:root {
  /* Surface */
  --paper:        #ffffff;
  --paper-2:      #f5f5f5;
  --paper-3:      #e6e6e6;
  --ink:          #1a1a1a;
  --ink-2:        #555555;
  --ink-3:        #888888;
  --rule:         #d4d4d4;

  /* IU Crimson */
  --crimson:      #990000;
  --crimson-soft: #f2e6e6;
  --crimson-ink:  #6b0000;

  /* Locations */
  --luddy:        var(--crimson);
  --luddy-soft:   var(--crimson-soft);
  --luddy-ink:    var(--crimson-ink);
  --teter:        #1a5276;
  --teter-soft:   #e8f0f7;
  --teter-ink:    #154360;

  --now-mark:     #1a7a45;

  /* Type */
  --sans: 'BentonSans', 'Franklin Gothic Medium', 'Franklin Gothic', Arial, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, Menlo, monospace;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-family: var(--sans); font-weight: 700; letter-spacing: -0.01em; margin: 0; }

/* ---------- Shared primitives ---------- */
.eyebrow {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.rule { height: 1px; background: var(--rule); border: 0; }

.pip {
  display: inline-block;
  width: 9px; height: 9px;
  border-radius: 50%;
  vertical-align: middle;
  margin-right: 6px;
}
.pip.luddy { background: var(--luddy); }
.pip.teter { background: var(--teter); }

.locchip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: 2px;
}
.locchip.luddy { background: var(--luddy-soft); color: var(--luddy-ink); }
.locchip.teter { background: var(--teter-soft); color: var(--teter-ink); }

.coursechip {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  padding: 2px 6px;
  border-radius: 2px;
  background: var(--paper-3);
  color: var(--ink-2);
  white-space: nowrap;
  user-select: none;
}

.load-error {
  padding: 24px 48px;
  background: var(--crimson-soft);
  color: var(--crimson-ink);
  font-size: 15px;
}

/* ---------- Site nav ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--paper);
  border-bottom: 3px solid var(--crimson);
}
.site-nav-inner {
  padding: 14px 48px;
  display: flex;
  align-items: center;
  gap: 32px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--ink);
}
.brand-mark {
  height: 36px;
  width: auto;
  display: block;
}
.brand-divider {
  width: 1px;
  height: 36px;
  background: var(--rule);
}
.brand-stack { display: flex; flex-direction: column; gap: 3px; }
.brand-text {
  font-family: var(--sans);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1;
}
.brand-sub {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--ink-3);
  line-height: 1;
}
.nav-links { display: flex; gap: 28px; flex: 1; }
.nav-links a {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink-2);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--crimson); border-bottom-color: var(--crimson); border-bottom-width: 1px; }

/* ---------- Schedule shell ---------- */
.schedule-shell { padding: 20px 48px 40px; }

/* ---------- Filter bar ---------- */
.filter-bar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 16px 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  flex-wrap: wrap;
}
.filter-bar-left { display: flex; flex-wrap: wrap; gap: 18px 30px; align-items: center; }
.filter-bar-right { display: flex; align-items: center; gap: 14px; font-size: 14px; color: var(--ink-2); }
.match-count strong { font-family: var(--mono); font-weight: 600; color: var(--ink); }
.reset-btn {
  background: transparent;
  border: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 6px 12px;
  cursor: pointer;
  color: var(--ink-2);
}
.reset-btn:hover { border-color: var(--crimson); color: var(--crimson); }
.chip-row { display: flex; align-items: center; gap: 8px; }
.chip-label {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-right: 4px;
}
.course-select {
  font-family: var(--sans);
  font-size: 14px;
  border: 1px solid var(--rule);
  background: var(--paper);
  padding: 7px 30px 7px 12px;
  border-radius: 2px;
  color: var(--ink);
  cursor: pointer;
  min-width: 260px;
}
.course-select:focus { outline: none; border-color: var(--crimson); }
.clear-btn {
  width: 26px; height: 26px;
  border: 1px solid var(--rule);
  background: var(--paper);
  border-radius: 2px;
  font-size: 16px;
  cursor: pointer;
  color: var(--ink-2);
  line-height: 1;
}

