/* 第5套 web · 深色工具站 / charcoal + bright blue */
:root {
  --s5-bg: #0c0f14;
  --s5-elev: #10141b;
  --s5-panel: #171c25;
  --s5-panel-2: #1c232e;
  --s5-line: #2b3442;
  --s5-text: #e8eef6;
  --s5-dim: #8f9aab;
  --s5-blue: #3ba0ff;
  --s5-blue-deep: #1e78e0;
  --s5-blue-soft: rgba(59, 160, 255, 0.14);
  --s5-focus: #7ec4ff;
  --s5-danger: #5a6b80;
}

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

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  padding: 76px 0 0;
  color: var(--s5-text);
  background: var(--s5-bg);
  font-family: "Microsoft YaHei", "Microsoft YaHei UI", "PingFang SC", sans-serif;
  font-size: 16.5px;
  line-height: 1.8;
}

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

a {
  color: var(--s5-blue);
}

a:hover {
  color: var(--s5-focus);
}

.s5-skip {
  position: absolute;
  left: -999px;
  top: 0;
}

.s5-skip:focus {
  left: 12px;
  top: 84px;
  z-index: 80;
  background: var(--s5-blue);
  color: #071018;
  padding: 6px 12px;
  font-weight: 700;
}

.s5-topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  background: #080b10;
  border-bottom: 1px solid var(--s5-line);
}

.s5-topbar-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding: 10px 0;
}

.s5-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--s5-text);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.s5-brand svg {
  width: 30px;
  height: 30px;
  flex-shrink: 0;
}

.s5-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 2px;
}

.s5-nav a {
  display: inline-block;
  text-decoration: none;
  color: var(--s5-dim);
  padding: 6px 12px;
  border-radius: 4px;
}

.s5-nav a:hover {
  color: var(--s5-text);
  background: var(--s5-blue-soft);
}

.s5-nav a.is-current,
.s5-nav a[aria-current="page"] {
  color: var(--s5-text);
  background: var(--s5-blue-soft);
  box-shadow: inset 0 -2px 0 var(--s5-blue);
}

.s5-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  text-decoration: none;
  padding: 9px 16px;
  border: 1px solid var(--s5-blue);
  background: var(--s5-blue);
  color: #071018;
  font-weight: 700;
  border-radius: 4px;
}

.s5-btn:hover {
  background: var(--s5-focus);
  border-color: var(--s5-focus);
  color: #071018;
}

.s5-btn svg {
  width: 16px;
  height: 16px;
}

.s5-btn-top {
  white-space: nowrap;
}

.s5-btn-ghost {
  background: transparent;
  color: var(--s5-text);
  border-color: var(--s5-line);
}

.s5-btn-ghost:hover {
  background: var(--s5-panel-2);
  border-color: var(--s5-blue);
  color: var(--s5-text);
}

.s5-btn-mac,
.s5-btn-ios,
.s5-btn-and {
  background: var(--s5-panel-2);
  border-color: #3a4658;
  color: var(--s5-text);
}

.s5-btn-mac:hover,
.s5-btn-ios:hover,
.s5-btn-and:hover {
  border-color: var(--s5-blue);
  color: var(--s5-text);
  background: #222a36;
}

.s5-wrap {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto 48px;
}

.s5-hero,
.s5-section {
  background: var(--s5-panel);
  border: 1px solid var(--s5-line);
  border-radius: 8px;
  padding: 28px 32px 30px;
  margin: 0 0 16px;
}

.s5-hero {
  margin-top: 20px;
}

.s5-kicker {
  margin: 0 0 10px;
  color: var(--s5-blue);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.s5-hero h1,
.s5-section h2 {
  margin: 0 0 14px;
  line-height: 1.35;
  color: #f4f8fd;
  font-weight: 700;
}

.s5-hero h1 {
  font-size: 30px;
}

.s5-section h2 {
  font-size: 22px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--s5-line);
}

.s5-section h3 {
  margin: 20px 0 8px;
  font-size: 18px;
  color: #d7e4f4;
}

.s5-hero p,
.s5-section p {
  margin: 0 0 12px;
  color: #c5cede;
}

.s5-tools {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin: 16px 0 6px;
}

.s5-tool {
  background: var(--s5-elev);
  border: 1px solid var(--s5-line);
  border-radius: 6px;
  padding: 12px 14px;
}

.s5-tool strong {
  display: block;
  color: var(--s5-blue);
  font-size: 14px;
  margin-bottom: 4px;
}

