:root {
  --bg: #f5f6f8; --card: #fff; --ink: #151a22; --muted: #5f6b7a; --line: #e3e6eb; --soft: #eef1f4;
  --accent: #0f766e; --accent-ink: #fff; --accent-soft: #e0f2ef;
  --good: #15803d; --good-soft: #dcf5e4; --warn: #b45309; --warn-soft: #fdf0d5; --bad: #b42318; --bad-soft: #fde4e1;
  --radius: 18px;
  color-scheme: light; /* always light, even when the device is in dark mode */
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
h1, h2, h3 { margin: 0; line-height: 1.25; }
h1 { font-size: 22px; } h2 { font-size: 16px; } h3 { font-size: 14px; }
p { margin: 0; }
a { color: var(--accent); }
.muted { color: var(--muted); } .small { font-size: 13px; } .right { text-align: right; } .nowrap { white-space: nowrap; }
.num { font-variant-numeric: tabular-nums; }

/* layout */
.top { position: sticky; top: 0; z-index: 5; background: var(--card); border-bottom: 1px solid var(--line); }
.top-in { max-width: 1040px; margin: 0 auto; padding: 10px 16px 0; }
.brand { display: flex; align-items: center; gap: 10px; justify-content: space-between; }
.brand b { font-size: 16px; }
.nav { display: flex; gap: 2px; overflow-x: auto; margin: 8px -6px 0; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav button { flex: none; background: none; border: 0; border-bottom: 2px solid transparent; padding: 8px 10px 10px; color: var(--muted); font: inherit; font-weight: 600; cursor: pointer; }
.nav button.on { color: var(--accent); border-bottom-color: var(--accent); }
main { max-width: 1040px; margin: 0 auto; padding: 16px 16px 80px; display: grid; gap: 14px; }
.grid2 { display: grid; gap: 14px; grid-template-columns: 1fr; }
@media (min-width: 820px) { .grid2 { grid-template-columns: 1fr 1fr; } .span2 { grid-column: span 2; } }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; min-width: 0; }
.card > h2 { margin-bottom: 10px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.between { justify-content: space-between; }
.stack { display: grid; gap: 10px; }
.sep { border: 0; border-top: 1px solid var(--line); margin: 12px 0; }

/* controls */
button, input, select, textarea { font: inherit; color: inherit; }
.btn { background: var(--soft); border: 1px solid var(--line); border-radius: 10px; padding: 8px 14px; font-weight: 600; cursor: pointer; text-decoration: none; display: inline-block; color: var(--ink); }
.btn.pri { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.sm { padding: 5px 10px; font-size: 13px; }
.btn.ghost { background: none; }
.btn.danger { color: var(--bad); }
.btn:disabled { opacity: .5; cursor: default; }
input[type=text], input[type=number], input[type=date], input[type=time], input[type=url], input[type=password], select, textarea {
  background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; min-width: 0; max-width: 100%; }
textarea { width: 100%; min-height: 90px; resize: vertical; }
input:focus-visible, select:focus-visible, textarea:focus-visible, button:focus-visible, .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
label.f { display: grid; gap: 4px; font-size: 13px; color: var(--muted); font-weight: 600; }
.xbtn { background: none; border: 0; color: var(--muted); cursor: pointer; padding: 4px 8px; font-size: 16px; border-radius: 8px; }
.xbtn:hover { background: var(--soft); color: var(--bad); }

