:root {
  color-scheme: light;
  --ink: #172026;
  --muted: #5d6872;
  --line: #d9e0e5;
  --paper: #f7f9fa;
  --panel: #ffffff;
  --blue: #1f6feb;
  --teal: #0f8b8d;
  --green: #3a7d44;
  --red: #b23b3b;
  --gold: #9b6a17;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
}

.topbar {
  min-height: 280px;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: end;
  padding: 44px clamp(20px, 5vw, 72px);
  background:
    linear-gradient(90deg, rgba(23,32,38,.88), rgba(23,32,38,.46)),
    url("https://images.unsplash.com/photo-1518770660439-4636190af475?auto=format&fit=crop&w=1800&q=80") center/cover;
  color: white;
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(34px, 5vw, 64px);
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin: 0 0 16px;
  font-size: 22px;
  letter-spacing: 0;
}

.summary {
  display: grid;
  gap: 8px;
  justify-items: end;
  font-size: 14px;
}

.summary span {
  padding: 8px 10px;
  border: 1px solid rgba(255,255,255,.35);
  background: rgba(255,255,255,.12);
}

main {
  padding: 28px clamp(16px, 4vw, 56px) 56px;
}

.controls {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 13px;
}

input,
select {
  min-height: 42px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  padding: 0 12px;
  border-radius: 6px;
  font: inherit;
}

.overview {
  display: grid;
  grid-template-columns: 1.25fr .75fr;
  gap: 18px;
  margin-bottom: 28px;
}

.overview article,
.sources,
.compare,
.table-wrap,
.wechat-library,
.sensor-reading-library,
.mechanism-analysis,
.resonant-library {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
}

.compare {
  margin-bottom: 20px;
}

.tree {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.tree-group {
  border-left: 4px solid var(--blue);
  padding-left: 12px;
}

.tree-group:nth-child(2) { border-color: var(--teal); }
.tree-group:nth-child(3) { border-color: var(--green); }
.tree-group:nth-child(4) { border-color: var(--gold); }

.tree-group strong {
  display: block;
  margin-bottom: 8px;
}

.tree-group span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.65;
}

.bars {
  display: grid;
  gap: 10px;
}

.bar-row {
  display: grid;
  grid-template-columns: 84px 1fr 28px;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}

.bar-track {
  height: 9px;
  background: #e9eef2;
}

.bar-fill {
  height: 100%;
  background: var(--teal);
}

.section-title {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: baseline;
  margin-bottom: 14px;
}

.section-title p {
  margin: 0;
  color: var(--muted);
}

.section-title .section-kicker {
  margin: 0 0 5px;
  color: var(--teal);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
}

.section-title div h2 {
  margin-bottom: 0;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
  gap: 14px;
}

.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: #fff;
  display: grid;
  gap: 12px;
}

.card-head {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 12px;
}

.visual {
  min-height: 92px;
  border: 1px solid #cdd7de;
  background: #eef3f6;
  position: relative;
  overflow: hidden;
}

.visual::before,
.visual::after {
  content: "";
  position: absolute;
  background: #51616f;
}

.visual.mass::before { width: 42px; height: 42px; left: 25px; top: 25px; }
.visual.mass::after { width: 76px; height: 6px; left: 8px; top: 43px; background: repeating-linear-gradient(90deg, #51616f 0 8px, transparent 8px 14px); }
.visual.tuning::before { width: 56px; height: 9px; left: 18px; top: 30px; box-shadow: 0 24px 0 #51616f; }
.visual.tuning::after { width: 9px; height: 62px; left: 44px; top: 16px; }
.visual.diaphragm::before { width: 62px; height: 62px; border-radius: 50%; left: 14px; top: 14px; background: radial-gradient(circle, #a8b6c0 0 35%, #51616f 36% 100%); }
.visual.diaphragm::after { width: 86px; height: 8px; left: 3px; top: 42px; opacity: .35; }
.visual.hotplate::before { width: 56px; height: 42px; left: 18px; top: 25px; background: repeating-linear-gradient(90deg, #b23b3b 0 5px, #f0b35f 5px 10px); }
.visual.hotplate::after { width: 76px; height: 4px; left: 8px; top: 70px; }
.visual.electrode::before { width: 78px; height: 50px; left: 7px; top: 20px; background: repeating-linear-gradient(90deg, #51616f 0 5px, transparent 5px 10px); }
.visual.electrode::after { width: 78px; height: 4px; left: 7px; top: 45px; }
.visual.channel::before { width: 72px; height: 20px; left: 10px; top: 36px; border: 5px solid #51616f; background: transparent; }
.visual.channel::after { width: 26px; height: 26px; border-radius: 50%; left: 33px; top: 33px; background: var(--teal); opacity: .6; }

