/* ISB AI Tutor — Faculty Console.
   ISB brand system (Legacy Blue / Innovation Blue / Mint), Newsreader display
   serif over an Inter UI on a faint engineering-grid canvas. Every selector
   the console JS emits is preserved; only the skin changed. */

:root {
  --legacy: #192890;        /* Legacy Blue   */
  --innovation: #245bff;    /* Innovation Blue */
  --mint: #80edd9;          /* Secondary     */
  --mint-deep: #12947e;
  --mint-soft: #e1fff9;
  --ink: #2e3b42;
  --slate: #5d6f7a;
  --steel: #95a9b4;
  --mist: #e6ebee;
  --cloud: #f4f8fa;
  --white: #fff;
  --legacy-soft: #e7eafc;
  --inno-soft: #e9eeff;
  --grid: rgba(149, 169, 180, .16);
  --line: #e6ebee;
  --line-2: #eef2f5;
  --amber: #b07d2b;
  --amber-wash: #fbf2df;
  --rust: #b3402f;
  --rust-wash: #fce8e4;

  --r: 14px;
  --shadow: 0 1px 2px rgba(25, 40, 144, .04), 0 14px 34px -20px rgba(25, 40, 144, .26);
  --shadow-lg: 0 30px 70px -30px rgba(25, 40, 144, .45);

  /* legacy aliases kept so any stray rule still resolves */
  --paper: var(--cloud);
  --surface: var(--white);
  --ink-soft: var(--slate);
  --hairline: var(--line);
  --petrol: var(--innovation);
  --petrol-deep: var(--legacy);
  --petrol-wash: var(--inno-soft);
  --moss: var(--mint-deep);
  --moss-wash: var(--mint-soft);

  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --serif: "Newsreader", Georgia, "Iowan Old Style", Palatino, serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: var(--sans); color: var(--ink); font-size: 14px;
  -webkit-font-smoothing: antialiased; line-height: 1.5;
  background:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px),
    var(--cloud);
  background-size: 38px 38px, 38px 38px, auto;
}

#app { display: flex; min-height: 100vh; }

/* --- sidebar ------------------------------------------------------------ */
#sidebar {
  width: 236px; flex-shrink: 0; display: flex; flex-direction: column;
  background: rgba(255, 255, 255, .66); backdrop-filter: blur(8px);
  border-right: 1px solid var(--line); color: var(--slate); padding: 18px 0;
  position: sticky; top: 0; height: 100vh;
}
.brand { display: flex; gap: 11px; align-items: center; padding: 2px 18px 16px; }
.brand-mark {
  font-family: var(--serif); font-weight: 600; font-size: 15px;
  background: var(--legacy); color: #fff;
  width: 38px; height: 38px; border-radius: 50%;
  display: grid; place-items: center; letter-spacing: .3px; flex: none;
}
.brand-title { font-family: var(--serif); font-size: 17px; color: var(--legacy); font-weight: 600; letter-spacing: -.01em; }
.brand-sub { font-size: 10.5px; opacity: .9; color: var(--steel); letter-spacing: .13em; text-transform: uppercase; font-weight: 700; }
.context-chip {
  margin: 0 14px 14px; padding: 9px 11px; border-radius: 10px;
  background: var(--legacy-soft); color: var(--legacy);
  font-family: var(--mono); font-size: 11px; line-height: 1.5; word-break: break-all;
}
#nav { display: flex; flex-direction: column; padding: 6px 12px; gap: 3px; }
#nav a {
  color: var(--slate); text-decoration: none; padding: 9px 12px; border-radius: 10px;
  font-size: 13.5px; font-weight: 600; display: flex; justify-content: space-between;
  align-items: center; transition: .14s;
}
#nav a:hover { background: var(--cloud); color: var(--ink); }
#nav a.active { background: var(--legacy); color: #fff; }
.badge-count {
  background: var(--mint); color: var(--legacy); border-radius: 9px;
  font-size: 10px; padding: 1px 7px; font-weight: 800; font-family: var(--mono);
}
.sidebar-foot { margin-top: auto; padding: 14px 22px 4px; font-size: 12px; display: flex; flex-direction: column; gap: 7px; }
.sidebar-foot a { color: var(--steel); text-decoration: none; }
.linklike { background: none; border: none; color: var(--steel); text-align: left; padding: 0; font: inherit; font-size: 12px; cursor: pointer; }
.linklike:hover, .sidebar-foot a:hover { color: var(--innovation); }

