* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #f7f5f0; --card: #ffffff; --ink: #2b2b2b; --muted: #8a8578;
  --primary: #d94f30; --primary-soft: #fdeee9; --green: #2e9e5b; --green-soft: #e8f6ee;
  --red: #d93025; --red-soft: #fdecea; --amber: #b8860b; --line: #e8e3d8;
}
body { font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif; background: var(--bg); color: var(--ink); line-height: 1.7; }

.topbar { background: var(--card); border-bottom: 1px solid var(--line); padding: 10px 20px; display: flex; align-items: center; gap: 24px; flex-wrap: wrap; position: sticky; top: 0; z-index: 10; }
.brand { font-weight: 700; font-size: 18px; }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.tab { border: none; background: none; padding: 8px 14px; border-radius: 20px; cursor: pointer; font-size: 14px; color: var(--muted); }
.tab.active { background: var(--primary); color: #fff; font-weight: 600; }
.badge { background: var(--red); color: #fff; border-radius: 10px; padding: 0 6px; font-size: 11px; display: none; }
.badge.show { display: inline-block; }

main { max-width: 860px; margin: 0 auto; padding: 20px 16px 60px; }
.page { display: none; }
.page.active { display: block; }

.hero { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 28px; text-align: center; margin-bottom: 16px; }
.hero h2 { margin-bottom: 6px; }
.hero-stats { display: flex; justify-content: center; gap: 28px; margin: 18px 0; }
.hero-stats .stat b { font-size: 24px; color: var(--primary); display: block; }
.hero-stats .stat span { font-size: 12px; color: var(--muted); }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; margin-bottom: 16px; }
.card h3 { margin-bottom: 10px; font-size: 16px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 700px) { .grid2 { grid-template-columns: 1fr; } }

.btn { border: 1px solid var(--line); background: var(--card); border-radius: 10px; padding: 10px 20px; cursor: pointer; font-size: 15px; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }
.btn.big { font-size: 17px; padding: 14px 40px; }
.btn.small { font-size: 13px; padding: 6px 12px; }
.btn.danger { color: var(--red); border-color: var(--red); }
.btn:disabled { opacity: .45; cursor: default; }

.muted { color: var(--muted); }
.small { font-size: 13px; }

/* 科目切换 */
.subj-switch { display: flex; justify-content: center; gap: 10px; margin-bottom: 14px; }
.subj-btn { font-size: 16px; padding: 10px 28px; border-radius: 24px; }
.subj-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); font-weight: 700; }
.small-switch { justify-content: flex-start; margin-bottom: 12px; }
.small-switch .subj-btn { font-size: 13px; padding: 6px 18px; }

/* 练习界面 */
.qcard { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 24px; margin-bottom: 16px; }
.qmeta { font-size: 12px; color: var(--muted); margin-bottom: 12px; display: flex; gap: 8px; flex-wrap: wrap; }
.tag { background: var(--primary-soft); color: var(--primary); border-radius: 6px; padding: 1px 8px; font-size: 12px; }
.tag.gray { background: #f0ede6; color: var(--muted); }
.passage { background: #faf8f3; border-left: 3px solid var(--amber); padding: 14px 16px; border-radius: 8px; margin-bottom: 14px; font-size: 14.5px; white-space: pre-wrap; max-height: 320px; overflow-y: auto; }
.stem { font-size: 17px; font-weight: 600; margin-bottom: 16px; white-space: pre-wrap; }
.opt { display: block; width: 100%; text-align: left; border: 1.5px solid var(--line); background: #fff; border-radius: 10px; padding: 12px 16px; margin-bottom: 10px; cursor: pointer; font-size: 15.5px; }
.opt:hover:not(:disabled) { border-color: var(--primary); }
.opt.correct { border-color: var(--green); background: var(--green-soft); font-weight: 600; }
.opt.wrong { border-color: var(--red); background: var(--red-soft); }
.opt:disabled { cursor: default; }
.verdict { border-radius: 10px; padding: 14px 16px; margin: 14px 0; font-size: 14.5px; white-space: pre-wrap; }
.verdict.ok { background: var(--green-soft); border: 1px solid var(--green); }
.verdict.no { background: var(--red-soft); border: 1px solid var(--red); }
.verdict .ans { font-weight: 700; }
.qfooter { display: flex; gap: 10px; justify-content: flex-end; margin-top: 14px; }
.progress { height: 6px; background: #eee; border-radius: 3px; margin-bottom: 14px; overflow: hidden; }
.progress i { display: block; height: 100%; background: var(--primary); border-radius: 3px; transition: width .3s; }
.session-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; font-size: 14px; color: var(--muted); }