.card h3 {
  margin: 0 0 6px;
  font-size: 18px;
  line-height: 1.3;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  padding: 4px 7px;
  background: #eef5f4;
  border: 1px solid #d4e5e2;
  border-radius: 999px;
  color: #1f5e60;
  font-size: 12px;
}

.chain {
  padding: 10px;
  background: #f4f7f9;
  border-left: 3px solid var(--blue);
  font-size: 13px;
  line-height: 1.65;
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 14px;
}

.principle-card {
  border: 1px solid var(--line);
  padding: 14px;
  border-radius: 8px;
  background: #fff;
  display: grid;
  grid-template-rows: auto auto auto 1fr auto;
  gap: 12px;
}

.principle-card header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.principle-index {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  border: 1px solid #c8d7df;
  color: var(--teal);
  font: 700 12px/1 Arial, sans-serif;
}

.principle-card h3 {
  margin: 0;
  font-size: 17px;
}

.principle-formula {
  margin: 3px 0 0;
  color: var(--muted);
  font: 12px/1.4 Consolas, "Microsoft YaHei", sans-serif;
}

.principle-figure {
  margin: 0;
  border: 1px solid #d4dde3;
  background: #f5f8fa;
}

.diagram-scene {
  height: 150px;
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(#e8eef2 1px, transparent 1px),
    linear-gradient(90deg, #e8eef2 1px, transparent 1px);
  background-size: 20px 20px;
}

.principle-figure figcaption {
  padding: 6px 9px;
  border-top: 1px solid #d4dde3;
  color: #6b7780;
  background: #fff;
  font-size: 10px;
}

.diagram-output {
  position: absolute;
  right: 13px;
  bottom: 13px;
  min-width: 39px;
  padding: 4px 6px;
  border: 1px solid var(--teal);
  background: #fff;
  color: #126b6d;
  font: 700 12px/1 Consolas, monospace;
  text-align: center;
}

.motion-arrow,
.load-arrow,
.flow-arrow,
.drive {
  position: absolute;
  color: var(--red);
  font: 700 12px/1 Arial, sans-serif;
}

.capacitive .plate {
  position: absolute;
  left: 55px;
  width: 150px;
  height: 9px;
  background: #4c6070;
  box-shadow: 0 0 0 1px #34434f;
}

.capacitive .plate-top { top: 48px; }
.capacitive .plate-bottom { top: 95px; }
.capacitive .motion-arrow { left: 121px; top: 18px; }
.capacitive .motion-arrow::after { content: "↓"; display: block; font-size: 22px; text-align: center; }
.capacitive .field-lines { position: absolute; left: 91px; top: 66px; color: var(--blue); letter-spacing: 8px; }

.piezoresistive .bend-beam {
  position: absolute;
  left: 42px;
  top: 73px;
  width: 182px;
  height: 14px;
  border: 3px solid #4c6070;
  border-top: 0;
  transform: skewY(-5deg);
  background: #dce5ea;
}

.piezoresistive .bend-beam::before {
  content: "";
  position: absolute;
  left: -13px;
  top: -16px;
  width: 14px;
  height: 44px;
  background: #4c6070;
}

.piezoresistive .load-arrow { left: 174px; top: 24px; }
.piezoresistive .load-arrow::after { content: " ↓"; font-size: 21px; }
.piezoresistive .resistor-track { position: absolute; left: 69px; top: 54px; color: var(--red); font: 700 19px/1 monospace; letter-spacing: 1px; }

.piezoelectric .piezo-layer {
  position: absolute;
  left: 54px;
  top: 60px;
  width: 150px;
  height: 42px;
  border: 7px solid #4c6070;
  background: #c9e5df;
}

