/* ==========================================================================
   Bladevel — Bộ công cụ trợ lý Giáo viên (Teacher Workspace)
   THEME: "Phoenix" — chuyển toàn bộ ngôn ngữ thị giác sang theme Phoenix
   (bảng màu, thang xám, bo góc, đổ bóng, typography Nunito Sans, cách dựng
   card/bảng/badge/nút) theo đúng 2 tệp tham chiếu đã cung cấp.
   Toàn bộ tên class GIỮ NGUYÊN tiền tố "tw-" như bản gốc — không đổi 1 class
   nào — để không đụng tới HTML của 5 trang công cụ lẫn phần JS xử lý trạng
   thái (vòng quay, quiz, slide, xác nhận). Chỉ "thay da", không "thay khung".
   ========================================================================== */

.tw-shell {
  /* ---- Thang xám Phoenix (Gray 50 -> 1100) ---- */
  --tw-gray-50:  #f5f7fa;
  --tw-gray-100: #eff2f6;
  --tw-gray-200: #e3e6ed;
  --tw-gray-300: #cbd0dd;
  --tw-gray-400: #9fa6bc;
  --tw-gray-500: #8a94ad;
  --tw-gray-600: #6e7891;
  --tw-gray-700: #525b75;
  --tw-gray-800: #3e465b;
  --tw-gray-900: #31374a;
  --tw-gray-1000: #222834;
  --tw-gray-1100: #141824;

  /* ---- Bảng màu ngữ nghĩa Phoenix ---- */
  --tw-bg: var(--tw-gray-100);
  --tw-surface: #ffffff;
  --tw-surface-alt: var(--tw-gray-50);
  --tw-border: var(--tw-gray-200);
  --tw-border-soft: var(--tw-gray-100);
  --tw-text: var(--tw-gray-1100);
  --tw-text-muted: var(--tw-gray-700);
  --tw-text-soft: var(--tw-gray-500);

  --tw-primary: #3874ff;
  --tw-primary-light: #85a9ff;
  --tw-primary-dark: #004dff;
  --tw-primary-darker: #003cc7;
  --tw-primary-soft: #e8effe;

  --tw-success: #25b003;
  --tw-success-dark: #1c6c09;
  --tw-success-soft: #e5f6e0;

  --tw-warning: #e5780b;
  --tw-warning-dark: #bc3803;
  --tw-warning-soft: #fdf0df;

  --tw-danger: #fa3b1d;
  --tw-danger-dark: #b81800;
  --tw-danger-soft: #feeae7;

  --tw-info: #0097eb;
  --tw-info-dark: #005585;
  --tw-info-soft: #e2f4fd;

  --tw-purple: #6f42c1;
  --tw-purple-soft: #ede4f9;

  /* ---- Bo góc & đổ bóng theo phong cách Phoenix (phẳng, tinh giản) ---- */
  --tw-radius-lg: 0.75rem;
  --tw-radius: 0.5rem;
  --tw-radius-sm: 0.375rem;
  --tw-radius-pill: 50rem;
  --tw-shadow-sm: 0 1px 2px rgba(20, 24, 36, 0.06);
  --tw-shadow: 0 0.75rem 2rem -0.75rem rgba(20, 24, 36, 0.22);
  --tw-focus-ring: 0 0 0 0.2rem rgba(56, 116, 255, 0.18);

  /* ---- Typography Nunito Sans (đúng font theme Phoenix) ---- */
  --tw-font: "Nunito Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --tw-sidebar-w: 227px;
  --tw-sidebar-w-collapsed: 62px;

  all: initial;
  display: block;
  font-family: var(--tw-font);
  background: var(--tw-bg);
  color: var(--tw-text);
  font-size: 13px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
.tw-shell *, .tw-shell *::before, .tw-shell *::after { box-sizing: border-box; }
.tw-shell { display: block; min-height: 100vh; position: relative; }
.tw-shell a { color: inherit; text-decoration: none; font-family: var(--tw-font); }
.tw-shell ul, .tw-shell ol { margin: 0; padding: 0; list-style: none; }
.tw-shell h1, .tw-shell h2, .tw-shell h3, .tw-shell h4, .tw-shell p { margin: 0; font-family: var(--tw-font); }
.tw-shell button, .tw-shell input, .tw-shell select, .tw-shell textarea { font-family: var(--tw-font); font-size: 12.5px; color: var(--tw-text); }
.tw-shell svg { display: block; }
.tw-shell strong, .tw-shell b { font-weight: 800; }

.tw-container { max-width: 1091px; margin: 0 auto; padding: 0 23px; width: 100%; }
.tw-container-fluid { max-width: none; margin: 0; padding: 0 26px; width: 100%; }
@media (max-width: 620px) { .tw-container-fluid { padding: 0 16px; } }

/* ---------- App shell: sidebar dọc + khu nội dung (navigation-type=vertical, giống Phoenix) ---------- */
.tw-app { display: flex; align-items: stretch; min-height: 100vh; width: 100%; }

