:root {
  --bg: #0f1218;
  --surface: #181c27;
  --border: #2a3142;
  --text: #e8eaef;
  --muted: #8b93a6;
  --accent: #6eb5ff;
  --pool-bg: #1a1f2e;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
  font-family: "Segoe UI", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(1200px 600px at 10% -10%, #1a2340 0%, transparent 50%),
    radial-gradient(800px 400px at 90% 0%, #1e2a22 0%, transparent 45%), var(--bg);
  color: var(--text);
  line-height: 1.45;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 10001;
  padding: 0.5rem 1rem;
  background: var(--accent);
  color: #0f1218;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 8px 0;
}

.skip-link:focus {
  left: 0;
  top: 0;
}

.load-status {
  margin: 0.75rem 0 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.load-status--error {
  color: #ff9a9a;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.page-header {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1.25rem 1rem;
}

.page-header-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.35rem;
}

.page-header h1 {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  flex: 1;
  min-width: 0;
}

.header-youtube {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: #ff4444;
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.header-youtube i {
  font-size: 1.35rem;
}

.header-youtube:hover {
  border-color: #ff4444;
  background: rgba(255, 68, 68, 0.12);
  color: #ff6b6b;
}

.header-youtube:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 520px) {
  .header-youtube-label {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
  }

  .header-youtube {
    padding: 0.5rem 0.6rem;
  }
}

.tagline {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 0.95rem;
  max-width: 52rem;
}

.tagline a {
  color: var(--accent);
}

.toolbar {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.btn-primary {
  border-color: #3d6ea8;
  background: linear-gradient(180deg, #2a4a72, #1e3554);
}

.btn-small {
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
}

.btn:hover {
  border-color: var(--accent);
  background: #1f2533;
}

.btn-primary:hover {
  background: linear-gradient(180deg, #356089, #25466d);
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.tier-board {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.tier-board-tiers {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.tier-row {
  display: flex;
  align-items: stretch;
  min-height: 2.75rem;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.25);
}

.tier-board-tiers .tier-row {
  min-height: 2.5rem;
}

.tier-row.pool {
  background: var(--pool-bg);
  border-style: dashed;
  min-height: auto;
  flex-direction: column;
}

@media (min-width: 720px) {
  .tier-row.pool {
    flex-direction: row;
  }
}

.tier-label {
  flex: 0 0 2.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: #0f1218;
  border: none;
  cursor: pointer;
  padding: 0;
  font-family: inherit;
  transition: filter 0.12s, transform 0.12s;
}

.tier-label:hover {
  filter: brightness(1.08);
}

.tier-label:focus-visible {
  outline: 2px solid #fff;
  outline-offset: -2px;
  z-index: 1;
}

.tier-board-tiers:has(.course-card--selected) .tier-drop-target {
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.45);
}

.pool .tier-label {
  background: linear-gradient(180deg, #5a6578, #3d4558);
  color: #f0f2f6;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  flex-basis: 2.5rem;
}

@media (min-width: 720px) {
  .pool .tier-label {
    flex: 0 0 2.5rem;
    min-height: 8rem;
  }
}

.tier-s .tier-label {
  background: linear-gradient(180deg, #ff6b9d, #c9184a);
}
.tier-a .tier-label {
  background: linear-gradient(180deg, #ffb703, #e85d04);
}
.tier-b .tier-label {
  background: linear-gradient(180deg, #ffd60a, #bc8a00);
}
.tier-c .tier-label {
  background: linear-gradient(180deg, #8ecae6, #219ebc);
}
.tier-d .tier-label {
  background: linear-gradient(180deg, #94d2bd, #2a6f6f);
}
.tier-f .tier-label {
  background: linear-gradient(180deg, #9d8189, #5c4a52);
}

.tier-strip,
.unranked-pool.drop-strip {
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  align-content: flex-start;
  align-items: flex-start;
  gap: 0.35rem;
  padding: 0.4rem 0.5rem;
  min-height: 2.25rem;
  transition: background 0.15s, box-shadow 0.15s;
}

.tier-board-tiers .tier-strip {
  max-height: 5.5rem;
  overflow-y: auto;
  overflow-x: hidden;
}

.pool-panel {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 0.5rem 0.75rem 0.75rem;
}

.dept-manage {
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.18);
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.dept-manage-heading {
  margin: 0;
  font-size: 0.92rem;
  font-weight: 700;
}

.dept-manage-hint {
  margin: 0.15rem 0 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.dept-enabled-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

