/* Trade Theory — CHNM डिजिटल किताब · अतिरिक्त शैली (TM book untouched) */

.trade-hero {
  background:
    radial-gradient(circle at 86% 16%, rgba(224, 164, 61, .34), transparent 36%),
    radial-gradient(circle at 10% 94%, rgba(28, 92, 140, .55), transparent 46%),
    linear-gradient(135deg, #0d2b45, #164e73 56%, #6d3f12);
}
.trade-hero h1 { max-width: 880px; }
.trade-hero .lead { max-width: 780px; }

.book-switch {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin: 0 0 18px; padding: 10px 13px; border: 1px solid var(--line);
  background: var(--surface); border-radius: 12px; font-size: 12.5px; color: var(--muted);
}
.book-switch b { color: var(--ink); }
.book-switch .grow { flex: 1; min-width: 120px; }
.book-switch a { font-weight: 700; text-decoration: none; color: var(--brand-dark); }
.book-switch a:hover { text-decoration: underline; }

.trade-hub-note {
  background: linear-gradient(135deg, #fffaf0, #fdf4e3); border: 1px solid #edd9b0;
  border-radius: 12px; padding: 13px 15px; font-size: 12.5px; color: #5a3b0d;
  line-height: 1.7; margin-top: 20px;
}
.trade-hub-note b { color: #3f2907; }

/* ---------- tables ---------- */
.study-table-wrap { margin: 14px 0; overflow-x: auto; border: 1px solid var(--line); border-radius: 11px; background: #fff; }
.study-table { width: 100%; border-collapse: collapse; min-width: 480px; font-size: 12.8px; }
.study-table th, .study-table td { padding: 9px 11px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; line-height: 1.55; }
.study-table thead th { background: #eef5f8; color: var(--brand-dark); font-size: 11.8px; letter-spacing: .2px; }
.study-table tbody tr:nth-child(even) { background: #fbfdfe; }
.study-table tbody tr:last-child td { border-bottom: 0; }
.study-table td b { color: var(--ink); }
.table-caption { margin: 0; padding: 8px 11px; border-top: 1px solid var(--line); font-size: 11.5px; color: var(--muted); background: #f8fbfc; }

/* ---------- steps ---------- */
.step-list { list-style: none; margin: 14px 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.step-item {
  display: flex; gap: 10px; align-items: flex-start; border: 1px solid var(--line);
  border-radius: 11px; background: #fbfdfe; padding: 10px 12px;
}
.step-num {
  flex: none; width: 28px; height: 28px; border-radius: 9px; display: grid; place-items: center;
  background: var(--navy); color: #fff; font-weight: 800; font-size: 12px;
}
.step-body { min-width: 0; display: flex; flex-direction: column; gap: 2px; }
.step-title { font-size: 13.4px; line-height: 1.5; color: var(--ink); }
.step-desc { font-size: 12.8px; line-height: 1.65; color: #43525f; }
.step-desc code, .study-table code, .note-box code, .exam-box code { background: #eef3f6; border-radius: 4px; padding: 1px 4px; font-size: .92em; }

/* ---------- formulas ---------- */
.formula-box {
  margin: 14px 0; border: 1px solid #c6e8e0; background: #f4fbf9; border-radius: 11px;
  padding: 11px 13px; display: flex; flex-direction: column; gap: 6px;
}
.formula-label { font-size: 10.5px; letter-spacing: .7px; font-weight: 800; color: var(--brand-dark); }
.formula-line {
  display: block; background: #fff; border: 1px solid #d7ebe5; border-radius: 8px;
  padding: 7px 10px; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12.5px; color: #0b4a41; overflow-x: auto; white-space: nowrap;
}

/* ---------- notes / exam focus ---------- */
.note-box, .exam-box {
  margin: 14px 0; border-radius: 11px; padding: 11px 13px; font-size: 13px; line-height: 1.7;
}
.note-box { background: var(--surface-2); border: 1px solid var(--line-strong); color: #33414d; }
.exam-box { background: var(--accent-soft); border: 1px solid #edd9b0; color: #5a3b0d; }
.note-box b, .exam-box b { color: var(--ink); }

/* ---------- term cards ---------- */
.term-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 8px; margin: 13px 0; }
.term-card {
  border: 1px solid var(--line); background: #fff; border-radius: 10px; padding: 9px 11px;
  display: flex; flex-direction: column; gap: 3px;
}
.term-card b { font-size: 12.5px; color: var(--brand-dark); }
.term-card span { font-size: 12.2px; line-height: 1.55; color: var(--muted); }

/* ---------- calc field hint ---------- */
.field-hint { display: block; margin-top: 4px; font-size: 11px; color: var(--muted); line-height: 1.45; }
.calc-grid.one-col { grid-template-columns: 1fr; }

/* ---------- hub extras ---------- */
.trade-stats .hero-stat b { font-size: 24px; }
.trade-callout {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 9px;
  margin-top: 14px;
}
.trade-callout .mini {
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.16);
  border-radius: 10px; padding: 9px 11px; font-size: 11.6px; color: #dce9f1; line-height: 1.5;
}
.trade-callout .mini b { display: block; color: #fff; font-size: 12.6px; margin-bottom: 2px; }

/* ---------- chapter side badge ---------- */
.side-book {
  display: inline-flex; align-items: center; gap: 5px; font-size: 10.5px; font-weight: 800;
  letter-spacing: .3px; color: #6b4a0d; background: var(--accent-soft); border: 1px solid #edd9b0;
  border-radius: 999px; padding: 3px 8px; margin-bottom: 8px;
}

@media (max-width: 700px) {
  .step-item { padding: 9px 10px; }
  .study-table { min-width: 420px; }
  .term-grid { grid-template-columns: 1fr; }
}

@media print {
  .study-table-wrap { overflow: visible; break-inside: avoid; }
  .study-table { min-width: 0; font-size: 10.5px; }
  .step-item, .formula-box, .note-box, .exam-box, .term-card { break-inside: avoid; }
}

/* ================================================================== */
/* तकनीकी SVG चित्र — साझा शैली                                       */
/* ================================================================== */
.tech-svg {
  display: block; width: 100%; height: auto;
  background:
    radial-gradient(circle at 12% 0%, rgba(13, 107, 95, .07), transparent 46%),
    linear-gradient(180deg, #fbfdfe, #f2f8fa);
}
.tech-svg text, .live-sim svg text { font-family: inherit; }
.v-title { font-size: 13px; font-weight: 800; fill: #123246; }
.v-sub { font-size: 11px; fill: #5a6b79; }
.v-sub.bad { fill: #b42318; }
.v-sub.good { fill: #157f4b; }
.v-label { font-size: 10.5px; fill: #4a5d6b; font-weight: 600; }
.v-num { font-size: 13px; font-weight: 800; fill: var(--brand); }
.v-big { font-size: 21px; font-weight: 800; fill: #0d2b45; }
.v-badge-text { font-size: 11px; font-weight: 800; fill: #123246; }
.v-code-text { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; fill: #b9e8da; }
.v-strip-text { font-size: 10px; font-weight: 800; fill: #28414f; }
.v-key-text { font-size: 10.5px; font-weight: 800; fill: #35505c; }
.v-bit-text { font-size: 11px; font-weight: 800; fill: #28414f; }

