@import url("https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Inter+Tight:wght@300..700&family=JetBrains+Mono:wght@400;500&display=swap");

:root {
  --bg: #08090c;
  --panel: #12131a;
  --card: #191a23;
  --card-2: #101117;
  --input: #0d0e13;
  --border: #272a38;
  --border-2: #383b4c;
  --text: #f2f0fa;
  --muted: #9a9aac;
  --dim: #686a7a;
  --violet: #7d6ee8;
  --violet-2: #b1a7ff;
  --mint: #63d6b4;
  --warm: #e2b45f;
  --rose: #f07f99;
  --font: "Inter Tight", system-ui, sans-serif;
  --display: "Instrument Serif", Georgia, serif;
  --mono: "JetBrains Mono", Consolas, monospace;
}

html[data-theme="day"] {
  --bg: #f6f7fb;
  --panel: #ffffff;
  --card: #ffffff;
  --card-2: #f0f3f9;
  --input: #ffffff;
  --border: #dce2ee;
  --border-2: #c6cfdf;
  --text: #162033;
  --muted: #56627a;
  --dim: #7a8598;
  --violet: #6657dc;
  --violet-2: #705ee8;
  --mint: #168f75;
  --warm: #be7d18;
  --rose: #c94d71;
  color-scheme: light;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
}
button, input, select { font: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }

html[data-theme="day"] body {
  background:
    linear-gradient(rgba(22,32,51,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22,32,51,.045) 1px, transparent 1px),
    radial-gradient(circle at 16% 0%, rgba(112,94,232,.16), transparent 30%),
    radial-gradient(circle at 86% 12%, rgba(22,143,117,.12), transparent 34%),
    var(--bg);
  background-size: 28px 28px, 28px 28px, auto, auto, auto;
}

.topbar {
  min-height: 68px;
  display: grid;
  grid-template-columns: minmax(210px, 1fr) auto minmax(170px, 1fr);
  align-items: center;
  gap: 18px;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg), transparent 4%);
  box-shadow: 0 10px 28px rgba(0,0,0,.16);
}
.brand {
  font-family: var(--display);
  font-size: 20px;
}
.brand em { color: var(--violet-2); }
.brand-button {
  border: 0;
  background: transparent;
  color: var(--text);
  padding: 0;
  cursor: pointer;
}
.brand-button:hover em {
  color: var(--mint);
}
.mono {
  font-family: var(--mono);
  letter-spacing: .1em;
  text-transform: uppercase;
  font-size: 10px;
  color: var(--dim);
}
.top-actions, .brand-row, .top-status, .top-nav { display: flex; align-items: center; gap: 10px; }
.brand-row {
  flex: 0 0 auto;
  min-width: 0;
}
.top-actions {
  position: relative;
  flex: 1 1 auto;
  min-width: 0;
  justify-content: flex-end;
}
.top-status {
  flex-wrap: wrap;
  min-width: 0;
  justify-content: flex-end;
}
.top-nav {
  justify-self: center;
  min-height: 44px;
  padding: 4px;
  border: 1px solid color-mix(in srgb, var(--border), white 8%);
  border-radius: 14px;
  background: rgba(17,20,30,.78);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.05), 0 12px 26px rgba(0,0,0,.12);
}
.context-chip, .course-pill, .chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card);
  color: var(--muted);
  padding: 4px 9px;
  font-size: 12px;
}
.top-status .context-chip {
  justify-content: center;
  min-height: 36px;
  min-width: 108px;
  border-radius: 999px;
  border-color: rgba(125,110,232,.18);
  background: rgba(255,255,255,.04);
  white-space: nowrap;
  text-align: center;
  color: #d8def3;
  padding: 7px 11px;
}
.top-label {
  display: block;
  margin-bottom: 1px;
  font-family: var(--mono);
  color: #8790ad;
  font-size: 8.5px;
  letter-spacing: .08em;
  line-height: 1;
  text-transform: uppercase;
}
.course-dot { width: 6px; height: 6px; border-radius: 999px; background: var(--mint); }
.role-dot { background: var(--violet-2); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-2);
  border-radius: 6px;
  background: var(--card);
  color: var(--text);
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 650;
  line-height: 1;
}
.btn.primary { background: #7667e8; border-color: #8b7dff; color: white; }
.btn.ghost { background: transparent; border-color: transparent; color: var(--muted); }
.btn.icon { width: 28px; height: 28px; padding: 0; }
.btn:disabled {
  opacity: .45;
  cursor: not-allowed;
}
.skill-tree-link {
  font-weight: 700;
  min-width: 116px;
  min-height: 38px;
  border-radius: 8px;
  text-align: center;
  box-shadow: 0 8px 22px rgba(118,103,232,.26);
}
.top-nav-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 124px;
  min-height: 40px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: #b8c0dc;
  padding: 10px 16px;
  font-size: 14.5px;
  font-weight: 750;
  line-height: 1;
  text-align: center;
}
.top-nav-button:hover,
.top-nav-button.active {
  background: rgba(255,255,255,.08);
  color: #ffffff;
}
.top-nav-button.active {
  background: #7667e8;
  box-shadow: 0 8px 18px rgba(118,103,232,.28);
}
.account-button {
  display: grid;
  place-items: center;
  gap: 2px;
  min-width: 184px;
  max-width: 230px;
  min-height: 46px;
  border: 1px solid #30354a;
  border-radius: 10px;
  background: #11141e;
  color: var(--text);
  padding: 8px 14px;
  text-align: center;
}
.account-button:hover {
  border-color: #4b5575;
  background: #171c2a;
}
.account-name {
  width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 15px;
  font-weight: 700;
}
.account-action {
  color: #9da6c4;
  font-size: 12px;
  line-height: 1;
}
.account-menu {
  position: absolute;
  z-index: 40;
  top: calc(100% + 10px);
  right: 0;
  width: min(300px, calc(100vw - 28px));
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(17,20,30,.98);
  box-shadow: 0 24px 70px rgba(0,0,0,.36);
  padding: 10px;
}
.account-menu-head {
  padding: 10px 10px 12px;
  border-bottom: 1px solid var(--border);
}
.account-menu-head strong,
.account-menu-head span {
  display: block;
}
.account-menu-head strong {
  overflow: hidden;
  color: var(--text);
  font-size: 16px;
  font-weight: 800;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.account-menu-head span {
  margin-top: 3px;
  color: var(--muted);
  font-size: 13px;
}
.account-menu-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 10px;
  border-bottom: 1px solid rgba(255,255,255,.06);
}
.account-menu-row span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}
.account-menu-row i {
  display: inline-block;
  flex: 0 0 auto;
}
.account-menu-row strong {
  color: var(--text);
  font-size: 14px;
  font-weight: 750;
  text-align: right;
}
.account-menu-action {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 44px;
  margin-top: 8px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: rgba(255,255,255,.04);
  color: var(--text);
  padding: 11px 12px;
  font-size: 14.5px;
  font-weight: 750;
}
.account-menu-action:hover {
  border-color: #58617f;
  background: rgba(255,255,255,.08);
}
.account-menu-action.danger {
  color: #ffd5de;
}
.theme-button {
  min-width: 104px;
  min-height: 38px;
  border-radius: 10px;
  background: #181d2a;
  color: #dce3f8;
  border-color: #343b54;
  text-align: center;
}
.theme-button:hover {
  background: #20283b;
  border-color: #58617f;
}
.entry-top-actions {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 5;
  display: flex;
  gap: 10px;
  align-items: center;
}
.skill-tree-entry {
  font-weight: 700;
}

.entry-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 84px 28px 32px;
  background:
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px),
    radial-gradient(circle at 50% 0%, rgba(125,110,232,.22), transparent 30%),
    radial-gradient(circle at 88% 28%, rgba(99,214,180,.09), transparent 28%),
    var(--bg);
  background-size: 24px 24px, 24px 24px, auto, auto, auto;
}
.entry-panel {
  width: min(1040px, 100%);
  border: 1px solid var(--border);
  border-radius: 20px;
  background:
    linear-gradient(135deg, rgba(25,26,35,.96), rgba(13,14,20,.96)),
    var(--panel);
  box-shadow: 0 28px 80px rgba(0,0,0,.42);
  padding: 0;
  overflow: hidden;
}
.auth-panel {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, .95fr);
  min-height: 590px;
}
.register-panel {
  width: min(980px, 100%);
  min-height: 560px;
}
.entry-hero {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(34px, 5vw, 58px);
  background:
    linear-gradient(180deg, rgba(125,110,232,.12), transparent 58%),
    radial-gradient(circle at 20% 18%, rgba(177,167,255,.18), transparent 32%);
}
.entry-hero::after {
  content: "";
  position: absolute;
  inset: auto 42px 38px 42px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(177,167,255,.42), transparent);
}
.entry-brand {
  align-self: flex-start;
  font-size: 30px;
  margin-bottom: 10px;
