@import "./tokens.css";

/* =========================================================================
 * Asagiri — Variant A · 朝霧捲軸 (single-scroll narrative)
 * Self-contained stylesheet. Borrows the Ryūmu design system from the live
 * design-site (mist, glass cards, dew on hover) and extends it with the
 * generation-demo timeline, the admin gate, and owner controls.
 * ========================================================================= */

/* === Reset === */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; min-height: 100%; }
/* Clip decorative scroll-chrome bleed (knobs, mist bands, brocade) at the
   page edge so the primary VERTICAL reading flow never gains a horizontal
   page scrollbar — required for 320px / 200%-zoom reflow safety. The
   dedicated 絵巻 region opts back IN to its own horizontal scroll locally. */
html { overflow-x: clip; }
body { min-height: 100%; margin: 0; overflow-x: clip; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* === Body & atmosphere === */
body {
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: clamp(1rem, 0.94rem + 0.25vw, 1.0625rem);
  line-height: 1.65;
  letter-spacing: 0.005em;
  background:
    radial-gradient(ellipse at 80% 110%, var(--bg-warm), transparent 50%),
    var(--bg-base);
  position: relative;
  overflow-x: hidden;
}
@media (prefers-color-scheme: dark) {
  body {
    background:
      radial-gradient(ellipse at 50% -10%, var(--bg-warm), transparent 55%),
      var(--bg-base);
  }
}

/* === Mist layers (decorative) === */
.mist {
  position: fixed;
  inset: -10%;
  pointer-events: none;
  z-index: 0;
  mix-blend-mode: screen;
  opacity: 0.55;
  will-change: transform;
}
@media (prefers-color-scheme: dark) {
  .mist { mix-blend-mode: lighten; opacity: 0.35; }
}
.mist-a { animation: drift-a 60s ease-in-out infinite; }
.mist-b { animation: drift-b 90s ease-in-out infinite; opacity: 0.4; }
.mist-c { animation: drift-c 120s ease-in-out infinite; opacity: 0.3; }
@media (prefers-color-scheme: dark) {
  .mist-b { opacity: 0.25; }
  .mist-c { opacity: 0.2; }
}
@keyframes drift-a {
  0% { transform: translate3d(-5%, 2%, 0); }
  50% { transform: translate3d(5%, -3%, 0); }
  100% { transform: translate3d(-5%, 2%, 0); }
}
@keyframes drift-b {
  0% { transform: translate3d(3%, -2%, 0); }
  50% { transform: translate3d(-4%, 3%, 0); }
  100% { transform: translate3d(3%, -2%, 0); }
}
@keyframes drift-c {
  0% { transform: translate3d(-2%, 4%, 0); }
  50% { transform: translate3d(4%, -2%, 0); }
  100% { transform: translate3d(-2%, 4%, 0); }
}

/* === Links === */
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* === Headings === */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.012em;
  margin: 0 0 var(--space-5);
}
h1 {
  font-size: clamp(2.25rem, 1.7rem + 2.4vw, 3.5rem);
  animation: breath 8s ease-in-out infinite;
}
h1 .glow {
  color: var(--accent);
  text-shadow: 0 0 24px var(--accent-glow);
}
h2 {
  font-size: clamp(1.5rem, 1.25rem + 1vw, 2rem);
  margin-top: var(--space-8);
}
h3 {
  font-size: clamp(1.125rem, 1rem + 0.5vw, 1.375rem);
  margin-top: var(--space-6);
}
@keyframes breath {
  0%, 100% { letter-spacing: -0.012em; }
  50%      { letter-spacing: -0.002em; }
}
@media (prefers-reduced-motion: reduce) {
  h1 { animation: none; }
}

p { margin: 0 0 var(--space-4); max-width: 70ch; }

/* === Code === */
code, kbd, pre { font-family: var(--font-mono); font-size: 0.95em; }
code {
  background: var(--bg-sunk);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  border: 1px solid var(--border-soft);
}
pre {
  background: var(--bg-sunk);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.55;
}
pre code { background: transparent; padding: 0; border: none; }

/* === Skip link === */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--space-2);
  z-index: 100;
  background: var(--bg-elev);
  color: var(--fg);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  backdrop-filter: blur(8px);
}
.skip-link:focus-visible { top: var(--space-2); }

