:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #667085;
  --soft: #98a2b3;
  --paper: #ffffff;
  --canvas: #f5f7fb;
  --line: #e4e7ec;
  --line-strong: #d0d5dd;
  --navy: #16243d;
  --blue: #3b6eea;
  --blue-dark: #2854c5;
  --blue-soft: #edf3ff;
  --teal: #168576;
  --teal-soft: #e8f7f4;
  --amber: #d58b26;
  --amber-soft: #fff5e6;
  --danger: #c63c45;
  --danger-soft: #fff0f1;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 8px 24px rgba(16, 24, 40, 0.05);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background: var(--canvas);
}

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

button {
  cursor: pointer;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

.shell {
  width: min(1440px, calc(100% - 48px));
  margin: 0 auto;
  padding: 24px 0 64px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 62px;
  gap: 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 11px;
  color: #fff;
  background: var(--navy);
  font-size: 1.1rem;
  font-weight: 800;
  box-shadow: 0 5px 14px rgba(22, 36, 61, 0.18);
}

.brand div {
  display: grid;
  gap: 2px;
}

.brand strong {
  font-size: 0.98rem;
  letter-spacing: -0.01em;
}

.brand div span {
  color: var(--muted);
  font-size: 0.76rem;
}

.header-actions,
.auth-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.auth-controls {
  color: var(--muted);
  font-size: 0.8rem;
}

.storage-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 10px;
  border-radius: 8px;
  color: var(--muted);
  background: #eef1f6;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
}

.storage-status.connected .status-dot {
  background: #16a36a;
  box-shadow: 0 0 0 3px rgba(22, 163, 106, 0.12);
}

.storage-status.error .status-dot {
  background: var(--danger);
}

.auth-button {
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 7px 11px;
  color: var(--ink);
  background: var(--paper);
  font-size: 0.78rem;
  font-weight: 700;
  transition: border-color 150ms ease, color 150ms ease, background 150ms ease;
}

.auth-button:hover {
  border-color: var(--blue);
  color: var(--blue);
  background: var(--blue-soft);
}

.overview {
  display: grid;
  grid-template-columns: minmax(300px, 1fr) minmax(480px, 1.35fr);
  align-items: end;
  gap: 64px;
  padding: 54px 8px 38px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--blue);
  font-size: 0.69rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1 {
  max-width: 620px;
  margin-bottom: 16px;
  color: var(--navy);
  font-size: clamp(2.6rem, 5vw, 4.8rem);
  font-weight: 750;
  letter-spacing: -0.055em;
  line-height: 0.96;
}

h2 {
  margin-bottom: 0;
  color: var(--navy);
  font-size: 1.35rem;
  font-weight: 750;
  letter-spacing: -0.025em;
}

h3 {
  color: var(--navy);
}

.subtitle {
  max-width: 500px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.6;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.stats article {
  display: grid;
  gap: 5px;
  min-height: 112px;
  align-content: center;
  padding: 20px 24px;
}

.stats article + article {
  border-left: 1px solid var(--line);
}

.stats strong {
  color: var(--navy);
  font-size: 2rem;
  font-weight: 760;
  letter-spacing: -0.04em;
}

.stats span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.timetable-panel {
  padding: 0;
  overflow: hidden;
}

.panel-heading {
  margin-bottom: 22px;
}

.timetable-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 24px 18px;
}

.timetable-controls,
.week-controls {
  display: flex;
  align-items: end;
  gap: 9px;
}

.timetable-controls label {
  min-width: 180px;
}

.week-controls {
  padding-bottom: 1px;
}

.week-controls button {
  height: 38px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 0 12px;
  color: var(--ink);
  background: var(--paper);
  font-size: 0.78rem;
  font-weight: 700;
}

.week-controls button:hover {
  border-color: var(--blue);
  color: var(--blue);
  background: var(--blue-soft);
}

.week-label {
  margin: -8px 24px 16px;
  color: var(--muted);
  font-size: 0.8rem;
}

.timetable-wrap {
  overflow-x: auto;
  border-top: 1px solid var(--line);
}

.timetable {
  width: 100%;
  min-width: 960px;
  border-collapse: collapse;
  table-layout: fixed;
}

.timetable th,
.timetable td {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 7px;
  vertical-align: top;
}

.timetable tr > :last-child {
  border-right: 0;
}

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

.timetable th {
  height: 42px;
  color: var(--muted);
  background: #fafbfc;
  font-size: 0.72rem;
  font-weight: 700;
  text-align: left;
}

.timetable thead th:first-child {
  width: 67px;
}

.timetable td {
  height: 50px;
  background: var(--paper);
}

.time-label {
  color: var(--soft);
  background: #fafbfc !important;
  font-size: 0.68rem;
  font-weight: 700;
  white-space: nowrap;
}

