/* ══════════════════════════════════════════════
   Nhật Tuyền — Custom styles  (Green theme)
   ══════════════════════════════════════════════ */

/* ── Design tokens ── */
:root {
  /* ── Green palette ── */
  --nt-primary:        #16a34a;   /* green-600 */
  --nt-primary-dark:   #15803d;   /* green-700 */
  --nt-primary-deeper: #14532d;   /* green-900 */
  --nt-primary-50:     #f0fdf4;
  --nt-primary-100:    #dcfce7;
  --nt-primary-200:    #bbf7d0;

  /* ── Supporting ── */
  --nt-secondary: #f59e0b;        /* amber – accent cho TC / sao */
  --nt-accent:    #0891b2;        /* cyan – điểm nhấn thứ hai */
  --nt-success:   #16a34a;
  --nt-warning:   #f59e0b;
  --nt-danger:    #ef4444;
  --nt-dark-bg:   #1a3a2a;        /* navbar + footer dark-green */

  /* ── Surfaces ── */
  --nt-light:     #fffafa;
  --nt-white:     #ffffff;

  /* ── Typography ── */
  --nt-text:          #111a14;
  --nt-text-muted:    #4b6358;
  --nt-border:        #a7c4b0;
  --nt-border-light:  #d1e8d9;

  /* ── Radii ── */
  --nt-radius:    12px;
  --nt-radius-lg: 16px;
  --nt-radius-xl: 20px;

  /* ── Shadows ── */
  --nt-shadow-sm: 0 1px 3px rgba(22,163,74,.07), 0 1px 2px rgba(17,26,20,.04);
  --nt-shadow:    0 4px 16px rgba(22,163,74,.10), 0 1px 4px rgba(17,26,20,.05);
  --nt-shadow-lg: 0 12px 40px rgba(22,163,74,.15), 0 4px 12px rgba(17,26,20,.07);
}

/* ── Base ── */
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Helvetica Neue', system-ui, sans-serif;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--nt-text);
  background: var(--nt-light);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Inter', 'Helvetica Neue', system-ui, sans-serif;
  color: var(--nt-text);
  line-height: 1.3;
  font-weight: 700;
}

/* ── Bootstrap color overrides ── */
.text-primary   { color: var(--nt-primary) !important; }
.bg-primary     { background-color: var(--nt-primary) !important; }
.border-primary { border-color: var(--nt-primary) !important; }

.btn-primary {
  background-color: var(--nt-primary);
  border-color: var(--nt-primary);
  color: #fff;
  font-weight: 600;
  border-radius: 10px;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
  padding: 0.55rem 1.25rem;
}
.btn-primary:hover, .btn-primary:focus {
  background-color: var(--nt-primary-dark);
  border-color: var(--nt-primary-dark);
  color: #fff;
  box-shadow: 0 4px 14px rgba(22,163,74,.35);
}

.btn-outline-primary {
  color: var(--nt-primary);
  border-color: var(--nt-primary);
  font-weight: 600;
  border-radius: 10px;
  font-size: 0.9rem;
  padding: 0.55rem 1.25rem;
}
.btn-outline-primary:hover {
  background-color: var(--nt-primary);
  border-color: var(--nt-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(22,163,74,.30);
}

.btn-outline-secondary {
  border-color: var(--nt-border);
  color: var(--nt-text-muted);
  font-weight: 600;
  border-radius: 10px;
  font-size: 0.9rem;
}
.btn-outline-secondary:hover {
  background-color: var(--nt-primary-50);
  border-color: var(--nt-primary);
  color: var(--nt-primary);
}

/* btn-sm — ghi đè lại padding, không dùng height cứng */
.btn-sm {
  padding: 0.3rem 0.8rem !important;
  font-size: 0.82rem !important;
  border-radius: 8px !important;
  line-height: 1.5;
}

/* btn thường trong nội dung section */
.section-intro .btn,
#why-choose-us .btn {
  display: inline-flex;
  align-items: center;
}

/* ── Navbar ── */
.navbar-public {
  background: var(--nt-dark-bg) !important;
  box-shadow: 0 2px 16px rgba(17,26,20,.25);
}

