/* 设计系统 v2：变量（含旧别名 --primary / --text / --muted …）统一由 /tokens.css 提供 */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Noto Sans SC", sans-serif; color: var(--text); background: var(--bg); font-size: 15px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
a { color: var(--primary); text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
svg.ic { width: 20px; height: 20px; flex: none; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* 演示模式横幅 */
.demo-banner { position: sticky; top: 0; z-index: 50; background: linear-gradient(90deg, #fff7ed, #fffbeb); color: #9a3412; border-bottom: 1px solid #fed7aa; padding: 7px 16px; font-size: 13px; text-align: center; }
.demo-banner b { font-weight: 600; }

/* 布局 */
.layout { display: flex; min-height: 100vh; }
.sidebar { width: var(--sidebar); background: #fff; border-right: 1px solid var(--border); padding: 20px 14px; position: sticky; top: 0; height: 100vh; display: flex; flex-direction: column; flex: none; }
.has-banner .sidebar { top: 35px; height: calc(100vh - 35px); }
.brand { display: flex; align-items: center; gap: 10px; padding: 4px 8px 20px; font-weight: 700; font-size: 17px; }
.brand .logo { width: 34px; height: 34px; border-radius: 10px; background: linear-gradient(135deg, #2B8CFF, #0063D1); color: #fff; display: grid; place-items: center; font-size: 18px; }
.brand small { display: block; font-weight: 400; font-size: 12px; color: var(--muted); }
.nav a { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 10px; color: #374151; margin-bottom: 2px; font-weight: 500; }
.nav a:hover { background: #f3f4f6; }
.nav a.active { background: var(--primary-50); color: var(--primary); }
.sidebar .me { margin-top: auto; border-top: 1px solid var(--border); padding: 14px 8px 0; font-size: 13px; color: var(--muted); }
.sidebar .me b { color: var(--text); display: block; font-size: 14px; }
.account-profile, .billing-profile { display: flex; align-items: center; gap: 12px; }
.account-profile { min-width: 0; }
.account-profile > :last-child { min-width: 0; flex: 1 1 auto; }
.account-email { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar .teacher-avatar { margin-right: 6px; }
.main { flex: 1; min-width: 0; padding: 28px 32px 40px; }
.topbar { display: none; }
.bottom-nav { display: none; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 12px; margin-bottom: 20px; flex-wrap: wrap; }
.page-head h1 { margin: 0; font-size: 22px; }
.page-head p { margin: 4px 0 0; color: var(--muted); font-size: 14px; }

/* 卡片 & 网格 */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; }
.card + .card { margin-top: 16px; }
.card h2 { font-size: 16px; margin: 0 0 14px; display: flex; align-items: center; gap: 8px; }
.split { display: grid; grid-template-columns: 360px minmax(0, 1fr); gap: 20px; align-items: start; }
.split.narrow { grid-template-columns: 300px minmax(0, 1fr); }
.split > .card:first-child { position: sticky; top: 20px; }
.has-banner .split > .card:first-child { top: 55px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* 表单 */
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: #374151; font-weight: 500; margin-bottom: 6px; }
.field label .req { color: var(--red); margin-left: 2px; }
.field .hint { font-size: 12px; color: var(--muted); margin-top: 4px; }
.input, select.input, textarea.input { width: 100%; border: 1px solid #d1d5db; border-radius: 10px; padding: 9px 12px; background: #fff; outline: none; transition: border .15s, box-shadow .15s; }
.input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-100); }
textarea.input { resize: vertical; min-height: 80px; line-height: 1.7; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { border: 1px solid #d1d5db; background: #fff; border-radius: 999px; padding: 5px 12px; font-size: 13px; cursor: pointer; user-select: none; transition: all .15s; }
.chip:hover { border-color: var(--primary); }
.chip.on { background: var(--primary); border-color: var(--primary); color: #fff; }
.chip.warn.on { background: var(--amber); border-color: var(--amber); }
.chip.sm { padding: 2px 9px; font-size: 12px; }
.seg { display: inline-flex; background: #f3f4f6; border-radius: 10px; padding: 3px; gap: 2px; flex-wrap: wrap; }
.seg button { border: 0; background: transparent; padding: 6px 14px; border-radius: 8px; cursor: pointer; font-size: 13px; color: #4b5563; }
.seg button.on { background: #fff; color: var(--primary); box-shadow: var(--shadow); font-weight: 600; }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; border: 1px solid #d1d5db; background: #fff; border-radius: 10px; padding: 8px 14px; cursor: pointer; font-weight: 500; font-size: 14px; white-space: nowrap; transition: all .15s; }
.btn:hover { background: #f9fafb; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-600); }
.btn.danger { color: var(--red); }
.btn.danger:hover { background: var(--red-50); border-color: #fecaca; }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.ghost:hover { background: #f3f4f6; }
.btn.sm { padding: 5px 10px; font-size: 13px; border-radius: 8px; }
.btn.block { width: 100%; padding: 11px; }
.btn .ic { width: 16px; height: 16px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.spacer { flex: 1; }

