:root {
  --bg: #f4f1e8;
  --bg-soft: #e8f2f2;
  --panel: #fffdf8;
  --ink: #13233a;
  --ink-soft: #4b5972;
  --line: #d1d9e6;
  --accent: #0f766e;
  --accent-2: #f25f4c;
  --danger: #c1121f;
  --shadow: 0 18px 40px rgba(19, 35, 58, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans TC", sans-serif;
  color: var(--ink);
  min-height: 100vh;
  background:
    radial-gradient(circle at 8% 12%, #d9f4f2 0%, transparent 36%),
    radial-gradient(circle at 90% 8%, #ffe6cf 0%, transparent 34%),
    linear-gradient(160deg, var(--bg) 0%, var(--bg-soft) 100%);
}

.bg-grid {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(19, 35, 58, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(19, 35, 58, 0.03) 1px, transparent 1px);
  background-size: 28px 28px;
  z-index: -3;
}

.blob {
  position: fixed;
  border-radius: 999px;
  filter: blur(22px);
  pointer-events: none;
  z-index: -2;
}

.blob-a {
  width: 360px;
  height: 360px;
  top: -120px;
  right: -100px;
  background: rgba(15, 118, 110, 0.2);
}

.blob-b {
  width: 300px;
  height: 300px;
  bottom: -100px;
  left: -60px;
  background: rgba(242, 95, 76, 0.2);
}

.app-shell {
  width: min(1180px, 92%);
  margin: 24px auto 56px;
  display: grid;
  gap: 18px;
}

.auth-shell {
  width: min(460px, 92%);
  margin: 72px auto;
}

.auth-card {
  background: color-mix(in srgb, var(--panel) 88%, white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  border-radius: 20px;
  padding: 26px;
  animation: riseIn 500ms ease-out;
}

.auth-form {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.role-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 12px;
}

.role-btn {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  background: #fff;
  color: var(--ink);
  font-weight: 700;
  cursor: pointer;
  transition: transform 160ms ease, background-color 160ms ease;
}

.role-btn:hover {
  transform: translateY(-1px);
}

.role-btn.active {
  background: color-mix(in srgb, var(--accent) 16%, white);
  border-color: var(--accent);
}

.auth-form .btn {
  margin-top: 6px;
}

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

.captcha-text {
  margin: 0;
  min-width: 112px;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px dashed var(--line);
  background: color-mix(in srgb, var(--accent) 9%, white);
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.08rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-align: center;
}

.captcha-refresh {
  padding: 8px 12px;
}

.auth-hint {
  margin: 14px 0 0;
  color: var(--ink-soft);
  font-size: 0.88rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 12px;
  cursor: pointer;
}
.auth-hint summary {
  font-weight: 600;
  color: var(--ink);
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 6px;
}
.auth-hint summary::before { content: "▶"; font-size: 0.7rem; transition: transform .2s; }
.auth-hint[open] summary::before { transform: rotate(90deg); }
.hint-body { margin-top: 10px; }
.hint-group-title { font-weight: 600; color: var(--ink); margin: 4px 0; }
.hint-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
}
.hint-table th, .hint-table td {
  border: 1px solid var(--line);
  padding: 4px 8px;
  text-align: left;
}
.hint-table th { background: var(--bg-soft); font-weight: 600; }

.hero,
.panel {
  background: color-mix(in srgb, var(--panel) 86%, white);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  border-radius: 20px;
  padding: 20px 24px;
}

.hero {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  animation: riseIn 500ms ease-out;
}

.eyebrow {
  margin: 0;
  font-family: "Space Grotesk", sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.88rem;
}

h1,
h2 {
  margin: 6px 0 8px;
}

h1 {
  font-size: clamp(1.5rem, 2.4vw, 2.2rem);
  font-weight: 900;
}

h2 {
  font-size: 1.24rem;
}

.subtitle,
#hintText {
  color: var(--ink-soft);
  margin: 0;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
}

.teacher-portal {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 14px;
}

.student-portal {
  display: grid;
  gap: 12px;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.dash-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  padding: 10px;
}

.dash-card .label {
  margin: 0;
  color: var(--ink-soft);
}

.dash-card .value {
  margin: 6px 0 0;
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
}

.credit-progress-wrap {
  margin-top: 10px;
}

.credit-progress-wrap p {
  margin: 0 0 6px;
}

.credit-track {
  width: 100%;
  height: 14px;
  background: #f2f5f9;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
}

.credit-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #0f766e 0%, #1f9b8f 100%);
}

.student-filter-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 10px;
}

.student-timetable {
  display: grid;
  grid-template-columns: 76px repeat(5, minmax(110px, 1fr));
  gap: 5px;
  overflow-x: auto;
}