/* Mobile menu overlays the page as a full-height panel instead of a small
   dropdown — easier to tap on a phone and matches the app's other full-screen
   mobile menus. --nt-navbar-h is set from JS to the navbar's real height. */
@media (max-width: 991.98px) {
  .navbar-public .navbar-collapse {
    position: fixed;
    top: var(--nt-navbar-h, 64px);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--nt-dark-bg);
    padding: 1rem;
    box-shadow: 0 8px 16px rgba(17,26,20,.25);
    z-index: 1040;
    overflow-y: auto;
    display: none;
    flex-direction: column;
  }
  /* .show = fully open; .collapsing = mid-toggle — both need to render as
     the flex panel, otherwise it either never appears or pops in with no
     animation. Without this, display:flex applied unconditionally would
     win over Bootstrap's .collapse:not(.show){display:none} (equal
     specificity, this file loads after bootstrap.css) and the panel would
     stay visible permanently, making the toggle button non-functional. */
  .navbar-public .navbar-collapse.show,
  .navbar-public .navbar-collapse.collapsing {
    display: flex;
  }
  /* Center the whole menu (items + branch info) as one compact group in the
     middle of the panel instead of stretching the item list to fill the
     full height — that used to leave a large dead gap before the info
     block sat pinned to the very bottom. Grouping + centering keeps
     everything within a single screen, no scrolling needed. */
  .navbar-public .navbar-collapse {
    justify-content: center;
  }
  .navbar-public .navbar-collapse .navbar-nav {
    flex: 0 0 auto;
    width: 100%;
    margin-left: 0 !important;
  }
  .navbar-public .navbar-collapse .nav-item {
    text-align: center;
  }
  .navbar-public .navbar-collapse .nav-link {
    font-size: 1.15rem;
    padding: 0.85rem 1rem;
  }
  .navbar-public .navbar-collapse .nav-link.btn {
    font-size: 1rem !important;
    display: inline-block;
    margin-top: 0.5rem;
  }
  .navbar-mobile-info {
    margin-top: 1.5rem;
    padding-top: 0.85rem;
    border-top: 1px solid rgba(255,255,255,.15);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
  }
  .navbar-mobile-info-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    color: rgba(255,255,255,.7);
    font-size: 0.82rem;
    line-height: 1.4;
  }
  .navbar-mobile-info-item a {
    color: inherit;
    text-decoration: none;
  }
  .navbar-mobile-info-item i {
    flex-shrink: 0;
  }
}
@media (min-width: 992px) {
  .navbar-mobile-info { display: none; }
}

.navbar .nav-link {
  font-weight: 500;
  font-size: 0.9rem;
  transition: all 0.2s ease;
  color: rgba(255,255,255,.85) !important;
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  line-height: 1.5;
}
.navbar .nav-link:hover {
  color: #fff !important;
  background: rgba(255,255,255,.12);
}

/* Nút Đăng nhập trong navbar */
.navbar .nav-link.btn.btn-sm.btn-outline-light {
  border: 1px solid rgba(255,255,255,.55);
  padding: 0.3rem 0.85rem !important;
  font-size: 0.82rem !important;
  border-radius: 8px !important;
  line-height: 1.5;
}
.navbar .nav-link.btn.btn-sm.btn-outline-light:hover {
  background: rgba(255,255,255,.15);
  border-color: #fff;
  color: #fff !important;
}

/* ── Hero ── */
.hero-section {
  background: linear-gradient(135deg, #15803d 0%, #0891b2 100%);
  position: relative;
  overflow: hidden;
}
.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 40%, rgba(255,255,255,.09) 0%, transparent 70%),
    radial-gradient(ellipse 60% 80% at 80% 60%, rgba(8,145,178,.18) 0%, transparent 70%);
  pointer-events: none;
}
.hero-section .container { position: relative; z-index: 1; }

/* Chữ trong hero luôn trắng, không bị override */
.hero-section,
.hero-section h1,
.hero-section p,
.hero-section .lead,
.hero-section .opacity-75 {
  color: #fff;
}

/* ══ Hero v2 (clean style, ref: giaolaucaulong) ══ */
.hero-section-v2 {
  position: relative;
  overflow: hidden;
  padding: 7rem 0 6rem;
  min-height: 82vh;
  display: flex;
  align-items: center;
  background: #fffafa; /* JS will override from data-bg */
}