.piezoelectric .load-arrow { left: 120px; top: 21px; }
.piezoelectric .load-arrow::after { content: " ↓"; font-size: 21px; }
.piezoelectric .charge { position: absolute; left: 100px; color: var(--blue); font: 700 14px/1 Arial; letter-spacing: 5px; }
.piezoelectric .charge-plus { top: 43px; }
.piezoelectric .charge-minus { top: 108px; color: var(--red); }

.resonant .spring {
  position: absolute;
  left: 38px;
  top: 67px;
  width: 83px;
  height: 18px;
  background: repeating-linear-gradient(135deg, transparent 0 8px, #4c6070 8px 11px, transparent 11px 19px);
  border-left: 8px solid #4c6070;
}

.resonant .resonator-mass {
  position: absolute;
  left: 121px;
  top: 48px;
  width: 54px;
  height: 54px;
  background: #90a4b1;
  border: 3px solid #4c6070;
}

.resonant .drive { left: 43px; top: 37px; }
.resonant .wave { position: absolute; left: 183px; top: 60px; color: var(--blue); font: 700 25px/1 monospace; transform: rotate(90deg); }

.thermal .flow-arrow { left: 24px; top: 20px; color: var(--blue); letter-spacing: 1px; }
.thermal .heater {
  position: absolute;
  left: 120px;
  top: 70px;
  width: 30px;
  height: 30px;
  border: 5px solid var(--red);
  background: #ffc857;
}

.thermal .thermistor {
  position: absolute;
  top: 77px;
  width: 42px;
  height: 16px;
  background: repeating-linear-gradient(90deg, #4c6070 0 5px, #dfe7eb 5px 9px);
  border: 1px solid #4c6070;
}

.thermal .upstream { left: 50px; }
.thermal .downstream { left: 181px; }
.thermal .heat-wave { position: absolute; left: 108px; top: 42px; color: var(--red); font: 700 18px/1 monospace; transform: rotate(-90deg); }

.optical .light-source {
  position: absolute;
  left: 24px;
  top: 65px;
  width: 25px;
  height: 25px;
  border-radius: 50%;
  background: #ffc857;
  box-shadow: 0 0 14px #ffc857;
}

.optical .light-beam { position: absolute; height: 3px; background: var(--red); transform-origin: left center; }
.optical .beam-in { left: 48px; top: 76px; width: 78px; }
.optical .beam-ref { left: 123px; top: 76px; width: 73px; transform: rotate(-35deg); }
.optical .beam-sense { left: 123px; top: 76px; width: 76px; transform: rotate(35deg); }
.optical .beam-splitter { position: absolute; left: 119px; top: 62px; width: 8px; height: 31px; background: var(--blue); transform: rotate(45deg); }
.optical .moving-mirror { position: absolute; left: 190px; top: 92px; width: 48px; height: 7px; background: #4c6070; transform: rotate(-35deg); }

.electrochemical .liquid {
  position: absolute;
  left: 35px;
  top: 47px;
  width: 190px;
  height: 78px;
  border: 3px solid #4c6070;
  border-top: 0;
  background: rgba(31, 111, 235, .13);
}

.electrochemical .electrode { position: absolute; top: 31px; width: 13px; height: 77px; background: #4c6070; z-index: 1; }
.electrochemical .e-work { left: 72px; }
.electrochemical .e-ref { left: 124px; height: 61px; background: var(--gold); }
.electrochemical .e-counter { left: 179px; }
.electrochemical .molecules { position: absolute; left: 83px; top: 91px; color: var(--red); letter-spacing: 8px; z-index: 2; }

.fet .source-node,
.fet .drain-node {
  position: absolute;
  top: 91px;
  width: 48px;
  height: 28px;
  background: #4c6070;
}

.fet .source-node { left: 38px; }
.fet .drain-node { left: 178px; }
.fet .fet-channel { position: absolute; left: 84px; top: 101px; width: 96px; height: 9px; background: var(--teal); }
.fet .electrolyte-gate { position: absolute; left: 57px; top: 43px; width: 150px; height: 38px; border-bottom: 4px solid var(--blue); background: rgba(31,111,235,.1); }
.fet .analytes { position: absolute; left: 93px; top: 56px; color: var(--red); letter-spacing: 9px; }

