/* Engineering-pad paper, pencil ink, and a highlighter for what you're about to take. */
:root {
  --paper: #edf2e4;
  --grid: #e1e9d5;
  --done-soft: #d9e6d6;
  --card: #fbfcf8;
  --ink: #18262b;
  --pencil: #56665f;
  --rule: #b9c9ae;
  --pen: #1d4f7a;
  --done: #2e6a4c;
  --done-ink: #ffffff;
  --doing: #a86a12;
  --todo: #8fa39a;
  --marker: #f5ea61;
  --marker-ink: #18262b;
  --picked: color-mix(in srgb, var(--marker) 55%, var(--card));
  --chart: #2a7d55;
  --danger: #a33a2a;
  --focus: #1d4f7a;
  --display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --body: "Public Sans", system-ui, sans-serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #132019; --grid: #17251d; --done-soft: #1f3529; --card: #18271f; --ink: #e5ede5; --pencil: #9fb2a7; --rule: #2f4538;
    --pen: #8dbbe3; --done: #4fa57a; --done-ink: #0d1a13; --doing: #e0a54f; --todo: #5d7468;
    --marker: #d9cf3f; --marker-ink: #141a10; --picked: #d9cf3f; --chart: #4fa57a; --danger: #e48a78; --focus: #8dbbe3; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #132019; --grid: #17251d; --done-soft: #1f3529; --card: #18271f; --ink: #e5ede5; --pencil: #9fb2a7; --rule: #2f4538;
  --pen: #8dbbe3; --done: #4fa57a; --done-ink: #0d1a13; --doing: #e0a54f; --todo: #5d7468;
  --marker: #d9cf3f; --marker-ink: #141a10; --picked: #d9cf3f; --chart: #4fa57a; --danger: #e48a78; --focus: #8dbbe3; color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink); font: 400 16px/1.55 var(--body);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  background-attachment: fixed;
}
a { color: var(--pen); text-underline-offset: 2px; }
button, input, select, textarea { font: inherit; color: inherit; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
h1, h2, h3 { font-family: var(--display); font-weight: 700; line-height: 1.05; margin: 0; letter-spacing: 0.005em; }
h1 { font-size: clamp(2.6rem, 6vw, 4.4rem); }
h2 { font-size: 1.9rem; }
h3 { font-size: 1.35rem; font-weight: 600; }
p { margin: 0; }
.muted { color: var(--pencil); }
.small { font-size: 0.875rem; }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }
.stack > * + * { margin-top: 12px; }
.row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* top bar */
.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 14px 0; flex-wrap: wrap; }
.brand { font-family: var(--display); font-weight: 700; font-size: 1.6rem; color: var(--ink); text-decoration: none; display: flex; gap: 10px; align-items: center; }
.brand svg { width: 28px; height: 28px; }
.theme svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.who { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

/* controls */
.btn {
  border: 2px solid var(--ink); background: var(--ink); color: var(--paper); padding: 9px 16px; border-radius: 4px;
  font-weight: 600; cursor: pointer; text-decoration: none; display: inline-flex; align-items: center; gap: 6px; line-height: 1.2;
}
.btn:hover { background: var(--pen); border-color: var(--pen); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--card); color: var(--pen); border-color: var(--pen); }
.btn.small { padding: 5px 10px; font-size: 0.875rem; border-width: 1.5px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.link { background: none; border: 0; padding: 0; color: var(--pen); text-decoration: underline; cursor: pointer; }
label.field { display: grid; gap: 4px; font-weight: 600; font-size: 0.925rem; }
input[type="email"], input[type="password"], input[type="text"], select, textarea {
  width: 100%; padding: 10px 12px; border: 1.5px solid var(--rule); border-radius: 4px; background: var(--card); font-weight: 400;
}
input:focus, select:focus, textarea:focus { border-color: var(--pen); }
textarea { min-height: 180px; font-size: 0.9rem; }
.error { color: var(--danger); font-weight: 600; }
.note { border-left: 4px solid var(--marker); background: var(--card); padding: 10px 14px; }

