.dns-page { padding-bottom: 110px; }

.dns-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(390px, 0.82fr);
  gap: clamp(48px, 8vw, 112px);
  align-items: center;
  padding: clamp(64px, 9vw, 112px) 0 90px;
}

.dns-hero h1 { max-width: 680px; }

.back-link {
  display: inline-block;
  margin-top: 30px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  text-underline-offset: 5px;
}

.back-link:focus-visible { outline: 3px solid var(--signal); outline-offset: 5px; }

.query-ticket {
  position: relative;
  overflow: hidden;
  padding: 28px;
  background: var(--night);
  color: #eaf8f7;
  box-shadow: 16px 16px 0 rgba(21, 95, 155, 0.14);
}

.query-ticket::after {
  content: "DNS";
  position: absolute;
  right: -12px;
  bottom: -28px;
  color: rgba(28, 169, 161, 0.09);
  font: 700 108px/1 Consolas, monospace;
}

.ticket-heading {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(234, 248, 247, 0.18);
  font-size: 13px;
  font-weight: 700;
}

.ticket-heading span:last-child { color: #9ec0c4; font: 11px/1.4 Consolas, monospace; }
.ticket-heading i { display: inline-block; width: 7px; height: 7px; margin-right: 5px; border-radius: 50%; background: var(--aqua); }
.query-ticket dl { position: relative; z-index: 1; margin: 0; }
.query-ticket dl div { padding: 20px 0; border-bottom: 1px solid rgba(234, 248, 247, 0.14); }
.query-ticket dt { margin-bottom: 8px; color: #91aeb2; font-size: 11px; }
.query-ticket dd { margin: 0; }
.query-ticket code { font: 600 13px/1.6 Consolas, monospace; overflow-wrap: anywhere; }
.query-ticket > p { position: relative; z-index: 1; margin: 20px 0 0; color: #86a4a8; font-size: 11px; line-height: 1.6; }

.dns-definition {
  display: grid;
  grid-template-columns: 110px minmax(0, 0.9fr) minmax(360px, 1.1fr);
  gap: 38px;
  align-items: start;
  padding: 58px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.definition-number { color: var(--signal); font: 700 48px/1 Consolas, monospace; }
.dns-definition h2, .lookup-section h2, .records-section h2 { margin: 0; font-family: "STZhongsong", "SimSun", serif; letter-spacing: -0.045em; }
.dns-definition h2 { font-size: clamp(32px, 4vw, 50px); line-height: 1.22; }

.responsibility-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.responsibility-grid article { min-height: 180px; padding: 22px; border: 1px solid var(--line); background: rgba(248, 252, 251, 0.68); }
.responsibility-grid span { color: var(--blue); font-size: 12px; font-weight: 800; }
.responsibility-grid p { margin: 28px 0 0; color: var(--muted); font-size: 14px; line-height: 1.75; }

.lookup-section, .records-section { padding-top: 84px; }
.lookup-section h2, .records-section h2 { font-size: clamp(30px, 4vw, 48px); }

.lookup-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.lookup-flow li { display: flex; min-height: 320px; flex-direction: column; padding: 22px; border: 1px solid var(--line); background: rgba(248, 252, 251, 0.72); }
.lookup-flow b { display: grid; width: 34px; height: 34px; place-items: center; border: 1px solid var(--blue); border-radius: 50%; color: var(--blue); font: 500 12px/1 Consolas, monospace; }
.lookup-illustration { display: grid; min-height: 88px; margin: 22px 0 0; place-items: center; }
.lookup-illustration svg { display: block; width: min(100%, 160px); height: 88px; overflow: visible; }
.lookup-copy { margin-top: auto; padding-top: 22px; border-top: 1px solid rgba(185, 205, 208, 0.72); }
.lookup-flow span { font-size: 16px; font-weight: 800; }
.lookup-flow p { margin: 14px 0 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.lookup-flow code { color: var(--blue); font: 600 12px/1.5 Consolas, monospace; }

.lookup-handoff {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  margin-top: 16px;
  padding: 24px 26px;
  border: 1px solid var(--line);
  border-left: 4px solid var(--aqua);
  background: rgba(248, 252, 251, 0.78);
}

