/* ==========================================================
   AI Hashira — signals from the age of agents
   Dark void, glass panels, HUD labels, cyan and crimson light.
   ========================================================== */

:root {
  --void: #05070d;
  --void-deep: #020308;
  --text: #e9edf5;
  --body: #c9cfdd;
  --soft: #b7bfd1;
  --muted: #8b93a7;
  --line: rgba(255, 255, 255, 0.10);
  --line-soft: rgba(255, 255, 255, 0.06);
  --glass: rgba(255, 255, 255, 0.04);
  --cyan: #7cf7ff;
  --cyan-soft: rgba(124, 247, 255, 0.12);
  --violet: #a78bfa;
  --pink: #ff8bd1;
  --crimson: #ff3b5c;
  --amber: #ffc46b;
  --lime: #b6ff7c;
  --iridescent: linear-gradient(100deg, #7cf7ff 0%, #a78bfa 50%, #ff8bd1 100%);
  --radius: 20px;
  --max: 1200px;
  --font-display: "Unbounded", "Arial Black", sans-serif;
  --font-sans: "Geist", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-jp: "Noto Sans JP", sans-serif;
  color-scheme: dark;
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(900px 600px at 80% 0%, rgba(124, 247, 255, 0.09), transparent 60%),
    radial-gradient(800px 700px at 0% 30%, rgba(167, 139, 250, 0.08), transparent 60%),
    var(--void);
  background-repeat: no-repeat;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; display: block; }

[hidden] { display: none !important; }

a { color: var(--cyan); text-underline-offset: 3px; }
a:hover { color: #c4fbff; }

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 6px; }

h1, h2, h3 {
  font-family: var(--font-display);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0;
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(255, 255, 255, 0.07);
  padding: 2px 6px;
  border-radius: 6px;
}

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 32px; }

.skip-link {
  position: absolute; left: 16px; top: -60px; z-index: 10;
  padding: 10px 16px; border-radius: 10px;
  background: var(--cyan); color: var(--void); font-weight: 600; text-decoration: none;
}
.skip-link:focus { top: 12px; }

.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;
}

/* ---------- Shared labels ---------- */
.label, .eyebrow, .hud, .mono {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}
.label { font-size: 12px; color: var(--muted); }
.eyebrow { font-size: 13px; color: var(--cyan); letter-spacing: 0.18em; }
.grad-text {
  background: var(--iridescent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- HUD strip ---------- */
.hud {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}
.hud .container { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; padding-top: 8px; padding-bottom: 8px; }
.hud-dot {
  display: inline-block; width: 7px; height: 7px; margin-right: 10px; border-radius: 50%;
  background: var(--cyan); vertical-align: 1px;
  animation: pulse 2.4s ease-in-out infinite;
}

/* ---------- Header ---------- */
.nav { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; padding-top: 22px; padding-bottom: 22px; }

.brand { display: flex; align-items: center; gap: 12px; color: var(--text); text-decoration: none; }
.brand:hover { color: var(--text); }
.brand-logo { width: auto; height: 72px; }
.brand-name { font-family: var(--font-display); font-weight: 600; font-size: 18px; letter-spacing: 0.08em; }

.nav-links {
  list-style: none; margin: 0; padding: 6px;
  display: flex; gap: 4px;
  background: var(--glass); border: 1px solid var(--line); border-radius: 999px;
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
}
.nav-links a {
  display: block; padding: 10px 18px; border-radius: 999px;
  color: var(--text); text-decoration: none; font-size: 15px; font-weight: 500;
}
.nav-links a:hover { background: rgba(255, 255, 255, 0.06); color: var(--text); }
.nav-links a[aria-current="page"] { background: var(--cyan-soft); font-weight: 600; }

/* ---------- Buttons ---------- */
.btn-row { display: flex; flex-wrap: wrap; gap: 14px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 52px; padding: 0 26px; border-radius: 999px;
  font-weight: 600; text-decoration: none; font-size: 16px;
}
.btn-primary { background: var(--cyan); color: var(--void); box-shadow: 0 0 32px rgba(124, 247, 255, 0.35); }
.btn-primary:hover { background: #b5fbff; color: var(--void); }
.btn-ghost { border: 1px solid rgba(255, 255, 255, 0.18); background: rgba(255, 255, 255, 0.03); color: var(--text); font-weight: 500; }
.btn-ghost:hover { border-color: var(--cyan); color: var(--text); }