.tw-sidebar {
  width: var(--tw-sidebar-w); flex-shrink: 0; background: var(--tw-surface); border-right: 1px solid var(--tw-border);
  position: sticky; top: 0; align-self: flex-start; height: 100vh; overflow-y: auto; overflow-x: hidden;
  display: flex; flex-direction: column; z-index: 41;
  transition: width .18s ease;
}
.tw-sidebar-brand { padding: 19.5px 17.5px 9px; flex-shrink: 0; display: flex; align-items: center; justify-content: space-between; gap: 6px; }
.tw-brand { display: flex; align-items: center; gap: 9px; font-weight: 800; font-size: 14px; color: var(--tw-text); letter-spacing: -.2px; overflow: hidden; white-space: nowrap; }
.tw-brand b { color: var(--tw-primary); font-weight: 900; }
.tw-brand-mark {
  width: 30px; height: 30px; border-radius: var(--tw-radius); background: var(--tw-primary-soft);
  color: var(--tw-primary); display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  overflow: hidden;
}
.tw-brand-mark svg, .tw-brand-mark img { width: 30px; height: 30px; display: block; }

/* Nút đóng/mở sidebar */
.tw-sidebar-toggle {
  flex-shrink: 0; width: 26px; height: 26px; border-radius: var(--tw-radius-sm); border: 1px solid var(--tw-border);
  background: var(--tw-surface-alt); color: var(--tw-text-muted); display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: color .15s ease, background-color .15s ease, border-color .15s ease;
}
.tw-sidebar-toggle svg { width: 14px; height: 14px; transition: transform .18s ease; }
.tw-sidebar-toggle:hover { color: var(--tw-primary); background: var(--tw-primary-soft); border-color: var(--tw-primary-light); }

.tw-sidebar-label { padding: 14px 12.5px 5.5px; font-size: 9px; font-weight: 800; color: var(--tw-text-soft); text-transform: uppercase; letter-spacing: .07em; flex-shrink: 0; white-space: nowrap; overflow: hidden; }

.tw-sidebar-nav { flex: 1; padding: 2px 12.5px 12.5px; display: flex; flex-direction: column; gap: 2px; }
.tw-tool-tab {
  display: flex; align-items: center; gap: 9.5px; padding: 9px 10.5px; font-size: 12px;
  font-weight: 700; color: var(--tw-text-muted); border-radius: var(--tw-radius);
  transition: color .15s ease, background-color .15s ease;
  white-space: nowrap; overflow: hidden;
}
.tw-tool-tab span { overflow: hidden; text-overflow: ellipsis; }
.tw-tool-tab svg { width: 16px; height: 16px; flex-shrink: 0; }
.tw-tool-tab:hover { color: var(--tw-text); background: var(--tw-surface-alt); }
.tw-tool-tab-active { color: var(--tw-primary); background: var(--tw-primary-soft); }
.tw-tool-tab-active:hover { color: var(--tw-primary); background: var(--tw-primary-soft); }

.tw-sidebar-foot { padding: 10.5px 17.5px; border-top: 1px solid var(--tw-border); flex-shrink: 0; }
.tw-back-link { display: flex; align-items: center; gap: 7px; font-size: 11px; color: var(--tw-text-muted); font-weight: 700; padding: 7px 9px; border-radius: var(--tw-radius); white-space: nowrap; overflow: hidden; }
.tw-back-link svg { width: 13px; height: 13px; flex-shrink: 0; }
.tw-back-link:hover { color: var(--tw-primary); background: var(--tw-primary-soft); }

/* ---------- Trạng thái sidebar thu gọn (chỉ hiện icon) ---------- */
html.tw-sidebar-collapsed .tw-sidebar { width: var(--tw-sidebar-w-collapsed); }
html.tw-sidebar-collapsed .tw-sidebar-brand { padding-left: 11px; padding-right: 11px; }
html.tw-sidebar-collapsed .tw-brand span,
html.tw-sidebar-collapsed .tw-sidebar-label,
html.tw-sidebar-collapsed .tw-tool-tab span,
html.tw-sidebar-collapsed .tw-back-link span { display: none; }
html.tw-sidebar-collapsed .tw-brand { gap: 0; }
html.tw-sidebar-collapsed .tw-sidebar-nav { padding-left: 9px; padding-right: 9px; }
html.tw-sidebar-collapsed .tw-tool-tab,
html.tw-sidebar-collapsed .tw-back-link { justify-content: center; padding-left: 8px; padding-right: 8px; }
html.tw-sidebar-collapsed .tw-sidebar-foot { padding-left: 11px; padding-right: 11px; }
html.tw-sidebar-collapsed .tw-sidebar-toggle svg { transform: rotate(180deg); }
@media (max-width: 900px) {
  html.tw-sidebar-collapsed .tw-sidebar { width: 100%; }
  html.tw-sidebar-collapsed .tw-brand span,
  html.tw-sidebar-collapsed .tw-tool-tab span,
  html.tw-sidebar-collapsed .tw-back-link span { display: inline; }
  html.tw-sidebar-collapsed .tw-sidebar-label { display: block; }
}

/* ---------- Khu nội dung bên phải sidebar / footer ---------- */
.tw-content { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.tw-main { flex: 1; padding: 26.5px 0 53px; }
.tw-footer {
  padding: 16px 19.5px; text-align: center; color: var(--tw-text-soft); font-size: 10.5px; font-weight: 600;
  border-top: 1px solid var(--tw-border); background: var(--tw-surface);
}