.handoff-route { display: flex; align-items: center; gap: 12px; color: var(--blue); font: 700 12px/1.4 Consolas, monospace; }
.handoff-route i { color: var(--signal); font: normal 18px/1 Consolas, monospace; }
.handoff-copy b { display: block; font-size: 14px; }
.handoff-copy p { margin: 8px 0 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.handoff-next { color: var(--signal); font: 700 11px/1.4 Consolas, monospace; letter-spacing: 0.06em; white-space: nowrap; }

.ttl-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(390px, 1.1fr);
  gap: 46px;
  margin-top: 18px;
  padding: 48px;
  background: var(--night);
  color: #eaf8f7;
}

.ttl-section h2 { margin: 0; font-family: "STZhongsong", "SimSun", serif; font-size: clamp(32px, 4vw, 50px); letter-spacing: -0.045em; line-height: 1.2; }
.ttl-section > div:first-child > p:last-child { margin: 24px 0 0; color: #9eb7bb; line-height: 1.8; }
.ttl-section .eyebrow { color: #72d4ce; }

.cache-cycle { display: grid; grid-template-columns: 1fr auto 1fr; gap: 18px; align-items: center; }
.cache-cycle div { min-height: 190px; padding: 22px; border: 1px solid rgba(234, 248, 247, 0.2); }
.cache-cycle span { display: block; color: var(--signal); font: 700 30px/1 Consolas, monospace; }
.cache-cycle b { display: block; margin-top: 46px; font-size: 15px; }
.cache-cycle p { margin: 10px 0 0; color: #9eb7bb; font-size: 12px; }
.cache-cycle > i { color: #72d4ce; font: normal 20px/1 Consolas, monospace; }

.ttl-section aside { grid-column: 1 / -1; display: grid; grid-template-columns: 230px 1fr; gap: 26px; padding-top: 26px; border-top: 1px solid rgba(234, 248, 247, 0.18); }
.ttl-section aside b { color: #72d4ce; font-size: 13px; }
.ttl-section aside p { margin: 0; color: #9eb7bb; font-size: 13px; line-height: 1.7; }

.record-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.record-grid article { min-height: 210px; padding: 24px; border-top: 3px solid var(--blue); background: var(--night); color: #eaf8f7; }
.record-grid code { color: #72d4ce; font: 600 12px/1.4 Consolas, monospace; }
.record-grid h3 { margin: 46px 0 12px; font-family: "STZhongsong", "SimSun", serif; font-size: 25px; }
.record-grid p { margin: 0; color: #9eb7bb; font-size: 13px; line-height: 1.7; }
.record-grid p code { overflow-wrap: anywhere; }

.diagnosis-section { padding-top: 84px; }
.diagnosis-section h2 { margin: 0; font-family: "STZhongsong", "SimSun", serif; font-size: clamp(30px, 4vw, 48px); letter-spacing: -0.045em; }
.diagnosis-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border: 1px solid var(--line); }
.diagnosis-grid article { min-height: 250px; padding: 25px; border-right: 1px solid var(--line); background: rgba(248, 252, 251, 0.72); }
.diagnosis-grid article:last-child { border-right: 0; }
.diagnosis-grid b { color: var(--signal); font: 600 12px/1 Consolas, monospace; }
.diagnosis-grid h3 { margin: 46px 0 14px; font-family: "STZhongsong", "SimSun", serif; font-size: 28px; }
.diagnosis-grid p { min-height: 72px; margin: 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.diagnosis-grid span { display: block; margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--blue); font-size: 12px; font-weight: 700; }

.command-guide {
  margin-top: 18px;
  padding: clamp(28px, 5vw, 48px);
  border: 1px solid var(--line);
  background: rgba(248, 252, 251, 0.72);
}

.command-guide-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.72fr);
  gap: 34px;
  align-items: end;
}

