/* =================================================================
   TIDEL · Multimodal Reasoning QA — LIGHT catalog edition
   Standalone stylesheet on the roboticsdata.tidel.ai template:
   1100px editorial container · paper #d7d6d2 · navy #2b3a53 ·
   steel-blue #4d81b0 accent · floating translucent-white cards
   ================================================================= */

:root {
  --bg:          #d7d6d2;
  --text:        #2b3a53;
  --text-2:      rgba(43,58,83,0.62);
  --text-3:      rgba(43,58,83,0.34);
  --accent:      #4d81b0;
  --accent-2:    #7a9ec1;
  --border:      rgba(43,58,83,0.16);
  --border-strong: rgba(43,58,83,0.28);
  --card:        rgba(255,255,255,0.42);
  --navy:        #2b3a53;
  --paper:       #d7d6d2;
  --f-display: "Bricolage Grotesque","Noto Sans SC",sans-serif;
  --f-body: "DM Sans","Noto Sans SC",system-ui,sans-serif;
  --f-mono: "DM Mono",monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--f-body);
  font-weight: 400;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body {
  min-height: 100vh;
  position: relative;
  background:
    radial-gradient(ellipse 1000px 700px at 100% 0%, rgba(122,158,193,0.20), transparent 60%),
    radial-gradient(ellipse 900px 820px at 0% 100%, rgba(77,129,176,0.12), transparent 62%),
    var(--bg);
}
button { font-family: inherit; cursor: pointer; background: none; border: 0; padding: 0; color: inherit; }
ol, ul { list-style: none; }
.mono { font-family: var(--f-mono); }

.container { max-width: 1100px; margin: 0 auto; padding: 4rem 3rem 4.5rem; position: relative; z-index: 1; }

/* ============= Access gate ============= */
html.access-locked body { overflow: hidden; }
html.access-locked body > *:not(#accessGate) { visibility: hidden; }
.access-gate {
  position: fixed; inset: 0; z-index: 9999;
  display: flex; align-items: center; justify-content: center;
  background:
    radial-gradient(ellipse 1000px 700px at 100% 0%, rgba(122,158,193,0.24), transparent 60%),
    radial-gradient(ellipse 900px 820px at 0% 100%, rgba(77,129,176,0.14), transparent 62%),
    var(--bg);
  transition: opacity 0.32s ease;
}
.access-gate.fade-out { opacity: 0; pointer-events: none; }
.access-gate-card { width: 100%; max-width: 420px; padding: 48px 40px; text-align: center; color: var(--text); }
.access-logo {
  font-family: var(--f-display); font-size: 34px; font-weight: 700;
  letter-spacing: -0.03em; color: var(--text); margin-bottom: 6px;
}
.access-logo .dot { color: var(--accent); }
.access-sub {
  font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.16em;
  color: var(--text-3); text-transform: uppercase; margin-bottom: 34px;
}
.access-form { display: flex; flex-direction: column; gap: 10px; margin-bottom: 16px; }
.access-form.shake { animation: gateShake 0.35s ease; }
@keyframes gateShake {
  0%,100% { transform: translateX(0); }
  20% { transform: translateX(-6px); } 40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); } 80% { transform: translateX(4px); }
}
.access-input {
  width: 100%; padding: 14px 16px;
  background: rgba(255,255,255,0.55); border: 1px solid var(--border-strong);
  border-radius: 10px; color: var(--text);
  font-family: var(--f-mono); font-size: 14px; letter-spacing: 1px;
  text-align: center; outline: none;
  transition: border-color 0.15s ease, background 0.15s ease;
}
.access-input::placeholder { color: var(--text-3); letter-spacing: 0.5px; }
.access-input:focus { border-color: var(--accent); background: rgba(255,255,255,0.8); }
.access-submit {
  width: 100%; padding: 13px 16px; background: var(--accent); color: #fff;
  border-radius: 10px; font-family: var(--f-mono); font-size: 12px;
  letter-spacing: 2px; transition: background 0.15s ease;
}
.access-submit:hover { background: var(--navy); }
.access-error {
  font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.5px;
  color: #b0532e; height: 16px; opacity: 0; transition: opacity 0.15s ease;
}
.access-error.show { opacity: 1; }
.access-hint { font-size: 12.5px; color: var(--text-3); margin-top: 16px; }
.access-hint a { color: var(--accent); text-decoration: none; }
.access-hint a:hover { text-decoration: underline; }