/* --- main --------------------------------------------------------------- */
#main { flex: 1; padding: 30px 40px 80px; max-width: 1100px; }
h1 { font-family: var(--serif); font-size: 30px; line-height: 1.08; margin: 0 0 6px; font-weight: 600; color: var(--legacy); letter-spacing: -.012em; }
h2 { font-family: var(--serif); font-size: 19px; margin: 28px 0 10px; font-weight: 600; color: var(--legacy); letter-spacing: -.01em; }
.view-sub { color: var(--slate); margin: 0 0 24px; max-width: 68ch; font-size: 14px; }

.card {
  background: var(--white); border: 1px solid var(--line);
  border-radius: var(--r); padding: 18px 20px; margin-bottom: 16px;
  box-shadow: var(--shadow);
}
.card h3 { margin: 0 0 9px; font-size: 14.5px; font-family: var(--serif); color: var(--legacy); font-weight: 600; }
.row { display: flex; gap: 16px; flex-wrap: wrap; align-items: flex-start; }
.row > .card { flex: 1; min-width: 300px; }
.muted { color: var(--slate); }
.small { font-size: 12.5px; }
.mono { font-family: var(--mono); font-size: 12px; }
.hidden { display: none !important; }

/* --- chips & badges ------------------------------------------------------ */
.chip {
  display: inline-block; border-radius: 999px; padding: 3px 11px;
  font-size: 11.5px; font-weight: 600; letter-spacing: .02em;
  background: var(--cloud); color: var(--slate); border: 1px solid var(--line);
}
.chip.amber { background: var(--amber-wash); color: var(--amber); border-color: #ecd9ad; }
.chip.rust  { background: var(--rust-wash); color: var(--rust); border-color: #eebcb3; }
.chip.moss  { background: var(--mint-soft); color: var(--mint-deep); border-color: #bdeee2; }
.chip.gray  { background: var(--cloud); color: var(--steel); border-color: var(--line); }
.state-DRAFT     { background: var(--amber-wash); color: var(--amber); border-color: #ecd9ad; }
.state-PUBLISHED { background: var(--mint-soft); color: var(--mint-deep); border-color: #bdeee2; }
.state-RETIRED   { background: var(--cloud); color: var(--steel); border-color: var(--line); }

/* --- buttons & forms ------------------------------------------------------ */
button.btn {
  font: inherit; font-size: 13px; font-weight: 700; cursor: pointer;
  border-radius: 11px; padding: 9px 16px; border: 1px solid transparent;
  transition: .15s;
}
.btn.primary { background: var(--innovation); color: #fff; box-shadow: 0 10px 20px -10px var(--innovation); }
.btn.primary:hover { background: var(--legacy); }
.btn.ghost { background: #fff; border-color: var(--line); color: var(--slate); }
.btn.ghost:hover { border-color: var(--innovation); color: var(--innovation); background: var(--inno-soft); }
.btn.danger { background: #fff; border-color: var(--rust); color: var(--rust); }
.btn.danger:hover { background: var(--rust); color: #fff; }
.btn:disabled { opacity: .5; cursor: not-allowed; box-shadow: none; }
.btn .spin { display: inline-block; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

label.field { display: block; margin: 12px 0; font-size: 12.5px; color: var(--slate); }
label.field > span { display: block; margin-bottom: 5px; font-weight: 600; letter-spacing: .02em; color: var(--ink); }
input[type=text], textarea, select {
  font: inherit; font-size: 13px; width: 100%; padding: 9px 12px;
  border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--ink);
}
textarea { min-height: 88px; resize: vertical; }
textarea.tall { min-height: 170px; }
input:focus, textarea:focus, select:focus { outline: none; border-color: var(--innovation); box-shadow: 0 0 0 4px var(--inno-soft); }

/* --- tables ---------------------------------------------------------------- */
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th { text-align: left; font-size: 11px; text-transform: uppercase; letter-spacing: .05em;
     color: var(--steel); font-weight: 700; padding: 7px 10px; border-bottom: 1px solid var(--line); }
td { padding: 9px 10px; border-bottom: 1px solid var(--line-2); vertical-align: top; }
tr:last-child td { border-bottom: none; }

/* --- specialty blocks -------------------------------------------------------- */
.fidelity-pill {
  font-family: var(--mono); font-weight: 700; border-radius: 8px; padding: 3px 9px;
}
.fidelity-pill.pass { background: var(--mint-soft); color: var(--mint-deep); }
.fidelity-pill.fail { background: var(--rust-wash); color: var(--rust); }

