:root {
  --bg: #f4f6fb;
  --card: #fff;
  --ink: #14213d;
  --muted: #667085;
  --line: #e3e8f0;
  --blue: #1649c5;
  --soft: #edf3ff;
  --ok: #147a52;
  --bad: #b42318;
  --warn: #986801;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--ink);
}
button, input, textarea, select { font: inherit; }
.shell {
  max-width: 960px;
  margin: auto;
  min-height: 100dvh;
  padding-bottom: calc(84px + env(safe-area-inset-bottom));
}
main {
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}
header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: #f4f6fbef;
  backdrop-filter: blur(10px);
  padding: calc(14px + env(safe-area-inset-top))
    calc(16px + env(safe-area-inset-right)) 14px
    calc(16px + env(safe-area-inset-left));
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
}
header h1 { font-size: 21px; margin: 1px 0; }
.user {
  font-size: 12px; background: #eaf0ff; color: #2447a9; padding: 6px 10px;
  border-radius: 99px; height: max-content;
}
.card,.hero {
  background: var(--card); margin: 12px 14px; padding: 16px; border-radius: 18px;
  border: 1px solid var(--line);
}
.hero { background: linear-gradient(145deg, #102d72, #2458d5); color: #fff; border: 0; }
.hero h2 { margin: 4px 0; }
.row { display: flex; gap: 8px; flex-wrap: wrap; }
.grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.metrics { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px; }
.metric { background: #f8faff; border: 1px solid var(--line); border-radius: 13px; padding: 12px; }
.metric b { display: block; font-size: 20px; }
.muted { color: var(--muted); font-size: 13px; }
.view { display: none; }
.view.on { display: block; }
.hide { display: none !important; }
button {
  border: 1px solid #ccd6e8; background: #fff; color: #1e376c; padding: 10px 12px;
  border-radius: 12px; font-weight: 750; cursor: pointer;
}
button.primary,button.sel { background: var(--blue); color: #fff; border-color: var(--blue); }
button.wide { width: 100%; margin-top: 9px; }
.plan,.unit,.hist { padding: 11px 0; border-bottom: 1px solid var(--line); }
.tag { font-size: 10px; background: var(--soft); color: var(--blue); padding: 4px 7px; border-radius: 99px; }
.bar { height: 7px; background: #edf0f5; border-radius: 99px; overflow: hidden; }
.bar i { display: block; height: 100%; background: var(--blue); }
details { border-top: 1px solid var(--line); padding: 9px 0; }
summary { font-weight: 800; cursor: pointer; }
.opt { display: block; width: 100%; text-align: left; margin: 7px 0; }
.ok { color: var(--ok); font-weight: 800; }
.bad { color: var(--bad); font-weight: 800; }
textarea { width: 100%; min-height: 220px; padding: 11px; border: 1px solid var(--line); border-radius: 12px; }
.rub { display: grid; gap: 7px; margin: 10px 0; }
.rub label { display: flex; justify-content: space-between; gap: 10px; align-items: center; }
.studybox { background: #fafbff; border: 1px solid var(--line); border-radius: 13px; padding: 12px; margin: 10px 0; }
.studybox h3 { margin-top: 0; }
nav {
  position: fixed; bottom: 0; left: 50%; transform: translateX(-50%); width: min(960px,100%);
  display: grid; grid-template-columns: repeat(6,1fr); background: #fff; border-top: 1px solid var(--line);
  padding: 6px max(6px,env(safe-area-inset-right)) calc(6px + env(safe-area-inset-bottom)) max(6px,env(safe-area-inset-left)); z-index: 10;
}
nav button { border: 0; padding: 9px 2px; font-size: 10px; color: #76839a; }
nav button.on { color: var(--blue); background: #fff; }
.visual-sequence { margin: 16px 0 12px; }
.visual-frames { display: grid; grid-template-columns: repeat(auto-fit,minmax(58px,1fr)); gap: 6px; padding: 0; list-style: none; margin: 0; }
.visual-frames li { min-width: 0; border: 1px solid var(--line); border-radius: 10px; background: #fff; padding: 4px; display: flex; flex-direction: column; align-items: center; }
.visual-step { font-size: 11px; color: var(--muted); }
