:root {
  --ink: #1F2A44;
  --muted: #6B778C;
  --paper: #FFFDF7;
  --line: #E8E2D6;
  --coral: #F2654A;
  --teal: #0F8B8D;
  --sun: #FFC24B;
  --heart: #EB6D98;
  --primary: #41B5C2;
  --junior: #DB7A0E;
  --senior: #5A92E5;
  --green: #5E8034;
  --yellow: #FACA2E;
  --red: #D4042D;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--teal); }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }

.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 22px;
  padding: 14px 28px;
  background: rgba(255,253,247,.94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand {
  font-weight: 800; font-size: 26px; letter-spacing: .5px; color: var(--coral);
  white-space: nowrap;
}
.motto { color: var(--muted); font-size: 14px; white-space: nowrap; }
.search { display: flex; flex: 1; max-width: 520px; margin-left: auto; }
.search input {
  flex: 1; border: 1px solid var(--line); border-right: 0; border-radius: 999px 0 0 999px;
  padding: 9px 14px; background: #fff; outline: none;
}
.search input:focus { border-color: var(--teal); }
.search button {
  border: 1px solid var(--line); border-left: 0; border-radius: 0 999px 999px 0;
  padding: 0 18px; background: var(--ink); color: #fff;
}
.userbox { display: flex; align-items: center; gap: 14px; font-size: 14px; white-space: nowrap; }
.userbox .hello { color: var(--muted); }
.linkbtn { border: 0; background: none; color: var(--muted); padding: 0; }
.linkbtn:hover { color: var(--coral); }

.layout { display: flex; max-width: 1440px; margin: 0 auto; min-height: calc(100vh - 70px); }
.sidebar {
  width: 268px; flex: 0 0 268px;
  padding: 22px 18px 40px;
  border-right: 1px solid var(--line);
}
.main { flex: 1; padding: 28px 34px 60px; min-width: 0; }
.main.full { max-width: 1180px; margin: 0 auto; padding: 0 28px 60px; }

.side-label { margin: 18px 8px 8px; font-size: 12px; letter-spacing: 1px; color: var(--muted); }
.stages { display: flex; flex-direction: column; gap: 6px; }
.stage {
  display: block; padding: 10px 12px; border-radius: 12px; font-weight: 700; color: var(--muted);
}
.stage:hover { background: #fff; color: var(--ink); }
.stage.active { background: #fff; color: var(--ink); box-shadow: 0 0 0 1px var(--line); }
.stage.active::before {
  content: ""; display: inline-block; width: 4px; height: 16px; margin-right: 8px;
  vertical-align: -3px; border-radius: 4px; background: var(--coral);
}
.chips { display: flex; flex-wrap: wrap; gap: 7px; }
.chip {
  display: inline-block; padding: 5px 11px; border: 1px solid var(--line); border-radius: 999px;
  font-size: 13px; color: var(--muted); background: #fff;
}
.chip:hover { border-color: var(--teal); color: var(--teal); }
.chip.active { background: var(--ink); border-color: var(--ink); color: #fff; }
.side-card {
  margin-top: 26px; padding: 14px; border-radius: 14px; background: #FFF4E5; border: 1px solid #F7DFC2;
}
.side-card-title { font-weight: 800; color: #A45500; margin-bottom: 4px; }
.side-card p { margin: 0; font-size: 13px; color: #8A5A2B; }

.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.page-head h1 { margin: 4px 0 4px; font-size: 34px; line-height: 1.2; }
.kicker { color: var(--coral); font-weight: 800; letter-spacing: 2px; font-size: 12px; text-transform: uppercase; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.hint { color: var(--muted); font-size: 13px; }
.error { background: #FFECE8; border: 1px solid #FFC9BE; color: #A42A1A; padding: 10px 14px; border-radius: 10px; margin: 12px 0; }
.flash { max-width: 1100px; margin: 16px auto 0; padding: 10px 16px; background: #E9F7EF; border: 1px solid #C8EBD6; color: #256B45; border-radius: 10px; }