/* ---------- Filter chips ---------- */
.filter-chip {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  padding: 7px 16px;
  border-radius: 2px;
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.12s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.filter-chip.active {
  border-color: var(--crimson);
  background: var(--crimson);
  color: #ffffff;
}
.filter-chip.active .pip { box-shadow: 0 0 0 1px #ffffff; }

/* ---------- Schedule grid ---------- */
.grid-frame {
  border: 1px solid var(--rule);
  background: var(--paper);
  margin-top: 20px;
}
.grid-frame { --day-cols: 72px repeat(7, 1fr); }
.grid-header {
  display: grid;
  grid-template-columns: var(--day-cols);
  border-bottom: 2px solid var(--ink);
}
.grid-corner { background: var(--paper-2); border-right: 1px solid var(--rule); }
.grid-day-head {
  padding: 16px;
  border-right: 1px solid var(--rule);
  background: var(--paper-2);
}
.grid-day-head:last-child { border-right: 0; }
.grid-day-name { font-family: var(--sans); font-size: 16px; font-weight: 700; color: var(--ink); letter-spacing: 0.04em; text-transform: uppercase; }
.grid-day-head.is-today .grid-day-name { color: var(--crimson); }

/* Closed days: narrow, hatched. */
.grid-day-head.is-closed { padding: 16px 0; text-align: center; background: var(--paper-2); }
.grid-day-head.is-closed .grid-day-name { font-size: 13px; color: var(--ink-3); font-weight: 600; }
.day-col.is-closed {
  background-color: var(--paper-2);
  background-image: repeating-linear-gradient(
    -45deg,
    rgba(26, 26, 26, 0.08) 0 1px,
    transparent 1px 9px
  );
}
.closed-label {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-90deg);
  padding: 6px 10px;
  background: var(--paper);
  border: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
  white-space: nowrap;
}

.grid-body { display: grid; grid-template-columns: var(--day-cols); }
.hour-gutter { position: relative; background: var(--paper-2); border-right: 1px solid var(--rule); }
.hour-label {
  position: absolute;
  right: 10px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  font-weight: 500;
}
.hour-ampm { font-size: 10px; opacity: 0.7; margin-left: 1px; }

.day-col { position: relative; border-right: 1px solid var(--rule); }
.day-col:last-child { border-right: 0; }
.hour-line { position: absolute; left: 0; right: 0; border-top: 1px solid var(--rule); }

.now-line {
  position: absolute;
  left: -2px; right: -2px;
  height: 0;
  border-top: 2px solid var(--now-mark);
  z-index: 50;
  pointer-events: none;
}
.now-line-dot {
  position: absolute;
  left: -6px; top: -6px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--now-mark);
  box-shadow: 0 0 0 3px var(--paper);
}
.now-line-label {
  position: absolute;
  right: 6px; top: -16px;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--now-mark);
  background: var(--paper);
  padding: 0 4px;
}

.grid-legend {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 14px 20px;
  border-top: 1px solid var(--rule);
  background: var(--paper-2);
}
.legend-item { display: flex; align-items: center; gap: 10px; }
.legend-meta { font-family: var(--sans); font-size: 14px; color: var(--ink-2); }
.legend-spacer { flex: 1; }