.v-box { fill: #fff; stroke: #c9d8e1; stroke-width: 1.6; }
.v-box.brand { fill: #e8f5f2; stroke: #8ec9bf; }
.v-box.accent { fill: #fdf4e2; stroke: #e3c58c; }
.v-box.good-box { fill: #eef9f2; stroke: #8fc9a6; }
.v-box.warm-box { fill: #fff7ea; stroke: #e6c48e; }
.v-box.warn-box { fill: #fffaf0; stroke: #e6c48e; }
.v-box.bad { fill: #fdf0ee; stroke: #e3a39c; }

.v-zone { fill: #f7fbfc; stroke: #cfe0e7; stroke-width: 1.4; }
.v-zone.dmz { fill: #fff7e8; stroke: #e0c58f; }
.v-firewall { fill: #fff3e8; stroke: #d9a15c; stroke-width: 2; }
.v-layer { fill: #e8f2f6; stroke: #bcd4de; stroke-width: 1.3; }
.v-layer.brand { fill: #dcefeb; stroke: #8ec9bf; }
.v-layer.accent { fill: #fbf1dd; stroke: #e3c58c; }
.v-layer.warm { fill: #fdf0e0; stroke: #e6b57f; }
.v-server { fill: #eef5f8; stroke: #9db9c7; stroke-width: 1.6; }
.v-shield { fill: #e8f5f2; stroke: var(--brand); stroke-width: 2; }
.v-board { fill: #eef5f1; stroke: #a9c7bd; stroke-width: 1.6; }
.v-slot { fill: #3b5563; stroke: #2b414d; stroke-width: 1; }
.v-cloud { fill: #eef5f8; stroke: #b7cfd9; stroke-width: 1.6; }
.v-chart { fill: #fff; stroke: #cfe0e7; stroke-width: 1.4; }
.v-code { fill: #0c2533; stroke: #1d4356; }
.v-drum { fill: #eef5f8; stroke: #6f9bb3; stroke-width: 2; }
.v-platter { fill: #eaf2f6; stroke: #6f9bb3; stroke-width: 2; }
.v-track { fill: none; stroke: #a9c2ce; stroke-width: 1.2; stroke-dasharray: 5 4; }
.v-spindle { fill: #5a6b79; stroke: #fff; stroke-width: 2; }
.v-head { fill: var(--accent); stroke: #8a5a12; stroke-width: 1; }
.v-range { fill: rgba(13, 107, 95, .05); stroke: #9cc7bd; stroke-width: 1.4; stroke-dasharray: 4 5; }
.v-wifi { fill: var(--brand); }
.v-lock { fill: #fdf4e2; stroke: #b3801f; stroke-width: 1.5; }
.v-glass { fill: #dceef4; stroke: #9db9c7; stroke-width: 1.2; }
.v-paper { fill: #fff; stroke: #b9c9d2; stroke-width: 1.2; }
.v-lamp { fill: #fbe6b4; stroke: #c58b2a; stroke-width: 1.4; }
.v-eye { fill: #fff; stroke: #35505c; stroke-width: 2; }
.v-board { fill: #eef5f1; }
.v-key { fill: #fff; stroke: #c9d8e1; stroke-width: 1.3; }
.v-key.hot { fill: #fbf1dd; stroke: var(--accent); stroke-width: 2; }
.v-bit { stroke-width: 1.2; }
.v-bit.on { fill: #d8efe8; stroke: var(--brand); }
.v-bit.off { fill: #f0f3f5; stroke: #d3dde3; }
.v-port { stroke-width: 1.4; }
.v-port.bad { fill: #fdf0ee; stroke: #d99a92; }
.v-port.good { fill: #eef9f2; stroke: #8fc9a6; }
.v-disk { fill: #f4f9fb; stroke: #9db9c7; stroke-width: 1.4; }
.v-disk.fail { fill: #fdf0ee; stroke: #d99a92; }
.v-strip { fill: #e8f1f5; stroke: #c4d6de; stroke-width: 1; }
.v-strip.parity { fill: #fbf1dd; stroke: #e0c187; }
.v-bar-bg { fill: #eef3f6; }
.v-bar { fill: #cfdde6; }
.v-bar.hot { fill: var(--accent); }
.v-bar.brand { fill: var(--brand); }
.v-bar.warm { fill: #e0a43d; }

.v-line { fill: none; stroke: #8fa3b2; stroke-width: 2; stroke-linecap: round; }
.v-line.hot { stroke: var(--accent); }
.v-line.cool { stroke: #2f7fa8; }
.v-line.good { stroke: #157f4b; }
.v-line.bad { stroke: #b42318; }
.v-line.warm { stroke: #d97706; }
.v-line.dash { stroke-dasharray: 7 5; animation: v-dash 1.15s linear infinite; }
@keyframes v-dash { to { stroke-dashoffset: -24; } }

.v-token { fill: var(--accent); stroke: #fff; stroke-width: 2; filter: drop-shadow(0 1px 2px rgba(16, 47, 78, .28)); }
.v-token.hot { fill: var(--accent); }
.v-token.good { fill: #157f4b; }
.v-token.warm { fill: #d97706; }
.v-badge { fill: #fff; stroke: #c9d8e1; stroke-width: 1.3; }
.v-badge.brand { fill: #e8f5f2; stroke: #8ec9bf; }
.v-badge.warn { fill: #fffaf0; stroke: #e3c58c; }
.v-badge.bad { fill: #fdf0ee; stroke: #d99a92; }
.v-badge.good { fill: #eef9f2; stroke: #8fc9a6; }
.v-person-head { fill: #e8f5f2; stroke: var(--brand); stroke-width: 2; }
.v-bad-mark { font-size: 15px; font-weight: 800; fill: #b42318; }
.v-bit.on { fill: #d8efe8; }
.v-bit.off { fill: #f0f3f5; }

/* कीबोर्ड / वायरलेस चार्ट */
.tech-svg .chan0 { stroke: #2f7fa8; stroke-width: 2; fill: none; }
.tech-svg .chan1 { stroke: #0d6b5f; stroke-width: 2; fill: none; }
.tech-svg .chan2 { stroke: #c58b2a; stroke-width: 2; fill: none; }

/* ================================================================== */
/* अध्याय — विषय नेविगेशन, चित्र गैलरी                                */
/* ================================================================== */
.section-block, .media-section, #labs, #quizMount, #mastery, #viva { scroll-margin-top: 132px; }

.area-head {
  display: flex; gap: 12px; align-items: flex-start;
  margin: 28px 0 14px; padding-top: 14px; border-top: 1px solid var(--line);
}
.area-eyebrow {
  flex: none; margin-top: 3px; padding: 5px 10px; border-radius: 999px;
  background: var(--navy); color: #fff; font-size: 10px; font-weight: 800;
  letter-spacing: .8px; text-transform: uppercase;
}
.area-head h2 { margin: 0 0 3px; font-size: 20px; line-height: 1.35; }
.area-head p { margin: 0; color: var(--muted); font-size: 12.8px; line-height: 1.6; }

