:root {
  --bg: #111827;
  --panel: #1f2937;
  --mint: #6ee7b7;
  --mint-deep: #047857;
  --key: #d1fae5;
  --ink: #ecfdf5;
  --muted: #9ca3af;
  --line: #374151;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: auto;
}

body {
  font-family: "Consolas", "Sarasa Mono SC", "Microsoft YaHei", monospace;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
}

svg {
  display: block;
}

a {
  color: var(--mint);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.wrap {
  width: min(1040px, calc(100% - 28px));
  margin: 0 auto;
}

.site-header {
  background: #030712;
  border-bottom: 1px solid var(--line);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.brand svg {
  width: 28px;
  height: 28px;
  color: var(--mint);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  font-size: 13px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.hero {
  padding: 44px 0 20px;
}

.hero h1 {
  font-size: clamp(22px, 3vw, 32px);
  line-height: 1.4;
  margin-bottom: 16px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.hero p {
  max-width: 44em;
  margin-bottom: 8px;
  color: #d1d5db;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.key-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.keycap {
  background: linear-gradient(180deg, #f0fdf4 0%, #a7f3d0 70%, #6ee7b7 100%);
  color: #064e3b;
  border-radius: 8px;
  min-width: 56px;
  height: 56px;
  padding: 0 12px;
  box-shadow: 0 4px 0 #047857, 0 6px 12px rgba(0, 0, 0, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 14px;
}

.keycap.wide {
  min-width: 120px;
}

.section {
  padding: 34px 0;
  border-top: 1px solid var(--line);
}

.section h2 {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 22px;
  margin-bottom: 14px;
}

.lead {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  margin-bottom: 16px;
  color: #d1d5db;
}

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

.pane {
  background: var(--panel);
  padding: 18px;
  border-radius: 12px;
}

.pane h3 {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  margin-bottom: 10px;
  color: var(--mint);
}

.pane p,
.pane li {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.pane ul {
  padding-left: 18px;
}

.pane li {
  margin-bottom: 8px;
}

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

.hand {
  background: var(--panel);
  padding: 18px;
  border: 2px solid var(--mint-deep);
}

.hand h3 {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  margin-bottom: 8px;
}

.hand p,
.hand li {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.hand ul {
  padding-left: 18px;
}

.hand li {
  margin-bottom: 8px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #030712;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
}

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

th {
  background: #064e3b;
  color: #ecfdf5;
}

.kbd {
  display: inline-block;
  background: var(--key);
  color: #064e3b;
  border-radius: 5px;
  padding: 1px 7px;
  box-shadow: 0 2px 0 #047857;
  font-weight: 700;
  font-size: 12px;
}

.fix-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.fix {
  background: var(--panel);
  padding: 16px;
}

.fix h3 {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  margin: 8px 0 10px;
  color: var(--mint);
}

.fix p {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.fix svg {
  width: 22px;
  height: 22px;
  color: var(--mint);
}

.ime {
  background: #064e3b;
  padding: 18px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.ime h3 {
  margin-bottom: 10px;
}

.ime ol {
  padding-left: 20px;
}

.ime li {
  margin-bottom: 8px;
}

.faq details {
  background: var(--panel);
  margin-bottom: 10px;
  border-left: 4px solid var(--mint);
}

.faq summary {
  cursor: pointer;
  padding: 14px 16px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 700;
  list-style: none;
}

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

.faq p {
  padding: 0 16px 12px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.site-footer {
  background: #030712;
  color: var(--muted);
  padding: 28px 0 36px;
  font-size: 13px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.site-footer p {
  margin-bottom: 8px;
}

@media (max-width: 860px) {
  .header-row {
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 0;
  }

  .split,
  .hands,
  .fix-grid {
    grid-template-columns: 1fr;
  }
}