.dept-empty-hint {
  margin: 0;
  font-size: 0.8rem;
  color: var(--muted);
}

.dept-enabled-chip {
  display: inline-flex;
  align-items: stretch;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  overflow: hidden;
}

.dept-enabled-chip-main {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.3rem 0.55rem;
  cursor: pointer;
  font-family: inherit;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.dept-enabled-chip-main--active {
  background: rgba(110, 181, 255, 0.2);
  color: var(--accent);
}

.dept-enabled-chip-main:hover {
  background: rgba(255, 255, 255, 0.06);
}

.dept-enabled-chip-remove {
  appearance: none;
  border: none;
  border-left: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  width: 1.65rem;
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 0;
}

.dept-enabled-chip-remove:hover {
  color: #ff9a9a;
  background: rgba(255, 100, 100, 0.12);
}

.dept-add-row {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.dept-add-label {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.dept-add-combo {
  position: relative;
}

.add-dept-suggestions {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 4px);
  z-index: 30;
  margin: 0;
  padding: 0.25rem;
  list-style: none;
  max-height: 220px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #12161f;
  box-shadow: var(--shadow);
}

.add-dept-option {
  display: block;
  width: 100%;
  text-align: left;
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text);
  font-size: 0.82rem;
  padding: 0.45rem 0.55rem;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.add-dept-option:hover,
.add-dept-option:focus-visible {
  background: rgba(110, 181, 255, 0.15);
  outline: none;
}

.dept-quick-add {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.dept-quick-add-label {
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 600;
}

.dept-quick-add-btn {
  appearance: none;
  border: 1px dashed var(--border);
  background: transparent;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  cursor: pointer;
  font-family: inherit;
}

.dept-quick-add-btn:hover {
  border-color: var(--accent);
  background: rgba(110, 181, 255, 0.1);
}

.dept-filter-label {
  margin: 0.15rem 0 0;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.pool-dept-hint {
  margin: 0;
  padding: 0.5rem 0.65rem;
  font-size: 0.82rem;
  color: var(--muted);
  background: rgba(110, 181, 255, 0.08);
  border: 1px dashed rgba(110, 181, 255, 0.35);
  border-radius: 8px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.pool-dept-hint-btn {
  flex-shrink: 0;
}

.pool-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
}

.search-wrap {
  flex: 1 1 12rem;
  min-width: 10rem;
}

.pool-search {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #12161f;
  color: var(--text);
  font-size: 0.9rem;
}

.pool-search:focus {
  outline: 2px solid var(--accent);
  border-color: transparent;
}

.pool-meta {
  margin: 0;
  font-size: 0.78rem;
  color: var(--muted);
  flex: 1 1 auto;
}

.dept-filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.dept-chip {
  appearance: none;
  border: 1px solid var(--border);
  background: #1c2230;
  color: var(--muted);
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  cursor: pointer;
}

.dept-chip:hover {
  border-color: var(--accent);
  color: var(--text);
}

.dept-chip--active {
  border-color: var(--accent);
  background: rgba(110, 181, 255, 0.15);
  color: var(--accent);
}

.unranked-pool.drop-strip {
  max-height: min(50vh, 480px);
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(0, 0, 0, 0.2);
  padding: 0.65rem;
}

.drop-strip.drop-hover {
  background: rgba(110, 181, 255, 0.08);
  box-shadow: inset 0 0 0 2px rgba(110, 181, 255, 0.35);
}

.tier-strip:empty::after,
.unranked-pool.drop-strip:empty::after {
  content: "Drop courses here";
  color: var(--muted);
  font-size: 0.8rem;
  opacity: 0.6;
  align-self: center;
  padding: 0.25rem 0;
}

.course-card {
  position: relative;
  max-width: 200px;
  padding: 0.35rem 0.45rem 1.65rem;
  border-radius: 8px;
  background: #222836;
  border: 1px solid #343c4f;
  cursor: grab;
  font-size: 0.76rem;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  transition: transform 0.12s, box-shadow 0.12s, border-color 0.12s;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.course-card--compact {
  max-width: 6.5rem;
  padding: 0.3rem 0.4rem 1.55rem;
}

.course-card--compact .course-title,
.course-card--compact .course-sub {
  display: none;
}

.course-card--selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(110, 181, 255, 0.45);
}

.unranked-pool .course-card {
  max-width: 11rem;
}

.course-quick-tiers {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  gap: 1px;
  padding: 2px;
  background: rgba(0, 0, 0, 0.35);
  border-radius: 0 0 6px 6px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.12s;
}

.course-card:hover .course-quick-tiers,
.course-card:focus-within .course-quick-tiers,
.course-card--selected .course-quick-tiers {
  opacity: 1;
  pointer-events: auto;
}