.topic-nav {
  position: sticky; top: calc(var(--header-h) + 8px); z-index: 30;
  display: flex; align-items: center; gap: 8px;
  margin: 18px 0 20px; padding: 7px 8px;
  background: rgba(255, 255, 255, .96); border: 1px solid var(--line);
  border-radius: 12px; box-shadow: 0 6px 18px rgba(16, 47, 78, .07);
  backdrop-filter: blur(10px);
}
.topic-nav-label {
  flex: none; font-size: 10px; font-weight: 800; letter-spacing: .7px;
  color: var(--muted-2); padding: 0 4px; text-transform: uppercase;
}
.topic-nav-scroll {
  flex: 1; min-width: 0; display: flex; gap: 5px;
  overflow-x: auto; padding-bottom: 2px; scrollbar-width: thin;
}
.topic-nav-scroll a {
  flex: none; display: inline-flex; align-items: center; gap: 6px;
  max-width: 270px; padding: 6px 9px; border: 1px solid transparent; border-radius: 8px;
  color: #40525f; font-size: 11.8px; font-weight: 600; text-decoration: none;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.topic-nav-scroll a span {
  flex: none; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 9.5px; font-weight: 800; color: var(--muted-2);
  background: var(--surface-2); border-radius: 5px; padding: 1px 5px;
}
.topic-nav-scroll a:hover { background: var(--surface-2); color: var(--ink); }
.topic-nav-scroll a.is-active {
  background: var(--brand-soft); border-color: #bfe3dc; color: var(--brand-dark);
}
.topic-nav-scroll a.is-active span { background: #fff; color: var(--brand-dark); }
.topic-nav-extra { flex: none; display: flex; gap: 4px; }
.topic-nav-extra a {
  padding: 6px 8px; border-radius: 8px; border: 1px solid var(--line);
  color: var(--muted); font-size: 11px; font-weight: 700; text-decoration: none;
  background: #fff;
}
.topic-nav-extra a:hover { border-color: var(--brand); color: var(--brand-dark); }

.media-section { margin: 30px 0 8px; }
.tech-gallery { display: grid; gap: 14px; }
.tech-figure {
  margin: 0; border: 1px solid var(--line); border-radius: 14px; overflow: hidden;
  background: #fff; box-shadow: 0 1px 0 rgba(16, 47, 78, .04);
}
.tech-frame { padding: 3px; background: #f2f8fa; }
.tech-caption {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
  padding: 11px 14px 13px; border-top: 1px solid var(--line);
}
.tech-caption b { display: block; font-size: 13.5px; color: var(--ink); line-height: 1.45; }
.tech-caption span { display: block; margin-top: 3px; font-size: 12px; color: var(--muted); line-height: 1.55; }
.diagram-toggle {
  flex: none; border: 1px solid var(--line-strong); background: var(--surface-2);
  color: var(--brand-dark); border-radius: 999px; padding: 6px 11px;
  font: inherit; font-size: 11px; font-weight: 700; cursor: pointer; white-space: nowrap;
}
.diagram-toggle:hover { border-color: var(--brand); background: var(--brand-soft); }
.tech-figure.is-paused .tech-svg { filter: saturate(.92); }

/* ================================================================== */
/* लाइव सिमुलेटर — साझा खोल और नियंत्रण                              */
/* ================================================================== */
.sim-live-card { border-color: #b9ded6; }
.sim-head .sim-kicker.is-live {
  display: inline-flex; align-items: center; gap: 6px;
  color: #7ef0c9;
}
.live-dot {
  width: 7px; height: 7px; border-radius: 50%; background: #57e2b5;
  box-shadow: 0 0 0 3px rgba(87, 226, 181, .22); flex: none;
  animation: live-pulse 1.5s ease-in-out infinite;
}
@keyframes live-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(87, 226, 181, .22); }
  50% { box-shadow: 0 0 0 7px rgba(87, 226, 181, .08); }
}

.live-sim {
  border: 1px solid #b9ded6; border-radius: 12px; overflow: hidden;
  background: #f7fbfa;
}
.live-top {
  display: flex; align-items: center; gap: 8px; padding: 8px 12px;
  background: linear-gradient(120deg, #07231f, #0c3a33);
  color: #d8fff4; font-size: 11.5px; font-weight: 700;
}
.live-top b { font-size: 9.5px; letter-spacing: 1.4px; color: #7ef0c9; }
.live-top span:last-child { color: #a9d8cc; font-weight: 600; min-width: 0; }
.live-stage { padding: 12px; background: #f9fcfc; overflow: hidden; }
.live-stage > svg { display: block; width: 100%; height: auto; }
.live-controls { padding: 10px 12px; border-top: 1px solid #dcebe7; background: #f1f9f6; }
.live-readout { padding: 10px 12px; border-top: 1px solid #dcebe7; background: #fff; }
.live-status {
  padding: 8px 12px; border-top: 1px solid #dcebe7; background: #fbfdfd;
  color: var(--muted); font-size: 11.8px; line-height: 1.55;
}
.live-status.good { color: #0b6b43; background: #f0fbf5; font-weight: 600; }
.live-status.bad { color: #b42318; background: #fff6f4; font-weight: 600; }

.live-row { display: flex; flex-wrap: wrap; gap: 10px 14px; align-items: flex-end; }
.live-field {
  display: flex; flex-direction: column; gap: 4px; min-width: 128px;
  color: #35505c; font-size: 11.4px; font-weight: 700;
}
.live-field output { color: var(--brand-dark); font-weight: 800; }
.live-field input[type="range"] { width: 100%; accent-color: var(--brand); }
.live-field .input { padding: 6px 8px; font-size: 12px; border-radius: 7px; }
.live-check {
  display: inline-flex; align-items: center; gap: 7px; padding-bottom: 5px;
  color: #35505c; font-size: 12px; font-weight: 600;
}
.live-check input { width: 16px; height: 16px; accent-color: var(--brand); }
.live-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(138px, 1fr)); gap: 8px; }
.live-stat {
  display: flex; flex-direction: column; gap: 2px; padding: 7px 9px;
  border: 1px solid var(--line); border-radius: 9px; background: var(--surface-2);
}
.live-stat span { font-size: 10.4px; font-weight: 700; color: var(--muted); letter-spacing: .2px; }
.live-stat b { font-size: 13px; color: var(--ink); line-height: 1.35; }
.live-stat.good { border-color: #bfe5ce; background: #f3fcf7; }
.live-stat.good b { color: #0b6b43; }
.live-stat.bad { border-color: #f2b8b1; background: #fff6f4; }
.live-stat.bad b { color: #b42318; }
.live-scope { display: block; width: 100%; height: auto; border-radius: 9px; }

.live-seg { display: inline-flex; border: 1px solid var(--line-strong); border-radius: 9px; overflow: hidden; }
.live-seg .seg {
  border: 0; border-right: 1px solid var(--line); background: #fff;
  padding: 7px 10px; color: #4a5a66; font: inherit; font-size: 11.4px; font-weight: 700; cursor: pointer;
}
.live-seg .seg:last-child { border-right: 0; }
.live-seg .seg:hover { background: var(--surface-2); }
.live-seg .seg.on { background: var(--brand); color: #fff; }
.ip-inputs { display: inline-flex; align-items: center; gap: 3px; }
.ip-octet { width: 52px; padding: 6px 4px; text-align: center; font-size: 12px; }

