:root {
  --ink: #1e3a5f;
  --muted: #536579;
  --brand: #0f766e;
  --brand-dark: #056357;
  --mint: #e8f7f1;
  --surface: #fff;
  --bg: #f8fafc;
  --line: #e2e8f0;
  --danger: #a63837;
  --warn: #86540c;
  --shadow: 0 12px 38px #234b3a0d;
  font-family:
    Pretendard, "Malgun Gothic", "Apple SD Gothic Neo", system-ui, sans-serif;
  font-size: 16px;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
  font-synthesis: none;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
}
button,
input,
select,
textarea {
  font: inherit;
}
button,
a,
input,
select,
textarea {
  -webkit-tap-highlight-color: transparent;
}
button {
  cursor: pointer;
}
button,
input,
select {
  min-height: 44px;
}
button {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  padding: 9px 15px;
  font-weight: 650;
}
button:hover {
  background: #eef7f2;
  border-color: #a4c8bd;
}
button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}
button.primary {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}
button.primary:hover {
  background: var(--brand-dark);
}
button.danger {
  color: var(--danger);
}
button.subtle {
  background: transparent;
  border-color: transparent;
}
button.small {
  font-size: 14px;
  padding: 7px 11px;
}
input,
select,
textarea {
  width: 100%;
  background: #fff;
  border: 1px solid #adc6bc;
  border-radius: 9px;
  padding: 10px 12px;
  color: var(--ink);
}
input[type="checkbox"],
input[type="radio"] {
  width: 20px;
  min-height: 20px;
  height: 20px;
  accent-color: var(--brand);
}
textarea {
  resize: vertical;
  min-height: 100px;
}
label {
  display: block;
  font-size: 14px;
  font-weight: 650;
}
label input,
label select,
label textarea {
  margin-top: 6px;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid #137a9c;
  outline-offset: 3px;
}
h1,
h2,
h3,
p {
  margin: 0;
}
h1 {
  font-size: 23px;
  letter-spacing: -0.8px;
}
h2 {
  font-size: 21px;
  letter-spacing: -0.5px;
}
h3 {
  font-size: 17px;
}
a {
  color: var(--brand-dark);
}
.skip-link {
  position: fixed;
  top: -70px;
  left: 15px;
  z-index: 200;
  background: #fff;
  padding: 10px;
}
.skip-link:focus {
  top: 10px;
}
.shell {
  width: min(1360px, 100%);
  margin: auto;
  padding: 0 32px 48px;
}
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  padding: 27px 0 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-mark {
  width: 43px;
  height: 43px;
  background: var(--brand);
  color: #fff;
  display: grid;
  place-items: center;
  border-radius: 14px;
  font-size: 24px;
  font-weight: 800;
}
.eyebrow {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
}
.muted {
  color: var(--muted);
  font-size: 14px;
}
.lead {
  font-size: 14px;
  color: var(--muted);
  margin-top: 4px;
}
.toolbar {
  display: flex;
  gap: 9px;
  align-items: center;
  flex-wrap: wrap;
}
.nav {
  display: flex;
  gap: 7px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
  padding-bottom: 12px;
}
.nav button {
  background: transparent;
  border-color: transparent;
  min-width: 96px;
  color: var(--muted);
}
.nav button[aria-current="page"] {
  background: var(--mint);
  color: var(--brand-dark);
}
.notice {
  padding: 13px 17px;
  background: #edf5f1;
  border: 1px solid var(--line);
  border-radius: 12px;
  font-size: 14px;
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  margin: 0 0 20px;
}
.notice.warning {
  background: #fff8e8;
  border-color: #e9d5ac;
  color: #6d4b12;
}
.notice.error {
  background: #fff1ef;
  border-color: #e6b1aa;
  color: var(--danger);
}
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
  padding: 23px;
  min-width: 0;
}
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}
.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}
.summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 22px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 15px;