}
.entry-panel h1 {
  max-width: 520px;
  margin: 44px 0 16px;
  font-family: var(--display);
  font-size: clamp(42px, 6vw, 72px);
  font-weight: 400;
  line-height: .92;
}
.entry-lede {
  max-width: 460px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.55;
}
.entry-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.single-entry-grid {
  grid-template-columns: minmax(0, 1fr);
}
.single-entry-grid .entry-card {
  width: min(680px, 100%);
}
.entry-card {
  min-width: 0;
}
.auth-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-left: 1px solid var(--border);
  background: rgba(12, 13, 19, .54);
  padding: clamp(28px, 4.2vw, 48px);
}
.entry-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 10px;
}
.entry-eyebrow {
  margin-bottom: 6px;
  font-family: var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
  font-size: 11px;
  color: #8d96b3;
}
.entry-role {
  font-size: 30px;
  font-weight: 700;
  line-height: 1.1;
}
.role-badge {
  flex: 0 0 auto;
  border: 1px solid rgba(177,167,255,.38);
  border-radius: 999px;
  background: rgba(125,110,232,.14);
  color: var(--violet-2);
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 700;
}
.entry-copy {
  color: var(--muted);
  max-width: 390px;
  font-size: 18px;
  line-height: 1.5;
  margin-bottom: 28px;
}
.entry-actions {
  margin: 16px 0 14px;
}
.compact-login {
  margin-top: 0;
}
.entry-actions .btn,
.entry-form .btn {
  width: 100%;
}
.entry-form {
  display: grid;
  gap: 13px;
  padding-top: 0;
  border-top: 0;
}
.login-form {
  margin-top: 0;
}
.register-link {
  margin: 0;
}
.role-toggle {
  width: 100%;
  margin-top: 12px;
}
.role-switch {
  display: flex;
  gap: 8px;
  margin: 0 0 14px;
}
.auth-switch {
  width: fit-content;
  margin-top: 28px;
  padding: 5px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(8,9,12,.56);
}
.auth-switch .chip {
  min-width: 112px;
  min-height: 38px;
  justify-content: center;
  border-color: transparent;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}
.auth-switch .chip.active {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.entry-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 34px;
}
.entry-highlights span {
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255,255,255,.04);
  color: var(--muted);
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 700;
}
.register-only-form {
  border-top: 0;
  padding-top: 0;
}
.field-label {
  display: grid;
  gap: 9px;
  color: #c0c7df;
  font-size: 14px;
  font-weight: 750;
}
.entry-input {
  width: 100%;
  border: 1px solid var(--border-2);
  background: rgba(8,9,12,.72);
  color: var(--text);
  border-radius: 12px;
  padding: 15px 16px;
  outline: none;
  font-size: 15.5px;
}
.entry-input:focus {
  border-color: var(--violet-2);
  box-shadow: 0 0 0 3px rgba(177,167,255,.16);
}
.auth-submit {
  margin-top: 8px;
  min-height: 52px;
  font-weight: 750;
  font-size: 15.5px;
}
.guest-button {
  min-height: 50px;
  background: rgba(255,255,255,.04);
  font-size: 15px;
  font-weight: 750;
}
.entry-separator {
  position: relative;
  display: grid;
  place-items: center;
  color: var(--dim);
  font-size: 12px;
}
.entry-separator::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: var(--border);
}
.entry-separator span {
  position: relative;
  z-index: 1;
  background: #11121a;
  padding: 0 10px;
}
.auth-card-foot {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 24px;
  color: var(--muted);
  font-size: 16px;
}
.text-button {
  border: 0;
  background: transparent;
  color: var(--violet-2);
  padding: 0;
  font-weight: 700;
  font-size: 16px;
}
.auth-message {
  border: 1px solid var(--border-2);
  border-radius: 10px;
  padding: 10px 12px;
  margin: 0 0 16px;
  font-size: 13px;
  line-height: 1.35;
}
.auth-message.bad {
  color: var(--rose);
  border-color: rgba(240,127,153,.45);
  background: rgba(240,127,153,.08);
}
.auth-message.good {
  color: var(--mint);
  border-color: rgba(99,214,180,.45);
  background: rgba(99,214,180,.08);
}

.layout {
  height: calc(100vh - 68px);
  display: grid;
  grid-template-columns: minmax(290px, 24vw) minmax(0, 1fr) minmax(300px, 26vw);
}
.layout.with-classroom-banner {
  height: calc(100vh - 186px);
}
.panel {
  min-width: 0;
  background: var(--panel);
  border-color: var(--border);
  display: flex;
  flex-direction: column;
}
.left { border-right: 1px solid var(--border); }
.right { border-left: 1px solid var(--border); }
.panel-head { padding: 16px; }
.search {
  width: 100%;
  border: 1px solid var(--border-2);
  background: var(--input);
  color: var(--text);
  border-radius: 6px;
  padding: 9px 10px;
  margin-top: 14px;
}
.filter-group { padding: 0 16px 10px; }
.chip-row { display: flex; gap: 5px; flex-wrap: wrap; margin-top: 6px; }
.chip { padding: 4px 8px; background: transparent; cursor: pointer; }
.chip.active { border-color: var(--violet); color: var(--violet-2); background: rgba(125, 110, 232, .12); }
.kc-link {
  border: 0;
  background: transparent;
  color: var(--violet-2);
  padding: 0;
  font: inherit;
  text-align: left;
}
.kc-link:hover { text-decoration: underline; }
.kc-link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}
.chapter-group { padding: 10px 16px; border-top: 1px solid var(--border); }
.chapter-toggle {
  width: 100%;
  display: flex;
  justify-content: space-between;
  border: 1px solid var(--border);
  color: var(--muted);
  background: var(--card-2);
  padding: 7px 9px;
  border-radius: 5px;
  text-transform: uppercase;
  letter-spacing: .05em;
  font-size: 12px;
}
.scroll { overflow: auto; flex: 1; }
.pkg-card, .suggest-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  padding: 12px;
  margin-top: 8px;
}
.pkg-card:hover, .suggest-card:hover { border-color: rgba(125, 110, 232, .55); }
.pkg-card.on-canvas {
  opacity: .78;
  background: rgba(25, 26, 35, .64);
  cursor: default;
}
.pkg-card.on-canvas:hover {
  border-color: var(--border);
}
.pkg-card.student-hidden-package {
  border-style: dashed;
}
.pkg-title { font-weight: 600; line-height: 1.25; margin-bottom: 5px; }
.pkg-meta { color: var(--dim); font-size: 12px; display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.classroom-package-status {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 26px;
  margin: 8px 0 2px;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 11px;
  font-weight: 850;
}
.classroom-package-status.published {
  border-color: rgba(99,214,180,.4);
  background: rgba(99,214,180,.1);
  color: var(--mint);
}
.classroom-package-status.draft,
.classroom-package-status.hidden {
  border-color: rgba(226,180,95,.34);
  background: rgba(226,180,95,.08);
  color: var(--warm);
}
.pkg-action-row {
  display: flex;
  justify-content: flex-end;
  gap: 6px;
  flex-wrap: wrap;
}
.pkg-action-row .btn {
  min-height: 30px;
  padding: 7px 9px;
  font-size: 12px;
}
.diff-dots {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  vertical-align: middle;
}
.diff-dot {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  border: 1px solid rgba(125, 110, 232, .5);
  background: transparent;
}
.diff-dot.active {
  background: var(--violet);
  border-color: var(--violet);
  box-shadow: 0 0 8px rgba(125, 110, 232, .35);
}
.standard { color: var(--violet-2); border-color: rgba(125, 110, 232, .5); font-family: var(--mono); font-size: 10px; }
.card-actions { margin-top: 10px; display: flex; justify-content: space-between; align-items: center; gap: 10px; }

.canvas {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at center, rgba(125,110,232,.08), transparent 30%),
    linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
  background-size: auto, 24px 24px, 24px 24px;
}
.canvas-empty {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--muted);
}
.canvas-empty h1 {
  margin: 0 0 12px;
  font-family: var(--display);
  font-size: 54px;
  font-weight: 400;
}
.canvas-node {
  position: absolute;
  z-index: 4;
  width: 132px;
  height: 132px;
  border-radius: 999px;
  border: 1px solid var(--violet);
  background: #19152a;
  color: var(--text);
  display: grid;
  place-items: center;
  text-align: center;
  padding: 15px;
  box-shadow: 0 0 0 4px rgba(125,110,232,.14), 0 14px 30px rgba(0,0,0,.35);
  cursor: grab;
  touch-action: none;
  user-select: none;
}
.canvas-node:active { cursor: grabbing; }
.node-status {
  width: fit-content;
  margin: 7px auto 0;
  border-radius: 999px;
  padding: 3px 7px;
