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

body {
  background: #0a0a0a;
  color: #d4d4d4;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  line-height: 1.7;
  min-height: 100vh;
}

/* ── Nav ─────────────────────────────────────────────────────────────────── */
nav {
  display: flex; align-items: center; gap: 10px;
  padding: 14px 24px; border-bottom: 1px solid #1a1a1a; font-size: 0.82rem;
  position: sticky; top: 0; background: rgba(10,10,10,0.95);
  backdrop-filter: blur(8px); z-index: 50;
}
nav .spacer { flex: 1; }
nav a { color: #555; text-decoration: none; transition: color 0.2s; }
nav a:hover { color: #ccc; }
nav .sep { color: #333; }
nav .current { color: #e0e0e0; }
.nav-stamp { color: #3a3a3a; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.16em; }
#nav-auth { position: relative; }
#nav-auth-btn {
  background: none; border: 1px solid #252525; border-radius: 6px;
  color: #444; font-size: 0.75rem; padding: 4px 10px; cursor: pointer;
  font-family: inherit; transition: color 0.2s, border-color 0.2s;
  text-decoration: none; display: inline-block; line-height: 1.6;
}
#nav-auth-btn:hover { color: #888; border-color: #333; }
#nav-auth-btn.authed { color: #4ade80; border-color: rgba(74,222,128,0.25); }
#nav-auth-dropdown {
  display: none; position: absolute; right: 0; top: calc(100% + 6px);
  background: #0e0e0e; border: 1px solid #1e1e1e; border-radius: 8px;
  min-width: 160px; z-index: 200; overflow: hidden;
}
#nav-auth-dropdown.open { display: block; }
.nav-dd-item {
  display: block; padding: 9px 14px; font-size: 0.8rem; color: #888;
  text-decoration: none; cursor: pointer; background: none; border: none;
  font-family: inherit; width: 100%; text-align: left; transition: background .15s, color .15s;
}
.nav-dd-item:hover { background: #161616; color: #ccc; }
.nav-dd-item.danger:hover { color: #f87171; }

/* ── Layout ──────────────────────────────────────────────────────────────── */
.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 42px 24px 88px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.hero,
.section-card {
  background: #0e0e0e;
  border: 1px solid #1e1e1e;
  border-radius: 20px;
}

.hero {
  padding: 36px;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "Live Integration";
  position: absolute;
  right: 24px;
  top: 24px;
  color: rgba(245,158,11,0.28);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.eyebrow {
  color: #f59e0b;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin-bottom: 14px;
}
h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  line-height: 0.96;
  letter-spacing: -0.04em;
  margin-bottom: 18px;
  color: #e0e0e0;
}
.hero-copy {
  max-width: 760px;
  color: #777;
  font-size: 0.97rem;
}
.hero-copy a { color: #f59e0b; text-decoration: none; }
.hero-copy a:hover { text-decoration: underline; }
.hero-copy strong { color: #d4d4d4; }
.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}
.meta-pill {
  display: inline-flex;
  align-items: center;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid #252525;
  background: #111;
  color: #555;
  font-size: 0.8rem;
}

/* ── Two-column grid ─────────────────────────────────────────────────────── */
.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

/* ── Section card ────────────────────────────────────────────────────────── */
.section-card {
  padding: 26px;
}
.section-card h2 {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #e0e0e0;
  margin-bottom: 14px;
}
.section-card p { color: #777; font-size: 0.94rem; }
.section-card p + p { margin-top: 12px; }
.section-card li { color: #777; font-size: 0.94rem; }
.section-card ul {
  padding-left: 18px;
  display: grid;
  gap: 10px;
  margin-top: 10px;
}
.section-card a { color: #f59e0b; text-decoration: none; }
.section-card a:hover { text-decoration: underline; }
.section-card strong { color: #d4d4d4; }
.section-card code {
  font-family: "SFMono-Regular", "Consolas", monospace;
  font-size: 0.84em;
  background: rgba(245,158,11,0.1);
  padding: 2px 5px;
  border-radius: 4px;
  color: #fbbf24;
}

/* ── Note / Quote ────────────────────────────────────────────────────────── */
.note {
  margin-top: 14px;
  padding: 13px 16px;
  border-left: 3px solid #f59e0b;
  background: rgba(245,158,11,0.06);
  border-radius: 0 10px 10px 0;
  color: #aaa;
  font-size: 0.9rem;
}
.note code { background: rgba(245,158,11,0.12); color: #fbbf24; }
.quote {
  margin-top: 14px;
  padding: 16px 18px;
  border: 1px solid #252525;
  border-radius: 14px;
  background: #111;
  color: #999;
  font-size: 0.9rem;
  font-style: italic;
}

