/* ============================================================
   PortableWeb — site styles
   Design tokens + components. Pairs with flow.css (hero animation).
   ============================================================ */

:root {
  --ink:           #0f0f1a;
  --ink-soft:      #2d2d50;
  --paper:         #f7f8ff;
  --paper-shadow:  #edeeff;
  --paper-darker:  #e2e4f8;
  --accent:        #7c3aed;
  --accent-soft:   #9f67f5;
  --rule:          rgba(15,15,26,0.18);
  --muted:         #6565a0;
  --muted-soft:    #9090b8;
  --gradient:      linear-gradient(135deg, #7c3aed 0%, #2563eb 46%, #20d6d2 100%);
  --serif:         "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --sans:          "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono:          "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --ink:           #e8e8ff;
    --ink-soft:      #b0b0d8;
    --paper:         #08080f;
    --paper-shadow:  #0f0f1e;
    --paper-darker:  #181828;
    --accent:        #a78bfa;
    --accent-soft:   #7c3aed;
    --rule:          rgba(232,232,255,0.15);
    --muted:         #7070a8;
    --muted-soft:    #454570;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

html, body {
  margin: 0; padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 18px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
body {
  background-image:
    radial-gradient(at 15% 25%, rgba(0,0,0,0.025) 0%, transparent 50%),
    radial-gradient(at 85% 75%, rgba(0,0,0,0.025) 0%, transparent 50%);
  background-attachment: fixed;
  min-height: 100vh;
}

a {
  color: var(--accent); text-decoration: none;
  border-bottom: 1px solid currentColor; transition: opacity 0.15s ease;
}
a:hover { opacity: 0.7; }

/* scrollbar */
* { scrollbar-width: thin; scrollbar-color: var(--muted) transparent; }
::-webkit-scrollbar { width: 13px; height: 13px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background-color: var(--muted); border-radius: 10px; border: 3px solid var(--paper); background-clip: padding-box; }
::-webkit-scrollbar-thumb:hover { background-color: var(--ink-soft); }
::-webkit-scrollbar-corner { background: transparent; }

code, pre { font-family: var(--mono); font-size: 0.85em; }

/* layout */
.wrap { max-width: 940px; margin: 0 auto; padding: 0 clamp(1.25rem, 4vw, 2.5rem); }
.wrap.narrow { max-width: 880px; }

/* header */
header.site {
  padding: 2rem 0 1.5rem;
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--muted); gap: 1rem; flex-wrap: wrap;
}
.mark { display: flex; align-items: center; gap: 0.6rem; color: var(--ink); border-bottom: none; }
.mark-glyph { width: 24px; height: 24px; flex-shrink: 0; color: var(--ink); display: block; }
.mark-word { font-family: "Geist", var(--sans); font-size: 1.05rem; font-weight: 600; letter-spacing: -0.02em; text-transform: none; color: var(--ink); line-height: 1; }

nav.site { display: flex; gap: 1.5rem; align-items: center; }
nav.site a { color: var(--muted); border-bottom: none; }
nav.site a:hover { color: var(--ink); }
nav.site a.nav-app {
  color: var(--ink); border: 1px solid var(--rule); padding: 0.34rem 0.75rem;
  border-radius: 6px; white-space: nowrap; display: inline-flex; align-items: center; gap: 0.4rem;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
nav.site a.nav-app:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); opacity: 1; }
nav.site a.nav-app svg { transition: transform 0.15s ease; }
nav.site a.nav-app:hover svg { transform: translateX(2px); }

/* hero */
.hero { padding: clamp(2.5rem, 7vh, 4.5rem) 0 clamp(2.5rem, 6vh, 4rem); }
.status {
  display: inline-flex; align-items: center; max-width: 100%; gap: 0.5rem;
  padding: 0.35rem 0.8rem; border: 1px solid var(--rule);
  font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--ink); margin-bottom: 1.75rem;
}
.status::before { content: ""; display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); animation: pulse 2.4s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.4} }

h1.hero-title {
  font-family: var(--serif); font-weight: 600;
  font-size: clamp(2.5rem, 6.4vw, 4.4rem); line-height: 1.03; letter-spacing: -0.027em;
  margin: 0 0 1.5rem; max-width: 16ch;
}
h1.hero-title .accent { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-lede { font-size: clamp(1.12rem, 2vw, 1.38rem); line-height: 1.5; max-width: 40em; margin: 0 0 2.25rem; color: var(--ink-soft); }
.cta-row { display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; margin-bottom: clamp(2.75rem, 6vw, 4rem); }