/* Decorative background icons */
.hero-deco {
  position: absolute;
  font-size: 7rem;
  opacity: 0.055;
  color: var(--nt-primary);
  line-height: 1;
  pointer-events: none;
  user-select: none;
}
.hero-deco-1 { top: 8%;  left:  5%; }
.hero-deco-2 { top: 65%; left: 12%; font-size: 5rem; }
.hero-deco-3 { top: 10%; right: 7%; font-size: 5.5rem; }
.hero-deco-4 { bottom: 8%; right: 9%; font-size: 6rem; }

.hero-section-v2 .container { width: 100%; }
.hero-v2-inner {
  position: relative;
  z-index: 2;
}

/* Badge pill */
.hero-badge-pill {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .45rem 1.1rem;
  border-radius: 999px;
  border: 1.5px solid var(--nt-primary-200);
  background: var(--nt-primary-50);
  color: var(--nt-primary-dark);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

/* Headlines */
.hero-v2-h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--nt-text);
  letter-spacing: -.02em;
}
.hero-v2-gradient {
  background: linear-gradient(90deg, var(--nt-primary) 0%, var(--nt-accent) 60%, #f59e0b 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Subtitle */
.hero-v2-sub {
  font-size: 1.1rem;
  color: var(--nt-text-muted);
  max-width: 560px;
  line-height: 1.7;
}

/* CTA button */
.hero-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  padding: .85rem 2.2rem;
  border-radius: 999px;
  background: var(--nt-primary);
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 8px 28px rgba(22,163,74,.35);
  transition: background .2s, transform .18s, box-shadow .18s;
}
.hero-cta-btn:hover {
  background: var(--nt-primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(22,163,74,.45);
}
.hero-cta-secondary {
  background: transparent;
  color: var(--nt-primary);
  border: 2px solid var(--nt-primary);
  box-shadow: none;
}
.hero-cta-secondary:hover {
  background: var(--nt-primary-50);
  color: var(--nt-primary-dark);
  border-color: var(--nt-primary-dark);
  box-shadow: 0 6px 20px rgba(22,163,74,.2);
}

/* Note below CTA */
.hero-v2-note {
  display: flex;
  align-items: center;
  gap: .45rem;
  font-size: .82rem;
  color: var(--nt-text-muted);
}
.hero-note-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--nt-primary);
  flex-shrink: 0;
  animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 0 rgba(22,163,74,.5); }
  50%       { box-shadow: 0 0 0 5px rgba(22,163,74,0); }
}

/* ── Lịch học section ── */
#lich-hoc.bg-light {
  background: var(--nt-primary-50) !important;
}

/* ── Schedule cards ── */
.schedule-card {
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease;
  user-select: none;
  border-radius: var(--nt-radius);
  background: var(--nt-white);
  border: 1px solid var(--nt-border-light);
}
.schedule-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--nt-shadow);
}
.schedule-regular {
  background: var(--nt-primary-100);
  border-left: 3px solid var(--nt-primary);
  border-top-left-radius: var(--nt-radius);
  border-bottom-left-radius: var(--nt-radius);
}
.schedule-intensive {
  background: #fef3c7;
  border-left: 3px solid var(--nt-secondary);
  border-top-left-radius: var(--nt-radius);
  border-bottom-left-radius: var(--nt-radius);
}

/* ── Card ── */
.card {
  border: 1px solid var(--nt-border-light) !important;
  box-shadow: var(--nt-shadow-sm);
  border-radius: var(--nt-radius) !important;
  transition: box-shadow .2s ease, transform .2s ease;
  background: var(--nt-white);
}
.card:hover {
  box-shadow: var(--nt-shadow);
}

/* card-header ngày học – giữ đúng màu Bootstrap khi active */
.card-header {
  background: #f4faf6 !important;
  border-bottom: 1px solid var(--nt-border-light) !important;
  border-radius: calc(var(--nt-radius) - 1px) calc(var(--nt-radius) - 1px) 0 0 !important;
  font-weight: 600;
  font-size: 0.875rem;
}
/* Ngày hôm nay giữ màu primary */
.card-header.bg-primary {
  background: var(--nt-primary) !important;
  border-bottom-color: var(--nt-primary-dark) !important;
}

/* ── Hall of Fame ── */
#thanh-tich { background: #fff; }

.hall-card {
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
  border-radius: var(--nt-radius-lg) !important;
  border: 1px solid var(--nt-border-light) !important;
  background: var(--nt-white);
}
.hall-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--nt-shadow-lg);
  border-color: var(--nt-primary-200) !important;
}

