/* ============================================================
   PATROL-01 — Brockhall Village Autonomous Watch
   Aesthetic: command console for an autonomous patrol unit.
   Palette: midnight navy + single sodium-streetlight amber accent.
   Type: Chakra Petch (display) · IBM Plex Sans (body) · Plex Mono (data)
   ============================================================ */

:root {
  --midnight: #0a0f1e;
  --deck:     #121a2e;
  --deck-2:   #18223a;
  --signal:   #ffa033;   /* sodium streetlight amber — the one accent */
  --signal-soft: #ffbe6b;
  --signal-glow: rgba(255, 160, 51, .35);
  --frost:    #eaf0fb;
  --mute:     #8493ad;
  --line:     rgba(234, 240, 251, .10);
  --line-2:   rgba(234, 240, 251, .18);

  --display: 'Chakra Petch', system-ui, sans-serif;
  --body:    'IBM Plex Sans', system-ui, sans-serif;
  --mono:    'IBM Plex Mono', ui-monospace, monospace;

  --radius: 4px;     /* hard, instrument-panel corners */
  --maxw: 1140px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; overflow-x: hidden; }
body { overflow-x: hidden; }

body {
  font-family: var(--body);
  background: var(--midnight);
  color: var(--frost);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  /* faint instrument grid */
  background-image:
    linear-gradient(rgba(255,255,255,.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.015) 1px, transparent 1px);
  background-size: 44px 44px;
}

.container { width: min(var(--maxw), 92vw); margin-inline: auto; }

h1, h2, h3 { font-family: var(--display); color: var(--frost); line-height: 1.1; font-weight: 700; }
a { color: var(--signal); text-decoration: none; }
b, strong { color: var(--frost); }

/* ───────────── Buttons ───────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-weight: 500; font-size: .9rem;
  letter-spacing: .04em; text-transform: uppercase;
  padding: .85rem 1.6rem; border-radius: var(--radius);
  border: 1px solid transparent; cursor: pointer;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
}
.btn-signal { background: var(--signal); color: #1a1003; border-color: var(--signal); box-shadow: 0 0 0 0 var(--signal-glow); }
.btn-signal:hover { background: var(--signal-soft); box-shadow: 0 0 26px var(--signal-glow); transform: translateY(-2px); }
.btn-line { background: transparent; color: var(--frost); border-color: var(--line-2); }
.btn-line:hover { border-color: var(--signal); color: var(--signal-soft); transform: translateY(-2px); }
.btn-sm { padding: .55rem 1rem; font-size: .78rem; }
.btn-lg { padding: 1rem 2.1rem; font-size: .95rem; }

/* ───────────── Proposal banner ───────────── */
.topbar { background: var(--signal); color: #1a1003; font-family: var(--mono); font-size: .82rem; letter-spacing: .02em; }
.topbar-inner { display: flex; align-items: center; justify-content: center; gap: .7rem; padding: .55rem 0; text-align: center; flex-wrap: wrap; }
.topbar-tag { font-weight: 600; letter-spacing: .14em; border: 1px solid rgba(26,16,3,.45); padding: .12rem .55rem; border-radius: 2px; }
.topbar b { font-weight: 700; }

/* ───────────── HUD bars (header / footer) ───────────── */
.hud-bar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10, 15, 30, .82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.hud-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: .7rem 0; }
.unit-id {
  display: inline-flex; align-items: center; gap: .55rem;
  font-family: var(--display); font-weight: 700; font-size: 1.05rem;
  letter-spacing: .06em; color: var(--frost);
}
.unit-glyph { width: 10px; height: 10px; background: var(--signal); border-radius: 1px; box-shadow: 0 0 10px var(--signal-glow); }
.unit-sub { font-family: var(--mono); font-weight: 400; font-size: .72rem; color: var(--mute); letter-spacing: .1em; }
.hud-meta { display: flex; align-items: center; gap: 1rem; }
.hud-coord { font-family: var(--mono); font-size: .74rem; color: var(--mute); letter-spacing: .06em; }
.status-pill {
  display: inline-flex; align-items: center; gap: .45rem;
  font-family: var(--mono); font-size: .72rem; letter-spacing: .08em;
  color: var(--signal-soft); border: 1px solid var(--line-2);
  padding: .32rem .7rem; border-radius: 999px;
}
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 8px var(--signal); animation: blink 2.2s ease-in-out infinite; }
.dot-amber { background: var(--signal); }
@keyframes blink { 0%,100% { opacity: 1 } 50% { opacity: .25 } }

