var(--space-4); }
.vnhot-topbar-right { display: flex; align-items: center; gap: var(--space-3); }

.vnhot-icon-btn {
  background: none;
  border: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.vnhot-icon-btn:hover { background: var(--bg-muted); color: var(--text-primary); }

.vnhot-user-pill {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 12px 6px 6px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--text-primary);
  font-size: var(--font-size-base);
}
.vnhot-user-pill:hover { background: var(--bg-muted); }
.vnhot-avatar {
  width: 28px; height: 28px;
  border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--color-primary-400), var(--color-primary-700));
  color: white;
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 600;
  font-size: 0.75rem;
}

/* Main content */
.vnhot-main {
  padding: var(--space-5) var(--space-6);
  max-width: var(--container-max);
  margin: 0 auto;
  width: 100%;
}

/* ============================================================
 * 4. Page header
 * ============================================================ */

.vnhot-page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}
.vnhot-page-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}
.vnhot-page-subtitle {
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  margin-top: var(--space-1);
}
.vnhot-page-actions { display: flex; gap: var(--space-2); flex-wrap: wrap; }

/* ============================================================
 * 5. Cards & Surfaces
 * ============================================================ */

.vnhot-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition-base);
}
.vnhot-card:hover { box-shadow: var(--shadow-sm); }
.vnhot-card-header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.vnhot-card-title {
  font-size: var(--font-size-md);
  font-weight: 600;
  margin: 0;
  color: var(--text-primary);
}
.vnhot-card-body { padding: var(--space-5); }
.vnhot-card-footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-muted);
  display: flex; align-items: center; justify-content: flex-end; gap: var(--space-2);
}

/* KPI card */
.vnhot-kpi {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-base);
}
.vnhot-kpi:hover {
  border-color: var(--color-primary-300);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}
.vnhot-kpi-label {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  font-weight: 600;
}
.vnhot-kpi-value {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--text-primary);
  margin: var(--space-2) 0;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
}
.vnhot-kpi-trend {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
}
.vnhot-kpi-trend.up { color: var(--color-success-700); background: var(--color-success-50); }
.vnhot-kpi-trend.down { color: var(--color-danger-700); background: var(--color-danger-50); }
.vnhot-kpi-icon {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.25rem;
  background: var(--color-primary-50);
  color: var(--color-primary-700);
}

/* ============================================================
 * 6. Buttons
 * ============================================================ */

.vnhot-btn, .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: inherit;
  font-size: var(--font-size-base);
  font-weight: 500;
  line-height: 1;
  padding: 9px 16px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}
.vnhot-btn:focus-visible, .btn:focus-visible { outline: none; box-shadow: var(--shadow-focus); }

.btn-primary {
  background: var(--color-primary-700);
  color: white !important;
  border-color: var(--color-primary-700);
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-800);
  border-color: var(--color-primary-800);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(15, 118, 110, 0.25);
}
.btn-success { background: var(--color-success-700); border-color: var(--color-success-700); color: white !important; }
.btn-success:hover:not(:disabled) { background: var(--color-success-700); filter: brightness(1.05); }
.btn-warning { background: var(--color-warning-500); border-color: var(--color-warning-500); color: white !important; }
.btn-danger { background: var(--color-danger-500); border-color: var(--color-danger-500); color: white !important; }
.btn-danger:hover:not(:disabled) { background: var(--color-danger-700); }

.btn-outline-primary {
  border-color: var(--border-default);
  color: var(--text-primary) !important;
  background: var(--bg-surface);
}
.btn-outline-primary:hover:not(:disabled) {
  border-color: var(--color-primary-600);
  color: var(--color-primary-700) !important;
  background: var(--color-primary-50);
}
.btn-outline-secondary {
  border-color: var(--border-default);
  color: var(--text-secondary) !important;
  background: var(--bg-surface);
}
.btn-outline-secondary:hover:not(:disabled) { background: var(--bg-muted); color: var(--text-primary) !important; }
.btn-outline-danger { border-color: var(--border-default); color: var(--color-danger-700) !important; background: var(--bg-surface); }
.btn-outline-danger:hover:not(:disabled) { background: var(--color-danger-50); border-color: var(--color-danger-500); }

.btn-sm { font-size: var(--font-size-sm); padding: 6px 12px; }

/* ============================================================
 * 7. Forms
 * ============================================================ */

