/* ═══════════════════════════════════════════════════════════════
   MIMO KIDS QUIZ STUDIO — Design System (kiến trúc chuyên đề)
   Candy-glass: gradient tím – xanh pastel, Plus Jakarta Sans,
   màu môn học đồng bộ app (Toán 🦊 cam • Tiếng Việt 🐰 hồng • Anh 🦉 xanh).
   ═══════════════════════════════════════════════════════════════ */

:root {
  --bg: #f3f5fb;
  --surface: #ffffff;
  --ink: #1d2033;
  --ink-soft: #5a6080;
  --ink-faint: #9aa1c0;
  --line: #e4e8f4;

  --primary: #6a5cff;
  --primary-deep: #5846e8;
  --primary-soft: #eeebff;
  --orange: #ff8a3d;
  --pink: #ff5c8a;
  --green: #1fb574;
  --amber: #ffb020;
  --teal: #14b8a6;

  --grad-primary: linear-gradient(135deg, #6a5cff, #9f7bff);
  --grad-violet: linear-gradient(135deg, #7c6bff, #b18cff);
  --grad-orange: linear-gradient(135deg, #ff9a4d, #ff6a3d);
  --grad-green: linear-gradient(135deg, #2ed58f, #0fb372);
  --grad-pink: linear-gradient(135deg, #ff7aa5, #ff4d7e);

  --radius: 16px;
  --shadow-sm: 0 1px 3px rgba(29,32,51,.07), 0 4px 14px rgba(29,32,51,.05);
  --shadow-md: 0 6px 24px rgba(29,32,51,.12);
  --shadow-pop: 0 18px 50px rgba(60,40,160,.28);
  --ease: cubic-bezier(.22,.8,.36,1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Plus Jakarta Sans', 'Segoe UI', system-ui, sans-serif;
  background:
    radial-gradient(900px 500px at 85% -10%, #efe7ff 0%, transparent 60%),
    radial-gradient(700px 420px at -10% 30%, #e3f2ff 0%, transparent 55%),
    var(--bg);
  color: var(--ink);
  min-height: 100vh;
}

/* ══════════════════ LAYOUT ══════════════════ */

.app-shell {
  display: grid;
  grid-template-columns: 264px 1fr;
  min-height: 100vh;
  transition: grid-template-columns 0.25s var(--ease);
}

/* ══════════════════ SIDEBAR ══════════════════ */

.sidebar {
  background: linear-gradient(180deg, #221a4e 0%, #1a1440 55%, #171236 100%);
  color: #cfc9f2;
  display: flex;
  flex-direction: column;
  padding: 20px 16px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: hidden;
  z-index: 100;
  transition: transform 0.28s var(--ease);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 4px 6px 18px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.brand-badge {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: transparent;
  display: grid;
  place-items: center;
  box-shadow: 0 4px 14px rgba(33, 176, 117, 0.35);
  overflow: hidden;
  flex-shrink: 0;
}
.brand-mascot-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform 0.25s var(--ease);
}
.brand-badge:hover .brand-mascot-img {
  transform: scale(1.08) rotate(3deg);
}
.brand-text {
  flex: 1;
  min-width: 0;
}
.brand-text h1 {
  font-family: 'Nunito', 'Plus Jakarta Sans', sans-serif;
  font-size: 19px;
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.3px;
  line-height: 1.2;
}
.brand-text p {
  font-size: 11px;
  color: #a5b4fc;
  font-weight: 600;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.btn-sidebar-close {
  display: none;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #cfc9f2;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.18s ease;
  flex-shrink: 0;
}
.btn-sidebar-close:hover {
  background: rgba(239, 68, 68, 0.25);
  color: #fca5a5;
  border-color: rgba(239, 68, 68, 0.35);
}

/* Sidebar Backdrop for Drawer */
.sidebar-backdrop {
  display: none;
}

.nav { flex: 1; padding-top: 14px; overflow-y: auto; }
.nav-section-title {
  font-size: 10.5px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 1.6px; color: #7e73c0; padding: 14px 12px 8px;
}
.nav-item {
  display: flex; align-items: center; gap: 11px; width: 100%;
  padding: 11px 14px; margin-bottom: 4px;
  border: none; border-radius: 12px; background: transparent;
  color: #b6aeea; font-family: inherit; font-size: 13.5px; font-weight: 600;
  cursor: pointer; text-decoration: none;
  transition: all .18s var(--ease);
}
.nav-icon { font-size: 17px; width: 22px; text-align: center; }
.nav-item:hover { background: rgba(255,255,255,.07); color: #fff; transform: translateX(2px); }
.nav-item.active { background: var(--grad-primary); color: #fff; box-shadow: 0 8px 20px rgba(106,92,255,.4); }

.sidebar-footer { border-top: 1px solid rgba(255,255,255,.08); padding-top: 14px; }
.status-line { display: flex; align-items: center; gap: 8px; font-size: 12px; font-weight: 600; color: #b6aeea; padding: 0 6px 6px; }
.db-status-line { display: flex; align-items: center; gap: 8px; font-size: 11.5px; font-weight: 600; color: #a5b4fc; padding: 0 6px 10px; }
.db-status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #10b981; box-shadow: 0 0 8px rgba(16, 185, 129, 0.7);
}
.db-status-dot.offline { background: #ef4444; box-shadow: none; }
.status-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--amber); animation: pulse 1.6s infinite;
}
.status-dot.online { background: #2ed58f; }
.status-dot.offline { background: #ff5c5c; animation: none; }
@keyframes pulse { 0% { opacity: 1; } 70% { opacity: .4; } 100% { opacity: 1; } }

.academic-week-card {
  background: rgba(255,255,255,.07); border: 1px solid rgba(255,255,255,.1);
  border-radius: 12px; padding: 10px 12px;
  font-size: 12.5px; color: #d8d2f7; font-weight: 600; line-height: 1.5;
}