.sheet { background: var(--card); border: 1.5px solid var(--rule); border-radius: 6px; padding: 20px; }
.sheet.tight { padding: 14px 16px; }

/* landing */
.hero { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr); gap: 40px; align-items: start; padding: 28px 0 32px; }
.hero h1 { max-width: 12ch; }
.hero .lede { font-size: 1.15rem; max-width: 52ch; margin-top: 18px; }
.steps { list-style: none; padding: 0; margin: 24px 0 0; display: grid; gap: 10px; max-width: 54ch; }
.steps li { display: grid; grid-template-columns: 30px 1fr; gap: 10px; align-items: baseline; }
.steps b { font-family: var(--display); font-size: 1.3rem; color: var(--pen); }
.demo-cap { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 10px; }
.foot { padding: 32px 0 40px; color: var(--pencil); font-size: 0.875rem; display: grid; gap: 6px; }
.tabs { display: flex; border-bottom: 1.5px solid var(--rule); margin-bottom: 16px; gap: 4px; flex-wrap: wrap; }
.tabs button { background: none; border: 0; padding: 8px 12px; font-weight: 600; color: var(--pencil); cursor: pointer; border-bottom: 3px solid transparent; margin-bottom: -1.5px; }
.tabs button[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--ink); }
.demo-flag { background: var(--marker); color: var(--marker-ink); padding: 6px 10px; border-radius: 3px; font-size: 0.85rem; }

/* flowchart: the degree as boxes by suggested semester */
.flow { overflow-x: auto; padding-bottom: 4px; position: relative; }
.flow-grid { display: grid; grid-template-columns: repeat(8, minmax(112px, 1fr)); gap: 0 8px; min-width: 940px; }
.flow-col { display: flex; flex-direction: column; gap: 6px; padding: 0 2px 4px; border-radius: 4px; }
.flow-col.now { background: color-mix(in srgb, var(--marker) 14%, transparent); }
.flow-head { display: grid; font-family: var(--display); font-size: 1rem; line-height: 1.15; padding: 4px 2px 6px; border-bottom: 1.5px solid var(--rule); margin-bottom: 2px; }
.flow-head b { font-weight: 700; }
.flow-head span { color: var(--pencil); font-weight: 500; }
.tile {
  border: 1.5px solid var(--rule); border-radius: 3px; padding: 5px 7px 6px; background: var(--card);
  display: grid; align-content: start; gap: 1px; text-align: left; width: 100%; cursor: default;
}
.tile .code { font-family: var(--display); font-weight: 600; font-size: 0.98rem; line-height: 1.1; }
.tile .t { font-size: 0.7rem; line-height: 1.25; color: var(--pencil); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.tile.done { background: var(--done-soft); border-color: transparent; color: var(--pencil); }
.tile.done .code { color: var(--done); }
.tile.doing { border-color: var(--doing); background: repeating-linear-gradient(135deg, var(--card) 0 6px, color-mix(in srgb, var(--doing) 16%, var(--card)) 6px 8px); }
.tile.next { background: var(--marker); border-color: var(--marker); color: var(--marker-ink); }
.tile.next .t { color: inherit; opacity: 0.8; }
.tile.open { border-color: var(--ink); }
.tile.later { opacity: 0.7; }
.tile.ge.later, .tile.ge.open { border-style: dashed; }
.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: 0.8rem; color: var(--pencil); }
.legend i { display: inline-block; width: 16px; height: 11px; border-radius: 2px; vertical-align: -1px; margin-right: 5px; border: 1.5px solid var(--rule); background: var(--card); }
.legend i.done { background: var(--done-soft); border-color: var(--done-soft); }
.legend i.doing { border-color: var(--doing); background: repeating-linear-gradient(135deg, var(--card) 0 3px, color-mix(in srgb, var(--doing) 35%, var(--card)) 3px 5px); }
.legend i.next { background: var(--marker); border-color: var(--marker); }
.legend i.open { border-color: var(--ink); }
.legend i.later { opacity: 0.7; }

/* plan page */
.plan { padding-bottom: 24px; }
.plan-head { display: flex; justify-content: space-between; align-items: end; gap: 16px; flex-wrap: wrap; margin-top: 8px; }