/* === Visually hidden === */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* === Header === */
header.site {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg-elev);
  backdrop-filter: blur(20px) saturate(120%);
  -webkit-backdrop-filter: blur(20px) saturate(120%);
}
header.site .row {
  max-width: 920px;
  margin: 0 auto;
  padding: var(--space-3) var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}
header.site .brand {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.0625rem;
  letter-spacing: 0.005em;
  text-decoration: none;
  color: var(--fg);
}
header.site .brand .ja {
  font-weight: 400;
  font-size: 0.9375rem;
  color: var(--fg-muted);
}
header.site nav.primary {
  display: flex;
  gap: var(--space-1);
  margin-left: auto;
  flex-wrap: wrap;
}
header.site nav.primary a {
  color: var(--fg-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: color 300ms ease, background-color 300ms ease;
}
header.site nav.primary a:hover { color: var(--fg); }
header.site nav.primary a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* === Layout === */
.page {
  position: relative;
  z-index: 1;
  max-width: 920px;
  margin: 0 auto;
  padding: var(--space-7) var(--space-5) var(--space-9);
}
section { scroll-margin-top: 5rem; }
.section + .section { margin-top: var(--space-9); }

/* === Lede / meta / tag === */
.lede {
  font-size: clamp(1.0625rem, 1rem + 0.4vw, 1.25rem);
  color: var(--fg-muted);
  max-width: 42em;
  margin: 0 0 var(--space-6);
}
.meta {
  font-size: 0.8125rem;
  color: var(--fg-muted);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}
.tag {
  display: inline-block;
  font-size: 0.6875rem;
  font-family: var(--font-mono);
  padding: 0.15em 0.6em;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 4px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* === Hero === */
.hero {
  padding-top: var(--space-6);
  padding-bottom: var(--space-7);
}
.hero .meta { margin-bottom: var(--space-4); }
.hero .ja-large {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 1rem + 2vw, 2.25rem);
  color: var(--fg-muted);
  font-weight: 400;
  display: block;
  margin-bottom: var(--space-2);
  letter-spacing: 0.1em;
}
.hero p.lede { margin-top: var(--space-5); }
.scroll-cue {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-5);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--fg-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.scroll-cue .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent);
  animation: cue-pulse 2.6s ease-in-out infinite;
}
@keyframes cue-pulse {
  0%, 100% { opacity: 0.3; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(3px); }
}

/* === Glass card with dew on hover === */
.card {
  position: relative;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  backdrop-filter: blur(20px) saturate(115%);
  -webkit-backdrop-filter: blur(20px) saturate(115%);
  overflow: hidden;
  transition:
    transform 500ms cubic-bezier(0.2, 0.8, 0.2, 1),
    border-color 500ms ease,
    box-shadow 500ms ease;
}
.card::before {
  content: "";
  position: absolute;
  top: 14px;
  right: 16px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--dew), transparent 80%);
  box-shadow: inset 0 0 0 1px var(--dew-rim);
  opacity: 0;
  transform: translateY(-4px);
  transition: opacity 600ms ease, transform 600ms ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
}
.card:hover::before {
  opacity: 1;
  transform: translateY(0);
}
.card h3 { margin-top: 0; }
@media (prefers-reduced-motion: reduce) {
  .card { transition: border-color 200ms; }
  .card:hover { transform: none; box-shadow: var(--shadow-sm); }
  .card::before { transition: opacity 200ms; }
  .card:hover::before { transform: none; }
}

/* === Tables === */
table { width: 100%; border-collapse: collapse; margin: var(--space-4) 0; }
th, td {
  text-align: left;
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--border-soft);
  vertical-align: top;
}
th {
  color: var(--fg-muted);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
}

/* === Figures / diagrams === */
figure.diagram {
  margin: var(--space-5) 0;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  backdrop-filter: blur(12px);
  overflow-x: auto;
}
figure.diagram figcaption {
  margin-top: var(--space-3);
  font-size: 0.875rem;
  color: var(--fg-muted);
}
figure.diagram svg { display: block; max-width: 100%; height: auto; }

/* === Callout === */
.callout {
  position: relative;
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: var(--space-3) var(--space-4);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: var(--space-4) 0;
}
.callout strong { color: var(--accent); }

/* === Progressive-disclosure stages (details/summary) === */
.stages { margin: var(--space-5) 0; display: grid; gap: var(--space-3); }
details.stage {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  overflow: hidden;
  transition: border-color 300ms ease;
}
details.stage[open] { border-color: var(--accent); }
details.stage > summary {
  list-style: none;
  cursor: pointer;
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 44px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.0625rem;
}
details.stage > summary::-webkit-details-marker { display: none; }
details.stage > summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
  border-radius: var(--radius-lg);
}
.stage .num {
  flex: none;
  width: 2rem; height: 2rem;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
}
.stage .summary-text { flex: 1; }
.stage .summary-text .sub {
  display: block;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.8125rem;
  color: var(--fg-muted);
  letter-spacing: 0.01em;
  margin-top: 2px;
}
.stage .chev {
  flex: none;
  color: var(--fg-muted);
  transition: transform 300ms ease;
}
details.stage[open] .chev { transform: rotate(90deg); }
.stage .body {
  padding: 0 var(--space-5) var(--space-5);
  border-top: 1px solid var(--border-soft);
  margin-top: 0;
  padding-top: var(--space-4);
}
.stage .body p:last-child { margin-bottom: 0; }