/* ---------- Page header ---------- */
.tw-page-head { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 21px; }
.tw-page-icon {
  width: 44px; height: 44px; border-radius: var(--tw-radius); background: var(--tw-primary-soft);
  color: var(--tw-primary); display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  box-shadow: inset 0 0 0 1px rgba(56, 116, 255, 0.12);
}
.tw-page-icon svg { width: 22px; height: 22px; }
.tw-page-title { font-size: 19.5px; font-weight: 800; letter-spacing: -.3px; margin-bottom: 3.5px; color: var(--tw-gray-1100); }
.tw-page-desc { color: var(--tw-text-muted); font-size: 12px; max-width: 563px; }

/* ---------- Grid / panels ---------- */
.tw-grid { display: grid; grid-template-columns: 352px 1fr; gap: 17.5px; align-items: start; }
.tw-grid-wide { display: grid; grid-template-columns: 1fr; gap: 17.5px; }
/* Bố cục riêng cho trang Soạn giáo án khi dùng container full-width: cột trái
   co giãn trong khoảng an toàn, cột phải chiếm hết phần còn lại tới sát mép. */
.tw-lp-layout, .tw-ex-layout { grid-template-columns: minmax(300px, 380px) 1fr; }
@media (min-width: 1500px) { .tw-lp-layout, .tw-ex-layout { grid-template-columns: minmax(320px, 420px) 1fr; } }
.tw-panel {
  background: var(--tw-surface); border: 1px solid var(--tw-border); border-radius: var(--tw-radius-lg);
  box-shadow: var(--tw-shadow-sm); overflow: hidden;
}
.tw-panel-head { padding: 14px 17.5px; border-bottom: 1px solid var(--tw-border); display: flex; align-items: center; justify-content: space-between; gap: 9px; }
.tw-panel-title { font-size: 13px; font-weight: 800; color: var(--tw-gray-1100); }
.tw-panel-sub { font-size: 10.5px; color: var(--tw-text-soft); margin-top: 2px; font-weight: 600; }
.tw-panel-body { padding: 17.5px; }
.tw-panel-body-flush { padding: 0; }
.tw-panel-foot { padding: 12.5px 17.5px; border-top: 1px solid var(--tw-border); background: var(--tw-surface-alt); }

/* ---------- Forms ---------- */
.tw-field { margin-bottom: 14px; }
.tw-field:last-child { margin-bottom: 0; }
.tw-row { display: grid; gap: 10.5px; }
.tw-row-2 { grid-template-columns: 1fr 1fr; }
.tw-row-3 { grid-template-columns: 1fr 1fr 1fr; }
.tw-label { display: block; font-size: 11px; font-weight: 800; color: var(--tw-gray-900); margin-bottom: 5.5px; text-transform: uppercase; letter-spacing: .02em; }
.tw-label .tw-optional { font-weight: 500; color: var(--tw-text-soft); text-transform: none; letter-spacing: 0; }
.tw-input, .tw-select, .tw-textarea {
  width: 100%; background: var(--tw-surface-alt); border: 1px solid var(--tw-border);
  border-radius: var(--tw-radius-sm); padding: 8px 11.5px; color: var(--tw-text); outline: none; font-size: 12px;
  transition: border-color .15s ease, background .15s ease, box-shadow .15s ease;
}
.tw-textarea { resize: vertical; min-height: 68.5px; line-height: 1.5; }
.tw-input:focus, .tw-select:focus, .tw-textarea:focus { border-color: var(--tw-primary); background: var(--tw-surface); box-shadow: var(--tw-focus-ring); }
.tw-select { appearance: none; -webkit-appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236e7891' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 10.5px center; background-size: 14px; padding-right: 31.5px; }
.tw-hint { font-size: 10px; color: var(--tw-text-soft); margin-top: 4.5px; font-weight: 600; }
.tw-error-text { font-size: 10.5px; color: var(--tw-danger-dark); margin-top: 4.5px; font-weight: 700; }
.tw-input.tw-invalid, .tw-select.tw-invalid, .tw-textarea.tw-invalid { border-color: var(--tw-danger); background: var(--tw-danger-soft); }

.tw-chip-group { display: flex; flex-wrap: wrap; gap: 7px; }
.tw-chip { position: relative; }
.tw-chip input { position: absolute; opacity: 0; inset: 0; cursor: pointer; margin: 0; }
.tw-chip-label {
  display: inline-flex; align-items: center; gap: 5.5px; padding: 6px 12.5px; border-radius: var(--tw-radius-pill);
  border: 1px solid var(--tw-border); font-size: 11px; font-weight: 700; color: var(--tw-text-muted);
  background: var(--tw-surface-alt); cursor: pointer; transition: all .15s ease; user-select: none;
}
.tw-chip input:checked + .tw-chip-label { background: var(--tw-primary); border-color: var(--tw-primary); color: #fff; }
.tw-chip input:focus-visible + .tw-chip-label { outline: 2px solid var(--tw-primary); outline-offset: 2px; }

/* Bẫy honeypot dùng chung với các trang khác của Bladevel */
.tw-shell .bv-hp { position: absolute; left: -8799px; top: -8799px; height: 0; width: 0; overflow: hidden; }

