/* preplystats dashboard - dark, dependency-free.
   Charts are hand-rolled SVG (see app.js): no CDN, no bundler, no offline gap. */

:root {
  --bg:        #0d1117;
  --bg-2:      #131a24;
  --panel:     #161d29;
  --panel-2:   #1c2534;
  --border:    #26303f;
  --border-2:  #33415a;
  --text:      #e4e9f2;
  --text-dim:  #94a3b8;
  --text-mute: #64748b;

  /* Categorical series palette - distinguishable in dark, colourblind-aware */
  --c1: #4f9df7;   /* blue    */
  --c2: #2dd4a7;   /* teal    */
  --c3: #f7b955;   /* amber   */
  --c4: #c084fc;   /* violet  */
  --c5: #f472b6;   /* pink    */
  --c6: #60d394;   /* green   */
  --c7: #fb7185;   /* rose    */
  --c8: #38bdf8;   /* sky     */

  --ok:   #2dd4a7;
  --warn: #f7b955;
  --bad:  #fb7185;

  --radius: 10px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Inter,
          "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--c1); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------------------------------------------------------------- header */
header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13,17,23,.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.head-row {
  display: flex; align-items: center; gap: 14px;
  padding: 10px 20px; max-width: 1600px; margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 9px; font-weight: 650; font-size: 15px; }
.brand svg { width: 22px; height: 22px; }
.brand .dot { color: var(--c2); }
.pill {
  font-family: var(--mono); font-size: 11px; padding: 2px 8px;
  border: 1px solid var(--border-2); border-radius: 20px; color: var(--text-dim);
  cursor: pointer; background: var(--panel);
}
.pill:hover { border-color: var(--c1); color: var(--text); }
.pill.live  { border-color: var(--ok); color: var(--ok); }
.pill.down  { border-color: var(--bad); color: var(--bad); }
.spacer { flex: 1; }
.head-meta { font-size: 12px; color: var(--text-mute); font-family: var(--mono); }

nav {
  display: flex; gap: 2px; padding: 0 20px; max-width: 1600px; margin: 0 auto;
  overflow-x: auto; scrollbar-width: none;
}
nav::-webkit-scrollbar { display: none; }
nav button {
  background: none; border: none; border-bottom: 2px solid transparent;
  color: var(--text-dim); padding: 9px 14px; font-size: 13px; cursor: pointer;
  white-space: nowrap; font-family: inherit;
}
nav button:hover { color: var(--text); }
nav button.active { color: var(--c1); border-bottom-color: var(--c1); font-weight: 600; }

/* ----------------------------------------------------------------- layout */
main { max-width: 1600px; margin: 0 auto; padding: 18px 20px 60px; }
.view { display: none; }
.view.active { display: block; animation: fade .18s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(3px); } to { opacity: 1; } }

.grid { display: grid; gap: 14px; }
.g2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
@media (max-width: 1100px) { .g3, .g4 { grid-template-columns: repeat(2, minmax(0,1fr)); } }
@media (max-width: 720px)  { .g2, .g3, .g4 { grid-template-columns: 1fr; } }

.card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 16px;
}
.card h3 {
  margin: 0 0 2px; font-size: 13px; font-weight: 600; color: var(--text);
  display: flex; align-items: center; gap: 8px;
}
.card .sub { font-size: 11.5px; color: var(--text-mute); margin-bottom: 10px; }

/* ------------------------------------------------------------------ tiles */
.tile { background: var(--panel); border: 1px solid var(--border);
        border-radius: var(--radius); padding: 13px 15px; }
.tile .label {
  font-size: 11px; text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-mute); font-weight: 600;
}
.tile .value {
  font-size: 25px; font-weight: 680; margin-top: 5px;
  font-variant-numeric: tabular-nums; line-height: 1.15;
}
.tile .value.sm { font-size: 19px; }
.tile .foot { font-size: 11.5px; color: var(--text-dim); margin-top: 3px; }
.tile.ok  .value { color: var(--ok); }
.tile.bad .value { color: var(--bad); }
.tile.warn .value { color: var(--warn); }