/* ---------- Glass panels + HUD brackets ---------- */
.glass {
  position: relative;
  background: var(--glass);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
}
.brackets::before, .brackets::after {
  content: ""; position: absolute; width: 18px; height: 18px; pointer-events: none;
}
.brackets::before { top: -6px; left: -6px; border-top: 1px solid var(--cyan); border-left: 1px solid var(--cyan); }
.brackets::after { bottom: -6px; right: -6px; border-bottom: 1px solid var(--cyan); border-right: 1px solid var(--cyan); }

/* ---------- Sections ---------- */
.section { padding: 0 0 96px; }
.section-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 16px; margin-bottom: 32px; }
.section-head .label { display: block; margin-bottom: 10px; letter-spacing: 0.18em; }
.section-head h2 { font-weight: 600; font-size: clamp(28px, 4vw, 40px); }
.section-head p { margin: 0; color: var(--muted); max-width: 26em; }

/* ---------- Hero ---------- */
.hero { padding: 56px 0 88px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 48px; align-items: center; }
.hero .eyebrow { display: block; margin-bottom: 22px; }
.hero h1 { font-weight: 700; font-size: clamp(40px, 6.4vw, 72px); line-height: 1.04; letter-spacing: -0.02em; margin-bottom: 26px; }
.hero .lead { font-size: 20px; color: var(--soft); margin: 0 0 36px; max-width: 30em; }

/* ---------- Hero signal card: the prompt console ---------- */
.hero-signal { padding: 20px; display: flex; flex-direction: column; gap: 22px; }
.hero-signal-foot { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 16px 24px; padding: 0 4px 4px; }
.hero-signal-foot .eyebrow { display: block; margin-bottom: 8px; }
.hero-signal-foot h2 { font-weight: 700; font-size: clamp(24px, 2.6vw, 30px); margin-bottom: 8px; }

.console { margin: 0; background: rgba(2, 3, 8, 0.6); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.console-bar {
  display: flex; justify-content: space-between; padding: 14px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted);
}
.console-bar + .console-bar, .console-response + .console-bar { border-top: 1px solid rgba(255, 255, 255, 0.08); }
.console-text {
  margin: 0; min-height: 150px; padding: 20px;
  font-family: var(--font-mono); font-size: 15px; line-height: 1.75; color: var(--text); white-space: pre-wrap;
}
.cursor {
  display: inline-block; width: 9px; height: 18px; margin-left: 2px; vertical-align: -3px;
  background: var(--cyan); animation: blink 1s steps(1) infinite;
}
.status-live { color: var(--cyan); }
.console-response { min-height: 132px; padding: 4px 20px 20px; }
.resp-rows { margin: 0; padding: 0; list-style: none; font-family: var(--font-mono); font-size: 14px; }
.resp-rows li { display: grid; grid-template-columns: 40px minmax(0, 1fr) 52px; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line-soft); }
.resp-rows li:last-child { border-bottom: 0; }
.resp-rows .n { color: var(--muted); }
.resp-rows .lo { color: var(--cyan); }
.resp-rows .md { color: var(--violet); }
.resp-wait { display: flex; flex-direction: column; gap: 12px; padding-top: 14px; }
.resp-wait span { height: 12px; border-radius: 6px; background: linear-gradient(90deg, rgba(124, 247, 255, 0.25), rgba(167, 139, 250, 0.25)); animation: pulse 1.6s ease-in-out infinite; }
.resp-wait span:nth-child(1) { width: 88%; }
.resp-wait span:nth-child(2) { width: 70%; }
.resp-wait span:nth-child(3) { width: 80%; }

/* ---------- Frequencies ---------- */
.freq-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.freq { display: flex; flex-direction: column; gap: 14px; padding: 28px; }
.freq.is-live { border-color: rgba(124, 247, 255, 0.35); }
.freq-top { display: flex; justify-content: space-between; gap: 12px; }
.freq h3 { font-weight: 600; font-size: 24px; }
.freq p { margin: 0; color: var(--soft); font-size: 16px; }
.freq-foot { margin-top: auto; font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); text-decoration: none; }
a.freq-foot { color: var(--cyan); }
.c-cyan { color: var(--cyan); }
.c-violet { color: var(--violet); }
.c-pink { color: var(--pink); }