/* ══════════════════ APP TOPBAR & 3-BAR HAMBURGER ══════════════════ */

.app-topbar {
  position: sticky;
  top: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 24px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  margin: -30px -34px 24px -34px;
  box-shadow: 0 1px 3px rgba(29, 32, 51, 0.04);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.btn-menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.18s var(--ease);
  box-shadow: 0 1px 3px rgba(29, 32, 51, 0.04);
}
.btn-menu-toggle:hover {
  background: var(--primary-soft);
  color: var(--primary);
  border-color: #c7d2fe;
  transform: translateY(-1px);
}
.btn-menu-toggle:active {
  transform: scale(0.95);
}

.topbar-brand {
  display: none;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.topbar-logo {
  width: 26px;
  height: 26px;
  object-fit: contain;
}
.topbar-title {
  font-family: 'Nunito', 'Plus Jakarta Sans', sans-serif;
  font-size: 15px;
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.2px;
}
.topbar-title strong {
  color: var(--primary);
}

.topbar-current-view {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--ink-soft);
  padding-left: 12px;
  border-left: 1.5px solid var(--line);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.topbar-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 99px;
  background: #f1f4fb;
  color: var(--ink-soft);
  border: 1px solid var(--line);
}
.topbar-badge .badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary);
}
.topbar-db-badge .db-status-dot {
  width: 7px;
  height: 7px;
}

.topbar-user {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 6px 4px 10px;
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 99px;
}
.user-avatar-sm {
  font-size: 13px;
}
.user-name-sm {
  font-size: 12px;
  font-weight: 700;
  color: var(--ink);
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.btn-logout-topbar {
  background: transparent;
  border: none;
  font-size: 13px;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 6px;
  line-height: 1;
  transition: transform 0.15s ease;
}
.btn-logout-topbar:hover {
  transform: scale(1.15);
}

/* ══════════════════ MAIN ══════════════════ */

.main {
  padding: 30px 34px 50px;
  max-width: 1380px;
  min-width: 0;
  width: 100%;
}

.view { display: none; animation: viewIn .3s var(--ease); }
.view.active { display: block; }
@keyframes viewIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.view-header { display: flex; align-items: flex-end; justify-content: space-between; gap: 18px; margin-bottom: 24px; flex-wrap: wrap; }
.view-header h2 { font-size: 25px; font-weight: 800; letter-spacing: -.3px; }
.view-subtitle { color: var(--ink-soft); font-size: 13.5px; margin-top: 4px; font-weight: 500; }
.header-actions { display: flex; gap: 10px; }

/* ══════════════════ BUTTONS ══════════════════ */

.btn {
  border: none; border-radius: 12px; padding: 11px 20px;
  font-family: inherit; font-size: 14px; font-weight: 700; cursor: pointer;
  transition: all .18s var(--ease);
  display: inline-flex; align-items: center; gap: 7px; white-space: nowrap;
}
.btn:active { transform: scale(.96); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--grad-primary); color: #fff; box-shadow: 0 8px 20px rgba(106,92,255,.35); }
.btn-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(106,92,255,.45); }
.btn-secondary { background: var(--surface); color: var(--ink); border: 1.5px solid var(--line); box-shadow: var(--shadow-sm); }
.btn-secondary:hover:not(:disabled) { border-color: #c9cdea; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-danger { background: #fff0f4; color: var(--pink); border: 1.5px solid #ffd3de; }
.btn-danger:hover { background: #ffe3eb; }
.btn-sm { padding: 8px 14px; font-size: 13px; border-radius: 10px; }

/* ══════════════════ CARDS & STATS ══════════════════ */

.card {
  background: var(--surface); border-radius: var(--radius);
  box-shadow: var(--shadow-sm); border: 1px solid rgba(228,232,244,.8); padding: 22px;
}
.card-head { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-bottom: 18px; }
.card-head h3 { font-size: 16.5px; font-weight: 800; }

.stat-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(215px, 1fr)); gap: 16px; margin-bottom: 22px; }
.stat-card {
  background: var(--surface); border-radius: var(--radius);
  border: 1px solid rgba(228,232,244,.8); box-shadow: var(--shadow-sm);
  padding: 18px; display: flex; align-items: center; gap: 15px;
  transition: all .2s var(--ease);
}
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.stat-icon {
  width: 52px; height: 52px; border-radius: 15px;
  display: grid; place-items: center; font-size: 24px; flex-shrink: 0; color: #fff;
}
.grad-violet { background: var(--grad-violet); box-shadow: 0 8px 18px rgba(124,107,255,.35); }
.grad-orange { background: var(--grad-orange); box-shadow: 0 8px 18px rgba(255,138,61,.35); }
.grad-green { background: var(--grad-green); box-shadow: 0 8px 18px rgba(31,181,116,.35); }
.grad-pink { background: var(--grad-pink); box-shadow: 0 8px 18px rgba(255,92,138,.35); }
.stat-value { font-size: 23px; font-weight: 800; letter-spacing: -.5px; }
.stat-label { font-size: 12.5px; color: var(--ink-soft); font-weight: 600; margin-top: 2px; }

/* ══════════════════ TIMELINE CHUYÊN ĐỀ (bản lớn, dễ đọc) ══════════════════ */

.legend { display: flex; gap: 13px; flex-wrap: wrap; }
.legend-item { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-soft); font-weight: 600; }
.swatch { width: 12px; height: 12px; border-radius: 4px; display: inline-block; }
.sw-math { background: var(--grad-orange); }
.sw-viet { background: var(--grad-pink); }
.sw-eng { background: var(--grad-green); }
.sw-logic { background: linear-gradient(135deg, #ffc44d, #ff9d1c); }
.sw-custom { background: var(--teal); }
.sw-now { background: #fff; border: 2.5px solid var(--green); }