/* pieces */
.chip { display: inline-flex; align-items: center; gap: 6px; background: var(--soft); border-radius: 999px; padding: 3px 10px; font-size: 13px; font-weight: 600; white-space: nowrap; }
.chip.good { background: var(--good-soft); color: var(--good); } .chip.warn { background: var(--warn-soft); color: var(--warn); }
.chip.bad { background: var(--bad-soft); color: var(--bad); } .chip.acc { background: var(--accent-soft); color: var(--accent); }
.dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; flex: none; }
.big { font-size: 44px; font-weight: 750; line-height: 1; letter-spacing: -.02em; }
.stat b { display: block; font-size: 20px; } .stat span { font-size: 13px; color: var(--muted); }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: 12px; }
.bar { height: 8px; background: var(--soft); border-radius: 99px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--accent); border-radius: 99px; }
.weeks { display: grid; grid-template-columns: repeat(12, minmax(54px, 1fr)); gap: 6px; overflow-x: auto; padding-bottom: 4px; }
.wk { border: 1px solid var(--line); border-radius: 10px; padding: 6px 4px; text-align: center; font-size: 12px; min-width: 54px; }
.wk b { display: block; font-size: 15px; } .wk.now { border-color: var(--accent); background: var(--accent-soft); }
.wk.cp { border-style: dashed; } .wk .t { color: var(--muted); }
.wk.ok b { color: var(--good); } .wk.low b { color: var(--bad); }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { text-align: left; padding: 7px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 12px; color: var(--muted); font-weight: 600; }
tr.cp td { background: var(--soft); }
.scroll-x { overflow-x: auto; }
.list { display: grid; }
.list > .li { padding: 10px 0; border-bottom: 1px solid var(--line); }
.list > .li:last-child { border-bottom: 0; }
.empty { color: var(--muted); padding: 8px 0; }
svg.chart { width: 100%; height: auto; display: block; }
svg.chart text { fill: var(--muted); font-size: 11px; }
svg.chart .grid { stroke: var(--line); }
.legend { display: flex; gap: 12px; flex-wrap: wrap; font-size: 13px; margin-top: 6px; }
.legend span { display: inline-flex; align-items: center; gap: 6px; }

/* people */
.people { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; }
.person { border: 1px solid var(--line); border-radius: 12px; padding: 10px; background: none; text-align: left; cursor: pointer; }
.person b { display: flex; align-items: center; gap: 6px; }

/* availability */
.avday { padding: 8px 0; border-bottom: 1px solid var(--line); }
.avday:last-child { border-bottom: 0; }
.avrow { display: grid; grid-template-columns: 84px 1fr; gap: 8px; align-items: center; font-size: 12px; margin-top: 3px; }
.track { position: relative; height: 14px; background: var(--good-soft); border-radius: 4px; overflow: hidden; }
.track i { position: absolute; top: 0; bottom: 0; background: var(--muted); opacity: .75; }
.track i.sess { background: var(--accent); opacity: 1; }
.track.off { background: var(--soft); }
.hours { display: grid; grid-template-columns: 84px 1fr; gap: 8px; font-size: 11px; color: var(--muted); }
.hours div { display: flex; justify-content: space-between; }

/* plan */
details.unit { border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; background: var(--card); }
details.unit + details.unit { margin-top: 8px; }
details.unit > summary { cursor: pointer; list-style: none; display: flex; gap: 8px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
details.unit > summary::-webkit-details-marker { display: none; }
.topic { display: grid; grid-template-columns: auto 1fr auto; gap: 8px; align-items: center; padding: 7px 0; border-top: 1px solid var(--line); }
.tier { border: 0; border-radius: 6px; font-size: 11px; font-weight: 700; padding: 2px 6px; cursor: pointer; background: var(--soft); color: var(--muted); }
.tier.t1 { background: var(--accent); color: var(--accent-ink); } .tier.t2 { background: var(--accent-soft); color: var(--accent); }
.rag { display: inline-flex; gap: 4px; align-items: center; }
.rag button { width: 22px; height: 22px; border-radius: 50%; border: 2px solid var(--line); background: none; cursor: pointer; padding: 0; }
.rag button.r.on { background: var(--bad); border-color: var(--bad); } .rag button.a.on { background: var(--warn); border-color: var(--warn); } .rag button.g.on { background: var(--good); border-color: var(--good); }
.dots { display: inline-flex; gap: 3px; }
.dots i { width: 9px; height: 9px; border-radius: 50%; background: var(--soft); border: 1px solid var(--line); }
.dots i.c1 { background: var(--bad); border-color: var(--bad); } .dots i.c2 { background: var(--warn); border-color: var(--warn); } .dots i.c3 { background: var(--good); border-color: var(--good); }
.agenda { display: grid; gap: 8px; }
.agenda .step { display: grid; grid-template-columns: 64px 1fr; gap: 10px; }
.agenda .step > b { color: var(--accent); }

