@font-face {
  font-family: "Inter";
  src: url("../fonts/inter-latin-wght.woff2") format("woff2-variations"), url("../fonts/inter-latin-wght.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
}
:root {
  --canvas: #f1ecff;
  --panel: #ffffff;
  --panel-2: #fbf9ff;
  --ink: #241b35;
  --ink-2: #4a3f5e;
  --muted: #6c6280;
  --line: #e8e1f2;
  --line-2: #d9ccec;
  --accent: #6d3fc0;
  --accent-deep: #4f2b91;
  --accent-wash: #f4eeff;
  --p0: #faf8ff; --p1: #eee7fb; --p2: #ddcff7; --p3: #c0a7ee; --p4: #9871dc;
  --danger: #a3213f;
  --danger-wash: #fbecef;
  --shadow: 0 22px 60px rgba(70, 45, 110, .12);
  --radius: 24px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --suit: Georgia, "Times New Roman", serif;

  /* Course identity: soft tint + matching ink, used in the class schedule
     and as a small marker beside course names everywhere. */
  --c0-bg: #f1e4f7; --c0-ink: #5d2a78; --c0-edge: #b98bd0;
  --c1-bg: #e4e7fb; --c1-ink: #2e3a8c; --c1-edge: #8e98e0;
  --c2-bg: #dcefec; --c2-ink: #1d5e57; --c2-edge: #7fbcb2;
  --c3-bg: #f8ecd4; --c3-ink: #74460c; --c3-edge: #d9ae63;
  --c4-bg: #f9e2e7; --c4-ink: #8a2540; --c4-edge: #de8ea1;
  --c5-bg: #e9eed9; --c5-ink: #465717; --c5-edge: #a9ba74;
  --c6-bg: #e5e9ef; --c6-ink: #34404f; --c6-edge: #9aa6b6;

  color-scheme: light;
  accent-color: var(--accent);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh; background: var(--canvas); color: var(--ink);
  font: 14px/1.45 var(--font); font-variant-numeric: tabular-nums;
  scrollbar-color: var(--p3) transparent;
}
::selection { background: var(--p2); color: var(--ink); }
button, input { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }
a { color: var(--accent-deep); text-underline-offset: 3px; }

.shell { max-width: 1480px; margin: 36px auto; padding: 0 24px 48px; }
.panel { background: var(--panel); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }

/* Header */
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 18px 30px; border-bottom: 1px solid var(--line); }
.controls { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; justify-content: flex-end; }
h1 { font-size: 30px; line-height: 1.1; margin: 0; letter-spacing: -.025em; font-weight: 800; }
.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; }

.switch { display: inline-flex; padding: 4px; gap: 2px; background: var(--p1); border-radius: 12px; flex: none; }
.switch button {
  border: 0; background: transparent; padding: 8px 16px; border-radius: 9px; cursor: pointer;
  font-weight: 700; font-size: 13px; color: var(--muted);
  transition: background-color .18s ease, color .18s ease, box-shadow .18s ease;
}
.switch button:hover { color: var(--accent-deep); }
.switch button[aria-selected="true"] { background: var(--panel); color: var(--accent-deep); box-shadow: 0 2px 8px rgba(79, 43, 145, .14); }

.sync-line { margin: 0; font-size: 12px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 4px 16px; }
.sync-line .src { white-space: nowrap; }
.sync-line .src b { color: var(--ink-2); font-weight: 700; }
.sync-line .src.err { color: var(--danger); }
.sync-line .src.run { color: var(--accent-deep); }
.actions, .inline { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

.btn {
  border: 1px solid var(--line-2); background: var(--panel); color: var(--accent-deep);
  border-radius: 10px; padding: 8px 13px; font-weight: 700; font-size: 13px; cursor: pointer; line-height: 1.2;
  transition: background-color .15s ease, border-color .15s ease;
}
a.btn { display: inline-block; text-decoration: none; }
.btn:hover { background: #f6f1ff; }
.btn:active { background: var(--p1); }
.btn:disabled { opacity: .5; cursor: default; background: var(--panel); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-deep); border-color: var(--accent-deep); }
.btn.primary:disabled { background: var(--accent); }
.btn.quiet { border-color: transparent; background: transparent; }
.btn.quiet:hover { background: var(--accent-wash); }
.btn.danger { color: var(--danger); }
.btn.danger:hover { background: var(--danger-wash); }
.btn[aria-busy="true"] { cursor: progress; }