.score-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--nt-primary) 0%, var(--nt-accent) 100%);
  color: #fff;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  font-size: 1.15rem;
  font-weight: 800;
  box-shadow: 0 4px 14px rgba(22,163,74,.35);
  letter-spacing: -0.02em;
}

/* ── Hall of fame tabs ── */
.hof-tabs .nav-link {
  background: var(--nt-primary-50);
  color: var(--nt-primary-dark);
  border: 1px solid var(--nt-primary-200);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  transition: background .18s, color .18s;
}
.hof-tabs .nav-link.active,
.hof-tabs .nav-link:hover {
  background: var(--nt-primary);
  color: #fff;
  border-color: var(--nt-primary);
}
.hof-tabs .nav-link.active .badge {
  background: var(--nt-primary-200) !important;
  color: var(--nt-primary-deeper) !important;
}

.hof-prize {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--nt-secondary);
}

/* ── Giới thiệu section ── */
.section-intro {
  background: linear-gradient(160deg, #f0fdf4 0%, #ecfdf5 100%);
  border-top: 1px solid var(--nt-border-light);
  border-bottom: 1px solid var(--nt-border-light);
}

.intro-icon-box {
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--nt-primary) 0%, var(--nt-accent) 100%);
  color: #fff;
  border-radius: 10px;
  font-size: 1.05rem;
  box-shadow: 0 4px 12px rgba(22,163,74,.25);
}

.intro-stat-card {
  background: var(--nt-white);
  border-radius: var(--nt-radius-lg);
  padding: 24px 16px;
  border: 1px solid var(--nt-border-light);
  box-shadow: var(--nt-shadow-sm);
  transition: all 0.25s ease;
}
.intro-stat-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--nt-shadow-lg);
  border-color: var(--nt-primary-200);
}

.intro-stat-icon {
  width: 54px;
  height: 54px;
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--nt-primary-100) 0%, #ecfdf5 100%);
  color: var(--nt-primary);
  border-radius: 14px;
  font-size: 1.5rem;
}
.intro-stat-number {
  font-size: 1.9rem;
  font-weight: 800;
  color: var(--nt-primary);
  line-height: 1;
  margin-bottom: 5px;
  letter-spacing: -0.03em;
}
.intro-stat-label {
  font-size: 0.8rem;
  color: var(--nt-text-muted);
  font-weight: 500;
}

/* text-muted trong section-intro */
.section-intro .text-muted { color: var(--nt-text-muted) !important; }

/* ── Why Choose Us ── */
#why-choose-us {
  background: var(--nt-white) !important;
}

.feature-card {
  padding: 28px 22px;
  border-radius: var(--nt-radius-lg);
  background: var(--nt-white);
  border: 1px solid var(--nt-border-light);
  transition: all 0.3s ease;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  box-shadow: var(--nt-shadow-sm);
}
.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--nt-shadow-lg);
  border-color: var(--nt-primary-200);
  background: var(--nt-primary-50);
}

.feature-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--nt-primary) 0%, var(--nt-accent) 100%);
  color: #fff;
  font-size: 1.4rem;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(22,163,74,.30);
}

.feature-content h5 {
  color: var(--nt-text);
  margin-bottom: 8px;
  font-size: 1rem;
  font-weight: 700;
}
.feature-content p {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--nt-text-muted);
  margin: 0;
}

@media (max-width: 576px) {
  .feature-card { padding: 20px 16px; gap: 14px; }
}

/* ── Footer ── */
footer {
  border-top: 3px solid var(--nt-primary);
}
footer a { transition: color .2s ease; }
footer a:hover { color: #fff !important; }