.acoustic .idt {
  position: absolute;
  top: 59px;
  width: 58px;
  height: 53px;
  background: repeating-linear-gradient(90deg, #4c6070 0 5px, transparent 5px 10px);
  border-top: 5px solid #4c6070;
}

.acoustic .idt-left { left: 30px; }
.acoustic .idt-right { left: 177px; }
.acoustic .surface-wave { position: absolute; left: 88px; top: 75px; color: var(--blue); font: 700 24px/1 monospace; }
.acoustic .mass-dots { position: absolute; left: 116px; top: 48px; color: var(--red); letter-spacing: 7px; }

.principle-signal {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 5px;
  color: #43515c;
  font-size: 11px;
  text-align: center;
}

.principle-signal span {
  padding: 6px 4px;
  background: #eef4f6;
}

.principle-signal b {
  color: var(--teal);
}

.principle-copy {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
  font-size: 13px;
}

.principle-source {
  color: #1557b0;
  font-size: 11px;
  line-height: 1.45;
  text-decoration: none;
}

.principle-source:hover {
  text-decoration: underline;
}

.sources {
  margin-top: 20px;
}

.sources a {
  color: #1557b0;
}

.wechat-library {
  margin-top: 20px;
}

.sensor-reading-library {
  margin-top: 20px;
}

.mechanism-analysis {
  margin-top: 20px;
}

.mechanism-method {
  display: grid;
  grid-template-columns: 82px 1fr;
  gap: 12px;
  padding: 11px 12px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #f4f7f9;
}

.mechanism-method strong {
  color: var(--ink);
  font-size: 11px;
}

.mechanism-method p {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.65;
}

.mechanism-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(110px, 150px)) 1fr;
  align-items: center;
  gap: 14px;
  padding: 15px 0;
}

.mechanism-summary div {
  display: flex;
  align-items: baseline;
  gap: 7px;
}

.mechanism-summary strong {
  color: var(--teal);
  font: 700 28px/1 Arial, sans-serif;
}

.mechanism-summary span,
.mechanism-summary p {
  color: var(--muted);
  font-size: 11px;
}

.mechanism-summary p {
  margin: 0;
  text-align: right;
}

.mechanism-share-layout {
  display: grid;
  grid-template-columns: minmax(460px, 1fr) minmax(210px, .42fr);
  gap: 26px;
  padding: 17px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.mechanism-share-bars {
  display: grid;
  gap: 2px;
}

.mechanism-share-row {
  min-height: 32px;
  display: grid;
  grid-template-columns: 9px 86px minmax(100px, 1fr) 42px 50px;
  align-items: center;
  gap: 9px;
  width: 100%;
  padding: 5px 7px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.mechanism-share-row:hover,
.mechanism-share-row:focus-visible {
  background: #f1f6f6;
}

.mechanism-share-row > i {
  width: 9px;
  height: 9px;
}

.mechanism-share-row > span {
  font-size: 11px;
}

.mechanism-share-row > strong,
.mechanism-share-row > b {
  font: 700 11px/1 Arial, sans-serif;
  text-align: right;
}

.mechanism-share-row > b {
  color: var(--muted);
}

.mechanism-share-track {
  height: 8px;
  background: #e8edf0;
  overflow: hidden;
}

.mechanism-share-track div {
  min-width: 2px;
  height: 100%;
}

.mechanism-ring-wrap {
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 13px;
}

.mechanism-ring {
  width: 174px;
  height: 174px;
  border-radius: 50%;
  display: grid;
  place-items: center;
}

.mechanism-ring > div {
  width: 104px;
  height: 104px;
  border-radius: 50%;
  display: grid;
  place-content: center;
  gap: 4px;
  background: var(--panel);
  text-align: center;
}

.mechanism-ring strong {
  color: var(--ink);
  font: 700 26px/1 Arial, sans-serif;
}

.mechanism-ring span,
.mechanism-ring-wrap p {
  color: var(--muted);
  font-size: 10px;
}

.mechanism-ring-wrap p {
  max-width: 210px;
  margin: 0;
  line-height: 1.55;
  text-align: center;
}

.mechanism-article-controls {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 12px;
  margin-top: 17px;
}