/* ============= Topline ============= */
.topline {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 3.6rem;
  font-family: var(--f-mono); font-size: 0.74rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--text-3);
}
.wordmark {
  font-family: var(--f-display); font-size: 2rem; font-weight: 700;
  letter-spacing: -0.03em; color: var(--text); text-transform: none;
  line-height: 1; text-decoration: none;
}
.wordmark .dot { color: var(--accent); }
.contact { color: var(--accent); text-decoration: none; transition: color .15s; }
.contact:hover { color: var(--text); }

/* ============= Hero ============= */
.hero h1 {
  font-family: var(--f-display); font-size: 3.5rem; font-weight: 800;
  line-height: 1.02; letter-spacing: -0.03em; color: var(--text); margin-bottom: 1.5rem;
}
.hero h1 .accent { color: var(--accent); }
.hero .lede {
  font-size: 1.3rem; line-height: 1.5; color: var(--text);
  max-width: 780px; margin-bottom: 1rem; letter-spacing: -0.005em;
}
.hero .sub { font-size: 1rem; color: var(--text-2); max-width: 760px; line-height: 1.65; }

/* ============= Sample thumbnails strip ============= */
.hero-strip {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 1rem;
  margin-top: 2.4rem;
}
.hero-strip img {
  width: 100%; aspect-ratio: 4 / 3; object-fit: cover; display: block;
  border-radius: 14px; border: 1px solid var(--border); background: #fff;
  box-shadow: 0 10px 26px rgba(43,58,83,0.12);
}

/* ============= Section rule ============= */
.section-rule { margin: 3.6rem 0 1.8rem; display: flex; align-items: baseline; gap: 1.2rem; }
.section-rule .label {
  font-family: var(--f-mono); font-size: 0.74rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent); white-space: nowrap;
}
.section-rule .line { flex: 1; height: 1px; background: var(--border); }
.section-rule .count {
  font-family: var(--f-mono); font-size: 0.74rem; color: var(--text-3);
  letter-spacing: 0.06em; text-transform: uppercase;
}

/* ============= Tabs ============= */
.tabs-row { margin-bottom: 1.1rem; }
.tabs { display: flex; gap: 0.7rem; flex-wrap: wrap; }
.tab {
  font-family: var(--f-display); font-size: 1.02rem; font-weight: 600;
  letter-spacing: -0.01em; color: var(--text-2);
  padding: 0.7rem 1.3rem; border: 1px solid var(--border-strong); border-radius: 12px;
  background: transparent;
  transition: all 0.18s ease;
}
.tab:hover { color: var(--text); border-color: var(--accent); background: var(--card); }
.tab.active {
  background: var(--navy); border-color: var(--navy); color: var(--paper);
  box-shadow: 0 8px 20px rgba(43,58,83,0.18);
}

/* ============= Filter chips ============= */
.chips-row { display: flex; align-items: center; gap: 0.9rem; flex-wrap: wrap; margin-bottom: 1.4rem; }
.chips-label {
  font-family: var(--f-mono); font-size: 0.7rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--text-3); white-space: nowrap;
}
.chips { display: flex; gap: 0.45rem; flex-wrap: wrap; }
.chip {
  display: inline-flex; align-items: center; gap: 0.45rem;
  font-size: 0.82rem; color: var(--text-2);
  padding: 0.32rem 0.8rem; border: 1px solid var(--border); border-radius: 999px;
  background: var(--card); transition: all 0.15s ease;
}
.chip:hover { border-color: var(--accent); color: var(--text); }
.chip.active { background: var(--accent); border-color: var(--accent); color: #fff; }
.chip .chip-n { font-family: var(--f-mono); font-size: 0.7rem; color: var(--text-3); }
.chip.active .chip-n { color: rgba(255,255,255,0.75); }
.btn-random {
  margin-left: auto;
  font-family: var(--f-mono); font-size: 0.74rem; letter-spacing: 0.08em;
  color: var(--accent); padding: 0.36rem 0.9rem;
  border: 1px solid var(--border-strong); border-radius: 999px;
  transition: all 0.15s ease; white-space: nowrap;
}
.btn-random:hover { border-color: var(--accent); background: rgba(77,129,176,0.10); }