  font-size: 9px;
  font-weight: 850;
  line-height: 1;
  background: rgba(226,180,95,.12);
  color: var(--warm);
}
.node-status.published {
  background: rgba(99,214,180,.13);
  color: var(--mint);
}
.canvas-toolbar {
  position: absolute;
  z-index: 6;
  top: 14px;
  right: 14px;
  display: flex;
  gap: 8px;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: rgba(18, 19, 26, .86);
  backdrop-filter: blur(8px);
}
.canvas-edges {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  overflow: visible;
}
.edge path {
  fill: none;
  stroke-width: 2.4;
  opacity: 1;
}
.edge-cross-chapter path {
  stroke-width: 3.1;
  filter: drop-shadow(0 0 5px rgba(226,180,95,.45));
}
.edge text {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .05em;
  text-transform: uppercase;
  paint-order: stroke;
  stroke: var(--bg);
  stroke-width: 5px;
  stroke-linejoin: round;
}
.edge-hard_prereq path, .edge-next path, #arrow-prereq path { stroke: var(--violet); fill: var(--violet); }
.edge-hard_prereq text, .edge-next text { fill: var(--violet-2); }
.edge-sibling path, .edge-related path { stroke: var(--dim); stroke-dasharray: 5 5; opacity: .8; }
.edge-sibling text, .edge-related text { fill: var(--muted); }
.edge-composition path, #arrow-composition path { stroke: var(--warm); fill: var(--warm); }
.edge-composition text { fill: var(--warm); }
.edge-extension path, #arrow-extension path { stroke: var(--mint); fill: var(--mint); }
.edge-extension text { fill: var(--mint); }
.edge-cross-chapter text { fill: var(--warm); }
.edge-legend {
  position: absolute;
  z-index: 5;
  left: 14px;
  bottom: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: rgba(18,19,26,.9);
  color: var(--muted);
  font-size: 11px;
}
.edge-legend span { display: inline-flex; align-items: center; gap: 5px; }
.edge-legend i { width: 14px; height: 2px; display: inline-block; border-radius: 999px; }
.legend-prereq { background: var(--violet); }
.legend-sibling { background: repeating-linear-gradient(90deg, var(--dim) 0 4px, transparent 4px 7px); }
.legend-composition { background: var(--warm); }
.legend-extension { background: var(--mint); }
.rel-pill {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border-2);
  border-radius: 4px;
  padding: 2px 6px;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.rel-hard_prereq, .rel-next { color: var(--violet-2); border-color: rgba(125,110,232,.6); }
.rel-sibling, .rel-related { color: var(--muted); border-color: var(--border-2); }
.rel-composition { color: var(--warm); border-color: rgba(226,180,95,.65); }
.rel-extension { color: var(--mint); border-color: rgba(99,214,180,.65); }
.rel-pill.cross {
  color: var(--warm);
  border-color: rgba(226,180,95,.7);
  margin-left: 5px;
}
.node-title { font-size: 12px; font-weight: 700; line-height: 1.12; overflow-wrap: anywhere; }
.remove-node {
  position: absolute;
  top: -6px;
  right: -6px;
  width: 24px;
  height: 24px;
  border-radius: 999px;
  border: 1px solid var(--border-2);
  background: var(--card);
  color: var(--muted);
}

.detail { min-height: 100vh; background: var(--bg); }
.detail-head {
  min-height: 70px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  padding: 12px 24px;
  border-bottom: 1px solid var(--border);
}
.student-preview-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: rgba(226,180,95,.08);
}
.student-preview-banner.published {
  background: rgba(99,214,180,.08);
}
.student-preview-banner strong {
  display: block;
  margin: 2px 0 3px;
}
.student-preview-banner p {
  margin: 0;
  color: var(--muted);
}
.display { font-family: var(--display); font-size: 25px; }
.detail-body { display: grid; grid-template-columns: 280px minmax(0, 1fr); }
.aside { border-right: 1px solid var(--border); min-height: calc(100vh - 70px); padding: 18px; background: var(--panel); }
.main { padding: 28px; max-width: 1200px; }
.tabs { display: flex; gap: 22px; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.tab {
  background: transparent;
  border: 0;
  color: var(--muted);
  padding: 0 0 12px;
}
.tab.active { color: var(--text); border-bottom: 2px solid var(--violet); }
.card {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  padding: 16px;
  margin-bottom: 14px;
}
.answer {
  border: 1px solid rgba(99,214,180,.28);
  background: rgba(99,214,180,.06);
  color: var(--mint);
  padding: 9px 10px;
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 12px;
}
.grid2 { display: grid; grid-template-columns: 140px 1fr; gap: 8px 14px; font-size: 13px; }
.muted { color: var(--muted); }
.dim { color: var(--dim); }
.kc-row, .item-row {
  border: 1px solid var(--border);
  background: var(--input);
  border-radius: 6px;
  padding: 10px;
  margin-top: 8px;
}
.kc-row { display: grid; grid-template-columns: 30px minmax(0, 1fr) auto auto auto; gap: 10px; align-items: center; }
.kc-visibility.visible {
  border-color: rgba(99,214,180,.36);
  color: var(--mint);
  background: rgba(99,214,180,.08);
}
.kc-visibility.hidden {
  border-color: rgba(226,180,95,.34);
  color: var(--warm);
  background: rgba(226,180,95,.08);
}
.kc-button {
  width: 100%;
  color: var(--text);
  text-align: left;
  font: inherit;
  cursor: pointer;
}
.kc-button:hover { border-color: var(--violet); background: rgba(125,110,232,.1); }
.kc-row.kc-highlight {
  border-color: var(--violet);
  background: rgba(125, 110, 232, .14);
  box-shadow: 0 0 0 3px rgba(125, 110, 232, .12);
}
.kc-detail h3 { margin: 10px 0 4px; }
.mini-list { margin-top: 14px; }
.failure-pill {
  display: inline-block;
  margin: 6px 6px 0 0;
  padding: 5px 8px;
  border: 1px solid rgba(255,103,137,.4);
  border-radius: 999px;
  color: var(--rose);
  background: rgba(255,103,137,.08);
  font-size: 12px;
}
.item-top { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; }
.item-prompt { font-family: var(--mono); font-size: 13px; line-height: 1.55; }
.textbook-example {
  display: grid;
  gap: 8px;
}
.textbook-example.needs-visual {
  border-color: rgba(226, 180, 95, .35);
  background:
    linear-gradient(180deg, rgba(226, 180, 95, .06), rgba(13, 14, 19, .96));
}
.source-warning {
  border: 1px solid rgba(226, 180, 95, .32);
  background: rgba(226, 180, 95, .08);
  color: #f0d08a;
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 12px;
  line-height: 1.35;
}
.structured-summary {
  display: grid;
  gap: 6px;
  border: 1px solid var(--border);
  background: rgba(8, 9, 12, .45);
  border-radius: 6px;
  padding: 10px;
  font-size: 13px;
  line-height: 1.45;
}
.structured-summary > div {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 10px;
}
.text-extract {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px 10px;
  background: rgba(8, 9, 12, .35);
}
.text-extract summary {
  color: var(--violet-2);
  cursor: pointer;
  font-size: 12px;
}
.text-extract .item-prompt {
  margin: 8px 0 0;
  color: var(--muted);
}
.practice-set { display: grid; gap: 12px; }
.personalized-practice {
  display: grid;
  grid-template-columns: 270px minmax(0, 1fr);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--card);
}
.practice-sidebar {
  border-right: 1px solid var(--border);
  background: var(--panel);
  padding: 16px;
}
.practice-side-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 18px;
}
.practice-mode {
  min-height: 38px;
  border: 0;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 750;
  transition: color .16s ease, border-color .16s ease, background .16s ease, transform .16s ease;
}
.practice-mode:hover {
  color: var(--text);
  background: rgba(125,110,232,.06);
  transform: translateY(-1px);
}
.practice-mode.active {
  border-color: var(--mint);
  color: var(--mint);
}
.practice-sidebar-section {
  padding: 16px 0;
  border-top: 1px solid var(--border);
}
.mode-card {
  position: relative;
  display: grid;
  gap: 5px;
  margin-top: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  padding: 13px 14px;
  color: inherit;
  cursor: pointer;
  font: inherit;
  text-align: left;
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease, background .16s ease;
}
.mode-card:hover {
  transform: translateY(-2px);
  border-color: rgba(125,110,232,.42);
  box-shadow: 0 12px 24px rgba(0,0,0,.1);
}
.mode-card strong {
  color: var(--text);
}
.mode-card span {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}
.mode-card.active {
  border-color: rgba(99,214,180,.54);
  background: rgba(99,214,180,.08);
