/* ============================================================
   HOBI CLASSROOM — Giao diện clone Google Classroom
   3 theme: mặc định (sáng) / Hobi (tông màu logo) / Tối
   ============================================================ */

/* ---------- THEME 1: Mặc định ---------- */
:root,
body[data-theme="light"] {
  --cr-bg: #ffffff;
  --cr-surface: #ffffff;
  --cr-surface-2: var(--cr-surface-2);
  --cr-surface-3: var(--cr-surface-3);
  --cr-border: #dadce0;
  --cr-border-2: #e0e3e7;
  --cr-border-strong: var(--cr-border-strong);
  --cr-text: #1f1f1f;
  --cr-text-2: #444746;
  --cr-text-3: #5f6368;
  --cr-text-4: #80868b;
  --cr-primary: #0b57d0;
  --cr-primary-strong: #0842a0;
  --cr-on-primary: #ffffff;
  --cr-primary-container: #c2e7ff;
  --cr-on-primary-container: #001d35;
  --cr-primary-soft: var(--cr-primary-soft);
  --cr-on-primary-soft: var(--cr-on-primary-soft);
  --cr-primary-icon: var(--cr-primary-icon);
  --cr-success: #188038;
  --cr-success-bg: #e6f4ea;
  --cr-warn: #e8710a;
  --cr-warn-strong: #b06000;
  --cr-warn-bg: #fef7e0;
  --cr-danger: #c5221f;
  --cr-danger-bg: #fce8e6;
  --cr-hover: rgba(68, 71, 70, 0.08);
  --cr-scrim: rgba(32, 33, 36, 0.5);
  --cr-snackbar-bg: #323232;
  --cr-snackbar-fg: #ffffff;
  --cr-topbar-h: 64px;
  --cr-drawer-w: 320px;
  --cr-shadow-1: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
  --cr-shadow-2: 0 1px 3px 0 rgba(60, 64, 67, 0.3), 0 4px 8px 3px rgba(60, 64, 67, 0.15);
  --cr-font: "Google Sans", "Google Sans Text", Roboto, "Segoe UI", Arial, sans-serif;
}

/* ---------- THEME 2: Hobi (tông màu logo: navy / vàng / cam / xanh nhạt) ---------- */
body[data-theme="hobi"] {
  --cr-bg: #eef4fd;
  --cr-surface: #ffffff;
  --cr-surface-2: #e7eefb;
  --cr-surface-3: #d8e4f8;
  --cr-border: #c6d6ef;
  --cr-border-2: #dbe5f5;
  --cr-border-strong: #8ea3c4;
  --cr-text: #14243d;
  --cr-text-2: #35496b;
  --cr-text-3: #55688a;
  --cr-text-4: #8093b0;
  --cr-primary: #1e3a6e;
  --cr-primary-strong: #142a52;
  --cr-on-primary: #ffffff;
  --cr-primary-container: #ffe27a;
  --cr-on-primary-container: #53400a;
  --cr-primary-soft: #e1ebfc;
  --cr-on-primary-soft: #274a86;
  --cr-primary-icon: #1e4b8f;
  --cr-success: #188038;
  --cr-success-bg: #e2f4e8;
  --cr-warn: #e8710a;
  --cr-warn-strong: #a35c00;
  --cr-warn-bg: #fef3dd;
  --cr-danger: #c5221f;
  --cr-danger-bg: #fce8e6;
  --cr-hover: rgba(30, 58, 110, 0.08);
  --cr-scrim: rgba(20, 36, 61, 0.5);
  --cr-snackbar-bg: #1e3a6e;
  --cr-snackbar-fg: #ffffff;
}

/* ---------- THEME 3: Tối ---------- */
body[data-theme="dark"] {
  --cr-bg: #131314;
  --cr-surface: #1e1f20;
  --cr-surface-2: #2a2b2d;
  --cr-surface-3: #35363a;
  --cr-border: #3c4043;
  --cr-border-2: #2f3134;
  --cr-border-strong: #5f6368;
  --cr-text: #e3e3e3;
  --cr-text-2: #c4c7c5;
  --cr-text-3: #9aa0a6;
  --cr-text-4: #7c8085;
  --cr-primary: #a8c7fa;
  --cr-primary-strong: #bcd3fb;
  --cr-on-primary: #062e6f;
  --cr-primary-container: #004a77;
  --cr-on-primary-container: #c2e7ff;
  --cr-primary-soft: #1f3450;
  --cr-on-primary-soft: #a8c7fa;
  --cr-primary-icon: #a8c7fa;
  --cr-success: #6dd58c;
  --cr-success-bg: #1f3325;
  --cr-warn: #f5c76a;
  --cr-warn-strong: #f5c76a;
  --cr-warn-bg: #3a2f14;
  --cr-danger: #f2b8b5;
  --cr-danger-bg: #3a2422;
  --cr-hover: rgba(227, 227, 227, 0.08);
  --cr-scrim: rgba(0, 0, 0, 0.6);
  --cr-snackbar-bg: #e3e3e3;
  --cr-snackbar-fg: #1f1f1f;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: var(--cr-font);
  color: var(--cr-text);
  background: var(--cr-bg);
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