/* ------------------------------------------------------------------ table */
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th {
  text-align: left; font-size: 11px; text-transform: uppercase;
  letter-spacing: .05em; color: var(--text-mute); font-weight: 600;
  padding: 7px 9px; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: var(--panel);
}
th.sortable { cursor: pointer; user-select: none; }
th.sortable:hover { color: var(--c1); }
td { padding: 7px 9px; border-bottom: 1px solid var(--bg-2); vertical-align: middle; }
tbody tr:hover { background: var(--panel-2); }
.num { text-align: right; font-variant-numeric: tabular-nums; font-family: var(--mono);
       font-size: 12.5px; }
.table-wrap { overflow-x: auto; max-height: 620px; overflow-y: auto; }

/* ------------------------------------------------------------------- misc */
.badge {
  display: inline-block; font-size: 10.5px; padding: 1.5px 6px; border-radius: 4px;
  border: 1px solid var(--border-2); color: var(--text-dim); font-weight: 600;
  white-space: nowrap;
}
.badge.super { border-color: var(--c3); color: var(--c3); }
.badge.pro   { border-color: var(--c4); color: var(--c4); }
.badge.ok    { border-color: var(--ok);  color: var(--ok); }
.badge.bad   { border-color: var(--bad); color: var(--bad); }
.badge.dim   { border-color: var(--border); color: var(--text-mute); }

.avatar { width: 30px; height: 30px; border-radius: 50%; object-fit: cover;
          background: var(--panel-2); flex-shrink: 0; }
.tutor-cell { display: flex; align-items: center; gap: 9px; min-width: 190px; }
.tutor-cell .nm { font-weight: 600; font-size: 13px; }
.tutor-cell .hl { font-size: 11px; color: var(--text-mute);
                  max-width: 320px; overflow: hidden; text-overflow: ellipsis;
                  white-space: nowrap; }
.flag { width: 15px; height: 11px; border-radius: 2px; vertical-align: -1px; }

button.btn {
  background: var(--panel-2); border: 1px solid var(--border-2); color: var(--text);
  padding: 6px 12px; border-radius: 6px; font-size: 12.5px; cursor: pointer;
  font-family: inherit;
}
button.btn:hover { border-color: var(--c1); color: var(--c1); }
button.btn.primary { background: var(--c1); border-color: var(--c1); color: #06121f;
                     font-weight: 650; }
button.btn.primary:hover { background: #6aabf8; color: #06121f; }
button.btn.danger:hover { border-color: var(--bad); color: var(--bad); }
button.btn:disabled { opacity: .5; cursor: not-allowed; }
button.btn.sm { padding: 3px 8px; font-size: 11.5px; }

input, select {
  background: var(--bg-2); border: 1px solid var(--border-2); color: var(--text);
  padding: 7px 10px; border-radius: 6px; font-size: 13px; font-family: inherit;
}
input:focus, select:focus { outline: none; border-color: var(--c1); }
input::placeholder { color: var(--text-mute); }
label.fld { display: flex; flex-direction: column; gap: 4px; font-size: 11.5px;
            color: var(--text-dim); }

.row { display: flex; gap: 9px; align-items: center; flex-wrap: wrap; }
.muted { color: var(--text-mute); }
.dim   { color: var(--text-dim); }
.mono  { font-family: var(--mono); }
.right { text-align: right; }
.nowrap { white-space: nowrap; }

.note {
  background: var(--bg-2); border-left: 3px solid var(--c3);
  padding: 9px 12px; border-radius: 0 6px 6px 0; font-size: 12.5px;
  color: var(--text-dim); margin: 10px 0;
}
.note.info { border-left-color: var(--c1); }
.note.bad  { border-left-color: var(--bad); }