/* ---------- Signal log ---------- */
.log { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.log-row {
  display: grid; grid-template-columns: 80px minmax(0, 1fr) 170px 90px 32px; align-items: center; gap: 20px;
  padding: 24px 8px; border-bottom: 1px solid var(--line); color: var(--muted); text-decoration: none;
}
a.log-row { color: var(--text); }
a.log-row:hover { background: rgba(124, 247, 255, 0.04); color: var(--text); }
.log-num { font-family: var(--font-mono); font-size: 15px; }
a.log-row .log-num, .log-arrow { color: var(--cyan); }
.log-title { font-family: var(--font-display); font-weight: 600; font-size: 22px; }
.log-tag { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; }
.log-len { font-family: var(--font-mono); font-size: 13px; }
.log-arrow { font-size: 20px; }
.decoding { font-family: var(--font-mono); font-size: 15px; letter-spacing: 0.06em; display: flex; align-items: center; gap: 14px; }
.decoding::before {
  content: ""; width: min(220px, 40vw); height: 14px; border-radius: 4px; flex: 0 0 auto;
  background: repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.14) 0 10px, transparent 10px 14px);
}

/* ---------- About ---------- */
.about { display: flex; flex-wrap: wrap; align-items: center; gap: 40px 48px; padding: 48px; }
.about > div { flex: 1 1 300px; min-width: 0; }
.about h2 { font-weight: 600; font-size: clamp(26px, 3.4vw, 36px); line-height: 1.2; margin-top: 10px; }
.about p { flex: 1 1 400px; min-width: 0; margin: 0; color: var(--soft); font-size: 18px; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid rgba(255, 255, 255, 0.08); padding: 32px 0; }
.site-footer .container { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; font-size: 14px; color: var(--muted); }
.site-footer p { margin: 0; max-width: 46em; }

/* ==========================================================
   Article (a signal)
   ========================================================== */
.read-progress { position: fixed; top: 0; left: 0; right: 0; z-index: 20; height: 3px; background: rgba(255, 255, 255, 0.06); }
.read-progress span {
  display: block; height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--violet), var(--pink));
  box-shadow: 0 0 12px rgba(124, 247, 255, 0.6);
  transform-origin: left; transform: scaleX(var(--progress, 0));
}

.post-head { padding-top: 32px; padding-bottom: 56px; }
.crumbs { margin-bottom: 28px; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--cyan); }
.post-head .eyebrow { display: block; margin-bottom: 18px; }
.post-head h1 { font-weight: 700; font-size: clamp(40px, 7.4vw, 84px); line-height: 1.02; letter-spacing: -0.02em; margin-bottom: 24px; max-width: 12em; }
.post-head .lead { font-size: 22px; color: var(--soft); margin: 0 0 32px; max-width: 34em; }

.meta-strip { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; }
.meta-strip div { padding: 12px 20px; border-right: 1px solid var(--line); }
.meta-strip div:last-child { border-right: 0; }
.meta-strip dt { color: var(--muted); }
.meta-strip dd { margin: 4px 0 0; color: var(--text); }

.post-grid { display: grid; grid-template-columns: 240px minmax(0, 780px); gap: 64px; align-items: start; padding-bottom: 96px; }

.toc { position: sticky; top: 28px; font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.06em; }
.toc .label { display: block; margin-bottom: 16px; letter-spacing: 0.18em; }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid rgba(255, 255, 255, 0.12); }
.toc a { display: block; margin-left: -1px; padding: 9px 0 9px 18px; border-left: 2px solid transparent; color: var(--muted); text-decoration: none; }
.toc a:hover { color: var(--text); }
.toc a.is-active { border-left-color: var(--cyan); color: var(--text); }

.post-body > section { margin-bottom: 64px; scroll-margin-top: 24px; }
.post-body h2 { font-weight: 600; font-size: clamp(24px, 3vw, 32px); line-height: 1.2; margin: 10px 0 18px; }
.post-body p { margin: 0 0 16px; color: var(--body); font-size: 18px; line-height: 1.7; }

/* Hand it over / keep it yours */
.split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 8px; }
.split-card { padding: 22px 24px; }
.split-card ul { margin: 12px 0 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 10px; font-size: 16px; color: var(--body); }
.split-card li { display: grid; grid-template-columns: 18px minmax(0, 1fr); gap: 8px; }
.split-card li::before { content: "▸"; color: var(--c); }
.split-card.is-fast { --c: var(--cyan); border-color: rgba(124, 247, 255, 0.3); }
.split-card.is-yours { --c: var(--amber); border-color: rgba(255, 196, 107, 0.3); }
.split-card.is-yours .eyebrow { color: var(--amber); }

