:root {
  --font-sans: "Noto Sans TC", sans-serif;
  --font-serif: "Noto Serif TC", serif;

  --color-canvas: #efe6d8;
  --color-canvas-deep: #dfd0bb;
  --color-panel: rgba(255, 249, 242, 0.84);
  --color-panel-strong: #fffaf3;
  --color-panel-muted: rgba(248, 241, 232, 0.94);
  --color-ink: #241b14;
  --color-ink-soft: #695a4c;
  --color-line: rgba(78, 56, 39, 0.14);
  --color-line-strong: rgba(78, 56, 39, 0.22);
  --color-accent: #814a2b;
  --color-accent-deep: #5f331d;
  --color-accent-soft: rgba(129, 74, 43, 0.12);
  --color-occupied: #8f5530;
  --color-occupied-soft: rgba(143, 85, 48, 0.13);
  --color-empty: #285d4d;
  --color-empty-soft: rgba(40, 93, 77, 0.13);
  --color-chip: rgba(255, 252, 247, 0.88);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-7: 2rem;
  --space-8: 2.5rem;
  --space-9: 3rem;

  --radius-sm: 0.75rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;
  --radius-pill: 999px;

  --shadow-card: 0 1.5rem 3.75rem rgba(59, 35, 18, 0.14);
  --shadow-soft: 0 1rem 2rem rgba(59, 35, 18, 0.08);
  --transition-fast: 160ms ease;
  --transition-base: 220ms ease;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: light;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  color: var(--color-ink);
  background:
    radial-gradient(circle at top left, rgba(180, 116, 68, 0.22), transparent 30%),
    radial-gradient(circle at 84% 12%, rgba(90, 119, 106, 0.14), transparent 22%),
    linear-gradient(180deg, var(--color-canvas) 0%, var(--color-canvas-deep) 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 1.5rem 1.5rem;
  mask-image: radial-gradient(circle at center, black, transparent 84%);
}

button,
input {
  font: inherit;
}

code {
  padding: 0 var(--space-2);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.56);
  color: var(--color-accent-deep);
}

.page-shell {
  width: min(74rem, calc(100% - 2rem));
  margin: 0 auto;
  padding: var(--space-7) 0 var(--space-9);
}

.site-credit {
  margin-top: var(--space-7);
  padding: 0 var(--space-2);
  color: var(--color-ink-soft);
  text-align: center;
}

.site-credit p {
  margin: 0;
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-line-strong);
  font-size: 0.95rem;
  line-height: 1.8;
}

.site-credit a {
  color: var(--color-accent-deep);
  text-decoration-color: rgba(95, 51, 29, 0.35);
  text-underline-offset: 0.18em;
}

.site-credit a:hover,
.site-credit a:focus-visible {
  text-decoration-color: currentColor;
}

.hero,
.content-grid,
.meta-strip,
.summary-grid,
.chip-row {
  display: grid;
  gap: var(--space-6);
}

.hero {
  grid-template-columns: minmax(0, 1.2fr) minmax(20rem, 0.88fr);
  align-items: stretch;
  margin-bottom: var(--space-6);
}

.content-grid {
  grid-template-columns: minmax(0, 0.84fr) minmax(0, 1.16fr);
}

.panel {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-xl);
  background: var(--color-panel);
  backdrop-filter: blur(1.125rem);
  box-shadow: var(--shadow-card);
  padding: var(--space-8);
  animation: fade-up 520ms var(--transition-base) both;
}

.panel::after {
  content: "";
  position: absolute;
  inset: auto -10% -35% auto;
  width: 15rem;
  height: 15rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(129, 74, 43, 0.16), transparent 70%);
}

.hero-copy {
  display: grid;
  align-content: space-between;
  min-height: 30rem;
}

.lookup-panel {
  display: grid;
  align-content: start;
  gap: var(--space-5);
}

.eyebrow {
  position: relative;
  z-index: 1;
  margin: 0;
  color: var(--color-accent-deep);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

h1,
h2,
h3,
strong {
  position: relative;
  z-index: 1;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
}

h1 {
  max-width: 15ch;
  font-size: clamp(2.6rem, 5vw, 4rem);
  line-height: 1.04;
}

h2 {
  font-size: clamp(1.7rem, 2.8vw, 2.2rem);
}

.hero-text,
.section-text,
.field-note,
.status-banner,
.result-count,
.meta-card span,
.summary-card span,
.empty-state p,
.course-meta,
.cell-empty {
  position: relative;
  z-index: 1;
  color: var(--color-ink-soft);
}