.timeline { display: flex; flex-direction: column; gap: 16px; }

.tl-grade { border: 1px solid var(--line); border-radius: 16px; background: #fbfcff; overflow: visible; }

.tl-head {
  display: flex; align-items: center; gap: 14px;
  padding: 10px 14px;
  background: linear-gradient(90deg, #f4f2ff, #fbfcff);
  border: none; border-radius: 16px;
  cursor: pointer; width: 100%;
  font-family: inherit;
  transition: background .15s var(--ease);
}
.tl-head:hover { background: #edebff; }
.tl-head .grade-label {
  font-size: 13px; font-weight: 800; color: var(--ink);
  width: 74px; flex-shrink: 0; text-align: center;
  background: #fff; border: 1.5px solid var(--line); border-radius: 10px; padding: 6px 0;
}
.tl-grade-meta { font-size: 11.5px; font-weight: 700; color: var(--ink-faint); flex-shrink: 0; }
.tl-toggle { font-size: 13px; color: var(--ink-soft); flex-shrink: 0; width: 16px; }

/* Bản đồ mini trong tiêu đề: 3 dải màu mảnh, không chữ — tổng quan nhẹ nhàng */
.tl-minis { flex: 1; display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.tl-mini-lane {
  display: grid; grid-template-columns: repeat(35, 1fr); gap: 2px;
  height: 10px; border-radius: 4px; background: #f0f2fa;
}
.tl-mini-seg { border-radius: 4px; }
.tl-mini-now {
  border-radius: 4px;
  background: rgba(31, 181, 116, .15);
  box-shadow: inset 0 0 0 2px var(--green);
}

.tl-body { padding: 10px 14px 14px; }
.tl-grade.collapsed .tl-body { display: none; }

.tl-lane-row { display: flex; align-items: stretch; gap: 12px; margin-bottom: 8px; }
.tl-lane-row:last-child { margin-bottom: 0; }
.tl-ruler-row { margin-bottom: 6px; border-bottom: 1px solid var(--line); padding-bottom: 4px; }
.tl-ruler { display: grid; grid-template-columns: repeat(35, 1fr); gap: 2px; flex: 1; }
.tl-ruler-cell {
  font-size: 10px; font-weight: 800; color: var(--ink-faint);
  text-align: center; padding: 3px 0; border-radius: 5px;
}
.tl-ruler-cell.exam { color: var(--pink); font-size: 12px; }
.tl-ruler-cell.current { background: var(--green); color: #fff; }

.tl-label {
  width: 104px; flex-shrink: 0;
  font-size: 12px; font-weight: 800; color: var(--ink-soft);
  text-align: right; padding-right: 2px;
  display: flex; flex-direction: column; justify-content: center; gap: 2px;
}
.tl-label-count { font-size: 10px; font-weight: 700; color: var(--ink-faint); }
.tl-ruler-row .tl-label { border-bottom: none; }

.tl-lane {
  display: grid; grid-template-columns: repeat(35, 1fr); gap: 3px;
  flex: 1; min-height: 48px;
  background: #f7f9fe;
  border-radius: 10px;
}

.tl-seg {
  position: relative; z-index: 1;
  border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  padding: 4px 8px; color: #fff;
  cursor: pointer; overflow: visible;
  transition: transform .15s var(--ease), box-shadow .15s var(--ease), filter .15s;
}
.tl-seg:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 18px rgba(29,32,51,.28);
  filter: brightness(1.12);
  z-index: 10;
}
.tl-seg-name {
  font-size: 11.5px; font-weight: 700; line-height: 1.25;
  text-align: center; white-space: normal;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
  overflow: hidden;
}
.seg-math { background: #ff8a3d; }
.seg-viet { background: #ff5c8a; }
.seg-eng { background: #1fb574; }
.seg-logic { background: #ffb020; }
.seg-custom { background: #14b8a6; }
.tl-mini-seg.seg-math { background: #ffb888; }
.tl-mini-seg.seg-viet { background: #ffa5bf; }
.tl-mini-seg.seg-eng { background: #7ddbb4; }
.tl-mini-seg.seg-logic { background: #ffd28a; }
.tl-mini-seg.seg-custom { background: #86e0d5; }

.tl-now {
  position: relative; z-index: 5; pointer-events: none;
  border-radius: 4px;
  background: rgba(31, 181, 116, .14);
  box-shadow: inset 0 0 0 2.5px var(--green);
}
.tl-now::after {
  content: '⬤';
  position: absolute; top: -7px; left: 50%; transform: translateX(-50%);
  color: var(--green); font-size: 9px;
}
.tl-empty { font-size: 12px; color: var(--ink-faint); font-weight: 600; align-self: center; padding-left: 8px; }

/* Popover chi tiết chuyên đề khi hover */
.tl-pop {
  display: none; position: absolute; bottom: calc(100% + 10px); left: 50%;
  transform: translateX(-50%);
  background: #23263d; color: #fff;
  border-radius: 12px; padding: 12px 15px;
  width: max-content; max-width: 280px;
  box-shadow: var(--shadow-md);
  z-index: 20; pointer-events: none;
  text-align: center;
}
.tl-seg:hover .tl-pop { display: block; }
.tl-pop::after {
  content: ''; position: absolute; top: 100%; left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent; border-top-color: #23263d;
}
.tl-pop-title { font-size: 13px; font-weight: 800; margin-bottom: 6px; line-height: 1.4; }
.tl-pop-meta { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; font-size: 11px; font-weight: 700; opacity: .85; }

.hint { font-size: 12.5px; color: var(--ink-faint); margin-top: 14px; font-weight: 500; line-height: 1.6; }

/* ══════════════════ MEDIA (ảnh / âm thanh) ══════════════════ */

.badge-media { background: #e6f7f4; color: #0d9488; }

.view-media {
  border: 1.5px solid var(--line); border-radius: 12px;
  padding: 12px; margin-bottom: 14px; background: #fbfcff;
}
.view-media-label { font-size: 12px; font-weight: 800; color: var(--ink-soft); margin-bottom: 8px; }
.view-media img { max-width: 100%; max-height: 280px; border-radius: 9px; display: block; }
.view-media audio { width: 100%; }

