:root {
  --bg: #eef2f6;
  --bg-2: #f7f9fc;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --ink: #17202f;
  --ink-2: #344054;
  --muted: #667085;
  --muted-2: #98a2b3;
  --line: #d9e1ec;
  --line-soft: #edf1f6;
  --sidebar: #111827;
  --sidebar-2: #1f2937;
  --sidebar-line: rgba(255, 255, 255, 0.08);
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --accent-soft: #eff6ff;
  --teal: #0f766e;
  --teal-soft: #ecfdf5;
  --amber: #b45309;
  --amber-soft: #fff7ed;
  --danger: #b91c1c;
  --danger-soft: #fef2f2;
  --shadow: 0 14px 32px rgba(16, 24, 40, 0.08);
  --shadow-soft: 0 1px 2px rgba(16, 24, 40, 0.05);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(255, 255, 255, 0) 260px),
    repeating-linear-gradient(90deg, rgba(37, 99, 235, 0.035) 0, rgba(37, 99, 235, 0.035) 1px, transparent 1px, transparent 72px),
    var(--bg);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.18);
  outline-offset: 2px;
}

.app-shell {
  display: grid;
  grid-template-columns: 268px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 20px 14px;
  color: #eef2f7;
  background:
    linear-gradient(180deg, rgba(37, 99, 235, 0.16), rgba(15, 118, 110, 0.09) 42%, transparent),
    linear-gradient(180deg, var(--sidebar), var(--sidebar-2));
  border-right: 1px solid rgba(15, 23, 42, 0.3);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 8px 10px 20px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--sidebar-line);
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, #2563eb, #0f766e);
  box-shadow: 0 12px 28px rgba(37, 99, 235, 0.24);
  font-weight: 850;
}

.brand h1,
.brand p,
.topbar h2,
.topbar p,
.card h3,
.modal h3 {
  margin: 0;
}

.brand h1 {
  font-size: 18px;
  line-height: 1.1;
}

.brand p {
  margin-top: 4px;
  color: #aeb8c7;
  font-size: 12px;
}

.nav {
  display: grid;
  gap: 5px;
}

.nav-item {
  position: relative;
  min-height: 42px;
  border: 0;
  border-radius: 8px;
  padding: 0 12px 0 40px;
  color: #cbd5e1;
  background: transparent;
  text-align: left;
  font-weight: 650;
}

.nav-item::before {
  position: absolute;
  left: 13px;
  top: 50%;
  width: 16px;
  height: 16px;
  transform: translateY(-50%);
  border: 1.8px solid currentColor;
  border-radius: 5px;
  content: "";
  opacity: 0.82;
}

.nav-item:nth-child(1)::before {
  border-radius: 4px;
  box-shadow: inset 6px 0 0 currentColor;
}

.nav-item:nth-child(2)::before {
  border-radius: 999px;
}

.nav-item:nth-child(3)::before {
  border-radius: 3px;
  box-shadow: inset 0 5px 0 currentColor;
}

.nav-item:nth-child(4)::before {
  width: 13px;
  border-radius: 3px;
  box-shadow: 5px -5px 0 -2px currentColor;
}

.nav-item:nth-child(5)::before {
  border-radius: 50%;
  box-shadow: inset 0 -5px 0 currentColor;
}

.nav-item:nth-child(6)::before {
  border-style: dashed;
}

.nav-item:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.075);
}

.nav-item.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
  box-shadow: inset 3px 0 0 #60a5fa;
}

.main {
  min-width: 0;
  padding: 26px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 82px;
  padding: 18px 20px;
  margin-bottom: 18px;
  border: 1px solid rgba(217, 225, 236, 0.86);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(10px);
}

.eyebrow {
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0;
  text-transform: uppercase;
}

.topbar h2 {
  margin-top: 5px;
  font-size: 26px;
  line-height: 1.15;
}

.top-actions,
.row-actions,
.modal-actions,
.toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
}

.top-actions {
  flex: 1;
  justify-content: flex-end;
}

.user-bar {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.hidden {
  display: none !important;
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
  background: var(--bg);
}

.login-shell {
  width: min(420px, 100%);
}

.login-card {
  display: grid;
  gap: 15px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  background: #fff;
  box-shadow: var(--shadow);
}