/* 工作台 */
.hello { background: transparent; color: var(--color-text-1); border: 0; box-shadow: none; padding: 8px 4px; }
.hello h1 { margin: 0 0 4px; font-size: var(--font-size-4xl); line-height: var(--line-height-tight); letter-spacing: var(--letter-spacing-title); }
.hello p { margin: 0; color: var(--color-text-4); }
.grid-4 .card + .card { margin-top: 0; }
.quick { display: flex; flex-direction: column; gap: 10px; cursor: pointer; transition: transform .15s, box-shadow .15s; min-height: 124px; }
.quick:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,113,227,.12); }
.quick .qi { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; flex: none; }
.quick .qi .ic { width: 22px; height: 22px; }
.quick b { font-size: 16px; }
.quick span { color: var(--muted); font-size: 13px; line-height: 1.3; height: 2.6em; overflow: hidden; display: block; }
.stats { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.stat { text-align: center; padding: 14px 8px; }
.stat b { display: block; font-size: 24px; color: var(--primary); }
.stat span { font-size: 13px; color: var(--muted); }
.c-indigo { background: var(--color-primary-50); color: var(--color-primary); } .c-green { background: #ecfdf5; color: #059669; } .c-amber { background: #fffbeb; color: #d97706; } .c-pink { background: #fdf2f8; color: #db2777; } .c-sky { background: #f0f9ff; color: #0284c7; }

/* 列表 */
.list { display: flex; flex-direction: column; }
.item { display: flex; align-items: center; gap: 12px; padding: 12px 4px; border-bottom: 1px solid #f1f2f4; }
.item:last-child { border-bottom: 0; }
.item .grow { flex: 1; min-width: 0; }
.item .t { font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item .s { font-size: 12px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item.click { cursor: pointer; border-radius: 10px; padding-left: 8px; padding-right: 8px; }
.item.click:hover { background: #f9fafb; }
.tag { display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 6px; font-weight: 500; }
.tag.lesson { background: var(--tag-lesson-bg); color: var(--tag-lesson-fg); } .tag.quiz { background: #ecfdf5; color: #059669; } .tag.feedback { background: #fdf2f8; color: #db2777; }
.empty { text-align: center; color: var(--muted); padding: 36px 12px; font-size: 14px; }
.empty .big { font-size: 40px; margin-bottom: 6px; }

/* 输出区 */
.output-empty { text-align: center; color: var(--muted); padding: 60px 20px; }
.output-empty .big { font-size: 48px; }
.md { line-height: 1.85; word-break: break-word; }
.md h1 { font-size: 22px; text-align: center; margin: 4px 0 16px; }
.md h2 { font-size: 17px; margin: 22px 0 10px; padding-left: 10px; border-left: 4px solid var(--primary); }
.md h3 { font-size: 15px; margin: 16px 0 8px; }
.md p { margin: 6px 0; }
.md ul, .md ol { margin: 6px 0; padding-left: 22px; }
.md blockquote { margin: 8px 0; padding: 8px 12px; background: var(--amber-50); border-left: 4px solid #fbbf24; color: #92400e; border-radius: 6px; }
.md table { border-collapse: collapse; width: 100%; margin: 10px 0; font-size: 14px; display: block; overflow-x: auto; }
.md th, .md td { border: 1px solid var(--border); padding: 7px 10px; text-align: left; vertical-align: top; }
.md th { background: var(--primary-50); white-space: nowrap; }
.editor { width: 100%; min-height: 520px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13.5px; }
.cursor::after { content: '▍'; color: var(--primary); animation: blink 1s infinite; }
@keyframes blink { 50% { opacity: 0; } }
.loading { display: flex; align-items: center; gap: 10px; color: var(--muted); padding: 20px 0; }
.spinner { width: 18px; height: 18px; border: 2px solid var(--primary-100); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.error-box { background: var(--red-50); border: 1px solid #fecaca; color: #991b1b; border-radius: 12px; padding: 14px 16px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.error-box .grow { flex: 1; min-width: 200px; }