/* ---------- Buttons (kiểu btn-phoenix-*) ---------- */
.tw-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 16px; border-radius: var(--tw-radius-sm); font-weight: 700; font-size: 11.5px;
  border: 1px solid transparent; cursor: pointer; transition: transform .1s ease, opacity .12s ease, background .15s ease, border-color .15s ease, box-shadow .15s ease;
  line-height: 1.2;
}
.tw-btn svg { width: 14px; height: 14px; flex-shrink: 0; }
.tw-btn:active { transform: translateY(1px); }
.tw-btn-primary { background: var(--tw-primary); color: #fff; box-shadow: 0 2px 5.5px -2px rgba(56, 116, 255, .55); }
.tw-btn-primary:hover { background: var(--tw-primary-dark); }
.tw-btn-outline { background: var(--tw-surface); border-color: var(--tw-border); color: var(--tw-gray-900); }
.tw-btn-outline:hover { border-color: var(--tw-primary); color: var(--tw-primary); background: var(--tw-primary-soft); }
.tw-btn-ghost { background: transparent; color: var(--tw-text-muted); }
.tw-btn-ghost:hover { background: var(--tw-surface-alt); color: var(--tw-text); }
.tw-btn-danger { background: var(--tw-danger-soft); color: var(--tw-danger-dark); }
.tw-btn-danger:hover { background: var(--tw-danger); color: #fff; }
.tw-btn-sm { padding: 5.5px 10.5px; font-size: 10.5px; }
.tw-btn-block { width: 100%; }
.tw-btn-icon { padding: 7px; border-radius: var(--tw-radius-sm); }
.tw-btn[disabled] { opacity: .55; cursor: not-allowed; box-shadow: none; }

/* ---------- Badges (kiểu badge-phoenix-*) ---------- */
.tw-badge { display: inline-flex; align-items: center; gap: 4.5px; padding: 3px 9px; border-radius: var(--tw-radius-pill); font-size: 9.5px; font-weight: 800; letter-spacing: .01em; }
.tw-badge-primary { background: var(--tw-primary-soft); color: var(--tw-primary-darker); }
.tw-badge-success { background: var(--tw-success-soft); color: var(--tw-success-dark); }
.tw-badge-warning { background: var(--tw-warning-soft); color: var(--tw-warning-dark); }
.tw-badge-danger { background: var(--tw-danger-soft); color: var(--tw-danger-dark); }
.tw-badge-info { background: var(--tw-info-soft); color: var(--tw-info-dark); }
.tw-badge-purple { background: var(--tw-purple-soft); color: var(--tw-purple); }
.tw-badge-neutral { background: var(--tw-surface-alt); color: var(--tw-text-muted); border: 1px solid var(--tw-border); }

/* ---------- Empty state ---------- */
.tw-empty { text-align: center; padding: 38.5px 21px; color: var(--tw-text-soft); }
.tw-empty-icon { width: 47.5px; height: 47.5px; margin: 0 auto 12.5px; color: var(--tw-border); }
.tw-empty-icon svg { width: 100%; height: 100%; }
.tw-empty-title { font-size: 12.5px; font-weight: 800; color: var(--tw-text-muted); margin-bottom: 3.5px; }
.tw-empty-text { font-size: 11px; max-width: 281.5px; margin: 0 auto; }

/* ---------- History list ---------- */
.tw-history { display: flex; flex-direction: column; }
.tw-history-item {
  display: flex; align-items: center; gap: 10.5px; padding: 11.5px 17.5px; border-bottom: 1px solid var(--tw-border-soft);
  transition: background .12s ease; cursor: pointer;
}
.tw-history-item:last-child { border-bottom: none; }
.tw-history-item:hover { background: var(--tw-surface-alt); }
.tw-history-item-active { background: var(--tw-primary-soft); }
.tw-history-avatar {
  width: 31.5px; height: 31.5px; border-radius: var(--tw-radius-pill); background: var(--tw-surface-alt); color: var(--tw-text-muted);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0; font-weight: 800; font-size: 11px;
  border: 1px solid var(--tw-border);
}
.tw-history-item-active .tw-history-avatar { background: var(--tw-primary); color: #fff; border-color: var(--tw-primary); }
.tw-history-body { flex: 1; min-width: 0; }
.tw-history-title { font-size: 11.5px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tw-history-sub { font-size: 10px; color: var(--tw-text-soft); margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-weight: 600; }
.tw-history-del {
  flex-shrink: 0; width: 24.5px; height: 24.5px; border-radius: var(--tw-radius-sm); display: flex; align-items: center;
  justify-content: center; color: var(--tw-text-soft); background: transparent; border: none; cursor: pointer;
}
.tw-history-del svg { width: 13px; height: 13px; }
.tw-history-del:hover { background: var(--tw-danger-soft); color: var(--tw-danger); }

/* ---------- Alert ---------- */
.tw-alert { display: flex; gap: 10.5px; padding: 11.5px 14px; border-radius: var(--tw-radius); font-size: 11.5px; font-weight: 600; margin-bottom: 16px; }
.tw-alert svg { width: 16px; height: 16px; flex-shrink: 0; margin-top: 1px; }
.tw-alert-success { background: var(--tw-success-soft); color: var(--tw-success-dark); }
.tw-alert-danger { background: var(--tw-danger-soft); color: var(--tw-danger-dark); }
.tw-alert-info { background: var(--tw-info-soft); color: var(--tw-info-dark); }