.btn {
  display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.7rem 1.3rem;
  font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase;
  border: 1px solid var(--ink); color: var(--ink); background: transparent;
  border-bottom: 1px solid var(--ink); transition: all 0.18s ease;
}
.btn:hover { background: var(--ink); color: var(--paper); opacity: 1; }
.btn.primary { background: var(--gradient); border-color: transparent; color: #fff; }
.btn.primary:hover { opacity: 0.88; color: #fff; }

/* credibility strip */
.cred {
  margin-top: 2.5rem;
  border: 1px solid var(--rule);
  border-radius: 12px;
  background: var(--paper-shadow);
  display: grid; grid-template-columns: 1fr 1fr; gap: 1px;
  overflow: hidden;
}
.cred a {
  display: flex; align-items: center; gap: 0.9rem;
  padding: 1.05rem 1.25rem; background: var(--paper);
  border-bottom: none; color: var(--ink);
  transition: background 0.16s ease;
}
.cred a:hover { background: var(--paper-shadow); opacity: 1; }
.cred-badge {
  flex-shrink: 0; width: 46px; height: 46px; border-radius: 10px;
  display: grid; place-items: center;
  font-family: var(--mono); font-weight: 600; font-size: 0.62rem; letter-spacing: 0.04em;
  background: var(--ink); color: var(--paper); text-align: center; line-height: 1.05;
}
.cred-badge.ietf { background: var(--gradient); color: #fff; }
.cred-text { display: flex; flex-direction: column; gap: 0.1rem; min-width: 0; }
.cred-kicker { font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); }
.cred-name { font-weight: 600; font-size: 0.96rem; letter-spacing: -0.01em; color: var(--ink); }
.cred-arrow { margin-left: auto; color: var(--muted); transition: transform 0.16s ease; }
.cred a:hover .cred-arrow { transform: translateX(3px); color: var(--ink); }
@media (max-width: 620px) { .cred { grid-template-columns: 1fr; } }

/* section primitives */
section.block { padding: clamp(3rem, 7vh, 5rem) 0; border-top: 1px solid var(--rule); }
.eyebrow { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--muted); margin: 0 0 1.5rem; display: flex; align-items: center; gap: 0.75rem; }
.eyebrow::before { content: ""; width: 24px; height: 2px; background: var(--gradient); border-radius: 2px; }

h2 { font-family: var(--serif); font-weight: 600; font-size: clamp(1.85rem, 4vw, 2.5rem); line-height: 1.15; letter-spacing: -0.015em; margin: 0 0 1.5rem; max-width: 24ch; }
h3 { font-family: var(--serif); font-weight: 500; font-size: 1.25rem; margin: 0 0 0.5rem; color: var(--ink); }
p { margin: 0 0 1rem; max-width: 38em; }
.lead-p { font-size: 1.18rem; color: var(--ink-soft); max-width: 34em; }

/* problem — failed alternatives */
.fail-list { margin-top: 2rem; border-top: 1px solid var(--rule); }
.fail {
  display: grid; grid-template-columns: 13rem 1fr; gap: 1.5rem;
  padding: 1.25rem 0; border-bottom: 1px solid var(--rule); align-items: baseline;
}
.fail-name { font-weight: 600; font-size: 1.05rem; color: var(--ink); display: flex; flex-direction: column; align-items: flex-start; gap: 0.55rem; }
.fail-name .x { font-family: var(--mono); font-size: 0.7rem; color: var(--accent); border: 1px solid var(--rule); border-radius: 5px; padding: 0.18rem 0.45rem; letter-spacing: 0.06em; white-space: nowrap; }
.fail p { margin: 0; font-size: 0.98rem; color: var(--ink-soft); }
@media (max-width: 600px) { .fail { grid-template-columns: 1fr; gap: 0.4rem; } }