/* 题目 */
.q { border: 1px solid var(--border); border-radius: 12px; padding: 14px 16px; margin-bottom: 12px; background: #fff; }
.q-head { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; flex-wrap: wrap; }
.q-no { font-weight: 700; color: var(--primary); }
.q-stem { white-space: pre-wrap; }
.q-opts { margin: 6px 0 0; padding: 0; list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 4px 16px; }
.q-ans { margin-top: 10px; background: #f9fafb; border-radius: 8px; padding: 10px 12px; font-size: 14px; }
.q-ans b.a { color: var(--green); } .q-ans b.x { color: #2563eb; }
.q-actions { margin-left: auto; display: flex; gap: 4px; }
.q.busy { opacity: .5; pointer-events: none; }

/* 反馈 */
.fb-card { border: 1px solid var(--border); border-radius: 12px; padding: 14px; margin-bottom: 12px; }
.fb-card .fb-text { white-space: pre-wrap; line-height: 1.8; }
.fb-row { border: 1px solid var(--border); border-radius: 12px; padding: 10px 12px; margin-bottom: 8px; }
.fb-row .name { font-weight: 600; margin-bottom: 6px; display: flex; align-items: center; gap: 8px; }
.status { font-size: 12px; padding: 1px 8px; border-radius: 6px; background: #f3f4f6; color: var(--muted); }
.status.ok { background: var(--green-50); color: var(--green); } .status.err { background: var(--red-50); color: var(--red); } .status.ing { background: var(--primary-50); color: var(--primary); }

/* 学员 */
.cls { display: flex; align-items: center; gap: 8px; padding: 10px 12px; border-radius: 10px; cursor: pointer; margin-bottom: 4px; border: 1px solid transparent; }
.cls:hover { background: #f9fafb; }
.cls.on { background: var(--primary-50); border-color: var(--primary-100); }
.cls .grow { flex: 1; min-width: 0; }
.cls .s { font-size: 12px; color: var(--muted); }
.avatar { width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; font-weight: 600; color: #fff; flex: none; font-size: 14px; }
.teacher-avatar { position: relative; flex: none; width: 34px; height: 34px; overflow: visible; }
.teacher-avatar-lg, .teacher-avatar-lg > .avatar { width: 56px; height: 56px; }
.teacher-avatar-lg > .avatar { font-size: 20px; }
.avatar-img { object-fit: cover; }
.pro-tag { display: inline-block; margin-left: 4px; font-size: 11px; font-weight: 700; line-height: 1.8; padding: 0 7px; border-radius: 999px; background: var(--badge-pro-bg); background-image: var(--badge-pro-gradient); color: var(--badge-pro-fg); white-space: nowrap; }
.member-badge { --badge-h: var(--badge-sm-h); --badge-px: var(--badge-sm-px); --badge-font: var(--badge-sm-font); --badge-border: var(--badge-sm-border);
  position: absolute; right: var(--badge-sm-right); bottom: var(--badge-sm-bottom); display: inline-flex; align-items: center; justify-content: center;
  box-sizing: border-box; height: var(--badge-h); padding: 0 var(--badge-px); border: var(--badge-border) solid var(--badge-ring); border-radius: 999px;
  font-family: var(--font-family); font-size: var(--badge-font); font-weight: 700; letter-spacing: 0.02em; line-height: var(--badge-h); white-space: nowrap; }
.member-badge-go { background: var(--badge-go-bg); color: var(--badge-go-fg); }
.member-badge-pro { background: var(--badge-pro-bg); background-image: var(--badge-pro-gradient); color: var(--badge-pro-fg); }
.teacher-avatar-lg > .member-badge { --badge-h: var(--badge-lg-h); --badge-px: var(--badge-lg-px); --badge-font: var(--badge-lg-font); --badge-border: var(--badge-lg-border); right: var(--badge-lg-right); bottom: var(--badge-lg-bottom); }