.diff { font-family: var(--mono); font-size: 12px; line-height: 1.55;
        background: #fbfdff; border: 1px solid var(--line); border-radius: 10px;
        padding: 12px; overflow-x: auto; white-space: pre; max-height: 460px; overflow-y: auto; }
.diff .add { background: #e1fbf2; color: #0f6b54; display: block; }
.diff .del { background: var(--rust-wash); color: #84231c; display: block; }
.diff .hunk { color: var(--innovation); display: block; }
.diff .file { font-weight: 700; color: var(--legacy); display: block; margin-top: 6px; }

.prevalence { height: 8px; background: var(--mist); border-radius: 6px; overflow: hidden; }
.prevalence > div { height: 100%; background: var(--innovation); border-radius: 6px; }

.transcript { border-left: 3px solid var(--mint); padding: 4px 13px; margin: 8px 0; }
.turn { margin: 6px 0; }
.turn .who { font-weight: 700; font-size: 11px; text-transform: uppercase; letter-spacing: .05em; }
.turn.student .who { color: var(--innovation); }
.turn.tutor .who { color: var(--legacy); }

.bench-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.bench-side { background: #fbfdff; border: 1px solid var(--line); border-radius: 12px; padding: 11px 13px; font-size: 13px; }
.bench-side h4 { margin: 0 0 6px; font-size: 12px; color: var(--legacy); }

.kc-node { cursor: default; }
.kc-node rect { fill: var(--white); stroke: var(--innovation); rx: 6; }
.kc-node text { font-family: var(--mono); font-size: 10.5px; fill: var(--ink); }
.kc-edge { stroke: #b9c9c4; stroke-width: 1.2; fill: none; marker-end: url(#arrow); }
.dag-wrap { overflow-x: auto; }

details.kc-page { border: 1px solid var(--line); border-radius: 10px; margin: 8px 0; background: var(--white); }
details.kc-page summary { cursor: pointer; padding: 11px 14px; font-weight: 600; color: var(--legacy); }
details.kc-page .kc-body { padding: 0 14px 12px; }
.tier { margin: 8px 0; }
.tier .tier-label { font-size: 10.5px; text-transform: uppercase; letter-spacing: .08em;
                    color: var(--steel); font-weight: 700; }
.excerpt { border-left: 3px solid var(--mint); background: var(--mint-soft);
           padding: 8px 11px; border-radius: 0 8px 8px 0; margin: 6px 0; font-size: 12.5px; color: var(--mint-deep); }

.notif { display: flex; gap: 12px; align-items: center; padding: 12px 14px;
         border: 1px solid var(--line); border-radius: 11px; margin-bottom: 8px;
         background: var(--white); cursor: pointer; box-shadow: var(--shadow); }
.notif.unread { border-left: 4px solid var(--mint); }
.notif:hover { border-color: var(--innovation); }
.notif .kind { font-weight: 700; font-size: 12px; color: var(--legacy); }

.banner { border-radius: 11px; padding: 11px 14px; margin: 10px 0; font-size: 13px; }
.banner.amber { background: var(--amber-wash); border: 1px solid #ecd9ad; color: var(--amber); }
.banner.moss  { background: var(--mint-soft); border: 1px solid #bdeee2; color: var(--mint-deep); }
.banner.rust  { background: var(--rust-wash); border: 1px solid #eebcb3; color: var(--rust); }

.gate-note { font-size: 12px; color: var(--slate); margin-top: 6px; }
.empty { color: var(--steel); font-style: italic; padding: 14px 0; }

.sandbox { border: 1.5px dashed var(--mint-deep); border-radius: 12px; padding: 14px 16px;
           background: #f4fffc; }
.sandbox .sandbox-tag { font-size: 11px; font-weight: 700; letter-spacing: .07em;
                        text-transform: uppercase; color: var(--mint-deep); }

/* --- connect screen ----------------------------------------------------------- */
.connect-wrap { max-width: 440px; margin: 9vh auto 0; }
.connect-wrap .card { box-shadow: var(--shadow-lg); }
.connect-wrap .brand-mark { display: inline-grid; margin-bottom: 16px; }

/* --- toasts --------------------------------------------------------------------- */
#toasts { position: fixed; bottom: 24px; right: 24px; display: flex;
          flex-direction: column; gap: 8px; z-index: 50; max-width: 420px; }
.toast { background: var(--legacy); color: #f3f6ff; border-radius: 12px; padding: 12px 16px;
         font-size: 13px; font-weight: 600; box-shadow: var(--shadow-lg); }
.toast.error { background: var(--rust); }
.toast.ok { background: var(--mint-deep); }