/* ---------- Stat cards ---------- */
.tw-stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10.5px; margin-bottom: 17.5px; }
.tw-stat-card { display: flex; align-items: center; gap: 10.5px; background: var(--tw-surface); border: 1px solid var(--tw-border); border-radius: var(--tw-radius); padding: 12.5px 14px; }
.tw-stat-num { font-size: 16.5px; font-weight: 800; color: var(--tw-gray-1100); line-height: 1.2; }
.tw-stat-label { font-size: 9.5px; color: var(--tw-text-soft); margin-top: 1px; font-weight: 700; }
.tw-stat-icon {
  width: 33.5px; height: 33.5px; border-radius: var(--tw-radius-pill); flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
}
.tw-stat-icon svg { width: 16px; height: 16px; }
.tw-stat-icon-primary { background: var(--tw-primary-soft); color: var(--tw-primary); }
.tw-stat-icon-success { background: var(--tw-success-soft); color: var(--tw-success-dark); }
.tw-stat-icon-warning { background: var(--tw-warning-soft); color: var(--tw-warning-dark); }
.tw-stat-icon-danger { background: var(--tw-danger-soft); color: var(--tw-danger-dark); }
.tw-stat-icon-purple { background: var(--tw-purple-soft); color: var(--tw-purple); }

/* ==========================================================================
   Soạn giáo án
   ========================================================================== */
.tw-lp-section { margin-bottom: 19.5px; }
.tw-lp-section:last-child { margin-bottom: 0; }
.tw-lp-section-title { display: flex; align-items: center; gap: 7px; font-size: 12px; font-weight: 800; margin-bottom: 9px; color: var(--tw-primary-darker); }
.tw-lp-section-title .tw-num { width: 18.5px; height: 18.5px; border-radius: var(--tw-radius-sm); background: var(--tw-primary); color: #fff; font-size: 10px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.tw-lp-goal-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10.5px; }
.tw-lp-goal-box { background: var(--tw-surface-alt); border: 1px solid var(--tw-border); border-radius: var(--tw-radius-sm); padding: 11.5px 12.5px; }
.tw-lp-goal-box h4 { font-size: 10px; font-weight: 800; margin-bottom: 7px; color: var(--tw-text-muted); text-transform: uppercase; letter-spacing: .03em; }
.tw-lp-goal-box ul { display: flex; flex-direction: column; gap: 5.5px; }
.tw-lp-goal-box li { font-size: 11px; padding-left: 12.5px; position: relative; }
.tw-lp-goal-box li::before { content: ""; position: absolute; left: 0; top: 6px; width: 4.5px; height: 4.5px; border-radius: 50%; background: var(--tw-primary); }
.tw-lp-prep-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10.5px; }
.tw-lp-activity { border: 1px solid var(--tw-border); border-radius: var(--tw-radius); margin-bottom: 10.5px; overflow: hidden; }
.tw-lp-activity:last-child { margin-bottom: 0; }
.tw-lp-activity-head { display: flex; align-items: center; justify-content: space-between; gap: 9px; padding: 9.5px 14px; background: var(--tw-surface-alt); }
.tw-lp-activity-name { font-size: 11.5px; font-weight: 700; }
.tw-lp-activity-right { display: flex; align-items: center; gap: 7px; flex-shrink: 0; }
.tw-lp-activity-time { font-size: 9.5px; font-weight: 800; color: var(--tw-primary-darker); background: var(--tw-primary-soft); padding: 3px 8px; border-radius: var(--tw-radius-pill); white-space: nowrap; }
.tw-lp-activity-toggle {
  width: 22px; height: 22px; border-radius: var(--tw-radius-sm); border: none; background: transparent;
  color: var(--tw-text-soft); display: flex; align-items: center; justify-content: center; cursor: pointer; flex-shrink: 0;
}
.tw-lp-activity-toggle svg { width: 13px; height: 13px; transition: transform .18s ease; }
.tw-lp-activity-toggle:hover { background: var(--tw-surface); color: var(--tw-primary); }
.tw-lp-activity-body { padding: 11.5px 14px; display: flex; flex-direction: column; gap: 7px; }
.tw-lp-activity-collapsed .tw-lp-activity-body { display: none; }
.tw-lp-activity-collapsed .tw-lp-activity-toggle svg { transform: rotate(-90deg); }
.tw-lp-activity-row { display: grid; grid-template-columns: 79px 1fr; gap: 9px; font-size: 11px; }
.tw-lp-activity-row b { color: var(--tw-text-muted); font-weight: 800; font-size: 10px; text-transform: uppercase; letter-spacing: .02em; }
.tw-lp-timebar { display: flex; height: 6px; border-radius: var(--tw-radius-pill); overflow: hidden; margin-bottom: 8px; background: var(--tw-surface-alt); }
.tw-lp-timebar-seg { height: 100%; }
.tw-lp-legend { display: flex; flex-wrap: wrap; gap: 5px 14px; margin-bottom: 15px; }
.tw-lp-legend-item { display: inline-flex; align-items: center; gap: 6px; font-size: 10.5px; font-weight: 700; color: var(--tw-text-muted); }
.tw-lp-legend-item i { width: 8px; height: 8px; border-radius: 2px; display: inline-block; flex-shrink: 0; }