}
.summary strong {
  font-size: 27px;
  line-height: 1.1;
}
.summary .eyebrow {
  font-size: 14px;
  margin-bottom: 4px;
}
.summary .accent {
  color: var(--brand-dark);
}
.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(330px, 0.9fr);
  gap: 21px;
  align-items: start;
}
.calendar-head {
  display: flex;
  gap: 10px;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}
.month-nav {
  display: flex;
  gap: 7px;
  align-items: center;
}
.month-nav button {
  padding: 7px 12px;
}
.weekday,
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 5px;
}
.weekday {
  margin-bottom: 8px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}
.weekday span:first-child {
  color: var(--danger);
}
.weekday span:last-child {
  color: #2c6991;
}
.day-cell {
  min-height: 100px;
  padding: 8px 6px;
  display: flex;
  align-items: flex-start;
  flex-direction: column;
  gap: 4px;
  background: #fff;
  border-color: transparent;
  border-radius: 11px;
  overflow: hidden;
  text-align: left;
  min-width: 0;
}
.day-cell:hover {
  background: #f1f8f4;
}
.day-cell[aria-pressed="true"] {
  border: 2px solid var(--brand);
  background: var(--mint);
  padding: 7px 5px;
}
.day-cell.today .day-number {
  background: var(--brand);
  color: white;
}
.day-number {
  width: 27px;
  height: 27px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 14px;
}
.day-cell.sunday .day-number {
  color: var(--danger);
}
.day-cell.saturday .day-number {
  color: #2c6991;
}
.day-cell.today .day-number {
  color: #fff;
}
.day-chip {
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
  border-left: 3px solid var(--chip, #087f72);
  padding-left: 4px;
  font-weight: 500;
}
.day-count {
  font-size: 12px;
  color: var(--muted);
  font-weight: 500;
}
.day-empty {
  min-height: 100px;
}
.calendar-foot {
  border-top: 1px solid var(--line);
  padding-top: 15px;
  margin-top: 14px;
  font-size: 13px;
  color: var(--muted);
}
.record-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.record-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: #fff;
}
.record-card .heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 9px;
}
.student-link {
  border: 0;
  background: none;
  padding: 0;
  min-height: 30px;
  font-size: 16px;
  text-align: left;
}
.type-badge {
  background: #eef5f2;
  border-radius: 7px;
  color: var(--badge, #087f72);
  padding: 4px 8px;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}
.date-line {
  font-size: 14px;
  color: var(--muted);
  margin: 6px 0;
}
.memo {
  font-size: 14px;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  margin: 8px 0;
}
.doc-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 12px;
}
.doc-button {
  min-height: 38px;
  font-size: 13px;
  padding: 6px 9px;
  background: #f5f7f6;
  font-weight: 600;
}
.doc-button.done {
  background: var(--mint);
  border-color: #a5d4c4;
  color: var(--brand-dark);
}
.doc-button.overdue {
  background: #fff1e9;
  color: #9a4e18;
  border-color: #e5bc9a;
}
.record-actions {
  border-top: 1px solid #edf2ef;
  margin-top: 12px;
  padding-top: 8px;
  display: flex;
  justify-content: flex-end;
  gap: 5px;
}
.empty {
  padding: 40px 18px;
  text-align: center;
  color: var(--muted);
  font-size: 15px;
  background: #f8fbf9;
  border-radius: 12px;
}
.empty strong {
  display: block;
  color: var(--ink);
  margin-bottom: 7px;
}
.section-gap {
  margin-top: 22px;
}
.filter-bar {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 12px;
  margin: 16px 0;
}
.period-row {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  flex-wrap: wrap;
  padding: 15px;
  background: #f5f9f7;
  border-radius: 12px;
}
.period-row label {
  min-width: 150px;
  flex: 1;
}
.period-caption {
  margin: 13px 0;
  font-size: 14px;
  color: var(--muted);
}