button {
  font-family: var(--cr-font);
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

a {
  color: var(--cr-primary);
  text-decoration: none;
}

/* ============================================================
   CLASS PHỤ TRỢ CHO CÁC THẺ (thay style inline trong HTML)
   ============================================================ */
/* Thẻ lớp học */
.cr-card-head-status {
  position: absolute;
  top: 10px;
  right: 12px;
}

.cr-card-head-chips,
.cr-detail-banner-chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.cr-card-head-chips {
  margin-top: 10px;
}

.cr-detail-banner-chips {
  margin-top: 12px;
}

.cr-card-coso {
  font-size: 12px;
  color: var(--cr-text-4);
}

/* Hàng danh sách */
.cr-cell-name-text {
  min-width: 0;
}

.cr-cell-progress {
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
}

.cr-progress-sm {
  width: 100%;
  max-width: 140px;
}

/* Trang chi tiết */
.cr-stat-value-sm {
  font-size: 15px;
}

.cr-section-head-gap {
  margin-top: 28px;
}

/* ============================================================
   ANIMATION
   ============================================================ */
@keyframes cr-fade-up {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes cr-fade-down {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes cr-grow-x {
  from {
    transform: scaleX(0);
  }
  to {
    transform: scaleX(1);
  }
}

@keyframes cr-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(217, 37, 29, 0.45);
  }
  70% {
    box-shadow: 0 0 0 6px rgba(217, 37, 29, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(217, 37, 29, 0);
  }
}

.cr-anim-up {
  animation: cr-fade-up 0.38s cubic-bezier(0.2, 0, 0, 1) both;
}

.cr-anim-down {
  animation: cr-fade-down 0.26s cubic-bezier(0.2, 0, 0, 1) both;
}

.cr-grow {
  transform-origin: left center;
  animation: cr-grow-x 0.8s cubic-bezier(0.2, 0, 0, 1) both;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
   TOP APP BAR
   ============================================================ */
.cr-topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--cr-topbar-h);
  background: var(--cr-surface);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 8px;
  z-index: 100;
}

.cr-topbar-left {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1 1 0;
  min-width: 0;
}

.cr-topbar-center {
  flex: 2 1 0;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.cr-topbar-right {
  flex: 1 1 0;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
}

.cr-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px 8px 8px;
  border-radius: 24px;
  color: var(--cr-text-2);
  cursor: pointer;
}

.cr-brand:hover {
  background: var(--cr-hover);
}

.cr-brand-text {
  font-size: 22px;
  color: var(--cr-text-2);
  letter-spacing: 0.2px;
  white-space: nowrap;
}

/* Logo dự án cạnh chữ "Lớp học" */
.cr-brand-logo {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  object-fit: cover;
  display: block;
  box-shadow: 0 0 0 1px var(--cr-border);
}

.cr-icon-btn {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--cr-text-2);
  flex: 0 0 auto;
}

.cr-icon-btn:hover {
  background: var(--cr-hover);
}

.cr-notif-dot {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cr-danger);
  border: 2px solid var(--cr-surface);
  animation: cr-pulse 2.2s ease-out infinite;
}

/* Logo dự án ở góc phải trên */
.cr-logo-img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  object-fit: cover;
  margin-left: 8px;
  flex: 0 0 auto;
  display: block;
  box-shadow: 0 0 0 1px var(--cr-border);
}

/* Search pill */
.cr-search {
  width: 100%;
  max-width: 720px;
  height: 48px;
  background: var(--cr-surface-2);
  border-radius: 24px;
  display: flex;
  align-items: center;
  padding: 0 8px 0 16px;
  transition: background 0.15s, box-shadow 0.15s;
}

.cr-search:focus-within {
  background: var(--cr-surface);
  box-shadow: 0 1px 3px rgba(60, 64, 67, 0.3), inset 0 0 0 1px var(--cr-border);
}

.cr-search-icon {
  color: var(--cr-text-3);
  flex: 0 0 auto;
}

.cr-search input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  height: 100%;
  padding: 0 12px;
  font-size: 16px;
  font-family: var(--cr-font);
  color: var(--cr-text);
}

.cr-search input::placeholder {
  color: var(--cr-text-3);
}

/* ============================================================
   LAYOUT + DRAWER
   ============================================================ */
.cr-body {
  padding-top: var(--cr-topbar-h);
  min-height: 100vh;
}