/* The Acceleration Loop */
.loop { display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 28px; align-items: center; margin-top: 8px; }
.loop-ring { position: relative; width: 100%; max-width: 300px; aspect-ratio: 1; margin: 0 auto; }
.loop-orbit {
  position: absolute; inset: 44px; border-radius: 50%;
  border: 2px dashed rgba(124, 247, 255, 0.35);
  box-shadow: 0 0 40px rgba(124, 247, 255, 0.08) inset;
  animation: orbit 24s linear infinite;
}
.loop-node {
  position: absolute; width: 104px; min-height: 64px; padding: 8px 10px;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  border-radius: 16px; border: 1px solid rgba(255, 255, 255, 0.16); background: rgba(5, 7, 13, 0.92);
  color: var(--text); font-family: var(--font-display); font-weight: 600; font-size: 14px; cursor: pointer;
}
.loop-node span { font-family: var(--font-mono); font-weight: 400; font-size: 11px; letter-spacing: 0.14em; color: var(--muted); }
.loop-node:hover { border-color: rgba(124, 247, 255, 0.5); }
.loop-node[aria-selected="true"] { border-color: var(--cyan); background: rgba(124, 247, 255, 0.12); box-shadow: 0 0 24px rgba(124, 247, 255, 0.3); }
.loop-node[aria-selected="true"] span { color: var(--cyan); }
.n-plan { top: 0; left: 50%; transform: translateX(-50%); }
.n-generate { right: 0; top: 50%; transform: translateY(-50%); }
.n-verify { bottom: 0; left: 50%; transform: translateX(-50%); }
.n-refine { left: 0; top: 50%; transform: translateY(-50%); }
.loop-panels { display: flex; flex-direction: column; gap: 16px; }
.loop-panel { padding: 24px; }
.loop-panel h3 { font-weight: 600; font-size: 22px; margin: 10px 0 10px; }
.loop-panel p { font-size: 16px; }
.loop:not(.is-enhanced) { grid-template-columns: minmax(0, 1fr); }
.loop:not(.is-enhanced) .loop-ring { display: none; }

.prompt-block { position: relative; margin-top: 16px; padding: 16px 18px; border-radius: 14px; border: 1px solid var(--line); background: rgba(2, 3, 8, 0.6); }
.prompt-block .label { display: flex; align-items: center; min-height: 32px; margin-bottom: 8px; padding-right: 96px; }
.prompt-block pre { margin: 0; font-family: var(--font-mono); font-size: 14px; line-height: 1.7; color: var(--text); white-space: pre-wrap; }
.copy-btn {
  position: absolute; top: 14px; right: 14px; min-height: 32px; padding: 0 14px; border-radius: 999px;
  border: 1px solid rgba(124, 247, 255, 0.4); background: rgba(124, 247, 255, 0.08); color: var(--cyan);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; cursor: pointer;
}
.copy-btn:hover { background: rgba(124, 247, 255, 0.18); }
.copy-btn.is-done { border-color: var(--lime); color: var(--lime); }
.code-fix { margin: 0; padding: 12px 14px; border-radius: 10px; border: 1px solid rgba(124, 247, 255, 0.35); background: rgba(2, 3, 8, 0.6); font-family: var(--font-mono); font-size: 14px; color: var(--cyan); white-space: pre-wrap; }

/* Traps */
.traps { margin: 8px 0 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 12px; }
.traps li { padding: 16px 20px; border-radius: 14px; font-size: 16px; color: var(--body); }
.traps strong { color: var(--cyan); font-weight: 600; }

/* Prompt scanner */
.part-chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 16px; }
.part-chip {
  display: inline-flex; align-items: center; gap: 10px; min-height: 44px; padding: 0 16px;
  border-radius: 999px; border: 1px solid rgba(255, 255, 255, 0.14); background: rgba(255, 255, 255, 0.03);
  color: var(--text); font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; cursor: pointer;
}
.part-chip::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--c); }
.part-chip[aria-pressed="true"] { border-color: var(--c); background: rgba(255, 255, 255, 0.10); }