/* POST */
.post-wrap { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 12px; align-items: start; }
.post-pc {
  display: flex; flex-direction: column; gap: 4px; align-items: flex-start;
  padding: 14px; border-radius: 10px; color: #fff;
  background: linear-gradient(135deg, #102f4e, #0d6b5f);
}
.post-pc b { font-size: 16px; }
.post-pc small { font-size: 10.5px; color: #bcd8d3; line-height: 1.4; }
.post-led { width: 10px; height: 10px; border-radius: 50%; background: #48606e; }
.post-led.on { background: #5ef0b4; box-shadow: 0 0 10px #5ef0b4; }
.post-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 5px; }
.post-steps li {
  display: grid; grid-template-columns: 22px 92px minmax(0, 1fr); gap: 8px; align-items: center;
  padding: 5px 9px; border: 1px solid var(--line); border-radius: 8px; background: #fff;
  color: var(--muted); font-size: 11.5px;
}
.post-steps li span {
  width: 20px; height: 20px; border-radius: 6px; display: grid; place-items: center;
  background: var(--surface-2); color: var(--muted); font-size: 10px; font-weight: 800;
}
.post-steps li b { color: var(--ink); font-size: 12px; }
.post-steps li small { font-size: 10.6px; color: var(--muted); }
.post-steps li.done { border-color: #bfe5ce; background: #f4fcf8; }
.post-steps li.done span { background: #157f4b; color: #fff; }
.post-steps li.fail { border-color: #f2b8b1; background: #fff6f4; }
.post-steps li.fail span { background: #b42318; color: #fff; }

/* HDD */
.hdd-live { display: flex; align-items: center; justify-content: center; gap: 14px; flex-wrap: wrap; }
.hdd-svg { width: min(420px, 100%); height: auto; }
.hdd-rotor { transform-box: fill-box; transform-origin: center; animation: hdd-spin 1.4s linear infinite; }
.hdd-arm { transform-box: fill-box; transform-origin: 88% 88%; }
.hdd-arm.reading { animation: hdd-seek .7s ease-in-out; }
.hdd-badge {
  padding: 6px 10px; border: 1px solid var(--line); border-radius: 999px;
  background: #fff; color: var(--muted); font-size: 11px; font-weight: 700;
}
@keyframes hdd-spin { to { transform: rotate(360deg); } }
@keyframes hdd-seek {
  0% { transform: rotate(0); }
  38% { transform: rotate(-9deg); }
  72% { transform: rotate(5deg); }
  100% { transform: rotate(0); }
}

/* RAM */
.ram-live svg { display: block; width: 100%; height: auto; }
.ram-lanes { transition: opacity .25s ease; }

/* लेज़र प्रिंटर */
.print-live svg { display: block; width: 100%; height: auto; }
.pr-drum { transform-box: fill-box; transform-origin: center; animation: pr-spin 5s linear infinite; }
@keyframes pr-spin { to { transform: rotate(360deg); } }
.print-stages { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 9px; }
.print-stage {
  display: inline-flex; align-items: center; gap: 5px; padding: 5px 9px;
  border: 1px solid var(--line); border-radius: 999px; background: #fff;
  color: #51616d; font: inherit; font-size: 10.8px; font-weight: 700; cursor: pointer;
}
.print-stage span {
  width: 17px; height: 17px; border-radius: 50%; display: grid; place-items: center;
  background: var(--surface-2); font-size: 9.5px;
}
.print-stage.on { background: var(--accent-soft); border-color: #dcbb7d; color: #6b4a0d; }
.print-stage.on span { background: var(--accent); color: #fff; }

/* UPS */
.ups-live svg { display: block; width: 100%; height: auto; }
.ups-flag { margin-top: 7px; font-size: 12px; color: var(--muted); }
.ups-live.is-outage .ups-mains { opacity: .16; }
.ups-live.is-outage .ups-flag b { color: #b42318; }
.ups-live .ups-batt { transition: opacity .2s ease; }

/* सबनेट */
.subnet-live { display: flex; flex-direction: column; gap: 8px; }
.bit-row {
  display: flex; flex-wrap: wrap; align-items: center; gap: 2px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 10.5px;
}
.bit {
  width: 17px; padding: 2px 0; border-radius: 3px; text-align: center;
  background: #eef5f8; color: #35505c;
}
.bit.net { background: #dcefe9; color: #0b5a43; font-weight: 800; }
.bit.host { background: #fbf1dd; color: #7a4c08; font-weight: 800; }
.bit-gap { font-style: normal; padding: 0 2px; color: var(--muted-2); }
.subnet-bar { display: flex; height: 9px; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; }
.subnet-bar .net { background: var(--brand); }
.subnet-bar .host { background: #e0a43d; }
.subnet-note { margin: 0; color: var(--muted); font-size: 11.4px; }

/* VLAN */
.vlan-live svg { display: block; width: 100%; height: auto; }
.vlan-pc .v-box { transition: stroke .2s ease, stroke-width .2s ease; }
.vlan-pc.src .v-box { stroke: var(--accent); stroke-width: 3; }
.vlan-pc.dst .v-box { stroke: var(--brand); stroke-width: 3; }
#vRouterBox { opacity: .4; transition: opacity .2s ease; }
#vRouterBox.linked { opacity: 1; }

/* Wi-Fi */
.wifi-live svg { display: block; width: 100%; height: auto; }
.wifi-bars rect { fill: #d7e3e9; }
.wifi-bars rect.on { fill: var(--brand); }

/* RAID */
.raid-disks { display: grid; grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); gap: 8px; }
.raid-disk {
  position: relative; display: flex; flex-direction: column; gap: 4px;
  padding: 8px; border: 1px solid var(--line-strong); border-radius: 10px; background: #fff;
}
.raid-disk b { color: var(--muted); font-size: 11.2px; }
.raid-block {
  padding: 3px 6px; border: 1px solid #d3e2e8; border-radius: 5px; background: #eef5f8;
  color: #28414f; font-size: 11px; font-weight: 700; text-align: center;
}
.raid-block.parity { border-color: #e2c48d; background: #fbf1dd; color: #7a4c08; }
.raid-disk.fail { border-color: #e3a39c; background: #fff7f6; }
.raid-disk.fail .raid-block { opacity: .32; }
.raid-x {
  position: absolute; inset: 0; display: grid; place-items: center;
  color: #b42318; font-style: normal; font-size: 32px; font-weight: 800; opacity: .8;
}

/* chmod */
.chmod-live { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.chmod-role {
  display: flex; align-items: center; gap: 6px; padding: 6px 8px;
  border: 1px solid var(--line); border-radius: 9px; background: #fff;
}
.chmod-role b { margin-right: 2px; color: var(--muted); font-size: 10.5px; }
.chmod-bit {
  display: inline-flex; flex-direction: column; align-items: center; gap: 2px;
  color: #35505c; font-size: 11px; font-weight: 800; cursor: pointer;
}
.chmod-bit input { width: 16px; height: 16px; accent-color: var(--brand); }
.chmod-cmd {
  width: 100%; padding: 7px 9px; border-radius: 7px; background: #0c2533;
  color: #b9e8da; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 11.5px;
}
.chmod-oct {
  color: var(--brand-dark); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 15px; font-weight: 800; letter-spacing: .4px;
}
.chip-file {
  display: inline-block; padding: 2px 7px; border-radius: 6px;
  background: var(--surface-2); border: 1px solid var(--line);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 11px; color: #35505c;
}