.pull {
  margin: 2.5rem 0 0; padding: 1.75rem 0 0; border-top: 2px solid var(--ink);
  font-size: clamp(1.3rem, 2.6vw, 1.7rem); font-weight: 600; line-height: 1.28;
  letter-spacing: -0.015em; max-width: 26ch; color: var(--ink);
}
.pull .accent { background: var(--gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

/* anatomy */
.anatomy { display: grid; grid-template-columns: 1fr; gap: 0; margin: 2rem 0 1rem; border: 1px solid var(--rule); background: var(--paper-shadow); max-width: 580px; font-family: var(--mono); font-size: 0.85rem; }
.anatomy-row { display: grid; grid-template-columns: 14ch 1fr; gap: 1rem; padding: 0.85rem 1.25rem; border-bottom: 1px solid var(--rule); align-items: baseline; }
.anatomy-row:last-child { border-bottom: none; }
.anatomy-row.header { background: var(--ink); color: var(--paper); font-size: 0.65rem; letter-spacing: 0.2em; text-transform: uppercase; padding: 0.5rem 1.25rem; }
.anatomy-row .filename { color: var(--ink); font-weight: 600; }
.anatomy-row .filename .req { color: var(--accent); font-weight: 400; }
.anatomy-row .desc { color: var(--muted); font-family: var(--serif); font-size: 1rem; line-height: 1.4; }
.anatomy-row.header .filename, .anatomy-row.header .desc { color: var(--paper); font-family: var(--mono); font-size: 0.65rem; }

/* pillars */
.pillars { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; margin-top: 2rem; }
@media (max-width: 540px) { .pillars { grid-template-columns: 1fr; } }
.pillar h3::before { content: ""; display: block; width: 36px; height: 2px; background: var(--gradient); border-radius: 2px; margin-bottom: 1rem; }
.pillar p { color: var(--ink-soft); font-size: 0.95rem; }

/* use cases */
.use-cases { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); margin-top: 2rem; }
.use-case { background: var(--paper); padding: 1.5rem 1.25rem; }
.use-case .num { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.18em; color: var(--muted); margin-bottom: 0.75rem; }
.use-case h3 { font-size: 1.1rem; }
.use-case p { font-size: 0.9rem; color: var(--ink-soft); margin: 0; }

/* comparison */
.comparison { margin-top: 2rem; overflow-x: auto; }
.comparison table { width: 100%; border-collapse: collapse; font-size: 0.9rem; min-width: 540px; }
.comparison th, .comparison td { text-align: left; padding: 0.85rem 1rem; border-bottom: 1px solid var(--rule); vertical-align: top; }
.comparison th { font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--muted); font-weight: 400; }
.comparison td.format { font-family: var(--mono); font-size: 0.8rem; color: var(--ink); letter-spacing: 0.05em; }
.comparison td.format.us { color: var(--accent); }
.comparison td p { margin: 0; font-size: 0.9rem; color: var(--ink-soft); }

/* roadmap */
.roadmap { display: grid; gap: 1rem; margin-top: 2rem; }
.roadmap-item { display: grid; grid-template-columns: 8ch 1fr; gap: 1.5rem; padding: 1rem 0; border-bottom: 1px solid var(--paper-darker); align-items: baseline; }
.roadmap-item:last-child { border-bottom: none; }
.roadmap-version { font-family: var(--mono); font-size: 0.85rem; color: var(--accent); letter-spacing: 0.05em; }
.roadmap-version.future { color: var(--muted); }
.roadmap-body h3 { font-size: 1rem; margin-bottom: 0.25rem; }
.roadmap-body p { margin: 0; font-size: 0.9rem; color: var(--ink-soft); }