.hud-foot { position: static; border-bottom: none; border-top: 1px solid var(--line); margin-top: 0; }
.unit-id-foot { font-family: var(--display); font-weight: 600; letter-spacing: .06em; font-size: .9rem; color: var(--mute); }

/* ───────────── Hero ───────────── */
.hero { padding: clamp(2.5rem, 6vw, 5.5rem) 0; position: relative; overflow: hidden; }
.hero::before {
  content: ''; position: absolute; inset: 0;
  background: radial-gradient(900px 480px at 78% 12%, var(--signal-glow), transparent 60%);
  opacity: .5; pointer-events: none;
}
.hero-inner { position: relative; display: grid; grid-template-columns: 1.05fr .95fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }

.eyebrow { font-family: var(--mono); font-size: .76rem; letter-spacing: .14em; color: var(--signal); margin-bottom: 1.2rem; }
.hero h1 { font-size: clamp(2.3rem, 5.2vw, 3.7rem); letter-spacing: .01em; margin-bottom: 1.2rem; }
.hl { color: var(--signal); text-shadow: 0 0 30px var(--signal-glow); }
.lede { font-size: clamp(1.02rem, 1.5vw, 1.18rem); color: #c4cfe2; max-width: 48ch; margin-bottom: 2rem; }

/* Deployment charge gauge */
.gauge {
  background: linear-gradient(180deg, var(--deck), var(--midnight));
  border: 1px solid var(--line-2); border-radius: var(--radius);
  padding: 1.25rem 1.4rem; margin-bottom: 2rem;
  box-shadow: inset 0 1px 0 rgba(255,255,255,.04);
}
.gauge-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: .7rem; }
.gauge-label { font-family: var(--mono); font-size: .74rem; letter-spacing: .14em; color: var(--mute); }
.gauge-pct { font-family: var(--display); font-weight: 700; font-size: 1.15rem; color: var(--signal); }
.progress-bar { position: relative; height: 16px; background: #0c1426; border: 1px solid var(--line); border-radius: 2px; overflow: hidden; }
.progress-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, #c9701a, var(--signal) 70%, var(--signal-soft));
  box-shadow: 0 0 18px var(--signal-glow); transition: width 1.2s cubic-bezier(.22,1,.36,1);
}
.gauge-ticks { position: absolute; inset: 0; background-image: repeating-linear-gradient(90deg, transparent 0 calc(10% - 1px), rgba(10,15,30,.7) calc(10% - 1px) 10%); pointer-events: none; }
.gauge-readout { display: flex; justify-content: space-between; align-items: flex-end; margin-top: .9rem; gap: 1rem; }
.readout-right { text-align: right; }
.readout-num { display: block; font-family: var(--display); font-weight: 700; font-size: 1.85rem; line-height: 1; }
.readout-sub { font-family: var(--mono); font-size: .74rem; color: var(--mute); }