/* === Flow strip (engine -> json -> webapp) === */
.flow-strip {
  display: flex;
  align-items: stretch;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin: var(--space-5) 0;
}
.flow-node {
  flex: 1 1 200px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  backdrop-filter: blur(12px);
}
.flow-node .kicker {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-2);
}
.flow-node h3 { margin: 0 0 var(--space-2); font-size: 1.0625rem; }
.flow-node p { margin: 0; font-size: 0.9rem; color: var(--fg-muted); }
.flow-arrow {
  flex: none;
  align-self: center;
  color: var(--accent);
  font-size: 1.5rem;
  line-height: 1;
}
@media (max-width: 640px) {
  .flow-arrow { transform: rotate(90deg); align-self: center; }
}

/* === Buttons === */
.btn {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  min-height: 44px;
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius);
  border: 1px solid var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  transition: background-color 250ms ease, border-color 250ms ease, transform 250ms ease;
}
.btn:hover { background: color-mix(in oklch, var(--accent) 18%, transparent); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }
.btn-primary {
  background: var(--accent);
  color: var(--bg-base);
  border-color: var(--accent);
  box-shadow: 0 0 0 0 var(--accent-glow);
  transition: box-shadow 400ms ease, background-color 250ms ease, transform 250ms ease;
}
.btn-primary:hover {
  background: color-mix(in oklch, var(--accent) 88%, white);
  box-shadow: 0 0 24px -2px var(--accent-glow);
}
.btn-ghost {
  background: transparent;
  color: var(--fg-muted);
  border-color: var(--border);
}
.btn-ghost:hover { color: var(--fg); border-color: var(--accent); background: var(--accent-soft); }
.btn-lg { font-size: 1.0625rem; padding: var(--space-3) var(--space-6); min-height: 52px; }
.btn-sm { font-size: 0.875rem; min-height: 44px; padding: var(--space-2) var(--space-4); }
@media (prefers-reduced-motion: reduce) {
  .btn:active { transform: none; }
}

/* === Generation demo === */
.demo-shell {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-5);
  backdrop-filter: blur(20px) saturate(115%);
  -webkit-backdrop-filter: blur(20px) saturate(115%);
}
.demo-launch {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}
.demo-launch .hint {
  font-size: 0.875rem;
  color: var(--fg-muted);
  margin: 0;
  flex: 1 1 240px;
}

/* run log: the agent-chain step stream */
.run-log {
  margin: var(--space-5) 0 0;
  display: grid;
  gap: var(--space-2);
}
.run-log:empty { display: none; }
.log-line {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
  border: 1px solid var(--border-soft);
  background: var(--bg-sunk);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.5;
  opacity: 0;
  transform: translateY(6px);
  animation: log-in 500ms ease forwards;
}
@keyframes log-in {
  to { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .log-line { opacity: 1; transform: none; animation: none; }
}
.log-line .stamp { color: var(--fg-muted); flex: none; }
.log-line .glyph { flex: none; width: 1.2em; text-align: center; }
.log-line.is-active { border-color: var(--accent); }
.log-line.is-active .glyph {
  color: var(--accent);
  animation: spin 1s linear infinite;
  display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) {
  .log-line.is-active .glyph { animation: none; }
}
.log-line.is-done .glyph { color: var(--accent); }
.log-line .text { color: var(--fg); }
.log-line .text b { color: var(--accent); font-weight: 600; }

.run-status-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--fg-muted);
}
.run-status-bar .progress-track {
  flex: 1;
  height: 4px;
  border-radius: 999px;
  background: var(--bg-sunk);
  overflow: hidden;
  border: 1px solid var(--border-soft);
}
.run-status-bar .progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent);
  border-radius: 999px;
  transition: width 600ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* === Idea cards (materialize one at a time) === */
.ideas-stream {
  margin-top: var(--space-6);
  display: grid;
  gap: var(--space-4);
}
.ideas-stream:empty { display: none; }

.idea-card {
  position: relative;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  backdrop-filter: blur(20px) saturate(115%);
  -webkit-backdrop-filter: blur(20px) saturate(115%);
  overflow: hidden;
}
/* dew condensing reveal */
.idea-card.condensing {
  opacity: 0;
  transform: translateY(14px) scale(0.99);
  filter: blur(6px);
  animation: condense 900ms cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}
@keyframes condense {
  0% { opacity: 0; transform: translateY(14px) scale(0.99); filter: blur(6px); }
  60% { opacity: 1; filter: blur(0); }
  100% { opacity: 1; transform: translateY(0) scale(1); filter: blur(0); }
}
@media (prefers-reduced-motion: reduce) {
  .idea-card.condensing { opacity: 1; transform: none; filter: none; animation: none; }
}
.idea-card:hover { border-color: var(--accent); box-shadow: var(--shadow-md); transition: border-color 400ms, box-shadow 400ms; }