.hero-text,
.section-text,
.field-note,
.empty-state p {
  margin: 0;
  line-height: 1.8;
}

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

.meta-card,
.summary-card {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-2);
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(78, 56, 39, 0.08);
  background: rgba(255, 255, 255, 0.58);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.72);
}

.meta-card strong,
.summary-card strong {
  font-size: 1.15rem;
}

.section-heading {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.inline-heading {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: var(--space-4);
}

.search-field {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-3);
}

.search-field span {
  color: var(--color-ink-soft);
  font-size: 0.95rem;
}

.search-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-3);
}

input[type="search"] {
  width: 100%;
  min-height: 4rem;
  border: 1px solid var(--color-line-strong);
  border-radius: calc(var(--radius-lg) + var(--space-1));
  background: rgba(255, 255, 255, 0.82);
  padding: var(--space-4) var(--space-5);
  color: var(--color-ink);
  font-size: 1.18rem;
  letter-spacing: 0.04em;
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

input[type="search"]:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 0.25rem rgba(129, 74, 43, 0.12);
  transform: translateY(-1px);
}

button {
  border: 0;
  cursor: pointer;
}

#room-submit,
.chip-button {
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast),
    color var(--transition-fast);
}

#room-submit {
  min-width: 8rem;
  border-radius: calc(var(--radius-lg) + var(--space-1));
  padding: 0 var(--space-6);
  background: linear-gradient(180deg, var(--color-accent) 0%, var(--color-accent-deep) 100%);
  color: #fffaf3;
  box-shadow: var(--shadow-soft);
}

#room-submit:hover,
#room-submit:focus-visible,
.chip-button:hover,
.chip-button:focus-visible {
  transform: translateY(-1px);
}

#room-submit:focus-visible,
.chip-button:focus-visible {
  outline: 0.125rem solid rgba(129, 74, 43, 0.28);
  outline-offset: 0.125rem;
}

.field-note,
.result-count {
  font-size: 0.92rem;
}

.chip-row {
  position: relative;
  z-index: 1;
  grid-template-columns: repeat(auto-fit, minmax(7rem, max-content));
  gap: var(--space-3);
}

.chip-button {
  justify-self: start;
  padding: var(--space-3) var(--space-4);
  border: 1px solid rgba(78, 56, 39, 0.08);
  border-radius: var(--radius-pill);
  background: var(--color-chip);
  color: var(--color-accent-deep);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.84);
}

.chip-button.is-active {
  background: var(--color-accent);
  color: #fffaf3;
}

.status-banner,
.empty-state {
  padding: var(--space-4) var(--space-5);
  border: 1px solid rgba(78, 56, 39, 0.08);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.62);
}

.status-banner {
  line-height: 1.7;
}

.room-focus,
.suggestion-panel {
  align-content: start;
}

.timetable-panel {
  grid-column: 1 / -1;
}

.empty-state {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-3);
}

.empty-state[hidden] {
  display: none;
}

.empty-state strong {
  font-family: var(--font-serif);
  font-size: 1.3rem;
}

.table-wrap {
  position: relative;
  z-index: 1;
  overflow: auto;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(78, 56, 39, 0.08);
  background: rgba(255, 255, 255, 0.72);
}

.table-wrap.is-hidden {
  display: none;
}

.day-view {
  display: none;
  gap: var(--space-5);
  position: relative;
  z-index: 1;
}

.day-view.is-hidden {
  display: none;
}

.day-switcher,
.day-cards {
  display: grid;
  gap: var(--space-3);
}

.day-switcher {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.day-button {
  display: grid;
  gap: var(--space-1);
  justify-items: start;
  min-height: 4.5rem;
  padding: var(--space-4);
  border: 1px solid rgba(78, 56, 39, 0.08);
  border-radius: var(--radius-lg);
  background: var(--color-chip);
  color: var(--color-accent-deep);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.84);
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-fast),
    background var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast);
}

.day-button span {
  color: var(--color-ink-soft);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.day-button strong {
  font-family: var(--font-serif);
  font-size: 1rem;
}

.day-button.is-active {
  border-color: rgba(129, 74, 43, 0.18);
  background: linear-gradient(180deg, var(--color-panel-strong) 0%, rgba(129, 74, 43, 0.1) 100%);
  color: var(--color-accent-deep);
  box-shadow: var(--shadow-soft);
}