.stat-card {
  width: 260px; flex: 0 0 260px; padding: 16px 18px; border: 1px solid var(--line);
  border-radius: 16px; background: #fff;
}
.stat-row { display: flex; justify-content: space-between; color: var(--muted); font-size: 14px; }
.stat-row b { color: var(--ink); font-size: 18px; }
.bar { position: relative; height: 12px; margin: 12px 0 8px; border-radius: 999px; overflow: hidden; background: #F0ECE3; }
.bar-total { position: absolute; inset: 0; background: #E7E1D5; }
.bar-read { position: absolute; left: 0; top: 0; bottom: 0; background: linear-gradient(90deg, var(--teal), #46C3B6); }
.stat-foot { font-size: 13px; color: var(--muted); }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
.card {
  display: flex; flex-direction: column; min-height: 190px; padding: 18px;
  background: #fff; border: 1px solid var(--line); border-top: 4px solid var(--stage, var(--primary));
  border-radius: 16px; transition: transform .15s ease, box-shadow .15s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 12px 24px rgba(31,42,68,.08); }
.card-top { display: flex; justify-content: space-between; gap: 10px; font-size: 12px; color: var(--muted); }
.subject { font-weight: 700; color: var(--stage, var(--primary)); }
.unit { text-align: right; }
.card h3 { margin: 10px 0 8px; font-size: 19px; line-height: 1.35; }
.card-summary { margin: 0 0 14px; color: var(--muted); font-size: 13px; flex: 1; }
.card-foot { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.mastery { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
.dot { width: 12px; height: 12px; border-radius: 50%; border: 1.5px solid #C9C2B4; background: #fff; display: inline-block; }
.dot.level-understood { background: var(--green); border-color: var(--green); }
.dot.level-partial { background: var(--yellow); border-color: var(--yellow); }
.dot.level-lost { background: var(--red); border-color: var(--red); }

.empty { padding: 70px 20px; text-align: center; border: 1px dashed var(--line); border-radius: 18px; background: #fff; }
.empty-face { font-size: 24px; font-weight: 800; color: var(--coral); margin-bottom: 10px; }
.empty p { color: var(--muted); max-width: 500px; margin: 0 auto 18px; }

.primary, .ghost {
  display: inline-block; padding: 10px 18px; border-radius: 999px; border: 1px solid transparent;
  font-weight: 700; font-size: 14px;
}
.primary { background: var(--ink); color: #fff; }
.primary:hover { background: #2E3D5E; color: #fff; }
.primary.small, .ghost.small { padding: 6px 12px; font-size: 13px; }
.ghost { border-color: var(--line); background: #fff; color: var(--ink); }
.ghost:hover { border-color: var(--teal); color: var(--teal); }

.hero { padding: 70px 10px 50px; max-width: 900px; }
.hero-kicker { color: var(--coral); font-weight: 900; letter-spacing: 4px; font-size: 13px; }
.hero h1 { font-size: clamp(38px, 6vw, 68px); line-height: 1.08; margin: 14px 0 18px; letter-spacing: -1px; }
.hero-lead { font-size: 19px; color: var(--muted); max-width: 680px; }
.hero-actions { display: flex; gap: 12px; margin: 28px 0 40px; }
.hero-quote { font-family: Georgia, "Songti SC", serif; font-size: 20px; color: var(--teal); border-left: 4px solid var(--sun); padding-left: 16px; }
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; padding-bottom: 60px; }
.feature { padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
.feature b { display: block; margin-bottom: 6px; }
.feature span { color: var(--muted); font-size: 14px; }

.auth { max-width: 460px; margin: 60px auto; padding: 28px; background: #fff; border: 1px solid var(--line); border-radius: 20px; }
.auth.wide { max-width: 560px; }
.auth h1 { margin: 0 0 8px; font-size: 30px; }
.form { display: flex; flex-direction: column; gap: 14px; margin-top: 18px; }
.form label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 700; }
.form input, .form select, .form textarea, .note-box textarea {
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: #fff; outline: none; font-weight: 400;
}
.form input:focus, .form select:focus, .form textarea:focus, .note-box textarea:focus { border-color: var(--teal); }
.form-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.form .primary { margin-top: 6px; }