.subj-box { background: #faf8f3; border: 1px dashed var(--amber); border-radius: 10px; padding: 14px; margin: 12px 0; font-size: 14px; }

/* 错题本 */
.witem { border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; margin-bottom: 10px; background: #fff; }
.witem .top { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.pill { border-radius: 12px; padding: 2px 10px; font-size: 12px; font-weight: 600; }
.pill.due { background: var(--red-soft); color: var(--red); }
.pill.wait { background: #f0ede6; color: var(--muted); }
.pill.nail { background: #fff3d6; color: var(--amber); }
.pill.grad { background: var(--green-soft); color: var(--green); }

/* 知识库 */
.kbcat { display: inline-block; margin: 0 6px 10px 0; }
.kbitem { border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; margin-bottom: 10px; background: #fff; cursor: pointer; }
.kbitem:hover { border-color: var(--primary); }
.kbitem h4 { font-size: 15px; }
.kb-detail-body { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 24px; }
.kb-detail-body h2 { margin: 16px 0 10px; font-size: 17px; }
.kb-detail-body table { border-collapse: collapse; width: 100%; margin: 10px 0; font-size: 14px; }
.kb-detail-body th, .kb-detail-body td { border: 1px solid var(--line); padding: 6px 10px; text-align: left; }
.kb-detail-body th { background: #faf8f3; }
.kb-detail-body ul, .kb-detail-body ol { padding-left: 22px; margin: 8px 0; }
.kb-detail-body p { margin: 8px 0; }
.kb-detail-body strong { color: var(--primary); }

/* 看板 */
.stat-row { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px dashed var(--line); font-size: 14.5px; }
.kpbar { margin-bottom: 10px; font-size: 13.5px; }
.kpbar .bar { height: 8px; background: #f0ede6; border-radius: 4px; margin-top: 3px; overflow: hidden; }
.kpbar .bar i { display: block; height: 100%; background: var(--red); border-radius: 4px; }
select { padding: 8px 12px; border-radius: 8px; border: 1px solid var(--line); font-size: 14px; width: 100%; }
.footer { text-align: center; padding: 20px; }

.result-emoji { font-size: 40px; text-align: center; }

/* ---------- 云同步 ---------- */
.sync-dot { width: 9px; height: 9px; border-radius: 50%; display: inline-block; flex: 0 0 auto; margin-left: auto; background: #dcd8cc; }
.sync-dot.s-idle { background: #c9c4b8; }
.sync-dot.s-syncing { background: var(--amber); animation: syncPulse 1s ease-in-out infinite; }
.sync-dot.s-ok { background: var(--green); }
.sync-dot.s-offline { background: var(--red); }
.sync-dot.s-disabled { background: #dedad0; }
@keyframes syncPulse { 0%, 100% { opacity: .3; } 50% { opacity: 1; } }

.sync-pill { border-radius: 10px; padding: 1px 8px; font-size: 12px; font-weight: 500; }
.sync-pill.ok, .sync-pill.idle { background: var(--green-soft); color: var(--green); }
.sync-pill.syncing { background: #fdf3dc; color: var(--amber); }
.sync-pill.offline { background: var(--red-soft); color: var(--red); }
.sync-pill.disabled { background: #f0ede6; color: var(--muted); }
#syncInfo code { background: #f3f0e9; border: 1px solid var(--line); border-radius: 5px; padding: 1px 6px; font-size: 13px; }

