/* MarkPapers — dark theme design system */
:root {
  --bg: #0f0f13;
  --surface: #17171e;
  --surface-2: #1e1e27;
  --border: #26262f;
  --border-strong: #33333f;
  --ink: #e8e8ee;
  --ink-2: #9a9aa5;
  --ink-3: #6b6b76;
  --accent: #a78bfa;
  --accent-strong: #8b5cf6;
  --chart: #9678f2;      /* validated series color on --surface */
  --good: #34d399;
  --warn: #fbbf24;
  --bad: #f87171;
  --radius: 10px;
}

* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.55 -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 24px; margin: 0 0 4px; }
h2 { font-size: 17px; margin: 0 0 12px; }
h3 { font-size: 15px; margin: 0 0 8px; }

/* ---- shell ---- */
.shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 210px; flex-shrink: 0; padding: 20px 14px; border-right: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 4px; position: sticky; top: 0; height: 100vh;
}
.brand { font-weight: 700; font-size: 17px; padding: 4px 10px 16px; color: var(--ink); }
.brand .tick { color: var(--accent); margin-right: 6px; }
.sidebar a.nav {
  padding: 8px 10px; border-radius: 8px; color: var(--ink-2); display: block;
}
.sidebar a.nav:hover { color: var(--ink); background: var(--surface); text-decoration: none; }
.sidebar a.nav.active { background: var(--accent-strong); color: #fff; }
.sidebar .spacer { flex: 1; }
.userchip { border-top: 1px solid var(--border); padding: 12px 10px 0; font-size: 13px; color: var(--ink-2); }
.userchip .name { color: var(--ink); display: block; }
.main { flex: 1; padding: 28px 34px; max-width: 1180px; min-width: 0; }

/* ---- auth pages ---- */
.auth-wrap { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.auth-card {
  width: 100%; max-width: 400px; background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 30px 28px;
}
.auth-card .logo { text-align: center; font-size: 20px; font-weight: 700; margin-bottom: 2px; }
.auth-card .tagline { text-align: center; color: var(--ink-3); font-size: 13px; margin-bottom: 22px; }
.auth-links { display: flex; justify-content: space-between; margin-top: 14px; font-size: 13px; }
.divider { display: flex; align-items: center; gap: 10px; color: var(--ink-3); font-size: 12px; margin: 14px 0; }
.divider::before, .divider::after { content: ""; flex: 1; border-top: 1px solid var(--border); }

/* ---- forms ---- */
label { display: block; font-size: 13px; color: var(--ink-2); margin: 12px 0 4px; }
input[type=text], input[type=email], input[type=password], input[type=number], select, textarea {
  width: 100%; background: var(--bg); color: var(--ink); border: 1px solid var(--border-strong);
  border-radius: 8px; padding: 9px 11px; font: inherit;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent-strong); border-color: transparent; }
.btn {
  display: inline-block; background: var(--accent-strong); color: #fff; border: 0; cursor: pointer;
  border-radius: 8px; padding: 9px 16px; font: inherit; font-weight: 600;
}
.btn:hover { filter: brightness(1.1); text-decoration: none; }
.btn.full { width: 100%; margin-top: 16px; }
.btn.ghost { background: transparent; border: 1px solid var(--border-strong); color: var(--ink); }
.btn.small { padding: 5px 10px; font-size: 13px; }
.btn.danger { background: #7f1d1d; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }

/* ---- cards, tables ---- */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 22px; margin-bottom: 18px; }
.card-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.muted { color: var(--ink-2); font-size: 13px; }
.tiny { color: var(--ink-3); font-size: 12px; }
table.list { width: 100%; border-collapse: collapse; margin-top: 10px; }
table.list th { text-align: left; font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); padding: 6px 10px; border-bottom: 1px solid var(--border); }
table.list td { padding: 9px 10px; border-bottom: 1px solid var(--border); }
table.list tr:last-child td { border-bottom: 0; }
table.list tbody tr:hover td { background: var(--surface-2); }

/* ---- badges & status ---- */
.badge { display: inline-block; font-size: 12px; font-weight: 600; padding: 2px 10px; border-radius: 999px; white-space: nowrap; }
.badge.ok    { background: rgba(52,211,153,.12); color: var(--good); }
.badge.warn  { background: rgba(251,191,36,.12); color: var(--warn); }
.badge.bad   { background: rgba(248,113,113,.12); color: var(--bad); }
.badge.plain { background: var(--surface-2); color: var(--ink-2); }
.badge.accent{ background: rgba(139,92,246,.16); color: var(--accent); }

/* grade circle */
.grade {
  display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 50%;
  border: 2px solid var(--accent); color: var(--ink); font-weight: 700; font-size: 13px;
}
.grade.low { border-color: var(--warn); }
.grade.u   { border-color: var(--bad); }

