/* AUAU 同步练习：颜色取自 AUAU 蝴蝶标（蓝 #1F4FA8、橙 #FF7E54），只在少数地方用，做题页保持素净 */
:root {
  color-scheme: light;
  --blue: #1F4FA8;
  --blue-soft: #e9effa;
  --orange: #FF7E54;
  --orange-soft: #fff1eb;
  --bg: #f7f6f3;
  --card: #ffffff;
  --ink: #1f2328;
  --ink-2: #57606a;
  --ink-3: #8c959f;
  --line: #e7e3dc;
  --ok: #1f9d55;
  --ok-soft: #e7f6ed;
  --bad: #d64545;
  --bad-soft: #fdeceb;
  --warn: #9a6a12;
  --warn-soft: #fdf4e3;
  --radius: 16px;
  --safe-t: env(safe-area-inset-top, 0px);
  --safe-b: env(safe-area-inset-bottom, 0px);
  --safe-l: env(safe-area-inset-left, 0px);
  --safe-r: env(safe-area-inset-right, 0px);
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; background: var(--bg); color: var(--ink); }
body { font: 18px/1.6 -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; -webkit-text-size-adjust: 100%; min-height: 100vh; }
button, select, input, textarea { font: inherit; color: inherit; }
button { touch-action: manipulation; cursor: pointer; }
details summary { cursor: pointer; }

/* —— 顶栏：白底，只在首页放小蝴蝶 —— */
.top {
  position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.96); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  padding: calc(var(--safe-t) + 10px) calc(var(--safe-r) + 20px) 10px calc(var(--safe-l) + 20px);
  display: flex; align-items: center; gap: 12px; min-height: 60px;
}
.top h1 { font-size: 20px; margin: 0; font-weight: 700; flex: 1; min-width: 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--ink); }
.top .mark { width: 34px; height: 34px; flex: none; }
.top .brand { color: var(--blue); letter-spacing: .5px; }
.top .back { background: var(--blue-soft); border: 0; color: var(--blue); border-radius: 999px; min-width: 44px; height: 40px; padding: 0 14px; font-size: 16px; font-weight: 600; }
.top .sub { font-size: 14px; color: var(--ink-3); white-space: nowrap; }
.top .timer { font-variant-numeric: tabular-nums; font-weight: 700; color: var(--blue); font-size: 20px; }
.top .timer.low { color: var(--bad); }
.dot { display: inline-block; font-size: 12px; padding: 2px 8px; border-radius: 99px; background: var(--warn-soft); color: var(--warn); white-space: nowrap; }

main { max-width: 920px; margin: 0 auto; padding: 20px calc(var(--safe-r) + 20px) calc(var(--safe-b) + 48px) calc(var(--safe-l) + 20px); }
.card { background: var(--card); border-radius: var(--radius); padding: 18px 20px; border: 1px solid var(--line); }
.stack > * + * { margin-top: 14px; }
.muted { color: var(--ink-2); }
.small { font-size: 15px; }
.tiny { font-size: 13px; color: var(--ink-3); }
h2 { font-size: 18px; margin: 26px 0 10px; }
h2:first-child { margin-top: 0; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 52px; padding: 0 22px; border-radius: 14px; border: 0; background: var(--blue); color: #fff; font-weight: 600; font-size: 18px; }
.btn.ghost { background: var(--blue-soft); color: var(--blue); }
.btn.plain { background: #eef0f2; color: var(--ink); }
.btn.danger { background: var(--bad-soft); color: var(--bad); }
.btn.block { width: 100%; }
.btn.sm { min-height: 40px; font-size: 15px; padding: 0 14px; border-radius: 10px; }
.btn:disabled { opacity: .45; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.row.end { justify-content: flex-end; }
.grow { flex: 1; }

/* —— 登录 —— */
.login { max-width: 420px; margin: 8vh auto 0; text-align: center; }
.login img { width: 120px; height: 120px; }
.login h1 { color: var(--blue); font-size: 28px; margin: 6px 0 2px; letter-spacing: 1px; }
.codebox { font-size: 36px; letter-spacing: 12px; text-align: center; width: 100%; max-width: 300px; padding: 10px 0 10px 12px; border: 2px solid var(--line); border-radius: 14px; background: #fff; font-variant-numeric: tabular-nums; }
.codebox:focus { outline: none; border-color: var(--blue); }
.err { color: var(--bad); min-height: 1.6em; }

