:root {
  --bg-top: #f4efe2;
  --bg-bottom: #dbe7df;
  --bg-accent-left: rgba(239, 182, 110, 0.28);
  --bg-accent-right: rgba(81, 152, 132, 0.2);
  --surface: rgba(255, 250, 241, 0.86);
  --surface-strong: rgba(255, 248, 238, 0.96);
  --border: rgba(25, 48, 43, 0.12);
  --text: #17332f;
  --muted: #506a64;
  --shadow: 0 24px 60px rgba(18, 43, 39, 0.12);
  --slot-height: 68px;
  --grid-line: rgba(255, 255, 255, 0.16);
  --eyebrow: #8c5b2f;
  --chip-bg: rgba(255, 252, 247, 0.75);
  --empty-column: #7a7a73;
  --modal-backdrop: rgba(20, 30, 26, 0.44);
  --icon-button-bg: rgba(20, 30, 26, 0.08);
  --code-bg: rgba(22, 48, 44, 0.08);
  --link: #9a4e29;
  --focus-ring: rgba(20, 51, 46, 0.4);
  --toggle-bg: rgba(255, 252, 247, 0.8);
  --toggle-border: rgba(24, 47, 43, 0.14);
  --toggle-hover: rgba(255, 248, 238, 0.98);
  --chip-active-bg: #17332f;
  --chip-active-text: #ffffff;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg-top: #121c20;
  --bg-bottom: #081013;
  --bg-accent-left: rgba(210, 122, 56, 0.18);
  --bg-accent-right: rgba(66, 150, 138, 0.18);
  --surface: rgba(15, 25, 30, 0.82);
  --surface-strong: rgba(14, 22, 27, 0.96);
  --border: rgba(166, 206, 197, 0.16);
  --text: #e7f0eb;
  --muted: #9db2ac;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.34);
  --grid-line: rgba(255, 255, 255, 0.06);
  --eyebrow: #d89e68;
  --chip-bg: rgba(22, 36, 42, 0.9);
  --empty-column: #8d9d98;
  --modal-backdrop: rgba(3, 7, 9, 0.64);
  --icon-button-bg: rgba(231, 240, 235, 0.08);
  --code-bg: rgba(231, 240, 235, 0.1);
  --link: #f0b37b;
  --focus-ring: rgba(200, 230, 221, 0.4);
  --toggle-bg: rgba(15, 25, 30, 0.92);
  --toggle-border: rgba(166, 206, 197, 0.18);
  --toggle-hover: rgba(27, 42, 49, 0.98);
  --chip-active-bg: #90e0ef;
  --chip-active-text: #081013;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, var(--bg-accent-left), transparent 30%),
    radial-gradient(circle at right center, var(--bg-accent-right), transparent 28%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.7), transparent 85%);
}

.page-shell {
  width: min(1400px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 20px 0 36px;
}

.hero,
.toolbar,
.board,
.status,
.syllabus-panel {
  position: relative;
  z-index: 1;
}

.hero {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 14px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--eyebrow);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;
  font-weight: 700;
}

h1 {
  font-size: clamp(1.8rem, 3vw, 3rem);
  line-height: 1;
  white-space: nowrap;
}

.theme-toggle {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid var(--toggle-border);
  border-radius: 999px;
  background: var(--toggle-bg);
  color: var(--text);
  font: inherit;
  cursor: pointer;
  backdrop-filter: blur(16px);
  transition: background 150ms ease, transform 150ms ease, border-color 150ms ease;
}

.theme-toggle:hover,
.theme-toggle:focus-visible {
  background: var(--toggle-hover);
  transform: translateY(-1px);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}

.theme-toggle-icon {
  display: inline-grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.92rem;
}

.toolbar-copy,
.status {
  max-width: 60ch;
  color: var(--muted);
}

.toolbar {
  display: flex;
  justify-content: flex-start;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--surface);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
}

.variant-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  flex: 1 1 auto;
}

.variant-option {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  border: 1px solid rgba(0, 0, 0, 0);
  border-radius: 999px;
  background: var(--chip-bg);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 140ms ease, border-color 140ms ease, color 140ms ease;
}

.variant-option input {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
}

.variant-option:has(input:checked) {
  background: var(--chip-active-bg);
  color: var(--chip-active-text);
  border-color: var(--chip-active-bg);
}