.preview-img {
  max-width: 100%; max-height: 200px; border-radius: 10px;
  border: 1px solid var(--line); margin-bottom: 12px; display: block;
}

.media-input-row { display: flex; gap: 8px; align-items: center; }
.media-input-row .form-control { flex: 1; min-width: 0; }

.import-upload-box {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  background: #f6f5ff; border: 1.5px dashed #cfc9f5; border-radius: 12px;
  padding: 11px 14px; margin-bottom: 16px;
}
.import-upload-box .hint { margin: 0; flex: 1; min-width: 200px; }

/* ══════════════════ FORM ══════════════════ */

.form-group { margin-bottom: 18px; }
.form-label { display: block; font-size: 12.5px; font-weight: 700; color: var(--ink-soft); margin-bottom: 8px; text-transform: uppercase; letter-spacing: .6px; }
.form-control {
  width: 100%; padding: 11px 14px;
  border: 1.5px solid var(--line); border-radius: 11px;
  font-family: inherit; font-size: 14px; color: var(--ink);
  background: #fbfcff; transition: all .18s var(--ease); outline: none;
}
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(106,92,255,.13); background: #fff; }
textarea.form-control { resize: vertical; line-height: 1.55; }
textarea.mono { font-family: ui-monospace, 'Cascadia Code', Consolas, monospace; font-size: 13px; }
select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath fill='%235a6080' d='M1.5 1.3 6 5.8l4.5-4.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 13px center;
  padding-right: 34px; cursor: pointer;
}
.form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.range { width: 100%; accent-color: var(--primary); cursor: pointer; height: 28px; }

/* ══════════════════ PILLS ══════════════════ */

.pill-row { display: flex; gap: 8px; flex-wrap: wrap; }
.pill {
  border: 1.5px solid var(--line); background: #fbfcff; color: var(--ink-soft);
  border-radius: 999px; padding: 8px 16px;
  font-family: inherit; font-size: 13.5px; font-weight: 700; cursor: pointer;
  transition: all .16s var(--ease);
}
.pill:hover { border-color: #c9cdea; transform: translateY(-1px); }
.pill.active { color: #fff; border-color: transparent; }
.pill.p-math.active { background: var(--grad-orange); box-shadow: 0 6px 14px rgba(255,138,61,.35); }
.pill.p-viet.active { background: var(--grad-pink); box-shadow: 0 6px 14px rgba(255,92,138,.35); }
.pill.p-eng.active { background: var(--grad-green); box-shadow: 0 6px 14px rgba(31,181,116,.35); }
.pill.p-grade.active { background: var(--grad-primary); box-shadow: 0 6px 14px rgba(106,92,255,.3); }

/* ══════════════════ GENERATOR ══════════════════ */

.gen-layout { display: grid; grid-template-columns: 380px 1fr; gap: 20px; align-items: start; }
.gen-form-card { position: sticky; top: 30px; }
.btn-row { display: flex; gap: 10px; }
.btn-row .btn { flex: 1; justify-content: center; }

.gen-preview-col { display: flex; flex-direction: column; gap: 14px; }
.empty-state {
  background: var(--surface); border: 1.5px dashed #d6dcf0; border-radius: var(--radius);
  padding: 60px 20px; text-align: center; color: var(--ink-faint);
  font-size: 14px; font-weight: 600; line-height: 1.8;
}
.empty-emoji { font-size: 42px; margin-bottom: 10px; }
.preview-list { display: flex; flex-direction: column; gap: 14px; }

.q-card {
  background: var(--surface); border-radius: var(--radius);
  border: 1px solid rgba(228,232,244,.8); box-shadow: var(--shadow-sm);
  padding: 18px 20px; animation: cardIn .35s var(--ease) backwards;
}
@keyframes cardIn { from { opacity: 0; transform: translateY(10px) scale(.98); } to { opacity: 1; transform: none; } }
.q-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.q-id { font-size: 11px; color: var(--ink-faint); font-weight: 700; font-family: ui-monospace, monospace; }

.badge { font-size: 11px; font-weight: 800; padding: 4px 10px; border-radius: 999px; letter-spacing: .3px; }
.badge-math { background: #fff1e6; color: #e06a1b; }
.badge-vietnamese { background: #ffe9f0; color: #e0426f; }
.badge-english { background: #e5f9f0; color: #12945c; }
.badge-easy { background: #e8f7ef; color: #178a53; }
.badge-medium { background: #fff6e5; color: #b87700; }
.badge-hard { background: #feecec; color: #d53434; }
.badge-type { background: #eef0fb; color: #5a6080; }

.q-text { font-size: 15.5px; font-weight: 700; line-height: 1.6; margin-bottom: 13px; white-space: pre-line; }
.q-options { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; margin-bottom: 12px; }
.q-option {
  display: flex; align-items: center; gap: 10px;
  border: 1.5px solid var(--line); border-radius: 11px; padding: 10px 13px;
  font-size: 14px; font-weight: 600; background: #fbfcff; transition: all .15s var(--ease);
}
.q-option.correct {
  border-color: #37c58a; background: #e9faf2; color: #0e8a55;
  box-shadow: 0 4px 12px rgba(55,197,138,.18);
}
.q-letter {
  width: 24px; height: 24px; border-radius: 8px; background: #eef0fb;
  display: grid; place-items: center; font-size: 12px; font-weight: 800; color: var(--ink-soft); flex-shrink: 0;
}
.q-option.correct .q-letter { background: #37c58a; color: #fff; }
.q-explain {
  display: flex; gap: 8px; align-items: flex-start;
  background: #f6f5ff; border-radius: 10px; padding: 10px 13px;
  font-size: 13px; color: var(--primary-deep); font-weight: 600; line-height: 1.55;
}