/* —— 首页 —— */
.hello { font-size: 22px; font-weight: 700; margin: 2px 0 0; }
.task { display: flex; gap: 18px; align-items: center; }
.task .num { font-size: 44px; font-weight: 800; color: var(--orange); line-height: 1; }
.subjects { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.subj { text-align: left; border: 1px solid var(--line); background: var(--card); border-radius: var(--radius); padding: 16px; display: flex; gap: 14px; align-items: center; min-height: 112px; width: 100%; }
.subj .cover { width: 60px; height: 80px; border-radius: 8px; flex: none; color: #fff; font-weight: 800; display: flex; align-items: center; justify-content: center; font-size: 19px; letter-spacing: 2px; writing-mode: vertical-rl; box-shadow: inset -6px 0 0 rgba(0,0,0,.12); }
.subj .name { font-size: 19px; font-weight: 700; }
.subj .meta { font-size: 14px; color: var(--ink-2); }
.subj.off { opacity: .6; }
.subj.off .cover { background: #b8bec5 !important; }
.ring { margin-left: auto; text-align: center; flex: none; }
.ring b { display: block; font-size: 22px; color: var(--blue); }
.ring span { font-size: 12px; color: var(--ink-3); }
.tiles { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.tiles .btn { flex-direction: column; gap: 2px; min-height: 64px; font-size: 16px; }

/* —— 目录 / 进度 —— */
.unit-title { font-size: 15px; color: var(--ink-2); font-weight: 600; margin: 22px 4px 8px; }
.lesson { width: 100%; text-align: left; display: flex; align-items: center; gap: 12px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; margin-bottom: 10px; min-height: 62px; }
.lesson .no { font-size: 14px; color: var(--ink-3); width: 56px; flex: none; }
.lesson .t { font-weight: 600; }
.lesson .pg { font-size: 13px; color: var(--ink-3); }
.lesson.todo { opacity: .6; }
.chips { margin-left: auto; display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.chip { flex: none; font-size: 13px; padding: 3px 9px; border-radius: 999px; background: #eef0f2; color: var(--ink-2); white-space: nowrap; }
.chip.ok { background: var(--ok-soft); color: var(--ok); }
.chip.go { background: var(--blue-soft); color: var(--blue); }
.chip.bad { background: var(--bad-soft); color: var(--bad); }
.chip.now { background: var(--orange-soft); color: #c4532d; }
.chip.none { background: transparent; color: var(--ink-3); border: 1px dashed var(--line); }
.seg { display: inline-flex; background: #eef0f2; border-radius: 12px; padding: 3px; gap: 3px; flex: none; }
.seg button { border: 0; background: transparent; padding: 8px 12px; border-radius: 9px; font-size: 15px; min-height: 40px; color: var(--ink-2); }
.seg button.on { background: #fff; color: var(--ink); font-weight: 700; box-shadow: 0 1px 2px rgba(0,0,0,.08); }
.seg button.on.now { color: #c4532d; }
.seg button.on.done { color: var(--ok); }
.prow { display: flex; align-items: center; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.prow:last-child { border-bottom: 0; }
select.sel { min-height: 44px; border-radius: 10px; border: 1px solid var(--line); padding: 0 10px; background: #fff; max-width: 100%; min-width: 0; text-overflow: ellipsis; }
.row > .grow { min-width: 0; }
input.txt { min-height: 44px; border-radius: 10px; border: 1px solid var(--line); padding: 0 12px; background: #fff; }