/* DHCP DORA */
.dora-live svg { display: block; width: 100%; height: auto; }
.dora-arrow { opacity: .22; stroke-width: 3; transition: opacity .2s ease; }
.dora-arrow.on { opacity: 1; }

/* ================================================================== */
/* हब — विषय-वार प्रोमो, थीम कार्ड                                    */
/* ================================================================== */
.trade-stats { grid-template-columns: repeat(auto-fit, minmax(104px, 1fr)); max-width: 780px; }
.module-card.theme-safety { border-top: 3px solid #8a5a12; }
.module-card.theme-power { border-top: 3px solid #c58b2a; }
.module-card.theme-hardware { border-top: 3px solid #2f7fa8; }
.module-card.theme-storage { border-top: 3px solid #6f7f8c; }
.module-card.theme-network { border-top: 3px solid #0d6b5f; }
.module-card.theme-server { border-top: 3px solid #4b5d9a; }
.module-card.theme-security { border-top: 3px solid #9b3a32; }
.module-theme { margin: 0; color: var(--brand-dark); font-size: 10.5px; font-weight: 800; letter-spacing: .2px; }
.module-meta .module-live { background: #0c3a33; border-color: #0c3a33; color: #d8fff4; }
.module-meta .module-diagram { background: var(--accent-soft); border-color: #edd9b0; color: #6b4a0d; }

.topic-promo {
  display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 20px;
  margin: 26px 0; padding: 20px; border: 1px solid var(--line); border-radius: 16px;
  background:
    radial-gradient(circle at 95% 5%, rgba(197, 139, 42, .12), transparent 38%),
    linear-gradient(135deg, #f4fbf9, #fffaf0);
}
.topic-promo-copy h2 { margin: 8px 0 7px; font-size: 22px; line-height: 1.35; }
.topic-promo-copy p { margin: 0 0 14px; color: var(--muted); font-size: 13px; line-height: 1.65; }
.theme-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(146px, 1fr)); gap: 8px; align-content: start; }
.theme-card {
  display: flex; flex-direction: column; gap: 3px; padding: 10px;
  border: 1px solid var(--line); border-radius: 10px; background: #fff;
  color: var(--ink); text-decoration: none;
  transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}
.theme-card:hover { transform: translateY(-2px); border-color: var(--line-strong); box-shadow: var(--shadow-sm); }
.theme-card b { font-size: 12.2px; line-height: 1.4; }
.theme-card span { color: var(--muted); font-size: 10.8px; }
.theme-card small { color: var(--muted-2); font-size: 9.8px; }
.theme-ico {
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center;
  background: var(--brand-soft); font-size: 17px; flex: none;
}

/* ================================================================== */
/* विषय-वार सूची पेज                                                  */
/* ================================================================== */
.topics-hero {
  background:
    radial-gradient(circle at 86% 16%, rgba(224, 164, 61, .3), transparent 36%),
    radial-gradient(circle at 10% 94%, rgba(13, 107, 95, .5), transparent 46%),
    linear-gradient(135deg, #0b2238, #124a5a 58%, #6d3f12);
}
.topics-hero h1 { max-width: 820px; }
.topics-hero .lead { max-width: 780px; }

.topics-toolbar {
  position: sticky; top: calc(var(--header-h) + 8px); z-index: 25;
  display: flex; flex-direction: column; gap: 9px;
  margin: 20px 0 12px; padding: 11px;
  background: rgba(255, 255, 255, .96); border: 1px solid var(--line);
  border-radius: 13px; box-shadow: 0 6px 18px rgba(16, 47, 78, .06);
  backdrop-filter: blur(10px);
}
.topics-search { min-width: 0; width: 100%; }
.topics-theme-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.topics-theme-chips .chip { display: inline-flex; align-items: center; gap: 5px; padding: 6px 11px; font-size: 12px; }
.topics-theme-chips .chip.is-on { background: var(--brand); border-color: var(--brand); color: #fff; }
.topics-theme-chips .chip small { font-size: 10px; opacity: .72; }

.topics-resultbar {
  display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap;
  margin: 0 0 16px; padding: 0 2px; color: var(--muted); font-size: 12px;
}
.topics-resultbar p { margin: 0; color: var(--ink); font-weight: 700; }
.topics-legend { display: flex; gap: 13px; }
.topics-legend a { color: var(--brand-dark); font-weight: 700; text-decoration: none; }
.topics-legend a:hover { text-decoration: underline; }

.topics-list { display: flex; flex-direction: column; gap: 26px; }
.topic-theme-head {
  display: flex; align-items: center; gap: 10px;
  padding-bottom: 10px; margin-bottom: 12px; border-bottom: 2px solid var(--line);
}
.topic-theme-head h2 { margin: 0; font-size: 20px; line-height: 1.35; }
.topic-theme-head p { margin: 2px 0 0; color: var(--muted); font-size: 11.5px; }
.topic-chapter {
  margin-bottom: 10px; border: 1px solid var(--line); border-radius: 12px;
  overflow: hidden; background: var(--surface);
}
.topic-chapter-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 10px 13px; border-bottom: 1px solid var(--line); background: var(--surface-2);
}
.topic-chapter-title { display: flex; align-items: flex-start; gap: 9px; min-width: 0; color: var(--ink); text-decoration: none; }
.topic-chapter-title:hover b { color: var(--brand); }
.topic-chapter-num {
  width: 32px; height: 32px; border-radius: 9px; flex: none; display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand-dark);
  font-family: var(--font-display); font-size: 12px; font-weight: 800;
}
.topic-chapter-title b { display: block; font-size: 13.2px; line-height: 1.45; }
.topic-chapter-title small { display: block; margin-top: 1px; color: var(--muted); font-size: 10.8px; }
.topic-chapter-links { display: flex; flex-wrap: wrap; gap: 5px; }
.topic-chapter-links a {
  padding: 3px 8px; border: 1px solid var(--line-strong); border-radius: 999px;
  background: #fff; color: var(--muted); font-size: 10.4px; font-weight: 700; text-decoration: none;
}
.topic-chapter-links a:hover { border-color: var(--brand); color: var(--brand-dark); }
.topic-rows { display: flex; flex-direction: column; }
.topic-row {
  display: grid; grid-template-columns: 56px minmax(0, 1fr) auto 18px; gap: 10px;
  align-items: center; padding: 9px 13px; border-top: 1px solid #edf2f5;
  color: var(--ink); text-decoration: none; transition: background .15s ease;
}
.topic-row:first-child { border-top: 0; }
.topic-row:hover { background: #f4fbf9; }
.topic-row:hover .topic-name { color: var(--brand-dark); }
.topic-no {
  color: var(--brand-dark); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 10.4px; font-weight: 800;
}
.topic-name { font-size: 12.8px; line-height: 1.5; }
.topic-kind {
  padding: 2px 7px; border: 1px solid var(--line); border-radius: 999px;
  color: var(--muted); font-size: 10px; white-space: nowrap;
}
.topic-go { color: var(--brand); font-weight: 800; text-align: center; }
.study-empty { grid-column: 1 / -1; }