.conc { font-size: clamp(2rem, 4.5vw, 2.8rem); margin-top: 2px; }
.term-pick { display: flex; gap: 8px; align-items: center; font-weight: 600; font-size: 0.925rem; }
.term-pick select { width: auto; }
.meter { display: flex; height: 8px; border-radius: 99px; background: var(--card); border: 1px solid var(--rule); overflow: hidden; margin-top: 18px; }
.meter span { display: block; height: 100%; }
.m-done { background: var(--done); }
.m-doing { background: repeating-linear-gradient(135deg, var(--doing) 0 3px, color-mix(in srgb, var(--doing) 40%, var(--card)) 3px 6px); }
.meter-key { color: var(--pencil); margin-top: 6px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.meter-key .pct b { font-size: 1rem; margin: 0; }
.meter-key .pct span { margin-left: 8px; }
.meter-key b { color: var(--ink); margin: 0 4px 0 12px; }
.meter-key b:first-child { margin-left: 0; }
.cols { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 32px; align-items: start; margin-top: 28px; }
.stack-lg > section + section { margin-top: 36px; }
.sub { margin: 4px 0 12px; }
.side { position: sticky; top: 16px; display: grid; gap: 16px; }
.section-h { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.rows { display: grid; }
.class-row { display: grid; grid-template-columns: 1fr auto; gap: 4px 16px; align-items: center; padding: 12px 10px; border-top: 1px solid var(--rule); }
.rows .class-row:first-child { border-top: 0; }
.class-row.picked { background: var(--picked); color: var(--marker-ink); border-radius: 4px; border-top-color: transparent; }
.class-row.picked + .class-row { border-top-color: transparent; }
.cr-name { display: flex; gap: 0 10px; align-items: baseline; flex-wrap: wrap; }
.cr-name .c, .ge-list .c, .draft-list .c { font-family: var(--display); font-weight: 700; font-size: 1.1rem; white-space: nowrap; }
.cr-title { font-weight: 500; }
.pick-sel { width: auto; padding: 2px 6px; font-family: var(--display); font-weight: 700; font-size: 1.05rem; }
.meta { display: flex; flex-wrap: wrap; gap: 2px 16px; color: var(--pencil); margin-top: 2px; }
.class-row.picked .meta, .class-row.picked .muted { color: inherit; opacity: 0.85; }
.meta .warn, .warn-line { color: var(--danger); font-weight: 600; }
.warn-line { display: block; font-size: 0.8rem; }
.add { border: 1.5px solid var(--ink); background: transparent; color: var(--ink); border-radius: 4px; padding: 5px 14px; font-weight: 600; font-size: 0.875rem; cursor: pointer; min-width: 72px; }
.add:hover { background: var(--ink); color: var(--paper); }
.add.on { background: var(--ink); color: var(--paper); }
.class-row.picked .add { border-color: var(--marker-ink); background: var(--marker-ink); color: var(--marker); }
details > summary { cursor: pointer; }
.more { margin-top: 8px; }
.more > summary { color: var(--pen); font-weight: 600; padding: 8px 0; }
.pick { border-top: 1px solid var(--rule); }
.pick:last-of-type { border-bottom: 1px solid var(--rule); }
.pick > summary { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding: 12px 4px; list-style: none; }
.pick > summary::-webkit-details-marker { display: none; }
.pick > summary::before { content: "+"; font-weight: 700; color: var(--pen); width: 14px; flex: none; }
.pick[open] > summary::before { content: "\2212"; }
.pick-name { flex: 1; font-weight: 600; }
.pick > .rows, .pick > .ge-list, .pick > .note-line, .pick > .blocked { margin: 0 0 12px 18px; }
.tag { font-size: 0.75rem; margin-left: 8px; padding: 1px 7px; border-radius: 99px; border: 1px solid var(--done); color: var(--done); white-space: nowrap; }
.later-list h3 { font-size: 1.1rem; color: var(--pencil); }
.later-list ul { margin: 6px 0 0; padding-left: 18px; color: var(--pencil); font-size: 0.9rem; }
.flow-sec { margin-top: 48px; }
.draft-bar { display: none; }
@media (max-width: 900px) {