/* ---------- Shift blocks ---------- */
.shift-block {
  position: absolute;
  padding: 8px 10px 9px;
  border-radius: 0 2px 2px 0;
  overflow: hidden;
  font-size: 12px;
  line-height: 1.3;
  cursor: pointer;
  /* Top and right edges keep stacked blocks separated. */
  box-shadow:
    0 -1px 0 rgba(0, 0, 0, 0.10),
    1px 0 0 rgba(0, 0, 0, 0.08),
    0 2px 5px -1px rgba(0, 0, 0, 0.14);
  transition: box-shadow 0.12s ease;
}
.shift-block:hover {
  box-shadow:
    0 -1px 0 rgba(0, 0, 0, 0.14),
    1px 0 0 rgba(0, 0, 0, 0.12),
    0 6px 16px -2px rgba(0, 0, 0, 0.26);
}
.shift-block.luddy {
  background: var(--luddy-soft);
  border-left: 3px solid var(--luddy);
  color: var(--luddy-ink);
}
.shift-block.teter {
  background: var(--teter-soft);
  border-left: 3px solid var(--teter);
  color: var(--teter-ink);
}
.sb-name {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 14px;
  color: var(--ink);
  margin-bottom: 2px;
}
.sb-time {
  font-family: var(--mono);
  font-size: 11px;
  opacity: 0.75;
  margin-bottom: 6px;
  letter-spacing: 0.04em;
}
.sb-courses { display: flex; flex-wrap: wrap; gap: 2px; }
.sb-course {
  font-family: var(--mono);
  font-size: 11px;
  padding: 1px 5px;
  background: rgba(0, 0, 0, 0.07);
  color: var(--ink);
  border-radius: 2px;
  white-space: nowrap;
  font-weight: 500;
}
.sb-overflow {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-3);
  padding: 1px 2px;
  align-self: center;
}

/* ---------- Shift group block (multi-tutor) ---------- */
.shift-group { padding: 7px 9px 8px; }
.shift-group .sg-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
}
.shift-group .sg-time {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  opacity: 0.85;
}
.shift-group .sg-count {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.6);
  padding: 2px 6px;
  border-radius: 2px;
}
.sg-avatars {
  display: flex;
  flex-wrap: wrap;
  gap: 3px 4px;
  margin-bottom: 7px;
}
.sg-chip {
  display: inline-flex;
  align-items: center;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
  padding: 2px 7px;
  border-radius: 3px;
  user-select: none;
  flex: 0 0 auto;
  line-height: 1.4;
}
.shift-block.luddy .sg-chip { background: var(--luddy); }
.shift-block.teter .sg-chip { background: var(--teter); }
.sg-chip-more {
  background: transparent !important;
  border: 1px dashed var(--ink-3);
  color: var(--ink-2) !important;
  font-family: var(--mono);
  font-weight: 500;
}

/* Roster modal avatars */
.sg-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #fff;
  user-select: none;
  flex: 0 0 auto;
}
.sg-cn {
  font-size: 9px;
  margin-left: 3px;
  opacity: 0.6;
  font-weight: 500;
}

/* ---------- Group roster modal ---------- */
.detail-group .group-coverage {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}
.group-cov-chip {
  font-size: 13px;
  padding: 3px 8px;
  background: var(--paper-2);
  border: 1px solid var(--rule);
}
.group-cov-n {
  font-family: var(--mono);
  font-size: 11px;
  margin-left: 4px;
  color: var(--ink-3);
  font-weight: 500;
}
.group-roster {
  display: flex;
  flex-direction: column;
}
.group-tutor {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 14px;
  padding: 12px 4px;
  border-top: 1px solid var(--rule);
  cursor: pointer;
  text-align: left;
  background: transparent;
  border-left: 0; border-right: 0; border-bottom: 0;
  width: 100%;
}
.group-tutor:first-child { border-top: 0; padding-top: 4px; }
.group-tutor:hover { background: var(--paper-2); }
.sg-avatar-lg {
  width: 36px;
  height: 36px;
  font-size: 13px;
  align-self: start;
  margin-top: 2px;
}
.sg-avatar-luddy { background: var(--luddy); color: #fff; }
.sg-avatar-teter { background: var(--teter); color: #fff; }
.group-tutor-name {
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}
.group-tutor-spec {
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-2);
  margin: 2px 0 6px;
}
.group-tutor-courses {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