/* ================================================================== */
/* द्विभाषी पाठ, गहन अध्ययन, वाइवा, फुल फॉर्म                        */
/* ================================================================== */
.lang-switch {
  display: inline-flex; align-items: center; gap: 2px; margin-left: auto;
  padding: 4px; border: 1px solid var(--line); border-radius: 999px; background: #fff;
  box-shadow: var(--shadow-sm);
}
.lang-switch-label {
  padding: 0 7px; font-size: 9.5px; font-weight: 800; letter-spacing: .4px;
  text-transform: uppercase; color: var(--muted-2); white-space: nowrap;
}
.lang-btn {
  border: 0; background: transparent; color: var(--muted); border-radius: 999px;
  padding: 5px 11px; font: inherit; font-size: 11.5px; font-weight: 700; cursor: pointer;
  transition: background .15s ease, color .15s ease;
}
.lang-btn:hover { color: var(--brand-dark); background: var(--brand-soft); }
.lang-btn.is-on { background: var(--navy); color: #fff; }
.lang-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* भाषा-मोड: hi / both / en */
[data-lang="hi"] .en-only,
[data-lang="hi"] .en-note,
[data-lang="hi"] .en-heading,
[data-lang="hi"] .mastery-en,
[data-lang="hi"] .chapter-title-en,
[data-lang="hi"] .chapter-subtitle-en,
[data-lang="hi"] .chapter-tagline-en { display: none !important; }
[data-lang="en"] .hi-only,
[data-lang="en"] .hi-body,
[data-lang="en"] .hi-heading,
[data-lang="en"] .mastery-hi,
[data-lang="en"] .chapter-title-hi,
[data-lang="en"] .chapter-subtitle:not(.chapter-subtitle-en),
[data-lang="en"] .chapter-tagline:not(.chapter-tagline-en) { display: none !important; }

.chapter-title-en {
  font-family: var(--font-display); font-size: clamp(23px, 3.2vw, 33px); font-weight: 800;
  line-height: 1.2; letter-spacing: -.2px; color: var(--ink); margin: 0 0 5px;
}
.chapter-subtitle-en { color: var(--muted); }
.chapter-tagline-en { margin-top: -6px; }
.intro-en { background: linear-gradient(135deg, #f4f8ff, #eef3fb); border-color: #ccddf6; }
.lang-hint {
  margin: 8px 0 0 !important; padding-top: 8px; border-top: 1px dashed #ccddf6;
  font-size: 11.5px !important; color: var(--muted) !important;
}

.sec-titles { display: block; min-width: 0; }
.sec-titles .hi-heading, .sec-titles .en-heading { display: block; }
.sec-titles .en-heading {
  margin-top: 3px; font-family: var(--font); font-size: 12px; font-weight: 600;
  line-height: 1.45; letter-spacing: 0; color: var(--muted);
}
[data-lang="en"] .sec-titles .en-heading {
  margin-top: 0; font-size: 19px; font-weight: 800; color: var(--ink);
  font-family: var(--font-display);
}

.en-note {
  position: relative; margin: 14px 0 4px; padding: 12px 14px 12px 48px;
  border: 1px solid #ccddf6; border-radius: 11px;
  background: linear-gradient(135deg, #f7faff, #eef4fd);
}
.en-note::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  border-radius: 11px 0 0 11px; background: linear-gradient(#2f6fd0, #7aa7e8);
}
.en-note .lang-flag {
  position: absolute; left: 12px; top: 12px; display: grid; place-items: center;
  width: 25px; height: 20px; border-radius: 5px; background: #2f6fd0; color: #fff;
  font-size: 9.5px; font-weight: 800; letter-spacing: .6px;
}
.en-note p { margin: 0; font-size: 13.2px; line-height: 1.75; color: #26384d; }
.en-note p + p { margin-top: 7px; }
[data-lang="en"] .section-block .en-note {
  margin-top: 0; border-color: #dbe7f7; background: #fbfdff; padding: 0; border: 0;
  padding-left: 0;
}
[data-lang="en"] .section-block .en-note .lang-flag { display: none; }
[data-lang="en"] .section-block .en-note p { font-size: 14.5px; color: #23313d; }

.depth-section, .viva-section, .glossary-section, .model-section { margin: 34px 0; }

.mastery-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 14px; }
[data-lang="hi"] .mastery-grid,
[data-lang="en"] .mastery-grid { grid-template-columns: minmax(0, 1fr); }
.mastery-card {
  border: 1px solid var(--line); border-left: 4px solid var(--brand);
  border-radius: 12px; padding: 14px 16px; background: linear-gradient(180deg, #f9fcfd, #fff);
  min-width: 0;
}
.mastery-en { border-left-color: var(--accent); direction: ltr; text-align: left; }
.depth-kicker {
  font-size: 9.8px; font-weight: 800; letter-spacing: .8px; text-transform: uppercase;
  color: var(--brand-dark);
}
.mastery-en .depth-kicker { color: #8a5c10; }
.mastery-card h3 { margin: 4px 0 8px; font-size: 15px; line-height: 1.4; color: var(--ink); }
.mastery-card p { margin: 0 0 8px; font-size: 13px; line-height: 1.72; color: #35434f; }
.mastery-card .mastery-lead { color: #22313d; font-weight: 600; }
.mastery-card .step-list { margin: 11px 0; }
.mastery-card .step-num { width: 24px; height: 24px; border-radius: 7px; font-size: 10.5px; }
.mastery-card .step-title { font-size: 12.6px; }
.mastery-card .step-desc { font-size: 12.2px; }
.mastery-card .study-table-wrap { margin-top: 10px; }
.mastery-card .study-table { min-width: 380px; font-size: 11.8px; }
.mastery-card .study-table th, .mastery-card .study-table td { padding: 7px 8px; }

.viva-list { display: flex; flex-direction: column; gap: 8px; margin-top: 14px; }
.viva-item {
  border: 1px solid var(--line); border-radius: 11px; background: #fff; overflow: hidden;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.viva-item[open] { border-color: #b9d8d2; box-shadow: var(--shadow-sm); }
.viva-item summary {
  display: flex; align-items: flex-start; gap: 10px; padding: 11px 13px;
  cursor: pointer; list-style: none;
}
.viva-item summary::-webkit-details-marker { display: none; }
.viva-num {
  flex: none; display: grid; place-items: center; min-width: 30px; height: 23px;
  padding: 0 5px; border-radius: 6px; background: var(--brand-soft); color: var(--brand-dark);
  font-size: 10px; font-weight: 800;
}
.viva-question { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 3px; }
.viva-question .hi-only { font-size: 13.4px; line-height: 1.55; font-weight: 600; color: var(--ink); }
.viva-q-en { font-size: 12px; line-height: 1.5; color: var(--muted); font-weight: 500; }
.viva-toggle {
  flex: none; width: 22px; height: 22px; display: grid; place-items: center;
  border-radius: 6px; background: var(--surface-2); color: var(--muted);
  font-size: 16px; line-height: 1; transition: transform .18s ease, background .15s ease;
}
.viva-item[open] .viva-toggle { transform: rotate(45deg); background: var(--brand-soft); color: var(--brand-dark); }
.viva-answer { padding: 10px 14px 13px 53px; border-top: 1px dashed var(--line); background: #fbfdfe; }
.viva-answer p { margin: 0 0 7px; font-size: 13px; line-height: 1.72; color: #35434f; }
.viva-answer p:last-child { margin-bottom: 0; }
.viva-answer .en-only { color: var(--muted); }