/* ══════════════════ TOPIC CARDS ══════════════════ */

.filter-card { padding: 16px 18px; margin-bottom: 18px; }

.topic-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; margin-bottom: 18px; }

.topic-card {
  background: var(--surface); border-radius: 14px; border: 1px solid var(--line);
  box-shadow: var(--shadow-sm); overflow: hidden; cursor: pointer;
  display: flex; flex-direction: column;
  transition: all .18s var(--ease);
  animation: cardIn .3s var(--ease) backwards;
  position: relative;
}
.topic-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: #c9cdea; }
.topic-card.selected { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(106,92,255,.18), var(--shadow-md); }

.topic-kind-stripe { height: 5px; }
.stripe-core { background: var(--grad-primary); }
.stripe-logic { background: linear-gradient(135deg, #ffc44d, #ff9d1c); }
.stripe-custom { background: linear-gradient(135deg, #2dd4bf, #0d9488); }

.topic-card-body { padding: 14px 16px; }
.topic-card-name { font-size: 14px; font-weight: 800; line-height: 1.45; margin-bottom: 10px; min-height: 40px; }
.topic-card-meta { display: flex; gap: 6px; flex-wrap: wrap; }

.topic-add {
  border: 2px dashed #cdd5ec; background: transparent; box-shadow: none;
  align-items: center; justify-content: center; min-height: 110px;
}
.topic-add:hover { border-color: var(--primary); background: var(--primary-soft); transform: translateY(-3px); }
.topic-add-inner {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  color: var(--ink-soft); font-weight: 700; font-size: 13.5px;
}

.topic-detail { animation: viewIn .3s var(--ease); }
.topic-detail.hidden { display: none; }
.topic-detail-head {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 14px; flex-wrap: wrap; margin-bottom: 16px; padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.topic-detail-title h3 { font-size: 18px; font-weight: 800; margin-bottom: 8px; }
.topic-detail-chips { display: flex; gap: 7px; flex-wrap: wrap; }
.bank-week-chip {
  font-size: 11px; font-weight: 800; color: var(--primary-deep);
  background: var(--primary-soft); border-radius: 7px; padding: 3px 8px;
}

/* ══════════════════ BANK LIST ══════════════════ */

.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.filter-bar select.form-control { width: auto; min-width: 130px; }
.search-box { position: relative; flex: 1; min-width: 220px; }
.search-icon { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); font-size: 14px; opacity: .5; }
.search-box .form-control { padding-left: 38px; }

.bank-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  margin-bottom: 14px; font-size: 13.5px; color: var(--ink-soft); font-weight: 700;
}
.bank-list { display: flex; flex-direction: column; gap: 10px; }
.bank-row {
  display: flex; align-items: center; gap: 14px;
  border: 1px solid var(--line); border-radius: 13px; padding: 13px 16px;
  background: #fdfdff; transition: all .16s var(--ease);
  animation: cardIn .3s var(--ease) backwards;
}
.bank-row:hover { border-color: #c9cdea; box-shadow: var(--shadow-sm); transform: translateX(3px); }
.bank-row-main { flex: 1; min-width: 0; }
.bank-row-q { font-size: 14px; font-weight: 700; line-height: 1.5; margin-bottom: 4px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bank-row-meta { display: flex; gap: 7px; align-items: center; flex-wrap: wrap; }
.bank-actions { display: flex; gap: 7px; flex-shrink: 0; }
.icon-btn {
  width: 34px; height: 34px; border-radius: 10px;
  border: 1.5px solid var(--line); background: #fff;
  cursor: pointer; font-size: 14px; display: grid; place-items: center;
  transition: all .15s var(--ease);
}
.icon-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }
.icon-btn.danger:hover { background: #fff0f4; border-color: #ffd3de; }

.bank-foot {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--line);
  font-size: 13px; color: var(--ink-soft); font-weight: 700;
}
.page-btn {
  border: 1.5px solid var(--line); background: #fff; border-radius: 9px;
  padding: 7px 13px; font-family: inherit; font-size: 13px; font-weight: 700;
  color: var(--ink); cursor: pointer; transition: all .15s var(--ease);
}
.page-btn:hover:not(:disabled) { border-color: var(--primary); color: var(--primary); }
.page-btn:disabled { opacity: .4; cursor: not-allowed; }

/* ══════════════════ MODAL ══════════════════ */

.modal-overlay {
  position: fixed; inset: 0; background: rgba(23,18,54,.55);
  backdrop-filter: blur(6px); display: grid; place-items: center;
  z-index: 100; animation: fadeIn .2s var(--ease); padding: 20px;
}
.modal-overlay.hidden { display: none; }
@keyframes fadeIn { from { opacity: 0; } }

.modal-container {
  width: 100%; max-width: 560px; background: var(--surface);
  border-radius: 20px; box-shadow: var(--shadow-pop);
  animation: modalIn .3s var(--ease); max-height: 92vh;
  display: flex; flex-direction: column; overflow: hidden;
}
.modal-container.modal-wide { max-width: 700px; }
@keyframes modalIn { from { opacity: 0; transform: translateY(22px) scale(.96); } to { opacity: 1; transform: none; } }

.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 18px 24px; border-bottom: 1px solid var(--line); }
.modal-header h3 { font-size: 16px; font-weight: 800; }
.modal-close {
  width: 32px; height: 32px; border: none; border-radius: 9px;
  background: #f1f3fa; font-size: 13px; cursor: pointer; transition: all .15s var(--ease);
}
.modal-close:hover { background: #e8ebf6; transform: rotate(90deg); }
.modal-body { padding: 20px 24px; overflow-y: auto; }
.modal-footer { display: flex; justify-content: flex-end; gap: 10px; padding: 16px 24px; border-top: 1px solid var(--line); background: #fbfcff; }