/* ================= v2 ================= */
/* 首页：倒计时 + 佳句 */
.v2-hero-row { display: grid; grid-template-columns: 220px 1fr; gap: 12px; margin-bottom: 16px; }
@media (max-width: 700px) { .v2-hero-row { grid-template-columns: 1fr; } }
.v2-card { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 20px; }
.v2-countdown { text-align: center; display: flex; flex-direction: column; justify-content: center; }
.v2-countdown b { font-size: 44px; color: var(--primary); line-height: 1.1; }
.v2-label { font-size: 13px; color: var(--muted); }
.v2-sub { font-size: 12px; color: var(--muted); }
.v2-quote { display: flex; flex-direction: column; justify-content: center; }
.v2-quote-t { font-size: 16px; font-weight: 600; }
.v2-quote-a { font-size: 13px; color: var(--muted); margin-top: 4px; }
.v2-quote-u { font-size: 12px; color: var(--muted); margin-top: 6px; }
/* 学科卡片网格 */
.v2-subj-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 16px; }
@media (max-width: 700px) { .v2-subj-grid { grid-template-columns: repeat(2, 1fr); } }
.v2-subj-card { background: var(--card); border: 1.5px solid var(--line); border-radius: 12px; padding: 12px 10px; text-align: center; cursor: pointer; display: flex; flex-direction: column; gap: 4px; }
.v2-subj-card:hover { border-color: var(--primary); }
.v2-subj-card.active { border-color: var(--primary); background: var(--primary-soft); }
.v2-subj-name { font-size: 15px; font-weight: 600; }
.v2-subj-due { font-size: 12px; color: var(--red); }
.v2-subj-due:empty::after { content: ""; }
.v2-subj-rate { font-size: 12px; color: var(--muted); }
/* 今日清单 */
.v2-today h3 { margin-bottom: 8px; }
.v2-todo-row { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px dashed var(--line); font-size: 14.5px; }
.v2-todo-status { font-weight: 600; }
/* 悬浮拍照按钮 */
#v2Fab { position: fixed; right: 22px; bottom: 26px; width: 56px; height: 56px; border-radius: 50%; background: var(--primary); color: #fff; font-size: 32px; line-height: 1; border: none; box-shadow: 0 4px 14px rgba(217,79,48,.4); cursor: pointer; z-index: 60; }
#v2Fab:active { transform: scale(.94); }
/* 弹层 */
.v2-overlay { position: fixed; inset: 0; background: rgba(30,28,22,.45); z-index: 100; display: flex; align-items: flex-start; justify-content: center; overflow-y: auto; padding: 30px 12px; }
.v2-modal { background: #fff; border-radius: 16px; padding: 20px; width: 100%; max-width: 560px; margin-bottom: 40px; }
.v2-wiz-head { font-size: 17px; font-weight: 700; margin-bottom: 12px; display: flex; justify-content: space-between; align-items: center; }
.v2-close { border: none; background: #f0ede6; border-radius: 50%; width: 30px; height: 30px; font-size: 15px; cursor: pointer; }
.v2-wiz-step { margin: 12px 0 6px; }
.v2-wiz-subjs { display: flex; gap: 8px; flex-wrap: wrap; }
.v2-photo-area { border: 2px dashed var(--line); border-radius: 12px; min-height: 120px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; padding: 12px; }
.v2-photo-label { cursor: pointer; color: var(--primary); font-weight: 600; padding: 8px 16px; border: 1px solid var(--primary); border-radius: 10px; font-size: 14px; }
#wizCanvas { max-width: 100%; border-radius: 8px; cursor: crosshair; }
.v2-cause-row { display: flex; gap: 8px; flex-wrap: wrap; margin: 6px 0 10px; }
.v2-input { width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; font-size: 14.5px; margin-bottom: 10px; }
.v2-wiz-save { width: 100%; margin-top: 6px; }
/* 复习弹层 */
.v2-review-photo { margin: 8px 0; text-align: center; }
.v2-review-photo img { max-width: 100%; max-height: 46vh; border-radius: 10px; border: 1px solid var(--line); }
/* 家长口令 */
#v2ParentGate { background: rgba(30,28,22,.88); }
.v2-subj-due.none { color: var(--muted); }
.v2-gate-box { text-align: center; padding: 30px 10px; }