/* Settings */
.settings { padding: 18px 30px 22px; background: var(--panel-2); border-bottom: 1px solid var(--line); }
.settings-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px 32px; }
.setting label:not(.check), .setting-label { display: block; font-size: 12px; font-weight: 700; color: var(--ink-2); margin-bottom: 6px; }
.check { display: flex; gap: 8px; align-items: flex-start; font-weight: 700; font-size: 13px; cursor: pointer; }
.check input { margin-top: 3px; }
.hint { margin: 6px 0 0; font-size: 12px; color: var(--muted); max-width: 60ch; }
.setting .field-label { margin-top: 12px; }
.modes { border: 0; padding: 0; margin: 12px 0 0; display: grid; gap: 8px; }
.modes .check { font-weight: 700; flex-wrap: wrap; }
.hint-inline { display: block; flex-basis: 100%; margin-left: 24px; margin-top: -2px; font-weight: 400; font-size: 12px; color: var(--muted); }
.setting > input[type=text], #endpointRow input, .setting > select { width: 100%; }
.settings select { border: 1px solid var(--line-2); border-radius: 10px; padding: 7px 10px; background: var(--panel); }
.settings input[type=password], .settings input[type=text] {
  border: 1px solid var(--line-2); border-radius: 10px; padding: 8px 10px; min-width: 0; flex: 1; background: var(--panel);
}

.notice {
  margin: 0; padding: 11px 30px; font-size: 13px; background: var(--accent-wash); color: var(--accent-deep);
  border-bottom: 1px solid var(--line); display: flex; gap: 12px; align-items: center; flex-wrap: wrap;
}
.notice.err { background: var(--danger-wash); color: var(--danger); }
.notice .btn { padding: 5px 10px; }

/* Empty */
.empty { padding: 72px 30px 84px; max-width: 640px; }
.empty h2 { margin: 0 0 10px; font-size: 22px; letter-spacing: -.015em; }
.empty p { margin: 0 0 22px; color: var(--ink-2); max-width: 60ch; }

/* AI strip */
.ai-strip {
  margin: 14px 30px 0; padding: 10px 14px; border-radius: 12px; background: var(--panel-2);
  border: 1px dashed var(--p3); font-size: 12.5px; color: var(--ink-2);
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.ai-text { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.ai-strip .err { color: var(--danger); }
.ai-strip b { color: var(--accent-deep); }

/* Sources to read (approval) */
.sources { margin: 14px 30px 0; padding: 16px 18px 18px; border-radius: 12px; background: var(--panel-2); border: 1px solid var(--line-2); }
.src-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 12px; }
.src-top h2 { margin: 0; font-size: 15px; letter-spacing: -.01em; }
.src-top p { margin: 3px 0 0; font-size: 12.5px; color: var(--ink-2); max-width: 70ch; }
.src-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 10px 24px; }
.src-course ul { list-style: none; margin: 0; padding: 0; }
.src-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; border-bottom: 1px solid var(--line); padding-bottom: 4px; margin-bottom: 4px; }
.src-head h3 { margin: 0; font-size: 13px; font-weight: 800; display: flex; align-items: center; gap: 7px; }
.src-item { display: grid; grid-template-columns: 18px 1fr auto; column-gap: 8px; row-gap: 1px; padding: 6px 0; font-size: 12.5px; cursor: pointer; }
.src-item input { grid-row: span 2; margin-top: 2px; }
.src-name { font-weight: 700; overflow-wrap: anywhere; }
.src-meta { color: var(--muted); font-size: 11.5px; white-space: nowrap; }
.src-why { grid-column: 2 / 4; color: var(--muted); font-size: 12px; }
.src-item.off { cursor: default; }
.src-item.off .src-name { color: var(--muted); font-weight: 600; }
.src-why a { font-weight: 700; }
.src-item.off .src-why { color: var(--ink-2); }
.src-none { font-size: 12px; color: var(--muted); padding: 6px 0; }
.btn.small { padding: 5px 10px; font-size: 12px; }
.ai-strip .inline { flex: none; }