.empty { padding: 34px; text-align: center; color: var(--text-mute); font-size: 13px; }
.spin { display: inline-block; width: 12px; height: 12px; border: 2px solid var(--border-2);
        border-top-color: var(--c1); border-radius: 50%; animation: sp .7s linear infinite; }
@keyframes sp { to { transform: rotate(360deg); } }

/* ----------------------------------------------------------------- charts */
.chart { width: 100%; display: block; overflow: visible; }
.chart .axis    { stroke: var(--border); stroke-width: 1; }
.chart .grid-l  { stroke: var(--border); stroke-width: 1; stroke-dasharray: 2 4; opacity: .55; }
.chart text     { fill: var(--text-mute); font-size: 10px; font-family: var(--sans); }
.chart .lbl-v   { fill: var(--text-dim); font-size: 10px; }
.chart .area    { opacity: .13; }
.chart .ln      { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.chart .pt      { stroke: var(--panel); stroke-width: 1.5; }
.chart .bar:hover { opacity: .8; }
.legend { display: flex; gap: 14px; flex-wrap: wrap; font-size: 11.5px;
          color: var(--text-dim); margin-top: 8px; }
.legend i { width: 9px; height: 9px; border-radius: 2px; display: inline-block;
            margin-right: 5px; vertical-align: 0; }

.hbar-row { display: grid; grid-template-columns: 130px 1fr 74px; gap: 10px;
            align-items: center; padding: 3px 0; font-size: 12.5px; }
.hbar-track { background: var(--bg-2); border-radius: 3px; height: 15px; overflow: hidden; }
.hbar-fill  { height: 100%; border-radius: 3px; transition: width .3s ease; }
.hbar-row .v { text-align: right; font-family: var(--mono); font-size: 11.5px;
               color: var(--text-dim); }
.hbar-row .k { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ----------------------------------------------------------------- modal */
.modal-bg {
  position: fixed; inset: 0; background: rgba(3,7,12,.8); z-index: 100;
  display: flex; align-items: flex-start; justify-content: center; padding: 40px 16px;
  overflow-y: auto;
}
.modal {
  background: var(--panel); border: 1px solid var(--border-2);
  border-radius: 12px; max-width: 1060px; width: 100%; padding: 20px 22px;
}
.modal-head { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 14px; }
.modal-head .avatar { width: 52px; height: 52px; }
.modal h2 { margin: 0; font-size: 18px; }
.close-x { background: none; border: none; color: var(--text-mute); font-size: 22px;
           cursor: pointer; line-height: 1; padding: 0 4px; }
.close-x:hover { color: var(--text); }

/* --------------------------------------------------------------- roadmap */
.md h1 { font-size: 20px; margin: 4px 0 10px; }
.md h2 { font-size: 16px; margin: 22px 0 8px; padding-bottom: 5px;
         border-bottom: 1px solid var(--border); }
.md h3 { font-size: 13.5px; margin: 16px 0 5px; color: var(--c1); }
.md h4 { font-size: 12.5px; margin: 12px 0 4px; color: var(--text-dim); }
.md p  { margin: 7px 0; color: var(--text-dim); font-size: 13px; }
.md ul, .md ol { margin: 7px 0; padding-left: 22px; }
.md li { margin: 3px 0; color: var(--text-dim); font-size: 13px; }
.md code { background: var(--bg-2); padding: 1.5px 5px; border-radius: 4px;
           font-family: var(--mono); font-size: 12px; color: var(--c2); }
.md pre { background: var(--bg-2); padding: 11px 13px; border-radius: 7px;
          overflow-x: auto; font-family: var(--mono); font-size: 12px;
          color: var(--text-dim); border: 1px solid var(--border); }
.md hr { border: none; border-top: 1px solid var(--border); margin: 18px 0; }
.md table { margin: 10px 0; }
.md .box { color: var(--text-mute); }
.md .box.done { color: var(--ok); }
.md strong { color: var(--text); }

.tick { color: var(--ok); }  .cross { color: var(--bad); }
.up   { color: var(--ok); }  .down { color: var(--bad); }