/* ---------- Hover tooltip card ---------- */
.hover-card {
  position: fixed;
  width: 380px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--crimson);
  box-shadow: 0 8px 32px -8px rgba(0, 0, 0, 0.25);
  padding: 18px 22px 20px;
  z-index: 100;
  pointer-events: none;
  font-family: var(--sans);
}
.hover-card.hidden { display: none; }
.hover-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
}
.hover-card-name { font-family: var(--sans); font-size: 24px; font-weight: 700; }
.hover-card-spec {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 400;
  color: var(--ink-2);
  margin-bottom: 10px;
}
.hover-card-when {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-2);
  margin-bottom: 10px;
}
.hover-card-when-big {
  font-family: var(--sans);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.hover-card-place {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink-2);
  margin-top: 3px;
}
.hover-card-courses { border-top: 1px solid var(--rule); padding-top: 10px; }
.hover-card-courses-list { display: flex; flex-wrap: wrap; gap: 4px; }

.hover-card-section { border-top: 1px solid var(--rule); padding-top: 12px; margin-top: 12px; }
.hover-card-section:first-of-type { margin-top: 0; }
.hover-card-section-title {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  margin-bottom: 10px;
}
.hover-card-tutors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.hover-card-tutors li {
  display: grid;
  grid-template-columns: 12px 1fr;
  align-items: baseline;
  column-gap: 10px;
  row-gap: 1px;
}
.hover-tutor-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  align-self: center;
}
.hover-tutor-dot.luddy { background: var(--luddy); }
.hover-tutor-dot.teter { background: var(--teter); }
.hover-tutor-name {
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.2;
}
.hover-tutor-spec {
  grid-column: 2;
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-2);
  line-height: 1.2;
}
.hover-cov-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 14px;
}
.hover-cov-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 4px 0;
  border-bottom: 1px solid var(--paper-3);
}
.hover-cov-row:last-child, .hover-cov-row:nth-last-child(2) { border-bottom: 0; }
.hover-cov-code {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}
.hover-cov-n {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  color: var(--crimson);
  margin-left: 8px;
}

/* ---------- Shift detail drawer ---------- */
.detail-drawer.hidden { display: none; }
.detail-courses { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.detail-dept-courses { display: flex; flex-wrap: wrap; gap: 4px; }
.detail-drawer {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.detail-card {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-top: 4px solid var(--crimson);
  width: 100%;
  max-width: 620px;
  padding: 32px 40px 28px;
  position: relative;
  box-shadow: 0 24px 80px -16px rgba(0,0,0,0.35);
}
.detail-close {
  position: absolute;
  top: 16px; right: 16px;
  width: 34px; height: 34px;
  border-radius: 2px;
  border: 1px solid var(--rule);
  background: var(--paper);
  font-size: 20px;
  cursor: pointer;
  color: var(--ink-2);
  line-height: 1;
}
.detail-close:hover { background: var(--paper-2); border-color: var(--ink); }
.detail-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; }
.detail-name {
  font-family: var(--sans);
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 4px 0;
  line-height: 1;
}
.detail-spec { font-family: var(--sans); font-size: 16px; font-weight: 400; color: var(--ink-2); }
.detail-when {
  margin-top: 14px;
  padding: 12px 16px;
  background: var(--paper-2);
  border-left: 3px solid var(--crimson);
}
.detail-dept { padding: 10px 0; }
.detail-dept-name {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 6px;
}
.detail-link {
  display: inline-block;
  margin-top: 20px;
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 700;
  color: var(--crimson);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- Footer ---------- */
.site-foot {
  border-top: 1px solid var(--rule);
  margin-top: 8px;
  padding: 16px 48px 20px;
  background: var(--paper-2);
}
.site-foot-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  font-family: var(--sans);
  font-size: 13px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
  flex-wrap: wrap;
}
.site-foot-inner a {
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
}
.site-foot-inner a:hover { color: var(--crimson); border-bottom-color: var(--crimson); }
.foot-locs { font-family: var(--sans); font-size: 13px; color: var(--ink-2); }
.foot-locs .pip { margin: 0 4px 0 0; vertical-align: baseline; }