.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 11px;
  margin: 18px 0;
}
.metric {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  background: #fff;
}
.metric b {
  display: block;
  font-size: 27px;
  margin: 3px 0;
  color: var(--brand-dark);
}
.metric span {
  font-size: 14px;
  color: var(--muted);
}
.metric[aria-pressed="true"] {
  border-color: var(--brand);
  background: var(--mint);
}
.table-wrap {
  overflow-x: auto;
}
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 14px;
}
th,
td {
  text-align: left;
  padding: 13px 12px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  white-space: nowrap;
}
th {
  color: var(--muted);
  background: #f7faf8;
  font-weight: 650;
}
td:last-child {
  white-space: normal;
}
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.stack {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.full {
  grid-column: 1/-1;
}
.field-note {
  font-size: 13px;
  color: var(--muted);
  font-weight: 400;
  margin-top: 6px;
}
.check-label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
}
.check-label input {
  margin: 0;
}
.student-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 18px;
}
.student-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.student-card .student-link {
  font-weight: 750;
}
.dialog {
  border: none;
  padding: 0;
  border-radius: 14px;
  box-shadow: 0 24px 80px #153e3a35;
  width: min(680px, calc(100% - 32px));
  max-height: 90vh;
  color: var(--ink);
  background: #fff;
}
.dialog::backdrop {
  background: #183a355c;
  backdrop-filter: blur(2px);
}
.dialog.side-dialog {
  margin: 18px 18px 18px auto;
  height: calc(100dvh - 36px);
  max-height: calc(100dvh - 36px);
  width: min(530px, calc(100% - 36px));
}
.dialog-inner {
  padding: 25px;
}
.dialog-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 20px;
}
.dialog-body {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.dialog-footer {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  padding-top: 22px;
}
.dialog-footer button {
  min-width: 95px;
}
.dialog .notice {
  margin-bottom: 0;
}
.restore-counts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.restore-counts div {
  background: var(--mint);
  padding: 15px;
  border-radius: 10px;
  font-size: 14px;
}
.restore-counts b {
  font-size: 24px;
  display: block;
}
.conflict-list {
  font-size: 14px;
  padding-left: 20px;
  color: var(--warn);
  max-height: 160px;
  overflow: auto;
}
.inline-form {
  display: flex;
  align-items: flex-end;
  gap: 12px;
}
.inline-form label {
  flex: 1;
}
.backup-line {
  font-size: 14px;
  line-height: 1.9;
}
.text-break {
  overflow-wrap: anywhere;
}
#toast {
  position: fixed;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  max-width: min(650px, 90vw);
  background: #173e3a;
  color: #fff;
  padding: 14px 22px;
  border-radius: 12px;
  box-shadow: var(--shadow);
  z-index: 500;
  font-size: 14px;
}
#toast.error {
  background: #8a312e;
}
[hidden] {
  display: none !important;
}
.view-header {
  display: flex;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}
.backup-hint {
  font-size: 13px;
  color: var(--muted);
  max-width: 360px;
}
.legend {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--muted);
}
.legend span:before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--chip);
  border-radius: 50%;
  margin-right: 5px;
}
.help-box {
  padding: 15px;
  border-radius: 12px;
  background: #f3f8f5;
  font-size: 14px;
  color: var(--muted);
}
.settings-title {
  margin-bottom: 8px;
}
.screen-reader-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}
@media (min-width: 1100px) {
  .day-cell {
    min-height: 111px;
  }
  .day-empty {
    min-height: 111px;
  }
}
@media (max-width: 1000px) {
  .workspace {
    grid-template-columns: minmax(0, 1.15fr) minmax(300px, 1fr);
  }
  .shell {
    padding: 0 20px 36px;