.variant-option:hover {
  border-color: var(--toggle-border);
}

.variant-option:focus-within {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.program-total {
  margin: 0;
  padding: 6px 0 6px 14px;
  border-left: 1px solid var(--toggle-border);
  color: var(--muted);
  font-size: 0.9rem;
  white-space: nowrap;
  flex: 0 0 auto;
}

.board {
  display: grid;
  grid-template-columns: repeat(6, minmax(180px, 1fr));
  gap: 12px;
  align-items: start;
}

.semester-column {
  min-height: 280px;
  padding: 14px 12px 12px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: var(--surface);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
  animation: rise-in 360ms ease both;
}

.semester-column h3 {
  margin-bottom: 8px;
  font-size: 0.95rem;
}

.semester-heading {
  white-space: nowrap;
}

.cards {
  display: grid;
  gap: 7px;
}

.course-slot {
  display: grid;
  gap: 6px;
  min-height: var(--slot-height);
}

.course-card {
  width: 100%;
  min-height: var(--slot-height);
  height: 100%;
  padding: 8px 10px;
  border: 0;
  border-radius: 14px;
  text-align: left;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: 0 10px 24px rgba(23, 40, 35, 0.14);
  cursor: pointer;
  transform: translateY(0);
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.course-card-type-1 {
  border: 4px solid #000000;
}

.course-card-type-2 {
  border: 4px dashed #000000;
}

.course-card:hover,
.course-card:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 18px 28px rgba(23, 40, 35, 0.18);
}

.course-card:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 3px;
}

.course-title {
  display: block;
  margin-bottom: 2px;
  font-weight: 700;
  font-size: 0.9rem;
  line-height: 1.18;
}

.course-subtitle {
  display: block;
  font-size: 0.75rem;
  line-height: 1.2;
  opacity: 0.86;
}

.status {
  margin: 10px 4px 0;
  min-height: 1.5em;
  font-size: 0.9rem;
}

.empty-column {
  color: var(--empty-column);
  font-size: 0.92rem;
}

.empty-slot {
  min-height: var(--slot-height);
}

.syllabus-modal {
  width: min(760px, calc(100vw - 24px));
  border: 0;
  padding: 0;
  background: transparent;
}

.syllabus-modal::backdrop {
  background: var(--modal-backdrop);
  backdrop-filter: blur(4px);
}

.syllabus-panel {
  position: relative;
  overflow: hidden;
  border-radius: 28px;
  background: var(--surface-strong);
  box-shadow: 0 28px 70px rgba(14, 30, 27, 0.22);
}

.syllabus-header {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: start;
  padding: 24px 24px 0;
}

.icon-button {
  width: 42px;
  height: 42px;
  border: 0;
  border-radius: 999px;
  background: var(--icon-button-bg);
  color: var(--text);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}

.syllabus-close {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 3;
}

.syllabus-content {
  padding: 18px 24px 28px;
  max-height: 72vh;
  overflow: auto;
  line-height: 1.6;
}

.syllabus-content > h1:first-child {
  position: sticky;
  top: 0;
  z-index: 2;
  margin: 0 54px 0.4em 0;
  padding: 12px 0 8px;
  background: var(--surface-strong);
}

.syllabus-content h1,
.syllabus-content h2,
.syllabus-content h3 {
  margin: 1.2em 0 0.4em;
  font-size: 1.1rem;
}

.syllabus-content p,
.syllabus-content ul,
.syllabus-content ol {
  margin: 0.7em 0;
}

.syllabus-content ol {
  list-style-type: decimal;
}

.syllabus-content ol ol {
  list-style-type: lower-alpha;
}

.syllabus-content ol ol ol {
  list-style-type: decimal;
}

.syllabus-content code {
  padding: 0.1em 0.3em;
  border-radius: 6px;
  background: var(--code-bg);
}

.syllabus-content a {
  color: var(--link);
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }

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

@media (max-width: 1100px) {
  .board {
    grid-template-columns: repeat(3, minmax(180px, 1fr));
  }
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100vw - 20px, 680px);
    padding-top: 16px;
  }

  h1 {
    white-space: normal;
  }

  .hero {
    align-items: start;
  }

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

  .board {
    grid-template-columns: repeat(2, minmax(180px, 1fr));
  }
}

@media (max-width: 400px) {
  .board {
    grid-template-columns: 1fr;
  }
}