.student-slot {
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 46px;
  background: #fff;
  padding: 6px;
}

.student-slot.head {
  font-weight: 700;
  text-align: center;
  background: color-mix(in srgb, var(--accent) 12%, white);
}

.student-slot.time {
  text-align: center;
  font-weight: 700;
  font-family: "Space Grotesk", sans-serif;
}

.student-chip {
  font-size: 0.8rem;
  border-left: 4px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 11%, white);
  border-radius: 6px;
  padding: 4px;
}

.teacher-sidebar,
.teacher-main {
  background: color-mix(in srgb, var(--panel) 86%, white);
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 14px;
}

.tree-nav {
  display: grid;
  gap: 7px;
}

.tree-item {
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px 10px;
  background: #fff;
  font-weight: 700;
  cursor: pointer;
}

.tree-item.active {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, white);
}

.tree-item:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.warning-text {
  margin: 0 0 10px;
  color: #b80f1f;
  font-weight: 700;
}

.warning-text.error {
  color: #b80f1f;
}

.phase-panel {
  margin-bottom: 12px;
}

.excel-form {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.sheet-note {
  color: var(--ink-soft);
  margin: 0;
}

.sheet-note.error {
  color: #b80f1f;
  font-weight: 700;
}

.block-grid {
  display: grid;
  grid-template-columns: 82px repeat(5, minmax(84px, 1fr));
  gap: 5px;
}

.block-cell {
  border: 1px solid var(--line);
  border-radius: 8px;
  min-height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
}

.block-cell.head,
.block-cell.row-head {
  font-weight: 700;
  background: color-mix(in srgb, var(--accent) 11%, white);
}

.block-cell.slot {
  cursor: pointer;
}

.block-cell.slot.blocked {
  background: color-mix(in srgb, var(--danger) 16%, white);
  border-color: var(--danger);
  color: #5c0f16;
  font-weight: 700;
}

.excel-table th,
.excel-table td {
  padding: 8px;
  border: 1px solid var(--line);
}

.excel-table input {
  width: 100%;
}

.week-topic-input {
  min-width: 320px;
}

.capability-box {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.formula-box {
  margin: 0;
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 9px 10px;
  background: #fbfbfb;
  font-family: "Space Grotesk", sans-serif;
}

.monitor-top {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.avatar-chip {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--accent) 18%, white);
  font-weight: 700;
}

.auth-code-row {
  grid-column: 1 / -1;
  display: flex;
  gap: 10px;
  align-items: center;
}

.teacher-config-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.teacher-form {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 14px;
  display: grid;
  gap: 10px;
}

.teacher-form h3 {
  margin: 2px 0 6px;
}

.full-width {
  grid-column: 1 / -1;
}

textarea {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  font: inherit;
  color: var(--ink);
  background: #fff;
  resize: vertical;
}

textarea:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 50%, white);
  border-color: var(--accent);
}

.check-field {
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

.check-field input {
  width: 16px;
  height: 16px;
}

.stat-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
  animation: riseIn 620ms ease-out;
}

.stat-card .label {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.86rem;
}

.stat-card .value {
  margin: 6px 0 0;
  font-size: 1.58rem;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.92rem;
  font-weight: 600;
}

input,
select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  font: inherit;
  color: var(--ink);
  background: #fff;
}

input:focus,
select:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 50%, white);
  border-color: var(--accent);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 8px;
  grid-column: 1 / -1;
  margin-top: 6px;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 10px 16px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 160ms ease, opacity 160ms ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-ghost {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.file-like {
  display: inline-flex;
  align-items: center;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  white-space: nowrap;
}

thead th {
  color: var(--ink-soft);
  font-weight: 600;
}

.row-actions {
  display: flex;
  gap: 6px;
}

.timetable {
  display: grid;
  grid-template-columns: 76px repeat(5, minmax(130px, 1fr));
  gap: 6px;
  overflow-x: auto;
}

.cell {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  min-height: 50px;
  padding: 8px;
}

.cell.head {
  text-align: center;
  font-weight: 700;
  background: color-mix(in srgb, var(--accent) 12%, white);
}

.cell.time {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  text-align: center;
}

.course-chip {
  border-left: 4px solid var(--accent);
  background: color-mix(in srgb, var(--accent) 11%, white);
  padding: 6px;
  border-radius: 8px;
  font-size: 0.82rem;
  margin-bottom: 6px;
}

.course-chip strong {
  display: block;
}

@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 960px) {
  .form-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .teacher-portal {
    grid-template-columns: 1fr;
  }

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

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

  .monitor-top {
    grid-template-columns: 1fr;
  }

  .teacher-config-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .app-shell {
    width: min(96%, 640px);
  }

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