/* ============= Explorer card ============= */
.explorer {
  display: grid; grid-template-columns: minmax(0, 1fr) 350px;
  border: 1px solid var(--border); border-radius: 18px;
  background: var(--card);
  box-shadow: 0 18px 44px rgba(43,58,83,0.13);
  overflow: hidden;
}

/* --- left: question pane --- */
.qpane { padding: 1.9rem 2rem 2rem; min-width: 0; }
.qmeta { display: flex; align-items: center; gap: 0.7rem; margin-bottom: 1.1rem; flex-wrap: wrap; }
.qid { font-size: 0.78rem; color: var(--text-3); letter-spacing: 0.05em; }
.qbadges { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.qbadge {
  font-size: 0.74rem; font-weight: 500; color: var(--text-2);
  background: rgba(255,255,255,0.5); border: 1px solid var(--border);
  padding: 0.14rem 0.6rem; border-radius: 6px; letter-spacing: 0.02em;
}
.qbadge.qbadge-cat { color: #fff; background: var(--accent); border-color: var(--accent); }
.qnav { margin-left: auto; display: flex; align-items: center; gap: 0.5rem; }
.nav-btn {
  font-size: 1.25rem; line-height: 1; color: var(--text-2);
  border: 1px solid var(--border-strong); border-radius: 9px;
  width: 32px; height: 32px;
  display: inline-flex; align-items: center; justify-content: center;
  padding-bottom: 3px; transition: all 0.15s ease;
}
.nav-btn:hover { color: #fff; border-color: var(--accent); background: var(--accent); }
.qcount { font-size: 0.74rem; color: var(--text-2); letter-spacing: 0.08em; min-width: 60px; text-align: center; }

.qstage {
  background: #fff; border: 1px solid var(--border); border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  padding: 1rem; min-height: 200px;
  box-shadow: 0 1px 2px rgba(43,58,83,0.04);
}
.qstage img { max-width: 100%; max-height: 44vh; display: block; user-select: none; }

.qtext {
  font-size: 1.02rem; line-height: 1.75; color: var(--text);
  margin: 1.1rem 2px 0; white-space: pre-wrap;
}
.qtext-src {
  font-size: 0.8rem; line-height: 1.7; color: var(--text-3);
  margin: 0.55rem 2px 0; padding-left: 0.75rem;
  border-left: 2px solid var(--border); white-space: pre-wrap;
}
.qtext-src::before {
  content: 'SOURCE · ZH';
  display: block;
  font-family: var(--f-mono); font-size: 0.62rem; letter-spacing: 0.14em;
  color: var(--text-3); margin-bottom: 0.15rem;
}
.qoptions { display: flex; gap: 0.5rem; flex-wrap: wrap; margin: 0.8rem 2px 0; }
.qopt {
  font-family: var(--f-mono); font-size: 0.85rem; color: var(--text);
  border: 1px solid var(--border-strong); border-radius: 8px;
  padding: 0.3rem 0.9rem; background: rgba(255,255,255,0.5);
}
.qactions { display: flex; align-items: center; gap: 0.7rem; margin-top: 1.4rem; flex-wrap: wrap; }
.btn-step {
  background: var(--accent); color: #fff;
  font-size: 0.92rem; font-weight: 500; letter-spacing: 0.01em;
  padding: 0.68rem 1.25rem; border-radius: 10px;
  transition: background 0.15s ease, transform 0.15s ease;
}
.btn-step:hover { background: var(--navy); }
.btn-step:active { transform: scale(0.98); }
.btn-step:disabled { background: rgba(43,58,83,0.10); color: var(--text-3); cursor: default; transform: none; }
.btn-step .mono { font-size: 0.76rem; opacity: 0.85; }
.btn-answer {
  color: var(--text-2); font-size: 0.88rem;
  border: 1px solid var(--border-strong); border-radius: 10px;
  padding: 0.62rem 1.1rem; transition: all 0.15s ease;
}
.btn-answer:hover { color: var(--text); border-color: var(--accent); background: rgba(77,129,176,0.08); }
.btn-answer:disabled { color: var(--text-3); border-color: var(--border); cursor: default; background: none; }
.qhint { font-size: 0.8rem; color: var(--text-3); }