.login-brand {
  color: var(--ink);
  margin-bottom: 6px;
}

.login-error {
  border: 1px solid #fecaca;
  border-radius: 8px;
  padding: 10px;
  color: var(--danger);
  background: var(--danger-soft);
  font-size: 13px;
  font-weight: 800;
}

.check-line {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.check-line input {
  width: auto;
  min-height: auto;
}

.header-filter {
  display: grid;
  grid-template-columns: 140px 150px 150px;
  gap: 8px;
  align-items: center;
}

.class-header-filter {
  grid-template-columns: 150px 150px 150px;
}

.schedule-header-filter {
  flex: 1 1 620px;
  grid-template-columns: repeat(8, minmax(86px, 1fr));
}

.header-filter input,
.header-filter select {
  min-height: 38px;
}

.row-select {
  min-width: 150px;
  min-height: 38px;
  border-radius: 8px;
  font-weight: 700;
}

.class-row-actions {
  flex-wrap: nowrap;
  justify-content: flex-end;
}

.class-module-list {
  display: grid;
  gap: 14px;
  padding: 14px;
}

.class-module {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #fff;
}

.class-module-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 14px;
  background: #f8fafc;
  border-bottom: 1px solid var(--line-soft);
}

.class-info-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px 14px;
  min-width: 0;
}

.class-info-row strong {
  color: var(--ink);
  font-size: 15px;
}

.class-info-row span:not(.status) {
  color: var(--muted);
  font-size: 13px;
}

.class-timetable-list {
  display: grid;
  gap: 8px;
  padding: 12px 14px 14px;
  background: #fbfdff;
}

.timetable-list-item {
  display: grid;
  gap: 4px;
  width: 100%;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  padding: 9px 12px;
  text-align: left;
  background: #fff;
}

.timetable-list-item:hover {
  border-color: #bfdbfe;
  background: #eff6ff;
}

.timetable-list-item strong {
  color: var(--ink);
}

.timetable-list-item span {
  color: var(--muted);
  font-size: 12px;
}

.compact-empty {
  min-height: 38px;
  padding: 9px 12px;
}

.tight-toolbar {
  flex-wrap: nowrap;
}

.batch-actions {
  flex-wrap: nowrap;
}

.primary-btn,
.ghost-btn,
.danger-btn,
.icon-btn {
  min-height: 38px;
  border: 1px solid transparent;
  border-radius: 8px;
  padding: 0 14px;
  font-weight: 750;
  transition: transform 0.16s ease, box-shadow 0.16s ease, background-color 0.16s ease, border-color 0.16s ease;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.52;
  transform: none;
  box-shadow: none;
}

.primary-btn {
  color: #fff;
  background: linear-gradient(180deg, var(--accent), var(--accent-dark));
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.24);
}

.primary-btn:hover,
.ghost-btn:hover,
.danger-btn:hover,
.icon-btn:hover {
  transform: translateY(-1px);
}

.ghost-btn {
  color: var(--ink);
  background: #fff;
  border-color: var(--line);
  box-shadow: var(--shadow-soft);
}

.topbar > div:first-child {
  flex: 0 0 auto;
}

.ghost-btn:hover {
  border-color: #b8c4d4;
  background: var(--panel-soft);
}

.danger-btn {
  color: var(--danger);
  background: var(--danger-soft);
  border-color: #fecaca;
}

.icon-btn {
  width: 38px;
  padding: 0;
  color: var(--muted);
  background: var(--panel-soft);
  border-color: var(--line);
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 16px;
}

.card,
.table-panel,
.form-panel {
  border: 1px solid rgba(217, 225, 236, 0.94);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-soft);
}

.card {
  position: relative;
  min-height: 128px;
  padding: 17px 17px 15px;
  overflow: hidden;
}

.card::before {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), var(--teal));
  content: "";
}

.card:nth-child(2)::before {
  background: linear-gradient(90deg, var(--teal), #22c55e);
}

.card:nth-child(3)::before {
  background: linear-gradient(90deg, #7c3aed, var(--accent));
}

.card:nth-child(4)::before {
  background: linear-gradient(90deg, #f59e0b, #ef4444);
}

