/* 第2套·www 子域 · 建筑蓝图 / Blueprint：深蓝底 + 青线图框 */
:root {
  --bp-navy: #0b1f33;
  --bp-navy-mid: #123049;
  --bp-navy-deep: #071624;
  --bp-cyan: #3ec1d3;
  --bp-cyan-soft: #8fe4ee;
  --bp-ink: #d8eef3;
  --bp-muted: #9ab8c4;
  --bp-line: #3ec1d3;
  --bp-ok: #7ee0c4;
  --bp-warn: #e8c36a;
  --bp-max: 1080px;
  --bp-sans: "Segoe UI", "Microsoft YaHei", "微软雅黑", sans-serif;
  --bp-mono: Consolas, "Segoe UI Mono", "Courier New", monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  color: var(--bp-ink);
  background-color: var(--bp-navy);
  background-image:
    linear-gradient(rgba(62, 193, 211, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(62, 193, 211, 0.12) 1px, transparent 1px),
    linear-gradient(rgba(62, 193, 211, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(62, 193, 211, 0.05) 1px, transparent 1px);
  background-size: 24px 24px, 24px 24px, 120px 120px, 120px 120px;
  background-attachment: fixed;
  font-family: var(--bp-sans);
  font-size: 16.5px;
  line-height: 1.8;
  padding-bottom: 7.5rem;
}

img,
svg {
  max-width: 100%;
  display: inline-block;
  vertical-align: middle;
}

a {
  color: var(--bp-cyan);
  text-underline-offset: 0.16em;
}

a:hover {
  color: var(--bp-cyan-soft);
}

p {
  margin: 0 0 0.95rem;
}

h1,
h2,
h3 {
  color: #eef9fb;
  line-height: 1.35;
  font-weight: 700;
}

h1 {
  margin: 0 0 0.85rem;
  font-size: clamp(1.42rem, 2.7vw, 2rem);
}

h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.1rem, 2vw, 1.38rem);
}

h3 {
  margin: 0 0 0.4rem;
  font-size: 1.04rem;
}

ul,
ol {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
}

li + li {
  margin-top: 0.3rem;
}

table {
  width: 100%;
  border-collapse: collapse;
}

:focus-visible {
  outline: 2px solid var(--bp-cyan);
  outline-offset: 3px;
}

.bp-skip {
  position: absolute;
  left: -9999px;
  top: 8px;
}

.bp-skip:focus {
  left: 12px;
  z-index: 80;
  background: var(--bp-navy-deep);
  color: var(--bp-cyan);
  border: 1px solid var(--bp-cyan);
  padding: 8px 12px;
  text-decoration: none;
}

.bp-head {
  background: var(--bp-navy-deep);
  border-bottom: 2px solid var(--bp-line);
}

.bp-head__inner {
  width: min(var(--bp-max), calc(100% - 2rem));
  margin: 0 auto;
  min-height: 66px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.bp-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  color: #eef9fb;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.bp-brand svg {
  width: 28px;
  height: 28px;
  color: var(--bp-cyan);
  border: 1px solid var(--bp-cyan);
  padding: 3px;
}

.bp-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem;
}

.bp-nav a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--bp-ink);
  text-decoration: none;
  padding: 0.42rem 0.8rem;
  border: 1px solid transparent;
  font-size: 0.92rem;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.bp-nav a svg {
  width: 14px;
  height: 14px;
}

.bp-nav a:hover {
  border-color: var(--bp-cyan);
  color: var(--bp-cyan-soft);
}

.bp-nav a.is-current,
.bp-nav a[aria-current="page"] {
  background: var(--bp-cyan);
  color: var(--bp-navy);
  border-color: var(--bp-cyan);
}

.bp-wrap {
  width: min(var(--bp-max), calc(100% - 2rem));
  margin: 1.15rem auto 2rem;
  padding: 0.7rem;
  border: 2px solid var(--bp-line);
  box-shadow: 0 0 0 6px var(--bp-navy), 0 0 0 7px rgba(62, 193, 211, 0.35);
}

.bp-hero,
.bp-sec {
  margin: 0 0 0.85rem;
  padding: 1.15rem 1.2rem 1.2rem;
  border: 1px solid var(--bp-line);
  background: var(--bp-navy-mid);
}

.bp-sec:last-child {
  margin-bottom: 0;
}

.bp-kicker {
  margin: 0 0 0.5rem;
  font-family: var(--bp-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--bp-cyan);
}

.bp-lead {
  font-size: 1.02rem;
}

.bp-dwg {
  display: inline-block;
  margin-right: 0.4rem;
  padding: 0.02rem 0.38rem;
  border: 1px solid var(--bp-cyan);
  font-family: var(--bp-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--bp-cyan);
  vertical-align: middle;
}

.bp-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1rem 0 0.2rem;
}

.bp-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  padding: 0.5rem 0.92rem;
  border: 1px solid var(--bp-cyan);
  background: transparent;
  color: var(--bp-cyan);
  text-decoration: none;
  font-weight: 700;
  transition: background-color 0.18s ease, color 0.18s ease;
}