  }
  .panel {
    padding: 18px;
  }
  .day-cell {
    min-height: 85px;
  }
  .day-chip {
    font-size: 11px;
  }
  .student-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 760px) {
  .dialog.side-dialog {
    max-width: none;
  }
  .shell {
    padding: 0 14px 24px;
  }
  .app-header {
    padding: 20px 0 14px;
    align-items: flex-start;
  }
  .app-header > .toolbar {
    flex-wrap: nowrap;
  }
  .app-header > .toolbar button {
    font-size: 14px;
    padding: 8px 11px;
  }
  .brand-mark {
    width: 37px;
    height: 37px;
    font-size: 21px;
  }
  .brand {
    gap: 9px;
  }
  h1 {
    font-size: 20px;
  }
  .brand .eyebrow {
    font-size: 12px;
  }
  .header-backup {
    display: none;
  }
  .nav {
    gap: 2px;
    margin-bottom: 16px;
  }
  .nav button {
    min-width: 0;
    flex: 1;
    padding: 8px 6px;
    font-size: 14px;
  }
  .workspace,
  .two-col {
    grid-template-columns: 1fr;
  }
  .summary-grid {
    gap: 9px;
    margin-bottom: 14px;
  }
  .summary {
    padding: 14px;
  }
  .summary strong {
    font-size: 23px;
  }
  .summary .eyebrow {
    font-size: 13px;
  }
  .summary .muted {
    font-size: 13px;
  }
  .panel {
    padding: 16px;
    border-radius: 15px;
  }
  .calendar-head h2 {
    font-size: 20px;
  }
  .month-nav {
    gap: 4px;
  }
  .month-nav button {
    padding: 7px 10px;
  }
  .calendar-grid,
  .weekday {
    gap: 3px;
  }
  .day-cell {
    min-height: 62px;
    padding: 4px 2px;
    align-items: center;
  }
  .day-cell[aria-pressed="true"] {
    padding: 3px 1px;
  }
  .day-chip {
    display: none;
  }
  .day-empty {
    min-height: 62px;
  }
  .day-count {
    font-size: 11px;
  }
  .filter-bar {
    grid-template-columns: 1fr 1fr;
  }
  .filter-bar label:first-child {
    grid-column: 1/-1;
  }
  .metric-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .metric {
    padding: 12px;
  }
  .metric b {
    font-size: 24px;
  }
  .period-row label {
    min-width: 125px;
  }
  .student-grid {
    grid-template-columns: 1fr 1fr;
  }
  .dialog.side-dialog {
    margin: 0;
    width: 100%;
    height: 100dvh;
    max-height: 100dvh;
    border-radius: 0;
  }
  .dialog-inner {
    padding: 20px;
  }
  .form-grid {
    gap: 13px;
  }
  .view-header {
    align-items: flex-start;
  }
  .notice {
    align-items: flex-start;
    font-size: 13px;
  }
  .inline-form {
    flex-wrap: wrap;
  }
  .inline-form label {
    min-width: 100px;
  }
  .inline-form button {
    width: 100%;
  }
  .backup-hint {
    max-width: none;
  }
  .table-wrap {
    margin: 0 -7px;
  }
  .student-card {
    padding: 12px;
  }
}
@media (prefers-reduced-motion: no-preference) {
  button {
    transition:
      background 0.14s,
      border-color 0.14s;
  }
  .dialog[open] {
    animation: appear 0.15s ease-out;
  }
  @keyframes appear {
    from {
      opacity: 0.5;
      transform: translateY(8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}
/* Every secondary label stays readable and every interactive target stays touch-friendly. */
.day-chip,
.day-count,
.brand .eyebrow {
  font-size: 13px;
}
.doc-button,
.student-link {
  min-height: 44px;
}
.day-chip {
  line-height: 1.4;
}
summary {
  cursor: pointer;
  min-height: 44px;
  padding: 10px 0;
  font-weight: 650;
  color: var(--brand-dark);
}
summary:focus-visible {
  outline: 3px solid #137a9c;
  outline-offset: 3px;
}
.student-grid > .empty {
  grid-column: 1/-1;
}
.app-header > .toolbar,
.month-nav {
  flex-shrink: 0;
}
.app-header > .toolbar button,
.month-nav button,
.summary strong {
  white-space: nowrap;
}
.brand {
  min-width: 0;
}
@media (max-width: 760px) {
  .summary {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }
  .summary .subtle {
    padding: 0;
    text-align: left;
  }
}
html:has(dialog[open]) {
  overflow: hidden;
}