/* 第5套 web · 深色工具站 */
:root {
  --dk-bg: #07090d;
  --dk-bg-2: #0b1017;
  --dk-panel: #121822;
  --dk-panel-2: #171f2b;
  --dk-inset: #0e141c;
  --dk-line: #263140;
  --dk-line-2: #354557;
  --dk-text: #e8eef6;
  --dk-mute: #8b97a8;
  --dk-dim: #5d6b7c;
  --dk-accent: #2ee6a6;
  --dk-accent-2: #1bb888;
  --dk-accent-ink: #042117;
  --dk-blue: #6b93ff;
  --dk-amber: #f5c14a;
  --dk-red: #ff6b7a;
  --dk-sans: "Segoe UI", "Microsoft YaHei UI", "Microsoft YaHei", "PingFang SC", "Noto Sans SC", sans-serif;
  --dk-mono: "Cascadia Mono", Consolas, "Microsoft YaHei Mono", monospace;
  --dk-top: 62px;
  --dk-shadow: 0 12px 40px rgba(0, 0, 0, 0.38);
  --dk-radius: 10px;
}

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

html {
  scroll-behavior: auto;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  padding-top: var(--dk-top);
  color: var(--dk-text);
  background-color: var(--dk-bg);
  background-image:
    linear-gradient(180deg, rgba(46, 230, 166, 0.035), transparent 28%),
    linear-gradient(90deg, rgba(38, 49, 64, 0.35) 1px, transparent 1px),
    linear-gradient(rgba(38, 49, 64, 0.28) 1px, transparent 1px);
  background-size: auto, 28px 28px, 28px 28px;
  background-position: 0 0, 0 0, 0 0;
  font-family: var(--dk-sans);
  font-size: 16.2px;
  line-height: 1.8;
}

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

a {
  color: var(--dk-accent);
  text-underline-offset: 3px;
}

a:hover {
  color: #7ff3c8;
}

p {
  margin: 0 0 1em;
}

p:last-child {
  margin-bottom: 0;
}

h1,
h2,
h3 {
  margin: 0 0 0.7em;
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.01em;
}

h1 {
  font-size: 1.72rem;
}

h2 {
  font-size: 1.28rem;
}

h3 {
  font-size: 1.02rem;
}

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

.dk-skip {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 80;
  padding: 8px 12px;
  background: var(--dk-accent);
  color: var(--dk-accent-ink);
}

.dk-skip:focus {
  left: 12px;
  top: 12px;
}

.dk-topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: var(--dk-top);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 18px;
  background: rgba(7, 9, 13, 0.94);
  border-bottom: 1px solid var(--dk-line);
  backdrop-filter: blur(12px);
}

.dk-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--dk-text);
  text-decoration: none;
  font-weight: 700;
  white-space: nowrap;
}

.dk-brand svg {
  width: 26px;
  height: 26px;
  color: var(--dk-accent);
}

.dk-brand:hover {
  color: var(--dk-accent);
}

.dk-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
}

.dk-nav a {
  color: var(--dk-mute);
  text-decoration: none;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 0.92rem;
}

.dk-nav a:hover,
.dk-nav a.dk-on,
.dk-nav a[aria-current="page"] {
  color: var(--dk-text);
  background: var(--dk-panel);
}

.dk-top-dl {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 38px;
  padding: 0 14px;
  border-radius: 8px;
  background: var(--dk-accent);
  color: var(--dk-accent-ink);
  text-decoration: none;
  font-weight: 700;
  white-space: nowrap;
  box-shadow: 0 0 0 1px rgba(46, 230, 166, 0.25);
}

.dk-top-dl svg {
  width: 16px;
  height: 16px;
}

.dk-top-dl:hover {
  color: var(--dk-accent-ink);
  background: #54f0b8;
}

.dk-wrap {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 48px;
}

.dk-hero,
.dk-block {
  margin-bottom: 22px;
  padding: 22px 24px 24px;
  background: linear-gradient(180deg, var(--dk-panel), var(--dk-panel-2));
  border: 1px solid var(--dk-line);
  border-radius: var(--dk-radius);
  box-shadow: var(--dk-shadow);
}

.dk-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  color: var(--dk-accent);
  font-family: var(--dk-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.dk-kicker i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--dk-accent);
  box-shadow: 0 0 8px var(--dk-accent);
}

.dk-lead {
  font-size: 1.05rem;
  color: #d5deea;
}

.dk-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
}

.dk-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--dk-line-2);
  border-radius: 999px;
  background: var(--dk-inset);
  color: var(--dk-mute);
  font-size: 0.8rem;
  font-family: var(--dk-mono);
}

.dk-chip b {
  color: var(--dk-text);
  font-weight: 600;
}

.dk-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.dk-btn,
.dk-btn-ghost,
.dk-btn-line {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
}

.dk-btn {
  background: var(--dk-accent);
  color: var(--dk-accent-ink);
}

.dk-btn:hover {
  background: #54f0b8;
  color: var(--dk-accent-ink);
}

.dk-btn-ghost {
  background: #1a2a44;
  color: #d7e4ff;
}

.dk-btn-ghost:hover {
  color: #fff;
}

.dk-btn-line {
  border: 1px solid var(--dk-line-2);
  background: transparent;
  color: var(--dk-text);
}