.tier-quick-btn {
  flex: 1;
  min-width: 0;
  padding: 0.12rem 0;
  border: none;
  border-radius: 3px;
  font-size: 0.58rem;
  font-weight: 800;
  cursor: pointer;
  color: #0f1218;
  line-height: 1.1;
}

.tier-quick-s {
  background: #ff6b9d;
}
.tier-quick-a {
  background: #ffb703;
}
.tier-quick-b {
  background: #ffd60a;
}
.tier-quick-c {
  background: #8ecae6;
}
.tier-quick-d {
  background: #94d2bd;
}
.tier-quick-f {
  background: #9d8189;
  color: #fff;
}
.tier-quick-pool {
  background: #5a6578;
  color: #fff;
  flex: 0 0 1.1rem;
}

.tier-quick-btn:hover {
  filter: brightness(1.1);
}

.tier-quick-btn:focus-visible {
  outline: 1px solid #fff;
}

.course-card:hover {
  border-color: #4a5570;
}

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

.course-card.dragging-source {
  opacity: 0.35;
  cursor: grabbing;
}

.course-card--ghost {
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  cursor: grabbing;
  opacity: 0.95;
}

.course-code {
  font-weight: 700;
  font-size: 0.8rem;
  color: #fff;
  letter-spacing: 0.02em;
}

.course-title {
  color: #c4cad8;
  line-height: 1.28;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.course-sub {
  font-size: 0.66rem;
  color: var(--muted);
  line-height: 1.2;
}

.dept-dialog {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0;
  max-width: min(520px, 92vw);
  max-height: 85vh;
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
}

.dept-dialog::backdrop {
  background: rgba(0, 0, 0, 0.55);
}

.dept-dialog-inner {
  display: flex;
  flex-direction: column;
  max-height: 85vh;
  padding: 1rem 1.1rem;
  gap: 0.65rem;
}

.dept-dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.dept-dialog-header h2 {
  margin: 0;
  font-size: 1.1rem;
}

.dept-dialog-hint {
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.dept-dialog-hint a {
  color: var(--accent);
}

.dept-dialog-hint code {
  font-size: 0.75rem;
}

.dept-dialog-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.dept-checklist {
  flex: 1;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem;
  max-height: 45vh;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.dept-check {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.35rem 0.4rem;
  border-radius: 6px;
  font-size: 0.85rem;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.dept-check:hover {
  background: rgba(255, 255, 255, 0.04);
}

.dept-check input {
  margin-top: 0.2rem;
}

.dept-dialog-footer {
  display: flex;
  justify-content: flex-end;
}

.btn-icon {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.15rem 0.35rem;
}

.btn-icon:hover {
  color: var(--text);
}

.site-footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.25rem 2.5rem;
  text-align: center;
  border-top: 1px solid var(--border);
}

.footer-tools {
  margin-bottom: 1.25rem;
}

.footer-tools-label {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-bottom: 0.65rem;
}

.footer-tools-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem 0.75rem;
  align-items: center;
}

.footer-tool-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.85rem;
  background: var(--surface);
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.88rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.footer-tool-link:hover {
  border-color: var(--accent);
  background: #1f2533;
  color: #fff;
}

.footer-tool-link--current {
  border-color: var(--accent);
  background: rgba(110, 181, 255, 0.12);
  color: #fff;
}

.footer-tool-link i {
  font-size: 0.9em;
  opacity: 0.9;
}

.footer-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0 auto 1rem;
  max-width: 280px;
}

.footer-line {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.6;
}

.footer-line a {
  color: var(--accent);
  text-decoration: none;
}

.footer-line a:hover {
  text-decoration: underline;
}

.footer-sep {
  opacity: 0.45;
  margin: 0 0.35em;
  user-select: none;
}

@media (max-width: 640px) {
  .course-quick-tiers {
    opacity: 1;
    pointer-events: auto;
  }

  .tier-row:not(.pool) {
    flex-direction: column;
  }

  .tier-row:not(.pool) .tier-label {
    flex: 0 0 auto;
    min-height: 2rem;
    writing-mode: horizontal-tb;
    transform: none;
    width: 100%;
  }

  .pool .tier-label {
    writing-mode: horizontal-tb;
    transform: none;
    font-size: 0.75rem;
    flex: 0 0 auto;
    min-height: 2rem;
  }

  .course-card {
    max-width: none;
    width: calc(50% - 0.25rem);
  }

  .unranked-pool .course-card {
    width: calc(50% - 0.25rem);
    max-width: none;
  }
}