.hero-actions { display: flex; gap: .8rem; flex-wrap: wrap; }

/* ───── Radar scope (signature) ───── */
.scope-wrap { margin: 0; }
.scope { position: relative; aspect-ratio: 1; width: 100%; max-width: 440px; margin-inline: auto; padding: 18px; }
.scope-face {
  position: absolute; inset: 18px; border-radius: 50%;
  background:
    radial-gradient(circle at 50% 50%, rgba(255,160,51,.06), transparent 70%),
    radial-gradient(circle at 50% 50%, var(--deck), var(--midnight));
  border: 1px solid var(--line-2);
  overflow: hidden;
  box-shadow: 0 0 60px rgba(0,0,0,.6), inset 0 0 40px rgba(0,0,0,.5);
}
.estate-map { position: absolute; inset: 0; width: 100%; height: 100%; opacity: .55; }
.estate-map .road { fill: none; stroke: rgba(255,160,51,.35); stroke-width: 1.4; stroke-linecap: round; }
.estate-map .houses rect { fill: none; stroke: rgba(234,240,251,.28); stroke-width: 1; }
.ring { position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%); border: 1px solid rgba(255,160,51,.16); border-radius: 50%; }
.ring.r1 { width: 32%; height: 32%; }
.ring.r2 { width: 62%; height: 62%; }
.ring.r3 { width: 92%; height: 92%; }
.crosshair { position: absolute; inset: 0; background: linear-gradient(rgba(255,160,51,.14), rgba(255,160,51,.14)) center/1px 100% no-repeat, linear-gradient(rgba(255,160,51,.14), rgba(255,160,51,.14)) center/100% 1px no-repeat; }
.sweep {
  position: absolute; inset: 0; border-radius: 50%;
  background: conic-gradient(from 0deg, rgba(255,160,51,0) 0deg, rgba(255,160,51,0) 290deg, rgba(255,160,51,.10) 340deg, rgba(255,160,51,.5) 359deg, rgba(255,160,51,.6) 360deg);
  animation: sweep 4.5s linear infinite;
}
@keyframes sweep { to { transform: rotate(360deg); } }
.blip { position: absolute; width: 8px; height: 8px; margin: -4px 0 0 -4px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 10px var(--signal); animation: blip 4.5s ease-out infinite; opacity: 0; }
.blip:nth-of-type(2) { animation-delay: 1.4s; }
.blip:nth-of-type(3) { animation-delay: 2.7s; }
@keyframes blip { 0% { opacity: 0; transform: scale(.4); } 8% { opacity: 1; transform: scale(1); } 55% { opacity: .5; } 100% { opacity: 0; transform: scale(1.4); } }
.unit-marker { position: absolute; top: 50%; left: 50%; width: 16px; height: 16px; margin: -8px 0 0 -8px; transform: rotate(45deg); border: 1px solid var(--signal); display: grid; place-items: center; }
.unit-marker-core { width: 6px; height: 6px; background: var(--signal); box-shadow: 0 0 12px var(--signal); animation: blink 1.6s ease-in-out infinite; }

/* corner brackets (shared by scope + feed) */
.bracket { position: absolute; width: 16px; height: 16px; border: 1px solid var(--signal); opacity: .7; }
.bracket.tl { top: 0; left: 0; border-right: none; border-bottom: none; }
.bracket.tr { top: 0; right: 0; border-left: none; border-bottom: none; }
.bracket.bl { bottom: 0; left: 0; border-right: none; border-top: none; }
.bracket.br { bottom: 0; right: 0; border-left: none; border-top: none; }

.telemetry { display: grid; grid-template-columns: repeat(2, 1fr); gap: .4rem 1.2rem; max-width: 440px; margin: 1.2rem auto 0; }
.telemetry span { font-family: var(--mono); font-size: .76rem; color: var(--frost); display: flex; gap: .5rem; }
.telemetry b { color: var(--mute); font-weight: 500; min-width: 3.2em; }

/* ───────────── Concept visualisation ───────────── */
.concept { padding: 0 0 clamp(2.5rem, 6vw, 4rem); }
.concept-frame { position: relative; margin: 0; padding: 14px; border: 1px solid var(--line-2); border-radius: var(--radius); background: var(--deck); overflow: hidden; }
.concept-frame img { display: block; width: 100%; height: clamp(260px, 46vw, 560px); object-fit: cover; object-position: center 40%; border-radius: 2px; filter: saturate(.96) contrast(1.02); }
.concept-tag { position: absolute; top: 22px; left: 22px; z-index: 2; font-family: var(--mono); font-size: .72rem; letter-spacing: .14em; color: var(--frost); background: rgba(10,15,30,.7); border: 1px solid var(--line-2); padding: .35rem .7rem; border-radius: 2px; backdrop-filter: blur(4px); }
.concept-frame figcaption { font-family: var(--mono); font-size: .76rem; color: var(--mute); padding: .8rem .4rem 0; }