/* --- right: chain-of-thought pane --- */
.cotpane {
  border-left: 1px solid var(--border);
  background: rgba(255,255,255,0.26);
  padding: 1.9rem 1.6rem 1.8rem;
  display: flex; flex-direction: column;
}
.annot-head { padding-bottom: 1rem; border-bottom: 1px solid var(--border); }
.annot-title {
  font-family: var(--f-mono); font-size: 0.74rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 0.35rem;
}
.annot-task { font-size: 0.82rem; color: var(--text-2); }
.annot-count { font-size: 0.68rem; color: var(--text-3); letter-spacing: 0.12em; margin-top: 0.45rem; text-transform: uppercase; }

.cot { padding: 1rem 0 0.4rem; display: flex; flex-direction: column; gap: 0.7rem; }
.cot-step { display: grid; grid-template-columns: 34px 1fr; gap: 0.5rem; align-items: start; cursor: pointer; }
.cot-num { font-family: var(--f-mono); font-size: 0.7rem; color: var(--accent); letter-spacing: 0.04em; padding-top: 3px; }
.cot-text {
  font-size: 0.92rem; line-height: 1.7; color: rgba(43,58,83,0.85);
  white-space: pre-wrap; word-break: break-word;
  transition: filter 0.25s ease, opacity 0.25s ease;
}
.cot-step.veiled .cot-text { filter: blur(5px); opacity: 0.45; user-select: none; }
.cot-step.veiled .cot-num { color: var(--text-3); }
.cot-step.veiled:hover .cot-text { filter: blur(4px); opacity: 0.6; }
.cot-empty { font-size: 0.85rem; color: var(--text-3); padding: 0.3rem 0 0.6rem; }

/* answer inset: navy card on paper — the signature inversion */
.ans-card {
  position: relative; margin-top: 0.9rem;
  background: var(--navy); color: var(--paper);
  border-radius: 13px; padding: 0.95rem 1.1rem 1.05rem;
  cursor: pointer;
  box-shadow: 0 12px 28px rgba(43,58,83,0.22);
}
.ans-h {
  font-family: var(--f-mono); font-size: 0.64rem; letter-spacing: 0.16em;
  color: rgba(215,214,210,0.55); text-transform: uppercase; margin-bottom: 0.4rem;
}
.ans-body {
  font-size: 1rem; font-weight: 500; line-height: 1.6;
  white-space: pre-wrap; word-break: break-word;
  transition: filter 0.25s ease;
}
.ans-card.veiled .ans-body { filter: blur(7px); user-select: none; }
.ans-veil {
  position: absolute; inset: auto 1.1rem 0.65rem auto;
  font-family: var(--f-mono); font-size: 0.66rem; letter-spacing: 0.1em;
  color: var(--accent-2); display: none; text-transform: uppercase;
}
.ans-card.veiled .ans-veil { display: block; }

.raw-block { margin-top: 1rem; }
.btn-raw {
  font-size: 0.7rem; letter-spacing: 0.1em; color: var(--text-3);
  border: 1px solid var(--border); border-radius: 9px;
  padding: 0.45rem 0.8rem; width: 100%; text-align: left;
  transition: all 0.15s ease;
}
.btn-raw:hover { color: var(--text-2); border-color: var(--border-strong); background: rgba(255,255,255,0.35); }
.raw-pre {
  margin-top: 0.5rem; padding: 0.8rem;
  background: rgba(255,255,255,0.55); border: 1px solid var(--border); border-radius: 9px;
  font-size: 0.68rem; line-height: 1.55; color: var(--text-2);
  max-height: 300px; overflow: auto; white-space: pre-wrap; word-break: break-all;
}
.raw-pre::-webkit-scrollbar { width: 4px; height: 4px; }
.raw-pre::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 2px; }