.cr-drawer {
  position: fixed;
  top: var(--cr-topbar-h);
  left: 0;
  bottom: 0;
  width: var(--cr-drawer-w);
  background: var(--cr-surface);
  overflow-y: auto;
  padding: 12px 12px 24px;
  display: flex;
  flex-direction: column;
  z-index: 90;
}

.cr-drawer-nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.cr-drawer-item {
  display: flex;
  align-items: center;
  gap: 14px;
  height: 48px;
  padding: 0 16px;
  border-radius: 24px;
  color: var(--cr-text-2);
  font-size: 14px;
  font-weight: 500;
  text-align: left;
  width: 100%;
  transition: background 0.12s;
  flex: 0 0 auto;
}

.cr-drawer-item:hover {
  background: var(--cr-hover);
}

.cr-drawer-item.active {
  background: var(--cr-primary-container);
  color: var(--cr-on-primary-container);
}

.cr-drawer-item.active svg {
  color: var(--cr-on-primary-container);
}

.cr-drawer-label {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cr-drawer-badge {
  font-size: 12px;
  font-weight: 500;
  color: var(--cr-text-2);
  background: var(--cr-surface-2);
  border-radius: 10px;
  min-width: 22px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 7px;
}

.cr-drawer-badge.danger {
  background: var(--cr-danger-bg);
  color: var(--cr-danger);
}

.cr-drawer-badge.warn {
  background: var(--cr-warn-bg);
  color: #b06000;
}

.cr-drawer-item.active .cr-drawer-badge {
  background: color-mix(in srgb, var(--cr-on-primary-container) 15%, transparent);
  color: var(--cr-on-primary-container);
}

.cr-drawer-item.active .cr-drawer-badge.danger {
  background: var(--cr-danger);
  color: var(--cr-danger-bg);
}

.cr-drawer-section {
  font-size: 13px;
  font-weight: 500;
  color: var(--cr-text-2);
  padding: 20px 16px 8px;
}

/* Hộp trạng thái dữ liệu */
.cr-storage-box {
  margin-top: 24px;
  background: var(--cr-primary-soft);
  border-radius: 16px;
  padding: 16px;
  font-size: 13px;
  color: var(--cr-on-primary-soft);
}

.cr-storage-header {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
  margin-bottom: 10px;
}

.cr-storage-details {
  display: flex;
  flex-direction: column;
  gap: 4px;
  line-height: 1.5;
}

.cr-storage-sync {
  margin-top: 10px;
  font-size: 12px;
  color: var(--cr-on-primary-soft);
}

.cr-scrim {
  position: fixed;
  inset: 0;
  background: var(--cr-scrim);
  z-index: 80;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.3s ease, visibility 0.3s;
}

body.drawer-open .cr-scrim {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* ============================================================
   MAIN CANVAS
   ============================================================ */
.cr-main {
  margin-left: var(--cr-drawer-w);
  padding: 20px 28px 64px;
  min-height: calc(100vh - var(--cr-topbar-h));
}

.cr-canvas {
  max-width: 1180px;
  margin: 0 auto;
}

/* ---- Page header (kiểu trang Việc cần làm) ---- */
.cr-page-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

/* Cụm nút/bộ chọn bên phải tiêu đề trang (VD: ngưỡng cảnh báo + sao chép) */
.cr-page-head-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.cr-page-title {
  font-size: 24px;
  font-weight: 400;
  margin: 12px 0 4px;
  color: var(--cr-text);
}

.cr-page-sub {
  font-size: 14px;
  color: var(--cr-text-3);
  margin: 0 0 12px;
}

/* ---- Thanh chip lọc + toggle ---- */
.cr-chips-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin: 8px 0 20px;
}

.cr-chips {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.cr-chip {
  height: 32px;
  padding: 0 14px;
  border-radius: 8px;
  background: var(--cr-surface-2);
  color: var(--cr-text-2);
  font-size: 13px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.12s;
}

.cr-chip:hover {
  background: var(--cr-surface-3);
}

.cr-chip.active {
  background: var(--cr-primary-container);
  color: var(--cr-on-primary-container);
}

.cr-chip-select {
  height: 32px;
  border: none;
  border-radius: 8px;
  background: var(--cr-surface-2);
  color: var(--cr-text-2);
  font-family: var(--cr-font);
  font-size: 13px;
  font-weight: 500;
  padding: 0 8px;
  outline: none;
  cursor: pointer;
}

.cr-chip-select:focus {
  background: var(--cr-primary-container);
}

.cr-view-toggle {
  display: inline-flex;
  border: 1px solid var(--cr-border);
  border-radius: 20px;
  overflow: hidden;
}