.card h3 {
  color: var(--muted);
  font-size: 13px;
  font-weight: 750;
}

.metric {
  margin-top: 12px;
  font-size: 34px;
  line-height: 1;
  font-weight: 850;
  letter-spacing: 0;
}

.metric-note {
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.48fr) minmax(300px, 0.84fr);
  gap: 16px;
}

.dashboard-control {
  display: grid;
  grid-template-columns: minmax(180px, 1fr) auto minmax(240px, 320px) auto;
  gap: 14px;
  align-items: center;
  margin-bottom: 16px;
  padding: 16px;
  border: 1px solid rgba(217, 225, 236, 0.94);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-soft);
}

.dashboard-control h3 {
  margin: 4px 0 0;
  font-size: 20px;
}

.dashboard-filter label {
  min-width: 220px;
}

.segmented-control {
  display: inline-flex;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
}

.segmented-control button {
  min-height: 34px;
  border: 0;
  border-radius: 7px;
  padding: 0 12px;
  color: var(--muted);
  background: transparent;
  font-weight: 800;
}

.segmented-control button.active {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 6px 14px rgba(37, 99, 235, 0.18);
}

.dashboard-summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 16px;
}

.dashboard-summary-grid .metric {
  font-size: 26px;
  line-height: 1.18;
  overflow-wrap: anywhere;
}

.lesson-mini-list {
  display: grid;
  gap: 8px;
}

.lesson-mini-item {
  display: grid;
  grid-template-columns: 116px minmax(140px, 1fr) auto;
  gap: 10px;
  align-items: center;
  padding: 8px 10px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: #fbfcfe;
}

.lesson-mini-item span {
  color: var(--muted);
  font-size: 12px;
}

.lesson-mini-item strong {
  min-width: 0;
  overflow-wrap: anywhere;
}

.lesson-mini-item em {
  font-style: normal;
  font-size: 12px;
  font-weight: 800;
}

.lesson-mini-item em.done {
  color: var(--teal);
}

.lesson-mini-item em.pending {
  color: var(--amber);
}

.lesson-mini-item em.cancelled {
  color: #64748b;
}

.record-list {
  display: grid;
  gap: 10px;
  padding: 14px;
}

.record-item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  padding: 12px;
  background: #fff;
}

.record-title-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
}

.record-title-line strong {
  color: var(--ink);
}

.record-meta {
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
}

.record-item p {
  margin: 8px 0 0;
  color: var(--ink-2);
  line-height: 1.55;
}

.dashboard-group-list {
  display: grid;
  gap: 14px;
  padding: 14px;
}

.dashboard-group {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: #fbfdff;
}

.dashboard-group-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 11px 13px;
  background: #f8fafc;
  border-bottom: 1px solid var(--line-soft);
}

.dashboard-group-head span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.dashboard-group .record-list {
  padding: 12px;
}

.schedule-builder {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  margin-bottom: 16px;
}

.batch-panel {
  border-color: rgba(37, 99, 235, 0.22);
  background:
    linear-gradient(180deg, rgba(239, 246, 255, 0.86), rgba(255, 255, 255, 0.94) 120px),
    #fff;
}

.table-panel {
  overflow: hidden;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 60px;
  padding: 13px 16px;
  border-bottom: 1px solid var(--line-soft);
  background: linear-gradient(180deg, #fff, #fbfcfe);
}

.panel-head h3 {
  margin: 0;
  font-size: 16px;
  line-height: 1.2;
}

table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
}

th,
td {
  padding: 13px 16px;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
  vertical-align: middle;
  font-size: 14px;
}

th {
  color: var(--muted);
  background: #f8fafc;
  font-size: 12px;
  font-weight: 800;
}

.select-cell {
  width: 44px;
  text-align: center;
}

.table-sort {
  width: 100%;
  min-height: auto;
  border: 0;
  padding: 0;
  color: inherit;
  background: transparent;
  text-align: left;
  font-size: inherit;
  font-weight: inherit;
}

.table-sort:hover {
  color: var(--accent);
}

tbody tr {
  transition: background-color 0.16s ease;
}

tbody tr:hover {
  background: #fbfdff;
}

tr:last-child td {
  border-bottom: 0;
}

td strong {
  color: var(--ink);
}

.status {
  display: inline-flex;
  align-items: center;
  min-height: 25px;
  padding: 0 9px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 800;
  white-space: nowrap;
}