.idea-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-2);
}
.idea-head .idnum {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--fg-muted);
}
.idea-card h3 {
  margin: 0;
  font-size: 1.375rem;
}
.idea-domain {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--accent);
  border: 1px solid var(--border);
  background: var(--accent-soft);
  padding: 0.1em 0.6em;
  border-radius: 999px;
}
.idea-oneliner {
  font-size: 1.0625rem;
  color: var(--fg);
  margin: var(--space-2) 0 var(--space-4);
  max-width: none;
}
.idea-scores {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-3);
}
.score {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 0.8125rem;
  color: var(--fg-muted);
  font-family: var(--font-mono);
}
.score .dots { display: inline-flex; gap: 3px; }
.score .pip {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--border);
  border: 1px solid var(--border);
}
.score .pip.on { background: var(--accent); border-color: var(--accent); }
.idea-tags {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: var(--space-3);
}
.idea-tags .tag { letter-spacing: 0.06em; }

.idea-card details.more {
  margin-top: var(--space-3);
  border-top: 1px solid var(--border-soft);
  padding-top: var(--space-3);
}
.idea-card details.more > summary {
  cursor: pointer;
  list-style: none;
  font-size: 0.875rem;
  color: var(--accent);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.idea-card details.more > summary::-webkit-details-marker { display: none; }
.idea-card details.more > summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }
.idea-card details.more h4 {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin: var(--space-4) 0 var(--space-1);
}
.idea-card details.more p { font-size: 0.95rem; }
.idea-card details.more ul { margin: 0 0 var(--space-3); padding-left: 1.25rem; font-size: 0.95rem; }
.idea-card details.more .sources a { word-break: break-word; }

/* === Owner zone (revealed after unlock) === */
.owner-actions {
  display: none;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px dashed var(--border);
  align-items: center;
}
body.is-admin .owner-actions { display: flex; }
.owner-actions .owner-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
  margin-right: auto;
}
.owner-actions .built {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

/* admin gate */
.gate {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-6) var(--space-5);
  backdrop-filter: blur(20px) saturate(115%);
  -webkit-backdrop-filter: blur(20px) saturate(115%);
}
.gate form { display: grid; gap: var(--space-3); max-width: 28rem; }
.gate label { display: grid; gap: var(--space-2); font-weight: 500; }
.gate input[type="password"] {
  font-family: var(--font-mono);
  font-size: 1rem;
  min-height: 48px;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-sunk);
  color: var(--fg);
}
.gate input[type="password"]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-color: var(--accent);
}
.gate .field-row { display: flex; gap: var(--space-3); flex-wrap: wrap; align-items: end; }
.gate .field-row > label { flex: 1 1 16rem; }
.gate .gate-msg {
  font-size: 0.875rem;
  min-height: 1.4em;
  margin: 0;
}
.gate .gate-msg.err { color: var(--danger); font-weight: 500; }
.gate .gate-msg.ok { color: var(--accent); font-weight: 500; }
.gate .stub-note {
  margin-top: var(--space-3);
  font-size: 0.8125rem;
  color: var(--fg-muted);
}
.gate .stub-note code { font-size: 0.85em; }

.gate.unlocked .lock-form { display: none; }
.unlocked-panel { display: none; }
.gate.unlocked .unlocked-panel { display: block; }
.unlocked-panel .row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  align-items: center;
  margin-top: var(--space-4);
}

/* === Dialog === */
dialog {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg-elev);
  color: var(--fg);
  padding: var(--space-6);
  max-width: min(32rem, calc(100vw - 2rem));
  backdrop-filter: blur(24px) saturate(120%);
  -webkit-backdrop-filter: blur(24px) saturate(120%);
  box-shadow: var(--shadow-md);
}
dialog::backdrop {
  background: oklch(0.2 0.03 240 / 45%);
  backdrop-filter: blur(3px);
}
dialog h3 { margin-top: 0; }
dialog p { color: var(--fg-muted); }
dialog .dialog-actions {
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
  flex-wrap: wrap;
  margin-top: var(--space-5);
}

/* === Toast (role=status) === */
.toast-region {
  position: fixed;
  left: 50%;
  bottom: var(--space-5);
  transform: translateX(-50%);
  z-index: 200;
  display: grid;
  gap: var(--space-2);
  width: min(28rem, calc(100vw - 2rem));
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  background: var(--bg-elev);
  border: 1px solid var(--accent);
  border-left-width: 3px;
  border-radius: var(--radius);
  padding: var(--space-3) var(--space-4);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  font-size: 0.9375rem;
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  animation: toast-in 400ms ease;
}
.toast .glyph { color: var(--accent); flex: none; }
@keyframes toast-in {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .toast { animation: none; }
}