.cr-view-toggle .toggle-btn {
  width: 40px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--cr-text-2);
}

.cr-view-toggle .toggle-btn:hover {
  background: var(--cr-hover);
}

.cr-view-toggle .toggle-btn.active {
  background: var(--cr-primary-container);
  color: var(--cr-on-primary-container);
}

/* ============================================================
   THẺ LỚP HỌC (Class card) — trang Tất cả học sinh
   ============================================================ */
.cr-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(296px, 1fr));
  gap: 20px;
}

.cr-card {
  border: 1px solid var(--cr-border);
  border-radius: 16px;
  overflow: hidden;
  background: var(--cr-surface);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.15s, transform 0.18s;
}

.cr-card:hover {
  box-shadow: var(--cr-shadow-1);
  transform: translateY(-2px);
}

.cr-card-head {
  position: relative;
  min-height: 124px;
  padding: 18px 20px 12px;
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  background-size: cover;
}

.cr-card-head .cr-card-kebab-top {
  position: absolute;
  top: 8px;
  right: 8px;
  color: rgba(255, 255, 255, 0.9);
}

.cr-card-title {
  font-size: 21px;
  font-weight: 400;
  line-height: 1.25;
  margin: 0 0 4px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

.cr-card-sub {
  font-size: 13px;
  opacity: 0.92;
}

.cr-card-body {
  padding: 12px 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.cr-card-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
}

.cr-card-teacher {
  font-size: 13px;
  color: var(--cr-text-2);
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  flex: 1;
}

.cr-card-kebab {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--cr-text-3);
  flex: 0 0 auto;
}

.cr-card-kebab:hover {
  background: var(--cr-hover);
}

/* ---- Chip nhỏ (Khoá / Hệ) ---- */
.cr-chip-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 24px;
  padding: 0 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  white-space: nowrap;
}

.cr-chip-badge.khoa {
  background: var(--cr-surface-2);
  color: var(--cr-text-2);
}

.cr-chip-badge.he {
  background: var(--cr-primary-soft);
  color: var(--cr-on-primary-soft);
}

.cr-chip-badge.warn {
  background: var(--cr-warn-bg);
  color: #b06000;
}

.cr-chip-badge.done {
  background: var(--cr-success-bg);
  color: var(--cr-success);
}

.cr-chip-badge.onhead {
  background: rgba(255, 255, 255, 0.22);
  color: #fff;
}

/* Chip báo cáo định kì — vàng logo, nổi trên cả nền màu lẫn nền trắng */
.cr-chip-badge.dinhki {
  background: #f4c531;
  color: #3a2f05;
}

/* ---- Thanh tiến độ buổi ---- */
.cr-progress {
  height: 6px;
  border-radius: 3px;
  background: var(--cr-surface-3);
  overflow: hidden;
}

.cr-progress-fill {
  height: 100%;
  border-radius: 3px;
  background: var(--cr-primary);
  transition: width 0.3s;
}

.cr-progress-fill.warning {
  background: var(--cr-warn);
}

.cr-progress-fill.done {
  background: var(--cr-success);
}

.cr-progress-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
}

.cr-progress-label {
  font-size: 13px;
  color: var(--cr-text-2);
}

.cr-progress-label strong {
  color: var(--cr-text);
  font-weight: 500;
}

/* ---- Trạng thái dạng chấm ---- */
.cr-status-text {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--cr-text-2);
}

.cr-status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cr-success);
  flex: 0 0 auto;
}

.cr-status-dot.warning {
  background: var(--cr-warn);
}

.cr-status-dot.done {
  background: var(--cr-text-4);
}

/* ============================================================
   DANH SÁCH DẠNG HÀNG (list view)
   ============================================================ */
.cr-list-box {
  border: 1px solid var(--cr-border);
  border-radius: 16px;
  overflow: hidden;
}

.cr-list-row {
  display: grid;
  grid-template-columns: minmax(220px, 2.2fr) 1.4fr 1.2fr 1.2fr 0.9fr;
  gap: 12px;
  align-items: center;
  padding: 12px 20px;
  border-bottom: 1px solid var(--cr-border-2);
  background: var(--cr-surface);
  cursor: pointer;
}

.cr-list-row:last-child {
  border-bottom: none;
}

.cr-list-row:hover {
  background: var(--cr-surface-3);
}

.cr-list-row.cr-list-head {
  cursor: default;
  background: var(--cr-surface-2);
  font-size: 12px;
  font-weight: 500;
  color: var(--cr-text-2);
  padding-top: 14px;
  padding-bottom: 14px;
}

.cr-list-row.cr-list-head:hover {
  background: var(--cr-surface-2);
}

.cr-cell-name {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.cr-cell-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 500;
  flex: 0 0 auto;
}

