/* Reset & base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #ffffff;
  --bg-alt: #f7f8fa;
  --bg-dark: #1a1d23;
  --text: #1a1d23;
  --text-muted: #5a6478;
  --accent: #3b7cf4;
  --accent-dark: #2563d8;
  --border: #e2e6ed;
  --code-bg: #f0f2f7;
  --radius: 10px;
  --shadow: 0 2px 16px rgba(0,0,0,.08);
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
header {
  position: sticky;
  top: 0;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
}

.logo-name {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -.02em;
}

nav {
  display: flex;
  align-items: center;
  gap: 20px;
}

nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: .9rem;
  transition: color .15s;
}

nav a:hover { color: var(--accent); }

.nav-gh {
  padding: 6px 14px;
  background: var(--text);
  color: #fff !important;
  border-radius: 6px;
  font-weight: 500;
  transition: background .15s !important;
}

.nav-gh:hover { background: var(--accent) !important; }

/* Hero */
.hero {
  text-align: center;
  padding: 80px 24px 72px;
  background: linear-gradient(160deg, #f0f4ff 0%, #fff 60%);
}

.hero-icon {
  width: 80px;
  height: 80px;
  margin-bottom: 20px;
  border-radius: 20px;
  box-shadow: var(--shadow);
}

.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -.04em;
  line-height: 1.1;
  margin-bottom: 16px;
}

.tagline {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.version-note {
  font-size: .82rem;
  color: #9aa3b4;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 11px 24px;
  border-radius: 8px;
  font-size: .95rem;
  font-weight: 600;
  text-decoration: none;
  transition: all .15s;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(59,124,244,.35);
}

.btn-primary:hover {
  background: var(--accent-dark);
  box-shadow: 0 4px 14px rgba(59,124,244,.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg);
  color: var(--text);
  border: 1.5px solid var(--border);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* Features */
.features {
  padding: 72px 0;
  background: var(--bg);
}

.features h2,
.shortcuts h2,
.tech h2,
.download h2 {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -.02em;
  margin-bottom: 36px;
  text-align: center;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}

.feature-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow .15s, transform .15s;
}

.feature-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 12px;
  line-height: 1;
}

.feature-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.feature-card p {
  font-size: .88rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.feature-card code {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: .82em;
  background: var(--code-bg);
  padding: 1px 5px;
  border-radius: 4px;
}

/* Shortcuts */
.shortcuts {
  padding: 72px 0;
  background: var(--bg-alt);
}

.shortcut-table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
}

thead tr {
  background: var(--border);
}

th {
  text-align: left;
  padding: 10px 16px;
  font-weight: 600;
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  color: var(--text-muted);
}

td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}

tbody tr:last-child td { border-bottom: none; }

tbody tr:hover { background: rgba(59,124,244,.04); }

kbd {
  display: inline-block;
  padding: 2px 7px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 5px;
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: .8rem;
  box-shadow: 0 1px 0 var(--border);
  white-space: nowrap;
}

.shortcut-note {
  margin-top: 16px;
  font-size: .85rem;
  color: var(--text-muted);
  text-align: center;
}

/* Tech */
.tech {
  padding: 72px 0;
  background: var(--bg);
}

.tech-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 12px;
}

.tech-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .92rem;
}

.tech-label {
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--accent);
  min-width: 110px;
}

/* Download */
.download {
  padding: 72px 0 80px;
  background: var(--bg-dark);
  color: #e8ecf4;
  text-align: center;
}

.download h2 {
  color: #fff;
  margin-bottom: 16px;
}

.download > .container > p {
  color: #9aa3b4;
  max-width: 520px;
  margin: 0 auto 28px;
}

.code-block {
  background: #12151b;
  border: 1px solid #2d3344;
  border-radius: var(--radius);
  padding: 20px 24px;
  text-align: left;
  margin: 0 auto 20px;
  max-width: 600px;
  overflow-x: auto;
}

.code-block pre {
  margin: 0;
}

.code-block code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: .85rem;
  line-height: 1.7;
  color: #a8d8a8;
}

.code-block code .comment { color: #5a6a7e; }

.download-note {
  color: #6b7793;
  font-size: .85rem;
  margin-bottom: 28px;
}

.download-note code {
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: .83em;
  background: #1e2330;
  padding: 2px 6px;
  border-radius: 4px;
  color: #9aa3b4;
}

/* Footer */
footer {
  background: #12151b;
  padding: 22px 0;
  border-top: 1px solid #1e2330;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-size: .85rem;
  color: #5a6a7e;
}

footer a {
  color: #9aa3b4;
  text-decoration: none;
  transition: color .15s;
}

footer a:hover { color: var(--accent); }

/* Responsive */
@media (max-width: 600px) {
  .hero h1 { font-size: 2.2rem; }
  .tagline { font-size: 1rem; }
  .feature-grid { grid-template-columns: 1fr; }
  .tech-list { grid-template-columns: 1fr; }
  .footer-inner { justify-content: center; text-align: center; }
  nav { gap: 12px; }
}