.day-button.is-active span {
  color: var(--color-accent-deep);
}

.day-period-card {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-5);
  border: 1px solid rgba(78, 56, 39, 0.08);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
}

.day-period-card.is-occupied {
  background: linear-gradient(180deg, rgba(143, 85, 48, 0.08) 0%, rgba(255, 255, 255, 0.76) 100%);
}

.day-period-card.is-empty {
  background: linear-gradient(180deg, rgba(40, 93, 77, 0.08) 0%, rgba(255, 255, 255, 0.76) 100%);
}

.day-period-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.period-status {
  display: inline-flex;
  align-items: center;
  min-height: 1.75rem;
  padding: 0 var(--space-3);
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 700;
}

.period-status.is-occupied {
  background: rgba(129, 74, 43, 0.12);
  color: var(--color-accent-deep);
}

.period-status.is-empty {
  background: rgba(40, 93, 77, 0.12);
  color: var(--color-empty);
}

.timetable {
  width: 100%;
  min-width: 58rem;
  border-collapse: separate;
  border-spacing: 0;
}

.timetable th,
.timetable td {
  padding: var(--space-4);
  border-bottom: 1px solid rgba(78, 56, 39, 0.08);
  border-right: 1px solid rgba(78, 56, 39, 0.06);
  vertical-align: top;
}

.timetable thead th {
  position: sticky;
  top: 0;
  z-index: 3;
  background: var(--color-panel-strong);
  text-align: left;
  font-family: var(--font-serif);
  font-size: 1rem;
}

.timetable tbody th {
  position: sticky;
  left: 0;
  z-index: 2;
  min-width: 6.25rem;
  background: var(--color-panel-strong);
  text-align: left;
  font-family: var(--font-serif);
}

.timetable thead th:first-child {
  z-index: 4;
}

.period-label {
  display: grid;
  gap: var(--space-1);
}

.period-label span {
  color: var(--color-ink-soft);
  font-family: var(--font-sans);
  font-size: 0.82rem;
}

.cell-empty,
.cell-occupied {
  min-width: 10rem;
  border-radius: var(--radius-md);
}

.cell-empty {
  background: rgba(40, 93, 77, 0.05);
}

.cell-occupied {
  background: rgba(143, 85, 48, 0.05);
}

.slot-stack {
  display: grid;
  gap: var(--space-3);
}

.course-card,
.empty-pill {
  display: grid;
  gap: var(--space-2);
  padding: var(--space-4);
  border-radius: var(--radius-md);
}

.course-card {
  background: var(--color-occupied-soft);
  box-shadow: inset 0 0 0 1px rgba(129, 74, 43, 0.08);
}

.empty-pill {
  min-height: 100%;
  align-content: center;
  justify-items: start;
  background: var(--color-empty-soft);
  box-shadow: inset 0 0 0 1px rgba(40, 93, 77, 0.08);
}

.course-head {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}

.course-title {
  color: var(--color-occupied);
  font-size: 0.95rem;
}

.week-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 1.75rem;
  padding: 0 var(--space-3);
  border-radius: var(--radius-pill);
  background: rgba(129, 74, 43, 0.12);
  color: var(--color-accent-deep);
  font-size: 0.78rem;
  font-weight: 700;
}

.course-meta,
.empty-pill strong {
  font-size: 0.88rem;
  line-height: 1.6;
}

.empty-pill strong {
  color: var(--color-empty);
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(0.75rem);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 68rem) {
  .hero,
  .content-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    min-height: auto;
  }
}

@media (max-width: 44rem) {
  .page-shell {
    width: min(100% - 1rem, 74rem);
    padding-top: var(--space-4);
  }

  .site-credit {
    margin-top: var(--space-6);
    padding: 0;
  }

  .panel {
    padding: var(--space-6);
    border-radius: var(--radius-lg);
  }

  .meta-strip,
  .summary-grid {
    grid-template-columns: 1fr;
  }

  .inline-heading,
  .search-row {
    grid-template-columns: 1fr;
  }

  #room-submit {
    min-height: 3.5rem;
  }

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

  .chip-button {
    width: 100%;
  }

  .timetable {
    min-width: 48rem;
  }

  .table-wrap {
    display: none;
  }

  .day-view:not(.is-hidden) {
    display: grid;
  }
}