:root {
  --primary: #00A9AC;
  --text: #1A1A1A;
  --text-secondary: #5F6368;
  --border: #E3E7EA;
  --bg: #F8FAFB;
  --surface: #FFFFFF;
}

:root[data-theme="dark"] {
  --primary: #35c9cc;
  --text: #E8EEF2;
  --text-secondary: #A8B3BD;
  --border: #2A3743;
  --bg: #0F151C;
  --surface: #17222D;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 104px 24px 96px;
}

.top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 12px 20px;
}

.top-bar-inner {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.top-bar a,
.top-bar-title {
  color: var(--primary);
  text-decoration: none;
  font-weight: 900;
  font-size: 30px;
  letter-spacing: 0.2px;
}

.top-bar-menu {
  position: relative;
}

.menu-toggle {
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  cursor: pointer;
}

.menu-toggle span {
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
}

.menu-panel {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  min-width: 220px;
  padding: 10px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.16);
}

.theme-toggle {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: transparent;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
  padding: 10px 12px;
  text-align: left;
  cursor: pointer;
}

h1 {
  font-size: 28px;
  margin-bottom: 4px;
}

h2 {
  font-size: 19px;
  margin-top: 40px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

h3 {
  font-size: 16px;
  margin-top: 24px;
}

p, li {
  font-size: 15px;
  color: var(--text);
}

.meta {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: 32px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 14px;
}

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

th {
  background: var(--bg);
}

.note {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--primary);
  border-radius: 8px;
  padding: 16px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 40px;
}

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

.placeholder {
  background: #FFF4E5;
  border: 1px dashed #D88400;
  border-radius: 6px;
  padding: 2px 6px;
  font-family: monospace;
  font-size: 0.95em;
}

@media (max-width: 640px) {
  .top-bar {
    padding: 10px 14px;
  }

  .top-bar a,
  .top-bar-title {
    font-size: 23px;
  }

  .wrap {
    padding: 96px 16px 72px;
  }
}