.status.done {
  color: var(--teal);
  background: var(--teal-soft);
  border: 1px solid #bbf7d0;
}

.status.pending {
  color: var(--amber);
  background: var(--amber-soft);
  border: 1px solid #fed7aa;
}

.status.info {
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid #bfdbfe;
}

.status.cancelled {
  color: #475569;
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
}

.form-panel {
  display: grid;
  gap: 12px;
  padding: 14px 16px;
  margin-bottom: 16px;
}

.form-panel .panel-head {
  min-height: auto;
  padding: 0 0 14px;
  margin-bottom: 2px;
  background: transparent;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 13px;
}

.timetable-form-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 13px;
}

.timetable-form-grid label {
  min-width: 0;
}

.paired-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 13px;
}

.reference-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
  gap: 8px;
  align-items: center;
}

.compact-form-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1fr 1fr 1fr;
  gap: 10px 12px;
  align-items: end;
}

label {
  display: grid;
  gap: 7px;
  color: var(--ink-2);
  font-size: 13px;
  font-weight: 750;
}

.weekday-group {
  display: grid;
  grid-template-columns: 1fr;
  gap: 7px;
}

.check-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-2);
  background: #fff;
  font-size: 12px;
  font-weight: 750;
}

.check-pill input {
  width: 14px;
  min-height: 14px;
  margin: 0;
  accent-color: var(--accent);
}

.lesson-mode {
  display: inline-flex;
  width: fit-content;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
}

.lesson-mode button {
  min-height: 34px;
  border: 0;
  border-radius: 7px;
  padding: 0 14px;
  color: var(--muted);
  background: transparent;
  font-weight: 800;
}

.lesson-mode button.active {
  color: #fff;
  background: var(--accent);
}

.hidden {
  display: none !important;
}

.form-hint {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

input,
select,
textarea {
  width: 100%;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 11px;
  color: var(--ink);
  background: #fff;
  box-shadow: inset 0 1px 0 rgba(16, 24, 40, 0.02);
}

input:hover,
select:hover,
textarea:hover {
  border-color: #b8c4d4;
}

textarea {
  resize: vertical;
  line-height: 1.55;
}

.empty {
  padding: 42px 16px;
  text-align: center;
  color: var(--muted);
  background: linear-gradient(180deg, #fff, #fbfcfe);
}

.summary-list {
  display: grid;
  gap: 10px;
  padding: 14px;
}

.summary-item {
  padding: 13px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: #fbfcfe;
  transition: border-color 0.16s ease, background-color 0.16s ease;
}

.summary-item:hover {
  border-color: #cbd5e1;
  background: #fff;
}

.summary-item strong {
  display: block;
  margin-bottom: 6px;
}

.summary-item p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.report-panel {
  overflow: hidden;
  border: 1px solid rgba(217, 225, 236, 0.94);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-soft);
}

.report-body {
  display: grid;
  gap: 16px;
  padding: 16px;
}

.report-section {
  display: grid;
  gap: 12px;
}

.report-section-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.report-section-head h4 {
  margin: 0;
  font-size: 16px;
}

.report-section-head span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.report-card-list {
  display: grid;
  gap: 12px;
}

.report-card {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: #fbfcfe;
}

.report-card.cancelled {
  background: #f8fafc;
}

.report-card-index {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: var(--accent);
  background: var(--accent-soft);
  font-weight: 850;
}

.report-card-title {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 12px;
}

.report-card-title strong {
  font-size: 15px;
}

.report-card-title p,
.report-grid p,
.report-note,
.pending-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.report-card-title p {
  margin-top: 4px;
  font-size: 13px;
}

.report-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.report-grid div,
.report-note,
.pending-item {
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  padding: 10px;
  background: #fff;
}

.report-grid span {
  display: block;
  margin-bottom: 5px;
  color: var(--ink-2);
  font-size: 12px;
  font-weight: 850;
}

.pending-list {
  display: grid;
  gap: 10px;
}

.pending-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.pending-item strong {
  display: block;
  margin-bottom: 4px;
}

.calendar-shell {
  border: 1px solid rgba(217, 225, 236, 0.94);
  border-radius: 8px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: var(--shadow-soft);
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
}