.s5-tool span {
  color: var(--s5-dim);
  font-size: 13px;
}

.s5-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.s5-note {
  margin: 16px 0 0;
  padding: 12px 14px;
  background: var(--s5-blue-soft);
  border-left: 3px solid var(--s5-blue);
  color: var(--s5-dim);
  font-size: 15px;
}

.s5-cols {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.s5-block {
  margin: 0 0 8px;
  padding: 4px 0 4px 14px;
  border-left: 3px solid var(--s5-blue);
}

.s5-card {
  background: var(--s5-elev);
  border: 1px solid var(--s5-line);
  border-radius: 6px;
  padding: 16px 16px 14px;
}

.s5-card h3 {
  margin-top: 0;
}

.s5-plat {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.s5-plat article {
  background: var(--s5-elev);
  border: 1px solid var(--s5-line);
  border-radius: 6px;
  padding: 16px;
}

.s5-plat h3 {
  margin-top: 0;
}

.s5-tag {
  display: inline-block;
  margin: 0 0 8px;
  padding: 2px 8px;
  font-size: 12px;
  font-weight: 700;
  color: var(--s5-blue);
  background: var(--s5-blue-soft);
  border-radius: 3px;
}

.s5-table-wrap {
  overflow-x: auto;
  margin: 12px 0;
}

.s5-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--s5-elev);
  font-size: 15px;
}

.s5-table th,
.s5-table td {
  border: 1px solid var(--s5-line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.s5-table th {
  background: #0f151d;
  color: var(--s5-blue);
  font-weight: 700;
}

.s5-table tr:nth-child(even) td {
  background: #141a22;
}

.s5-reviews {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.s5-review {
  background: var(--s5-elev);
  border: 1px solid var(--s5-line);
  border-radius: 6px;
  padding: 16px 18px;
}

.s5-review strong {
  color: #f0f5fb;
}

.s5-review .s5-role {
  color: var(--s5-blue);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 8px;
}

.s5-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: s5step;
}

.s5-steps li {
  position: relative;
  margin: 0 0 12px;
  padding: 12px 14px 12px 54px;
  background: var(--s5-elev);
  border: 1px solid var(--s5-line);
  border-radius: 6px;
}

.s5-steps li::before {
  counter-increment: s5step;
  content: counter(s5step);
  position: absolute;
  left: 12px;
  top: 16px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--s5-blue);
  color: #071018;
  text-align: center;
  line-height: 28px;
  font-size: 14px;
  font-weight: 700;
}

.s5-steps h3 {
  margin-top: 0;
}

.s5-faq {
  margin-top: 8px;
}

.s5-faq-item {
  margin: 0 0 10px;
  background: var(--s5-elev);
  border: 1px solid var(--s5-line);
  border-left: 3px solid var(--s5-blue);
  border-radius: 0 6px 6px 0;
  padding: 4px 14px 10px;
}

.s5-faq-item summary {
  cursor: pointer;
  font-weight: 700;
  color: #f0f5fb;
  padding: 8px 0;
  list-style: none;
}

.s5-faq-item summary::-webkit-details-marker {
  display: none;
}

.s5-faq-item p {
  margin: 0 0 8px;
  color: var(--s5-dim);
}

.s5-footer {
  background: #080b10;
  color: var(--s5-dim);
  padding: 28px 16px 36px;
  border-top: 1px solid var(--s5-line);
}

.s5-footer-inner {
  width: min(1120px, calc(100% - 8px));
  margin: 0 auto;
}

.s5-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-bottom: 12px;
}

.s5-footer nav a {
  color: var(--s5-text);
}

.s5-safe {
  padding: 10px 12px;
  border: 1px solid var(--s5-line);
  background: var(--s5-panel);
  color: var(--s5-text);
  margin: 0 0 12px;
  border-radius: 4px;
}

.s5-copy {
  margin: 0;
  font-size: 14px;
}

@media (max-width: 900px) {
  .s5-hero h1 {
    font-size: 26px;
  }

  .s5-section h2 {
    font-size: 20px;
  }

  .s5-hero,
  .s5-section {
    padding: 22px 20px 24px;
  }

  .s5-tools {
    grid-template-columns: 1fr 1fr;
  }

  .s5-cols,
  .s5-plat {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  body {
    padding-top: 138px;
    font-size: 15.5px;
  }

  .s5-topbar-inner,
  .s5-wrap {
    width: calc(100% - 20px);
  }

  .s5-btn-top {
    width: 100%;
  }

  .s5-hero h1 {
    font-size: 22px;
  }

  .s5-section h2 {
    font-size: 18px;
  }

  .s5-tools,
  .s5-cols,
  .s5-plat {
    grid-template-columns: 1fr;
  }

  .s5-nav a {
    padding: 6px 8px;
  }
}