.mechanism-article-list {
  margin-top: 9px;
  border-top: 1px solid var(--line);
}

.mechanism-article {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.mechanism-article-image {
  min-height: 145px;
  position: relative;
  overflow: hidden;
  border-left: 4px solid var(--teal);
  background: #eef3f5;
}

.mechanism-article-image img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.mechanism-signal-placeholder {
  min-height: 145px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.mechanism-signal-placeholder i {
  display: block;
  width: 13px;
  height: 52px;
}

.mechanism-signal-placeholder i:nth-child(2) {
  height: 82px;
}

.mechanism-article-meta,
.mechanism-evidence,
.secondary-mechanisms {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.mechanism-article-meta span,
.mechanism-article-meta time {
  color: var(--muted);
  font-size: 10px;
}

.mechanism-article-meta span {
  padding: 3px 6px;
  border: 1px solid var(--line);
}

.mechanism-article-meta .primary {
  background: #f8fafb;
  font-weight: 700;
}

.mechanism-article-body h3 {
  margin: 8px 0 7px;
  font-size: 17px;
  line-height: 1.45;
}

.mechanism-article-body h3 a {
  color: var(--ink);
  text-decoration: none;
}

.mechanism-article-body h3 a:hover {
  color: #1557b0;
}

.mechanism-article-body > p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}

.mechanism-evidence,
.secondary-mechanisms {
  margin-top: 9px;
}

.mechanism-evidence strong,
.secondary-mechanisms strong {
  margin-right: 3px;
  font-size: 10px;
}

.mechanism-evidence span,
.secondary-mechanisms span {
  padding: 3px 5px;
  background: #edf3f6;
  color: #41525d;
  font-size: 10px;
}

.secondary-mechanisms span {
  background: #f8f2e7;
  color: #765718;
}

.mechanism-article details {
  margin-top: 9px;
  border-top: 1px dashed var(--line);
}

.mechanism-article summary {
  padding-top: 9px;
  color: #1557b0;
  font-size: 11px;
  cursor: pointer;
}

.mechanism-article details p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.6;
}

.mechanism-article details a {
  display: inline-block;
  margin-top: 8px;
  color: #1557b0;
  font-size: 11px;
}

.resonant-library {
  margin-top: 20px;
}

.resonant-definition {
  display: grid;
  grid-template-columns: minmax(360px, .8fr) 1.2fr;
  gap: 18px;
  align-items: center;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.resonant-definition p {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.65;
}

.resonant-definition p strong {
  color: var(--ink);
}

.resonant-model {
  display: grid;
  grid-template-columns: 1fr auto 1.4fr auto 1fr;
  align-items: center;
  gap: 7px;
}

.resonant-model span {
  min-height: 44px;
  padding: 7px;
  border: 1px solid #cfdbe1;
  background: #f2f7f8;
  display: grid;
  place-items: center;
  color: #31424d;
  font-size: 11px;
  text-align: center;
}

.resonant-model b {
  color: var(--teal);
}

.resonant-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(100px, 150px)) 1fr;
  gap: 14px;
  align-items: center;
  padding: 14px 0;
}

.resonant-stats div {
  display: flex;
  align-items: baseline;
  gap: 7px;
}

.resonant-stats strong {
  color: var(--teal);
  font: 700 28px/1 Arial, sans-serif;
}

.resonant-stats span,
.resonant-stats p {
  color: var(--muted);
  font-size: 11px;
}

.resonant-stats p {
  margin: 0;
  text-align: right;
}

.resonant-family-strip {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.resonant-family-strip button {
  min-height: 45px;
  border: 0;
  padding: 7px 9px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.resonant-family-strip button:hover {
  background: #edf6f4;
}

.resonant-family-strip span {
  font-size: 11px;
}

.resonant-family-strip b {
  color: var(--teal);
  font: 700 11px/1 Arial, sans-serif;
}

.resonant-controls {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr auto;
  gap: 12px;
  align-items: end;
  margin-top: 14px;
}

.resonant-article-list {
  margin-top: 9px;
  border-top: 1px solid var(--line);
}

.resonant-article {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.resonant-article-visual {
  min-height: 145px;
  position: relative;
  overflow: hidden;
  background: #eef3f5;
}