.form-label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.form-label.small, label.small { font-size: var(--font-size-xs); font-weight: 500; color: var(--text-tertiary); text-transform: uppercase; letter-spacing: 0.04em; }

.form-control, .form-select {
  font-family: inherit;
  font-size: var(--font-size-base);
  padding: 9px 12px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  color: var(--text-primary);
  transition: all var(--transition-fast);
}
.form-control:focus, .form-select:focus {
  outline: none;
  border-color: var(--color-primary-500);
  box-shadow: var(--shadow-focus);
}
.form-control::placeholder { color: var(--text-muted); }
.form-control:disabled { background: var(--bg-muted); color: var(--text-muted); }

.form-check-input:checked { background-color: var(--color-primary-600); border-color: var(--color-primary-600); }
.form-check-input:focus { box-shadow: var(--shadow-focus); border-color: var(--color-primary-500); }

/* ============================================================
 * 8. Tables
 * ============================================================ */

.table {
  margin: 0;
  color: var(--text-primary);
  font-size: var(--font-size-base);
  border-color: var(--border-subtle);
}
.table > thead > tr > th {
  background: var(--bg-muted);
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-tertiary);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-3) var(--space-4);
  white-space: nowrap;
}
.table > tbody > tr > td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: middle;
}
.table > tbody > tr:hover { background: var(--bg-muted); }
.table > tbody > tr:last-child > td { border-bottom: none; }

/* ============================================================
 * 9. Badges (status pills)
 * ============================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--font-size-xs);
  font-weight: 500;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.01em;
  line-height: 1.4;
}
.badge-soft-success { background: var(--color-success-50); color: var(--color-success-700); }
.badge-soft-warning { background: var(--color-warning-50); color: var(--color-warning-700); }
.badge-soft-danger  { background: var(--color-danger-50); color: var(--color-danger-700); }
.badge-soft-info    { background: var(--color-info-50); color: var(--color-info-700); }
.badge-soft-primary { background: var(--color-primary-50); color: var(--color-primary-700); }

.badge-capcuu  { background: #FEE2E2; color: var(--color-capcuu); }
.badge-treem   { background: #FFEDD5; color: var(--color-treem); }
.badge-dahien  { background: #D1FAE5; color: #047857; }
.badge-cothe   { background: #EDE9FE; color: #6D28D9; }
.badge-chetnao { background: #DBEAFE; color: #1D4ED8; }

/* Pulse animation cho countdown sắp hết */
.badge-pulse { animation: pulse 1.5s ease-in-out infinite; }
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* ============================================================
 * 10. Alerts
 * ============================================================ */

.alert {
  border-radius: var(--radius-md);
  border: 1px solid;
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  margin-bottom: var(--space-4);
}
.alert-info { background: var(--color-info-50); border-color: #BFDBFE; color: var(--color-info-700); }
.alert-success { background: var(--color-success-50); border-color: #A7F3D0; color: var(--color-success-700); }
.alert-warning { background: var(--color-warning-50); border-color: #FCD34D; color: var(--color-warning-700); }
.alert-danger { background: var(--color-danger-50); border-color: #FECACA; color: var(--color-danger-700); }

/* ============================================================
 * 11. Ranked list (cho điều phối)
 * ============================================================ */

.vnhot-ranked-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-fast);
}
.vnhot-ranked-item:hover { background: var(--bg-muted); }
.vnhot-ranked-item.is-current {
  background: linear-gradient(90deg, var(--color-warning-50), transparent);
  border-left: 3px solid var(--color-warning-500);
}
.vnhot-ranked-position {
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-muted);
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-lg);
  color: var(--text-tertiary);
  flex-shrink: 0;
}
.vnhot-ranked-position.position-1 { background: linear-gradient(135deg, #FCD34D, #F59E0B); color: white; }
.vnhot-ranked-position.position-2 { background: linear-gradient(135deg, #E5E7EB, #9CA3AF); color: white; }
.vnhot-ranked-position.position-3 { background: linear-gradient(135deg, #FDBA74, #C2410C); color: white; }
.vnhot-ranked-info { flex: 1; min-width: 0; }
.vnhot-ranked-name { font-weight: 600; font-size: var(--font-size-md); color: var(--text-primary); }
.vnhot-ranked-meta { font-size: var(--font-size-sm); color: var(--text-tertiary); margin-top: 2px; display: flex; gap: var(--space-2); flex-wrap: wrap; align-items: center; }
.vnhot-ranked-score {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary-700);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.vnhot-ranked-actions { display: flex; gap: var(--space-2); }