/* 登录 */
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 20px; background: var(--color-bg); }
.login-card { width: 100%; max-width: 420px; padding: 32px 28px; }
.login-card .brand { justify-content: center; padding-bottom: 6px; font-size: 20px; }
.login-card .sub { text-align: center; color: var(--muted); margin: 0 0 24px; font-size: 14px; }

/* Toast & Modal */
#toast-root { position: fixed; left: 50%; top: 20px; transform: translateX(-50%); z-index: 1000; display: flex; flex-direction: column; gap: 8px; align-items: center; pointer-events: none; }
.toast { background: #111827; color: #fff; padding: 9px 16px; border-radius: 10px; font-size: 14px; box-shadow: 0 8px 24px rgba(0,0,0,.18); animation: pop .2s ease; max-width: 90vw; }
.toast.err { background: var(--red); } .toast.ok { background: #059669; }
@keyframes pop { from { opacity: 0; transform: translateY(-6px); } }
.modal-mask { position: fixed; inset: 0; background: rgba(17,24,39,.45); z-index: 900; display: grid; place-items: center; padding: 16px; animation: fade .15s; }
@keyframes fade { from { opacity: 0; } }
.modal { background: #fff; border-radius: 16px; width: 100%; max-width: 560px; max-height: 88vh; display: flex; flex-direction: column; box-shadow: 0 20px 50px rgba(0,0,0,.2); }
.modal.wide { max-width: 760px; }
.modal-h { padding: 16px 20px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; font-weight: 600; font-size: 16px; }
.modal-b { padding: 18px 20px; overflow-y: auto; overflow-x: hidden; }
.modal-f { padding: 12px 20px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 8px; }

/* 响应式 */
@media (max-width: 1100px) {
  .split, .split.narrow { grid-template-columns: minmax(0, 1fr); }
  .split > .card:first-child { position: static; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  body { font-size: 14.5px; }
  .sidebar { display: none; }
  .topbar { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px; padding: 10px 16px; background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 40; }
  .has-banner .topbar { top: 35px; }
  .topbar .brand { padding: 0; font-size: 16px; }
  .topbar .brand .logo { width: 30px; height: 30px; font-size: 16px; }
  .layout { flex-direction: column; }
  .main { padding: 16px 14px calc(84px + env(safe-area-inset-bottom)); }
  .bottom-nav { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; position: fixed; bottom: 0; left: 0; right: 0; background: rgba(255,255,255,.97); backdrop-filter: blur(8px); border-top: 1px solid var(--border); z-index: 60; padding-bottom: env(safe-area-inset-bottom); }
  .bottom-nav a { display: flex; flex-direction: column; align-items: center; gap: 2px; padding: 7px 0 6px; font-size: 11px; color: var(--muted); }
  .bottom-nav a.active { color: var(--primary); }
  .bottom-nav .ic { width: 21px; height: 21px; }
  .page-head h1 { font-size: 19px; }
  .card { padding: 16px; border-radius: 12px; }
  .grid-4 { gap: 10px; }
  .quick { padding: 14px; min-height: 0; }
  .quick span { display: none; }
  .stats { grid-template-columns: repeat(3, 1fr); }
  .stats .stat:nth-child(n+4) { display: none; }
  .grid-2 { grid-template-columns: 1fr 1fr; gap: 10px; }
  .q-opts { grid-template-columns: 1fr; }
  .editor { min-height: 380px; }
  .demo-banner { font-size: 12px; padding: 6px 10px; }
  .modal { max-height: 92vh; }
  .hide-sm { display: none !important; }
}
@media (min-width: 769px) { .show-sm { display: none !important; } }

/* 公式 */
.katex { font-size: 1.05em; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; margin: 8px 0; }
.q-opts .katex, .q-stem .katex { font-size: 1.08em; }