/* —— 做题 —— */
.progress { height: 6px; background: #e9e4dc; border-radius: 99px; overflow: hidden; }
.progress i { display: block; height: 100%; background: var(--blue); transition: width .2s; }
.qmeta { font-size: 14px; color: var(--ink-3); display: flex; justify-content: space-between; gap: 10px; margin: 12px 2px; }
.material { background: #faf8f4; border-left: 4px solid #d9cfbf; padding: 12px 16px; border-radius: 0 12px 12px 0; margin: 4px 0 14px; font-size: 18px; white-space: pre-line; }
.stem { font-size: 21px; line-height: 1.65; font-weight: 600; margin: 4px 0 18px; white-space: pre-line; }
.qimg { display: block; max-width: 100%; max-height: 420px; margin: 0 0 14px; border: 1px solid var(--line); border-radius: 10px; background: #fff; }
.opts { display: grid; gap: 12px; }
.opts.tf { grid-template-columns: 1fr 1fr; }
.opt { display: flex; gap: 14px; align-items: flex-start; text-align: left; width: 100%; background: var(--card); border: 2px solid var(--line); border-radius: 14px; padding: 13px 16px; min-height: 58px; font-size: 19px; }
.opt .k { flex: none; width: 32px; height: 32px; border-radius: 50%; background: #eef0f2; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 16px; }
.opts.tf .opt { justify-content: center; font-size: 22px; font-weight: 700; }
.opt.sel { border-color: var(--blue); background: var(--blue-soft); }
.opt.sel .k { background: var(--blue); color: #fff; }
.opt.right { border-color: var(--ok); background: var(--ok-soft); }
.opt.right .k { background: var(--ok); color: #fff; }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.opt.wrong .k { background: var(--bad); color: #fff; }
.opt:disabled { cursor: default; }
textarea.ans { width: 100%; min-height: 180px; border: 2px solid var(--line); border-radius: 14px; padding: 14px 16px; font-size: 19px; line-height: 1.6; background: #fff; resize: vertical; }
textarea.ans:focus { outline: none; border-color: var(--blue); }
.feedback { margin-top: 18px; border-radius: 14px; padding: 16px 18px; }
.feedback.ok { background: var(--ok-soft); }
.feedback.bad { background: var(--bad-soft); }
.feedback.part { background: var(--warn-soft); }
.feedback.wait { background: var(--blue-soft); }
.feedback .verdict { font-weight: 800; font-size: 20px; margin-bottom: 6px; }
.feedback.ok .verdict { color: var(--ok); }
.feedback.bad .verdict { color: var(--bad); }
.feedback.part .verdict { color: var(--warn); }
.feedback .why { margin-top: 6px; }
.feedback .src { margin-top: 8px; font-size: 14px; color: var(--ink-2); }
.pt { padding: 8px 0; border-top: 1px dashed rgba(0,0,0,.08); }
.pt:first-of-type { border-top: 0; }
.pt .mk { font-weight: 800; margin-right: 6px; }
.pt.hit .mk { color: var(--ok); }
.pt.miss .mk { color: var(--bad); }
.pt .note { font-size: 15px; color: var(--ink-2); margin-top: 2px; }
.next-bar { position: sticky; bottom: 0; padding: 14px 0 calc(var(--safe-b) + 6px); background: linear-gradient(transparent, var(--bg) 30%); }

/* —— 考试 —— */
.paper-q { padding: 16px 0; border-bottom: 1px solid var(--line); }
.paper-q:last-child { border-bottom: 0; }
.paper-q .stem { font-size: 19px; margin-bottom: 12px; }
.paper-q .opt { min-height: 50px; padding: 10px 14px; font-size: 18px; }
.sec-title { font-weight: 700; margin: 22px 0 4px; }