/* ============================================================
 * 12. Countdown
 * ============================================================ */

.vnhot-countdown {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: var(--font-size-md);
  padding: 6px 12px;
  border-radius: var(--radius-md);
  background: var(--color-warning-50);
  color: var(--color-warning-700);
}
.vnhot-countdown.is-danger { background: var(--color-danger-50); color: var(--color-danger-700); animation: pulse 1.5s ease-in-out infinite; }
.vnhot-countdown.is-expired { background: var(--color-neutral-200); color: var(--text-tertiary); animation: none; }

/* ============================================================
 * 13. Tabs
 * ============================================================ */

.nav-tabs {
  border-bottom: 1px solid var(--border-subtle);
  gap: var(--space-1);
}
.nav-tabs .nav-link {
  border: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: var(--font-size-base);
  padding: var(--space-3) var(--space-4);
  border-radius: 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}
.nav-tabs .nav-link:hover { color: var(--text-primary); border-bottom-color: var(--border-default); }
.nav-tabs .nav-link.active {
  background: transparent;
  color: var(--color-primary-700);
  border-bottom-color: var(--color-primary-600);
  font-weight: 600;
}

/* ============================================================
 * 14. Empty state
 * ============================================================ */

.vnhot-empty {
  text-align: center;
  padding: var(--space-7) var(--space-4);
  color: var(--text-tertiary);
}
.vnhot-empty-icon {
  font-size: 3rem;
  color: var(--border-default);
  margin-bottom: var(--space-3);
}
.vnhot-empty-title { font-size: var(--font-size-md); font-weight: 600; color: var(--text-secondary); margin-bottom: var(--space-1); }
.vnhot-empty-desc { font-size: var(--font-size-sm); }

/* ============================================================
 * 15. Login screen
 * ============================================================ */

.vnhot-login-page {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg-page);
}
@media (max-width: 991px) {
  .vnhot-login-page { grid-template-columns: 1fr; }
  .vnhot-login-hero { display: none; }
}
.vnhot-login-hero {
  background:
    linear-gradient(135deg, rgba(15, 118, 110, 0.95), rgba(15, 23, 42, 0.95)),
    url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100"><circle cx="50" cy="50" r="2" fill="white" opacity="0.05"/></svg>');
  background-size: cover;
  color: white;
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}
.vnhot-login-hero::before {
  content: '';
  position: absolute;
  top: -50%; right: -50%;
  width: 100%; height: 100%;
  background: radial-gradient(circle, rgba(20, 184, 166, 0.2), transparent 70%);
}
.vnhot-login-form-wrap {
  display: flex; align-items: center; justify-content: center;
  padding: var(--space-6);
}
.vnhot-login-card {
  width: 100%; max-width: 420px;
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-7) var(--space-6);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border-subtle);
}

/* ============================================================
 * 16. Utility
 * ============================================================ */

.vnhot-divider { height: 1px; background: var(--border-subtle); border: none; margin: var(--space-4) 0; }
.text-tabular { font-variant-numeric: tabular-nums; }
.text-muted-soft { color: var(--text-muted); }
.shadow-soft { box-shadow: var(--shadow-sm); }
.shadow-medium { box-shadow: var(--shadow-md); }
.shadow-strong { box-shadow: var(--shadow-lg); }

/* Toast container */
.vnhot-toast-container {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

/* Responsive sidebar */
@media (max-width: 991px) {
  .vnhot-app { grid-template-columns: 1fr; }
  .vnhot-sidebar {
    position: fixed;
    z-index: 200;
    left: 0;
    transform: translateX(-100%);
    transition: transform var(--transition-base);
    width: var(--sidebar-width);
  }
  .vnhot-sidebar.show { transform: translateX(0); }
  .vnhot-sidebar-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 199;
    backdrop-filter: blur(4px);
  }
}

/* Print */
@media print {
  .vnhot-sidebar, .vnhot-topbar, .vnhot-page-actions { display: none !important; }
  .vnhot-main { padding: 0; max-width: none; }
  .vnhot-card { box-shadow: none; border: 1px solid #ccc; }
}