:root {
  --bg: #f6f1e7; --card: #fffdf8; --ink: #2b2622; --muted: #7b7168; --line: #e6dccb;
  --red: #c0392b; --red-soft: #f8e1dc; --jade: #2f7d63; --jade-soft: #dcefe6; --gold: #b8860b; --blue: #2c5d8a;
  --shadow: 0 1px 2px rgba(60, 40, 20, .06), 0 4px 14px rgba(60, 40, 20, .05);
  --hz: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #1d1a17; --card: #26221e; --ink: #eee6da; --muted: #a59a8d; --line: #3a342d; --red: #e0705f; --red-soft: #3d2622; --jade: #6cc3a0; --jade-soft: #1f3a30; --gold: #e0b44a; --blue: #8cb8e0; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.5 "Segoe UI", system-ui, var(--hz); }
button, input, select, textarea { font: inherit; color: inherit; }
.muted { color: var(--muted); } .pad { padding: 20px; }
small { font-size: .8em; color: var(--muted); font-weight: normal; }

.top { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; padding: 12px 20px; background: var(--card); border-bottom: 1px solid var(--line); }
.brand { display: flex; gap: 10px; align-items: center; }
.brand b { display: block; font-size: 1.1em; } .brand small { display: block; }
.seal { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 8px; background: var(--red); color: #fff; font: 700 22px var(--hz); transform: rotate(-4deg); }
.clocks { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; }
.clock { display: flex; flex-direction: column; align-items: center; line-height: 1.15; padding: 4px 10px; border: 1px solid var(--line); border-radius: 10px; }
.clock b { font-size: 1.35em; font-variant-numeric: tabular-nums; }
.dot { font-size: .85em; color: var(--muted); } .dot.ok { color: var(--jade); font-weight: 600; }

.tabs { display: flex; gap: 4px; padding: 0 16px; background: var(--card); border-bottom: 1px solid var(--line); overflow-x: auto; position: sticky; top: 0; z-index: 5; }
.tabs button { border: 0; background: none; padding: 10px 14px; cursor: pointer; border-bottom: 3px solid transparent; white-space: nowrap; }
.tabs button.on { border-color: var(--red); font-weight: 600; }
main { max-width: 1100px; margin: 0 auto; padding: 18px 16px 60px; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; margin-bottom: 14px; box-shadow: var(--shadow); }
.card h2, .card h3 { margin: 0 0 8px; } .card h4 { margin: 18px 0 6px; color: var(--red); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; align-items: start; }
@media (max-width: 760px) { .grid2 { grid-template-columns: 1fr; } }
.kicker { margin: 0; text-transform: uppercase; letter-spacing: .08em; font-size: .75em; color: var(--red); font-weight: 700; }
.hz { font-family: var(--hz); }
.next h2 .hz { font-size: 1.6em; }
.tip { font-size: .87em; color: var(--muted); background: var(--bg); border-radius: 8px; padding: 6px 10px; }
.warn { color: var(--red); }

button, .btn { cursor: pointer; border: 1px solid var(--line); background: var(--card); border-radius: 9px; padding: 7px 12px; display: inline-block; }
button:hover, .btn:hover { border-color: var(--muted); }
button:disabled { opacity: .45; cursor: default; }
button.primary { background: var(--red); border-color: var(--red); color: #fff; font-weight: 600; }
button.good { background: var(--jade); border-color: var(--jade); color: #fff; } button.bad { background: var(--red-soft); }
button.ghost { background: none; border-color: transparent; color: var(--muted); }
.btns { display: flex; gap: 8px; flex-wrap: wrap; margin: 10px 0; } .btns.center { justify-content: center; }
.spk { border: 0; background: none; padding: 2px 4px; font-size: .95em; }

.stats { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin-bottom: 8px; }
.stats div { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 10px; text-align: center; }
.stats b { display: block; font-size: 1.6em; line-height: 1.1; } .stats span { font-size: .78em; color: var(--muted); }
@media (max-width: 760px) { .stats { grid-template-columns: repeat(3, 1fr); } }
.progress { height: 8px; background: var(--line); border-radius: 9px; overflow: hidden; margin-bottom: 16px; }
.progress i { display: block; height: 100%; background: linear-gradient(90deg, var(--red), var(--gold)); }

.plan { padding: 0; list-style: none; margin: 12px 0; }
.plan li { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px dashed var(--line); }
.hours { display: grid; grid-template-columns: repeat(24, 1fr); gap: 2px; margin-top: 6px; }
.hours i { height: 16px; background: var(--line); border-radius: 3px; } .hours i.g { background: var(--jade); }
.hours-lbl { display: flex; justify-content: space-between; font-size: .72em; color: var(--muted); }
label.hw { display: block; padding: 4px 0; } label.check { display: block; margin: 10px 0; }