/* Semester matrix */
.matrix-wrap { overflow-x: auto; padding: 16px 30px 12px; }
.matrix { display: grid; align-items: stretch; }
.corner { height: 28px; }
.month-label { height: 28px; font-size: 12px; font-weight: 750; color: var(--ink-2); display: flex; align-items: center; padding-left: 8px; border-left: 1px solid var(--line); }
.week-label {
  height: 42px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); border-left: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center; text-align: center; font-size: 11px; line-height: 1.2; color: var(--muted); background: #fcfbfe;
}
.week-label.current { color: var(--accent); font-weight: 800; background: #f5f0ff; }
.course-label {
  height: 58px; border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 800; letter-spacing: .01em; padding-right: 12px; position: sticky; left: 0; background: var(--panel); z-index: 2;
}
.dot { width: 8px; height: 8px; border-radius: 3px; flex: none; }
.cell {
  height: 58px; border-left: 1px solid var(--line); border-bottom: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center; cursor: pointer; position: relative; outline: none;
  transition: box-shadow .12s ease;
}
.cell:hover { z-index: 3; box-shadow: inset 0 0 0 2px var(--p4); }
.cell:focus-visible { z-index: 3; box-shadow: inset 0 0 0 2px var(--accent-deep); }
.cell.current::after { content: ""; position: absolute; inset: 4px; border: 1.5px solid rgba(109, 63, 192, .35); border-radius: 7px; pointer-events: none; }
.cell.guess::before { content: ""; position: absolute; inset: 7px; border: 1.5px dashed rgba(79, 43, 145, .45); border-radius: 6px; pointer-events: none; }
.load0 { background: var(--p0); } .load1 { background: var(--p1); } .load2 { background: var(--p2); } .load3 { background: var(--p3); } .load4 { background: var(--p4); }
.marks { font-family: var(--suit); color: #4f2b91; font-size: 18px; letter-spacing: 1px; text-shadow: 0 1px 0 rgba(255, 255, 255, .7); }
.load4 .marks { color: #fff; text-shadow: none; }

.matrix-foot { display: flex; justify-content: space-between; gap: 14px 24px; align-items: center; padding: 6px 30px 18px; color: var(--muted); font-size: 12px; flex-wrap: wrap; }
.legend { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px 16px; }
.legend li { white-space: nowrap; color: #665d78; }
.legend b { font-family: var(--suit); color: var(--accent); font-size: 15px; margin-right: 5px; font-weight: 400; }
.load-scale { display: flex; align-items: center; gap: 6px; white-space: nowrap; }
.swatch { width: 18px; height: 10px; border-radius: 3px; border: 1px solid var(--line); }

.undated { margin: 0 30px 26px; font-size: 12.5px; color: var(--ink-2); border-top: 1px solid var(--line); padding-top: 12px; }
.undated summary { cursor: pointer; color: var(--muted); }
.undated summary:hover { color: var(--accent-deep); }
.undated ul { margin: 10px 0 0; padding: 0; list-style: none; columns: 3 220px; column-gap: 28px; }
.undated li { break-inside: avoid; padding: 2px 0; }
.undated li b { font-weight: 700; margin-right: 6px; }

