:root {
  --reference-copy-width: 820px;
  --reference-hero-min: 610px;
  --reference-diagram-size: 460px;
  --reference-diagram-core: 126px;
  --reference-line: 2px;
  --reference-section-gap: clamp(76px, 9vw, 124px);
  --reference-text-gap: 18px;
  --reference-card-gap: 18px;
  --reference-label-shadow: var(--shadow-lift);
}

.reference-hero {
  min-height: var(--reference-hero-min);
  display: flex;
  align-items: center;
  overflow: hidden;
  border-bottom: 1px solid var(--color-line);
  background:
    linear-gradient(var(--color-canvas), var(--color-canvas)) padding-box,
    radial-gradient(circle at right center, var(--color-panel-strong), var(--color-canvas)) border-box;
}

.reference-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(360px, 0.88fr);
  gap: clamp(36px, 6vw, 86px);
  align-items: center;
  padding-top: clamp(70px, 8vw, 110px);
  padding-bottom: clamp(70px, 8vw, 110px);
}

.reference-hero-copy {
  position: relative;
  z-index: 2;
}

.reference-hero-copy h1 {
  max-width: 760px;
}

.reference-hero-copy .lead {
  margin-bottom: 30px;
}

.reference-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 28px 0 0;
  padding: 0;
  color: var(--color-ink-muted);
  font-size: 13px;
  font-weight: 750;
  list-style: none;
}

.reference-facts li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.reference-diagram {
  width: min(100%, var(--reference-diagram-size));
  aspect-ratio: 1;
  position: relative;
  margin-inline: auto;
  border-radius: 50%;
  background-color: var(--color-panel);
  background-image: radial-gradient(var(--color-line) 1px, transparent 1px);
  background-size: 18px 18px;
}

.diagram-core {
  width: var(--reference-diagram-core);
  height: var(--reference-diagram-core);
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 3;
  display: grid;
  place-content: center;
  border: 1px solid var(--color-accent);
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-coral));
  box-shadow: var(--shadow-cta);
  color: var(--color-white);
  text-align: center;
  transform: translate(-50%, -50%);
}

.diagram-core span {
  font-family: var(--font-display);
  font-size: 42px;
  font-weight: 900;
  line-height: 1;
}

.diagram-core small {
  margin-top: 7px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.diagram-ring {
  position: absolute;
  border: var(--reference-line) solid var(--color-line);
  border-radius: 50%;
}

.diagram-ring::before,
.diagram-ring::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 18px var(--color-accent-shadow);
}

.diagram-ring-outer {
  inset: 10%;
}

.diagram-ring-outer::before {
  width: 12px;
  height: 12px;
  top: 12%;
  right: 18%;
}

.diagram-ring-outer::after {
  width: 9px;
  height: 9px;
  bottom: 18%;
  left: 8%;
  background: var(--color-sky);
}

.diagram-ring-inner {
  inset: 27%;
  border-color: var(--color-success);
}

.diagram-ring-inner::before {
  width: 9px;
  height: 9px;
  right: -5px;
  bottom: 28%;
  background: var(--color-success);
}

.diagram-ring-inner::after {
  width: 8px;
  height: 8px;
  top: -4px;
  left: 32%;
  background: var(--color-warning);
}

.diagram-label {
  position: absolute;
  z-index: 4;
  padding: 8px 13px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-canvas);
  box-shadow: var(--reference-label-shadow);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  white-space: nowrap;
}

.diagram-label-ss {
  top: 8%;
  left: 4%;
}

.diagram-label-vmess {
  top: 13%;
  right: 2%;
}

.diagram-label-trojan {
  top: 46%;
  right: -4%;
}

.diagram-label-vless {
  right: 6%;
  bottom: 8%;
}

.diagram-label-hysteria {
  bottom: 7%;
  left: 2%;
}

.diagram-label-tuic {
  top: 44%;
  left: -2%;
}

.reference-intro {
  padding-top: clamp(54px, 7vw, 88px);
  padding-bottom: clamp(54px, 7vw, 88px);
}

.reference-intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(34px, 7vw, 96px);
  align-items: start;
}

.reference-intro h2 {
  margin-top: 18px;
  font-size: clamp(34px, 4vw, 50px);
}

.reference-intro p {
  color: var(--color-ink-muted);
  font-size: 17px;
}

.text-link {
  color: var(--color-accent-deep);
  font-weight: 800;
  text-decoration: underline;
  text-decoration-color: var(--color-focus-halo);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.text-link:hover {
  color: var(--color-accent);
}