/* 拍照识别 */
.tag.scan { background: #fff7ed; color: #c2410c; }
.dropzone { display: flex; flex-direction: column; align-items: center; gap: 6px; border: 2px dashed var(--color-primary-200); border-radius: 12px; padding: 22px 12px; text-align: center; cursor: pointer; background: var(--color-primary-50); color: var(--muted); font-size: 12px; transition: all .15s; }
.dropzone b { color: var(--color-primary-text); font-size: 14px; display: flex; align-items: center; gap: 6px; }
.dropzone:hover, .dropzone.over { border-color: var(--primary); background: var(--primary-50); }
.files { display: flex; flex-direction: column; gap: 6px; margin-top: 10px; }
.file { display: flex; align-items: center; gap: 8px; font-size: 13px; background: #f9fafb; border-radius: 8px; padding: 4px 4px 4px 10px; }
.file .fn { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file .status { max-width: 45%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.modes { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 14px; }
.mode { border: 1px solid var(--border); border-radius: 10px; padding: 8px 10px; cursor: pointer; transition: all .15s; }
.mode b { display: block; font-size: 14px; } .mode span { font-size: 12px; color: var(--muted); }
.mode.on { border-color: var(--primary); background: var(--primary-50); box-shadow: 0 0 0 1px var(--primary) inset; }
.check { display: flex; align-items: center; gap: 6px; font-size: 13px; margin: -4px 0 14px; }
.recog-meta { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.graded-list { display: flex; flex-direction: column; gap: 14px; margin-bottom: 16px; }
.graded { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 14px; border: 1px solid var(--border); border-radius: 12px; padding: 10px; }
.graded img { width: 100%; border-radius: 8px; display: block; border: 1px solid #eee; }
.gitems { font-size: 13px; display: flex; flex-direction: column; gap: 6px; }
.gitem { display: grid; grid-template-columns: 62px 84px minmax(0, 1fr); gap: 6px; align-items: center; }
.gitem .input { padding: 4px 8px; font-size: 13px; }
@media (max-width: 768px) { .graded { grid-template-columns: 1fr; } .modes { grid-template-columns: 1fr 1fr; } }
/* 登录 / 邮箱注册 */
.login-card .lt { margin: 0 0 14px; font-size: 17px; text-align: center; }
.code-row { display: flex; gap: 8px; }
.code-row .input { flex: 1; min-width: 0; }
.code-row .btn { flex: none; min-width: 112px; }
.hint-line { font-size: 12px; color: var(--muted); margin-top: 6px; }
.hint-line .dc { color: var(--color-primary-text, #0062C4); font-size: 15px; letter-spacing: 2px; }
.lrow { display: flex; justify-content: space-between; }
.lrow a { font-weight: 400; font-size: 13px; }
.agree { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); margin: 4px 0 14px; flex-wrap: wrap; }
.legal-links { text-align: center; font-size: 12px; color: var(--muted); margin: 10px 0 0; }
.md.legal { font-size: 14px; max-height: 60vh; overflow: auto; }
.md.legal h1 { font-size: 18px; }