  .draft-bar { display: flex; position: fixed; left: 12px; right: 12px; bottom: 12px; justify-content: space-between; align-items: center; gap: 12px;
    background: var(--ink); color: var(--paper); border: 0; border-radius: 6px; padding: 12px 16px; font-weight: 600; z-index: 5; cursor: pointer; }
  body:has(main.has-bar) { padding-bottom: 76px; }
}
.blocked { margin-top: 8px; font-size: 0.875rem; color: var(--pencil); }
.blocked ul { margin: 6px 0 0; padding-left: 18px; }
.draft-list { list-style: none; margin: 10px 0; padding: 0; display: grid; gap: 6px; }
.draft-list li { display: flex; justify-content: space-between; gap: 10px; align-items: center; padding: 6px 10px; border-radius: 3px; background: var(--picked); color: var(--marker-ink); }
.draft-h { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.save-state { font-size: 0.78rem; color: var(--pencil); white-space: nowrap; }
.save-state.error { color: var(--danger); font-weight: 600; }
.draft-list.enrolled li { background: var(--card); border: 1px solid var(--rule); color: var(--ink); }
.draft-list .remove { border: 1.5px solid var(--marker-ink); background: transparent; color: var(--marker-ink); border-radius: 4px; padding: 2px 9px; font-size: 0.8rem; font-weight: 600; cursor: pointer; }
.draft-list .remove:hover { background: var(--marker-ink); color: var(--marker); }
.total { display: flex; justify-content: space-between; border-top: 2px solid var(--ink); padding-top: 8px; font-weight: 700; }
.soon { border: 1.5px dashed var(--rule); border-radius: 6px; padding: 14px 16px; color: var(--pencil); }
.soon h3 { margin-bottom: 4px; color: var(--ink); font-size: 1.15rem; }
.ge-list { list-style: none; padding: 0; display: grid; gap: 8px; }
.ge-list li { display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: center; font-size: 0.92rem; }

/* setup */
.setup { display: grid; gap: 20px; max-width: 900px; padding: 12px 0 40px; }
.drop { border: 2px dashed var(--pencil); border-radius: 6px; padding: 28px; text-align: center; background: var(--card); cursor: pointer; }
.drop.over { border-color: var(--pen); background: color-mix(in srgb, var(--pen) 8%, var(--card)); }
.check-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 6px; }
.tri { border: 1.5px solid var(--rule); background: var(--card); border-radius: 4px; padding: 6px 8px; text-align: left; cursor: pointer; display: grid; gap: 1px; }
.tri .c { font-family: var(--display); font-weight: 700; }
.tri .s { font-size: 0.75rem; color: var(--pencil); }
.tri[data-state="done"] { background: var(--done); border-color: var(--done); color: var(--done-ink); }
.tri[data-state="done"] .s, .tri[data-state="doing"] .s { color: inherit; }
.tri[data-state="doing"] { border-color: var(--doing); background: repeating-linear-gradient(135deg, var(--card) 0 6px, color-mix(in srgb, var(--doing) 22%, var(--card)) 6px 8px); }
table.list { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
table.list th, table.list td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--rule); }
table.list th { font-weight: 600; color: var(--pencil); }
table.list tr.off td { color: var(--pencil); text-decoration: line-through; }
table.list tr.off td:first-child { text-decoration: none; }
table.list input { accent-color: var(--done); width: 18px; height: 18px; }
.areas { display: flex; gap: 6px; flex-wrap: wrap; }
.areas label { border: 1.5px solid var(--rule); border-radius: 4px; padding: 4px 10px; display: flex; gap: 6px; align-items: center; background: var(--card); cursor: pointer; }
.areas input { accent-color: var(--done); }
.scroll { max-height: 320px; overflow: auto; }

@media (max-width: 900px) {
  .hero, .cols { grid-template-columns: minmax(0, 1fr); }
  .who .muted { display: none; }
  .side { position: static; }
}
@media (prefers-reduced-motion: no-preference) {
  .class-row { transition: background-color 0.15s; }