.cr-name-main {
  font-size: 14px;
  font-weight: 500;
  color: var(--cr-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cr-name-sub {
  font-size: 12px;
  color: var(--cr-text-3);
}

.cr-cell {
  font-size: 13px;
  color: var(--cr-text-2);
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  min-width: 0;
}

.cr-cell .muted {
  color: var(--cr-text-4);
  font-size: 12px;
}

/* ============================================================
   NÚT (M3 Google)
   ============================================================ */
.cr-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 22px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  transition: box-shadow 0.15s, background 0.15s;
  white-space: nowrap;
}

.cr-btn.filled {
  background: var(--cr-primary);
  color: var(--cr-on-primary);
}

.cr-btn.filled:hover {
  background: var(--cr-primary-strong);
  box-shadow: var(--cr-shadow-1);
}

.cr-btn.tonal {
  background: var(--cr-primary-container);
  color: var(--cr-on-primary-container);
}

.cr-btn.tonal:hover {
  box-shadow: var(--cr-shadow-1);
}

.cr-btn.outline {
  border: 1px solid var(--cr-border-strong);
  color: var(--cr-primary);
  background: var(--cr-surface);
}

.cr-btn.outline:hover {
  background: var(--cr-surface-2);
}

.cr-btn.small {
  height: 34px;
  padding: 0 16px;
  font-size: 13px;
}

.cr-text-btn {
  color: var(--cr-primary);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 8px;
}

.cr-text-btn:hover {
  background: var(--cr-primary-soft);
}

/* ---- Select chuẩn ---- */
.cr-select {
  height: 40px;
  border: 1px solid var(--cr-border);
  border-radius: 8px;
  background: var(--cr-surface);
  font-family: var(--cr-font);
  font-size: 14px;
  color: var(--cr-text);
  padding: 0 12px;
  outline: none;
  cursor: pointer;
}

.cr-select:focus {
  border-color: var(--cr-primary);
  box-shadow: inset 0 0 0 1px var(--cr-primary);
}

.cr-inline-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--cr-text-2);
  font-weight: 500;
}

/* ============================================================
   TRANG THÔNG BÁO CUỐI KHOÁ
   ============================================================ */
.cr-notice-card {
  border: 1px solid var(--cr-border);
  border-radius: 16px;
  background: var(--cr-surface);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
  transition: box-shadow 0.15s;
}

.cr-notice-card:hover {
  box-shadow: var(--cr-shadow-1);
}

.cr-notice-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

.cr-notice-icon.warning {
  background: var(--cr-warn-bg);
  color: #b06000;
}

.cr-notice-icon.done {
  background: var(--cr-success-bg);
  color: var(--cr-success);
}

.cr-notice-icon.info {
  background: var(--cr-primary-soft);
  color: var(--cr-on-primary-soft);
}

.cr-notice-main {
  flex: 1;
  min-width: 0;
  cursor: pointer;
}

.cr-notice-msg {
  font-size: 14px;
  font-weight: 500;
  color: var(--cr-text);
  margin-bottom: 4px;
}

.cr-notice-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 12px;
  color: var(--cr-text-3);
}

.cr-notice-empty {
  border: 1px dashed var(--cr-border);
  border-radius: 16px;
  padding: 48px 24px;
  text-align: center;
  color: var(--cr-text-3);
  font-size: 14px;
  background: var(--cr-surface-2);
}

/* ============================================================
   TRANG CHI TIẾT HỌC SINH (kiểu trang lớp học)
   ============================================================ */
.cr-detail-banner {
  position: relative;
  border-radius: 16px;
  color: #fff;
  padding: 24px 28px;
  min-height: 168px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  background-size: cover;
  margin-bottom: 16px;
}

.cr-detail-back {
  position: absolute;
  top: 12px;
  left: 12px;
  color: #fff;
}

.cr-detail-back:hover {
  background: rgba(255, 255, 255, 0.15);
}

.cr-detail-title {
  font-size: 30px;
  font-weight: 400;
  margin: 0 0 6px;
  line-height: 1.2;
}

.cr-detail-sub {
  font-size: 14px;
  opacity: 0.92;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

/* Tab bar kiểu Stream / Classwork */
.cr-tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--cr-border);
  margin-bottom: 20px;
}

.cr-tab {
  padding: 12px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--cr-text-3);
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
}

.cr-tab:hover {
  color: var(--cr-text);
  background: var(--cr-hover);
  border-radius: 8px 8px 0 0;
}

.cr-tab.active {
  color: var(--cr-primary);
  border-bottom-color: var(--cr-primary);
}

/* Thẻ thông tin thống kê */
.cr-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.cr-stat-box {
  border: 1px solid var(--cr-border);
  border-radius: 16px;
  padding: 14px 18px;
  background: var(--cr-surface);
}