  box-shadow: inset 3px 0 0 var(--mint);
}
.practice-setting-label {
  display: grid;
  gap: 8px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 12px;
}
.practice-setting-label input {
  width: 100%;
  accent-color: var(--mint);
}
.practice-setting-label span {
  justify-self: end;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 10px;
  color: var(--text);
}
.practice-difficulty-toggle {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
  margin-top: 12px;
}
.practice-difficulty-toggle button {
  display: grid;
  place-items: center;
  min-height: 34px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--card);
  color: var(--muted);
  cursor: pointer;
  font-size: 12px;
  font-weight: 700;
  transition: transform .16s ease, border-color .16s ease, background .16s ease, color .16s ease;
}
.practice-difficulty-toggle button:hover {
  transform: translateY(-1px);
  border-color: rgba(125,110,232,.4);
  color: var(--text);
}
.practice-difficulty-toggle button.active {
  border-color: rgba(99,214,180,.55);
  color: var(--mint);
  background: rgba(99,214,180,.08);
}
.adaptive-card {
  display: grid;
  gap: 6px;
  margin-top: 14px;
  border: 1px solid rgba(99,214,180,.24);
  border-radius: 10px;
  background: rgba(99,214,180,.07);
  color: var(--muted);
  padding: 13px;
}
.adaptive-card strong {
  color: var(--text);
}
.adaptive-card b {
  color: var(--mint);
  font-size: 28px;
  line-height: 1;
}
.adaptive-card span {
  font-size: 12px;
  line-height: 1.45;
}
.practice-note {
  margin-top: 16px;
  border-left: 3px solid var(--mint);
  border-radius: 8px;
  background: rgba(99,214,180,.08);
  color: var(--muted);
  padding: 12px;
  font-size: 12px;
  line-height: 1.45;
}
.practice-main-panel {
  padding: 18px;
  background: var(--card);
}
.practice-hero {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
}
.practice-target {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: rgba(99,214,180,.12);
  color: var(--mint);
  font-size: 26px;
}
.practice-hero h2 {
  margin: 0;
  font-size: 30px;
  line-height: 1;
}
.practice-hero p {
  margin: 6px 0 0;
  color: var(--muted);
}
.ai-pill {
  margin-left: auto;
  border: 1px solid rgba(226,180,95,.28);
  border-radius: 8px;
  background: rgba(226,180,95,.08);
  color: var(--warm);
  padding: 8px 11px;
  font-size: 12px;
  font-weight: 800;
}
.practice-info {
  border: 1px solid rgba(99,214,180,.26);
  border-radius: 8px;
  background: rgba(99,214,180,.08);
  color: var(--muted);
  padding: 10px 12px;
  font-size: 12px;
  line-height: 1.45;
  margin-bottom: 14px;
}
.practice-run-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  margin-bottom: 12px;
}
.practice-run-head strong,
.practice-run-head span {
  margin-right: 8px;
}
.practice-run-head span {
  display: inline-flex;
  border-radius: 999px;
  background: rgba(125,110,232,.1);
  color: var(--violet-2);
  padding: 4px 9px;
  font-size: 11px;
  font-weight: 750;
}
.practice-focus-kcs {
  margin-bottom: 14px;
}
.practice-focus-kcs .chip {
  max-width: 100%;
}
.practice-focus-kcs .chip span {
  color: var(--mint);
  font-family: var(--mono);
  font-size: 10px;
}
.practice-question-list {
  display: grid;
  gap: 10px;
}
.practice-preview-card {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  gap: 13px;
  align-items: start;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  padding: 14px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.practice-preview-card:hover {
  transform: translateY(-2px);
  border-color: rgba(99,214,180,.42);
  box-shadow: 0 14px 28px rgba(0,0,0,.12);
}
.practice-preview-card.expanded {
  border-color: rgba(99,214,180,.52);
  box-shadow: 0 16px 32px rgba(31,150,118,.12);
}
.practice-preview-number {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: #217a4a;
  color: white;
  font-weight: 850;
}
.practice-preview-meta {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 7px;
}
.difficulty-badge {
  border-radius: 999px;
  padding: 4px 8px;
  font-size: 11px;
  font-weight: 800;
}
.difficulty-badge.easy { color: var(--mint); background: rgba(99,214,180,.1); }
.difficulty-badge.medium { color: var(--warm); background: rgba(226,180,95,.1); }
.difficulty-badge.hard { color: var(--rose); background: rgba(240,127,153,.1); }
.adaptive-badge {
  border-radius: 999px;
  background: rgba(125,110,232,.1);
  color: var(--violet-2);
  padding: 4px 8px;
  font-size: 11px;
  font-weight: 800;
}
.practice-preview-prompt {
  color: var(--text);
  font-weight: 750;
  line-height: 1.45;
}
.practice-kc-strip {
  display: grid;
  gap: 7px;
  margin-top: 10px;
}
.practice-kc-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  align-items: center;
}
.kc-label {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.kc-chip {
  border: 1px solid rgba(125,110,232,.42);
  border-radius: 999px;
  background: rgba(125,110,232,.1);
  color: var(--violet-2);
  cursor: pointer;
  padding: 5px 9px;
  font-size: 12px;
  font-weight: 750;
  transition: transform .16s ease, border-color .16s ease, background .16s ease;
}
.kc-chip:hover {
  transform: translateY(-1px);
  border-color: rgba(125,110,232,.68);
  background: rgba(125,110,232,.16);
}
.kc-chip.support {
  border-color: var(--border);
  color: var(--muted);
  background: transparent;
}
.practice-preview-expanded {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 12px;
}
.practice-preview-expanded div {
  border: 1px solid var(--border);
  border-radius: 9px;
  background: rgba(99,214,180,.06);
  padding: 10px;
}
.practice-preview-expanded strong {
  display: block;
  color: var(--text);
  font-size: 12px;
  margin-bottom: 5px;
}
.practice-preview-expanded span {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}
.practice-preview-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}
.practice-footer-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  padding-top: 16px;
  margin-top: 16px;
  border-top: 1px solid var(--border);
}
.start-practice {
  min-width: 260px;
  background: #217a4a !important;
  border-color: #217a4a !important;
}
.practice-linked-kcs {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  color: var(--muted);
}
.practice-linked-kcs div {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.practice-linked-kcs span {
  border-radius: 999px;
  background: rgba(99,214,180,.08);
  color: var(--mint);
  padding: 4px 8px;
  font-size: 11px;
  font-weight: 750;
}
.practice-question {
  border: 1px solid var(--border);
  background: var(--input);
  border-radius: 8px;
  padding: 12px;
}
.practice-question-head,
.practice-answer-row {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}
.practice-question-head { margin-bottom: 8px; }
.practice-question-kc {
  display: grid;
  gap: 7px;
  margin-top: 10px;
}
.practice-answer-row { margin-top: 10px; }
.practice-input {
  flex: 1;
  min-width: 0;
  background: #090b11;
  border: 1px solid var(--border-2);
  border-radius: 6px;
  color: var(--text);
  padding: 10px;
}
.practice-input:focus { outline: 1px solid var(--violet); border-color: var(--violet); }
.practice-correct { border-color: rgba(99,214,180,.55); }
.practice-wrong { border-color: rgba(255,103,137,.55); }
.feedback {
  margin-top: 10px;
  border-radius: 6px;
  padding: 10px;
  font-size: 13px;
}
.feedback.good { color: var(--mint); background: rgba(99,214,180,.08); border: 1px solid rgba(99,214,180,.25); }
.feedback.bad { color: var(--rose); background: rgba(255,103,137,.08); border: 1px solid rgba(255,103,137,.25); }
.diagnosis-head {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}
.diagnosis-grid {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 6px 10px;
  color: var(--text);
}
.error-kind {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border-2);
  border-radius: 999px;
  padding: 3px 8px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .04em;
  text-transform: uppercase;
  white-space: nowrap;
}
.kind-procedural { color: var(--warm); border-color: rgba(226,180,95,.55); background: rgba(226,180,95,.1); }
.kind-conceptual { color: var(--rose); border-color: rgba(240,127,153,.55); background: rgba(240,127,153,.1); }
.kind-notational { color: var(--violet-2); border-color: rgba(177,167,255,.55); background: rgba(125,110,232,.12); }
.kind-transfer { color: var(--mint); border-color: rgba(99,214,180,.5); background: rgba(99,214,180,.09); }
.kind-strategic { color: #7fb7ff; border-color: rgba(127,183,255,.5); background: rgba(127,183,255,.09); }