/* Thanh tìm kiếm giáo án đã lưu */
.tw-search-wrap { position: relative; padding: 0 14px 11px; }
.tw-search-wrap svg { position: absolute; left: 26px; top: 50%; transform: translateY(-50%); width: 13px; height: 13px; color: var(--tw-text-soft); pointer-events: none; }
.tw-search-wrap .tw-input { padding-left: 30px; }
.tw-history-noresult { display: none; padding: 26px 18px; text-align: center; color: var(--tw-text-soft); font-size: 11.5px; font-weight: 600; }

/* ==========================================================================
   Ra đề kiểm tra
   ========================================================================== */
.tw-exam-summary { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 17.5px; }
.tw-exam-matrix { width: 100%; border-collapse: collapse; margin-bottom: 17.5px; font-size: 11px; }
.tw-exam-matrix th, .tw-exam-matrix td { border: 1px solid var(--tw-border); padding: 8px 10.5px; text-align: center; }
.tw-exam-matrix th { background: var(--tw-surface-alt); font-weight: 800; color: var(--tw-text-muted); font-size: 9.5px; text-transform: uppercase; letter-spacing: .03em; }
.tw-exam-matrix td:first-child, .tw-exam-matrix th:first-child { text-align: left; }
.tw-q-group-label { font-size: 11px; font-weight: 800; color: var(--tw-text-muted); text-transform: uppercase; letter-spacing: .03em; margin: 17.5px 0 9px; }
.tw-q-group-label:first-child { margin-top: 0; }
.tw-question-card { border: 1px solid var(--tw-border); border-radius: var(--tw-radius); padding: 13px 15px; margin-bottom: 10.5px; }
.tw-question-head { display: flex; justify-content: space-between; gap: 9px; margin-bottom: 9px; }
.tw-question-text { font-size: 11.5px; font-weight: 700; flex: 1; }
.tw-question-num { color: var(--tw-primary-darker); font-weight: 800; margin-right: 3.5px; }
.tw-option-list { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
.tw-option { display: flex; align-items: center; gap: 8px; font-size: 11px; padding: 6px 9px; border-radius: var(--tw-radius-sm); background: var(--tw-surface-alt); }
.tw-option-letter { width: 17.5px; height: 17.5px; border-radius: 5.5px; background: var(--tw-surface); border: 1px solid var(--tw-border); display: flex; align-items: center; justify-content: center; font-size: 9px; font-weight: 800; color: var(--tw-text-muted); flex-shrink: 0; }
.tw-option-correct { background: var(--tw-success-soft); }
.tw-option-correct .tw-option-letter { background: var(--tw-success); border-color: var(--tw-success); color: #fff; }
/* Chế độ "Ẩn đáp án" — dùng khi in/xuất bản đề cho học sinh, không lộ ô đúng */
.tw-hide-answers .tw-option-correct { background: var(--tw-surface-alt) !important; }
.tw-hide-answers .tw-option-correct .tw-option-letter { background: var(--tw-surface) !important; border-color: var(--tw-border) !important; color: var(--tw-text-muted) !important; }
.tw-essay-item { font-size: 11.5px; padding: 9px 0; border-bottom: 1px dashed var(--tw-border); }
.tw-essay-item:last-child { border-bottom: none; }

/* ==========================================================================
   Chấm bài & nhận xét
   ========================================================================== */
.tw-student-table-wrap { border: 1px solid var(--tw-border); border-radius: var(--tw-radius); overflow: hidden; }
.tw-student-table { width: 100%; border-collapse: collapse; }
.tw-student-table th { background: var(--tw-surface-alt); text-align: left; font-size: 9.5px; font-weight: 800; color: var(--tw-text-muted); text-transform: uppercase; letter-spacing: .03em; padding: 9px 12.5px; }
.tw-student-table td { padding: 8px 12.5px; border-top: 1px solid var(--tw-border-soft); font-size: 11.5px; vertical-align: middle; }
.tw-student-table input.tw-input { padding: 6px 9px; }
.tw-student-row-remove { width: 26.5px; height: 26.5px; border-radius: var(--tw-radius-sm); border: none; background: transparent; color: var(--tw-text-soft); cursor: pointer; display: inline-flex; align-items: center; justify-content: center; }
.tw-student-row-remove:hover { background: var(--tw-danger-soft); color: var(--tw-danger); }
.tw-student-row-remove svg { width: 13px; height: 13px; }
.tw-classify-badge { padding: 3px 9px; border-radius: var(--tw-radius-pill); font-size: 9.5px; font-weight: 800; white-space: nowrap; }
.tw-result-row { border-bottom: 1px solid var(--tw-border-soft); padding: 12.5px 0; }
.tw-result-row:last-child { border-bottom: none; }
.tw-result-top { display: flex; align-items: center; justify-content: space-between; gap: 9px; margin-bottom: 5.5px; }
.tw-result-name { font-weight: 700; font-size: 11.5px; }
.tw-result-score { font-weight: 800; font-size: 12px; color: var(--tw-primary-darker); }
.tw-result-comment { font-size: 11px; color: var(--tw-text-muted); line-height: 1.5; }