/* Weekly workload */
.week-head { display: flex; justify-content: space-between; gap: 16px; align-items: center; padding: 14px 30px 12px; border-bottom: 1px solid var(--line); }
.week-left { display: flex; align-items: center; gap: 14px; min-width: 0; }
.week-title { font-size: 18px; font-weight: 800; letter-spacing: -.01em; margin: 0; }
.focus-note { margin: 2px 0 0; font-size: 12px; color: var(--muted); }
.focus-note:empty { display: none; }
.week-nav { display: flex; gap: 8px; flex-wrap: wrap; }
.weekly-wrap { overflow-x: auto; padding: 12px 30px 20px; }
.weekly-grid { display: grid; grid-template-columns: 116px repeat(7, minmax(126px, 1fr)); min-width: 1040px; border-top: 1px solid var(--line); border-right: 1px solid var(--line); }
.day-head { min-height: 42px; border-left: 1px solid var(--line); border-bottom: 1px solid var(--line); display: flex; flex-direction: column; align-items: center; justify-content: center; background: #fcfbfe; }
.day-head .dow { font-size: 12px; color: var(--muted); }
.day-head .date { font-size: 13px; font-weight: 800; margin-top: 1px; }
.day-head.today { background: var(--accent-wash); }
.day-head.today .date { color: var(--accent); }
.lane-label { min-height: var(--lane-h, 94px); border-left: 1px solid var(--line); border-bottom: 1px solid var(--line); display: flex; align-items: flex-start; gap: 7px; padding: 9px 10px; font-size: 12px; font-weight: 800; background: var(--panel); position: sticky; left: 0; z-index: 2; }
.lane-label .dot { margin-top: 4px; }
.lane-label.focused { background: var(--accent-wash); color: var(--accent-deep); box-shadow: inset 0 1px 0 var(--p3), inset 0 -1px 0 var(--p3); }
.day-cell { min-height: var(--lane-h, 94px); border-left: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 4px; background: var(--panel); display: flex; flex-direction: column; gap: 4px; }
.day-cell.focused { background: var(--accent-wash); box-shadow: inset 0 1px 0 var(--p3), inset 0 -1px 0 var(--p3); }
.item {
  display: block; width: 100%; text-align: left; border: 1px solid #ded2ef; background: #f4eeff; border-radius: 9px;
  padding: 4px 7px; line-height: 1.22; box-shadow: 0 2px 6px rgba(80, 50, 120, .06); cursor: pointer; color: inherit; text-decoration: none;
}
.item:hover { border-color: var(--p3); }
.item-time { font-size: 10.5px; color: var(--muted); font-weight: 800; margin-bottom: 1px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.item-time .sym { font-family: var(--suit); font-weight: 400; margin-right: 3px; color: var(--accent); }
.item-title { font-size: 11.5px; color: var(--ink); font-weight: 700; overflow-wrap: anywhere; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.item.guess { border: 1.5px dashed var(--p4); background: var(--panel); }
.item.guess .item-time::after { content: " · from syllabus"; font-weight: 600; color: var(--accent); }
.item.done { background: var(--panel-2); border-color: var(--line); }
.item.done .item-time, .item.done .item-title { color: var(--muted); }
.item.done .item-title { text-decoration: line-through; text-decoration-color: var(--muted); }
.item .state { font-weight: 700; }
.item .state.missing { color: var(--danger); }
.week-empty { padding: 0 30px 30px; margin: 0; color: var(--muted); font-size: 13px; }

/* Class schedule */
.sched-wrap { overflow-x: auto; padding: 12px 30px 8px; }
.sched-grid { display: grid; grid-template-columns: 56px repeat(var(--days, 5), minmax(150px, 1fr)); min-width: 820px; position: relative; }
.sched-corner { border-bottom: 1px solid var(--line); }
.sched-day { border-bottom: 1px solid var(--line); border-left: 1px solid var(--line); padding: 9px 10px; background: #fcfbfe; }
.sched-day .dow { font-size: 12px; color: var(--muted); }
.sched-day .date { font-size: 13px; font-weight: 800; }
.sched-day.today { background: var(--accent-wash); }
.sched-day.today .date { color: var(--accent); }
.sched-day .closed-label { display: block; font-size: 11.5px; color: var(--ink-2); margin-top: 1px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sched-col.closed { background-color: var(--panel-2); }
.closed-note { position: absolute; top: 10px; left: 0; right: 0; margin: 0; text-align: center; font-size: 12px; color: var(--muted); }
.hours { position: relative; }
.hour { position: absolute; right: 8px; font-size: 11px; color: var(--muted); transform: translateY(-50%); white-space: nowrap; }
.hour.first { transform: translateY(2px); }
.sched-col { position: relative; border-left: 1px solid var(--line); background-image: linear-gradient(to bottom, var(--line) 1px, transparent 1px); background-size: 100% var(--hour-px); }
.sched-col.today { background-color: #fdfbff; }
.now-line { position: absolute; left: -1px; right: 0; height: 2px; background: var(--accent); z-index: 4; pointer-events: none; }
.now-line::before { content: ""; position: absolute; left: -4px; top: -3px; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.meeting {
  position: absolute; left: 5px; right: 5px; border-radius: 10px; padding: 6px 9px; overflow: hidden;
  border: 1px solid transparent; font-size: 11.5px; line-height: 1.3; cursor: default; z-index: 2;
}
.meeting .m-code { font-weight: 800; font-size: 12.5px; }
.meeting .m-meta { opacity: .88; }
.meeting.cancelled { background: var(--panel-2); border: 1px solid var(--line-2); color: var(--muted); }
.meeting.cancelled .m-code { text-decoration: line-through; }
.meeting .m-meta, .meeting .m-code { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.meeting.mid { padding: 4px 8px; }
.meeting.one { padding: 2px 8px; display: flex; align-items: center; }
.meeting.one .m-code { font-size: 12px; }
.meeting.one .m-meta { font-weight: 600; }
.c0 { background: var(--c0-bg); color: var(--c0-ink); border-color: var(--c0-edge); } .dot.c0 { background: var(--c0-edge); }
.c1 { background: var(--c1-bg); color: var(--c1-ink); border-color: var(--c1-edge); } .dot.c1 { background: var(--c1-edge); }
.c2 { background: var(--c2-bg); color: var(--c2-ink); border-color: var(--c2-edge); } .dot.c2 { background: var(--c2-edge); }
.c3 { background: var(--c3-bg); color: var(--c3-ink); border-color: var(--c3-edge); } .dot.c3 { background: var(--c3-edge); }
.c4 { background: var(--c4-bg); color: var(--c4-ink); border-color: var(--c4-edge); } .dot.c4 { background: var(--c4-edge); }
.c5 { background: var(--c5-bg); color: var(--c5-ink); border-color: var(--c5-edge); } .dot.c5 { background: var(--c5-edge); }
.c6 { background: var(--c6-bg); color: var(--c6-ink); border-color: var(--c6-edge); } .dot.c6 { background: var(--c6-edge); }