.dk-btn-line:hover {
  border-color: var(--dk-accent);
  color: var(--dk-accent);
}

.dk-btn svg,
.dk-btn-ghost svg,
.dk-btn-line svg {
  width: 16px;
  height: 16px;
}

.dk-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.dk-grid-4 {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.dk-card {
  padding: 16px;
  background: var(--dk-inset);
  border: 1px solid var(--dk-line);
  border-radius: 8px;
}

.dk-card h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.dk-card svg {
  width: 20px;
  height: 20px;
  color: var(--dk-accent);
}

.dk-card p {
  color: var(--dk-mute);
}

.dk-table-wrap {
  overflow-x: auto;
  margin: 12px 0 4px;
  border: 1px solid var(--dk-line);
  border-radius: 8px;
}

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

th,
td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--dk-line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #101820;
  color: var(--dk-mute);
  font-weight: 600;
}

tr:last-child td {
  border-bottom: 0;
}

td strong {
  color: var(--dk-accent);
}

.dk-steps {
  counter-reset: dkstep;
  list-style: none;
  padding: 0;
}

.dk-steps li {
  position: relative;
  margin-bottom: 12px;
  padding: 12px 14px 12px 52px;
  background: var(--dk-inset);
  border: 1px solid var(--dk-line);
  border-radius: 8px;
}

.dk-steps li::before {
  counter-increment: dkstep;
  content: counter(dkstep);
  position: absolute;
  left: 12px;
  top: 14px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--dk-accent-ink);
  border: 1px solid var(--dk-accent);
  color: var(--dk-accent);
  font-family: var(--dk-mono);
  font-size: 0.82rem;
  line-height: 26px;
  text-align: center;
}

.dk-quote {
  margin: 0 0 12px;
  padding: 14px 16px;
  background: var(--dk-inset);
  border-left: 3px solid var(--dk-accent);
  border-radius: 0 8px 8px 0;
}

.dk-quote p {
  color: #d5deea;
}

.dk-quote cite {
  display: block;
  margin-top: 8px;
  color: var(--dk-dim);
  font-style: normal;
  font-size: 0.86rem;
  font-family: var(--dk-mono);
}

.dk-faq {
  display: grid;
  gap: 10px;
}

.dk-faq article {
  padding: 14px 16px;
  background: var(--dk-inset);
  border: 1px solid var(--dk-line);
  border-radius: 8px;
}

.dk-faq h3 {
  margin-bottom: 6px;
  color: #f3f7fd;
}

.dk-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 22px;
  background:
    linear-gradient(90deg, rgba(46, 230, 166, 0.12), transparent 55%),
    var(--dk-panel);
  border: 1px solid var(--dk-line-2);
  border-radius: var(--dk-radius);
}

.dk-cta h2 {
  margin-bottom: 6px;
}

.dk-cta p {
  color: var(--dk-mute);
}

.dk-note {
  margin: 12px 0 0;
  padding: 10px 12px;
  background: rgba(245, 193, 74, 0.08);
  border: 1px solid rgba(245, 193, 74, 0.28);
  border-radius: 8px;
  color: #f6df9d;
  font-size: 0.92rem;
}

.dk-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.dk-stat b {
  color: var(--dk-accent);
  font-size: 1.2rem;
  font-family: var(--dk-mono);
}

.dk-stat span {
  color: var(--dk-mute);
  font-size: 0.82rem;
}

.dk-split {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 16px;
}

.dk-foot {
  border-top: 1px solid var(--dk-line);
  background: #05070a;
  padding: 18px 16px 22px;
  text-align: center;
}

.dk-foot p {
  margin: 0 0 6px;
  color: var(--dk-mute);
  font-size: 0.86rem;
}

.dk-foot p:last-child {
  margin-bottom: 0;
}

.dk-safe {
  color: var(--dk-accent) !important;
}

:focus-visible {
  outline: 2px solid var(--dk-accent);
  outline-offset: 2px;
}

.dk-icon-row {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--dk-blue);
}

.dk-ok {
  color: var(--dk-accent);
}

.dk-warn {
  color: var(--dk-amber);
}

.dk-bad {
  color: var(--dk-red);
}

@media (max-width: 900px) {
  .dk-grid,
  .dk-grid-4,
  .dk-split {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 1.42rem;
  }
}

@media (max-width: 720px) {
  :root {
    --dk-top: 104px;
  }

  .dk-topbar {
    height: auto;
    min-height: 56px;
    flex-wrap: wrap;
    padding: 8px 12px;
    gap: 8px;
  }

  .dk-nav {
    order: 3;
    flex-basis: 100%;
    justify-content: flex-start;
    overflow-x: auto;
  }

  .dk-top-dl {
    margin-left: auto;
  }

  .dk-wrap {
    width: min(1120px, calc(100% - 20px));
    padding-top: 18px;
  }

  .dk-hero,
  .dk-block {
    padding: 16px;
  }
}