/* ───────────── Hero image (on the estate) ───────────── */
.hero-media { margin: 0; }
.hero-media-frame { position: relative; padding: 12px; border: 1px solid var(--line-2); border-radius: var(--radius); background: var(--deck); overflow: hidden; box-shadow: 0 0 60px rgba(0,0,0,.5); }
.hero-media-frame img { display: block; width: 100%; height: auto; border-radius: 2px; filter: saturate(.98) contrast(1.02); }

/* ───────────── Mission parameters band ───────────── */
.params { border-block: 1px solid var(--line); background: linear-gradient(180deg, var(--deck), var(--midnight)); }
.params-inner { padding: 2.4rem 0; text-align: center; }
.params-tag { display: inline-block; font-family: var(--mono); font-size: .74rem; letter-spacing: .16em; color: var(--signal); margin-bottom: 1.4rem; }
.equation { display: flex; align-items: center; justify-content: center; gap: clamp(1rem, 4vw, 3rem); flex-wrap: wrap; }
.eq-cell { display: flex; flex-direction: column; align-items: center; }
.eq-cell b { font-family: var(--display); font-weight: 700; font-size: clamp(1.9rem, 4.5vw, 2.8rem); }
.eq-cell small { font-family: var(--mono); font-size: .74rem; color: var(--mute); letter-spacing: .06em; margin-top: .3rem; }
.eq-total b { color: var(--signal); text-shadow: 0 0 26px var(--signal-glow); }
.eq-op { font-family: var(--display); font-size: 1.6rem; color: var(--mute); }

/* ───────────── Section scaffolding ───────────── */
.section-title { font-size: clamp(1.7rem, 3.6vw, 2.3rem); text-align: center; letter-spacing: .01em; }
.section-title-left { text-align: left; }
.section-lede { font-family: var(--body); text-align: center; max-width: 52ch; margin: .7rem auto 0; color: var(--mute); }

/* ───────────── Recon: real unit (video + gallery) ───────────── */
.recon { padding: clamp(3rem, 7vw, 5rem) 0; border-top: 1px solid var(--line); }
.recon .params-tag { margin-bottom: 1rem; }
.recon-lede { text-align: left; margin-left: 0; margin-right: 0; }
.vid-frame { position: relative; margin: 2rem 0 0; padding: 14px; border: 1px solid var(--line-2); border-radius: var(--radius); background: var(--deck); }
.vid-embed { position: relative; aspect-ratio: 16 / 9; border-radius: 2px; overflow: hidden; background: #000; }
.vid-embed iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 1.2rem; }
.shot { position: relative; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--deck); }
.shot img { display: block; width: 100%; height: 200px; object-fit: cover; filter: saturate(.92) contrast(1.02); transition: transform .35s ease; }
.shot:hover img { transform: scale(1.05); }
.shot figcaption { font-family: var(--mono); font-size: .74rem; color: var(--mute); padding: .65rem .8rem; border-top: 1px solid var(--line); }
.recon-credit { font-family: var(--mono); font-size: .72rem; color: var(--mute); margin-top: 1.1rem; }

/* ───────────── Patrol zone (map) ───────────── */
.zone { padding: clamp(3rem, 7vw, 5rem) 0; border-top: 1px solid var(--line); }
.zone .params-tag { margin-bottom: 1rem; }
.zone-frame { position: relative; margin: 2rem 0 0; padding: 14px; border: 1px solid var(--line-2); border-radius: var(--radius); background: var(--deck); }
.zone-map { position: relative; aspect-ratio: 16 / 9; border-radius: 2px; overflow: hidden; background: #000; }
.zone-map iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; filter: saturate(.85) brightness(.92); }
.zone-stats { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem 1.6rem; margin-top: 1.2rem; }
.zone-stats span { font-family: var(--mono); font-size: .78rem; color: var(--frost); }
.zone-stats b { color: var(--mute); font-weight: 500; margin-right: .5rem; }
.zone-link { font-family: var(--mono); font-size: .78rem; margin-left: auto; }