.p-role { --c: var(--cyan); }
.p-context { --c: var(--violet); }
.p-task { --c: var(--pink); }
.p-format { --c: var(--amber); }
.p-constraints { --c: var(--lime); }

.scanner { position: relative; margin: 0; padding: 8px 0; overflow: hidden; }
.scan-line {
  position: absolute; left: 0; right: 0; top: 0; height: 2px; pointer-events: none;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  box-shadow: 0 0 18px var(--cyan);
  animation: scan 3.2s ease-in-out infinite alternate;
}
.part-row { display: grid; grid-template-columns: 130px minmax(0, 1fr); gap: 20px; padding: 16px 24px; border-bottom: 1px solid var(--line-soft); transition: opacity 0.25s ease; }
.part-row:last-of-type { border-bottom: 0; }
.part-row.is-dim { opacity: 0.28; }
.part-name { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--c); padding-top: 3px; }
.part-text { font-family: var(--font-mono); font-size: 15px; color: var(--text); border-left: 2px solid var(--c); padding-left: 14px; }
.part-why { font-size: 15px; color: var(--muted); padding-left: 16px; margin-top: 6px; }

/* Weak vs strong */
.switch { display: inline-flex; gap: 4px; padding: 4px; margin-bottom: 18px; border: 1px solid rgba(255, 255, 255, 0.12); border-radius: 999px; }
.switch button {
  min-height: 44px; padding: 0 22px; border: 0; border-radius: 999px; background: transparent; color: var(--text);
  font-family: var(--font-mono); font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; cursor: pointer;
}
.switch button[aria-pressed="true"][data-mode="weak"] { background: var(--pink); color: var(--void); }
.switch button[aria-pressed="true"][data-mode="strong"] { background: var(--cyan); color: var(--void); }
.compare-set + .compare-set { margin-top: 16px; }
.compare-name { margin: 0 0 10px; }
.compare { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.compare > div { padding: 24px; display: flex; flex-direction: column; gap: 14px; }
.compare pre { margin: 0; font-family: var(--font-mono); font-size: 15px; line-height: 1.7; color: var(--text); white-space: pre-wrap; }
.compare p { margin: 0; font-size: 16px; }
.is-weak .result { border-color: rgba(255, 139, 209, 0.35); --q: var(--pink); }
.is-strong .result { border-color: rgba(124, 247, 255, 0.35); --q: var(--cyan); }
.quality { margin-top: auto; }
.quality-head { display: flex; justify-content: space-between; margin-bottom: 8px; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }
.quality-head strong { color: var(--q); font-weight: 500; }
.quality-bar { height: 6px; border-radius: 3px; background: rgba(255, 255, 255, 0.08); }
.quality-bar span { display: block; height: 100%; border-radius: 3px; background: var(--q); box-shadow: 0 0 12px var(--q); }
.is-weak .quality-bar span { width: 28%; }
.is-strong .quality-bar span { width: 92%; }

.takeaways { padding: 32px; }
.takeaways ol { margin: 14px 0 0; padding-left: 24px; display: flex; flex-direction: column; gap: 10px; font-size: 18px; }

.post-nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 56px; }
.post-nav > * { padding: 22px 24px; border-radius: 16px; }
.post-nav .label { display: block; margin-bottom: 6px; }
.post-nav .is-empty { border: 1px dashed rgba(255, 255, 255, 0.14); color: var(--muted); }
.post-nav .is-next { border: 1px solid var(--line); background: rgba(255, 255, 255, 0.03); text-align: right; color: var(--soft); }

/* 404 */
.lost { min-height: 60vh; display: flex; flex-direction: column; justify-content: center; gap: 20px; padding-top: 64px; padding-bottom: 64px; }
.lost h1 { font-weight: 700; font-size: clamp(40px, 8vw, 88px); }
.lost p { margin: 0; color: var(--soft); font-size: 20px; }

/* ==========================================================
   Break room: API Skyway
   ========================================================== */
.game-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 32px; align-items: start; padding-bottom: 96px; }
.game-panel { padding: 20px; }