.calendar-day {
  min-height: 126px;
  padding: 9px;
  background: #fff;
}

.calendar-day.muted {
  background: #f8fafc;
}

.calendar-date {
  color: var(--ink-2);
  font-size: 12px;
  font-weight: 850;
  margin-bottom: 7px;
}

.calendar-slot-stack {
  display: grid;
  gap: 7px;
}

.calendar-slot-row {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 7px;
  align-items: stretch;
  min-height: 48px;
}

.calendar-slot-label {
  display: grid;
  place-items: center;
  min-height: 48px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  color: var(--ink-2);
  background: #f8fafc;
  font-size: 12px;
  font-weight: 900;
}

.calendar-slot-body {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.week-range {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink-2);
  background: #fff;
  font-weight: 800;
}

.calendar-lessons {
  display: grid;
  gap: 6px;
}

.calendar-lesson {
  display: grid;
  gap: 3px;
  width: 100%;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  padding: 7px;
  text-align: left;
  background: #fbfcfe;
}

.calendar-empty-slot {
  width: 100%;
  min-height: 48px;
  border: 1px dashed #cbd5e1;
  border-radius: 8px;
  background: #fbfcfe;
}

.calendar-empty-slot:hover {
  border-color: var(--accent);
  background: #eff6ff;
}

.calendar-lesson strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 12px;
}

.calendar-lesson span {
  color: var(--muted);
  font-size: 11px;
}

.calendar-lesson.done {
  border-color: #bbf7d0;
  background: #f0fdf4;
}

.calendar-lesson.cancelled {
  border-color: #cbd5e1;
  background: #f8fafc;
}

.calendar-lesson.pending {
  border-color: #fed7aa;
  background: #fff7ed;
}

.calendar-lesson.info {
  border-color: #bfdbfe;
  background: #eff6ff;
}

.modal {
  width: min(880px, calc(100vw - 28px));
  border: 0;
  padding: 0;
  background: transparent;
}

.modal::backdrop {
  background: rgba(15, 23, 42, 0.48);
  backdrop-filter: blur(3px);
}

.modal-card {
  display: grid;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
  background: #fff;
  box-shadow: var(--shadow);
}

.modal-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-soft);
}

.modal-actions {
  justify-content: flex-end;
  padding-top: 14px;
  border-top: 1px solid var(--line-soft);
}

.import-box {
  border: 1px dashed #aeb8c6;
  border-radius: 8px;
  padding: 18px;
  background:
    linear-gradient(90deg, rgba(37, 99, 235, 0.05), rgba(15, 118, 110, 0.05)),
    var(--panel-soft);
}

.import-box p {
  margin: 0 0 14px;
  color: var(--ink-2);
  line-height: 1.6;
}

.code-box {
  margin: 0;
  padding: 15px;
  overflow: auto;
  border: 1px solid #1f2937;
  border-radius: 8px;
  color: #e5e7eb;
  background: #111827;
  white-space: pre-wrap;
  font-size: 13px;
  line-height: 1.65;
}

@media (max-width: 1100px) {
  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .content-grid,
  .dashboard-control,
  .schedule-builder {
    grid-template-columns: 1fr;
  }

  .dashboard-summary-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    padding: 14px;
  }

  .brand {
    padding: 4px 4px 12px;
    margin-bottom: 10px;
  }

  .nav {
    display: flex;
    gap: 8px;
    padding-bottom: 2px;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .nav::-webkit-scrollbar {
    display: none;
  }

  .nav-item {
    flex: 0 0 auto;
    min-width: 116px;
  }

  .main {
    padding: 16px;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .timetable-form-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .compact-form-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .top-actions {
    display: flex;
    justify-content: stretch;
  }

  .top-actions button,
  .toolbar input,
  .dashboard-filter label {
    width: 100%;
  }

  .header-filter {
    grid-template-columns: 1fr;
  }

  .schedule-header-filter,
  .class-header-filter {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  body {
    background: var(--bg);
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .brand h1 {
    font-size: 17px;
  }

  .brand p,
  .eyebrow {
    font-size: 11px;
  }

  .nav-item {
    min-height: 40px;
    min-width: 104px;
    padding-left: 36px;
    font-size: 13px;
  }