/* ── HTTP GET vs JSON-RPC ────────────────────────────────────────────────── */
.rpc-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 20px;
}
.rpc-col { display: flex; flex-direction: column; gap: 10px; }
.rpc-label {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.rpc-label-http {
  background: rgba(245,158,11,0.1);
  border: 1px solid rgba(245,158,11,0.22);
  color: #f59e0b;
}
.rpc-label-rpc {
  background: rgba(167,139,250,0.1);
  border: 1px solid rgba(167,139,250,0.22);
  color: #a78bfa;
}
.rpc-block {
  background: #060606;
  border: 1px solid #1a1a1a;
  border-radius: 12px;
  overflow: hidden;
  flex: 1;
}
.rpc-block-title {
  padding: 7px 14px;
  background: #0e0e0e;
  border-bottom: 1px solid #1a1a1a;
  font-size: 0.7rem;
  font-family: "SFMono-Regular", "Consolas", monospace;
  color: #444;
}
.rpc-block pre {
  padding: 14px 16px;
  margin: 0;
  overflow-x: auto;
  font-size: 0.8rem;
  line-height: 1.65;
  font-family: "SFMono-Regular", "Consolas", monospace;
  color: #888;
}
.hl-method { color: #f59e0b; }
.hl-key    { color: #a78bfa; }
.hl-str    { color: #4ade80; }
.hl-num    { color: #60a5fa; }
.hl-dim    { color: #444; }
.rpc-diff {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 14px;
}
.rpc-diff-item {
  padding: 12px 14px;
  border-radius: 10px;
}
.rpc-diff-item strong {
  display: block;
  margin-bottom: 5px;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.rpc-diff-item p { color: #666; font-size: 0.85rem; margin: 0; }
.rpc-diff-http { background: rgba(245,158,11,0.05); border: 1px solid rgba(245,158,11,0.13); }
.rpc-diff-http strong { color: #f59e0b; }
.rpc-diff-rpc  { background: rgba(167,139,250,0.05); border: 1px solid rgba(167,139,250,0.13); }
.rpc-diff-rpc strong { color: #a78bfa; }

/* ── REST vs MCP comparison ──────────────────────────────────────────────── */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
  margin-top: 22px;
}
.compare-col { display: flex; flex-direction: column; gap: 14px; }
.compare-label {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.compare-label-rest {
  background: rgba(245,158,11,0.1);
  border: 1px solid rgba(245,158,11,0.22);
  color: #f59e0b;
}
.compare-label-mcp {
  background: rgba(167,139,250,0.1);
  border: 1px solid rgba(167,139,250,0.22);
  color: #a78bfa;
}
.arch-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px;
  background: #111;
  border: 1px solid #1e1e1e;
  border-radius: 14px;
}
.arch-box {
  width: 100%;
  padding: 10px 14px;
  border-radius: 8px;
  text-align: center;
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1.3;
}
.arch-sub {
  display: block;
  font-weight: 400;
  font-size: 0.72rem;
  opacity: 0.65;
  margin-top: 2px;
}
.arch-app   { background: rgba(245,158,11,0.09); border: 1px solid rgba(245,158,11,0.18); color: #fbbf24; }
.arch-api   { background: rgba(74,222,128,0.07);  border: 1px solid rgba(74,222,128,0.15);  color: #4ade80; }
.arch-model { background: rgba(245,158,11,0.09); border: 1px solid rgba(245,158,11,0.18); color: #fbbf24; }
.arch-mcp   { background: rgba(167,139,250,0.09); border: 1px solid rgba(167,139,250,0.18); color: #a78bfa; }
.arch-arrow { font-size: 0.74rem; color: #333; padding: 5px 0; text-align: center; }
.compare-list {
  padding-left: 18px;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.compare-list li { font-size: 0.88rem; color: #666; }
.compare-list em { color: #a78bfa; font-style: normal; }