/* questions */
.opt { display: flex; gap: 10px; align-items: flex-start; width: 100%; text-align: left; border: 1px solid var(--line); background: var(--card); border-radius: 12px; padding: 10px 12px; cursor: pointer; margin-top: 8px; }
.opt.on { border-color: var(--accent); background: var(--accent-soft); }
.opt.correct { border-color: var(--good); background: var(--good-soft); }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.opt b { flex: none; width: 20px; }
.stem { white-space: pre-wrap; font-size: 16px; }
.qimg { max-width: 100%; border-radius: 10px; margin-top: 10px; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.seg button { border: 0; background: none; padding: 6px 12px; cursor: pointer; font-weight: 600; color: var(--muted); }
.seg button.on { background: var(--accent); color: var(--accent-ink); }
.qdots { display: flex; flex-wrap: wrap; gap: 4px; }
.qdots button { width: 28px; height: 28px; border-radius: 8px; border: 1px solid var(--line); background: none; cursor: pointer; font-size: 12px; }
.qdots button.done { background: var(--accent-soft); } .qdots button.cur { border-color: var(--accent); border-width: 2px; }

/* login */
.login { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login .card { width: 100%; max-width: 380px; text-align: center; padding: 28px 22px; }
.login input { width: 100%; text-align: center; font-size: 18px; margin: 14px 0 10px; }
.login .btn { width: 100%; }
.err { color: var(--bad); font-size: 13px; min-height: 20px; margin-top: 8px; }

#toast { position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 9px 16px; border-radius: 999px; font-size: 14px; opacity: 0; pointer-events: none; transition: opacity .2s; z-index: 20; max-width: 90vw; }
#toast.on { opacity: 1; }
@media (max-width: 520px) { .big { font-size: 38px; } .card { padding: 14px; } }

.timewrap { display: inline-flex; align-items: center; gap: 6px; }
.timehint { min-width: 62px; font-weight: 400; }

/* friendlier dashboard */
.card { box-shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 4px 16px rgba(16, 24, 40, .04); }
.avatar { display: inline-grid; place-items: center; border-radius: 50%; color: #fff; font-weight: 700; flex: none; }
.hero { display: flex; gap: 22px; align-items: center; flex-wrap: wrap; }
.hero-body { flex: 1; min-width: 230px; display: grid; gap: 8px; }
.ring { width: 150px; height: 150px; flex: none; margin: 0 auto; }
.ring-n { font-size: 26px; font-weight: 750; fill: var(--ink); }
.ring-l { font-size: 12px; fill: var(--muted); }
.lead { font-size: 17px; line-height: 1.4; }
.quick { background: var(--accent-soft); border-radius: 14px; padding: 10px 12px; margin-top: 4px; }
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; margin-top: 16px; }
.tile { background: var(--soft); border-radius: 14px; padding: 12px 14px; }
.tile b { display: block; font-size: 26px; line-height: 1.1; }
.tile span { font-size: 13px; color: var(--muted); }
.tile.good { background: var(--good-soft); } .tile.good b { color: var(--good); }
summary.more { cursor: pointer; color: var(--accent); font-weight: 600; font-size: 14px; padding: 6px 0; }
.person { transition: border-color .15s; } .person:hover { border-color: var(--accent); }
.person b { gap: 8px; }

.weekpage { border: 1px solid var(--line); border-radius: 14px; padding: 14px; }
.weekpage.now { border-color: var(--accent); }
.weekgoal { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; text-align: center; margin: 14px 0 12px; }
.weekgoal > div { display: grid; gap: 2px; }
.weekgoal b { font-size: 26px; line-height: 1.1; }

.gpeople { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 10px; }
.gperson { border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; }

.dayform { margin-top: 8px; gap: 8px; }
.dayform input[type=text] { padding: 5px 8px; }
.dayform .timehint { min-width: 0; }
.avday { padding: 12px 0; }

.myday { display: grid; grid-template-columns: 110px 1fr; gap: 10px; padding: 12px 0; border-top: 1px solid var(--line); align-items: start; }
.myday-name { display: grid; }
.myday-body { display: grid; gap: 2px; min-width: 0; }
.myday.past { opacity: .6; }
@media (max-width: 520px) { .myday { grid-template-columns: 1fr; gap: 4px; } .myday-name { display: flex; gap: 8px; align-items: baseline; } }

.p2unit { border-top: 1px solid var(--line); padding: 10px 0; display: grid; gap: 4px; }