.toggles { display: flex; gap: 16px; font-size: .88em; color: var(--muted); flex-wrap: wrap; }
.words { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; }
.word { border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; display: grid; grid-template-columns: auto 1fr; column-gap: 4px; }
.word .spk { grid-row: span 3; align-self: start; }
.word .hz { font-size: 1.5em; line-height: 1.2; } .word .py { color: var(--red); } .word .en { font-size: .85em; color: var(--muted); }
.line { display: flex; gap: 6px; align-items: flex-start; padding: 6px 0; border-bottom: 1px dashed var(--line); }
.line .hz { display: block; font-size: 1.25em; } .line .py { display: block; color: var(--red); } .line .en { display: block; color: var(--muted); font-size: .9em; }
.who { font-weight: 700; color: var(--blue); min-width: 1.2em; padding-top: 4px; }
.no-py .py, .no-en .en { visibility: hidden; }
.no-py .py::before, .no-en .en::before { content: none; }
.gram { border-left: 3px solid var(--gold); padding: 4px 12px; margin: 8px 0; }
.gram p { margin: 4px 0; } .tipzh { font-size: .9em; color: var(--jade); }
.qs li { margin: 4px 0; }
.phrases div { display: flex; gap: 8px; align-items: baseline; padding: 4px 0; flex-wrap: wrap; } .phrases span { color: var(--muted); }
details.te { margin-top: 16px; border: 1px dashed var(--line); border-radius: 10px; padding: 8px 12px; }
details.te summary { cursor: pointer; color: var(--blue); }

.field { display: block; margin: 10px 0; font-size: .9em; color: var(--muted); }
.field input, .field textarea, .field select { display: block; width: 100%; margin-top: 4px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--ink); }
.field .row { display: flex; gap: 8px; align-items: center; } .field .row input { width: 80px; }

.session { border: 2px solid var(--red); }
.sess-head { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; border-bottom: 1px solid var(--line); padding-bottom: 12px; margin-bottom: 8px; }
.phases { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.phases button { font-size: .88em; } .phases button.on { background: var(--red); color: #fff; border-color: var(--red); } .phases button.past { opacity: .55; }
.timer { text-align: right; } .timer b { font-size: 2.6em; font-variant-numeric: tabular-nums; line-height: 1; display: block; }
.timer b.soon { color: var(--gold); } .timer b.over { color: var(--red); }
.timer .btns { justify-content: flex-end; }

.flash { text-align: center; padding: 18px 0; }
.flash .face { display: flex; flex-direction: column; align-items: center; gap: 4px; margin: 14px 0; }
.flash .back { padding-top: 14px; border-top: 1px dashed var(--line); }
.flash .big { font-size: 2em; } .flash .hz.big { font-size: 3em; } .flash .py { color: var(--red); font-size: 1.2em; }
.flash.empty p { color: var(--muted); }

.lessons { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }
.lesson { display: flex; gap: 14px; margin: 0; }
.ln { font: 700 1.8em Georgia, serif; color: var(--red); min-width: 1.4em; }
.lesson h3 { font-size: 1.25em; margin: 0; }
.chips { display: flex; gap: 6px; margin-top: 8px; }
.chip.done { background: var(--jade-soft); border-color: var(--jade); } .chip.next { border-color: var(--red); color: var(--red); font-weight: 600; }

.seg { display: flex; gap: 6px; margin-bottom: 12px; flex-wrap: wrap; } .seg button.on { background: var(--ink); color: var(--card); }
.boxes { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.boxes div { text-align: center; border: 1px solid var(--line); border-radius: 8px; padding: 6px; } .boxes b { display: block; font-size: 1.3em; }
.tbl { width: 100%; border-collapse: collapse; } .tbl td, .tbl th { padding: 6px; border-bottom: 1px solid var(--line); text-align: left; } .tbl .py { color: var(--red); }

.logitem.hl { border-color: var(--jade); }
.lh { display: flex; justify-content: space-between; gap: 8px; flex-wrap: wrap; }
.badge { font-size: .78em; border-radius: 99px; padding: 2px 8px; background: var(--bg); border: 1px solid var(--line); }
.badge.live { background: var(--red-soft); } .badge.async { background: var(--jade-soft); }
.note pre { white-space: pre-wrap; font: inherit; margin: 4px 0 8px; padding: 6px 10px; background: var(--bg); border-radius: 8px; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: var(--ink); color: var(--card); padding: 10px 16px; border-radius: 10px; max-width: 90vw; box-shadow: var(--shadow); z-index: 20; }