.cr-stat-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--cr-text-3);
  text-transform: uppercase;
  letter-spacing: 0.4px;
  margin-bottom: 6px;
}

.cr-stat-value {
  font-size: 20px;
  font-weight: 400;
  color: var(--cr-text);
}

.cr-stat-value small {
  font-size: 13px;
  color: var(--cr-text-3);
  font-weight: 400;
}

/* Banner thông báo cuối khoá trong chi tiết */
.cr-alert-banner {
  border-radius: 16px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.cr-alert-banner.warning {
  background: var(--cr-warn-bg);
}

.cr-alert-banner.success {
  background: var(--cr-success-bg);
}

.cr-alert-banner .cr-notice-icon {
  background: rgba(255, 255, 255, 0.7);
}

.cr-alert-body {
  flex: 1;
  min-width: 240px;
}

.cr-alert-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--cr-text);
  margin-bottom: 4px;
}

.cr-alert-sub {
  font-size: 13px;
  color: var(--cr-text-2);
}

/* Khu điều khiển (chọn gói / hệ / đổi tên) */
.cr-control-card {
  border: 1px solid var(--cr-border);
  border-radius: 16px;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  margin-bottom: 24px;
  background: var(--cr-surface);
}

/* ============================================================
   KHU VỰC "CÁC KHOÁ ĐÃ HỌC" (kiểu Classwork)
   ============================================================ */
.cr-section-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 8px 0 12px;
}

.cr-section-title {
  font-size: 16px;
  font-weight: 500;
  color: var(--cr-text-2);
  white-space: nowrap;
}

.cr-section-line {
  flex: 1;
  height: 1px;
  background: var(--cr-border);
}

.cr-section-count {
  font-size: 13px;
  color: var(--cr-text-3);
}

/* ---- Khối khoá kiểu Classwork (tựa ảnh Google Classroom) ---- */
.cr-khoa-block {
  margin-bottom: 4px;
}

.cr-khoa-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 8px;
  border-bottom: 1px solid var(--cr-border-2);
}

.cr-khoa-title {
  flex: 1;
  font-size: 17px;
  font-weight: 400;
  color: var(--cr-text);
  margin: 0;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
}

.cr-khoa-count {
  font-size: 13px;
  color: var(--cr-text-3);
  white-space: nowrap;
}

.cr-khoa-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--cr-text-3);
  flex: 0 0 auto;
}

.cr-khoa-toggle:hover {
  background: var(--cr-hover);
}

/* Hàng số buổi: icon clipboard nền xanh nhạt — không hiển thị chi tiết */
.cr-session-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 9px 8px;
  border-bottom: 1px solid var(--cr-border-2);
}

.cr-session-icon {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--cr-primary-soft);
  color: var(--cr-primary-icon);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
}

.cr-session-name {
  font-size: 14px;
  color: var(--cr-text);
}

/* Nội dung buổi (phần sau "BUỔI XX" trong tiêu đề) */
.cr-session-content {
  color: var(--cr-text-3);
  font-size: 13px;
  margin-left: 8px;
}

/* Ngày đăng của từng buổi — cột phải như Google Classroom */
.cr-session-date {
  margin-left: auto;
  font-size: 13px;
  color: var(--cr-text-2);
  white-space: nowrap;
  flex: 0 0 auto;
}

/* Gán nhanh hệ học ngay trên thẻ / hàng */
.cr-card-he-row {
  display: flex;
  align-items: center;
}

.cr-he-assign {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--cr-text-3);
}

.cr-mini-select {
  height: 28px;
  border: 1px solid var(--cr-border);
  border-radius: 6px;
  background: var(--cr-surface);
  font-family: var(--cr-font);
  font-size: 12.5px;
  color: var(--cr-text);
  padding: 0 6px;
  outline: none;
  cursor: pointer;
}

.cr-mini-select:hover {
  border-color: var(--cr-border-strong);
}

.cr-mini-select:focus {
  border-color: var(--cr-primary);
  box-shadow: inset 0 0 0 1px var(--cr-primary);
}

/* Khối xếp hệ hàng loạt (trang Chưa xếp hệ) */
.cr-bulk-card {
  border: 1px solid var(--cr-border-strong);
  border-radius: 16px;
  background: var(--cr-primary-soft);
  padding: 18px 20px;
  margin-bottom: 20px;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.cr-bulk-info {
  flex: 1 1 260px;
}

.cr-bulk-info h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 500;
  color: var(--cr-text);
}

.cr-bulk-info p {
  margin: 0;
  font-size: 13px;
  color: var(--cr-text-2);
  line-height: 1.6;
}