.import-result { border-radius: 12px; padding: 13px 16px; font-size: 13.5px; font-weight: 600; line-height: 1.6; }
.import-result.ok { background: #e9faf2; color: #0e8a55; }
.import-result.err { background: #fff0f0; color: #c02929; }
.import-result.hidden { display: none; }
.import-errors { margin-top: 8px; color: #b87700; font-weight: 500; }
.import-errors ul { margin: 4px 0 0 18px; }

/* ══════════════════ TOAST ══════════════════ */

.toast-container { position: fixed; bottom: 24px; right: 24px; display: flex; flex-direction: column; gap: 10px; z-index: 200; }
.toast {
  display: flex; align-items: center; gap: 11px;
  background: #23263d; color: #fff; border-radius: 13px; padding: 13px 18px;
  font-size: 14px; font-weight: 600; box-shadow: var(--shadow-md);
  animation: toastIn .3s var(--ease); max-width: 380px;
}
@keyframes toastIn { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: none; } }
.toast.out { animation: toastOut .3s var(--ease) forwards; }
@keyframes toastOut { to { opacity: 0; transform: translateX(40px); } }
.toast.success { background: linear-gradient(135deg, #17b57c, #0e9663); }
.toast.error { background: linear-gradient(135deg, #ff6b8f, #f43f68); }
.toast.loading { background: linear-gradient(135deg, #6a5cff, #9f7bff); }

/* ══════════════════ SKELETON & SCROLLBAR ══════════════════ */

.skeleton {
  border-radius: 11px;
  background: linear-gradient(100deg, #eceff8 40%, #f8fafe 50%, #eceff8 60%);
  background-size: 200% 100%; animation: shimmer 1.3s infinite;
}
@keyframes shimmer { to { background-position: -200% 0; } }
.skeleton-row { height: 62px; margin-bottom: 10px; }

::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cdd3e8; border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: #b2bad8; }

/* ══════════════════ RESPONSIVE & MOBILE DRAWER (3 GẠCH) ══════════════════ */

/* Desktop Collapsed Rail Mode */
@media (min-width: 1025px) {
  .app-shell.sidebar-collapsed {
    grid-template-columns: 0px 1fr;
  }
  .app-shell.sidebar-collapsed .sidebar {
    transform: translateX(-100%);
    opacity: 0;
    pointer-events: none;
  }
  .app-shell.sidebar-collapsed .topbar-brand {
    display: flex;
  }
}

/* Tablet & Mobile Off-canvas Drawer */
@media (max-width: 1024px) {
  .app-shell {
    display: block;
    min-height: 100vh;
  }
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 280px;
    max-width: 85vw;
    height: 100vh;
    z-index: 1000;
    transform: translateX(-100%);
    box-shadow: none;
    transition: transform 0.28s cubic-bezier(0.33, 1, 0.68, 1);
  }
  body.sidebar-open .sidebar {
    transform: translateX(0);
    box-shadow: 0 10px 40px rgba(15, 23, 42, 0.45);
  }
  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.55);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
  }
  body.sidebar-open .sidebar-backdrop {
    opacity: 1;
    pointer-events: auto;
  }
  .btn-sidebar-close {
    display: flex;
  }
  .topbar-brand {
    display: flex;
  }
  .main {
    padding: 16px 20px 40px;
  }
  .app-topbar {
    padding: 10px 16px;
    margin: -16px -20px 20px -20px;
  }
  .gen-layout {
    grid-template-columns: 1fr;
  }
  .gen-form-card {
    position: static;
  }
  .q-options {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 900px) {
  .stat-row[style*="repeat(4"] {
    grid-template-columns: repeat(2, 1fr) !important;
  }
  .dash-grid-2 {
    grid-template-columns: 1fr !important;
  }
  .exam-stats-strip {
    grid-template-columns: repeat(2, 1fr);
  }
  .form-row-2 {
    grid-template-columns: 1fr;
  }
  .tl-label {
    display: none;
  }
  .tl-lane-row {
    gap: 0;
  }
  .topic-detail-head {
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .stat-row[style*="repeat(4"] {
    grid-template-columns: 1fr !important;
  }
  .exam-stats-strip {
    grid-template-columns: 1fr;
  }
  .topbar-current-view {
    display: none;
  }
  .topbar-week-badge {
    display: none;
  }
  .topbar-db-badge {
    display: none;
  }
  .view-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
  .view-header h2 {
    font-size: 20px;
  }
  .header-actions {
    width: 100%;
    flex-wrap: wrap;
  }
  .modal-box {
    width: 94vw !important;
    padding: 18px !important;
    margin: 10px;
    max-height: 90vh;
  }
  .matrix-table-wrap, .exam-list-wrap, .scroll-table {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* ══════════════════ ĐỀ THI & KIỂM TRA ══════════════════ */