.abbr-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(205px, 1fr));
  gap: 8px; margin-top: 14px;
}
.abbr-card {
  display: flex; flex-direction: column; gap: 2px; padding: 9px 11px;
  border: 1px solid var(--line); border-radius: 10px; background: #fff;
}
.abbr-card b { font-size: 12.8px; letter-spacing: .2px; color: var(--brand-dark); }
.abbr-card span { font-size: 11.8px; line-height: 1.45; color: var(--ink); }
.abbr-card small { font-size: 10.8px; line-height: 1.45; color: var(--muted); }
.gloss-abbr {
  text-decoration: none; border-bottom: 1px dotted var(--brand); color: inherit;
  cursor: help; background: linear-gradient(transparent 68%, rgba(13, 107, 95, .12) 68%);
}
.gloss-abbr:hover { color: var(--brand-dark); background: var(--brand-soft); }

/* ================================================================== */
/* 3D मॉडल — CSS 3D, बिना किसी बाहरी लाइब्रेरी                        */
/* ================================================================== */
.td-card {
  display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(240px, .65fr);
  gap: 0; margin-top: 14px; border: 1px solid var(--line); border-radius: 14px;
  overflow: hidden; background: #fff; box-shadow: var(--shadow-sm);
}
.td-stage {
  position: relative; height: 420px; overflow: hidden; touch-action: none; cursor: grab;
  background:
    linear-gradient(rgba(16, 47, 78, .055) 1px, transparent 1px) 0 0 / 28px 28px,
    linear-gradient(90deg, rgba(16, 47, 78, .055) 1px, transparent 1px) 0 0 / 28px 28px,
    radial-gradient(ellipse at 50% 22%, #ffffff, #eaf2f7 58%, #d9e6ee);
  perspective: 1100px; user-select: none; outline: none;
}
.td-stage:active { cursor: grabbing; }
.td-stage:focus-visible { box-shadow: inset 0 0 0 3px var(--accent); }
.td-floor {
  position: absolute; left: 50%; bottom: 44px; width: 340px; height: 76px;
  transform: translateX(-50%); border-radius: 50%;
  background: radial-gradient(ellipse, rgba(16, 47, 78, .28), transparent 68%);
  filter: blur(5px);
}
.td-model {
  position: absolute; inset: 0; transform-style: preserve-3d;
  transform: scale(var(--td-scale, 1)) rotateX(var(--rx, -18deg)) rotateY(var(--ry, 35deg));
  will-change: transform;
}
.td-cube {
  position: absolute; left: 50%; top: 50%;
  width: var(--w); height: var(--h);
  margin-left: calc(var(--w) / -2); margin-top: calc(var(--h) / -2);
  transform-style: preserve-3d;
}
.td-face {
  position: absolute; left: 50%; top: 50%;
  width: var(--w); height: var(--h);
  margin-left: calc(var(--w) / -2); margin-top: calc(var(--h) / -2);
  background: var(--c); border: 1px solid rgba(255, 255, 255, .34);
  box-shadow: inset 0 0 14px rgba(0, 0, 0, .22);
  backface-visibility: hidden;
}
.td-front { transform: translateZ(calc(var(--d) / 2)); }
.td-back { transform: rotateY(180deg) translateZ(calc(var(--d) / 2)); }
.td-right {
  width: var(--d); margin-left: calc(var(--d) / -2); filter: brightness(.84);
  transform: rotateY(90deg) translateZ(calc(var(--w) / 2));
}
.td-left {
  width: var(--d); margin-left: calc(var(--d) / -2); filter: brightness(.74);
  transform: rotateY(-90deg) translateZ(calc(var(--w) / 2));
}
.td-top {
  height: var(--d); margin-top: calc(var(--d) / -2); filter: brightness(1.2);
  transform: rotateX(90deg) translateZ(calc(var(--h) / 2));
}
.td-bottom {
  height: var(--d); margin-top: calc(var(--d) / -2); filter: brightness(.66);
  transform: rotateX(-90deg) translateZ(calc(var(--h) / 2));
}
.td-cube.is-glass .td-face {
  background: rgba(163, 213, 240, .2); border-color: rgba(35, 112, 168, .55);
  box-shadow: inset 0 0 24px rgba(56, 189, 248, .2);
  opacity: .72;
}
.td-cube.is-hot .td-face {
  border-color: #ffb300; box-shadow: inset 0 0 18px rgba(255, 193, 7, .4), 0 0 16px rgba(255, 152, 0, .55);
  filter: brightness(1.24);
}
.td-badge {
  position: absolute; left: 12px; top: 12px; z-index: 2;
  padding: 4px 9px; border: 1px solid rgba(16, 47, 78, .18); border-radius: 999px;
  background: rgba(255, 255, 255, .78); color: var(--navy); font-size: 9.8px;
  font-weight: 800; letter-spacing: .7px; text-transform: uppercase;
  backdrop-filter: blur(6px);
}
.td-side {
  padding: 15px 16px; border-left: 1px solid var(--line); background: #fbfdfe;
  display: flex; flex-direction: column; min-width: 0;
}
.td-side h3 { margin: 0 0 2px; font-size: 15.5px; line-height: 1.4; color: var(--ink); }
.td-sub {
  margin: 0 0 8px; font-size: 10.5px; font-weight: 800; letter-spacing: .4px;
  text-transform: uppercase; color: var(--brand-dark);
}
.td-caption { margin: 0 0 11px; font-size: 11.8px; line-height: 1.6; color: var(--muted); }
.td-parts {
  display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 12px;
  max-height: 188px; overflow: auto; padding-right: 2px;
}
.td-part-btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 4px 8px 4px 5px;
  border: 1px solid var(--line); border-radius: 999px; background: #fff;
  color: var(--muted); font: inherit; font-size: 10.4px; font-weight: 700;
  cursor: pointer; text-align: left; transition: border-color .15s ease, background .15s ease;
}
.td-part-btn i { width: 9px; height: 9px; border-radius: 3px; flex: none; box-shadow: inset 0 0 0 1px rgba(0,0,0,.15); }
.td-part-btn:hover { border-color: var(--brand); color: var(--brand-dark); }
.td-part-btn.is-on { border-color: var(--accent); background: var(--accent-soft); color: #6b4a0d; }
.td-controls { display: flex; gap: 7px; margin-top: auto; flex-wrap: wrap; }
.td-controls .btn { flex: 1; min-width: 96px; }
.td-auto-dot {
  display: inline-block; width: 7px; height: 7px; margin-right: 6px; border-radius: 50%;
  background: var(--good); box-shadow: 0 0 0 3px rgba(21, 127, 75, .14);
}
.td-card.is-paused .td-auto-dot { background: var(--muted-2); box-shadow: none; }
.td-model, .td-cube, .td-face { transition: none; }
.td-part-btn, .td-side { transition: background .15s ease, border-color .15s ease; }