  .flow-grid.reveal .tile { animation: ink 0.5s ease-out both; animation-delay: calc(var(--i, 0) * 18ms); }
  @keyframes ink { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
}

/* usage page (owner only) */
.usage { padding: 8px 16px 40px; }
.usage.refreshing .tiles, .usage.refreshing .chart-row, .usage.refreshing .sheet { opacity: 0.55; transition: opacity 0.2s; }
.usage-head { display: flex; justify-content: space-between; align-items: end; gap: 16px; flex-wrap: wrap; margin: 8px 0 20px; }
.seg { display: inline-flex; border: 1.5px solid var(--rule); border-radius: 6px; overflow: hidden; background: var(--card); }
.seg button { border: 0; background: none; padding: 7px 14px; font-weight: 600; font-size: 0.875rem; color: var(--pencil); cursor: pointer; }
.seg button + button { border-left: 1.5px solid var(--rule); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.tiles { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: 12px; margin-bottom: 16px; }
.tile-stat { background: var(--card); border: 1.5px solid var(--rule); border-radius: 6px; padding: 14px 16px; display: grid; gap: 2px; align-content: start; }
.tile-stat .lbl { font-size: 0.85rem; color: var(--pencil); font-weight: 600; }
.tile-stat .val { font-size: 2rem; font-weight: 700; line-height: 1.1; font-variant-numeric: tabular-nums; }
.tile-stat.big .val { font-size: 3.2rem; }
.tile-stat .sub { font-size: 0.8rem; color: var(--pencil); }
.tile-stat .sub.up { color: var(--done); font-weight: 600; }
.tile-stat .sub.down { color: var(--danger); font-weight: 600; }
.chart-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 16px; }
.chart-row.three { grid-template-columns: 1fr 1fr 1fr; }
.usage > .sheet { margin-bottom: 16px; }
.chart-card h3 { font-size: 1.2rem; }
.chart-body { margin-top: 10px; }
.chart { position: relative; }
.chart svg { width: 100%; height: auto; display: block; overflow: visible; }
.chart svg:focus-visible { outline-offset: 4px; }
.axes line { stroke: var(--rule); stroke-width: 1; }
.axes text, .end-label { fill: var(--pencil); font-size: 11px; font-family: var(--body); }
.col .mark { fill: var(--chart); }
.col .hit { fill: transparent; }
.col:hover .mark, .col:focus .mark { fill: color-mix(in srgb, var(--chart) 75%, var(--card)); }
.col:focus { outline: none; }
.wash { fill: var(--chart); opacity: 0.1; }
.line { fill: none; stroke: var(--chart); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.dot { fill: var(--chart); stroke: var(--card); stroke-width: 2; }
.cross { stroke: var(--pencil); stroke-width: 1; }
.chart-tip { position: absolute; transform: translate(-50%, calc(-100% - 10px)); background: var(--ink); color: var(--paper); padding: 5px 9px; border-radius: 4px; font-size: 0.8rem; pointer-events: none; display: grid; white-space: nowrap; z-index: 2; }
.chart-tip b { font-size: 0.95rem; }
.chart-tip span { opacity: 0.8; }
.table-view { margin-top: 6px; }
.table-view summary { color: var(--pen); }
.table-view table { margin-top: 6px; max-width: 280px; }
.hbars { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.hbars li { display: grid; grid-template-columns: minmax(90px, 38%) 1fr auto; gap: 10px; align-items: center; font-size: 0.875rem; }
.hb-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hb-track { display: block; height: 14px; }
.hb-bar { display: block; height: 100%; background: var(--chart); border-radius: 0 4px 4px 0; }
.hbars li:hover .hb-bar { background: color-mix(in srgb, var(--chart) 75%, var(--card)); }
.hb-val { font-weight: 700; font-variant-numeric: tabular-nums; min-width: 2.5ch; text-align: right; }
.empty { padding: 12px 0; }
@media (max-width: 900px) {
  .tiles { grid-template-columns: 1fr 1fr; }
  .tile-stat.big { grid-column: 1 / -1; }
  .chart-row, .chart-row.three { grid-template-columns: minmax(0, 1fr); }
  .axes text, .end-label { font-size: 18px; } /* the chart scales down on phones; keep axis text readable */
}