.kind-boundary { color: #d7a35f; border-color: rgba(215,163,95,.55); background: rgba(215,163,95,.1); }
.kind-slip { color: var(--muted); border-color: var(--border-2); background: rgba(154,154,172,.08); }
.more-practice { margin-top: 12px; display: grid; gap: 8px; }
.mini-practice {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 8px;
}
.right-section { padding: 18px; border-bottom: 1px solid var(--border); }
.item-bank {
  min-height: calc(100vh - 68px);
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  background: var(--bg);
}
.item-bank-filters {
  border-right: 1px solid var(--border);
  background: var(--panel);
  padding: 18px;
  overflow: auto;
}
.classroom-shell {
  min-height: calc(100vh - 68px);
  padding: 28px;
  background:
    radial-gradient(circle at 20% 0%, rgba(125,110,232,.16), transparent 28%),
    var(--bg);
}
.classroom-hero {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
  max-width: 1180px;
  margin: 0 auto 18px;
}
.classroom-hero h1 {
  margin: 8px 0 8px;
  font-family: var(--display);
  font-size: clamp(42px, 6vw, 68px);
  line-height: .95;
  font-weight: 400;
}
.classroom-hero p {
  max-width: 620px;
  font-size: 17px;
  line-height: 1.5;
}
.classroom-notice {
  display: grid;
  grid-template-columns: 38px 1fr;
  gap: 12px;
  align-items: center;
  max-width: 1180px;
  margin: 0 auto 18px;
  border: 1px solid rgba(99,214,180,.36);
  border-radius: 14px;
  background: linear-gradient(90deg, rgba(99,214,180,.11), rgba(18,19,26,.88));
  color: #dfe8f7;
  padding: 14px 16px;
}
.classroom-notice.bad {
  border-color: rgba(240,127,153,.45);
  background: linear-gradient(90deg, rgba(240,127,153,.11), rgba(18,19,26,.88));
}
.notice-icon {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(99,214,180,.16);
  color: var(--mint);
  font-weight: 850;
}
.classroom-notice.bad .notice-icon {
  background: rgba(240,127,153,.16);
  color: var(--rose);
}
.classroom-notice strong {
  display: block;
  margin-bottom: 3px;
  font-size: 16px;
}
.classroom-notice p {
  margin: 0;
  color: #b8c3dd;
  font-size: 14px;
  line-height: 1.45;
}
.classroom-toast {
  position: fixed;
  top: 82px;
  right: 28px;
  z-index: 80;
  min-height: 42px;
  max-width: min(360px, calc(100vw - 32px));
  display: flex;
  align-items: center;
  border: 1px solid rgba(99,214,180,.42);
  border-radius: 10px;
  background: rgba(18,19,26,.94);
  color: #f2f7fb;
  box-shadow: 0 18px 46px rgba(0,0,0,.24);
  padding: 10px 14px;
  font-weight: 750;
}
.classroom-toast.good {
  border-color: rgba(99,214,180,.44);
}
.classroom-toast.bad {
  border-color: rgba(240,127,153,.48);
}
.classroom-create {
  display: grid;
  grid-template-columns: minmax(240px, 1fr) minmax(180px, .6fr) auto;
  gap: 12px;
  align-items: end;
  max-width: 1180px;
  margin: 0 auto 18px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(18,19,26,.82);
  padding: 16px;
}
.classroom-create .btn {
  min-height: 50px;
}
.demo-classroom-note {
  display: block;
  border-color: rgba(125,110,232,.36);
  background: linear-gradient(135deg, rgba(125,110,232,.16), rgba(18,19,26,.9));
}
.demo-classroom-note strong {
  display: block;
  margin: 6px 0;
  font-size: 20px;
}
.demo-classroom-note p {
  margin: 0;
  line-height: 1.45;
}
.enroll-code {
  text-transform: uppercase;
  letter-spacing: .08em;
}
.classroom-list-section {
  max-width: 1180px;
  margin: 0 auto;
}
.classroom-list-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 16px;
  margin: 0 0 12px;
}
.classroom-list-head h2 {
  margin: 5px 0 0;
  font-size: 24px;
  line-height: 1.1;
}
.classroom-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255,255,255,.04);
  color: var(--muted);
  padding: 6px 10px;
  font-size: 13px;
  font-weight: 750;
  white-space: nowrap;
}
.classroom-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 14px;
}
.classroom-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(18,19,26,.92);
  padding: 18px;
  box-shadow: 0 18px 50px rgba(0,0,0,.22);
}
.classroom-card-top {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
}
.classroom-card-top > div:first-child {
  min-width: 0;
}
.classroom-card h2 {
  margin: 6px 0 0;
  font-size: 24px;
  line-height: 1.1;
}
.classroom-invite-panel {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  min-width: 300px;
  padding: 0;
}
.class-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 38px;
  border: 1px solid rgba(99,214,180,.44);
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(99,214,180,.13), rgba(99,214,180,.07));
  color: var(--mint);
  padding: 7px 13px 7px 15px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.05);
  transition: transform .16s ease, border-color .16s ease, background .16s ease, box-shadow .16s ease, color .16s ease;
}
.class-code span {
  font-family: var(--font);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  color: var(--text);
}
.class-code strong {
  font: inherit;
  color: var(--mint);
  padding-left: 2px;
}
.class-code-button {
  cursor: pointer;
}
.class-code-button:hover,
.class-code-button:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(99,214,180,.78);
  background: linear-gradient(180deg, rgba(99,214,180,.2), rgba(99,214,180,.1));
  box-shadow: 0 0 0 3px rgba(99,214,180,.12), 0 10px 24px rgba(0,0,0,.16);
}
.class-code-button:active {
  transform: translateY(0);
  box-shadow: 0 0 0 3px rgba(99,214,180,.1);
}
.classroom-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0;
}
.classroom-stats span {
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  padding: 6px 9px;
  font-size: 12px;
}
.classroom-actions {
  display: block;
}
.classroom-open {
  width: 100%;
  min-height: 42px;
}
.classroom-manage-menu {
  position: relative;
  flex: 0 0 auto;
}
.classroom-menu-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 104px;
  min-height: 38px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255,255,255,.025);
  color: #c4c6d6;
  padding: 7px 14px;
  font-size: 12.5px;
  font-weight: 800;
  transition: transform .16s ease, border-color .16s ease, background .16s ease, box-shadow .16s ease, color .16s ease;
}
.classroom-menu-button i {
  width: 7px;
  height: 7px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
  transition: transform .16s ease;
}
.classroom-menu-button:hover,
.classroom-menu-button:focus-visible,
.classroom-menu-button[aria-expanded="true"] {
  transform: translateY(-1px);
  border-color: rgba(125,110,232,.58);
  color: var(--violet-2);
  background: rgba(125,110,232,.11);
  box-shadow: 0 0 0 3px rgba(125,110,232,.09), 0 10px 24px rgba(0,0,0,.14);
}
.classroom-menu-button[aria-expanded="true"] i {
  transform: translateY(1px) rotate(225deg);
}
.classroom-menu-button:active {
  transform: translateY(0);
}
.classroom-menu-popover {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  z-index: 25;
  min-width: 210px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(18,19,26,.98);
  box-shadow: 0 22px 54px rgba(0,0,0,.34);
  padding: 7px;
}
.classroom-menu-item {
  width: 100%;
  min-height: 40px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  padding: 9px 11px;
  text-align: left;
  font-size: 13.5px;
  font-weight: 780;
  transition: background .14s ease, color .14s ease, transform .14s ease;
}
.classroom-menu-item:hover,
.classroom-menu-item:focus-visible {
  background: rgba(125,110,232,.12);
  color: var(--violet-2);
  transform: translateX(2px);
}
.classroom-menu-item.danger {
  color: #ff8ba4;
}
.classroom-menu-item.danger:hover,
.classroom-menu-item.danger:focus-visible {
  background: rgba(240,127,153,.12);
  color: var(--rose);
}
.empty-card p {
  color: var(--muted);
  line-height: 1.45;
}
.workspace-banner {
  min-height: 118px;
  padding: 14px 20px 12px;
  border-bottom: 1px solid var(--border);
  background:
    linear-gradient(90deg, rgba(125,110,232,.14), rgba(18,19,26,.92)),
    var(--panel);
}
.workspace-main {
  display: grid;
  gap: 12px;
  width: min(1420px, 100%);
  margin: 0 auto;
}
.workspace-breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  color: var(--dim);
  font-size: 12px;
  font-weight: 750;
}
.workspace-breadcrumb span,
.workspace-breadcrumb strong {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.workspace-breadcrumb strong {
  color: var(--violet-2);
  font-weight: 850;
}
.workspace-breadcrumb-link {
  border: 0;
  background: transparent;