/* ───────────── Deployment sequence ───────────── */
.phases { padding: clamp(3rem, 7vw, 5rem) 0; }
.phase-grid { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; margin-top: 2.8rem; counter-reset: none; }
.phase {
  position: relative; background: var(--deck); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.7rem 1.6rem 1.8rem;
  transition: transform .2s ease, border-color .2s ease;
}
.phase::before { content: ''; position: absolute; top: 0; left: 0; width: 38px; height: 2px; background: var(--signal); box-shadow: 0 0 12px var(--signal-glow); }
.phase:hover { transform: translateY(-4px); border-color: var(--line-2); }
.phase-no { font-family: var(--mono); font-size: .74rem; letter-spacing: .14em; color: var(--signal); }
.phase h3 { font-size: 1.35rem; margin: .6rem 0 .5rem; }
.phase p { color: #c4cfe2; font-size: .98rem; }

/* ───────────── Privacy ───────────── */
.privacy { padding: clamp(3rem, 7vw, 5rem) 0; border-top: 1px solid var(--line); }
.privacy .params-tag { margin-bottom: 1rem; }
.privacy-grid { list-style: none; display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.2rem; margin-top: 2rem; }
.priv { position: relative; background: var(--deck); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.5rem 1.5rem 1.6rem; }
.priv::before { content: ''; position: absolute; top: 0; left: 0; width: 38px; height: 2px; background: var(--signal); box-shadow: 0 0 12px var(--signal-glow); }
.priv h3 { font-size: 1.15rem; margin-bottom: .4rem; }
.priv p { color: #c4cfe2; font-size: .96rem; }

/* WhatsApp contact link */
.wa-link { color: var(--signal); font-weight: 600; white-space: nowrap; }

/* ───────────── Live feed console ───────────── */
.feed { padding: clamp(2rem, 5vw, 4rem) 0 clamp(3rem, 7vw, 5rem); }
.feed-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.5rem; gap: 1rem; flex-wrap: wrap; }
.feed-state { font-family: var(--mono); font-size: .78rem; letter-spacing: .1em; color: var(--signal-soft); display: inline-flex; align-items: center; gap: .5rem; }
.feed-frame { position: relative; aspect-ratio: 16 / 9; max-width: 880px; margin-inline: auto; padding: 14px; border: 1px solid var(--line-2); border-radius: var(--radius); background: var(--deck); }
.feed-inner {
  position: relative; height: 100%; display: grid; place-content: center; text-align: center; gap: .3rem;
  background: repeating-linear-gradient(0deg, #0b1222, #0b1222 2px, #0c1426 2px, #0c1426 4px);
  border-radius: 2px; overflow: hidden;
}
.feed-msg { font-family: var(--display); font-weight: 700; font-size: clamp(1.4rem, 3vw, 2rem); letter-spacing: .12em; color: var(--mute); }
.feed-inner small { font-family: var(--mono); font-size: .78rem; color: var(--mute); }
.scanline { position: absolute; left: 0; right: 0; height: 30%; top: -30%; background: linear-gradient(180deg, transparent, rgba(255,160,51,.07), transparent); animation: scan 5s linear infinite; }
@keyframes scan { to { top: 100%; } }