/* ================================================================== */
/* छोटी स्क्रीन                                                        */
/* ================================================================== */
@media (max-width: 900px) {
  .topic-promo { grid-template-columns: 1fr; }
  .topic-nav-label { display: none; }
  .mastery-grid { grid-template-columns: 1fr; }
  .td-card { grid-template-columns: 1fr; }
  .td-stage {
    height: 340px; --td-scale: .92;
  }
  .td-side { border-left: 0; border-top: 1px solid var(--line); }
  .td-parts { max-height: none; }
}
@media (max-width: 700px) {
  .tech-caption { flex-direction: column; }
  .diagram-toggle { align-self: flex-start; }
  .post-wrap { grid-template-columns: 1fr; }
  .post-steps li { grid-template-columns: 22px 80px minmax(0, 1fr); }
  .topic-nav { top: calc(var(--header-h) + 4px); }
  .topic-nav-extra a { padding: 5px 6px; font-size: 10px; }
  .topic-row { grid-template-columns: 50px minmax(0, 1fr) 16px; gap: 8px; }
  .topic-kind { display: none; }
  .topic-chapter-head { align-items: flex-start; flex-direction: column; gap: 7px; }
  .topics-toolbar { top: calc(var(--header-h) + 4px); }
  .raid-disks { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .chmod-live { gap: 7px; }
  .bit { width: 14px; font-size: 9px; }
  .live-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .lang-switch { flex-basis: 100%; margin-left: 0; justify-content: space-between; padding: 5px; }
  .lang-switch-label { font-size: 9px; padding-left: 8px; }
  .lang-btn { flex: 1; padding: 6px 8px; }
  .en-note { padding: 11px 12px 11px 44px; }
  .en-note .lang-flag { left: 10px; }
  .viva-answer { padding: 10px 12px 12px; }
  .viva-question .hi-only { font-size: 13px; }
  .td-stage { height: 300px; --td-scale: .8; }
  .td-floor { width: 250px; bottom: 32px; }
  .td-side { padding: 13px 13px 14px; }
  .td-parts { max-height: none; }
  .abbr-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 440px) {
  .live-grid { grid-template-columns: 1fr; }
  .hero-row { gap: 8px; }
  .bit { width: 9px; border-radius: 2px; }
  .bit-gap { padding: 0; }
  .td-stage { height: 260px; --td-scale: .68; }
  .td-floor { width: 210px; }
  .abbr-grid { grid-template-columns: 1fr; }
  .mastery-card { padding: 12px 12px; }
  .viva-num { min-width: 26px; }
}

/* ================================================================== */
/* प्रिंट और कम-एनिमेशन                                               */
/* ================================================================== */
@media print {
  .topic-nav, .topics-toolbar, .live-controls, .live-status, .diagram-toggle,
  .topic-nav-extra, .tech-caption .diagram-toggle, .lang-switch,
  .td-controls, .td-parts, .td-badge { display: none !important; }
  .tech-frame, .tech-figure { break-inside: avoid; border-color: #ccc; }
  .tech-svg { background: #fff; }
  .live-sim { border-color: #ccc; }
  .live-stage { background: #fff; }
  .live-readout, .live-controls { background: #fff; }
  .mastery-card, .viva-item, .abbr-card, .td-card { break-inside: avoid; }
  .td-card { display: block; }
  .td-stage { height: 280px; background: #eef2f5 !important; print-color-adjust: exact; }
  .td-side { border: 0; padding: 8px 0 0; background: #fff; }
  .en-note { print-color-adjust: exact; }
}

@media (prefers-reduced-motion: reduce) {
  .v-line.dash, .live-dot, .hdd-rotor, .pr-drum, .hdd-arm.reading { animation: none !important; }
  .topic-row, .theme-card, .module-card { transition: none; }
  .ram-lanes, .vlan-pc .v-box, #vRouterBox { transition: none; }
}

/* ================================================================== */
/* अध्याय — कॉपी (रूल्ड नोटबुक) पठन सतह                              */
/* ================================================================== */
.chapter-article {
  --copy-line: 32px;
  position: relative;
  background-color: #fffdf7;
  background-image: linear-gradient(90deg,
    transparent 0 53px, rgba(196, 86, 86, .45) 53px 55px, transparent 55px);
  background-size: 100% 100%;
  border: 1px solid #d8cdb8;
  border-radius: 5px 16px 16px 5px;
  padding: 30px 32px 38px 78px;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, .9) inset,
    -7px 0 0 -4px #f4eddf inset,
    0 18px 40px -24px rgba(58, 44, 24, .4),
    0 2px 4px rgba(58, 44, 24, .08);
}
.chapter-article > * { position: relative; z-index: 1; }
.chapter-article p, .chapter-article li { color: #1f2d39; }
.section-block .hi-body {
  background-image: repeating-linear-gradient(to bottom,
    transparent 0 calc(var(--copy-line) - 1px),
    rgba(39, 104, 164, .14) calc(var(--copy-line) - 1px) var(--copy-line));
  background-size: 100% var(--copy-line);
  padding-bottom: 5px;
}
.section-block .hi-body > p {
  font-size: 15px;
  line-height: var(--copy-line);
  margin: 0 0 var(--copy-line);
}
.section-block .hi-body > p:last-child { margin-bottom: 0; }
.section-block .hi-body > ul, .section-block .hi-body > ol { margin: 0 0 var(--copy-line); }
.section-block .hi-body > ul > li, .section-block .hi-body > ol > li {
  font-size: 14.5px;
  line-height: var(--copy-line);
  margin: 0;
}
.en-note { border-left-color: rgba(196, 86, 86, .45); }
.chapter-tagline, .intro-box p { line-height: var(--copy-line); }
.section-block h2 .hi-heading,
[data-lang="en"] .section-block h2 .en-heading {
  background: linear-gradient(transparent 72%, rgba(255, 222, 122, .5) 72%);
  padding: 0 2px;
}
[data-lang="en"] .section-block .en-note {
  background-color: transparent;
  background-image: repeating-linear-gradient(to bottom,
    transparent 0 calc(var(--copy-line) - 1px),
    rgba(39, 104, 164, .14) calc(var(--copy-line) - 1px) var(--copy-line));
  background-size: 100% var(--copy-line);
  padding-bottom: 5px;
}
[data-lang="en"] .section-block .en-note p {
  font-size: 15px;
  line-height: var(--copy-line);
  margin: 0 0 var(--copy-line);
}
[data-lang="en"] .section-block .en-note p:last-child { margin-bottom: 0; }

@media (max-width: 900px) {
  .chapter-article { padding: 24px 20px 30px 58px; }
}
@media (max-width: 760px) {
  .chapter-article {
    --copy-line: 30px;
    padding: 22px 15px 28px 42px;
    background-image: linear-gradient(90deg,
      transparent 0 19px, rgba(196, 86, 86, .42) 19px 21px, transparent 21px);
    background-size: 100% 100%;
    border-radius: 4px 12px 12px 4px;
  }
  .section-block .hi-body > p,
  [data-lang="en"] .section-block .en-note p { font-size: 14.6px; line-height: var(--copy-line); margin-bottom: var(--copy-line); }
  .section-block .hi-body > ul > li, .section-block .hi-body > ol > li { font-size: 14px; line-height: var(--copy-line); }
  .chapter-tagline, .intro-box p { line-height: var(--copy-line); }
}
@media (max-width: 440px) {
  .chapter-article { padding: 18px 12px 26px 36px; }
  .section-block .hi-body > p,
  [data-lang="en"] .section-block .en-note p { font-size: 14.2px; }
  .section-block h2 .hi-heading { padding: 0 1px; }
}
@media print {
  .chapter-article {
    background: #fff;
    border: 0;
    padding: 0;
    box-shadow: none;
  }
  .section-block h2 .hi-heading { background: none; }
}