  color: #d9d5ff;
  padding: 0;
  font-size: 12px;
  font-weight: 850;
}
.workspace-breadcrumb-link:hover,
.workspace-breadcrumb-link:focus-visible {
  color: var(--mint);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.workspace-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.workspace-banner strong {
  display: block;
  margin-top: 3px;
  font-size: 20px;
}
.workspace-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}
.workspace-actions .btn {
  min-height: 34px;
}
.classroom-subnav {
  width: fit-content;
  display: flex;
  justify-content: flex-start;
  gap: 4px;
  padding: 4px;
  border: 1px solid rgba(125,110,232,.18);
  border-radius: 12px;
  background: rgba(8,9,12,.44);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.04);
}
.classroom-tab {
  min-width: 166px;
  min-height: 36px;
  border: 1px solid transparent;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  font-weight: 750;
  text-align: center;
}
.classroom-tab:hover,
.classroom-tab.active {
  border-color: #8b7dff;
  background: rgba(118,103,232,.18);
  color: var(--text);
  box-shadow: 0 10px 24px rgba(118,103,232,.18);
}
.classroom-tab.active {
  background: #7667e8;
  color: #fff;
}
.classroom-tab {
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease, color .18s ease;
}
.classroom-tab:hover {
  transform: translateY(-1px);
}
.review-dashboard {
  max-width: 1420px;
  margin: 18px auto;
  padding: 0 18px;
}
.review-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 14px;
}
.review-icon {
  width: 58px;
  height: 58px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: #16884f;
  color: #fff;
  font-size: 28px;
  font-weight: 850;
  box-shadow: 0 16px 32px rgba(22,136,79,.18);
  transition: transform .22s ease, box-shadow .22s ease;
}
.review-head:hover .review-icon {
  transform: translateY(-2px) rotate(-4deg) scale(1.04);
  box-shadow: 0 22px 38px rgba(22,136,79,.24);
}
.review-head h2 {
  margin: 2px 0;
  font-size: 34px;
  line-height: 1;
}
.review-head p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}
.review-filters {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 12px;
}
.review-filter,
.performance-groups,
.student-table-card,
.kc-summary-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(18,19,26,.92);
}
.review-filter {
  padding: 14px 16px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease;
}
.review-filter:hover {
  transform: translateY(-2px);
  border-color: rgba(125,110,232,.48);
  box-shadow: 0 14px 30px rgba(0,0,0,.16);
}
.review-filter span {
  display: block;
  margin-bottom: 5px;
  color: var(--muted);
  font-size: 12px;
}
.review-filter strong {
  font-size: 15px;
}
.performance-groups {
  padding: 16px;
  margin-bottom: 12px;
}
.review-section-title {
  margin-bottom: 12px;
  color: var(--text);
  font-size: 17px;
  font-weight: 800;
}
.group-card-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.group-card {
  display: grid;
  grid-template-columns: 54px 1fr auto;
  align-items: center;
  gap: 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px;
  width: 100%;
  color: inherit;
  text-align: left;
  cursor: pointer;
  font: inherit;
  transform: translateY(0);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease, filter .18s ease;
}
.group-card:hover,
.group-card.active {
  transform: translateY(-3px);
  box-shadow: 0 18px 34px rgba(0,0,0,.18);
  filter: saturate(1.04);
}
.group-card.active {
  outline: 2px solid color-mix(in srgb, currentColor, transparent 72%);
  outline-offset: 2px;
}
.group-symbol {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  font-size: 24px;
  font-weight: 850;
  transition: transform .18s ease;
}
.group-card:hover .group-symbol,
.group-card.active .group-symbol {
  transform: scale(1.08) rotate(-3deg);
}
.group-card strong,
.group-card span,
.group-card small {
  display: block;
}
.group-card strong {
  font-size: 18px;
}
.group-card span {
  margin-top: 4px;
  color: var(--text);
  font-size: 16px;
}
.group-card small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
}
.group-card b {
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 20px;
}
.group-red { border-color: rgba(240,127,153,.38); background: rgba(240,127,153,.07); }
.group-red .group-symbol, .group-red b { color: #ff879d; background: rgba(240,127,153,.13); }
.group-orange { border-color: rgba(226,180,95,.4); background: rgba(226,180,95,.07); }
.group-orange .group-symbol, .group-orange b { color: #ffba6b; background: rgba(226,180,95,.13); }
.group-green { border-color: rgba(99,214,180,.38); background: rgba(99,214,180,.07); }
.group-green .group-symbol, .group-green b { color: var(--mint); background: rgba(99,214,180,.13); }
.review-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 12px;
}
.student-table-card,
.kc-summary-card {
  padding: 16px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.student-table-card:hover,
.kc-summary-card:hover {
  transform: translateY(-2px);
  border-color: rgba(125,110,232,.38);
  box-shadow: 0 18px 36px rgba(0,0,0,.16);
}
.student-table {
  display: grid;
  gap: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 10px;
}
.student-table-row {
  display: grid;
  grid-template-columns: 1.05fr .55fr 1.4fr 1.35fr 1.45fr;
  gap: 14px;
  align-items: center;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  color: #d7def3;
  font-size: 13px;
  transition: background .16s ease, transform .16s ease, color .16s ease;
}
.student-table-row:not(.head):hover {
  background: rgba(125,110,232,.08);
  transform: translateX(3px);
}
.student-table-row:not(.head) {
  cursor: pointer;
}
.student-table-row:not(.head).active {
  background: rgba(125,110,232,.14);
  box-shadow: inset 3px 0 0 var(--violet-2);
}
.student-table-row:not(.head):focus-visible {
  outline: 2px solid var(--violet-2);
  outline-offset: -2px;
}
.student-table-row:last-child {
  border-bottom: 0;
}
.student-table-row.head {
  background: rgba(255,255,255,.035);
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}
.student-table-row i {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  margin-right: 8px;
  border-radius: 50%;
  background: rgba(125,110,232,.16);
  color: var(--violet-2);
  font-style: normal;
  font-weight: 850;
  transition: transform .16s ease, background .16s ease;
}
.student-table-row:not(.head):hover i {
  transform: scale(1.08);
  background: rgba(125,110,232,.24);
}
.mastery-surviving { color: #ff879d; font-weight: 850; }
.mastery-developing { color: #ffba6b; font-weight: 850; }
.mastery-thriving { color: var(--mint); font-weight: 850; }
.summary-line {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 9px 0;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
}
.summary-line strong {
  color: var(--text);
}
.focused-student {
  border-radius: 9px;
  margin: 8px 0;
  padding: 10px 12px;
  border: 1px solid rgba(125,110,232,.32);
  background: rgba(125,110,232,.1);
}
.focused-student strong {
  color: var(--violet-2);
}
.kc-mastery-list {
  margin-top: 14px;
}
.kc-mastery-list > strong {
  display: block;
  margin-bottom: 12px;
}
.kc-mastery-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 10px;
  margin-bottom: 12px;
  color: #dce2f5;
  font-size: 13px;
  transition: transform .16s ease, color .16s ease;
}
.kc-mastery-row:hover {
  transform: translateX(3px);
}
.kc-bar {
  grid-column: 1 / -1;
  height: 7px;
  border-radius: 999px;
  background: #252a3d;
  overflow: hidden;
}
.kc-bar i {
  position: relative;
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #7667e8, var(--mint));
  overflow: hidden;
  transition: width .24s ease, filter .18s ease;
}
.kc-bar i::after,
.progress-line span::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.35), transparent);
  transform: translateX(-100%);
  animation: progressSweep 2.2s ease-in-out infinite;
}
.kc-mastery-row:hover .kc-bar i {
  filter: brightness(1.08);
}
.teacher-next-step {
  margin-top: 16px;
  border: 1px solid rgba(99,214,180,.26);
  border-radius: 10px;
  background: rgba(99,214,180,.07);
  padding: 12px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.teacher-next-step:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 26px rgba(0,0,0,.12);
  border-color: rgba(99,214,180,.45);
}
.teacher-next-step p {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.45;
}
.student-progress-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(25,26,35,.82);
  padding: 14px;