/* ============= Footer ============= */
footer {
  margin-top: 3.4rem; padding-top: 1.8rem; border-top: 1px solid var(--border);
  display: flex; flex-wrap: wrap; gap: 0.8rem 2rem; align-items: center; justify-content: space-between;
  font-family: var(--f-mono); font-size: 0.74rem; color: var(--text-3); letter-spacing: 0.05em;
}
footer a { color: var(--accent); text-decoration: none; }
footer a:hover { color: var(--text); }

/* ============= Narrative sections (BabyVision article layout) ============= */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 350px;
  gap: 1rem 3rem;
  align-items: center;
}
.hero-kid { min-width: 0; }
.hero-kid img {
  width: 100%; display: block; user-select: none; pointer-events: none;
  /* flat warm-grey render bg melts into the paper page via a radial fade */
  -webkit-mask-image: radial-gradient(ellipse 72% 70% at 50% 52%, #000 52%, transparent 97%);
          mask-image: radial-gradient(ellipse 72% 70% at 50% 52%, #000 52%, transparent 97%);
}
.hero .head-meta { grid-column: 1 / -1; }
.kicker {
  font-size: 0.74rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 1.2rem;
}
.hero .sub em { font-style: italic; color: var(--text); }
.head-meta {
  display: flex; flex-wrap: wrap; gap: 0.6rem 2rem;
  margin-top: 1.8rem; padding-top: 1.1rem; border-top: 1px solid var(--border);
  font-size: 0.74rem; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-3);
}
.head-meta a { color: var(--accent); text-decoration: none; }
.head-meta a:hover { color: var(--text); }

.prose {
  font-size: 1.02rem; line-height: 1.7; color: var(--text-2);
  max-width: 760px; margin-bottom: 1.6rem;
}
.prose strong { color: var(--text); font-weight: 500; }

/* --- Task gallery --- */
.gallery {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem;
}
.gcard {
  border: 1px solid var(--border); border-radius: 16px;
  background: var(--card); overflow: hidden;
  box-shadow: 0 12px 30px rgba(43,58,83,0.10);
  display: flex; flex-direction: column;
}
.gimg {
  background: #fff; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  padding: 0.9rem; height: 200px;
}
.gimg img { max-width: 100%; max-height: 100%; object-fit: contain; display: block; }
.gcard figcaption {
  padding: 0.95rem 1.1rem 1.1rem;
  display: flex; flex-direction: column; gap: 0.55rem; flex: 1;
}
.gcat {
  font-size: 0.66rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent);
}
.gq { font-size: 0.88rem; line-height: 1.6; color: var(--text); flex: 1; }
.gans {
  align-self: flex-start; position: relative;
  font-size: 0.9rem; font-weight: 500; color: var(--text);
  border: 1px solid var(--border-strong); border-radius: 9px;
  padding: 0.38rem 0.85rem; background: rgba(255,255,255,0.5);
  transition: all 0.18s ease; text-align: left;
}
.gans b { font-weight: 600; transition: filter 0.25s ease; }
.gans .gans-label { display: none; white-space: nowrap; }
.gans.veiled { cursor: pointer; min-width: 120px; }
.gans.veiled b { filter: blur(6px); user-select: none; }
.gans.veiled .gans-label {
  display: inline; position: absolute; inset: 0;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 0.66rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent);
}
.gans.veiled:hover { border-color: var(--accent); }
.gans:not(.veiled) { border-color: var(--accent); background: rgba(77,129,176,0.10); cursor: default; }