/* ==========================================================================
   Tạo slide bài giảng
   ========================================================================== */
.tw-slide-stage { padding: 19.5px; background: var(--tw-surface-alt); }
.tw-slide-canvas-wrap { position: relative; width: 100%; max-width: 669px; margin: 0 auto; aspect-ratio: 16 / 9; border-radius: var(--tw-radius); overflow: hidden; box-shadow: var(--tw-shadow); background: #fff; border: 1px solid var(--tw-border); }
.tw-slide-canvas-wrap svg { width: 100%; height: 100%; display: block; }
.tw-slide-controls { display: flex; align-items: center; justify-content: center; gap: 12.5px; margin-top: 14px; }
.tw-slide-counter { font-size: 10.5px; font-weight: 800; color: var(--tw-text-muted); min-width: 47.5px; text-align: center; }
.tw-slide-nav-btn { width: 31.5px; height: 31.5px; border-radius: var(--tw-radius-pill); background: var(--tw-surface); border: 1px solid var(--tw-border); display: flex; align-items: center; justify-content: center; cursor: pointer; color: var(--tw-text); }
.tw-slide-nav-btn:hover { border-color: var(--tw-primary); color: var(--tw-primary); background: var(--tw-primary-soft); }
.tw-slide-nav-btn svg { width: 15px; height: 15px; }
.tw-slide-thumbs { display: flex; gap: 7px; overflow-x: auto; padding: 14px 19.5px; border-top: 1px solid var(--tw-border); background: var(--tw-surface); }
.tw-slide-thumb { flex-shrink: 0; width: 79px; aspect-ratio: 16/9; border-radius: 5.5px; border: 2px solid var(--tw-border); overflow: hidden; cursor: pointer; opacity: .65; background: #fff; }
.tw-slide-thumb svg { width: 100%; height: 100%; }
.tw-slide-thumb:hover { opacity: 1; }
.tw-slide-thumb-active { border-color: var(--tw-primary); opacity: 1; box-shadow: 0 0 0 2px var(--tw-primary-soft); }
.tw-theme-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(108px, 1fr)); gap: 8px; padding-top: 4px; }
.tw-theme-swatch {
  position: relative; height: 58px; border-radius: var(--tw-radius-sm); border: 2px solid transparent;
  cursor: pointer; overflow: hidden; display: flex; align-items: flex-end; transition: border-color .15s ease, transform .1s ease;
}
.tw-theme-swatch::after { content: ""; position: absolute; inset: 0; background: linear-gradient(transparent 40%, rgba(10, 12, 20, .58)); }
.tw-theme-swatch input { position: absolute; inset: 0; opacity: 0; cursor: pointer; margin: 0; z-index: 1; }
.tw-theme-swatch-name { position: relative; z-index: 1; color: #fff; font-size: 9.5px; font-weight: 800; padding: 0 6px 5px; line-height: 1.2; text-shadow: 0 1px 2px rgba(0,0,0,.35); }
.tw-theme-swatch:hover { transform: translateY(-1px); }
.tw-theme-swatch:has(input:checked) { border-color: var(--tw-text); box-shadow: var(--tw-shadow-sm); }
.tw-theme-swatch:has(input:focus-visible) { outline: 2px solid var(--tw-primary); outline-offset: 2px; }
.tw-theme-swatch-active { border-color: var(--tw-text); }

/* ==========================================================================
   Trò chơi ôn tập
   ========================================================================== */
.tw-mode-switch { display: flex; gap: 5.5px; margin-bottom: 16px; background: var(--tw-surface-alt); padding: 3.5px; border-radius: var(--tw-radius-pill); width: fit-content; border: 1px solid var(--tw-border); }
.tw-mode-btn { padding: 7px 16px; border-radius: var(--tw-radius-pill); font-size: 11px; font-weight: 800; color: var(--tw-text-muted); cursor: pointer; border: none; background: transparent; }
.tw-mode-btn-active { background: var(--tw-surface); color: var(--tw-primary); box-shadow: var(--tw-shadow-sm); }
.tw-wheel-area { display: flex; flex-direction: column; align-items: center; padding: 26.5px 17.5px; }
.tw-wheel-wrap { position: relative; width: 246.5px; height: 246.5px; }
.tw-wheel-svg { width: 100%; height: 100%; transition: transform 4.5s cubic-bezier(.17,.67,.16,.99); filter: drop-shadow(0 9px 17.5px rgba(20,24,36,.12)); }
.tw-wheel-pointer { position: absolute; top: -5.5px; left: 50%; transform: translateX(-50%); width: 0; height: 0; border-left: 10.5px solid transparent; border-right: 10.5px solid transparent; border-top: 17.5px solid var(--tw-danger); z-index: 5; filter: drop-shadow(0 2px 2px rgba(0,0,0,.15)); }
.tw-wheel-result { margin-top: 17.5px; font-size: 16px; font-weight: 800; color: var(--tw-primary-darker); min-height: 24.5px; text-align: center; }
.tw-team-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 5.5px; }
.tw-team-tag { display: inline-flex; align-items: center; gap: 5.5px; padding: 5.5px 10.5px; border-radius: var(--tw-radius-pill); background: var(--tw-primary-soft); color: var(--tw-primary-darker); font-size: 10.5px; font-weight: 700; }
.tw-team-tag button { border: none; background: transparent; color: inherit; cursor: pointer; display: flex; opacity: .6; }
.tw-team-tag button:hover { opacity: 1; }
.tw-team-tag button svg { width: 11.5px; height: 11.5px; }