.visual-svg { display: block; width: 100%; max-width: 110px; height: auto; aspect-ratio: 1; background: #fff; border-radius: 6px; flex-shrink: 0; }
.visual-option { display: flex; align-items: center; gap: 10px; min-width: 0; }
.visual-option .visual-svg { width: 76px; max-width: 28%; flex-shrink: 0; }
.visual-key { font-weight: 800; flex-shrink: 0; }
.visual-option-text,.visual-fallback { overflow-wrap: anywhere; font-size: 13px; }
.visual-option-text { font-weight: 500; }
.visual-fallback { display: block; line-height: 1.4; }
.opt:focus-visible { outline: 3px solid var(--blue); outline-offset: 2px; }
.opt:disabled { opacity: .76; }
.feedback { margin: 12px 0; padding: 12px; border: 1px solid var(--line); border-radius: 14px; background: #fafbff; }
.feedback-status { font-weight: 850; margin-bottom: 8px; }
.feedback-compare { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px; }
.feedback-choice { min-width: 0; border: 1px solid var(--line); border-radius: 12px; background: #fff; padding: 9px; }
.feedback-choice.correct { border-color: #8ad2b5; background: #f5fffa; }
.feedback-choice.user-wrong { border-color: #efaaa5; background: #fff8f7; }
.feedback-choice-label { display: block; font-size: 12px; font-weight: 800; margin-bottom: 6px; }
.feedback-explanation { margin-top: 10px; line-height: 1.45; font-size: 14px; }
.feedback-rule { margin-top: 8px; padding: 8px 10px; border-left: 3px solid var(--blue); background: #edf3ff; border-radius: 6px; font-size: 13px; }
.numeric-table-wrap { margin: 14px 0; overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.numeric-table { width: 100%; border-collapse: collapse; min-width: 280px; font-size: 14px; }
.numeric-table th,.numeric-table td { padding: 9px 10px; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
.numeric-table th { background: #edf3ff; font-weight: 800; color: var(--blue); }
.numeric-table tbody tr:last-child td { border-bottom: 0; }
.doc-card { padding: 13px; border: 1px solid var(--line); border-radius: 14px; margin: 9px 0; background: #fff; }
.doc-card h3 { margin: 0 0 6px; }
.manual { line-height: 1.55; }
.manual h1 { font-size: 24px; }
.manual h2 { font-size: 19px; margin-top: 24px; }
.manual ul { padding-left: 22px; }
.road-module { border: 1px solid var(--line); border-radius: 14px; margin: 10px 0; padding: 11px; }
.road-meta { display: grid; grid-template-columns: repeat(2,1fr); gap: 6px; margin: 8px 0; }
.road-meta span { background: #f8faff; border-radius: 8px; padding: 7px; font-size: 12px; }
.close-note { font-size: 12px; color: var(--muted); margin-top: 7px; }
.warn { color: var(--warn); font-weight: 800; }
.source-assets { margin: 14px 0; display: grid; gap: 10px; }
.source-asset { border: 1px solid var(--line); border-radius: 12px; background: #fff; padding: 6px; overflow: hidden; }
.source-asset img { display: block; width: 100%; height: auto; max-height: 72vh; object-fit: contain; border-radius: 8px; }
.source-asset small { display: block; padding: 5px 4px; color: var(--muted); }
.source-option-figure { width: 96px; max-width: 34%; aspect-ratio: 1; border: 1px solid var(--line); border-radius: 8px; background-color: #fff; background-repeat: no-repeat; flex: 0 0 auto; }
.source-option-note { font-size: 11px; color: var(--muted); font-weight: 500; }
.visual-option.has-source-crop { align-items: center; }
.visual-option.has-source-crop .visual-option-text { display: block; font-size: 12px; font-weight: 500; overflow-wrap: anywhere; }
@media (max-width:520px) {
  .feedback-compare { grid-template-columns: 1fr; }
  .road-meta { grid-template-columns: 1fr; }
  nav button { font-size: 9px; padding: 9px 0; }
  .source-option-figure { width: 88px; max-width: 32%; }
}
@media (min-width:700px) {
  .metrics { grid-template-columns: repeat(4,1fr); }
  .grid { grid-template-columns: repeat(3,1fr); }
  .visual-frames { gap: 10px; }