.reference-article {
  padding-top: clamp(58px, 8vw, 96px);
  padding-bottom: var(--section-space);
}

.reference-article .toc-tabs {
  max-width: 100%;
}

.reference-section {
  position: relative;
  max-width: var(--reference-copy-width);
  margin-inline: auto;
  padding-top: var(--reference-section-gap);
}

.reference-section:first-of-type {
  padding-top: 20px;
}

.reference-section + .reference-section {
  border-top: 1px solid var(--color-line);
}

.reference-section h2 {
  margin-bottom: 22px;
}

.reference-section h3 {
  margin-top: 42px;
  font-size: clamp(22px, 2.5vw, 29px);
}

.reference-section p,
.reference-section li {
  color: var(--color-ink-muted);
}

.reference-section p {
  margin-bottom: var(--reference-text-gap);
  font-size: 17px;
  line-height: 1.85;
}

.reference-section .section-lead {
  margin-bottom: 34px;
  color: var(--color-ink);
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 650;
  line-height: 1.75;
}

.section-marker {
  margin-bottom: 18px;
}

.section-marker span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-accent-deep);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.section-marker span::before {
  content: "";
  width: 28px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--color-accent), var(--color-coral));
}

.reference-section .callout {
  margin-top: 34px;
  margin-bottom: 34px;
  font-size: 16px;
  line-height: 1.8;
}

.reference-section pre {
  margin-top: 28px;
  margin-bottom: 28px;
  font-size: 14px;
  line-height: 1.75;
}

.reference-section code {
  font-size: 0.94em;
}

.reference-section p code {
  padding: 2px 6px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-xs);
  background: var(--color-panel);
  color: var(--color-accent-deep);
}

.reference-section .table-scroll {
  margin-top: 34px;
  margin-bottom: 34px;
}

.reference-section .data-table,
.reference-section .compare-table {
  line-height: 1.6;
}

.scenario-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--reference-card-gap);
  margin-top: 38px;
}

.scenario-card {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-card);
  background: var(--color-panel);
}

.scenario-card h3 {
  margin-top: 20px;
  margin-bottom: 10px;
  font-size: 20px;
}

.scenario-card p {
  margin-bottom: 0;
  font-size: 15px;
  line-height: 1.7;
}

.reference-end {
  padding-top: clamp(70px, 8vw, 104px);
  padding-bottom: clamp(70px, 8vw, 104px);
}

.reference-end-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 36px;
  align-items: center;
}

.reference-end h2 {
  margin-top: 22px;
  margin-bottom: 14px;
}

.reference-end p {
  max-width: 680px;
  margin-bottom: 0;
  color: var(--color-night-text);
  font-size: 18px;
}

.reference-night-link {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border: 1px solid var(--color-night-line);
  border-radius: var(--radius-pill);
  background: var(--color-night);
  color: var(--color-white);
  font-weight: 800;
  line-height: 1.2;
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.reference-night-link:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

@media (max-width: 980px) {
  .reference-hero-grid {
    grid-template-columns: 1fr;
  }

  .reference-hero-copy {
    max-width: 780px;
  }

  .reference-diagram {
    width: min(100%, 520px);
  }
}

@media (max-width: 820px) {
  .reference-intro-grid,
  .reference-end-grid {
    grid-template-columns: 1fr;
  }

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

  .reference-end .button-row {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .reference-hero {
    min-height: auto;
  }

  .reference-hero-grid {
    gap: 42px;
    padding-top: 58px;
    padding-bottom: 64px;
  }

  .reference-hero-copy .lead {
    font-size: 17px;
  }

  .reference-facts {
    display: grid;
    gap: 10px;
  }

  .reference-diagram {
    width: min(88vw, 390px);
  }

  .diagram-core {
    width: 104px;
    height: 104px;
  }

  .diagram-core span {
    font-size: 34px;
  }

  .diagram-label {
    padding: 7px 10px;
    font-size: 9px;
  }

  .diagram-label-trojan,
  .diagram-label-tuic {
    display: none;
  }

  .reference-article {
    padding-top: 48px;
  }

  .reference-section {
    padding-top: 76px;
  }

  .reference-section p {
    font-size: 16px;
    line-height: 1.8;
  }

  .reference-section h3 {
    margin-top: 34px;
  }

  .reference-section .table-scroll {
    margin-inline: 0;
  }

  .reference-end .button-row {
    display: grid;
  }
}

@media (prefers-reduced-motion: reduce) {
  .reference-night-link {
    transform: none;
  }
}