/* —— 结果 / 错题 / 档案 / 家长 —— */
.score { font-size: 56px; font-weight: 800; color: var(--blue); line-height: 1.1; }
.milestone { display: flex; align-items: center; gap: 14px; background: var(--orange-soft); border-radius: 14px; padding: 12px 16px; }
.milestone img { width: 56px; height: 56px; }
.milestone b { color: #c4532d; letter-spacing: 2px; }
.wq { border-left: 4px solid var(--bad); padding: 10px 14px; background: var(--card); border-radius: 0 12px 12px 0; margin-bottom: 10px; }
.wq.ok { border-left-color: var(--ok); }
.wq > div:first-child { white-space: pre-line; }
.wq .ans { color: var(--ok); font-weight: 600; }
.wq .mine { color: var(--bad); }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; text-align: center; }
.stats b { display: block; font-size: 24px; }
.stats span { font-size: 13px; color: var(--ink-3); }
.days { display: grid; grid-template-columns: repeat(14, 1fr); gap: 4px; align-items: end; height: 110px; }
.days .d { display: flex; flex-direction: column; justify-content: flex-end; align-items: center; height: 100%; }
.days .bar { width: 100%; background: var(--blue); border-radius: 4px 4px 0 0; min-height: 2px; }
.days .bar.zero { background: #e2ddd5; }
.days small { font-size: 10px; color: var(--ink-3); margin-top: 3px; }
.bars .b { display: flex; align-items: center; gap: 10px; margin: 6px 0; font-size: 14px; }
.bars .b i { display: block; height: 10px; border-radius: 6px; background: var(--blue); }
.banner { background: var(--warn-soft); color: var(--warn); border-radius: 12px; padding: 10px 14px; font-size: 15px; }
.list-item { display: flex; align-items: center; gap: 12px; width: 100%; text-align: left; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; margin-bottom: 8px; }

#toast { position: fixed; left: 50%; bottom: calc(var(--safe-b) + 28px); transform: translateX(-50%) translateY(20px); background: rgba(31,35,40,.92); color: #fff; padding: 12px 18px; border-radius: 12px; font-size: 16px; opacity: 0; pointer-events: none; transition: .2s; max-width: 90vw; z-index: 50; }
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 640px) {
  body { font-size: 17px; }
  main { padding-left: calc(var(--safe-l) + 16px); padding-right: calc(var(--safe-r) + 16px); }
  .top { padding-left: calc(var(--safe-l) + 16px); padding-right: calc(var(--safe-r) + 16px); }
  .subjects { grid-template-columns: 1fr; }
  .tiles { grid-template-columns: repeat(2, 1fr); }
  .stem { font-size: 19px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .lesson { flex-wrap: wrap; }
  .chips { margin-left: 68px; justify-content: flex-start; }
  .prow { flex-wrap: wrap; }
}

/* —— 新题型 —— */
.fillq { font-size: 20px; line-height: 2.2; font-weight: 600; margin: 4px 0 8px; white-space: pre-line; }
.blank { width: 7em; min-width: 4em; font: inherit; font-weight: 600; color: var(--blue); border: 0; border-bottom: 2px solid var(--blue); background: var(--blue-soft); border-radius: 6px 6px 0 0; padding: 0 6px; margin: 0 4px; text-align: center; }
.blank:focus { outline: none; background: #dfe8f8; }
.cls-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.cls-item { min-width: 5em; font-weight: 700; font-size: 18px; }
.cls .chips { margin-left: auto; }
.chip.pickcat { border: 1px solid var(--line); background: #fff; cursor: pointer; font-size: 15px; padding: 6px 12px; }
.chip.pickcat.on { background: var(--blue); color: #fff; border-color: var(--blue); }
.ord { display: grid; gap: 10px; margin: 8px 0; }
.ord-item { display: flex; gap: 12px; align-items: center; text-align: left; background: #fff; border: 2px solid var(--line); border-radius: 12px; padding: 12px 14px; font-size: 18px; min-height: 52px; }
.ord-item.on { border-color: var(--blue); background: var(--blue-soft); }
.ord-item .badge { flex: none; width: 30px; height: 30px; border-radius: 50%; background: #eef0f2; display: flex; align-items: center; justify-content: center; font-weight: 800; }
.ord-item.on .badge { background: var(--blue); color: #fff; }
.mt-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.mt-l { flex: 1; min-width: 6em; font-weight: 600; font-size: 18px; }
.mt-r { flex: 1; min-width: 9em; }
.part { padding: 12px 0; border-top: 1px dashed var(--line); }
.part-q { font-size: 18px; font-weight: 600; margin-bottom: 8px; white-space: pre-line; }
.part-fb { padding: 10px 0; border-top: 1px dashed rgba(0,0,0,.1); }
.mk.ok { color: var(--ok); font-weight: 800; margin-right: 4px; }
.mk.bad { color: var(--bad); font-weight: 800; margin-right: 4px; }