/* stages, pinyin/character parts, tests, stroke animation */
h2.stage { margin: 26px 0 2px; font-size: 1.25em; }
.lessons.locked { opacity: .6; }
.word { position: relative; }
.word .wr { position: absolute; top: 4px; right: 4px; }
.word .lbl { font-weight: 700; font-size: 1.15em; }
.word .glyph { font-size: 2em; line-height: 1.1; }
.hz.ink { color: var(--ink); }
.drill { display: grid; gap: 4px; font-size: 1.25em; color: var(--red); }
.drill div { padding: 4px 10px; background: var(--bg); border-radius: 8px; }
.pyq { color: var(--red); font-weight: 600; }
.flash .pyq.big { font-size: 2.6em; }
.cp { display: grid; grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 8px; }
.cpi { border: 1px solid var(--line); border-radius: 10px; padding: 8px; display: flex; flex-direction: column; align-items: center; gap: 4px; }
.cpi b { font-size: 1.6em; }
.cpi .ans { opacity: .15; transition: opacity .2s; } .cpi:hover .ans { opacity: 1; }
.cpi span { display: flex; gap: 6px; } .cpi button { padding: 2px 12px; }
.cpi.ok { background: var(--jade-soft); border-color: var(--jade); } .cpi.no { background: var(--red-soft); border-color: var(--red); }
.score { font-size: 1.1em; } .score.pass { color: var(--jade); }
#writer { position: fixed; inset: 0; background: rgba(0, 0, 0, .45); display: grid; place-items: center; z-index: 30; }
.wbox { background: var(--card); border-radius: 16px; padding: 14px 18px; width: min(320px, 92vw); text-align: center; }
.wh { display: flex; justify-content: space-between; align-items: center; gap: 8px; } .wh .hz { font-size: 1.6em; }
#wtarget { width: 240px; height: 240px; margin: 8px auto; background: var(--bg); border-radius: 10px; }
.wbox.wide { width: min(560px, 94vw); text-align: left; } .wbox textarea { width: 100%; margin-top: 8px; background: var(--bg); color: var(--ink); border: 1px solid var(--line); border-radius: 8px; padding: 8px; }

/* teacher metrics */
:root { --m3: #2f7d63; --m2: #6fb59a; --m1: #bfe0d2; --m0: var(--line); }
@media (prefers-color-scheme: dark) { :root { --m3: #6cc3a0; --m2: #3f8a6e; --m1: #28503f; } }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
@media (max-width: 900px) { .grid3 { grid-template-columns: 1fr; } }
.bench.cur { border-color: var(--red); }
.bi { display: grid; grid-template-columns: 1fr auto; gap: 2px 8px; padding: 8px 0; border-bottom: 1px dashed var(--line); }
.bl small, .ml small { display: block; } .bv { text-align: right; } .bv b { font-size: 1.2em; }
.meter { grid-column: 1 / -1; height: 8px; background: var(--line); border-radius: 6px; overflow: hidden; }
.meter i { display: block; height: 100%; background: var(--m3); border-radius: 0 4px 4px 0; }
.st { grid-column: 1 / -1; font-size: .82em; } .st.ok { color: var(--jade); } .st.wait { color: var(--muted); }
.okc { color: var(--jade); } .warnc { color: var(--gold); }
.mrow { display: grid; grid-template-columns: 9em 1fr 6.5em; gap: 8px; align-items: center; padding: 6px 0; }
.mbar { display: flex; gap: 2px; height: 14px; }
.mbar i { display: block; height: 100%; border-radius: 3px; min-width: 3px; }
.m3 { background: var(--m3); } .m2 { background: var(--m2); } .m1 { background: var(--m1); } .m0 { background: transparent; box-shadow: inset 0 0 0 1px var(--line); }
.mv { text-align: right; font-variant-numeric: tabular-nums; }
@media (max-width: 520px) { .mrow { grid-template-columns: 1fr 5.5em; } .mbar { grid-column: 1 / -1; grid-row: 2; } }
.legend { display: flex; flex-wrap: wrap; gap: 12px; font-size: .8em; color: var(--muted); margin-top: 8px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 4px; vertical-align: -1px; }
.legend i.gl { height: 0; border-top: 2px dashed var(--muted); width: 14px; border-radius: 0; }
.weeks { position: relative; display: grid; grid-template-columns: repeat(8, 1fr); gap: 6px; height: 148px; }
.wk { display: flex; flex-direction: column; justify-content: flex-end; align-items: center; height: 100%; cursor: default; }
.wk small { font-size: .7em; height: 18px; line-height: 18px; margin-top: 4px; white-space: nowrap; }
.wcol { height: 126px; flex: none; width: 60%; display: flex; flex-direction: column-reverse; }
.wcol .wl { border-bottom: 2px solid var(--card); }
.wcol i { display: block; width: 100%; border-radius: 4px 4px 0 0; box-sizing: border-box; }
.wl { background: var(--red); } .wa { background: var(--m2); }
.wk:hover .wcol { outline: 2px solid var(--line); outline-offset: 2px; border-radius: 4px; }
.goal { position: absolute; left: 0; right: 0; border-top: 2px dashed var(--muted); pointer-events: none; }
.goal span { position: absolute; right: 0; top: -16px; font-size: .7em; color: var(--muted); }
.row.mock { display: flex; gap: 6px; flex-wrap: wrap; } .row.mock input { width: 9em; padding: 6px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); color: var(--ink); }