/* === Footer === */
footer.site {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border-soft);
  margin-top: var(--space-9);
  padding: var(--space-5);
  text-align: center;
  color: var(--fg-muted);
  font-size: 0.875rem;
}
footer.site a { color: var(--fg-muted); }

/* =========================================================================
 * ===================  卷軸 / EMAKI HANDSCROLL LAYER  ====================
 * A2 transforms the single-scroll page into a mounted East-Asian hanging
 * /hand scroll. All of this chrome (mounting, rollers, cord, title slip,
 * mist scene-breaks, seals, brush rules) is DECORATIVE and aria-hidden.
 * The reading column (the .page <main>) is unchanged content; here it just
 * sits inside a 畫心 painting field on aged paper, wrapped by 裝裱 mounting.
 * ========================================================================= */

/* ---- The mounted scroll object -------------------------------------- */
.scroll-mount {
  position: relative;
  z-index: 1;
  max-width: 1040px;
  margin: var(--space-6) auto var(--space-5);
  padding: 0 var(--space-4);
}
@media (max-width: 640px) {
  .scroll-mount { padding: 0 var(--space-2); margin-top: var(--space-4); }
}

/* ---- 天杆 top rod + 掛繩 cord + 題簽 title slip --------------------- */
.scroll-top {
  position: relative;
  display: flex;
  justify-content: center;
  height: 84px;
  margin-bottom: -6px;
  z-index: 3;
}
/* hanging cords descend from above to the rod */
.scroll-top .cord {
  position: absolute;
  top: -40px;
  width: 2px;
  height: 64px;
  background: linear-gradient(var(--cord), color-mix(in oklab, var(--cord) 60%, transparent));
  border-radius: 2px;
  opacity: 0.85;
}
.scroll-top .cord-l { left: calc(50% - 60px); transform: rotate(7deg); transform-origin: top; }
.scroll-top .cord-r { left: calc(50% + 60px); transform: rotate(-7deg); transform-origin: top; }

.top-rod {
  position: relative;
  width: 100%;
  max-width: 980px;
  height: 26px;
  align-self: flex-end;
  border-radius: 999px;
  background:
    linear-gradient(180deg,
      color-mix(in oklab, var(--roller) 70%, white 18%) 0%,
      var(--roller) 42%,
      color-mix(in oklab, var(--roller) 70%, black 28%) 100%);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255,255,255,0.12);
}
/* roller knobs 軸頭 at both rod ends */
.knob {
  position: absolute;
  top: 50%;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background:
    radial-gradient(circle at 35% 30%,
      color-mix(in oklab, var(--roller-knob) 60%, white 22%),
      var(--roller-knob) 70%);
  box-shadow: var(--shadow-sm), inset 0 0 0 2px color-mix(in oklab, var(--roller-knob) 50%, black);
  transform: translateY(-50%);
}
.knob-l { left: -16px; }
.knob-r { right: -16px; }

/* 題簽 title slip: vertical decorative title, hangs over the painting field */
.title-slip {
  position: absolute;
  top: 22px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 4;
  width: 46px;
  min-height: 120px;
  padding: var(--space-3) 0 var(--space-2);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  background:
    linear-gradient(180deg,
      var(--paper-slip),
      color-mix(in oklab, var(--paper-slip) 86%, var(--silk) 14%));
  border: 1px solid var(--silk-edge);
  border-radius: 3px 3px 4px 4px;
  box-shadow: var(--shadow-sm);
}
.title-slip .slip-title {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-display);
  font-size: 1.5rem;
  letter-spacing: 0.12em;
  color: var(--ink);          /* ink on slip ~12.8:1 */
  line-height: 1.1;
}
.title-slip .slip-sub {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-display);
  font-size: 0.8125rem;
  letter-spacing: 0.18em;
  color: var(--ink-muted);    /* muted ink on slip, AA */
}

/* ---- 畫心 painting field that unrolls ------------------------------ */
.scroll-field {
  position: relative;
  transform-origin: top center;
  /* unroll-on-load: revealed from top downward via clip + scaleY.
     JS adds .is-unrolled; reduced-motion shows it open immediately (below). */
  clip-path: inset(0 0 100% 0);
  opacity: 0;
  transition:
    clip-path 1100ms cubic-bezier(0.16, 0.84, 0.24, 1),
    opacity 700ms ease;
}
.scroll-field.is-unrolled {
  clip-path: inset(0 0 0 0);
  opacity: 1;
}
/* If JS never runs OR no-animation context, keep field visible (progressive
   enhancement safety: .no-anim is added when reduced-motion is set). */
.scroll-mount.no-anim .scroll-field {
  clip-path: none;
  opacity: 1;
  transition: none;
}
@media (prefers-reduced-motion: reduce) {
  .scroll-field { clip-path: none; opacity: 1; transition: none; }
}