  margin-bottom: 12px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.student-progress-card:hover {
  transform: translateY(-3px);
  border-color: rgba(125,110,232,.45);
  box-shadow: 0 18px 34px rgba(0,0,0,.18);
}
.student-progress-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}
.student-progress-head strong {
  font-size: 15px;
}
.student-progress-head > span {
  color: var(--violet-2);
  font-weight: 800;
}
.progress-line {
  height: 7px;
  border-radius: 999px;
  background: #252a3d;
  overflow: hidden;
}
.progress-line span {
  position: relative;
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--violet), var(--mint));
  overflow: hidden;
}
.student-progress-meta {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  margin: 10px 0 8px;
  color: var(--muted);
  font-size: 12px;
}
@keyframes progressSweep {
  0% { transform: translateX(-100%); opacity: 0; }
  35% { opacity: .9; }
  100% { transform: translateX(100%); opacity: 0; }
}
.item-bank-count {
  font-family: var(--display);
  font-size: 34px;
  margin: 8px 0 18px;
}
.filter-label {
  display: grid;
  gap: 7px;
  margin-bottom: 14px;
  color: var(--muted);
  font-size: 12px;
}
.item-bank-results {
  padding: 24px;
  overflow: auto;
}
.item-bank-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 18px;
}
.item-bank-head h1 {
  font-family: var(--display);
  font-size: 46px;
  line-height: 1;
  font-weight: 400;
  margin: 6px 0 0;
}
.item-bank-list {
  display: grid;
  gap: 12px;
}
.item-bank-card {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  padding: 14px;
}
.item-bank-card-top {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: flex-start;
}
.item-bank-meta {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 10px;
}
.item-id-chip {
  border-color: rgba(120, 105, 225, .55);
  color: var(--violet-2);
  background: rgba(120, 105, 225, .1);
}
.item-kc-chip {
  max-width: 100%;
  text-align: left;
}
.kc-coverage {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}
.prereq-kc-chip {
  color: var(--warm);
  border-color: rgba(226,180,95,.45);
  background: rgba(226,180,95,.08);
}
.item-trace {
  margin-top: 12px;
  color: var(--muted);
}
.item-trace summary {
  cursor: pointer;
  color: var(--violet-2);
}
.item-trace li {
  margin-top: 6px;
  line-height: 1.45;
}
.prereq-kc-block {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}
.modal-bg {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.65);
  display: grid;
  place-items: center;
  z-index: 50;
}
.modal {
  width: min(920px, 92vw);
  max-height: 88vh;
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--border-2);
  border-radius: 14px;
}
.modal-head, .modal-foot {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.modal-foot { border-top: 1px solid var(--border); border-bottom: 0; justify-content: flex-end; gap: 8px; }
.modal-body { padding: 18px; }

html[data-theme="day"] .topbar {
  background: rgba(255,255,255,.92);
  box-shadow: 0 12px 34px rgba(24,36,64,.08);
}
html[data-theme="day"] .top-nav,
html[data-theme="day"] .top-status .context-chip,
html[data-theme="day"] .account-button,
html[data-theme="day"] .account-menu,
html[data-theme="day"] .theme-button {
  background: #ffffff;
  border-color: #d6deec;
  color: #27324a;
  box-shadow: 0 8px 22px rgba(24,36,64,.06);
}
html[data-theme="day"] .account-menu {
  box-shadow: 0 24px 70px rgba(24,36,64,.16);
}
html[data-theme="day"] .account-menu-head,
html[data-theme="day"] .account-menu-row {
  border-color: #e4e9f2;
}
html[data-theme="day"] .account-menu-action {
  background: #f7f9fd;
  border-color: #d8e0ed;
  color: #27324a;
}
html[data-theme="day"] .account-menu-action:hover {
  background: #eef3fb;
  border-color: #c5d0e1;
}
html[data-theme="day"] .account-menu-action.danger {
  color: #9f2f4f;
}
html[data-theme="day"] .top-nav-button {
  color: #5d6880;
}
html[data-theme="day"] .top-nav-button:hover,
html[data-theme="day"] .top-nav-button.active {
  background: #eef2fb;
  color: #172033;
}
html[data-theme="day"] .top-nav-button.active {
  background: #ebe8ff;
  color: #4638bd;
  box-shadow: inset 0 0 0 1px rgba(102,87,220,.22);
}
html[data-theme="day"] .account-button:hover,
html[data-theme="day"] .theme-button:hover {
  background: #f0f4fb;
  border-color: #b8c4da;
}
html[data-theme="day"] .account-action,
html[data-theme="day"] .top-label {
  color: #69758e;
}
html[data-theme="day"] .entry-shell {
  background:
    linear-gradient(rgba(22,32,51,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22,32,51,.045) 1px, transparent 1px),
    radial-gradient(circle at 18% 0%, rgba(112,94,232,.2), transparent 32%),
    radial-gradient(circle at 92% 18%, rgba(22,143,117,.14), transparent 35%),
    #f6f7fb;
}
html[data-theme="day"] .entry-panel {
  background: #ffffff;
  box-shadow: 0 28px 80px rgba(30,43,70,.13);
}
html[data-theme="day"] .entry-hero {
  background:
    linear-gradient(180deg, rgba(112,94,232,.13), transparent 62%),
    radial-gradient(circle at 20% 18%, rgba(22,143,117,.14), transparent 34%),
    #f4f6fb;
}
html[data-theme="day"] .auth-card {
  background: rgba(255,255,255,.72);
}
html[data-theme="day"] .auth-switch {
  background: #e9edf6;
}
html[data-theme="day"] .auth-switch .chip.active {
  background: #ffffff;
  color: #172033;
  border-color: #ffffff;
  box-shadow: 0 5px 14px rgba(24,36,64,.11);
}
html[data-theme="day"] .entry-highlights span,
html[data-theme="day"] .guest-button,
html[data-theme="day"] .entry-input,
html[data-theme="day"] .practice-input,
html[data-theme="day"] .search,
html[data-theme="day"] select,
html[data-theme="day"] textarea {
  background: #ffffff;
  color: var(--text);
}
html[data-theme="day"] .practice-input {
  border-color: #cbd5e6;
  box-shadow: inset 0 1px 0 rgba(24,36,64,.03);
}
html[data-theme="day"] .practice-input::placeholder {
  color: #7a8598;
}
html[data-theme="day"] .practice-input:focus {
  outline: 0;
  border-color: #705ee8;
  box-shadow: 0 0 0 3px rgba(112,94,232,.16), inset 0 1px 0 rgba(24,36,64,.03);
}
html[data-theme="day"] .practice-input:disabled {
  background: #eef2f8;
  color: #7a8598;
}
html[data-theme="day"] .entry-separator span {
  background: #ffffff;
}
html[data-theme="day"] .field-label {
  color: #38445c;
}
html[data-theme="day"] .layout,
html[data-theme="day"] .detail,
html[data-theme="day"] .item-bank {
  background: rgba(246,247,251,.72);
}
html[data-theme="day"] .panel,
html[data-theme="day"] .aside,
html[data-theme="day"] .item-bank-filters,
html[data-theme="day"] .modal,
html[data-theme="day"] .classroom-card,
html[data-theme="day"] .review-filter,
html[data-theme="day"] .performance-groups,
html[data-theme="day"] .student-table-card,
html[data-theme="day"] .kc-summary-card,
html[data-theme="day"] .item-bank-card {
  background: rgba(255,255,255,.92);
  box-shadow: 0 10px 28px rgba(24,36,64,.06);
}
html[data-theme="day"] .pkg-card,
html[data-theme="day"] .suggest-card,
html[data-theme="day"] .card,
html[data-theme="day"] .preview-box,
html[data-theme="day"] .trace-box,
html[data-theme="day"] .mini-practice {
  background: #ffffff;
}
html[data-theme="day"] .pkg-card.on-canvas,
html[data-theme="day"] .canvas-node,
html[data-theme="day"] .canvas-toolbar {
  background: #ffffff;
  box-shadow: 0 12px 28px rgba(24,36,64,.09);
}
html[data-theme="day"] .canvas {
  background:
    linear-gradient(rgba(22,32,51,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22,32,51,.05) 1px, transparent 1px),
    radial-gradient(circle at 50% 20%, rgba(112,94,232,.13), transparent 34%),
    #f4f6fb;
  background-size: 24px 24px, 24px 24px, auto, auto;
}
html[data-theme="day"] .canvas-empty h1,
html[data-theme="day"] .student-table-row {
  color: #22304a;
}
html[data-theme="day"] .legend,
html[data-theme="day"] .classroom-subnav {
  background: rgba(237,241,248,.86);
  border-color: #d6deec;
}
html[data-theme="day"] .detail-head,
html[data-theme="day"] .workspace-banner {
  background: linear-gradient(90deg, rgba(112,94,232,.14), rgba(255,255,255,.92));
}
html[data-theme="day"] .workspace-breadcrumb {
  color: #7a8598;
}
html[data-theme="day"] .workspace-breadcrumb-link {
  color: #4f43d3;
}
html[data-theme="day"] .workspace-breadcrumb-link:hover,
html[data-theme="day"] .workspace-breadcrumb-link:focus-visible {
  color: #168f75;
}
html[data-theme="day"] .classroom-shell {
  background:
    radial-gradient(circle at 18% 0%, rgba(112,94,232,.18), transparent 32%),