/* ── Sequence diagram ────────────────────────────────────────────────────── */
.sequence-diagram {
  display: grid;
  grid-template-columns: 160px 1fr 200px;
  gap: 12px;
  margin: 22px 0;
  background: #111;
  border: 1px solid #1e1e1e;
  border-radius: 16px;
  padding: 20px 16px;
}
.seq-col { display: flex; flex-direction: column; }
.seq-col-left, .seq-col-right { align-items: center; justify-content: flex-start; padding-top: 8px; }
.seq-col-center { gap: 12px; }
.seq-actor {
  background: rgba(245,158,11,0.08);
  border: 1px solid rgba(245,158,11,0.2);
  border-radius: 10px;
  padding: 10px 12px;
  text-align: center;
  font-size: 0.8rem;
  font-weight: 600;
  color: #f59e0b;
  line-height: 1.3;
}
.seq-sub {
  display: block;
  font-size: 0.67rem;
  font-weight: 400;
  color: #444;
  margin-top: 4px;
  word-break: break-all;
}
.seq-step {
  background: #0e0e0e;
  border: 1px solid #1e1e1e;
  border-radius: 10px;
  padding: 10px 12px;
}
.seq-msg { font-size: 0.78rem; font-weight: 600; margin-bottom: 4px; }
.seq-msg-right { color: #f59e0b; }
.seq-msg-left  { color: #a78bfa; }
.seq-note      { font-size: 0.73rem; color: #555; }

/* ── Code block ──────────────────────────────────────────────────────────── */
.code-block {
  margin-top: 18px;
  background: #060606;
  border: 1px solid #1a1a1a;
  border-radius: 14px;
  overflow: hidden;
}
.code-label {
  padding: 8px 16px;
  background: #0e0e0e;
  border-bottom: 1px solid #1a1a1a;
  font-size: 0.7rem;
  color: #444;
  font-family: "SFMono-Regular", monospace;
}
.code-block pre { padding: 16px; overflow-x: auto; margin: 0; }
.code-block code {
  background: none; padding: 0;
  font-size: 0.84rem; color: #fbbf24; line-height: 1.6;
  font-family: "SFMono-Regular", "Consolas", monospace;
}

/* ── Flow diagram ────────────────────────────────────────────────────────── */
.flow-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 22px auto;
  max-width: 560px;
}
.flow-step {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 14px 18px;
  background: #111;
  border: 1px solid #1e1e1e;
  border-radius: 14px;
}
.flow-step-mcp {
  background: rgba(167,139,250,0.06);
  border-color: rgba(167,139,250,0.18);
}
.flow-icon { font-size: 1.4rem; flex-shrink: 0; width: 36px; text-align: center; }
.flow-body { flex: 1; min-width: 0; }
.flow-title { font-size: 0.9rem; font-weight: 600; color: #d4d4d4; margin-bottom: 3px; }
.flow-desc { font-size: 0.8rem; color: #555; }
.flow-connector { font-size: 0.9rem; color: #222; line-height: 1; padding: 2px 0; }

/* ── Usage banner ────────────────────────────────────────────────────────── */
.usage-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
  padding: 14px 18px;
  background: rgba(245,158,11,0.04);
  border: 1px solid rgba(245,158,11,0.14);
  border-radius: 14px;
}
.usage-info { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.usage-label { font-size: 0.82rem; font-weight: 600; color: #d4d4d4; }
.usage-chip {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(245,158,11,0.2);
  background: rgba(245,158,11,0.07);
  color: #f59e0b;
  font-size: 0.75rem;
}
.usage-link { font-size: 0.84rem; color: #f59e0b; text-decoration: none; font-weight: 600; }
.usage-link:hover { text-decoration: underline; }

/* ── Retro grid ──────────────────────────────────────────────────────────── */
.retro-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 16px;
}
.retro-item { padding: 14px 16px; border-radius: 10px; }
.retro-bad  { background: rgba(248,113,113,0.06); border: 1px solid rgba(248,113,113,0.14); }
.retro-good { background: rgba(74,222,128,0.06);  border: 1px solid rgba(74,222,128,0.14); }
.retro-label { font-size: 0.76rem; font-weight: 700; margin-bottom: 6px; }
.retro-bad  .retro-label { color: #f87171; }
.retro-good .retro-label { color: #4ade80; }
.retro-item p { color: #666; font-size: 0.86rem; margin: 0; }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 980px) {
  .grid, .compare-grid, .retro-grid, .rpc-compare, .rpc-diff { grid-template-columns: 1fr; }
  .sequence-diagram { grid-template-columns: 1fr; }
  .seq-col-left, .seq-col-right { display: none; }
}
@media (max-width: 760px) {
  nav { flex-wrap: wrap; padding: 12px 16px; }
  .wrap { padding: 28px 16px 72px; }
  .hero, .section-card { border-radius: 16px; }
  h1 { letter-spacing: -0.03em; }
}