.sky-hud { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 12px; margin-bottom: 16px; }
.tank, .sky-stats div { padding: 10px 14px; border: 1px solid var(--line); border-radius: 12px; background: rgba(2, 3, 8, 0.5); }
.tank-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-bottom: 8px; }
.tank-head strong { font-family: var(--font-display); font-weight: 600; font-size: 20px; color: var(--cyan); }
.tank-meter { height: 10px; border-radius: 5px; background: rgba(255, 255, 255, 0.08); overflow: hidden; }
.tank-meter span {
  display: block; height: 100%; border-radius: 5px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  box-shadow: 0 0 12px rgba(124, 247, 255, 0.6);
  transform-origin: left; transform: scaleX(var(--tank, 1)); transition: transform 0.15s linear;
}
.tank.is-low { border-color: rgba(255, 59, 92, 0.5); }
.tank.is-low .tank-head strong { color: var(--crimson); }
.tank.is-low .tank-meter span { background: var(--crimson); box-shadow: 0 0 12px rgba(255, 59, 92, 0.7); animation: pulse 0.8s ease-in-out infinite; }
.heat { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: 10px; margin-top: 10px; }
.heat .label { font-size: 10px; }
.heat-meter { height: 5px; border-radius: 3px; background: rgba(255, 255, 255, 0.08); overflow: hidden; }
.heat-meter span {
  display: block; height: 100%; border-radius: 3px; background: linear-gradient(90deg, var(--amber), var(--crimson));
  transform-origin: left; transform: scaleX(var(--heat, 0)); transition: transform 0.15s linear;
}
.heat.is-ocean .label { color: var(--amber); }
.heat.is-hot .label { color: var(--crimson); }
.heat.is-hot .heat-meter span { box-shadow: 0 0 10px rgba(255, 59, 92, 0.8); animation: pulse 0.5s ease-in-out infinite; }
.sky-stats { margin: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.sky-stats dt { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); }
.sky-stats dd { margin: 2px 0 0; font-family: var(--font-display); font-weight: 600; font-size: 20px; }
.sky-stats .best dd { color: var(--amber); }

.sky-wrap {
  position: relative; width: 100%; aspect-ratio: 16 / 9;
  border: 1px solid rgba(124, 247, 255, 0.25); border-radius: 8px; overflow: hidden; background: var(--void-deep);
  user-select: none; -webkit-user-select: none; -webkit-touch-callout: none;
}
.sky-wrap canvas { display: block; width: 100%; height: 100%; touch-action: none; cursor: pointer; }
.sky-hint { margin: 14px 0 0; text-align: center; }
.sky-banner {
  position: absolute; z-index: 1; top: 12px; left: 50%; transform: translateX(-50%); width: max-content; max-width: calc(100% - 24px);
  margin: 0; padding: 8px 16px; border-radius: 999px; text-align: center;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text); background: rgba(5, 7, 13, 0.85); border: 1px solid rgba(124, 247, 255, 0.5);
  box-shadow: 0 0 18px rgba(124, 247, 255, 0.25); pointer-events: none;
}
.sky-banner.is-warn { border-color: rgba(255, 196, 107, 0.7); color: var(--amber); box-shadow: 0 0 18px rgba(255, 196, 107, 0.25); }
.route { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 12px; color: var(--body); font-size: 15px; }
.route li { display: grid; grid-template-columns: 48px minmax(0, 1fr); gap: 10px; }
.route-time { font-family: var(--font-mono); font-size: 12px; color: var(--cyan); padding-top: 3px; }

.board-overlay {
  position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 14px; padding: 24px; text-align: center;
  background: rgba(2, 3, 8, 0.72); backdrop-filter: blur(3px); -webkit-backdrop-filter: blur(3px);
}
.board-overlay h2 { font-weight: 700; font-size: clamp(24px, 4vw, 40px); }
.board-overlay p { margin: 0; color: var(--soft); max-width: 26em; }
.board-overlay.is-over h2 { color: var(--crimson); text-shadow: 0 0 18px rgba(255, 59, 92, 0.6); }

