:root {
  color-scheme: light;
  --navy-950: #071425;
  --navy-900: #0b1f3a;
  --navy-800: #12365a;
  --navy-700: #1a4a73;
  --teal-700: #0f766e;
  --teal-600: #0d9488;
  --teal-100: #ccfbf1;
  --sky-100: #e0f2fe;
  --slate-900: #172033;
  --slate-700: #3f4b5f;
  --slate-500: #667085;
  --slate-300: #cbd5e1;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --white: #ffffff;
  --danger-700: #b42318;
  --danger-600: #d92d20;
  --danger-100: #fee4e2;
  --danger-50: #fff5f4;
  --amber-100: #fef3c7;
  --shadow: 0 16px 40px rgba(11, 31, 58, 0.08);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 90% 0%, rgba(45, 212, 191, 0.12), transparent 28rem),
    #f4f7fb;
  color: var(--slate-900);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

button, input { font: inherit; }

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

.topbar {
  min-height: 86px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 14px max(24px, calc((100vw - 1540px) / 2));
  background: linear-gradient(112deg, var(--navy-950), var(--navy-900) 58%, #0e4661);
  color: var(--white);
  box-shadow: 0 8px 28px rgba(7, 20, 37, 0.22);
}

.brand-mark {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.08);
  font-size: 0.92rem;
  font-weight: 850;
  letter-spacing: 0.08em;
}

.title-block h1 {
  margin: 1px 0 0;
  font-size: clamp(1.25rem, 2vw, 1.72rem);
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.eyebrow, .section-kicker, .panel-step {
  margin: 0;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.11em;
}

.eyebrow { color: #7dd3fc; }

.session-block {
  padding-left: 20px;
  border-left: 1px solid rgba(255, 255, 255, 0.2);
  text-align: right;
}

.session-block span, .session-block strong { display: block; }
.session-block span { color: #a5f3fc; font-size: 0.78rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; }
.session-block strong { margin-top: 2px; font-size: 0.96rem; }

.page-wrap {
  width: min(1540px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 54px;
}

.overview {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) auto;
  gap: 28px;
  align-items: end;
  margin-bottom: 22px;
}

.section-kicker { color: var(--teal-700); }

.overview h2 {
  margin: 5px 0 5px;
  font-size: clamp(1.45rem, 2.4vw, 2.1rem);
  line-height: 1.16;
  letter-spacing: -0.038em;
}

.overview-copy { margin: 0; color: var(--slate-500); }

.dataset-stats {
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: 8px;
  margin: 0;
}

.dataset-stats div {
  min-width: 94px;
  padding: 10px 13px;
  border: 1px solid var(--slate-200);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.74);
}

.dataset-stats dt { color: var(--slate-500); font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; }
.dataset-stats dd { margin: 2px 0 0; color: var(--navy-900); font-size: 0.98rem; font-weight: 800; white-space: nowrap; }
.dataset-stats div:last-child { min-width: 138px; }

.dashboard-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 410px;
  gap: 20px;
  align-items: start;
}

.selection-panel, .results-panel {
  border: 1px solid var(--slate-200);
  border-radius: 18px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.selection-panel { min-width: 0; overflow: hidden; }

.results-panel {
  position: sticky;
  top: 16px;
  padding: 20px;
}

.panel-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 22px 17px;
  border-bottom: 1px solid var(--slate-200);
}

.results-panel .panel-heading { padding: 0 0 16px; }
.panel-step { color: var(--teal-700); }
.panel-heading h2 { margin: 3px 0 0; font-size: 1.2rem; line-height: 1.25; letter-spacing: -0.02em; }

.all-centres-pill, .live-indicator, .count-badge {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  border-radius: 999px;
  font-size: 0.76rem;
  font-weight: 800;
}

.all-centres-pill { padding: 6px 10px; background: var(--sky-100); color: var(--navy-700); }
.live-indicator { gap: 6px; padding: 6px 9px; background: var(--teal-100); color: var(--teal-700); }
.live-indicator i { width: 7px; height: 7px; border-radius: 50%; background: var(--teal-600); box-shadow: 0 0 0 3px rgba(13,148,136,.13); }

.toolbar {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto auto;
  gap: 10px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--slate-200);
  background: #f8fafc;
}

.search-field {
  display: flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
  height: 42px;
  padding: 0 12px;
  border: 1px solid var(--slate-300);
  border-radius: 10px;
  background: var(--white);
}

.search-field:focus-within { border-color: var(--teal-600); box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.11); }
.search-field svg { width: 18px; flex: 0 0 auto; fill: none; stroke: var(--slate-500); stroke-width: 1.8; stroke-linecap: round; }
.search-field input { min-width: 0; width: 100%; border: 0; outline: 0; color: var(--slate-900); background: transparent; font-size: 0.9rem; }
.search-field input::placeholder { color: #98a2b3; }