.bp-btn:hover {
  background: var(--bp-cyan);
  color: var(--bp-navy);
  text-decoration: none;
}

.bp-btn svg {
  width: 16px;
  height: 16px;
}

.bp-btn--ghost {
  border-style: dashed;
}

.js-dl .btn-label {
  display: inline-block;
}

.bp-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0.75rem 0 0.2rem;
}

.bp-grid--4 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.bp-card {
  border: 1px solid var(--bp-line);
  padding: 0.85rem 0.9rem 0.65rem;
  background: var(--bp-navy-deep);
}

.bp-card h3 {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.bp-card svg {
  width: 20px;
  height: 20px;
  color: var(--bp-cyan);
  flex: 0 0 auto;
}

.bp-table-wrap {
  overflow-x: auto;
  margin: 0.7rem 0 1rem;
  border: 1px solid var(--bp-line);
}

.bp-table th,
.bp-table td {
  padding: 0.48rem 0.62rem;
  border: 1px solid var(--bp-line);
  text-align: left;
  vertical-align: top;
}

.bp-table th {
  background: var(--bp-navy-deep);
  color: var(--bp-cyan);
  font-size: 0.86rem;
  font-family: var(--bp-mono);
}

.bp-steps {
  margin: 0.35rem 0 0.85rem;
  padding: 0;
  list-style: none;
  counter-reset: bpstep;
}

.bp-steps li {
  position: relative;
  padding: 0.5rem 0 0.5rem 2.5rem;
  border-bottom: 1px dashed var(--bp-line);
  counter-increment: bpstep;
}

.bp-steps li::before {
  content: counter(bpstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.55rem;
  font-family: var(--bp-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--bp-cyan);
}

.bp-review {
  border: 1px solid var(--bp-line);
  padding: 0.8rem 0.9rem 0.55rem;
  margin: 0 0 0.7rem;
  background: var(--bp-navy-deep);
}

.bp-who {
  font-family: var(--bp-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--bp-cyan);
}

.bp-faq {
  margin: 0;
}

.bp-faq > div {
  margin: 0 0 0.85rem;
  padding: 0 0 0.85rem;
  border-bottom: 1px dashed var(--bp-line);
}

.bp-faq > div:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.bp-q {
  margin: 0 0 0.35rem;
  color: #eef9fb;
  font-weight: 700;
}

.bp-faq dd {
  margin: 0;
}

.bp-cta {
  margin-top: 0.85rem;
  padding: 1rem 1.05rem;
  border: 2px solid var(--bp-cyan);
  background: var(--bp-navy-deep);
  text-align: center;
}

.bp-cta p {
  margin-bottom: 0.75rem;
}

.bp-titleblock {
  position: fixed;
  right: 14px;
  bottom: 14px;
  z-index: 40;
  width: 232px;
  border: 1px solid var(--bp-cyan);
  background: var(--bp-navy-deep);
  color: var(--bp-ink);
}

.bp-titleblock__bar {
  padding: 0.32rem 0.6rem;
  border-bottom: 1px solid var(--bp-cyan);
  font-family: var(--bp-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--bp-cyan);
}

.bp-titleblock dl {
  margin: 0;
}

.bp-titleblock div {
  display: grid;
  grid-template-columns: 3.4rem 1fr;
  border-bottom: 1px solid rgba(62, 193, 211, 0.28);
}

.bp-titleblock div:last-child {
  border-bottom: 0;
}

.bp-titleblock dt,
.bp-titleblock dd {
  margin: 0;
  padding: 0.32rem 0.55rem;
  font-size: 0.8rem;
}

.bp-titleblock dt {
  font-family: var(--bp-mono);
  color: var(--bp-cyan);
}

.bp-foot {
  background: var(--bp-navy-deep);
  border-top: 2px solid var(--bp-line);
  padding: 1.05rem 0 1.25rem;
}

.bp-foot__inner {
  width: min(var(--bp-max), calc(100% - 2rem));
  margin: 0 auto;
}

.bp-foot p {
  margin: 0 0 0.4rem;
}

.bp-foot p:last-child {
  margin-bottom: 0;
  color: var(--bp-muted);
  font-size: 0.9rem;
}

.bp-safe {
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--bp-ok);
  color: var(--bp-ok);
  font-weight: 700;
}

@media (max-width: 860px) {
  .bp-grid,
  .bp-grid--4 {
    grid-template-columns: 1fr;
  }

  .bp-head__inner {
    flex-wrap: wrap;
    padding: 0.5rem 0;
  }

  body {
    padding-bottom: 1.2rem;
  }

  .bp-titleblock {
    position: static;
    width: min(var(--bp-max), calc(100% - 2rem));
    margin: 0 auto 1rem;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 16px;
  }

  .bp-wrap {
    padding: 0.45rem;
  }

  .bp-hero,
  .bp-sec {
    padding: 0.9rem 0.75rem 1rem;
  }

  .bp-nav a {
    padding: 0.32rem 0.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .bp-nav a,
  .bp-btn {
    transition: none;
  }
}

@media print {
  body {
    background: #fff;
    color: #111;
    padding-bottom: 0;
  }

  .bp-titleblock {
    position: static;
  }
}