/* ---- 裝裱 mounting border (brocade) wrapping the reading column ---- */
.mounting {
  position: relative;
  border-radius: 4px;
  padding: clamp(10px, 2.4vw, 26px);
  /* brocade mounting: silk band with a quiet diaper/key-fret diaper pattern,
     all from repeating gradients (no images). */
  background-color: var(--silk);
  background-image:
    /* subtle key-fret diaper */
    repeating-linear-gradient(45deg,
      color-mix(in oklab, var(--silk-edge) 40%, transparent) 0 2px,
      transparent 2px 13px),
    repeating-linear-gradient(-45deg,
      color-mix(in oklab, var(--silk-edge) 30%, transparent) 0 2px,
      transparent 2px 13px),
    linear-gradient(180deg,
      color-mix(in oklab, var(--silk) 88%, white 6%),
      color-mix(in oklab, var(--silk) 84%, black 8%));
  box-shadow:
    var(--shadow-md),
    inset 0 0 0 1px color-mix(in oklab, var(--silk-edge) 60%, transparent);
}
/* inner gold-thread separator line between mounting and painting field */
.mounting::before {
  content: "";
  position: absolute;
  inset: clamp(7px, 1.7vw, 18px);
  border: 1px solid color-mix(in oklab, var(--paper-slip) 50%, var(--silk-edge));
  border-radius: 3px;
  pointer-events: none;
}

/* ---- the reading column becomes the painting field 畫心 ------------ */
.scroll-mount .page {
  position: relative;
  z-index: 1;
  max-width: 880px;
  margin: 0 auto;
  border-radius: 2px;
  /* aged silk/paper texture: layered warm gradients + faint fibre noise */
  background-color: var(--paper);
  background-image:
    radial-gradient(ellipse at 18% 8%, color-mix(in oklab, var(--paper) 60%, white 22%), transparent 42%),
    radial-gradient(ellipse at 82% 96%, color-mix(in oklab, var(--silk) 22%, transparent), transparent 46%),
    repeating-linear-gradient(0deg,
      color-mix(in oklab, var(--silk-edge) 7%, transparent) 0 1px,
      transparent 1px 4px),
    linear-gradient(180deg,
      color-mix(in oklab, var(--paper) 96%, white 4%),
      color-mix(in oklab, var(--paper) 92%, var(--silk) 6%));
  box-shadow:
    inset 0 1px 0 color-mix(in oklab, white 30%, transparent),
    inset 0 0 60px color-mix(in oklab, var(--silk) 16%, transparent);
  padding: var(--space-7) clamp(var(--space-4), 4vw, var(--space-7)) var(--space-8);
}
/* faint SVG-noise fibre overlay over the paper (decorative) */
.scroll-mount .page::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  border-radius: inherit;
  opacity: 0.5;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
}
@media (prefers-color-scheme: dark) {
  .scroll-mount .page::after { mix-blend-mode: screen; opacity: 0.35; }
}

/* ---- Ink the reading column: text on paper must read as sumi ink --- */
.scroll-mount .page,
.scroll-mount .page p { color: var(--ink); }
.scroll-mount .page .lede,
.scroll-mount .page .meta,
.scroll-mount .page .hint,
.scroll-mount .page .stub-note,
.scroll-mount .page figure.diagram figcaption,
.scroll-mount .page .emaki figcaption { color: var(--ink-muted); }
.scroll-mount .page h1,
.scroll-mount .page h2,
.scroll-mount .page h3,
.scroll-mount .page h4 { color: var(--ink); }
/* code on paper: warm sunk paper, dark ink */
.scroll-mount .page code {
  background: color-mix(in oklab, var(--paper-deep) 80%, var(--silk) 20%);
  border-color: color-mix(in oklab, var(--silk-edge) 40%, transparent);
  color: var(--ink);
}
/* hero 朝霧 watermark + glow tuned onto paper */
.scroll-mount .page .ja-large { color: color-mix(in oklab, var(--ink-muted) 70%, var(--silk-edge)); }
.scroll-mount .page .scroll-cue { color: var(--ink-muted); }