/* ── Admin sidebar ──
   Same dark-green (var(--nt-dark-bg)) as the public navbar/footer, so the
   whole app shares one brand chrome color instead of an unrelated one per
   portal (was purple, then peach — neither matched the green identity used
   everywhere else). */
.sidebar {
  background: var(--nt-dark-bg);
  box-shadow: 2px 0 12px rgba(17,26,20,.15);
  /* Collapse animations inside this flex column reflow every sibling below
     the opening group; contain the layout/paint cost to the sidebar itself
     so it doesn't compete with the rest of the page for frame time. */
  contain: layout style;
  overflow-anchor: none;
}
.sidebar .nav-link {
  border-radius: 8px;
  padding: 10px 14px;
  transition: background-color .2s ease, color .2s ease, box-shadow .2s ease;
  color: rgba(255,255,255,.82);
  font-size: 0.88rem;
  font-weight: 500;
}
.sidebar .nav-link:hover {
  background: rgba(255,255,255,.12);
  color: #fff;
}
.sidebar .nav-link.active {
  background: rgba(22,163,74,.40);
  color: #fff;
  font-weight: 600;
  box-shadow: 0 2px 8px rgba(22,163,74,.30);
}
/* Collapsible group headers */
.sidebar .sidebar-caret {
  transition: transform .2s ease;
  font-size: 0.75rem;
}
.sidebar .nav-link.collapsed .sidebar-caret {
  transform: rotate(-90deg);
}
.sidebar ul.nav ul.nav .nav-link {
  font-size: 0.83rem;
  padding: 8px 12px;
}
/* Snappier, cheaper collapse animation than Bootstrap's 0.35s default —
   shorter duration means less time for the per-frame reflow to be noticeable. */
.sidebar .collapsing {
  transition: height .18s ease-out;
}
@media (max-width:991px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.sidebar-open { transform: translateX(0); }
  /* Mobile sidebar overlays instead of pushing content — main content
     always gets the full viewport width regardless of the desktop
     collapsed/expanded state computed server-side. */
  #main-content { margin-left: 0 !important; max-width: 100vw !important; }
}

/* ── Attendance form ── */
.attendance-student-card {
  border: 1px solid var(--nt-border-light);
  border-radius: var(--nt-radius);
  padding: 14px;
  margin-bottom: 12px;
  transition: all .2s ease;
  background: var(--nt-white);
}
.attendance-student-card:has(input[value="absent"]:checked)  { border-color: #fca5a5; background: #fff5f5; }
.attendance-student-card:has(input[value="late"]:checked)    { border-color: #fde047; background: #fefce8; }
.attendance-student-card:has(input[value="excused"]:checked) { border-color: #cbd5e1; background: #f8fafc; }
.attendance-student-card:has(input[value="present"]:checked) { border-color: #86efac; background: #f0fdf4; }

.att-btn-group .btn {
  min-height: 44px;
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 8px;
}

/* ── Touch-friendly ── */
.btn-touch { min-height: 44px; min-width: 44px; }

/* ── Status badges ── */
.badge-present { background-color: #dcfce7; color: #14532d; border-radius: 6px; padding: 4px 8px; }
.badge-absent  { background-color: #fee2e2; color: #7f1d1d; border-radius: 6px; padding: 4px 8px; }
.badge-late    { background-color: #fef3c7; color: #78350f; border-radius: 6px; padding: 4px 8px; }
.badge-excused { background-color: #f3f4f6; color: #374151; border-radius: 6px; padding: 4px 8px; }

/* ── Finance cards ── */
.finance-card {
  border-radius: var(--nt-radius);
  background: var(--nt-white);
  border: 1px solid var(--nt-border-light);
  border-left: 4px solid var(--nt-accent);
}
.finance-card.income  { border-left-color: var(--nt-primary); }
.finance-card.expense { border-left-color: var(--nt-danger); }
.finance-card.profit  { border-left-color: var(--nt-secondary); }

/* ── Parent bottom nav ── */
.parent-bottom-nav {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 100;
  background: var(--nt-white);
  border-top: 1px solid var(--nt-border-light);
  display: flex;
  padding-bottom: env(safe-area-inset-bottom);
  box-shadow: 0 -4px 16px rgba(17,26,20,.06);
}
.parent-bottom-nav a {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px 4px 8px;
  text-decoration: none;
  color: #94a3b8;
  font-size: 0.65rem;
  gap: 4px;
  transition: all .2s ease;
  font-weight: 500;
}
.parent-bottom-nav a i { font-size: 1.3rem; }
.parent-bottom-nav a.active, .parent-bottom-nav a:hover {
  color: var(--nt-primary);
  font-weight: 600;
}
.parent-body-pad { padding-bottom: 70px; }

