:root {
  --bg: #0a0c12;
  --bg2: #0d1018;
  --panel: #11151f;
  --panel2: #161b28;
  --border: #222a3a;
  --text: #d4dcec;
  --head: #f1f5fc;
  --muted: #8893a8;
  --faint: #5c6679;
  --accent: #4da3ff;
  --accent-ink: #0a1322;
  --amber: #ffcc44;
  --green: #3fb950;
  --red: #f85149;
  --maxw: 1160px;
  --radius: 14px;
  --shadow: 0 18px 50px rgba(0,0,0,0.45);
  --hdr: 60px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--hdr) + 14px); }

body {
  margin: 0;
  padding-top: var(--hdr);
  background:
    radial-gradient(1100px 620px at 78% -8%, rgba(77,163,255,0.14), transparent 60%),
    radial-gradient(900px 520px at 10% 4%, rgba(255,204,68,0.07), transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { color: var(--head); line-height: 1.18; letter-spacing: -0.01em; margin: 0 0 0.5em; }
h2 { font-size: 1.9rem; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1rem; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

svg { fill: currentColor; }

section { padding: 84px 0; border-top: 1px solid rgba(255,255,255,0.04); }
#view-content section { scroll-margin-top: calc(var(--hdr) + 14px); }
.section-head { max-width: 720px; margin-bottom: 40px; }
.section-head p { color: var(--muted); font-size: 1.05rem; margin: 0; }
.eyebrow {
  display: inline-block; font-size: 0.78rem; font-weight: 700; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 12px;
}

.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 60; height: var(--hdr);
  background: rgba(10,12,18,0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; gap: 18px; height: var(--hdr); }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 700; color: var(--head); font-size: 1.12rem; }
.brand:hover { text-decoration: none; }
.brand .mark { color: var(--accent); display: inline-flex; }
.brand .mark svg { width: 20px; height: 20px; display: block; }
.nav-links { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.nav-links a { color: var(--muted); font-size: 0.95rem; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.nav-links a.active { color: var(--head); }
.nav-links .ghost {
  color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 6px 14px;
}
.nav-links .ghost:hover { border-color: #38415a; background: var(--panel2); }
.nav-toggle { display: none; margin-left: auto; background: none; border: 0; color: var(--text); cursor: pointer; padding: 4px; }
.nav-toggle svg { width: 24px; height: 24px; display: block; }

#view-demo { position: relative; background: #04060c; }
#view-demo iframe { width: 100%; height: 80vh; min-height: 480px; border: 0; display: block; background: #04060c; }
.demo-hint {
  position: absolute; left: 50%; bottom: 16px; transform: translateX(-50%);
  max-width: min(680px, calc(100% - 32px)); text-align: center;
  background: rgba(13,16,24,0.92); border: 1px solid var(--border);
  color: var(--muted); font-size: 0.84rem; line-height: 1.5; padding: 9px 18px; border-radius: 12px;
  box-shadow: var(--shadow); pointer-events: none; z-index: 5;
  animation: hintfade 0.8s ease 10s forwards;
}
.demo-hint strong { color: var(--head); }
.demo-hint b { color: var(--text); }
@keyframes hintfade { to { opacity: 0; visibility: hidden; } }

.js #view-demo { position: fixed; top: var(--hdr); left: 0; right: 0; bottom: 0; }
.js #view-demo iframe { height: 100%; min-height: 0; }
.js #view-content { display: none; }
.js body.show-content #view-demo { display: none; }
.js body.show-content #view-content { display: block; }

.btn {
  display: inline-flex; align-items: center; gap: 9px; justify-content: center;
  font-size: 0.98rem; font-weight: 600; font-family: inherit;
  padding: 12px 22px; border-radius: 10px; cursor: pointer;
  border: 1px solid transparent; transition: transform .08s ease, background .15s ease, border-color .15s ease;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: #6fb6ff; }
.btn-ghost { background: var(--panel2); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: #1d2435; border-color: #38415a; }

.hero { padding: 70px 0 48px; text-align: center; }
.hero .pill {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--panel2); border: 1px solid var(--border);
  color: var(--muted); font-size: 0.85rem; padding: 6px 14px; border-radius: 999px; margin-bottom: 26px;
}
.hero .pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 9px var(--green); }
.hero-title { font-size: clamp(2.2rem, 5.2vw, 3.5rem); max-width: 18ch; margin: 0 auto 0.42em; }
.hero-title .hl { color: var(--accent); }
.hero .lede { font-size: clamp(1.05rem, 2.1vw, 1.3rem); color: var(--muted); max-width: 60ch; margin: 0 auto 32px; }
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-meta { margin-top: 26px; color: var(--faint); font-size: 0.9rem; display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  background: linear-gradient(180deg, var(--panel2), var(--panel));
  border: 1px solid var(--border); border-radius: var(--radius); padding: 24px;
}
.card .ico { color: var(--accent); display: block; margin-bottom: 14px; }
.card .ico svg { width: 26px; height: 26px; display: block; }
.card h3 { margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 0.96rem; margin: 0; }

.flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 30px; }
.flow .step { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 18px; }
.flow .step .num {
  font-size: 0.78rem; font-weight: 700; color: var(--accent-ink); background: var(--accent);
  width: 24px; height: 24px; border-radius: 7px; display: inline-flex; align-items: center; justify-content: center;
  margin-bottom: 12px;
}
.flow .step h3 { font-size: 1rem; margin-bottom: 6px; }
.flow .step p { color: var(--muted); font-size: 0.9rem; margin: 0; }
.flow-note { color: var(--muted); max-width: 760px; }
.flow-note code { background: var(--panel2); border: 1px solid var(--border); border-radius: 5px; padding: 1px 6px; font-size: 0.85em; }

.split { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 40px; align-items: start; }
.split ul { margin: 0; padding-left: 0; list-style: none; }
.split li { position: relative; padding: 8px 0 8px 30px; color: var(--muted); border-bottom: 1px solid rgba(255,255,255,0.04); }
.split li:last-child { border-bottom: 0; }
.split li::before { content: ""; position: absolute; left: 4px; top: 16px; width: 10px; height: 10px; border-radius: 50%; }
.split li.read::before { background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.split li.edit::before { background: var(--amber); box-shadow: 0 0 8px var(--amber); }
.split li.add::before { background: var(--green); }
.split li.del::before { background: var(--red); }
.split li b { color: var(--text); }

.server-note {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--panel); border: 1px solid var(--border); border-radius: 12px;
  padding: 16px 18px; margin-top: 20px;
}
.server-note .server-ico { color: var(--accent); flex: 0 0 auto; }
.server-note .server-ico svg { width: 24px; height: 24px; display: block; margin-top: 2px; }
.server-note h3 { font-size: 1.02rem; margin-bottom: 5px; }
.server-note p { color: var(--muted); font-size: 0.92rem; margin: 0; }

.tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.tab {
  background: var(--panel2); border: 1px solid var(--border); color: var(--muted);
  padding: 8px 16px; border-radius: 9px; cursor: pointer; font-size: 0.92rem; font-family: inherit;
}
.tab.active { color: var(--head); border-color: var(--accent); background: #16223a; }
.codeblock {
  position: relative; background: #060810; border: 1px solid var(--border); border-radius: 12px; overflow: hidden;
}
.codeblock pre {
  margin: 0; padding: 20px 22px; overflow-x: auto;
  font-family: "Cascadia Code", Consolas, ui-monospace, monospace; font-size: 0.9rem; line-height: 1.7;
  color: #cbd5e8;
}
.codeblock .cm { color: var(--faint); }
.codeblock .cmd { color: #8fb3e6; }
.codeblock .copy {
  position: absolute; top: 12px; right: 12px;
  background: var(--panel2); border: 1px solid var(--border); color: var(--muted);
  border-radius: 7px; padding: 5px 12px; font-size: 0.78rem; cursor: pointer; font-family: inherit;
}
.codeblock .copy:hover { color: var(--text); border-color: #38415a; }
.codeblock .copy.ok { color: var(--green); border-color: var(--green); }
.pane { display: none; }
.pane.active { display: block; }
.opts { margin-top: 22px; color: var(--muted); font-size: 0.92rem; }
.opts code { background: var(--panel2); border: 1px solid var(--border); border-radius: 5px; padding: 1px 6px; }

.req-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.req { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 22px; }
.req h3 { font-size: 1.02rem; }
.req p { color: var(--muted); font-size: 0.92rem; margin: 0; }

.faq { max-width: 820px; }
.faq details { border: 1px solid var(--border); border-radius: 11px; background: var(--panel); margin-bottom: 12px; overflow: hidden; }
.faq summary {
  list-style: none; cursor: pointer; padding: 18px 22px; font-weight: 600; color: var(--head);
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-size: 1.3rem; line-height: 1; flex: 0 0 auto; }
.faq details[open] summary::after { content: "\2212"; }
.faq .answer { padding: 0 22px 20px; color: var(--muted); }
.faq .answer p { margin: 0; }

.cta-strip { text-align: center; }
.cta-strip h2 { margin-bottom: 14px; }
.cta-strip p { color: var(--muted); max-width: 54ch; margin: 0 auto 28px; }

.site-footer { border-top: 1px solid var(--border); padding: 36px 0; color: var(--faint); font-size: 0.9rem; }
.footer-row { display: flex; justify-content: space-between; align-items: center; gap: 18px; flex-wrap: wrap; }
.foot-brand { display: flex; align-items: center; gap: 9px; color: var(--muted); }
.foot-brand .mark { color: var(--accent); display: inline-flex; }
.foot-brand .mark svg { width: 18px; height: 18px; display: block; }
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a { color: var(--muted); }

@media (max-width: 900px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .req-grid { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; gap: 26px; }
}
@media (max-width: 680px) {
  section { padding: 60px 0; }
  .feature-grid { grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex; flex-direction: column; gap: 0; align-items: stretch;
    position: absolute; top: var(--hdr); left: 0; right: 0;
    background: var(--bg2); border-bottom: 1px solid var(--border); padding: 8px 22px;
  }
  .nav-links.open a { padding: 12px 0; border-bottom: 1px solid var(--border); }
  .nav-links.open .ghost { border: 0; border-radius: 0; padding: 12px 0; }
  .nav-toggle { display: block; }
  #view-demo iframe { height: calc(100vh - var(--hdr)); }
}