  .visual-option .visual-svg { width: 90px; }
  .source-option-figure { width: 112px; }
}


/* v38 consolidated psychometric QA */
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}body{overscroll-behavior-y:none}button{min-height:44px;touch-action:manipulation}textarea{font-size:16px}
.reasoning-guide{margin:12px 0;border:1px solid #b9c9ef;border-radius:14px;background:#f7f9ff;padding:0}.reasoning-guide summary{padding:12px 14px;border:0;color:#173b96;font-weight:850;list-style-position:inside}.reasoning-guide-body{padding:0 14px 14px;line-height:1.5}.reasoning-guide-body h4{margin:4px 0 8px}.reasoning-guide-body ol{padding-left:22px}.reasoning-speed{background:#fff;border-left:3px solid var(--blue);padding:8px 10px;border-radius:6px}
.numeric-context-card{margin:14px 0;border:1px solid var(--line);border-radius:14px;background:#fff;padding:7px;overflow:hidden}.numeric-context-card small{display:block;padding:6px 4px 2px;color:var(--muted);font-size:12px}.numeric-context-single{display:block;width:100%;height:auto;max-height:42vh;object-fit:contain;border-radius:9px}.numeric-data-card{margin:14px 0;border:1px solid var(--line);border-radius:14px;background:#fff;overflow:hidden}.numeric-table-title{padding:10px 12px 8px;font-weight:750;font-size:14px;line-height:1.25;border-bottom:1px solid #eef1f6}.numeric-data-card .numeric-table-wrap{margin:0;border:0;border-radius:0}.numeric-table-notes{padding:8px 12px 10px;border-top:1px solid #eef1f6;color:var(--muted);font-size:12px;line-height:1.35}.numeric-table-notes>div+div{margin-top:4px}
.practice-session-head{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:8px 0 12px}.practice-session-head>div{display:flex;flex-direction:column;gap:2px}.question-stem{line-height:1.38;margin:14px 0 10px}.question-nav{position:sticky;bottom:calc(62px + env(safe-area-inset-bottom));z-index:9;display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:8px;margin:16px -4px 0;padding:10px;background:rgba(255,255,255,.96);backdrop-filter:blur(12px);border:1px solid var(--line);border-radius:14px;box-shadow:0 -8px 28px rgba(20,33,61,.08)}.question-nav button{justify-self:stretch}.question-nav button:disabled{opacity:.45;cursor:default}.question-position{font-weight:800;font-size:12px;color:var(--muted);white-space:nowrap}.answer-selected{border-color:var(--blue)!important;background:#f2f6ff!important}
.abstract-rebuild-notice{margin:12px 0;padding:12px 14px;border:1px solid #e1b94e;background:#fff9e8;border-radius:13px;display:flex;flex-direction:column;gap:4px;line-height:1.4}.abstract-rebuild-notice b{color:#7b5800}.abstract-rebuild-notice span{font-size:13px;color:#6c5c31}.abstract-isolated-card{margin:14px 0;padding:10px;border:1px solid var(--line);border-radius:14px;background:#fff;overflow:hidden}.abstract-isolated-card img{display:block;width:100%;height:auto;max-height:62vh;object-fit:contain;object-position:center;background:#fff}.abstract-isolated-card figcaption{padding:7px 4px 1px;text-align:center;font-size:12px;color:var(--muted)}
.verbal-passage{margin:14px 0;padding:14px;border:1px solid var(--line);border-radius:14px;background:#fbfcff;line-height:1.55;font-size:15px}.verbal-passage-label{font-size:11px;font-weight:850;letter-spacing:.04em;text-transform:uppercase;color:var(--blue);margin-bottom:7px}
@media(max-width:520px){.reasoning-guide summary{padding:11px 12px}.numeric-context-card,.numeric-data-card{margin:10px 0}.numeric-table-title{font-size:13px;padding:9px 10px 7px}.numeric-table-notes{padding:7px 10px 9px;font-size:11px}.question-nav{bottom:calc(58px + env(safe-area-inset-bottom));margin-left:-5px;margin-right:-5px;padding:8px}.question-nav button{padding:9px 8px;font-size:13px}.question-position{font-size:11px}.abstract-isolated-card{margin:10px 0;padding:6px}.abstract-isolated-card img{max-height:54vh}.verbal-passage{padding:12px;font-size:14px}}