.resonant-article-visual img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.resonant-wave {
  height: 145px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
}

.resonant-wave i {
  display: block;
  width: 5px;
  height: 32px;
  background: var(--teal);
  animation: resonant-pulse 1.4s ease-in-out infinite;
}

.resonant-wave i:nth-child(2) {
  height: 64px;
  animation-delay: .15s;
}

.resonant-wave i:nth-child(3) {
  height: 44px;
  animation-delay: .3s;
}

@keyframes resonant-pulse {
  50% { transform: scaleY(.55); opacity: .55; }
}

.resonant-article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.resonant-article-meta span,
.resonant-article-meta time {
  color: var(--muted);
  font-size: 10px;
}

.resonant-article-meta span {
  padding: 3px 6px;
  border: 1px solid var(--line);
}

.resonant-article-meta .confidence.definite {
  border-color: #9dcbb2;
  background: #e9f6ef;
  color: #24623f;
}

.resonant-article-meta .confidence.possible {
  border-color: #dfc994;
  background: #fbf5e8;
  color: #805f15;
}

.resonant-article-body h3 {
  margin: 8px 0 7px;
  font-size: 17px;
}

.resonant-article-body h3 a {
  color: var(--ink);
  text-decoration: none;
}

.resonant-article-body h3 a:hover {
  color: #1557b0;
}

.resonant-article-body > p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}

.resonant-evidence {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  align-items: center;
  margin-top: 9px;
}

.resonant-evidence strong {
  margin-right: 3px;
  font-size: 10px;
}

.resonant-evidence span {
  padding: 3px 5px;
  background: #edf3f6;
  color: #41525d;
  font-size: 10px;
}

.resonant-article details {
  margin-top: 9px;
  border-top: 1px dashed var(--line);
}

.resonant-article summary {
  padding-top: 9px;
  color: #1557b0;
  font-size: 11px;
  cursor: pointer;
}

.resonant-article details p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.6;
}

.resonant-article details a {
  display: inline-block;
  margin-top: 8px;
  color: #1557b0;
  font-size: 11px;
}

.archive-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(110px, 150px)) 1fr;
  align-items: center;
  gap: 14px;
  padding: 15px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.archive-stats div {
  display: flex;
  align-items: baseline;
  gap: 7px;
}

.archive-stats strong {
  color: var(--teal);
  font: 700 29px/1 Arial, sans-serif;
}

.archive-stats span,
.archive-stats p {
  color: var(--muted);
  font-size: 11px;
}

.archive-stats p {
  margin: 0;
  text-align: right;
  line-height: 1.55;
}

.archive-category-strip {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  margin: 17px 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.archive-category-strip button {
  min-height: 48px;
  border: 0;
  background: #fff;
  color: var(--ink);
  padding: 8px 10px;
  font: inherit;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 7px;
  text-align: left;
}

.archive-category-strip button:hover {
  background: #edf6f4;
}

.archive-category-strip b {
  color: var(--teal);
  font: 700 11px/1 Arial, sans-serif;
}

.archive-controls {
  display: grid;
  grid-template-columns: 1.6fr 1fr .8fr auto;
  gap: 12px;
  align-items: end;
}

.image-toggle {
  min-height: 42px;
  padding: 0 11px;
  border: 1px solid var(--line);
  background: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
}

.image-toggle input {
  min-height: auto;
  width: 16px;
  height: 16px;
  margin: 0;
}

.archive-note {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 12px;
  margin-top: 12px;
  padding: 10px 12px;
  background: #f4f7f9;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.6;
}

.archive-note strong {
  color: var(--ink);
}

.archive-result-meta {
  margin-top: 18px;
  color: var(--muted);
  font-size: 12px;
}

.archive-article-list {
  margin-top: 9px;
  border-top: 1px solid var(--line);
}

.archive-article {
  display: grid;
  grid-template-columns: minmax(190px, 250px) 1fr;
  gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.archive-cover {
  position: relative;
  min-height: 168px;
  background: #edf2f4;
  overflow: hidden;
}

.archive-cover > a,
.archive-cover img {
  display: block;
  width: 100%;
  height: 100%;
}

.archive-cover img {
  position: absolute;
  inset: 0;
  object-fit: contain;
  background: #eef2f4;
}