  .nav {
    margin-left: -2px;
    margin-right: -2px;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .dashboard-summary-grid {
    grid-template-columns: 1fr;
  }

  .compact-form-grid {
    grid-template-columns: 1fr;
  }

  .reference-row {
    grid-template-columns: 1fr;
  }

  .paired-row {
    grid-template-columns: 1fr;
  }

  .segmented-control {
    display: grid;
    grid-template-columns: 1fr;
    width: 100%;
  }

  .schedule-header-filter,
  .class-header-filter {
    grid-template-columns: 1fr;
  }

  .dashboard-control,
  .form-panel,
  .table-panel,
  .report-panel,
  .topbar {
    border-radius: 8px;
  }

  .dashboard-control {
    padding: 13px;
  }

  .dashboard-summary-grid {
    gap: 10px;
  }

  .card {
    min-height: auto;
    padding: 15px;
  }

  .metric {
    font-size: 28px;
  }

  .lesson-mini-item {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .record-item {
    grid-template-columns: 1fr;
  }

  .row-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .class-row-actions {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .class-module-list {
    padding: 10px;
  }

  .class-module-head {
    align-items: stretch;
    flex-direction: column;
  }

  .row-actions button {
    width: 100%;
  }

  .row-select {
    width: 100%;
  }

  .panel-head {
    align-items: stretch;
    flex-direction: column;
  }

  .toolbar {
    width: 100%;
  }

  .primary-btn,
  .ghost-btn,
  .danger-btn,
  .icon-btn,
  input,
  select {
    min-height: 42px;
  }

  .table-panel {
    background: transparent;
    border: 0;
    box-shadow: none;
    overflow: visible;
  }

  .table-panel .panel-head {
    border: 1px solid rgba(217, 225, 236, 0.94);
    border-radius: 8px;
    margin-bottom: 10px;
    background: rgba(255, 255, 255, 0.94);
  }

  table,
  thead,
  tbody,
  tr,
  td {
    display: block;
    width: 100%;
  }

  thead {
    display: none;
  }

  tbody {
    display: grid;
    gap: 10px;
  }

  tr {
    padding: 10px 12px;
    border: 1px solid rgba(217, 225, 236, 0.94);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.94);
    box-shadow: var(--shadow-soft);
  }

  td {
    display: grid;
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 10px;
    align-items: start;
    padding: 9px 0;
    border-bottom: 1px solid var(--line-soft);
    font-size: 14px;
  }

  td:last-child {
    border-bottom: 0;
  }

  td::before {
    content: attr(data-label);
    color: var(--muted);
    font-size: 12px;
    font-weight: 800;
  }

  td.row-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  td.class-row-actions {
    display: flex;
  }

  td.row-actions::before {
    padding-top: 0;
  }

  td.row-actions button + button {
    margin-top: 8px;
  }

  .modal {
    width: 100vw;
    max-width: 100vw;
    height: 100dvh;
    max-height: 100dvh;
  }

  .modal-card {
    min-height: 100dvh;
    max-height: 100dvh;
    overflow-y: auto;
    border-radius: 0;
    padding: 15px;
  }

  .modal-actions {
    position: sticky;
    bottom: -15px;
    display: grid;
    grid-template-columns: 1fr;
    background: #fff;
  }

  .lesson-mode {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
  }

  .code-box {
    font-size: 12px;
    line-height: 1.55;
  }

  .calendar-grid {
    grid-template-columns: 1fr;
    gap: 10px;
    background: transparent;
  }

  .calendar-shell {
    border: 0;
    background: transparent;
    box-shadow: none;
  }

  .calendar-day {
    min-height: auto;
    border: 1px solid rgba(217, 225, 236, 0.94);
    border-radius: 8px;
  }

  .calendar-slot-row {
    grid-template-columns: 48px minmax(0, 1fr);
  }

  .calendar-day.muted:empty {
    display: none;
  }

  .report-body {
    padding: 12px;
  }

  .report-card {
    grid-template-columns: 1fr;
  }

  .report-card-title,
  .pending-item {
    align-items: stretch;
    flex-direction: column;
  }

  .report-grid {
    grid-template-columns: 1fr;
  }
}