/* score bar */
.scorebar { background: var(--surface-2); border-radius: 999px; height: 8px; min-width: 120px; overflow: hidden; }
.scorebar > span { display: block; height: 100%; background: var(--chart); border-radius: 999px; }

/* ---- stat tiles ---- */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 14px; margin-bottom: 18px; }
.tile { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; }
.tile .value { font-size: 26px; font-weight: 700; letter-spacing: -0.02em; }
.tile .label { font-size: 11px; text-transform: uppercase; letter-spacing: .07em; color: var(--ink-3); margin-top: 2px; }

/* ---- charts ---- */
.chart-card svg { display: block; width: 100%; height: auto; }
.chart-card text { font-family: inherit; }
details.data-table { margin-top: 10px; }
details.data-table summary { color: var(--ink-3); font-size: 12px; cursor: pointer; }

/* ---- upload wizard ---- */
.steps { display: flex; gap: 8px; align-items: center; color: var(--ink-3); font-size: 13px; margin-bottom: 20px; flex-wrap: wrap; }
.steps .step { padding: 4px 12px; border-radius: 999px; border: 1px solid var(--border-strong); }
.steps .step.on { background: var(--accent-strong); color: #fff; border-color: transparent; }
.dropzone {
  border: 2px dashed var(--border-strong); border-radius: var(--radius); padding: 44px 20px;
  text-align: center; color: var(--ink-2); background: var(--surface); cursor: pointer;
}
.dropzone.dragover { border-color: var(--accent); background: var(--surface-2); }
.queue-item { display: flex; align-items: center; gap: 10px; padding: 8px 4px; border-bottom: 1px solid var(--border); }
.queue-item input { max-width: 220px; }

/* ---- marking review ---- */
.review { display: grid; grid-template-columns: minmax(0, 1fr) 430px; gap: 18px; align-items: start; }
.pdfpane { position: sticky; top: 16px; }
.pdfpane iframe { width: 100%; height: calc(100vh - 120px); border: 1px solid var(--border); border-radius: var(--radius); background: #fff; }
.qrow { border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 10px; background: var(--surface); }
.qrow .qhead {
  display: flex; width: 100%; justify-content: space-between; align-items: center; gap: 8px;
  padding: 11px 14px; cursor: pointer; color: var(--ink); list-style: none;
}
.qrow .qhead::-webkit-details-marker { display: none; }
.qrow .qhead:hover { background: var(--surface-2); }
.qrow .qbody { padding: 0 14px 14px; border-top: 1px solid var(--border); }
.ai-comment { background: rgba(139,92,246,.08); border: 1px solid rgba(139,92,246,.25); border-radius: 8px; padding: 10px 12px; font-size: 13px; margin: 10px 0; }
.override { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.override input[type=number] { width: 74px; }
.flag { color: var(--warn); }

/* ---- pricing ---- */
.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.plan { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 24px; display: flex; flex-direction: column; }
.plan.current { border-color: var(--accent-strong); box-shadow: 0 0 0 1px var(--accent-strong); }
.plan .price { font-size: 30px; font-weight: 700; }
.plan .price small { font-size: 14px; color: var(--ink-3); font-weight: 400; }
.plan ul { list-style: none; padding: 0; margin: 14px 0; flex: 1; }
.plan li { padding: 4px 0; color: var(--ink-2); font-size: 14px; }
.plan li::before { content: "✓ "; color: var(--good); }
.plan li.no::before { content: "✗ "; color: var(--ink-3); }

/* usage meter */
.meter { background: var(--surface-2); border-radius: 999px; height: 10px; overflow: hidden; margin-top: 6px; }
.meter > span { display: block; height: 100%; background: var(--accent-strong); }
.meter.hot > span { background: var(--warn); }

/* flash */
.flash { border-radius: 8px; padding: 11px 14px; margin-bottom: 16px; font-size: 14px; }
.flash.notice { background: rgba(52,211,153,.1); border: 1px solid rgba(52,211,153,.3); color: var(--good); }
.flash.alert  { background: rgba(248,113,113,.1); border: 1px solid rgba(248,113,113,.3); color: var(--bad); }

.banner { background: rgba(251,191,36,.08); border: 1px solid rgba(251,191,36,.3); color: var(--warn); border-radius: 8px; padding: 10px 14px; font-size: 13px; margin-bottom: 16px; }

.google-btn { display: flex; align-items: center; justify-content: center; gap: 8px; width: 100%; background: #fff; color: #1f1f1f; border-radius: 8px; padding: 9px; font-weight: 600; border: 0; cursor: pointer; font: inherit; }

@media (max-width: 900px) {
  .shell { flex-direction: column; }
  .sidebar { width: auto; height: auto; position: static; flex-direction: row; flex-wrap: wrap; align-items: center; }
  .sidebar .spacer, .userchip { display: none; }
  .review { grid-template-columns: 1fr; }
  .pdfpane { position: static; }
  .pdfpane iframe { height: 60vh; }
}