.command-guide-heading h3 { margin: 0; font-family: "STZhongsong", "SimSun", serif; font-size: clamp(28px, 3.6vw, 42px); letter-spacing: -0.045em; line-height: 1.2; }
.command-guide-heading > p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.75; }
.command-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin-top: 34px; }
.command-card { min-width: 0; padding: 26px; background: var(--night); color: #eaf8f7; }
.command-meta { display: flex; justify-content: space-between; gap: 20px; color: #72d4ce; font: 700 11px/1.4 Consolas, monospace; }
.command-meta code { color: #9eb7bb; font: inherit; }
.command-card h4 { margin: 34px 0 16px; font-family: "STZhongsong", "SimSun", serif; font-size: 25px; }
.command-card pre { margin: 0; padding: 17px 18px; overflow-x: auto; border-left: 3px solid var(--signal); background: #071d24; }
.command-card pre code { color: #d8f4f1; font: 600 12px/1.8 Consolas, monospace; white-space: pre; }
.command-card p { margin: 20px 0 0; color: #9eb7bb; font-size: 13px; line-height: 1.75; }
.command-card p strong { color: #eaf8f7; }
.command-card p code { color: #72d4ce; font: 600 12px/1.5 Consolas, monospace; overflow-wrap: anywhere; }
.command-note { margin: 22px 0 0; color: var(--muted); font-size: 12px; line-height: 1.7; }
.command-note strong { color: var(--blue); }

.source-note { display: flex; flex-wrap: wrap; gap: 14px 24px; margin-top: 70px; padding-top: 24px; border-top: 1px solid var(--line); font-size: 12px; }
.source-note span { color: var(--signal); font: 700 11px/1.5 Consolas, monospace; }
.source-note a { color: var(--blue); text-underline-offset: 4px; }
.source-note a:focus-visible { outline: 3px solid var(--signal); outline-offset: 4px; }

@media (max-width: 900px) {
  .dns-hero { grid-template-columns: 1fr; gap: 48px; }
  .query-ticket { width: min(100%, 620px); }
  .dns-definition { grid-template-columns: 76px 1fr; }
  .responsibility-grid { grid-column: 2; }
  .lookup-flow { grid-template-columns: 1fr 1fr; }
  .lookup-flow li:last-child { display: grid; grid-column: 1 / -1; grid-template-columns: 34px minmax(160px, 0.55fr) minmax(0, 1fr); gap: 26px; min-height: auto; align-items: center; }
  .lookup-flow li:last-child b { align-self: start; }
  .lookup-flow li:last-child .lookup-illustration { margin-top: 0; }
  .lookup-flow li:last-child .lookup-copy { margin-top: 0; }
  .lookup-handoff { grid-template-columns: 150px 1fr; }
  .handoff-next { grid-column: 2; }
  .ttl-section { grid-template-columns: 1fr; padding: 38px; }
  .ttl-section aside { grid-column: auto; }
  .record-grid { grid-template-columns: 1fr 1fr; }
  .command-guide-heading { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .dns-page { padding-bottom: 76px; }
  .dns-hero { padding: 52px 0 68px; }
  .query-ticket { padding: 23px; box-shadow: 8px 8px 0 rgba(21, 95, 155, 0.14); }
  .dns-definition { grid-template-columns: 1fr; gap: 26px; padding: 44px 0; }
  .definition-number { font-size: 34px; }
  .responsibility-grid { grid-column: auto; grid-template-columns: 1fr; }
  .lookup-section, .records-section { padding-top: 64px; }
  .lookup-flow, .record-grid, .diagnosis-grid, .command-grid { grid-template-columns: 1fr; }
  .lookup-flow li { min-height: auto; }
  .lookup-illustration { margin-top: 20px; }
  .lookup-copy { margin-top: 22px; }
  .lookup-flow li:last-child { display: flex; grid-column: auto; }
  .lookup-flow li:last-child .lookup-illustration { margin-top: 20px; }
  .lookup-flow li:last-child .lookup-copy { margin-top: 22px; }
  .lookup-handoff { grid-template-columns: 1fr; gap: 18px; padding: 22px; }
  .handoff-next { grid-column: auto; }
  .ttl-section { padding: 26px 22px; }
  .cache-cycle { grid-template-columns: 1fr; }
  .cache-cycle > i { transform: rotate(90deg); justify-self: center; }
  .ttl-section aside { grid-template-columns: 1fr; }
  .record-grid article { min-height: 190px; }
  .diagnosis-section { padding-top: 64px; }
  .diagnosis-grid article { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .diagnosis-grid article:last-child { border-bottom: 0; }
  .diagnosis-grid p { min-height: auto; }
  .command-guide { padding: 26px 22px; }
  .command-card { padding: 22px; }
  .command-card pre code { white-space: pre-wrap; overflow-wrap: anywhere; }
  .source-note { display: grid; }
}