/* ---------- Tutors page (roster) ---------- */
.roster-wrap { padding: 24px 48px 64px; }
.roster-mast {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  padding-bottom: 16px;
  border-bottom: 3px solid var(--crimson);
}
.roster-mast .eyebrow { margin-bottom: 6px; }
.roster-mast h1 {
  font-family: var(--sans);
  font-size: 44px;
  line-height: 1;
  letter-spacing: -0.02em;
  font-weight: 700;
}
.roster-mast .back {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 700;
  color: var(--crimson);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 1px solid var(--crimson);
  letter-spacing: 0.02em;
}
.roster-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 48px;
  margin-top: 8px;
}
.tutor-card {
  padding: 20px 0 16px;
  border-bottom: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 20px;
  align-items: start;
}
.t-name { font-family: var(--sans); font-size: 22px; font-weight: 700; line-height: 1.1; }
.t-spec { font-family: var(--sans); color: var(--ink-2); font-size: 15px; margin-top: 4px; }
.t-shifts {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-3);
  margin-top: 10px;
  letter-spacing: 0.04em;
  line-height: 1.5;
}

/* ---------- Course chip tooltip ---------- */
.chip-tooltip {
  position: fixed;
  background: var(--ink);
  border: 1px solid var(--ink);
  box-shadow: 0 4px 12px -2px rgba(0, 0, 0, 0.3);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 400;
  color: #ffffff;
  padding: 6px 12px;
  pointer-events: none;
  z-index: 300;
  white-space: nowrap;
}
.chip-tooltip.hidden { display: none; }

/* Empty state */
.grid-empty {
  padding: 40px 16px;
  text-align: center;
  background: var(--paper-2);
  border: 1px dashed var(--rule);
}
.grid-empty-text {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink-2);
}

/* ---------- Day tabs ---------- */
.day-tabs {
  display: flex;
  border-bottom: 2px solid var(--ink);
  background: var(--paper-2);
  overflow-x: auto;
  scrollbar-width: none;
}
.day-tabs::-webkit-scrollbar { display: none; }
.day-tab {
  flex: 1 0 auto;
  min-width: 56px;
  padding: 12px 8px;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-2);
  cursor: pointer;
  position: relative;
}
.day-tab:last-child { border-right: 0; }
.day-tab.is-today { color: var(--crimson); }
.day-tab.is-today::after {
  content: '';
  position: absolute;
  bottom: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--crimson);
}
.day-tab.active {
  background: var(--paper);
  color: var(--ink);
  box-shadow: inset 0 -3px 0 var(--crimson);
}
.day-tab.active.is-today { color: var(--crimson); }
.day-tab.is-closed { color: var(--ink-3); opacity: 0.45; flex: 0 0 auto; padding-left: 8px; padding-right: 8px; cursor: default; }

/* ---------- Tablet: all 7 days, scroll sideways ---------- */
@media (max-width: 1100px) and (min-width: 769px) {
  .schedule-shell { padding: 16px 24px 32px; }
  .site-nav-inner { padding: 12px 24px; }
  .site-foot { padding: 16px 24px 20px; }
  .grid-frame { overflow-x: auto; }
  .grid-header, .grid-body { min-width: 1000px; }
}

/* ---------- Mobile: one day at a time ---------- */
@media (max-width: 768px) {
  /* Nav */
  .brand-sub { display: none; }
  .brand-divider { display: none; }
  .brand-mark { height: 28px; }
  .brand-text { font-size: 17px; }
  .site-nav-inner { padding: 10px 16px; gap: 14px; }
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 13px; padding: 4px 0; }

  /* Shell + footer */
  .schedule-shell { padding: 6px 12px 20px; }
  .site-foot { padding: 14px 16px 18px; }
  .site-foot-inner { flex-direction: column; align-items: flex-start; gap: 8px; font-size: 12px; }
  .foot-locs { font-size: 12px; }
  .foot-locs .pip { margin-right: 5px; }