/* ============ 课表 / 上课时间（设计系统 v2.1 令牌） ============ */
.cls.pseudo { border-top: 1px dashed var(--color-border-strong); border-radius: 0 0 10px 10px; margin-top: 6px; padding-top: 12px; }
.cls.pseudo.on { border-radius: 10px; }
.item.hl { background: var(--color-primary-50); border-radius: 10px; padding-left: 8px; padding-right: 8px; box-shadow: 0 0 0 1px var(--color-primary-200) inset; }
.slot-sum { color: var(--color-text-3) !important; }
.slot-sum .ic { width: 13px; height: 13px; vertical-align: -2px; margin-right: 4px; color: var(--color-primary); }
.split > * { min-width: 0; }
.slot-list { display: flex; flex-direction: column; gap: 8px; margin-bottom: 8px; }
.slot-row { display: grid; grid-template-columns: 84px minmax(250px, 1.4fr) 100px minmax(0, 1fr) 36px; gap: 8px; align-items: center; padding: 10px; background: var(--color-fill-1); border-radius: var(--radius-md); }
.slot-row.bad { box-shadow: 0 0 0 1px var(--color-danger) inset; }
.slot-row .input { background: var(--color-surface); }
.sl-time { display: flex; align-items: center; gap: 6px; }
.sl-time .input { min-width: 0; font-variant-numeric: tabular-nums; }
.sl-time span { color: var(--color-text-4); }
.sl-err, .field-err { grid-column: 1 / -1; font-size: var(--font-size-xs); color: var(--color-danger-text); }
.sl-err:empty, .field-err:empty { display: none; }
.field-err { margin-top: 6px; }
.tt-warn { background: var(--color-warning-bg); color: var(--color-warning-text); border-radius: var(--radius-md); padding: 10px 14px; font-size: var(--font-size-sm); margin-bottom: 12px; line-height: 1.6; }
.tt-conf-list { margin: 0; padding-left: 20px; color: var(--color-warning-text); line-height: 1.8; }
.spick { display: flex; flex-direction: column; gap: 10px; max-height: 220px; overflow-y: auto; padding: 2px; }
.spick-h { font-size: var(--font-size-xs); color: var(--color-text-4); margin-bottom: 4px; font-weight: 500; }
.ti-list { display: flex; flex-direction: column; gap: 10px; max-height: 50vh; overflow-y: auto; padding-right: 2px; }
.ti-row { border: 1px solid #eceef1; border-radius: 12px; padding: 10px 12px; }
.ti-row.conflict { background: var(--color-warning-bg); border-color: var(--color-warning-text); }
.ti-row-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px; flex-wrap: wrap; }
.ti-fields { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; }
@media (max-width: 640px) { .ti-fields { grid-template-columns: repeat(2, 1fr); } }
.tt-card { padding: 16px; }
.tt-bar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.tt-range b { font-size: var(--font-size-xl); font-weight: 600; font-variant-numeric: tabular-nums; }
.tt-sum { font-size: var(--font-size-sm); color: var(--color-text-4); }
.seg.tt-nav button.on { color: var(--color-text-1); }
.tt-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.tt { --tt-hour: 52px; --tt-gutter: 52px; min-width: 640px; }
.tt-head { display: grid; grid-template-columns: var(--tt-gutter) repeat(7, minmax(0, 1fr)); position: sticky; top: 0; z-index: 2; background: var(--color-surface); border-bottom: 1px solid var(--color-border); }
.tt-day { text-align: center; padding: 6px 0 8px; display: flex; flex-direction: column; align-items: center; gap: 2px; }
.tt-day span { font-size: var(--font-size-xs); color: var(--color-text-4); }
.tt-day b { font-size: var(--font-size-xl); font-weight: 600; width: 32px; height: 32px; line-height: 32px; border-radius: 50%; font-variant-numeric: tabular-nums; }
.tt-day.today span { color: var(--color-primary); font-weight: 600; }
.tt-day.today b { background: var(--color-primary); color: #fff; }
.tt-body { display: grid; grid-template-columns: var(--tt-gutter) repeat(7, minmax(0, 1fr)); height: calc(var(--tt-hours) * var(--tt-hour)); position: relative; }
.tt-times { position: relative; }
.tt-times span { position: absolute; right: 8px; transform: translateY(-50%); font-size: var(--font-size-xs); color: var(--color-text-4); font-variant-numeric: tabular-nums; }
.tt-times span:first-child { transform: none; }
.tt-col { position: relative; border-left: 1px solid var(--color-border); cursor: copy;
  background-image: repeating-linear-gradient(to bottom, var(--color-border) 0 1px, transparent 1px var(--tt-hour)); }
.tt-col.today { background-color: rgba(0, 113, 227, 0.035); }
.tt-col:hover { background-color: var(--color-fill-1); }
.tt-now { position: absolute; left: 0; right: 0; height: 2px; background: var(--color-danger); z-index: 3; pointer-events: none; }
.tt-now::before { content: ''; position: absolute; left: -4px; top: -3px; width: 8px; height: 8px; border-radius: 50%; background: var(--color-danger); }
.tt-block { position: absolute; z-index: 1; display: flex; flex-direction: column; gap: 1px; overflow: hidden; text-align: left; padding: 4px 6px 4px 8px; border: 0; border-radius: var(--radius-sm); cursor: pointer; font: inherit;
  background: var(--b-bg); color: var(--b-fg); box-shadow: inset 3px 0 0 var(--b-bar); transition: transform var(--duration-fast) var(--ease-out), box-shadow var(--duration-fast) var(--ease-out); }
.tt-block:hover { box-shadow: inset 3px 0 0 var(--b-bar), var(--shadow-md); z-index: 2; }
.tt-block:active { transform: scale(var(--press-scale)); }
.tt-block:focus-visible { outline: 0; box-shadow: inset 3px 0 0 var(--b-bar), var(--shadow-focus); }
.tt-names { font-size: var(--font-size-sm); font-weight: 600; line-height: 1.35; overflow: hidden; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; word-break: break-all; }
.tt-meta i, .tt-meta em { font-style: normal; }
.tt-meta { font-size: var(--font-size-xs); line-height: 1.35; opacity: .9; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-variant-numeric: tabular-nums; }
.tt-block.short .tt-names { -webkit-line-clamp: 1; }
.tt-block.conflict { box-shadow: inset 3px 0 0 var(--b-bar), 0 0 0 1.5px var(--color-danger); }
.s-chinese { --b-bg: var(--subject-chinese-bg); --b-fg: var(--subject-chinese-fg); --b-bar: var(--subject-chinese-fg); }
.s-math { --b-bg: var(--subject-math-bg); --b-fg: var(--subject-math-fg); --b-bar: var(--subject-math-fg); }
.s-english { --b-bg: var(--subject-english-bg); --b-fg: var(--subject-english-fg); --b-bar: var(--subject-english-fg); }
.s-none { --b-bg: var(--color-fill-1); --b-fg: var(--color-text-1); --b-bar: var(--av, var(--color-primary)); }
@supports (background: color-mix(in srgb, red 10%, white)) { .s-none { --b-bg: color-mix(in srgb, var(--av, #0071E3) 10%, white); } }
.tt-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--b-bar); flex: none; }
.today-item.past { opacity: .55; }
.today-item.now .t { color: var(--color-primary); }
.tt-detail .kv { display: flex; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--color-border); font-size: var(--font-size-md); }
.tt-detail .kv span { width: 84px; flex: none; color: var(--color-text-4); }
.tt-detail .kv b { font-weight: 500; }
@media (max-width: 768px) {
  .slot-row { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) 36px; }
  .slot-row .sl-day { grid-area: 1 / 1; } .slot-row .sl-subj { grid-area: 1 / 2; } .slot-row .sl-del { grid-area: 1 / 3; }
  .slot-row .sl-time { grid-area: 2 / 1 / 3 / 4; } .slot-row .sl-note { grid-area: 3 / 1 / 4 / 4; } .slot-row .sl-err { grid-area: 4 / 1 / 5 / 4; }
  .sl-time .input { flex: 1; width: 0; }
  .tt-card { padding: 10px 6px; }
  .tt-bar { padding: 0 6px; gap: 8px; }
  .tt-range b { font-size: var(--font-size-md); }
  .tt-sum { display: none; }
  .tt { --tt-hour: 60px; --tt-gutter: 40px; min-width: 0; }
  .tt-times span { right: 4px; font-size: 12px; letter-spacing: -.3px; }
  .tt-day b { font-size: var(--font-size-md); width: 26px; height: 26px; line-height: 26px; }
  .tt-block { padding: 3px 3px 3px 5px; border-radius: 6px; }
  .tt-names { font-size: 12px; line-height: 1.3; -webkit-line-clamp: 5; }
  .tt-meta { font-size: 12px; }
  .tt-meta em, .tt-meta + .tt-meta { display: none; }
  .tt-block.short .tt-names { -webkit-line-clamp: 2; }
  .tt-block.short .tt-meta { display: none; }
  .bottom-nav a { font-size: 10px; }
}
@media (prefers-reduced-motion: reduce) { .tt-block { transition: none; } }

