/* 第8套：海军控制台。全宽深底、线框双屏、青描边面板，和其他浅色套不是同一骨架。 */
:root {
  --navy: #0f172a;
  --navy-lift: #1e293b;
  --cyan: #38bdf8;
  --mist: #e2e8f0;
  --dim: #94a3b8;
  --line: #334155;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
}

body.navy-body {
  margin: 0;
  background: var(--navy);
  color: var(--mist);
  font-family: "IBM Plex Sans", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.72;
}

a {
  color: var(--cyan);
}

.top-line {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.7rem 1rem;
  padding: 0.85rem 4vw;
  border-bottom: 1px solid var(--line);
  background: #020617;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--mist);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.wordmark svg {
  width: 26px;
  height: 26px;
  color: var(--cyan);
}

.jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.8rem;
  font-size: 0.88rem;
}

.jump a {
  text-decoration: none;
  color: var(--dim);
}

.jump a:hover,
.jump a:focus {
  color: var(--cyan);
}

.wide-hero {
  padding: 2.4rem 4vw 2rem;
  background:
    linear-gradient(180deg, #020617 0%, var(--navy) 70%),
    repeating-linear-gradient(
      90deg,
      transparent 0 22px,
      rgba(56, 189, 248, 0.05) 22px 23px
    );
  border-bottom: 1px solid var(--line);
}

.wide-hero h1 {
  margin: 0 0 0.85rem;
  color: #f8fafc;
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  font-weight: 650;
  max-width: 18em;
}

.wide-hero p {
  margin: 0 0 0.65rem;
  color: var(--dim);
  max-width: 46rem;
}

.speed-block,
.op-block,
.find-block,
.seq-block,
.desk-block,
.habit-block,
.faq-block {
  padding: 1.5rem 4vw 1.8rem;
}

.limit-band {
  margin: 0.4rem 4vw 0.6rem;
  padding: 1.2rem 1.3rem;
  border-left: 4px solid var(--cyan);
  background: var(--navy-lift);
}

.speed-block h2,
.op-block h2,
.find-block h2,
.seq-block h2,
.desk-block h2,
.habit-block h2,
.faq-block h2,
.limit-band h2 {
  margin: 0 0 0.7rem;
  color: #f1f5f9;
  font-size: 1.28rem;
  font-weight: 650;
}

.blurb {
  margin: 0 0 1rem;
  color: var(--dim);
  max-width: 50rem;
}

.speed-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.speed-card,
.find-col,
.habit-card {
  background: var(--navy-lift);
  border: 1px solid var(--line);
  padding: 1rem 1.05rem;
}

.speed-card svg,
.habit-card svg {
  width: 34px;
  height: 34px;
  color: var(--cyan);
}

.speed-card h3,
.find-col h3,
.habit-card h3,
.seq-item strong {
  margin: 0.45rem 0 0.4rem;
  color: #f8fafc;
  font-size: 1.02rem;
}

.speed-card p,
.find-col p,
.habit-card p,
.seq-item p,
.limit-band p,
.monitor p {
  margin: 0 0 0.5rem;
  color: var(--dim);
}

.op-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
}

.op-table th,
.op-table td {
  border: 1px solid var(--line);
  padding: 0.65rem 0.7rem;
  text-align: left;
  vertical-align: top;
}

.op-table thead th {
  background: #020617;
  color: var(--cyan);
}

.op-table tbody tr:nth-child(odd) td {
  background: #111827;
}

.find-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.9rem;
}

.seq-bar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.6rem;
  counter-reset: seq;
}

.seq-item {
  background: #020617;
  border-top: 2px solid var(--cyan);
  padding: 0.85rem;
}

.seq-item::before {
  counter-increment: seq;
  content: "0" counter(seq);
  display: block;
  color: var(--cyan);
  font-weight: 700;
  letter-spacing: 0.08em;
  margin-bottom: 0.3rem;
}

.desk-wire {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  align-items: flex-end;
  justify-content: center;
  padding: 1rem 0 0.4rem;
}

.monitor {
  flex: 1 1 240px;
  max-width: 420px;
  border: 2px solid var(--cyan);
  background: #020617;
  padding: 0.55rem;
}

.monitor .bezel {
  min-height: 150px;
  border: 1px dashed #64748b;
  padding: 0.7rem;
}

.monitor h3 {
  margin: 0 0 0.4rem;
  color: var(--cyan);
  font-size: 0.95rem;
}

.monitor-a {
  transform: none;
}

.monitor-b {
  min-height: 190px;
}

.stand {
  width: 36%;
  height: 14px;
  margin: 0 auto;
  background: #334155;
}

.habit-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
}

.faq-dark details {
  border: 1px solid var(--line);
  background: var(--navy-lift);
  margin-bottom: 0.55rem;
  padding: 0.55rem 0.85rem;
}

.faq-dark summary {
  cursor: pointer;
  color: #f8fafc;
  font-weight: 650;
}

.faq-dark p {
  color: var(--dim);
  margin: 0.5rem 0 0.35rem;
}

.foot-navy {
  background: #020617;
  color: var(--dim);
  padding: 1.4rem 4vw 1.7rem;
  border-top: 1px solid var(--line);
  font-size: 0.92rem;
}

.foot-navy p {
  margin: 0 0 0.45rem;
  max-width: 48rem;
}

.foot-navy p:last-child {
  margin-top: 0.8rem;
  color: #64748b;
}

@media (max-width: 900px) {
  .speed-row,
  .find-pair,
  .seq-bar,
  .habit-grid {
    grid-template-columns: 1fr;
  }
}