.game-side { display: flex; flex-direction: column; gap: 20px; }
.game-side .glass { padding: 24px; }
.game-side h2 { font-weight: 600; font-size: 20px; margin: 8px 0 14px; }
.game-side ul { margin: 0; padding: 0; list-style: none; display: flex; flex-direction: column; gap: 12px; color: var(--body); font-size: 16px; }
.game-side li { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 10px; align-items: start; }
.game-side p { margin: 0; color: var(--body); font-size: 16px; }
.dot { width: 12px; height: 12px; margin-top: 6px; border-radius: 3px; }
.dot-car { background: var(--cyan); box-shadow: 0 0 10px var(--cyan); }
.dot-tin { width: 9px; height: 14px; margin-top: 4px; margin-left: 2px; border-radius: 2px; background: linear-gradient(var(--cyan) 0 35%, var(--crimson) 35% 65%, var(--cyan) 65%); box-shadow: 0 0 10px var(--cyan); }
.dot-traffic { background: var(--violet); box-shadow: 0 0 10px var(--violet); }
.dot-bird { background: var(--crimson); transform: rotate(45deg); box-shadow: 0 0 10px var(--crimson); }
.dot-torii { border: 2px solid var(--amber); border-radius: 50%; box-shadow: 0 0 10px var(--amber); }
kbd {
  font-family: var(--font-mono); font-size: 12px; padding: 2px 7px; border-radius: 6px; letter-spacing: 0.04em;
  border: 1px solid rgba(255, 255, 255, 0.18); background: rgba(255, 255, 255, 0.05); color: var(--text); text-transform: none;
}

/* ---------- Motion ---------- */
@keyframes blink { 0%, 49% { opacity: 1; } 50%, 100% { opacity: 0; } }
@keyframes pulse { 0%, 100% { opacity: 0.35; } 50% { opacity: 1; } }
@keyframes scan { from { top: 0; } to { top: calc(100% - 2px); } }
@keyframes orbit { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hud-dot, .cursor, .resp-wait span, .tank.is-low .tank-meter span, .heat.is-hot .heat-meter span {
    animation: none !important; opacity: 1 !important; stroke-dashoffset: 0 !important; transform: none !important;
  }
  .scan-line { display: none; }
  .loop-orbit { animation: none; }
}

/* ==========================================================
   Responsive
   ========================================================== */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); }
  .game-layout { grid-template-columns: minmax(0, 1fr); }
  .freq-grid { grid-template-columns: minmax(0, 1fr); }
  .post-grid { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .toc { position: static; }
  .toc ol { display: flex; flex-wrap: wrap; border-left: 0; gap: 4px 8px; }
  .toc a { margin-left: 0; padding: 8px 12px; border: 1px solid var(--line); border-radius: 999px; }
  .toc a.is-active { border-color: var(--cyan); }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .container { padding: 0 16px; }
  .hud .container span:last-child { display: none; }
  .nav { flex-direction: column; align-items: stretch; gap: 12px; padding-top: 14px; padding-bottom: 14px; }
  .nav-links { display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); border-radius: 16px; padding: 4px; }
  .nav-links li { grid-column: span 2; }
  .nav-links li:nth-child(n+4) { grid-column: span 3; }
  .nav-links a { display: flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 2px; border-radius: 12px; font-size: 14px; }
  .hero { padding: 32px 0 56px; }
  .hero .lead, .post-head .lead { font-size: 18px; }
  .btn-row { flex-direction: column; }
  .btn { width: 100%; }
  .section { padding-bottom: 64px; }
  .about, .takeaways { padding: 24px 20px; }
  .hero-signal { padding: 14px; }
  .sky-hud { grid-template-columns: minmax(0, 1fr); }
  .sky-wrap { aspect-ratio: 1 / 1; }
  .hero-signal-foot .btn { width: auto; }
  .brand-logo { height: 52px; }
  .game-panel { padding: 14px; }
  .freq { padding: 22px; }
  .log-row { grid-template-columns: 48px minmax(0, 1fr); grid-template-areas: "num title" ". tag"; gap: 6px 12px; padding: 18px 4px; }
  .log-num { grid-area: num; }
  .log-title, .decoding { grid-area: title; font-size: 18px; }
  .log-tag { grid-area: tag; }
  .log-len, .log-arrow { display: none; }
  .meta-strip div { padding: 10px 14px; }
  .part-row { grid-template-columns: minmax(0, 1fr); gap: 8px; padding: 14px 16px; }
  .part-name { padding-top: 0; }
  .compare { grid-template-columns: minmax(0, 1fr); }
  .split { grid-template-columns: minmax(0, 1fr); }
  .loop { grid-template-columns: minmax(0, 1fr); }
  .loop-ring { max-width: 280px; }
  .loop-node { width: 96px; }
  .post-nav { grid-template-columns: minmax(0, 1fr); }
  .post-nav .is-next { text-align: left; }
}