/* 套餐与额度 */
.billing-nav { display: flex; justify-content: space-between; gap: 8px; margin: 14px 0 6px; padding: 8px 0; font-weight: 600; }
.billing-nav.active { color: var(--color-primary-text); }
.billing-muted { color: var(--color-text-4); font-size: 13px; }
.billing-notice { white-space: pre-wrap; overflow-wrap: anywhere; }
.billing-hint { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-top: 16px; padding: 14px 20px; font-size: 14px; }
.billing-hint > span:first-child { color: var(--color-text-3); }
.billing-page { max-width: 1240px; margin: 0 auto; }
.billing-current-head, .billing-plan-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.billing-current-head h2 { font-size: 24px; margin: 4px 0; gap: 0; }
.billing-current-head [data-current-plan] { color: #1D1D1F; font-weight: 600; margin: 0; padding: 0; }
.billing-badge { display: inline-block; color: var(--color-primary-text); background: var(--color-primary-50); padding: 3px 12px; font-size: 12px; font-weight: 600; border-radius: var(--radius-full); white-space: nowrap; }
.billing-org { font-size: 14px; color: var(--color-text-3); overflow-wrap: anywhere; }
.billing-quotas { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; margin-top: 20px; }
.billing-quotas h3 { margin: 0 0 6px; font-size: 15px; }
.billing-quotas p { margin: 0; font-size: 14px; }
.billing-progress { display: block; appearance: none; width: 100%; height: 8px; margin: 12px 0 8px; overflow: hidden; border: 0; border-radius: var(--radius-full); background: var(--color-fill-2); accent-color: var(--color-primary); }
.billing-progress::-webkit-progress-bar { background: var(--color-fill-2); }
.billing-progress::-webkit-progress-value { background: var(--color-primary); border-radius: var(--radius-full); }
.billing-progress::-moz-progress-bar { background: var(--color-primary); border-radius: var(--radius-full); }
.billing-section-title { font-size: 18px; margin: 26px 0 14px; }
.billing-plans { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.billing-plans > .billing-plan { display: flex; flex-direction: column; margin: 0; min-width: 0; }
.billing-plan.recommended { border-color: var(--color-primary); }
.billing-plan-head { margin-bottom: 16px; gap: 6px; }
.billing-plan-head h2 { margin: 0; }
.billing-price { display: flex; align-items: baseline; flex-wrap: wrap; gap: 4px; }
.billing-price strong { font-size: 32px; line-height: 1.2; font-weight: 700; letter-spacing: -.03em; }
.billing-price span { font-size: 13px; color: var(--color-text-4); }
.billing-price-note { min-height: 44px; margin-top: 10px; font-size: 13px; color: var(--color-text-4); }
.billing-features { list-style: none; padding: 0; margin: 16px 0 20px; font-size: 13px; color: var(--color-text-3); flex: 1; }
.billing-features li + li { margin-top: 8px; }
.billing-addon { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; }
.billing-addon .grow { flex: 1; min-width: 180px; }
.billing-addon h2 { margin-bottom: 4px; }
.billing-addon p { margin: 0; }
.billing-table-wrap { overflow-x: auto; }
.billing-table { border-collapse: collapse; width: 100%; font-size: 14px; }
.billing-table th, .billing-table td { text-align: left; padding: 12px; border-bottom: 1px solid var(--color-border); white-space: nowrap; }
.billing-table th { background: var(--color-fill-1); font-weight: 600; }
@media (max-width: 1200px) { .billing-plans { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 600px) {
  .billing-plans, .billing-quotas { grid-template-columns: minmax(0, 1fr); }
  .billing-quotas { gap: 20px; }
  .billing-price-note { min-height: 0; }
  .billing-addon { gap: 16px; }
  .billing-addon .grow { flex-basis: 100%; }
  .billing-addon .btn { margin-left: auto; }
  .topbar .brand { font-size: 14px; gap: 6px; }
  .topbar .toolbar { gap: 2px; }
  .topbar .btn { padding-left: 8px; padding-right: 8px; }
}