/* ── Alert ── */
.alert {
  border-radius: var(--nt-radius);
  border: none;
  box-shadow: var(--nt-shadow-sm);
  font-weight: 500;
}
.alert-info    { background: var(--nt-primary-100); color: var(--nt-primary-deeper); }
.alert-success { background: #dcfce7; color: #166534; }
.alert-warning { background: #fef3c7; color: #92400e; }
.alert-danger  { background: #fee2e2; color: #991b1b; }

/* ── Responsive table → card on mobile ── */
@media (max-width: 576px) {
  .table-card-mobile thead { display: none; }
  .table-card-mobile tbody tr {
    display: block;
    border: 1px solid var(--nt-border-light);
    border-radius: var(--nt-radius);
    margin-bottom: 8px;
    padding: 12px;
    background: var(--nt-white);
  }
  .table-card-mobile tbody td {
    display: flex;
    justify-content: space-between;
    border: none;
    padding: 6px 0;
    font-size: 0.875rem;
  }
  .table-card-mobile tbody td::before {
    content: attr(data-label);
    font-weight: 600;
    color: var(--nt-text);
    margin-right: 8px;
    flex-shrink: 0;
  }
}

/* ── Flash messages ── */
#flash-container .alert { animation: slideIn .3s ease; }
@keyframes slideIn {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ── Report bars ── */
.report-bar { height: 20px; border-radius: 6px; min-width: 4px; }
.table-responsive { border-radius: var(--nt-radius); }

/* ── Hero Carousel ── */
#heroCarousel { max-width: 100%; }

.carousel-slide-img {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  text-align: center;
  color: #fff;
  border-radius: var(--nt-radius-lg);
}
#heroCarousel .carousel-item {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  padding: 0;
}
#heroCarousel .carousel-inner { border-radius: var(--nt-radius-lg); }

#heroCarousel .carousel-control-prev,
#heroCarousel .carousel-control-next {
  background: rgba(255,255,255,.2);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  top: 50%;
  transform: translateY(-50%);
  backdrop-filter: blur(4px);
}
#heroCarousel .carousel-control-prev:hover,
#heroCarousel .carousel-control-next:hover { background: rgba(255,255,255,.35); }
#heroCarousel .carousel-control-prev { left: 10px; }
#heroCarousel .carousel-control-next { right: 10px; }

@media (max-width: 768px) {
  .carousel-slide-img, #heroCarousel .carousel-item { min-height: 250px; }
}
@media (max-width: 576px) {
  .carousel-slide-img, #heroCarousel .carousel-item { min-height: 200px; }
  #heroCarousel .carousel-control-prev,
  #heroCarousel .carousel-control-next { width: 40px; height: 40px; }
}

/* ── Badge ── */
.badge { font-weight: 600; font-size: 0.75rem; }
.badge.bg-primary { background-color: var(--nt-primary) !important; }

/* ── Form controls ── */
.form-select, .form-control {
  border-color: var(--nt-border);
  border-radius: 8px;
  color: var(--nt-text);
  font-size: 0.88rem;
}
.form-select:focus, .form-control:focus {
  border-color: var(--nt-primary);
  box-shadow: 0 0 0 3px rgba(22,163,74,.15);
}

/* ── Progress bar ── */
.progress { border-radius: 999px; background: var(--nt-border-light); }
.progress-bar.bg-primary { background-color: var(--nt-primary) !important; border-radius: 999px; }

/* ── Spinner ── */
.spinner-border.text-primary { color: var(--nt-primary) !important; }

/* ── Modal ── */
.modal-content {
  border: none;
  border-radius: var(--nt-radius-xl);
  box-shadow: 0 24px 80px rgba(17,26,20,.18);
}
.modal-header {
  border-bottom: 1px solid var(--nt-border-light);
  padding: 1.25rem 1.5rem;
}
.modal-body { padding: 0 1.5rem 1.5rem; }

.list-group-item {
  border-color: var(--nt-border-light);
  color: var(--nt-text);
  font-size: 0.9rem;
}

/* ── Scroll-to-top button ── */
.scroll-top-btn {
  position: fixed;
  bottom: 100px;
  right: 20px;
  z-index: 1050;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: none;
  background: var(--nt-primary);
  color: #fff;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(22,163,74,.4);
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .25s, transform .25s, background .2s;
  pointer-events: none;
}
.scroll-top-btn.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.scroll-top-btn:hover {
  background: var(--nt-primary-dark);
}