.cr-bulk-info code {
  background: var(--cr-primary-soft);
  color: var(--cr-on-primary-soft);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 12px;
}

.cr-bulk-textarea {
  flex: 1 1 320px;
  border: 1px solid var(--cr-border);
  border-radius: 8px;
  font-family: var(--cr-font);
  font-size: 13.5px;
  line-height: 1.6;
  padding: 10px 12px;
  color: var(--cr-text);
  resize: vertical;
  outline: none;
  background: var(--cr-surface);
}

.cr-bulk-textarea:focus {
  border-color: var(--cr-primary);
  box-shadow: inset 0 0 0 1px var(--cr-primary);
}

.cr-bulk-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  width: 100%;
}

.cr-khoa-empty {
  padding: 14px 8px;
  font-size: 13px;
  color: var(--cr-text-3);
  border-bottom: 1px solid var(--cr-border-2);
}

/* ============================================================
   TRANG LẦN CHỈNH SỬA GẦN NHẤT
   ============================================================ */
.cr-recent-row {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--cr-border-2);
  background: var(--cr-surface);
  cursor: pointer;
}

.cr-recent-row:last-child {
  border-bottom: none;
}

.cr-recent-row:hover {
  background: var(--cr-surface-3);
}

.cr-recent-note {
  flex: 1;
  font-size: 13px;
  color: var(--cr-text-2);
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cr-recent-time {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  min-width: 150px;
  flex: 0 0 auto;
}

.cr-recent-rel {
  font-size: 13.5px;
  font-weight: 500;
  color: var(--cr-text);
}

.cr-recent-abs {
  font-size: 12px;
  color: var(--cr-text-3);
}

/* ============================================================
   TRẠNG THÁI TRỐNG / LOADING / TOAST
   ============================================================ */
.cr-empty {
  text-align: center;
  padding: 72px 24px;
  color: var(--cr-text-3);
}

.cr-empty-icon {
  width: 84px;
  height: 84px;
  margin: 0 auto 18px;
  border-radius: 50%;
  background: var(--cr-surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--cr-text-4);
}

.cr-empty h3 {
  font-size: 18px;
  font-weight: 500;
  color: var(--cr-text-2);
  margin: 0 0 6px;
}

.cr-empty p {
  font-size: 14px;
  margin: 0;
}

.cr-loading {
  text-align: center;
  padding: 96px 24px;
  color: var(--cr-text-3);
}

.cr-spinner {
  width: 40px;
  height: 40px;
  margin: 0 auto 18px;
  border-radius: 50%;
  border: 4px solid var(--cr-surface-3);
  border-top-color: #4285f4;
  border-right-color: #34a853;
  border-bottom-color: #fbbc04;
  border-left-color: #ea4335;
  animation: cr-spin 0.9s linear infinite;
}

@keyframes cr-spin {
  to {
    transform: rotate(360deg);
  }
}

.cr-toast {
  position: fixed;
  left: 24px;
  bottom: 24px;
  background: var(--cr-snackbar-bg);
  color: var(--cr-snackbar-fg);
  font-size: 14px;
  padding: 14px 22px;
  border-radius: 8px;
  box-shadow: var(--cr-shadow-2);
  opacity: 0;
  transform: translateY(16px);
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 200;
  max-width: min(560px, calc(100vw - 48px));
}

.cr-toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   HIỆU ỨNG HOVER (PC) — nổi bật hơn khi rê chuột
   ============================================================ */
@media (hover: hover) and (min-width: 1024px) {
  /* Thẻ lớp học: nâng + phóng nhẹ + bóng sâu + hoạ tiết nền trượt */
  .cr-card {
    transition: box-shadow 0.22s cubic-bezier(0.2, 0, 0, 1),
      transform 0.22s cubic-bezier(0.2, 0, 0, 1), border-color 0.22s;
  }

  .cr-card-head {
    transition: background-size 0.5s cubic-bezier(0.2, 0, 0, 1);
  }

  .cr-card:hover {
    transform: translateY(-5px) scale(1.01);
    box-shadow: var(--cr-shadow-2);
    border-color: var(--cr-border-strong);
  }

  .cr-card:hover .cr-card-head {
    background-size: 135% !important;
  }

  /* Mục Drawer: trượt nhẹ sang phải */
  .cr-drawer-item {
    transition: background 0.15s, transform 0.2s cubic-bezier(0.2, 0, 0, 1);
  }

  .cr-drawer-item:not(.active):hover {
    transform: translateX(5px);
  }

  /* Nút tròn topbar / kebab: phóng nhẹ */
  .cr-icon-btn,
  .cr-card-kebab,
  .cr-khoa-toggle {
    transition: background 0.15s, transform 0.18s cubic-bezier(0.2, 0, 0, 1);
  }