    radial-gradient(circle at 88% 6%, rgba(22,143,117,.13), transparent 30%),
    #f6f7fb;
}
html[data-theme="day"] .classroom-notice {
  border-color: rgba(22,143,117,.28);
  background: linear-gradient(90deg, rgba(22,143,117,.12), rgba(255,255,255,.96));
  color: #172033;
}
html[data-theme="day"] .classroom-notice.bad {
  background: linear-gradient(90deg, rgba(201,77,113,.1), rgba(255,255,255,.92));
}
html[data-theme="day"] .classroom-notice strong {
  color: #172033;
}
html[data-theme="day"] .classroom-notice p {
  color: #42506a;
}
html[data-theme="day"] .classroom-toast {
  background: rgba(255,255,255,.96);
  color: #172033;
  box-shadow: 0 18px 42px rgba(24,36,64,.16);
}
html[data-theme="day"] .notice-icon {
  background: rgba(22,143,117,.14);
  color: #08745f;
}
html[data-theme="day"] .classroom-create,
html[data-theme="day"] .demo-classroom-note {
  background: linear-gradient(135deg, rgba(112,94,232,.09), rgba(255,255,255,.94));
}
html[data-theme="day"] .demo-classroom-note strong {
  color: #172033;
}
html[data-theme="day"] .demo-classroom-note p,
html[data-theme="day"] .classroom-shell .muted {
  color: #42506a;
}
html[data-theme="day"] .classroom-tab {
  background: #ffffff;
  color: #5d6880;
}
html[data-theme="day"] .student-table-row.head {
  background: #eef2fb;
}
html[data-theme="day"] .student-table-row i {
  background: rgba(112,94,232,.12);
}
html[data-theme="day"] .review-filter:hover,
html[data-theme="day"] .student-table-card:hover,
html[data-theme="day"] .kc-summary-card:hover,
html[data-theme="day"] .student-progress-card:hover,
html[data-theme="day"] .teacher-next-step:hover {
  box-shadow: 0 18px 34px rgba(24,36,64,.11);
}
html[data-theme="day"] .group-card:hover,
html[data-theme="day"] .group-card.active {
  box-shadow: 0 18px 34px rgba(24,36,64,.12);
}
html[data-theme="day"] .student-table-row:not(.head):hover {
  background: rgba(112,94,232,.075);
}
html[data-theme="day"] .student-table-row:not(.head).active {
  background: rgba(112,94,232,.11);
  box-shadow: inset 3px 0 0 #705ee8;
}
html[data-theme="day"] .student-table-row:not(.head):hover i {
  background: rgba(112,94,232,.18);
}
html[data-theme="day"] .focused-student {
  background: rgba(112,94,232,.075);
  border-color: rgba(112,94,232,.24);
}
html[data-theme="day"] .focused-student strong {
  color: #4f43d3;
}
html[data-theme="day"] .progress-bar {
  background: #e3e8f2;
}
html[data-theme="day"] .kc-mastery-row {
  color: #42506a;
}
html[data-theme="day"] .kc-mastery-row strong,
html[data-theme="day"] .kc-mastery-row span {
  color: #25324a;
}
html[data-theme="day"] .kc-bar,
html[data-theme="day"] .progress-line {
  background: #dde5f1;
}
html[data-theme="day"] .student-progress-card {
  background: #ffffff;
  border-color: #d9e1ef;
  box-shadow: 0 10px 26px rgba(24,36,64,.08);
}
html[data-theme="day"] .student-progress-head strong {
  color: #172033;
}
html[data-theme="day"] .student-progress-head .muted {
  color: #56627a;
}
html[data-theme="day"] .student-progress-head > span {
  color: #5f4fe3;
}
html[data-theme="day"] .student-progress-meta,
html[data-theme="day"] .student-progress-card .muted {
  color: #56627a;
}
html[data-theme="day"] .student-progress-meta span {
  color: #56627a;
}
html[data-theme="day"] .teacher-next-step {
  background: rgba(22,143,117,.08);
  border-color: rgba(22,143,117,.22);
}
html[data-theme="day"] .teacher-next-step p {
  color: #42506a;
}
html[data-theme="day"] .modal-bg {
  background: rgba(22,32,51,.32);
}
@media (prefers-reduced-motion: reduce) {
  .classroom-tab,
  .review-icon,
  .review-filter,
  .group-card,
  .group-symbol,
  .student-table-card,
  .kc-summary-card,
  .student-table-row,
  .student-table-row i,
  .kc-mastery-row,
  .kc-bar i,
  .teacher-next-step,
  .student-progress-card {
    transition: none;
  }
  .kc-bar i::after,
  .progress-line span::after {
    animation: none;
  }
  .classroom-tab:hover,
  .review-head:hover .review-icon,
  .review-filter:hover,
  .group-card:hover,
  .group-card.active,
  .group-card:hover .group-symbol,
  .group-card.active .group-symbol,
  .student-table-card:hover,
  .kc-summary-card:hover,
  .student-table-row:not(.head):hover,
  .student-table-row:not(.head):hover i,
  .kc-mastery-row:hover,
  .teacher-next-step:hover,
  .student-progress-card:hover {
    transform: none;
  }
}
@media (max-width: 980px) {
  .topbar {
    grid-template-columns: 1fr;
    height: auto;
    min-height: 0;
    align-items: stretch;
    gap: 12px;
    padding: 10px 14px;
  }
  .brand-row,
  .top-nav,
  .top-actions {
    width: 100%;
  }
  .top-nav {
    justify-self: stretch;
    justify-content: stretch;
  }
  .top-nav-button {
    flex: 1 1 0;
    min-width: 0;
  }
  .top-actions {
    align-items: stretch;
    justify-content: flex-start;
    flex-wrap: wrap;
  }
  .top-status {
    flex: 1 1 100%;
    flex-wrap: wrap;
  }
  .top-nav {
    flex: 1 1 auto;
  }
  .account-button {
    flex: 1 1 180px;
    max-width: none;
  }
  .account-menu {
    left: 0;
    right: auto;
    width: 100%;
  }
  .classroom-create {
    grid-template-columns: 1fr;
  }
  .classroom-hero,
  .workspace-banner {
    flex-direction: column;
    align-items: stretch;
  }
  .workspace-title-row {
    align-items: flex-start;
    flex-direction: column;
  }
  .workspace-actions {
    justify-content: flex-start;
  }
  .classroom-subnav {
    width: 100%;
    overflow-x: auto;
  }
  .classroom-tab {
    flex: 1 0 180px;
  }
  .layout.with-classroom-banner {
    height: auto;
    min-height: calc(100vh - 140px);
  }
  .review-filters,
  .group-card-row,
  .review-grid {
    grid-template-columns: 1fr;
  }
  .personalized-practice {
    grid-template-columns: 1fr;
  }
  .practice-sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }
  .practice-preview-card {
    grid-template-columns: 36px minmax(0, 1fr);
  }
  .practice-preview-actions {
    grid-column: 2;
    justify-content: flex-start;
    flex-wrap: wrap;
  }
  .practice-preview-expanded {
    grid-template-columns: 1fr;
  }
  .practice-footer-actions,
  .practice-linked-kcs,
  .practice-run-head,
  .practice-hero {
    align-items: stretch;
    flex-direction: column;
  }
  .ai-pill {
    margin-left: 0;
    width: fit-content;
  }
  .student-table {
    overflow-x: auto;
  }
  .student-table-row {
    min-width: 900px;
  }
  .skill-tree-entry {
    top: 12px;
    right: 14px;
  }
  .auth-panel {
    grid-template-columns: 1fr;
    min-height: 0;
  }
  .entry-hero {
    padding: 34px;
  }
  .entry-hero::after {
    display: none;
  }
  .auth-card {
    border-left: 0;
    border-top: 1px solid var(--border);
  }
  .layout, .detail-body, .item-bank { grid-template-columns: 1fr; }
  .right { display: none; }
  .left { max-height: 45vh; }
  .canvas { min-height: 55vh; }
  .item-bank-filters { border-right: 0; border-bottom: 1px solid var(--border); }
}

@media (max-width: 720px) {
  .entry-shell { padding: 72px 14px 18px; }
  .classroom-shell { padding: 18px 14px; }
  .classroom-toast {
    top: 76px;
    right: 16px;
    left: 16px;
    justify-content: center;
  }
  .classroom-hero h1 { font-size: clamp(38px, 14vw, 54px); }
  .classroom-list-head {
    align-items: flex-start;
    flex-direction: column;
  }
  .classroom-card-top { flex-direction: column; }
  .classroom-invite-panel {
    align-items: flex-start;
    justify-content: flex-start;
    flex-wrap: wrap;
    width: 100%;
    min-width: 0;
  }
  .class-code-button { max-width: 100%; }
  .classroom-menu-popover {
    left: 0;
    right: auto;
  }
  .workspace-banner {
    align-items: flex-start;
    flex-direction: column;
  }
  .workspace-breadcrumb {
    flex-wrap: wrap;
  }
  .workspace-actions {
    width: 100%;
    justify-content: flex-start;
  }
  .review-dashboard { padding: 0 12px; }
  .classroom-subnav {
    justify-content: stretch;
    flex-direction: column;
  }
  .classroom-tab {
    width: 100%;
  }
  .review-head { align-items: flex-start; }
  .review-head h2 { font-size: 28px; }
  .entry-panel { border-radius: 16px; }
  .entry-hero, .auth-card { padding: 24px; }
  .entry-panel h1 {
    margin-top: 30px;
    font-size: clamp(38px, 14vw, 54px);
  }
  .entry-lede { font-size: 15px; }
  .auth-switch {
    width: 100%;
  }
  .auth-switch .chip {
    flex: 1;
    min-width: 0;
  }
  .entry-grid { grid-template-columns: 1fr; }
}