/* get involved links */
.links-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1rem; margin-top: 2rem; }
.link-card { display: block; padding: 1.5rem 1.25rem; border: 1px solid var(--rule); color: var(--ink); transition: all 0.18s ease; }
.link-card:hover { background: var(--ink); color: var(--paper); opacity: 1; }
.link-card:hover .link-arrow { transform: translateX(3px); }
.link-card:hover .link-desc { color: var(--paper-shadow); }
.link-card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem; }
.link-title { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.18em; text-transform: uppercase; }
.link-arrow { transition: transform 0.18s ease; }
.link-desc { font-size: 0.9rem; color: var(--ink-soft); font-family: var(--serif); }

/* viewer section */
.viewer-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 2.75rem; align-items: start; margin-top: 2.25rem; }
@media (max-width: 760px) { .viewer-grid { grid-template-columns: 1fr; gap: 2rem; } }
.viewer-caps { list-style: none; padding: 0; margin: 0 0 2rem; display: flex; flex-direction: column; }
.viewer-caps li { display: flex; gap: 0.85rem; padding: 0.95rem 0; border-bottom: 1px solid var(--paper-darker); align-items: flex-start; }
.viewer-caps li:last-child { border-bottom: none; }
.vc-icon { width: 32px; height: 32px; border-radius: 9px; background: var(--paper-shadow); display: flex; align-items: center; justify-content: center; flex-shrink: 0; color: var(--accent); margin-top: 1px; }
.vc-title { display: block; font-weight: 600; font-size: 0.98rem; color: var(--ink); letter-spacing: -0.01em; }
.vc-desc { display: block; font-size: 0.9rem; color: var(--ink-soft); line-height: 1.5; margin-top: 0.12rem; }
.vc-desc code { font-family: var(--mono); font-size: 0.82em; }
.viewer-cta { display: flex; flex-direction: column; align-items: flex-start; gap: 0.95rem; }
.viewer-install-note { font-size: 0.85rem; color: var(--muted); max-width: 34em; margin: 0; }

.app-mock { border: 1px solid var(--rule); border-radius: 14px; overflow: hidden; display: flex; height: 360px; background: var(--paper); box-shadow: 0 18px 50px rgba(15,15,26,0.16); }
.mock-rail { width: 44%; max-width: 168px; background: #0c0c16; padding: 14px 10px; display: flex; flex-direction: column; gap: 3px; position: relative; }
.mock-rail::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 2px; background: var(--gradient); }
.mock-brand { display: flex; align-items: center; gap: 7px; color: #e8e8ff; padding: 4px 6px 10px; }
.mock-brand svg { width: 16px; height: 16px; }
.mock-brand .mb-word { font-family: var(--sans); font-size: 12px; font-weight: 600; letter-spacing: -0.02em; }
.mock-label { font-family: var(--mono); font-size: 7.5px; letter-spacing: 0.18em; text-transform: uppercase; color: rgba(168,168,210,0.5); padding: 9px 7px 4px; }
.mock-item { display: flex; align-items: center; gap: 8px; padding: 6px 7px; border-radius: 6px; color: #c7c7e4; font-family: var(--sans); font-size: 10.5px; }
.mock-item .mi-ic { width: 16px; height: 16px; border-radius: 4px; background: rgba(168,168,210,0.13); flex-shrink: 0; }
.mock-work { flex: 1; display: flex; flex-direction: column; background: var(--paper); }
.mock-topbar { height: 28px; border-bottom: 1px solid var(--rule); display: flex; align-items: center; padding: 0 12px; }
.mock-crumb { font-family: var(--mono); font-size: 8px; letter-spacing: 0.06em; color: var(--muted); }
.mock-body { flex: 1; display: flex; align-items: center; justify-content: center; padding: 16px; }
.mock-hero { width: 100%; border: 1.5px dashed var(--rule); border-radius: 12px; background: var(--paper-shadow); padding: 20px 12px; text-align: center; display: flex; flex-direction: column; align-items: center; gap: 6px; }
.mock-hero .mh-glyph { width: 32px; height: 32px; border-radius: 9px; background: var(--paper); border: 1px solid var(--rule); display: flex; align-items: center; justify-content: center; color: var(--ink); }
.mock-hero .mh-glyph svg { width: 17px; height: 17px; }
.mock-hero .mh-title { font-family: var(--sans); font-weight: 600; font-size: 12px; color: var(--ink); white-space: nowrap; }
.mock-hero .mh-sub { font-family: var(--sans); font-size: 8.5px; color: var(--muted); }
.mock-hero .mh-btn { margin-top: 5px; padding: 6px 13px; border-radius: 7px; background: var(--gradient); color: #fff; font-family: var(--sans); font-size: 9.5px; font-weight: 600; white-space: nowrap; }
@media (max-width: 760px) { .app-mock { height: 320px; } }