.timetable-lesson {
  padding: 7px 8px;
  border-left: 3px solid var(--blue);
  border-radius: 6px;
  color: #294678;
  background: var(--blue-soft);
  font-size: 0.7rem;
  line-height: 1.35;
}

.timetable-lesson + .timetable-lesson {
  margin-top: 5px;
}

.timetable-break {
  border-left-color: var(--amber);
  color: #80541d;
  background: var(--amber-soft);
}

.timetable-lesson strong,
.timetable-lesson span {
  display: block;
}

.lesson-log-status {
  margin-top: 4px;
  color: var(--teal);
  font-weight: 800;
}

.log-lesson-button {
  margin-top: 6px;
  border: 1px solid rgba(59, 110, 234, 0.3);
  border-radius: 5px;
  padding: 3px 6px;
  color: var(--blue-dark);
  background: rgba(255, 255, 255, 0.7);
  font-size: 0.65rem;
  font-weight: 750;
}

.log-lesson-button + .log-lesson-button {
  margin-left: 3px;
}

.timetable-empty {
  margin: 24px;
  padding: 36px;
  border: 1px dashed var(--line-strong);
  border-radius: 10px;
  color: var(--muted);
  background: #fafbfc;
  text-align: center;
}

.section-switcher {
  display: flex;
  align-items: center;
  gap: 20px;
  margin: 10px 0 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.section-switcher > span {
  flex: 0 0 auto;
  color: var(--navy);
  font-size: 0.78rem;
  font-weight: 800;
}

.entity-nav {
  display: flex;
  gap: 2px;
  flex: 1;
  overflow-x: auto;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.entity-nav button {
  flex: 0 0 auto;
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 7px 7px 0 0;
  padding: 10px 13px 9px;
  color: var(--muted);
  background: transparent;
  font-size: 0.75rem;
  font-weight: 700;
}

.entity-nav button:hover {
  color: var(--ink);
}

.entity-nav button.active {
  border-bottom-color: var(--blue);
  color: var(--blue-dark);
  background: var(--blue-soft);
  box-shadow: none;
}

.sub-tabs {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  margin: 0 0 12px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #eef1f6;
}

.sub-tabs button {
  flex: 0 0 auto;
  border: 0;
  border-radius: 7px;
  padding: 8px 12px;
  color: var(--muted);
  background: transparent;
  font-size: 0.73rem;
  font-weight: 700;
}

.sub-tabs button.active {
  color: var(--navy);
  background: var(--paper);
  box-shadow: 0 1px 3px rgba(16, 24, 40, 0.12);
}

.workspace-grid {
  display: grid;
  grid-template-columns: minmax(320px, 0.78fr) minmax(480px, 1.22fr);
  align-items: start;
  gap: 14px;
}

.form-panel {
  position: sticky;
  top: 14px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 15px;
}

label {
  display: grid;
  gap: 7px;
  color: #344054;
  font-size: 0.75rem;
  font-weight: 700;
}

input,
textarea,
select {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  padding: 9px 11px;
  color: var(--ink);
  background: var(--paper);
  outline: none;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

input:hover,
textarea:hover,
select:hover {
  border-color: #aeb7c5;
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(59, 110, 234, 0.12);
}

textarea {
  resize: vertical;
}

.notes-field {
  grid-column: 1 / -1;
}

.form-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.form-message {
  margin: 0;
  color: var(--danger);
  font-size: 0.8rem;
}

.primary-button {
  flex: 0 0 auto;
  border: 0;
  border-radius: 8px;
  padding: 10px 16px;
  color: #fff;
  background: var(--blue);
  font-size: 0.8rem;
  font-weight: 750;
  box-shadow: 0 4px 10px rgba(59, 110, 234, 0.22);
  transition: background 150ms ease, transform 150ms ease;
}

.primary-button:hover {
  background: var(--blue-dark);
  transform: translateY(-1px);
}

.primary-button:disabled {
  cursor: wait;
  opacity: 0.65;
  transform: none;
}

.lesson-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
}

.filters {
  display: flex;
  gap: 2px;
  padding: 3px;
  border-radius: 8px;
  background: #eef1f6;
}

.filter {
  border: 0;
  border-radius: 6px;
  padding: 6px 9px;
  color: var(--muted);
  background: transparent;
  font-size: 0.7rem;
  font-weight: 700;
}

.filter.active {
  color: var(--blue-dark);
  background: var(--paper);
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.1);
}