/* --- Benchmark chart --- */
.chart {
  border: 1px solid var(--border); border-radius: 18px;
  background: var(--card); padding: 1.8rem 2rem 1.4rem;
  box-shadow: 0 18px 44px rgba(43,58,83,0.13);
  display: flex; flex-direction: column; gap: 0.85rem;
}
.crow { display: grid; grid-template-columns: 210px 1fr; align-items: center; gap: 1.1rem; }
.clabel { font-size: 0.88rem; color: var(--text-2); text-align: right; }
.crow.human .clabel { color: var(--text); font-weight: 500; }
.ctrack { display: flex; align-items: center; gap: 0.7rem; min-width: 0; }
.cbar {
  /* 0.82 head-room keeps the widest bar + its value inside the track
     without flex-shrink, which would distort bar proportions */
  width: calc(var(--w) * 0.82); flex: none; height: 18px; border-radius: 5px;
  background: var(--accent-2); opacity: 0.75;
  animation: chartGrow 0.9s cubic-bezier(0.22, 1, 0.36, 1) both;
}
.crow.human .cbar { background: var(--navy); opacity: 1; }
@keyframes chartGrow { from { width: 0; } }
.cval { font-size: 0.8rem; color: var(--text-2); }
.crow.human .cval { color: var(--text); font-weight: 500; }
.cnote {
  margin-top: 0.7rem; padding-top: 0.9rem; border-top: 1px solid var(--border);
  font-size: 0.7rem; letter-spacing: 0.03em; color: var(--text-3); line-height: 1.6;
}

/* --- Failure family grid --- */
.failgrid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.1rem; }
.failcard {
  border: 1px solid var(--border); border-radius: 16px;
  background: var(--card); padding: 1.4rem 1.5rem 1.3rem;
  box-shadow: 0 12px 30px rgba(43,58,83,0.10);
}
.fnum { font-size: 0.7rem; letter-spacing: 0.14em; color: var(--accent); margin-bottom: 0.55rem; }
.failcard h3 {
  font-family: var(--f-display); font-size: 1.18rem; font-weight: 700;
  letter-spacing: -0.015em; color: var(--text); margin-bottom: 0.5rem;
}
.failcard p { font-size: 0.9rem; line-height: 1.65; color: var(--text-2); margin-bottom: 0.8rem; }
.fmap {
  font-size: 0.68rem; letter-spacing: 0.05em; color: var(--text-3);
  padding-top: 0.7rem; border-top: 1px solid var(--border); line-height: 1.7;
}

/* --- Production strip --- */
.prodstrip {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem;
  margin-top: 3.4rem;
}
.prod {
  border-top: 2px solid var(--navy); padding-top: 0.9rem;
}
.prod-n {
  font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 0.45rem;
}
.prod p { font-size: 0.88rem; line-height: 1.65; color: var(--text-2); }

/* ============= Responsive ============= */
@media (max-width: 980px) {
  .container { padding: 3rem 1.6rem 3.5rem; }
  .topline { margin-bottom: 2.4rem; }
  .wordmark { font-size: 1.7rem; }
  .hero h1 { font-size: 2.4rem; }
  .hero .lede { font-size: 1.15rem; }
  .hero-strip { grid-template-columns: repeat(3, 1fr); }
  .hero-strip img:nth-child(n+4) { display: none; }
  .hero { grid-template-columns: 1fr; gap: 0.5rem; }
  .hero-kid { max-width: 330px; margin: 0.2rem auto 0; }
  .hero-kid img {
    aspect-ratio: 1 / 0.95; object-fit: cover; object-position: 50% 82%;
    -webkit-mask-image: radial-gradient(ellipse 74% 82% at 50% 55%, #000 55%, transparent 98%);
            mask-image: radial-gradient(ellipse 74% 82% at 50% 55%, #000 55%, transparent 98%);
  }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .failgrid { grid-template-columns: 1fr; }
  .prodstrip { grid-template-columns: 1fr; gap: 1.6rem; }
  .crow { grid-template-columns: 130px 1fr; gap: 0.7rem; }
  .clabel { font-size: 0.76rem; }
  .head-meta { gap: 0.6rem 1.2rem; }
  .explorer { grid-template-columns: 1fr; }
  .cotpane { border-left: 0; border-top: 1px solid var(--border); }
  .btn-random { margin-left: 0; }
  footer { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 2rem; }
  .gallery { grid-template-columns: 1fr; }
  .gimg { height: 170px; }
  .qpane { padding: 1.3rem 1.1rem 1.4rem; }
  .cotpane { padding: 1.3rem 1.1rem 1.3rem; }
  .qstage img { max-height: 38vh; }
  .qhint { display: none; }
  .tab { font-size: 0.92rem; padding: 0.6rem 1rem; }
}