  /* Filter bar collapses into a <details> */
  .filter-bar.is-mobile {
    border: 0;
    padding: 0;
    display: block;
  }
  .filter-summary {
    list-style: none;
    cursor: pointer;
    user-select: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 2px;
    border-top: 1px solid var(--rule);
    border-bottom: 1px solid var(--rule);
    font-family: var(--sans);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-2);
  }
  .filter-summary::-webkit-details-marker { display: none; }
  .filter-summary-text strong { font-family: var(--mono); font-weight: 600; color: var(--ink); }
  .filter-summary-arrow {
    font-size: 14px;
    color: var(--ink-3);
    transition: transform 0.18s ease;
    display: inline-block;
  }
  .filter-bar.is-mobile[open] .filter-summary { border-bottom-color: transparent; }
  .filter-bar.is-mobile[open] .filter-summary-arrow { transform: rotate(180deg); }
  .filter-bar.is-mobile > .filter-bar-left,
  .filter-bar.is-mobile > .filter-bar-right {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .filter-bar.is-mobile > .filter-bar-left {
    padding: 14px 0 16px;
    border-bottom: 1px solid var(--rule);
  }
  .filter-bar.is-mobile > .filter-bar-right { padding: 12px 0; }
  .filter-eyebrow { display: none; }
  .chip-row { flex-wrap: wrap; gap: 6px; }
  .chip-label {
    flex-basis: 100%;
    margin: 0 0 4px 0;
    font-size: 11px;
    letter-spacing: 0.12em;
  }
  .filter-chip { padding: 7px 12px; font-size: 12px; }
  .course-select { min-width: 0; width: 100%; font-size: 14px; padding: 9px 30px 9px 12px; }

  /* Schedule frame */
  .grid-frame { margin-top: 12px; border-left: 0; border-right: 0; }
  .grid-body { grid-template-columns: 44px 1fr; }
  .hour-gutter { background: var(--paper); }
  .hour-label { right: 6px; font-size: 11px; }

  /* Day tabs */
  .day-tabs { border-top: 1px solid var(--rule); }
  .day-tab { padding: 11px 6px; font-size: 12px; }

  /* Shift blocks */
  .shift-block { padding: 6px 7px 7px; line-height: 1.25; }
  .sb-name { font-size: 12px; margin-bottom: 1px; line-height: 1.2; word-break: break-word; }
  .sb-time { font-size: 10px; margin-bottom: 4px; opacity: 0.7; }
  .sb-courses { gap: 2px; }
  .sb-course { font-size: 10px; padding: 1px 4px; }
  .sb-overflow { font-size: 10px; padding: 1px 1px; }

  /* Legend */
  .grid-legend {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 12px 14px;
    font-size: 12px;
  }
  .grid-legend .legend-item { gap: 8px; }
  .legend-meta { font-size: 12px; }
  .legend-spacer { display: none; }

  /* Detail drawer, as a bottom sheet */
  .detail-drawer { padding: 0; align-items: flex-end; }
  .detail-card {
    max-width: 100%;
    padding: 22px 20px 28px;
    border-top-width: 3px;
    border-bottom: 0;
    border-left: 0;
    border-right: 0;
    max-height: 92vh;
    overflow-y: auto;
    box-shadow: 0 -8px 32px -8px rgba(0,0,0,0.35);
  }
  .detail-top { gap: 12px; }
  .detail-name { font-size: 26px; }
  .detail-spec { font-size: 14px; }
  .detail-when { padding: 10px 12px; font-size: 14px; margin-top: 12px; }
  .detail-when span:first-child { font-size: 16px !important; }
  .detail-courses { grid-template-columns: 1fr; gap: 4px; }
  .detail-close { top: 12px; right: 12px; width: 36px; height: 36px; font-size: 22px; }
  .detail-link { font-size: 14px; margin-top: 16px; }

  /* Tutors page */
  .roster-wrap { padding: 20px 16px 40px; }
  .roster-mast { flex-direction: column; align-items: flex-start; gap: 12px; }
  .roster-mast h1 { font-size: 32px; }
  .roster-grid { grid-template-columns: 1fr; gap: 0; }
  .tutor-card { grid-template-columns: 1fr; gap: 10px; padding: 18px 0 16px; }
  .t-name { font-size: 20px; }
  .t-spec { font-size: 14px; }
}

/* On touch, tapping opens the drawer directly, so skip the hover card. */
@media (hover: none) and (pointer: coarse) {
  .hover-card { display: none !important; }
}