/* footer */
footer { padding: 4rem 0 3rem; border-top: 1px solid var(--rule); margin-top: 4rem; font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); }
.footer-grid { display: flex; justify-content: space-between; align-items: flex-end; gap: 2rem; flex-wrap: wrap; }
.footer-meta { display: flex; flex-direction: column; gap: 0.4rem; }
.footer-meta a { color: var(--muted); border-bottom: 1px solid transparent; }
.footer-meta a:hover { color: var(--ink); border-bottom-color: currentColor; }

/* project status board */
.stateboard { margin-top: 2rem; border-top: 1px solid var(--rule); }
.state-row { display: grid; grid-template-columns: 13rem 1fr; gap: 1.5rem; padding: 1.1rem 0; border-bottom: 1px solid var(--rule); align-items: baseline; }
.state-body h3 { font-size: 1.02rem; margin-bottom: 0.2rem; }
.state-body p { margin: 0; font-size: 0.92rem; color: var(--ink-soft); }
.st { justify-self: start; font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.12em; text-transform: uppercase; padding: 0.24rem 0.6rem; border-radius: 5px; border: 1px solid var(--rule); white-space: nowrap; display: inline-flex; align-items: center; gap: 0.45rem; }
.st::before { content: ""; width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; }
.st.done { color: var(--ink); }
.st.done::before { background: #20d6d2; }
.st.wip { color: var(--accent); }
.st.wip::before { background: var(--accent); animation: pulse 2.4s infinite; }
@media (max-width: 600px) { .state-row { grid-template-columns: 1fr; gap: 0.45rem; } }

/* who chips + roadmap beyond chips */
.who-chips, .beyond-chips { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.who-chips { margin-top: 1.5rem; }
.beyond-chips { margin-top: 0.75rem; }
.who-chips span, .beyond-chips span { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.04em; color: var(--ink); border: 1px solid var(--rule); border-radius: 999px; padding: 0.42rem 0.9rem; background: var(--paper-shadow); }
.beyond-chips span { font-size: 0.7rem; padding: 0.3rem 0.7rem; color: var(--ink-soft); }

/* FAQ */
.faq-list { margin-top: 2rem; border-top: 1px solid var(--rule); max-width: 44em; }
.faq-list details { border-bottom: 1px solid var(--rule); }
.faq-list summary { cursor: pointer; list-style: none; display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; padding: 1.05rem 0; font-weight: 600; font-size: 1.02rem; color: var(--ink); }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; font-family: var(--mono); color: var(--muted); font-weight: 400; font-size: 1.1rem; line-height: 1; transition: transform 0.18s ease; flex-shrink: 0; }
.faq-list details[open] summary::after { transform: rotate(45deg); color: var(--accent); }
.faq-list details p { margin: 0 0 1.15rem; font-size: 0.95rem; color: var(--ink-soft); }
.faq-list details p a { border-bottom: 1px solid currentColor; }

/* reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* small screens */
@media (max-width: 600px) {
  header.site { padding: 1.75rem 0 1.25rem; gap: 0.75rem 1rem; }
  nav.site { gap: 1rem; align-items: center; }
  nav.site a[href^="#"] { display: none; }
  nav.site a.nav-app { font-size: 0.7rem; }
}
@media (max-width: 540px) {
  nav.site { gap: 0.9rem; }
  .status { align-items: flex-start; letter-spacing: 0.1em; line-height: 1.45; }
  .anatomy-row { grid-template-columns: 1fr; gap: 0.25rem; }
  .roadmap-item { grid-template-columns: 1fr; gap: 0.4rem; }
}