.archive-cover > span {
  position: absolute;
  left: 7px;
  bottom: 7px;
  padding: 4px 6px;
  background: rgba(23, 32, 38, .78);
  color: #fff;
  font-size: 9px;
}

.archive-placeholder {
  min-height: 168px;
  display: grid;
  place-content: center;
  gap: 12px;
  color: #84919a;
  font: 700 10px/1 Arial, sans-serif;
  letter-spacing: .08em;
  text-align: center;
}

.archive-placeholder i {
  width: 58px;
  height: 42px;
  border: 3px solid #a9b5bc;
  position: relative;
}

.archive-placeholder i::after {
  content: "";
  position: absolute;
  left: 13px;
  top: 12px;
  width: 26px;
  height: 14px;
  background: #a9b5bc;
}

.archive-article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.archive-article-meta time,
.archive-article-meta span {
  color: var(--muted);
  font-size: 10px;
}

.archive-article-meta span {
  padding: 3px 5px;
  border: 1px solid var(--line);
}

.archive-article-main h3 {
  margin: 8px 0;
  font-size: 18px;
  line-height: 1.45;
}

.archive-article-main h3 a {
  color: var(--ink);
  text-decoration: none;
}

.archive-article-main h3 a:hover {
  color: #1557b0;
}

.archive-brief {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.7;
}

.archive-components {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  align-items: center;
  margin-top: 10px;
}

.archive-components strong {
  margin-right: 3px;
  color: var(--ink);
  font-size: 10px;
}

.archive-components span {
  padding: 3px 5px;
  background: #edf6f4;
  color: #1f5e60;
  font-size: 10px;
}

.archive-article details {
  margin-top: 11px;
  border-top: 1px dashed var(--line);
}

.archive-article summary {
  padding: 10px 0 0;
  color: #1557b0;
  font-size: 11px;
  cursor: pointer;
}

.archive-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 10px;
}

.archive-detail-grid > div {
  padding: 10px;
  background: #f6f8f9;
}

.archive-detail-grid strong {
  color: var(--teal);
  font-size: 10px;
}

.archive-detail-grid p {
  margin: 5px 0 0;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.65;
}

.archive-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 9px;
  margin-top: 10px;
}

.archive-gallery figure {
  margin: 0;
  border: 1px solid var(--line);
}

.archive-gallery img {
  display: block;
  width: 100%;
  height: 180px;
  object-fit: contain;
  background: #eef2f4;
}

.archive-gallery figcaption {
  padding: 6px 8px;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.45;
}

.archive-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 10px;
}

.archive-links a {
  color: #1557b0;
  font-size: 11px;
}

.archive-pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 13px;
  padding-top: 17px;
}

.archive-pagination button {
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font: 18px/1 Arial, sans-serif;
  cursor: pointer;
}

.archive-pagination button:disabled {
  color: #b5bec4;
  cursor: default;
}

.archive-pagination span {
  min-width: 90px;
  color: var(--muted);
  font-size: 11px;
  text-align: center;
}

.wechat-scope {
  display: grid;
  grid-template-columns: 150px 1fr;
  align-items: center;
  gap: 20px;
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.wechat-scope div {
  display: flex;
  align-items: baseline;
  gap: 7px;
}

.wechat-scope strong {
  color: var(--teal);
  font: 700 32px/1 Arial, sans-serif;
}

.wechat-scope span {
  color: var(--muted);
  font-size: 13px;
}

.wechat-scope p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}

.wechat-insights {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  margin: 18px 0;
  border: 1px solid var(--line);
}

.wechat-insights article {
  min-width: 0;
  padding: 13px;
  border-right: 1px solid var(--line);
}

.wechat-insights article:last-child {
  border-right: 0;
}

.wechat-insights span {
  color: var(--teal);
  font: 700 11px/1 Arial, sans-serif;
}

.wechat-insights h3 {
  margin: 9px 0 7px;
  font-size: 15px;
}

.wechat-insights p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

.article-controls {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 12px;
  margin: 18px 0 12px;
}

.article-list {
  border-top: 1px solid var(--line);
}

.article-row {
  display: grid;
  grid-template-columns: 150px 1fr 36px;
  gap: 18px;
  padding: 17px 4px;
  border-bottom: 1px solid var(--line);
}