/* surfaces inside the painting field: lift glassy ryumu panels onto paper
   so they read like inset cartouches on the scroll, not floating glass. */
.scroll-mount .page .flow-node,
.scroll-mount .page figure.diagram,
.scroll-mount .page details.stage,
.scroll-mount .page .demo-shell,
.scroll-mount .page .gate,
.scroll-mount .page .idea-card {
  background-color: color-mix(in oklab, var(--paper-deep) 90%, white 4%);
  border-color: color-mix(in oklab, var(--silk-edge) 45%, transparent);
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}
.scroll-mount .page .flow-node p,
.scroll-mount .page details.stage .body p,
.scroll-mount .page .idea-oneliner { color: var(--ink); }
.scroll-mount .page .flow-node .kicker,
.scroll-mount .page .stage .summary-text .sub,
.scroll-mount .page .idea-head .idnum,
.scroll-mount .page .score { color: var(--ink-muted); }
.scroll-mount .page .run-log .log-line {
  background: color-mix(in oklab, var(--paper-deep) 82%, var(--silk) 18%);
  border-color: color-mix(in oklab, var(--silk-edge) 35%, transparent);
}
.scroll-mount .page .run-log .log-line .text { color: var(--ink); }
.scroll-mount .page .run-log .log-line .stamp { color: var(--ink-muted); }

/* ---- 地軸 bottom roller with 軸頭 knobs ---------------------------- */
.scroll-bottom {
  position: relative;
  display: flex;
  justify-content: center;
  margin-top: -4px;
  z-index: 3;
}
.bottom-roller {
  position: relative;
  width: 100%;
  max-width: 980px;
  height: 30px;
  border-radius: 999px;
  background:
    linear-gradient(180deg,
      color-mix(in oklab, var(--roller) 70%, white 16%) 0%,
      var(--roller) 40%,
      color-mix(in oklab, var(--roller) 70%, black 30%) 100%);
  box-shadow: var(--shadow-sm), inset 0 1px 0 rgba(255,255,255,0.12);
}
.bottom-roller .knob { width: 34px; height: 34px; }
.bottom-roller .knob-l { left: -18px; }
.bottom-roller .knob-r { right: -18px; }

/* =========================================================================
 * 雲斷 / MIST SCENE-BREAKS  — drifting cloud bands between scenes (decor)
 * ========================================================================= */
.scene-break {
  position: relative;
  height: clamp(56px, 9vw, 92px);
  margin: var(--space-7) calc(-1 * clamp(var(--space-4), 4vw, var(--space-7)));
  overflow: hidden;
  pointer-events: none;
}
.scene-break .mist-band {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
.scene-break .mist-band path { fill: var(--mist-band); }
.scene-break .mist-band .band-2 { fill: color-mix(in oklab, var(--mist-band) 70%, white 16%); }
.scene-break .band-drift {
  animation: band-drift 26s ease-in-out infinite alternate;
}
.scene-break .band-drift-rev {
  animation: band-drift-rev 32s ease-in-out infinite alternate;
}
@keyframes band-drift {
  from { transform: translateX(-30px); }
  to   { transform: translateX(30px); }
}
@keyframes band-drift-rev {
  from { transform: translateX(30px); }
  to   { transform: translateX(-30px); }
}
@media (prefers-reduced-motion: reduce) {
  .scene-break .band-drift,
  .scene-break .band-drift-rev { animation: none; }
}

/* =========================================================================
 * SCENE MARKERS + 印章 SEALS + 水墨 BRUSH RULES
 * ========================================================================= */
.scene-mark {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin: 0 0 var(--space-3);
}
.scene-mark .scene-no {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--seal-text);     /* paired with the seal, but also a text label */
}

/* red seal stamp (落款 / 印章): square cinnabar block, glyph carved in paper */
.seal {
  display: inline-grid;
  place-items: center;
  flex: none;
  background: var(--seal);
  border-radius: 4px;
  box-shadow:
    inset 0 0 0 1px color-mix(in oklab, var(--seal) 50%, black 28%),
    var(--shadow-sm);
}
.seal svg { display: block; }
.seal svg path,
.seal svg use { fill: var(--paper-slip); }   /* carved glyph = paper, ~5.5:1 */
.seal-scene { width: 38px; height: 38px; padding: 4px; }
.seal-scene svg { width: 30px; height: 30px; }

/* brush-stroke rule introducing a section header (水墨) */
.brush-head {
  position: relative;
  padding-top: var(--space-3);
}
.brush-head::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: clamp(120px, 26%, 200px);
  height: 6px;
  border-radius: 6px 6px 6px 2px;
  background:
    radial-gradient(ellipse at 0% 50%, var(--ink) 60%, transparent),
    linear-gradient(90deg, var(--ink) 0%, color-mix(in oklab, var(--ink) 50%, transparent) 78%, transparent);
  /* tapered sumi brush stroke */
  clip-path: polygon(0 35%, 88% 0%, 100% 50%, 88% 100%, 0 65%);
  opacity: 0.85;
}