/* ───────────── Authorise / donate ───────────── */
.authorize {
  position: relative; padding: clamp(3.5rem, 8vw, 6rem) 0; border-top: 1px solid var(--line);
  background:
    linear-gradient(rgba(10,15,30,.82), rgba(10,15,30,.94)),
    radial-gradient(700px 320px at 50% 0%, rgba(255,160,51,.12), transparent 70%),
    url('assets/go2-hero.jpg');
  background-size: cover; background-position: center; background-blend-mode: normal;
}
.authorize-inner { text-align: center; max-width: 640px; margin-inline: auto; }
.authorize .params-tag { margin-bottom: 1rem; }
.authorize-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; margin: 1.8rem 0 1.3rem; }
.authorize-note { font-family: var(--mono); font-size: clamp(1rem, 1.4vw, 1.15rem); line-height: 1.6; color: var(--signal-soft); border: 1px solid rgba(255,160,51,.45); background: rgba(255,160,51,.1); border-radius: var(--radius); padding: 1rem 1.3rem; display: block; max-width: 560px; margin-inline: auto; }
.authorize-note b { color: var(--signal); letter-spacing: .08em; font-size: 1.1em; }
.authorize-note code { background: rgba(255,255,255,.08); padding: .1rem .4rem; border-radius: 3px; color: var(--frost); }

/* ───────────── Query log / FAQ ───────────── */
.log { padding: clamp(3rem, 7vw, 5rem) 0 clamp(4rem, 8vw, 6rem); }
.faq { max-width: 740px; margin: 2.4rem auto 0; display: grid; gap: .7rem; }
.faq details { background: var(--deck); border: 1px solid var(--line); border-radius: var(--radius); padding: 0 1.3rem; }
.faq summary { font-family: var(--display); font-weight: 600; font-size: 1.02rem; color: var(--frost); cursor: pointer; padding: 1rem 0; list-style: none; position: relative; padding-right: 2rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; position: absolute; right: 0; top: 50%; transform: translateY(-50%); color: var(--signal); font-family: var(--mono); font-size: 1.2rem; }
.faq details[open] summary::after { content: '\2212'; }
.faq details p { padding-bottom: 1.1rem; color: #c4cfe2; }

/* ───────────── Accessibility: focus + reduced motion ───────────── */
:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .progress-fill { transition: none; }
  .sweep { background: conic-gradient(from 300deg, rgba(255,160,51,0) 0deg, rgba(255,160,51,.5) 60deg); }
  .blip { opacity: .7; }
}

/* ───────────── Responsive ───────────── */
/* buttons must wrap gracefully now the label is longer */
.btn { white-space: normal; text-align: center; line-height: 1.25; }

@media (max-width: 880px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-media { order: -1; }            /* show the dog first on mobile */
  .phase-grid { grid-template-columns: 1fr; }
  .privacy-grid { grid-template-columns: 1fr; }
  .hud-coord { display: none; }
}
@media (max-width: 560px) {
  .container { width: min(1140px, 87vw); }   /* reduce content width ~5% for narrow phones */
  .gallery { grid-template-columns: 1fr; }
  .shot img { height: 220px; }
  /* header: drop extras and shrink so the FUND button fits */
  .status-pill { display: none; }
  .unit-sub { display: none; }
  .hud-inner { gap: .5rem; }
  .header-inner, .hud-meta { gap: .5rem; }
  .unit-id { font-size: .92rem; letter-spacing: .03em; }
  .brand-mark { font-size: 1.4rem; }
  .btn-sm { font-size: .58rem; padding: .45rem .6rem; letter-spacing: 0; }
  /* proposal banner */
  .topbar { font-size: .72rem; letter-spacing: 0; }
  .topbar-inner { padding: .5rem .2rem; gap: .4rem; }
  .topbar-tag { letter-spacing: .08em; }
  /* visualisation tag on the hero image */
  .concept-tag { font-size: .56rem; letter-spacing: .06em; top: 12px; left: 12px; padding: .25rem .5rem; }
  /* keep section paddings from feeling oversized */
  .eyebrow { font-size: .68rem; letter-spacing: .08em; }
}
@media (max-width: 520px) {
  .gauge-readout { flex-direction: column; align-items: flex-start; gap: .4rem; }
  .readout-right { text-align: left; }
  .equation { gap: 1rem; }
  .zone-link { margin-left: 0; }
  .hero h1 { font-size: clamp(2rem, 8vw, 2.6rem); }
}