.article-row:hover {
  background: #f8fafb;
}

.article-meta {
  display: flex;
  align-content: start;
  flex-wrap: wrap;
  gap: 6px;
}

.article-meta time {
  width: 100%;
  color: var(--ink);
  font: 700 12px/1.4 Consolas, monospace;
}

.article-meta span,
.article-tags span {
  padding: 4px 6px;
  border: 1px solid #d4e5e2;
  background: #eef5f4;
  color: #1f5e60;
  font-size: 10px;
}

.article-body h3 {
  margin: 0 0 7px;
  font-size: 16px;
  line-height: 1.4;
}

.article-body h3 a {
  color: var(--ink);
  text-decoration: none;
}

.article-body h3 a:hover {
  color: #1557b0;
}

.article-body p {
  margin: 0 0 9px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
}

.article-takeaway {
  padding: 8px 10px;
  border-left: 3px solid var(--gold);
  background: #faf7f0;
  color: #4f4a3f;
  font-size: 12px;
  line-height: 1.55;
}

.article-takeaway strong {
  margin-right: 8px;
  color: var(--gold);
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 9px;
}

.article-open {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--line);
  color: #1557b0;
  text-decoration: none;
}

.article-empty {
  padding: 28px;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 900px) {
  .topbar,
  .overview,
  .controls {
    grid-template-columns: 1fr;
  }

  .summary {
    justify-items: start;
  }

  .tree {
    grid-template-columns: 1fr 1fr;
  }

  .wechat-insights {
    grid-template-columns: 1fr 1fr;
  }

  .wechat-insights article {
    border-bottom: 1px solid var(--line);
  }

  .article-row {
    grid-template-columns: 120px 1fr 36px;
  }

  .archive-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .archive-stats p {
    grid-column: 1 / -1;
    text-align: left;
  }

  .archive-category-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .archive-controls {
    grid-template-columns: 1fr 1fr;
  }

  .resonant-definition {
    grid-template-columns: 1fr;
  }

  .resonant-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .resonant-stats p {
    grid-column: 1 / -1;
    text-align: left;
  }

  .resonant-family-strip {
    grid-template-columns: repeat(3, 1fr);
  }

  .resonant-controls {
    grid-template-columns: 1fr 1fr;
  }

  .mechanism-summary {
    grid-template-columns: repeat(3, 1fr);
  }

  .mechanism-summary p {
    grid-column: 1 / -1;
    text-align: left;
  }

  .mechanism-share-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .tree,
  .card-head,
  .section-title {
    grid-template-columns: 1fr;
    display: grid;
  }

  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .principle-signal {
    font-size: 10px;
  }

  .wechat-scope,
  .article-controls,
  .article-row,
  .wechat-insights,
  .archive-stats,
  .archive-controls,
  .archive-article,
  .archive-detail-grid,
  .archive-gallery,
  .mechanism-method,
  .mechanism-summary,
  .mechanism-article-controls,
  .mechanism-article,
  .resonant-definition,
  .resonant-stats,
  .resonant-controls,
  .resonant-article {
    grid-template-columns: 1fr;
  }

  .wechat-insights article {
    border-right: 0;
  }

  .article-open {
    display: none;
  }

  .archive-stats p {
    grid-column: auto;
  }

  .archive-category-strip {
    grid-template-columns: 1fr;
  }

  .archive-cover {
    min-height: 210px;
  }

  .mechanism-summary p {
    grid-column: auto;
  }

  .mechanism-share-layout {
    gap: 18px;
  }

  .mechanism-share-row {
    grid-template-columns: 9px 72px minmax(64px, 1fr) 34px 43px;
    gap: 6px;
    padding-inline: 2px;
  }

  .mechanism-ring {
    width: 152px;
    height: 152px;
  }

  .mechanism-ring > div {
    width: 92px;
    height: 92px;
  }

  .resonant-model {
    grid-template-columns: 1fr;
  }

  .resonant-model b {
    transform: rotate(90deg);
    text-align: center;
  }

  .resonant-stats p {
    grid-column: auto;
  }

  .resonant-family-strip {
    grid-template-columns: 1fr 1fr;
  }
}