.filter-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  border: 1px solid var(--slate-300);
  border-radius: 10px;
  background: var(--white);
  color: var(--slate-700);
  font-size: 0.84rem;
  font-weight: 700;
  cursor: pointer;
}

.filter-toggle input { width: 16px; height: 16px; accent-color: var(--teal-600); }

.clear-button {
  padding: 0 13px;
  border: 0;
  border-radius: 10px;
  background: var(--navy-900);
  color: var(--white);
  font-size: 0.84rem;
  font-weight: 800;
  cursor: pointer;
}
.clear-button:disabled { background: var(--slate-200); color: #94a3b8; cursor: not-allowed; }

.centre-list { padding: 4px 22px 22px; }

.centre-block {
  margin-top: 18px;
  border: 1px solid var(--slate-200);
  border-radius: 14px;
  overflow: hidden;
}

.centre-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  background: linear-gradient(90deg, #eef6fb, #f8fafc);
  border-bottom: 1px solid var(--slate-200);
}

.centre-code {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 10px;
  background: var(--navy-900);
  color: var(--white);
  font-size: 0.76rem;
  font-weight: 850;
  letter-spacing: 0.04em;
}

.centre-header h3 { margin: 0; font-size: 0.98rem; letter-spacing: -0.01em; }
.centre-header p { margin: 1px 0 0; color: var(--slate-500); font-size: 0.76rem; }

.schedule-row {
  display: grid;
  grid-template-columns: 108px minmax(0, 1fr);
  border-top: 1px solid var(--slate-200);
}
.schedule-row:first-of-type { border-top: 0; }

.schedule-label {
  padding: 14px;
  background: #fbfcfe;
  border-right: 1px solid var(--slate-200);
}
.schedule-label strong { display: block; color: var(--navy-800); font-size: 0.94rem; }
.schedule-label span { display: block; margin-top: 3px; color: var(--slate-500); font-size: 0.73rem; }

.course-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  padding: 10px;
}

.course-card {
  position: relative;
  min-width: 0;
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 9px;
  padding: 10px;
  border: 1px solid var(--slate-200);
  border-radius: 10px;
  background: var(--white);
  cursor: pointer;
  transition: border-color 140ms ease, background-color 140ms ease, box-shadow 140ms ease, transform 140ms ease;
}
.course-card:hover { border-color: #8ab4c9; box-shadow: 0 5px 15px rgba(11,31,58,.07); transform: translateY(-1px); }
.course-card:has(input:checked) { border-color: var(--teal-600); background: #effcf9; box-shadow: inset 3px 0 0 var(--teal-600); }
.course-card input { width: 17px; height: 17px; margin: 2px 0 0; accent-color: var(--teal-600); }

.course-content { min-width: 0; }
.course-title-line { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.course-code { color: var(--navy-900); font-size: 0.82rem; font-weight: 850; letter-spacing: 0.015em; }
.course-sessions { flex: 0 0 auto; color: var(--teal-700); font-size: 0.68rem; font-weight: 800; }
.course-name { display: block; margin-top: 2px; color: var(--slate-700); font-size: 0.78rem; line-height: 1.35; }
.course-pattern { display: block; margin-top: 5px; color: var(--slate-500); font-size: 0.69rem; }
.course-equivalent { display: block; margin-top: 4px; color: var(--navy-700); font-size: 0.67rem; font-weight: 700; }

.empty-search { padding: 48px 22px; text-align: center; color: var(--slate-500); }
.empty-search strong, .empty-search span { display: block; }
.empty-search strong { color: var(--slate-900); }

.status-banner {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
  margin-top: 17px;
  padding: 15px;
  border: 1px solid var(--slate-200);
  border-radius: 14px;
  background: var(--slate-100);
}
.status-icon { width: 46px; height: 46px; display: grid; place-items: center; border-radius: 12px; background: var(--white); color: var(--slate-500); font-size: 1.2rem; font-weight: 900; }
.status-banner span, .status-banner strong { display: block; }
.status-banner span { color: var(--slate-500); font-size: 0.76rem; font-weight: 700; }
.status-banner strong { margin-top: 1px; color: var(--navy-900); font-size: 1.18rem; }
.status-safe { border-color: #99e5d7; background: #ebfdf8; }
.status-safe .status-icon { background: var(--teal-600); color: var(--white); }
.status-danger { border-color: #fda29b; background: var(--danger-50); }
.status-danger .status-icon { background: var(--danger-600); color: var(--white); }
.status-danger strong { color: var(--danger-700); }