/* ── Social Widget ── */
.social-widget-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
}
.social-widget-toggle {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--nt-primary) 0%, var(--nt-accent) 100%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 20px rgba(22,163,74,.50);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  font-size: 1.5rem;
  border: none;
  padding: 0;
}
.social-widget-toggle:hover {
  transform: scale(1.1) rotate(10deg);
  box-shadow: 0 8px 28px rgba(22,163,74,.60);
}
.social-widget-toggle.active {
  background: linear-gradient(135deg, #ef4444 0%, #f87171 100%);
  transform: scale(1.1) rotate(-10deg);
}

.social-widget-popup {
  position: absolute;
  bottom: 70px;
  right: 0;
  width: 280px;
  background: var(--nt-white);
  border-radius: var(--nt-radius-lg);
  box-shadow: 0 16px 48px rgba(17,26,20,.18);
  overflow: hidden;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px) scale(0.95);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  pointer-events: none;
  border: 1px solid var(--nt-border-light);
}
.social-widget-popup.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.social-widget-header {
  background: linear-gradient(135deg, var(--nt-dark-bg) 0%, #166534 100%);
  color: #fff;
  padding: 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.social-widget-header h6 {
  color: #fff;
  font-weight: 700;
  margin: 0;
  font-size: 0.92rem;
}

.social-widget-body {
  padding: 8px 0;
  max-height: 280px;
  overflow-y: auto;
}
.social-widget-body::-webkit-scrollbar { width: 4px; }
.social-widget-body::-webkit-scrollbar-track { background: transparent; }
.social-widget-body::-webkit-scrollbar-thumb { background: var(--nt-border); border-radius: 2px; }

.social-widget-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  color: var(--nt-text);
  text-decoration: none;
  transition: all 0.2s ease;
  border-left: 3px solid transparent;
  font-weight: 500;
  font-size: 0.9rem;
}
.social-widget-link:hover {
  background: var(--nt-primary-50);
  border-left-color: var(--nt-primary);
  transform: translateX(4px);
  color: var(--nt-text);
}
.social-widget-link i {
  font-size: 1.3rem;
  min-width: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.social-widget-link.zalo-link:hover i      { color: #00cd40; transform: scale(1.15); }
.social-widget-link.messenger-link:hover i { color: #0084ff; transform: scale(1.15); }
.social-widget-link.phone-link:hover i     { color: #16a34a; transform: scale(1.15); }

@media (max-width: 576px) {
  .social-widget-container { bottom: 16px; right: 16px; }
  .social-widget-toggle { width: 52px; height: 52px; font-size: 1.3rem; }
  .social-widget-popup { width: 260px; }
}

/* ── Pagination — global override, used on ~20 list pages ──
   Bootstrap's default is fused squares with hairline borders; this gives
   every page the same spaced, rounded, on-brand look in one place instead
   of restyling each page's markup individually. */
.pagination .page-link {
  border: none;
  border-radius: 8px !important;
  margin: 0 3px;
  min-width: 32px;
  text-align: center;
  color: var(--nt-text-muted, #4b6358);
  font-weight: 600;
  transition: background-color .15s ease, color .15s ease;
}
.pagination .page-link:hover {
  background: var(--nt-primary-100, #dcfce7);
  color: var(--nt-primary-dark, #15803d);
}
.pagination .page-item.active .page-link {
  background: var(--nt-primary, #16a34a);
  color: #fff;
  box-shadow: 0 2px 6px rgba(22,163,74,.35);
}
.pagination .page-item.disabled .page-link {
  background: transparent;
  color: #c3ccc7;
}

.exam-answer-explanation {
  line-height: 1.35;
}
.exam-answer-explanation-content > p {
  margin: 0;
}