/* exam-style test screen */
.exam { --exam: #1f3a5f; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--card); }
.exam-top, .exam-bot { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; padding: 10px 14px; }
.exam-top { background: var(--exam); color: #fff; }
.exam-name { margin-left: 10px; opacity: .75; font-size: 13px; }
.exam-flag { background: none; border: 1px solid rgba(255,255,255,.45); color: #fff; border-radius: 8px; padding: 5px 12px; cursor: pointer; font-weight: 600; }
.exam-flag.on { background: #f5c542; border-color: #f5c542; color: #1b1b1b; }
.exam-time b { font-size: 17px; margin-left: 6px; }
.exam-body { display: grid; grid-template-columns: 62px 1fr; min-height: 380px; }
.exam-nav { background: var(--soft); border-right: 1px solid var(--line); overflow-y: auto; max-height: 70vh; }
.exam-nav button { display: flex; align-items: center; justify-content: center; gap: 3px; width: 100%; padding: 8px 2px; border: 0; border-bottom: 1px solid var(--line); background: none; cursor: pointer; font-size: 13px; position: relative; color: var(--ink); }
.exam-nav button i { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); position: absolute; left: 6px; }
.exam-nav button span { color: #c98a00; font-size: 12px; }
.exam-nav button.cur { background: var(--exam); color: #fff; font-weight: 700; }
.exam-nav button.cur i { background: #fff; }
.exam-q { padding: 20px 22px; min-width: 0; }
.exam-q .stem { font-size: 16px; line-height: 1.6; }
.choices { margin-top: 18px; border: 1px solid var(--line); border-radius: 10px; padding: 6px; max-width: 760px; }
.choice { display: flex; align-items: stretch; border-radius: 8px; }
.choice + .choice { margin-top: 2px; }
.choice-main { flex: 1; display: flex; gap: 10px; align-items: flex-start; text-align: left; background: none; border: 0; padding: 9px 10px; cursor: pointer; border-radius: 8px; color: var(--ink); min-width: 0; }
.choice-main:hover { background: var(--soft); }
.choice .radio { flex: none; width: 16px; height: 16px; border: 2px solid var(--muted); border-radius: 50%; margin-top: 3px; }
.choice.on .radio { border-color: var(--exam); background: radial-gradient(circle, var(--exam) 45%, transparent 50%); }
.choice.on .choice-main { background: var(--accent-soft); }
.choice.struck .ctext, .choice.struck .choice-main b { text-decoration: line-through; opacity: .45; }
.choice-x { flex: none; width: 36px; background: none; border: 0; color: var(--muted); cursor: pointer; border-radius: 8px; }
.choice-x:hover { background: var(--soft); color: var(--ink); }
.exam-bot { border-top: 1px solid var(--line); background: var(--soft); }
.endgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 8px; }
.endgrid button { display: grid; gap: 2px; text-align: left; border: 1px solid var(--line); border-radius: 10px; background: var(--card); padding: 8px 10px; cursor: pointer; font-size: 13px; color: var(--ink); }
.endgrid button.un { border-color: var(--bad); } .endgrid button.un span { color: var(--bad); }
.endgrid .fl { color: #c98a00; }
@media (max-width: 640px) {
  .exam-body { grid-template-columns: 1fr; }
  .exam-nav { display: flex; overflow-x: auto; max-height: none; border-right: 0; border-bottom: 1px solid var(--line); }
  .exam-nav button { width: auto; min-width: 44px; border-bottom: 0; border-right: 1px solid var(--line); padding: 10px 8px; }
  .exam-nav button i { left: 4px; top: 6px; }
  .exam-q { padding: 16px 14px; }
}

.flow { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; }
.flow > div { background: var(--accent-soft); border-radius: 12px; padding: 10px 12px; display: grid; gap: 2px; }
.flow b { color: var(--accent); } .flow span { font-size: 13px; }

.savestate { color: var(--muted); font-size: 12px; margin-right: 6px; }
.savestate.saved::before { content: "✓ "; color: var(--good); }
.savestate.offline { color: var(--bad); font-weight: 600; }
@media (max-width: 520px) { .savestate.saved { display: none; } }

.meetcard { background: var(--accent-soft); border-color: var(--accent); }
.meetcard a:not(.btn) { color: var(--accent); font-weight: 600; word-break: break-all; }

.movednote { color: var(--warn); font-weight: 600; white-space: nowrap; }
.movedbox { background: var(--warn-soft); margin-bottom: 12px; border: 1px solid var(--warn); }