.result-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-top: 10px;
}
.result-stats div { padding: 10px 9px; border: 1px solid var(--slate-200); border-radius: 10px; background: #fbfcfe; }
.result-stats span { display: block; color: var(--slate-500); font-size: 0.68rem; line-height: 1.25; }
.result-stats strong { display: block; margin-top: 2px; color: var(--navy-900); font-size: 1.08rem; }

.result-section { margin-top: 20px; }
.result-section-title { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 9px; }
.result-section-title h3 { margin: 0; font-size: 0.9rem; }
.count-badge { min-width: 26px; justify-content: center; padding: 3px 8px; background: var(--danger-100); color: var(--danger-700); }
.count-badge.muted { background: var(--slate-100); color: var(--slate-700); }

.clash-list, .selected-list { display: grid; gap: 8px; }

.clash-card {
  padding: 12px;
  border: 1px solid #fecdca;
  border-left: 4px solid var(--danger-600);
  border-radius: 10px;
  background: #fffafa;
}
.clash-when { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 9px; }
.clash-when strong { color: var(--danger-700); font-size: 0.78rem; }
.clash-when span { color: var(--slate-500); font-size: 0.69rem; font-weight: 700; }
.clash-courses { display: grid; grid-template-columns: 1fr; gap: 5px; }
.clash-course { display: grid; grid-template-columns: auto 1fr; gap: 7px; align-items: start; }
.clash-course b { padding: 2px 5px; border-radius: 5px; background: var(--danger-100); color: var(--danger-700); font-size: 0.68rem; }
.clash-course div { min-width: 0; }
.clash-course strong { display: block; color: var(--navy-900); font-size: 0.77rem; }
.clash-course small { display: block; color: var(--slate-500); font-size: 0.68rem; }

.selected-card { padding: 10px 11px; border: 1px solid var(--slate-200); border-radius: 10px; background: #fbfcfe; }
.selected-card strong { display: block; color: var(--navy-900); font-size: 0.78rem; }
.selected-card span { display: block; margin-top: 2px; color: var(--slate-500); font-size: 0.69rem; }

.empty-state { padding: 22px 14px; border: 1px dashed var(--slate-300); border-radius: 11px; text-align: center; }
.empty-state-icon { width: 38px; height: 38px; display: grid; place-items: center; margin: 0 auto 8px; border-radius: 50%; background: var(--teal-100); color: var(--teal-700); font-weight: 900; }
.empty-state strong, .empty-state span { display: block; }
.empty-state strong { font-size: 0.82rem; }
.empty-state span { margin-top: 3px; color: var(--slate-500); font-size: 0.72rem; }
.calculation-note { margin: 17px 0 0; padding-top: 14px; border-top: 1px solid var(--slate-200); color: var(--slate-500); font-size: 0.69rem; line-height: 1.45; }

@media (max-width: 1180px) {
  .overview { grid-template-columns: 1fr; }
  .dataset-stats { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .dashboard-grid { grid-template-columns: minmax(0, 1fr) 360px; }
  .toolbar { grid-template-columns: 1fr auto; }
  .clear-button { min-height: 40px; }
  .filter-toggle { grid-row: 2; grid-column: 1 / -1; min-height: 40px; }
  .course-grid { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .dashboard-grid { grid-template-columns: 1fr; }
  .results-panel { position: static; grid-row: 1; }
  .selected-section { display: none; }
}

@media (max-width: 640px) {
  .topbar { grid-template-columns: auto 1fr; padding: 13px 16px; }
  .brand-mark { width: 46px; height: 46px; border-radius: 12px; }
  .session-block { grid-column: 1 / -1; display: flex; justify-content: space-between; padding: 8px 0 0; border-left: 0; border-top: 1px solid rgba(255,255,255,.18); text-align: left; }
  .page-wrap { width: min(100% - 24px, 1540px); padding-top: 20px; }
  .overview { gap: 16px; }
  .dataset-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dataset-stats div, .dataset-stats div:last-child { min-width: 0; }
  .panel-heading { padding: 17px 15px 14px; }
  .toolbar { grid-template-columns: 1fr; padding: 12px 15px; }
  .filter-toggle { grid-row: auto; grid-column: auto; min-height: 42px; }
  .clear-button { min-height: 42px; }
  .centre-list { padding: 2px 12px 14px; }
  .schedule-row { grid-template-columns: 1fr; }
  .schedule-label { display: flex; justify-content: space-between; gap: 10px; padding: 9px 11px; border-right: 0; border-bottom: 1px solid var(--slate-200); }
  .schedule-label span { margin-top: 0; }
  .results-panel { padding: 16px; }
  .result-stats span { min-height: 34px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}