.lesson-list {
  display: grid;
  gap: 9px;
}

.lesson-card,
.record-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 15px;
  background: var(--paper);
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.lesson-card:hover,
.record-card:hover {
  border-color: #cbd2dc;
  box-shadow: 0 4px 12px rgba(16, 24, 40, 0.05);
}

.lesson-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: start;
  gap: 13px;
}

.record-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
}

.record-card h3 {
  margin-bottom: 6px;
  font-size: 0.98rem;
}

.record-card p {
  margin-bottom: 3px;
  color: var(--muted);
  font-size: 0.82rem;
}

.complete-button {
  display: grid;
  width: 25px;
  height: 25px;
  place-items: center;
  border: 1.5px solid var(--line-strong);
  border-radius: 50%;
  color: transparent;
  background: transparent;
  font-size: 0.75rem;
  font-weight: 900;
}

.lesson-card.complete .complete-button {
  border-color: var(--teal);
  color: #fff;
  background: var(--teal);
}

.lesson-card.complete .title {
  color: var(--muted);
  text-decoration: line-through;
}

.lesson-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.7rem;
}

.subject {
  padding: 3px 7px;
  border-radius: 5px;
  color: var(--blue-dark);
  background: var(--blue-soft);
  font-weight: 750;
}

.title {
  margin-bottom: 4px;
  font-size: 0.98rem;
}

.student,
.notes {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.notes {
  margin-top: 7px;
}

.delete-button {
  border: 0;
  padding: 5px;
  color: var(--soft);
  background: transparent;
  font-size: 0.7rem;
  font-weight: 700;
}

.delete-button:hover {
  color: var(--danger);
}

.flex-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 9px;
  margin-bottom: 12px;
}

.flex-balance {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: #fafbfc;
}

.flex-balance strong,
.flex-balance span {
  display: block;
}

.flex-balance span {
  color: var(--muted);
  font-size: 0.75rem;
}

.flex-balance strong {
  margin-top: 4px;
  color: var(--teal);
  font-size: 1.2rem;
  font-weight: 750;
}

.flex-credit {
  color: var(--teal) !important;
  font-weight: 750;
}

.flex-debit {
  color: var(--danger) !important;
  font-weight: 750;
}

.empty-state {
  padding: 48px 20px;
  text-align: center;
  color: var(--muted);
}

.empty-state > span {
  display: grid;
  width: 42px;
  height: 42px;
  margin: 0 auto 13px;
  place-items: center;
  border-radius: 11px;
  color: var(--teal);
  background: var(--teal-soft);
  font-weight: 900;
}

.empty-state h3 {
  margin-bottom: 5px;
  font-size: 0.95rem;
}

.empty-state p {
  margin-bottom: 0;
  font-size: 0.8rem;
}

dialog {
  width: min(440px, calc(100% - 28px));
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0;
  color: var(--ink);
  background: var(--paper);
  box-shadow: 0 24px 60px rgba(16, 24, 40, 0.2);
}

dialog::backdrop {
  background: rgba(22, 36, 61, 0.52);
  backdrop-filter: blur(3px);
}

#password-form {
  display: grid;
  gap: 15px;
  padding: 24px;
}

.dialog-heading {
  display: flex;
  align-items: start;
  justify-content: space-between;
}

.dialog-close {
  border: 0;
  padding: 0 4px;
  color: var(--muted);
  background: transparent;
  font-size: 1.6rem;
}

.password-help {
  margin: -4px 0 0;
  color: var(--muted);
  font-size: 0.76rem;
}

@media (max-width: 1050px) {
  .overview {
    grid-template-columns: 1fr;
    gap: 28px;
  }

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

  .form-panel {
    position: static;
  }
}

@media (max-width: 720px) {
  .shell {
    width: min(100% - 24px, 1440px);
    padding-top: 14px;
  }

  .topbar,
  .header-actions,
  .timetable-heading,
  .timetable-controls,
  .lesson-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .topbar {
    gap: 16px;
  }

  .header-actions {
    width: 100%;
  }

  .auth-controls {
    width: 100%;
    flex-wrap: wrap;
  }

  .overview {
    padding: 36px 0 28px;
  }

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

  .stats article {
    min-height: auto;
    padding: 16px 20px;
  }

  .stats article + article {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .timetable-heading,
  .timetable-controls {
    width: 100%;
  }

  .timetable-controls label {
    width: 100%;
  }

  .section-switcher {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .entity-nav {
    width: 100%;
  }

  .panel {
    padding: 18px;
  }

  .timetable-panel {
    padding: 0;
  }

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

  .notes-field {
    grid-column: auto;
  }

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

  .delete-button {
    grid-column: 2;
    justify-self: start;
    padding-left: 0;
  }
}