/* =========================================================================
 * 絵巻 HORIZONTAL PIPELINE STRIP — keyboard-scrollable region + fallback
 * ========================================================================= */
.emaki {
  position: relative;
  margin: var(--space-5) 0;
}
.emaki-viewport {
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
  border-radius: var(--radius-lg);
  border: 1px solid color-mix(in oklab, var(--silk-edge) 55%, transparent);
  background-color: var(--paper);
  background-image:
    repeating-linear-gradient(0deg,
      color-mix(in oklab, var(--silk-edge) 6%, transparent) 0 1px,
      transparent 1px 5px),
    linear-gradient(180deg,
      color-mix(in oklab, var(--paper) 96%, white 4%),
      color-mix(in oklab, var(--paper) 90%, var(--silk) 8%));
  box-shadow: inset 0 0 36px color-mix(in oklab, var(--silk) 14%, transparent);
  cursor: grab;
  scrollbar-color: var(--silk-edge) transparent;
}
.emaki-viewport.is-dragging { cursor: grabbing; user-select: none; }
.emaki-viewport:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.emaki-viewport::-webkit-scrollbar { height: 10px; }
.emaki-viewport::-webkit-scrollbar-thumb {
  background: color-mix(in oklab, var(--silk-edge) 70%, transparent);
  border-radius: 999px;
}
.emaki-strip {
  display: block;
  height: clamp(220px, 30vw, 300px);
  width: 1640px;          /* intrinsic horizontal scroll length */
  max-width: none;
}
/* paper roller edges flanking the open handscroll (decorative) */
.emaki-edge {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 14px;
  pointer-events: none;
  z-index: 2;
}
.emaki-edge-l {
  left: 0;
  background: linear-gradient(90deg,
    color-mix(in oklab, var(--silk) 60%, transparent), transparent);
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}
.emaki-edge-r {
  right: 0;
  background: linear-gradient(270deg,
    color-mix(in oklab, var(--silk) 60%, transparent), transparent);
  border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
}
.emaki figcaption {
  margin-top: var(--space-3);
  font-size: 0.875rem;
  color: var(--ink-muted);
}
.emaki figcaption .emaki-hint {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  margin-top: 2px;
  color: var(--ink-muted);
}

/* the vertical fallback list (always in DOM via JS, shown only narrow).
   Default = hidden on wide screens; the <=640px media query below flips it. */
.emaki-fallback { display: none; margin-top: var(--space-3); }

/* Vertical stacked fallback at <=640px: NO forced horizontal scroll.
   The horizontal SVG strip is removed from layout AND the AT tree; the
   vertical text list (same six scenes, same meaning) takes over. Placed
   AFTER the default rule so the cascade resolves to the narrow behavior. */
@media (max-width: 640px) {
  .emaki-viewport {
    /* fully drop the horizontal handscroll on narrow: no scroll, not a
       focus target, hidden from AT — the vertical fallback replaces it. */
    display: none;
  }
  .emaki-edge { display: none; }
  .emaki-fallback { display: block; }
}
.emaki-fallback ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}
.emaki-fallback li {
  display: grid;
  gap: 2px;
  padding: var(--space-3);
  border: 1px solid color-mix(in oklab, var(--silk-edge) 40%, transparent);
  border-left: 3px solid var(--seal);
  border-radius: var(--radius);
  background: color-mix(in oklab, var(--paper-deep) 88%, white 4%);
}
.emaki-fallback .ef-step {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--seal-text);
}
.emaki-fallback .ef-title { font-family: var(--font-display); font-weight: 600; color: var(--ink); }
.emaki-fallback .ef-sub { font-family: var(--font-mono); font-size: 0.8125rem; color: var(--ink-muted); }

/* =========================================================================
 * 印章 verified seal as the "generated/verified" badge on idea cards
 * ========================================================================= */
.idea-card { position: relative; }
.idea-card .idea-seal {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  z-index: 1;
}
.idea-card .idea-seal .seal-stamp {
  width: 40px; height: 40px; padding: 4px;
  /* slight authentic tilt of a hand-pressed seal */
  transform: rotate(-5deg);
}
.idea-card .idea-seal .seal-stamp svg { width: 32px; height: 32px; }
/* the badge is INFORMATIONAL here, so it carries a visible text label too —
   meaning is not conveyed by the red seal color alone. */
.idea-card .idea-seal .seal-label {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--seal-text);
  white-space: nowrap;
}
@media (max-width: 480px) {
  .idea-card .idea-seal .seal-label { display: none; }
  .idea-card .idea-head { padding-right: 48px; }
}

/* Keep the existing ryumu mist subtle behind the paper scroll so the scroll
   reads as the figure and the steel-blue mist as the ground. */
.scroll-mount { /* paper sits above the fixed mist layers via z-index:1 */ }