.exam-sec {
  border: 1.5px solid var(--line);
  border-radius: 14px;
  padding: 10px 12px;
  margin-bottom: 10px;
  background: #fbfcff;
}
.exam-sec-head {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.exam-sec-head .sec-title { font-weight: 800; font-size: 13.5px; flex: 1; }
.exam-q-row {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 9px; margin-top: 6px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 12.5px;
  animation: rowIn .3s var(--ease) both;
}
@keyframes rowIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.exam-q-row .no {
  min-width: 26px; height: 26px; border-radius: 8px;
  background: var(--primary-soft); color: var(--primary-deep);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 11.5px; flex-shrink: 0;
}
.exam-q-row .text {
  flex: 1; color: var(--ink-soft);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.exam-q-row .mini-btn {
  border: 1px solid var(--line); background: var(--surface);
  border-radius: 7px; width: 24px; height: 24px; cursor: pointer;
  font-size: 11px; color: var(--ink-soft); flex-shrink: 0; line-height: 1;
}
.exam-q-row .mini-btn:hover { border-color: var(--primary); color: var(--primary-deep); }
.exam-q-row .mini-btn.danger:hover { border-color: var(--pink); color: var(--pink); }
.exam-card-actions { display: flex; gap: 6px; margin-top: 10px; }
.picker-row { display: flex; align-items: flex-start; gap: 10px; padding: 9px 10px; border: 1px solid var(--line); border-radius: 10px; margin-bottom: 7px; background: var(--surface); }
.picker-row input[type=checkbox] { margin-top: 3px; width: 16px; height: 16px; accent-color: var(--primary); flex-shrink: 0; }
.picker-row .text { font-size: 12.5px; color: var(--ink); }
.picker-row.picked { border-color: var(--primary); background: var(--primary-soft); }
.topic-kind-stripe.stripe-exam { background: var(--grad-primary); }
.edit-correct-picker { display: flex; flex-direction: column; gap: 6px; }
.edit-correct-picker .corr-row {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 10px; border: 1.5px solid var(--line); border-radius: 10px;
  cursor: pointer; font-size: 12.5px; background: var(--surface);
  transition: border-color .15s var(--ease), background .15s var(--ease);
}
.edit-correct-picker .corr-row:hover { border-color: var(--primary); }
.edit-correct-picker .corr-row.correct { border-color: var(--green); background: #ecfaf3; color: var(--green); font-weight: 700; }

/* ══════════════════ LICENSE MANAGEMENT ══════════════════ */
.table-responsive { overflow-x: auto; width: 100%; margin-top: 10px; }
.data-table { width: 100%; border-collapse: collapse; text-align: left; font-size: 13px; }
.data-table th { background: #f8f9fe; padding: 12px 14px; font-weight: 700; color: var(--ink-soft); border-bottom: 2px solid var(--line); white-space: nowrap; }
.data-table td { padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.data-table tr:hover td { background: #fafbff; }

.lic-key-tag { font-family: monospace; font-size: 13.5px; font-weight: 700; background: var(--primary-soft); color: var(--primary-deep); padding: 4px 8px; border-radius: 8px; display: inline-flex; align-items: center; gap: 6px; }
.lic-copy-btn { border: none; background: transparent; cursor: pointer; font-size: 14px; color: var(--primary); padding: 2px; transition: transform .15s; }
.lic-copy-btn:hover { transform: scale(1.2); }

.lic-badge { display: inline-block; padding: 3px 8px; border-radius: 6px; font-size: 11.5px; font-weight: 700; }
.lic-badge.plan-1_month { background: #fff3e6; color: var(--orange); }
.lic-badge.plan-1_year { background: #eef2ff; color: var(--primary); }
.lic-badge.plan-3_year, .lic-badge.plan-lifetime { background: #fdf2f8; color: var(--pink); }

.lic-badge.status-active { background: #ecfaf3; color: var(--green); }
.lic-badge.status-expired { background: #fef2f2; color: #ef4444; }
.lic-badge.status-revoked { background: #f3f4f6; color: #6b7280; }

.device-chip { display: inline-flex; align-items: center; gap: 4px; background: #f1f3f9; padding: 2px 8px; border-radius: 12px; font-size: 11.5px; margin: 2px; }
.device-chip .remove-dev { border: none; background: transparent; cursor: pointer; color: #ef4444; font-weight: bold; margin-left: 3px; font-size: 12px; }
.device-chip .remove-dev:hover { color: #b91c1c; }

/* ══════════════════ MATH TOOLBAR & KATEX PREVIEW ══════════════════ */
.math-toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 10px;
  padding: 6px 10px;
  margin-bottom: 8px;
}
.math-toolbar-title {
  font-size: 12px;
  font-weight: 700;
  color: #475569;
  margin-right: 4px;
}
.math-btn {
  font-size: 11.5px;
  font-weight: 600;
  padding: 4px 8px;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  color: #1e293b;
  border-radius: 6px;
  cursor: pointer;
  transition: all .15s ease;
}
.math-btn:hover {
  background: #eff6ff;
  border-color: #3b82f6;
  color: #1d4ed8;
  transform: translateY(-1px);
}
.math-preview-box {
  background: #ffffff;
  border: 1.5px dashed #cbd5e1;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 14px;
  color: #1e293b;
  line-height: 1.6;
  max-height: 160px;
  overflow-y: auto;
}
.math-preview-box .katex {
  font-size: 1.15em;
}
.math-preview-item {
  padding: 6px 0;
  border-bottom: 1px solid #f1f5f9;
}
/* ══════════════════ DASHBOARD 360° COMMAND CENTER ══════════════════ */

.bento-kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 20px;
}
@media (max-width: 1200px) {
  .bento-kpi-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 640px) {
  .bento-kpi-grid {
    grid-template-columns: 1fr;
  }
}

.bento-card.bento-kpi {
  background: var(--paper, #ffffff);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 14px;
  padding: 16px 18px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.bento-card.bento-kpi[data-drill] {
  cursor: pointer;
}
.bento-card.bento-kpi[data-drill]:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0,0,0,0.08);
  border-color: var(--primary, #3b82f6);
}

.bento-kpi-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.grad-blue { background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%); color: #1e40af; }
.grad-amber { background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%); color: #b45309; }
.grad-cyan { background: linear-gradient(135deg, #cffafe 0%, #a5f3fc 100%); color: #0e7490; }
.grad-purple { background: linear-gradient(135deg, #f3e8ff 0%, #e9d5ff 100%); color: #7e22ce; }