.sched-changes { margin: 6px 30px 0; padding: 10px 14px; list-style: none; font-size: 12.5px; color: var(--ink-2); background: var(--panel-2); border-radius: 12px; border: 1px solid var(--line); }
.sched-changes li + li { margin-top: 3px; }
.sched-changes b { font-weight: 700; }

/* First-run tour */
.tour-spot {
  position: fixed; z-index: 900; border-radius: 12px; pointer-events: none;
  box-shadow: 0 0 0 2px var(--accent), 0 0 0 9999px rgba(36, 27, 53, .42);
}
.tour-card {
  position: fixed; z-index: 901; width: min(360px, calc(100vw - 24px)); background: var(--panel); color: var(--ink);
  border-radius: 12px; padding: 16px 18px 14px; box-shadow: 0 18px 44px rgba(36, 27, 53, .28);
  animation: tour-in .16s ease-out;
}
@keyframes tour-in { from { opacity: 0; transform: translateY(4px); } }
.tour-card h2 { margin: 2px 0 6px; font-size: 15px; letter-spacing: -.01em; }
.tour-card p { margin: 0; font-size: 13px; color: var(--ink-2); }
.tour-card .tour-count { font-size: 12px; color: var(--muted); }
.tour-actions { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-top: 14px; }

/* Tooltip */
.tooltip {
  position: fixed; z-index: 1000; max-width: 340px; background: #2d2340; color: #fff; border-radius: 12px; padding: 10px 12px;
  box-shadow: 0 12px 30px rgba(34, 22, 52, .28); pointer-events: none; opacity: 0; transform: translateY(4px);
  transition: opacity .08s ease, transform .08s ease; font-size: 12px; line-height: 1.42;
}
.tooltip.show { opacity: 1; transform: translateY(0); }
.tip-title { font-weight: 800; margin-bottom: 5px; }
.tip-line { color: #ece5f7; }
.tip-line .sym { font-family: var(--suit); }
.tip-meta { color: #cdbfe4; margin-top: 6px; font-size: 11px; }

@media (max-width: 900px) {
  .settings-grid { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .shell { padding: 0 10px 28px; margin: 12px auto; }
  .panel { border-radius: 18px; }
  .topbar { align-items: flex-start; flex-direction: column; padding: 22px 18px 10px; gap: 14px; }
  .switch { align-self: stretch; }
  .switch button { flex: 1; }
  .controls { align-self: stretch; flex-direction: column; align-items: stretch; }
  .actions { width: 100%; flex-wrap: nowrap; }
  .actions .btn { white-space: nowrap; padding: 8px 10px; }
  .actions .primary { flex: 1; }
  .actions .long { display: none; }
  .settings, .notice { padding-left: 18px; padding-right: 18px; }
  .matrix-wrap, .weekly-wrap, .sched-wrap { padding-left: 18px; padding-right: 18px; }
  .matrix-foot { padding-left: 18px; padding-right: 18px; flex-direction: column; align-items: flex-start; }
  .undated, .ai-strip, .sched-changes, .sources { margin-left: 18px; margin-right: 18px; }
  .src-top { flex-direction: column; }
  .week-head { padding: 16px 18px; align-items: flex-start; flex-direction: column; }
  .week-left { flex-direction: column; align-items: flex-start; }
  .week-nav { align-self: stretch; }
  .week-nav .btn { flex: 1 1 auto; white-space: nowrap; padding: 8px 10px; }
  .empty { padding: 44px 18px 52px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}