.material-stage { --stage: var(--primary); }
.material-stage.stage-小学 { --stage: var(--primary); }
.material-stage.stage-初中 { --stage: var(--junior); }
.material-stage.stage-高中 { --stage: var(--senior); }
.material-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 18px; margin-bottom: 16px; }
.material-head h1 { margin: 4px 0 4px; font-size: 30px; }
.wrench {
  width: 46px; height: 46px; border-radius: 50%; border: 1px solid var(--line); background: #fff; font-size: 20px;
}
.wrench:hover { border-color: var(--stage); }
.viewer {
  background: #EDE8DE; border: 1px solid var(--line); border-radius: 16px; overflow: hidden;
  height: min(72vh, 820px);
}
.viewer iframe { width: 100%; height: 100%; border: 0; background: #fff; }
.viewer-empty { height: 100%; display: grid; place-items: center; color: var(--muted); }
.material-actions {
  display: flex; flex-wrap: wrap; align-items: center; gap: 18px;
  margin: 16px 0; padding: 14px 18px; background: #fff; border: 1px solid var(--line); border-radius: 16px;
}
.inline { display: inline-flex; align-items: center; gap: 6px; margin: 0; }
.heart { border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 7px 13px; color: var(--muted); }
.heart.on { color: var(--heart); border-color: #F5C6D8; background: #FFF3F7; }
.mastery-set { display: flex; align-items: center; gap: 8px; }
.label { font-size: 13px; color: var(--muted); }
.pill { border: 1px solid var(--line); background: #fff; border-radius: 999px; padding: 6px 12px; color: var(--muted); }
.pill.active.understood { background: #EDF3E3; border-color: var(--green); color: var(--green); }
.pill.active.partial { background: #FFF7D6; border-color: var(--yellow); color: #8A6A00; }
.pill.active.lost { background: #FFE9EC; border-color: var(--red); color: var(--red); }
.rating { display: flex; align-items: center; gap: 8px; flex: 1; min-width: 280px; }
.rating input[type=range] { flex: 1; accent-color: var(--stage); }
.easy, .hard { font-size: 12px; color: var(--muted); }
.tools-panel {
  display: none; margin: 12px 0; padding: 16px; background: #fff; border: 1px solid var(--line); border-radius: 16px;
}
.tools-panel.open { display: block; }
.tools-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; }
.tool { display: flex; gap: 10px; padding: 10px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.tool:hover { border-color: var(--stage); }
.tool-icon {
  width: 38px; height: 38px; flex: 0 0 38px; display: grid; place-items: center;
  border-radius: 10px; background: var(--stage); color: #fff; font-weight: 800;
}
.tool b { display: block; font-size: 14px; }
.tool small { display: block; color: var(--muted); font-size: 12px; line-height: 1.4; }
.note-box { margin: 18px 0; padding: 16px; background: #fff; border: 1px solid var(--line); border-radius: 16px; }
.note-head { display: flex; justify-content: space-between; margin-bottom: 8px; }
.note-box textarea { width: 100%; resize: vertical; }
.note-box button { margin-top: 8px; }

.tool-card { min-height: 170px; }
.tool-top { display: flex; justify-content: space-between; align-items: center; }
.tools-list .card { border-top-color: var(--teal); }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 12px; margin-bottom: 22px; }
.stat-box { padding: 14px 16px; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
.stat-box span { display: block; color: var(--muted); font-size: 13px; }
.stat-box b { font-size: 26px; }
.panel { margin: 20px 0; padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 16px; }
.panel h2 { margin: 0 0 14px; font-size: 20px; }
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { text-align: left; padding: 10px 8px; border-bottom: 1px solid #F0ECE3; vertical-align: middle; }
.table th { color: var(--muted); font-size: 12px; font-weight: 700; letter-spacing: .5px; }
.table tr:last-child td { border-bottom: 0; }
.status { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; }
.status.published { background: #E9F7EF; color: #256B45; }
.status.draft { background: #FFF4E5; color: #A45500; }
.ops { display: flex; gap: 6px; flex-wrap: wrap; }
.tiny { width: 150px; padding: 5px 8px; border: 1px solid var(--line); border-radius: 8px; }

@media (max-width: 900px) {
  .motto { display: none; }
  .layout { display: block; }
  .sidebar { width: 100%; border-right: 0; border-bottom: 1px solid var(--line); }
  .stages { flex-direction: row; }
  .main { padding: 20px 18px 50px; }
  .page-head { flex-direction: column; align-items: flex-start; }
  .stat-card { width: 100%; flex: auto; }
  .form-row { grid-template-columns: 1fr; }
  .search { display: none; }
  .userbox { margin-left: auto; gap: 10px; }
}

.note-foot { display: flex; align-items: center; gap: 12px; margin-top: 10px; }
.flash-once { color: var(--stage); font-weight: 600; }


.code-box { font-family: ui-monospace, Consolas, monospace; font-size: 30px; letter-spacing: 3px; text-align: center; padding: 18px; margin: 18px 0; background: #fff; border: 1px solid var(--line); border-radius: 14px; }
.mono { font-family: ui-monospace, Consolas, monospace; font-size: 12px; color: var(--muted); }


.head-ops { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.grid-form { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.form-actions { grid-column: 1 / -1; }
.stat-box.active { border-color: var(--brand, #F2654A); box-shadow: 0 0 0 2px rgba(242,101,74,.15); }
.ops form.inline { margin-right: 6px; }