.bento-kpi-body {
  flex: 1;
  min-width: 0;
}
.bento-kpi-val {
  font-size: 22px;
  font-weight: 800;
  color: var(--ink, #0f172a);
  line-height: 1.1;
  font-feature-settings: "tnum";
}
.bento-kpi-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-soft, #64748b);
  margin-top: 3px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.kpi-arrow {
  display: inline-block;
  opacity: 0;
  transform: translateX(-4px);
  transition: all 0.18s ease;
  font-size: 11px;
  color: var(--primary, #3b82f6);
}
.bento-card.bento-kpi[data-drill]:hover .kpi-arrow {
  opacity: 1;
  transform: translateX(2px);
}
.bento-kpi-sub {
  font-size: 11.5px;
  color: var(--ink-faint, #94a3b8);
  margin-top: 5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.badge-dot-green {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  margin-right: 3px;
}

/* ── Ma trận Nhiệt Kho Nội dung ── */
.matrix-card {
  margin-bottom: 20px;
}
.matrix-legend {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 12px;
  color: var(--ink-soft, #64748b);
}
.m-legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
}
.m-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}
.m-dot-good { background: #10b981; }
.m-dot-mid { background: #f59e0b; }
.m-dot-low { background: #ef4444; }

.matrix-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 13.5px;
}
.matrix-table th {
  background: var(--bg-soft, #f8fafc);
  padding: 10px 14px;
  font-weight: 700;
  color: var(--ink, #1e293b);
  border-bottom: 1.5px solid var(--border, #e2e8f0);
}
.matrix-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border, #e2e8f0);
  vertical-align: middle;
}
.matrix-table tr:hover td {
  background: rgba(241, 245, 249, 0.5);
}

.matrix-cell-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 7px 11px;
  border-radius: 9px;
  border: 1px solid transparent;
  background: #ffffff;
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: left;
}
.matrix-cell-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 3px 8px rgba(0,0,0,0.06);
}
.m-state-good {
  background: #f0fdf4;
  border-color: #bbf7d0;
  color: #166534;
}
.m-state-good:hover { border-color: #4ade80; }
.m-state-mid {
  background: #fefce8;
  border-color: #fef08a;
  color: #854d0e;
}
.m-state-mid:hover { border-color: #facc15; }
.m-state-low {
  background: #fef2f2;
  border-color: #fecaca;
  color: #991b1b;
}
.m-state-low:hover { border-color: #f87171; }

.m-cell-num {
  font-size: 14px;
  font-weight: 800;
  font-feature-settings: "tnum";
}
.m-cell-meta {
  font-size: 11px;
  opacity: 0.85;
}

/* ── 2 Cột Vận hành & Radar Cảnh báo ── */
.dash-two-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
@media (max-width: 960px) {
  .dash-two-cols {
    grid-template-columns: 1fr;
  }
}

.ops-section {
  padding: 4px 0;
}
.ops-sec-title {
  font-size: 12.5px;
  font-weight: 700;
  color: var(--ink-soft, #64748b);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

.ops-bar-multi {
  height: 12px;
  border-radius: 99px;
  background: #e2e8f0;
  display: flex;
  overflow: hidden;
}
.bar-seg {
  height: 100%;
  transition: width 0.3s ease;
}
.bar-active { background: #10b981; }
.bar-unused { background: #3b82f6; }
.bar-trial { background: #ec4899; }
.bar-expired { background: #94a3b8; }

.ops-legend-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 10px;
  font-size: 12px;
}
.ops-legend-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.pill-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.pill-stat {
  background: var(--bg-soft, #f8fafc);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 10px;
  padding: 8px 12px;
  text-align: center;
}
.pill-stat-val {
  font-size: 16px;
  font-weight: 800;
  color: var(--ink, #0f172a);
}
.pill-stat-lbl {
  font-size: 11.5px;
  color: var(--ink-soft, #64748b);
  margin-top: 2px;
}

.device-dist-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}
.device-dist-card {
  background: var(--bg-soft, #f8fafc);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 9px;
  padding: 8px 10px;
  text-align: center;
}

/* ── Radar Tabs & Content ── */
.radar-tabs {
  display: flex;
  border-bottom: 1px solid var(--border, #e2e8f0);
  margin-bottom: 12px;
  gap: 6px;
}
.radar-tab {
  background: none;
  border: none;
  padding: 7px 12px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-soft, #64748b);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.15s ease;
}
.radar-tab.active {
  color: var(--primary, #3b82f6);
  border-bottom-color: var(--primary, #3b82f6);
}

.radar-content-box {
  max-height: 260px;
  overflow-y: auto;
}
.radar-alert-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 12px;
  border-radius: 8px;
  background: var(--bg-soft, #f8fafc);
  border: 1px solid var(--border, #e2e8f0);
  margin-bottom: 8px;
  font-size: 13px;
  transition: background 0.15s ease;
}
.radar-alert-item:hover {
  background: #f1f5f9;
}
.radar-alert-action {
  font-size: 11.5px;
  padding: 4px 8px;
}

/* ── Sidebar User & Auth ── */
.sidebar-user {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  padding: 10px 12px;
  margin-top: 12px;
}
.sidebar-user .user-info {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}
.sidebar-user .user-avatar {
  font-size: 18px;
}
.sidebar-user .user-details {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.sidebar-user .user-name {
  font-size: 12.5px;
  font-weight: 700;
  color: #fff;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sidebar-user .user-role {
  font-size: 10px;
  font-weight: 600;
  color: #a5b4fc;
  letter-spacing: 0.3px;
}
.sidebar-user .btn-logout {
  background: rgba(239, 68, 68, 0.2);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
  border-radius: 8px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
  font-size: 13px;
  flex-shrink: 0;
}
.sidebar-user .btn-logout:hover {
  background: rgba(239, 68, 68, 0.4);
  color: #fff;
}

/* ── AI Draft Preview Actions ── */
.ai-actions-bar {
  display: flex;
  gap: 10px;
  align-items: center;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  padding: 12px 16px;
  border-radius: 12px;
  margin-bottom: 16px;
}
.ai-actions-bar .ai-badge {
  background: #22c55e;
  color: #fff;
  font-weight: 700;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 6px;
}