  .cr-icon-btn:hover,
  .cr-card-kebab:hover,
  .cr-khoa-toggle:hover {
    transform: scale(1.1);
  }

  /* Nút hành động + chip: nhấp nhô */
  .cr-btn,
  .cr-chip {
    transition: box-shadow 0.18s, background 0.15s, transform 0.18s cubic-bezier(0.2, 0, 0, 1);
  }

  .cr-btn:hover {
    transform: translateY(-2px);
  }

  .cr-chip:hover {
    transform: translateY(-2px);
  }

  /* Thẻ thông báo + hàng danh sách/recent: nâng nhẹ */
  .cr-notice-card,
  .cr-recent-row,
  .cr-course-item {
    transition: box-shadow 0.2s, transform 0.2s cubic-bezier(0.2, 0, 0, 1),
      background 0.15s;
  }

  .cr-notice-card:hover,
  .cr-recent-row:hover {
    transform: translateY(-3px);
    box-shadow: var(--cr-shadow-1);
  }

  /* Avatar trong hàng: phóng nhẹ */
  .cr-cell-avatar {
    transition: transform 0.2s cubic-bezier(0.2, 0, 0, 1);
  }

  .cr-list-row:hover .cr-cell-avatar,
  .cr-recent-row:hover .cr-cell-avatar {
    transform: scale(1.1);
  }
}

/* ============================================================
   THANH SCROLL — luôn hiển thị trên bản PC (kể cả trang ngắn)
   ============================================================ */
@media (min-width: 1024px) {
  html {
    overflow-y: scroll;
    scrollbar-gutter: stable;
  }
}

/* Thanh scroll ăn theo theme (Chrome/Edge — luôn hiển thị, chiếm chỗ cố định) */
::-webkit-scrollbar {
  width: 12px;
  height: 12px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--cr-border-strong);
  border-radius: 8px;
  border: 3px solid transparent;
  background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--cr-text-4);
  border: 3px solid transparent;
  background-clip: padding-box;
}

::-webkit-scrollbar-corner {
  background: transparent;
}

/* Firefox */
@supports not selector(::-webkit-scrollbar) {
  html {
    scrollbar-width: auto;
  }

  * {
    scrollbar-color: var(--cr-border-strong) transparent;
  }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (min-width: 1024px) {
  /* Drawer PC: trượt vào/thu ra mượt khi bấm hamburger */
  .cr-drawer {
    transition: transform 0.34s cubic-bezier(0.2, 0, 0, 1), visibility 0.34s;
  }

  body.drawer-collapsed .cr-drawer {
    transform: translateX(-100%);
    visibility: hidden;
  }

  .cr-main {
    transition: margin-left 0.34s cubic-bezier(0.2, 0, 0, 1);
  }

  body.drawer-collapsed .cr-main {
    margin-left: 0;
  }
}

@media (max-width: 1023px) {
  .cr-drawer {
    transform: translateX(-105%);
    transition: transform 0.34s cubic-bezier(0.2, 0, 0, 1);
  }

  body.drawer-open .cr-drawer {
    transform: translateX(0);
    box-shadow: var(--cr-shadow-2);
  }

  .cr-main {
    margin-left: 0;
    padding: 16px 16px 64px;
  }

  /* Ẩn nút chỉ dùng cho desktop (chuông + lần chỉnh sửa gần nhất đã có ở Drawer) */
  .desk-only {
    display: none !important;
  }

  /* Thanh tìm kiếm thu thành icon kính lúp; bấm mở thanh tìm kiếm trượt xuống */
  .cr-search-toggle {
    display: inline-flex;
  }

  .cr-topbar-center {
    display: contents;
  }

  .cr-search {
    display: none;
  }

  body.search-open .cr-search {
    display: flex;
    position: fixed;
    top: var(--cr-topbar-h);
    left: 10px;
    right: 10px;
    z-index: 99;
    background: var(--cr-surface);
    border: 1px solid var(--cr-border);
    box-shadow: var(--cr-shadow-2);
    animation: cr-fade-down 0.24s cubic-bezier(0.2, 0, 0, 1) both;
  }

  body.search-open .cr-search-toggle {
    background: var(--cr-primary-container);
    color: var(--cr-on-primary-container);
  }

  .cr-topbar-left {
    flex: 1;
  }

  .cr-topbar-right {
    flex: 0 0 auto;
  }
}

@media (min-width: 1024px) {
  .cr-search-toggle {
    display: none;
  }
}

@media (max-width: 720px) {
  .cr-list-row {
    grid-template-columns: 1.6fr 1fr 1fr;
  }

  .cr-list-row .hide-sm {
    display: none;
  }

  .cr-detail-title {
    font-size: 24px;
  }

  .cr-recent-note {
    display: none;
  }
}