/* ── Admin circular pastel action buttons — shared across list pages
   (accounts, permission groups, leave requests, ...) so the same row of
   Sửa/Khóa/Xoá-style icons looks identical everywhere. ── */
.acct-action-btn {
  width: 36px; height: 36px; border-radius: 50%; border: none; padding: 0;
  display: flex; align-items: center; justify-content: center; font-size: .9rem;
  transition: all .2s ease;
}
.acct-action-edit    { background: #f1f5f9; color: #475569; }
.acct-action-edit:hover    { background: #e2e8f0; }
.acct-action-perm    { background: #e2f9df; color: #1b5e20; }
.acct-action-perm:hover    { background: #c9f2c3; }
.acct-action-pwd     { background: #fef3c7; color: #b45309; }
.acct-action-pwd:hover     { background: #fde9a8; }
.acct-action-toggle  { background: #ffedd5; color: #c2410c; }
.acct-action-toggle:hover  { background: #fdd9ae; }
.acct-action-delete  { background: #fee2e2; color: #991b1b; }
.acct-action-delete:hover  { background: #fdc9c9; }

.exam-take-page { max-width: 720px; }
.exam-take-toolbar { top: calc(56px + env(safe-area-inset-top)); z-index: 90; }
.exam-take-toolbar-title { min-width: 0; }
.exam-take-title,
.exam-take-subtitle { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.exam-question-title,
.exam-answer-option > span { min-width: 0; overflow-wrap: anywhere; }
.exam-answer-option { cursor: pointer; }
.exam-bottom-actions button { min-height: 48px; }

@media (max-width: 576px) {
  .exam-take-page { padding: .5rem .65rem 1rem; }
  .exam-take-toolbar .card-body { padding: .5rem .6rem; }
  .exam-take-title { font-size: .9rem; }
  .exam-take-subtitle { font-size: .7rem !important; }
  .exam-take-toolbar .btn { min-height: 42px; padding: .35rem .55rem !important; white-space: nowrap; }
  .exam-take-toolbar .fs-5 { font-size: 1rem !important; }
  .exam-take-toolbar-caption { display: none; }
  .exam-take-page .alert { padding: .6rem .7rem; line-height: 1.4; }
  .exam-question-group-heading { margin-top: 1.25rem !important; }
  .exam-take-page [data-exam-question] .card-body { padding: .85rem .75rem; }
  .exam-question-title { font-size: .98rem; }
  .exam-answer-option { min-height: 50px; padding: .65rem .7rem; align-items: flex-start !important; }
  .exam-answer-radio { flex: 0 0 auto; width: 1.15em; height: 1.15em; margin-top: .2rem !important; }
  .exam-true-false-row { display: grid !important; grid-template-columns: minmax(0, 1fr) auto; }
  .exam-true-false-row > span { grid-column: 1 / -1; }
  .exam-choice-button { min-width: 64px; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }
  .exam-take-page input[type="text"],
  .exam-take-page textarea { font-size: 16px; }
  .exam-bottom-actions button { min-height: 50px; }
  .exam-take-page mjx-container[display="true"] {
    display: block;
    max-width: 100%;
    overflow-x: auto;
    overflow-y: hidden;
  }
}

.exam-folder-card {
  transition: transform .15s ease, box-shadow .15s ease;
}
.exam-folder-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--nt-shadow) !important;
}
.exam-list-row { cursor: context-menu; }
.exam-list-row .exam-context-trigger { cursor: pointer; }
.exam-context-menu {
  position: fixed;
  z-index: 1100;
  min-width: 250px;
  max-width: min(320px, calc(100vw - 16px));
  max-height: calc(100vh - 16px);
  overflow-y: auto;
  padding: .4rem;
  border: 1px solid var(--nt-border-light);
  border-radius: 12px;
  background: var(--nt-white);
}
.exam-context-menu[hidden] { display: none; }
.exam-context-menu.show { display: block; }
.exam-context-item {
  display: flex;
  width: 100%;
  min-height: 42px;
  align-items: center;
  gap: .75rem;
  padding: .55rem .7rem;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--nt-text);
  text-align: left;
  text-decoration: none;
  font: inherit;
  cursor: pointer;
}
.exam-context-item:hover,
.exam-context-item:focus-visible {
  background: var(--nt-primary-50);
  color: var(--nt-primary-dark);
  outline: none;
}
.exam-context-item i { width: 1.1rem; text-align: center; }
.exam-context-item:disabled { color: var(--nt-text-muted); opacity: .55; cursor: not-allowed; }
.exam-context-divider { margin: .35rem 0; border-top: 1px solid var(--nt-border-light); }
@media (max-width: 576px) {
  .exam-list-table th,
  .exam-list-table td { padding: .55rem .45rem; font-size: .82rem; }
  .exam-context-menu { min-width: 230px; }
}