.page-head > :first-child { flex: 1 1 240px; min-width: 0; }
.page-head > .toolbar { flex: 0 0 auto; margin-left: auto; }

/* 编辑资料弹窗 */
.profile-edit-avatar { display: flex; flex-direction: column; align-items: center; gap: 10px; margin-bottom: 18px; }
.profile-edit-avatar-actions { display: flex; gap: 8px; align-items: center; }
.profile-edit-avatar-actions label.btn { cursor: pointer; }

/* 我的（个人资料页） */
.me-header { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.me-header .grow { min-width: 0; }
.me-name { font-size: 19px; font-weight: 700; color: var(--color-text-1); }
.me-membership .billing-current-head { margin-bottom: 4px; }
.me-membership .billing-quotas { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; margin-top: 16px; }
.me-group { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); margin-top: 16px; overflow: hidden; }
.me-row { display: flex; align-items: center; justify-content: space-between; gap: 10px; width: 100%; padding: 14px 18px; border: 0; background: none; font: inherit; color: inherit; text-align: left; border-bottom: 1px solid var(--border); }
.me-row:last-child { border-bottom: 0; }
.me-row.click, a.me-row { cursor: pointer; }
.me-row:hover { background: #f9fafb; }
.me-row .arrow { color: var(--color-text-placeholder); }
.me-row.danger { color: var(--red); font-weight: 600; justify-content: center; cursor: pointer; }
@media (max-width: 600px) { .me-header { text-align: center; justify-content: center; } }