.tw-quiz-stage { padding: 21px; }
.tw-quiz-progress { height: 5.5px; border-radius: var(--tw-radius-pill); background: var(--tw-surface-alt); overflow: hidden; margin-bottom: 17.5px; }
.tw-quiz-progress-bar { height: 100%; background: var(--tw-primary); transition: width .3s ease; }
.tw-quiz-question { font-size: 14.5px; font-weight: 800; margin-bottom: 16px; text-align: center; }
.tw-quiz-options { display: grid; grid-template-columns: 1fr 1fr; gap: 10.5px; max-width: 563px; margin: 0 auto; }
.tw-quiz-option {
  display: flex; align-items: center; gap: 9px; padding: 12.5px 14px; border-radius: var(--tw-radius);
  border: 1px solid var(--tw-border); background: var(--tw-surface); cursor: pointer; font-size: 12px; font-weight: 700;
  text-align: left; transition: all .12s ease;
}
.tw-quiz-option:hover { border-color: var(--tw-primary); background: var(--tw-primary-soft); }
.tw-quiz-option-correct { border-color: var(--tw-success); background: var(--tw-success-soft) !important; }
.tw-quiz-option-wrong { border-color: var(--tw-danger); background: var(--tw-danger-soft) !important; }
.tw-quiz-option[disabled] { cursor: default; }
.tw-scoreboard { display: flex; justify-content: center; gap: 9px; flex-wrap: wrap; margin-bottom: 17.5px; }
.tw-score-pill { display: flex; align-items: center; gap: 7px; padding: 7px 14px; border-radius: var(--tw-radius-pill); background: var(--tw-surface-alt); font-size: 11px; font-weight: 800; border: 1px solid var(--tw-border); }
.tw-score-pill-turn { border-color: var(--tw-primary); background: var(--tw-primary-soft); color: var(--tw-primary-darker); }
.tw-quiz-timer { text-align: center; font-size: 10.5px; font-weight: 800; color: var(--tw-text-soft); margin-bottom: 3.5px; }
.tw-quiz-result { text-align: center; padding: 26.5px 17.5px; }
.tw-quiz-result-trophy { width: 54.5px; height: 54.5px; margin: 0 auto 12.5px; color: var(--tw-warning); }
.tw-confetti-layer { position: fixed; inset: 0; pointer-events: none; z-index: 999; overflow: hidden; }
.tw-confetti-piece { position: absolute; top: -10.5px; border-radius: 2px; opacity: 0; }
@keyframes tw-confetti-fall {
  0% { transform: translateY(-10px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(560deg); opacity: 0; }
}

/* ---------- Toast ---------- */
.tw-toast {
  position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%) translateY(20px);
  background: var(--tw-gray-1100); color: #fff; padding: 9.5px 17.5px; border-radius: var(--tw-radius-pill); font-size: 11.5px; font-weight: 700;
  box-shadow: 0 10.5px 26.5px -7px rgba(20, 24, 36, .45); opacity: 0; pointer-events: none; transition: all .25s ease; z-index: 200;
  display: flex; align-items: center; gap: 7px;
}
.tw-toast.tw-toast-show { opacity: 1; transform: translateX(-50%) translateY(0); }
.tw-toast-success { background: var(--tw-success-dark); }
.tw-toast-danger { background: var(--tw-danger-dark); }

/* ---------- Print ---------- */
@media print {
  .tw-sidebar, .tw-footer, .tw-toast, .tw-no-print { display: none !important; }
  .tw-shell { background: #fff; }
  .tw-app { display: block; min-height: 0; }
  .tw-main { padding: 0; }
  .tw-grid { display: block; }
  .tw-panel { box-shadow: none; border: none; }
  .tw-lp-activity-body { display: flex !important; }
}

/* ---------- Responsive ---------- */
@media (max-width: 980px) {
  .tw-grid { grid-template-columns: 1fr; }
  .tw-lp-goal-grid { grid-template-columns: 1fr; }
  .tw-lp-prep-grid { grid-template-columns: 1fr; }
  .tw-stat-row { grid-template-columns: repeat(2, 1fr); }
  .tw-option-list { grid-template-columns: 1fr; }
  .tw-quiz-options { grid-template-columns: 1fr; }
}
@media (max-width: 900px) {
  .tw-app { flex-direction: column; }
  .tw-sidebar {
    width: 100%; height: auto; position: sticky; top: 0;
    flex-direction: row; align-items: center; border-right: none; border-bottom: 1px solid var(--tw-border);
  }
  .tw-sidebar-brand { padding: 10.5px 14px; }
  .tw-sidebar-label { display: none; }
  .tw-sidebar-toggle { display: none; }
  .tw-sidebar-nav { flex: 1; flex-direction: row; padding: 7px 9px; overflow-x: auto; gap: 3.5px; scrollbar-width: thin; }
  .tw-tool-tab { white-space: nowrap; }
  .tw-sidebar-foot { border-top: none; border-left: 1px solid var(--tw-border); }
}
@media (max-width: 620px) {
  .tw-page-head { flex-direction: column; }
  .tw-row-2, .tw-row-3 { grid-template-columns: 1fr; }
  .tw-exam-summary .tw-stat-row { grid-template-columns: 1fr 1fr; }
  .tw-back-link span { display: none; }
}