/* Rural Broadband UK — topographic-at-dusk design system.
   No external fonts or requests. Motion is subtle and disabled under prefers-reduced-motion. */

:root {
  --paper: #f5f2e9;
  --paper-2: #ece7d9;
  --paper-3: #e2dccb;
  --card: #fbf9f3;
  --ink: #16221b;
  --ink-2: #34433a;
  --muted: #5f6b62;
  --line: #d6cfbc;
  --line-2: #c4bca6;
  --moss: #2c5a44;
  --moss-2: #3d7258;
  --fern: #8db38b;
  --night: #0c1913;
  --night-2: #12251c;
  --night-3: #1a3327;
  --signal: #f0a63a;
  --signal-2: #ffc56b;
  --signal-ink: #8a5208;
  --sky: #d5e4dc;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Charter, "Bitstream Charter", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --wrap: 1180px;
  --read: 44rem;
  --radius: 14px;
  --shadow: 0 1px 0 rgba(22, 34, 27, .04), 0 10px 30px -18px rgba(22, 34, 27, .35);
  --ease: cubic-bezier(.22, .61, .36, 1);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; scroll-padding-top: 5.5rem; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.65 var(--sans);
  font-kerning: normal;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; }
svg.ico, svg.head-art, svg.art, svg.mini { overflow: visible; }
a { color: var(--moss); text-decoration-thickness: 1px; text-underline-offset: .18em; }
a:hover { color: var(--ink); text-decoration-color: var(--signal); text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--signal); outline-offset: 3px; border-radius: 4px; }
::selection { background: var(--signal-2); color: var(--ink); }
.skip { position: absolute; left: 1rem; top: -4rem; z-index: 100; background: var(--ink); color: #fff; padding: .6rem 1rem; border-radius: 8px; }
.skip:focus { top: 1rem; color: #fff; }
.wrap { width: min(100% - 2.5rem, var(--wrap)); margin-inline: auto; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; line-height: 1.18; letter-spacing: -.01em; color: var(--ink); text-wrap: balance; }
h1 { font-size: clamp(2.1rem, 1.4rem + 3vw, 3.6rem); margin: 0 0 1rem; letter-spacing: -.02em; }
h2 { font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2.05rem); margin: 3rem 0 1rem; }
h3 { font-size: 1.25rem; margin: 2rem 0 .6rem; }
p { margin: 0 0 1.1rem; text-wrap: pretty; }

.eyebrow {
  font: 600 .74rem/1.2 var(--mono);
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--moss-2);
  display: inline-flex; align-items: center; gap: .6rem;
  margin: 0 0 1rem;
}
.eyebrow::before { content: ""; width: 1.6rem; height: 1px; background: currentColor; opacity: .7; }

/* ------------------------------------------------------------------ header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(245, 242, 233, .86);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid rgba(196, 188, 166, .55);
}
.site-header.on-dark { background: rgba(12, 25, 19, .72); border-bottom-color: rgba(255, 255, 255, .08); }
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 4.1rem; }
.brand { display: inline-flex; align-items: center; gap: .65rem; text-decoration: none; color: var(--ink); }
.brand:hover { color: var(--ink); }
.brand svg { width: 34px; height: 34px; flex: none; }
.brand-name { font: 600 1.08rem/1 var(--serif); letter-spacing: -.01em; }
.brand-name small { display: block; font: 500 .62rem/1.4 var(--mono); letter-spacing: .16em; text-transform: uppercase; color: var(--muted); margin-top: .2rem; }
.on-dark .brand, .on-dark .brand:hover { color: #f3efe3; }
.on-dark .brand-name small { color: #9fb5a8; }
.nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: .2rem; }
.nav a {
  display: block; padding: .5rem .75rem; border-radius: 999px;
  font-size: .9rem; font-weight: 500; color: var(--ink-2); text-decoration: none;
  transition: background .2s var(--ease), color .2s var(--ease);
}
.nav a:hover { background: var(--paper-3); color: var(--ink); }
.nav a[aria-current="page"] { background: var(--ink); color: var(--paper); }
.on-dark .nav a { color: #d6e0d9; }
.on-dark .nav a:hover { background: rgba(255, 255, 255, .08); color: #fff; }
.on-dark .nav a[aria-current="page"] { background: var(--signal); color: var(--night); }
.nav-toggle { display: none; }

@media (max-width: 960px) {
  .nav-toggle {
    display: inline-flex; align-items: center; gap: .5rem;
    border: 1px solid var(--line-2); background: transparent; color: inherit;
    font: 600 .82rem/1 var(--sans); padding: .55rem .85rem; border-radius: 999px; cursor: pointer;
  }
  .on-dark .nav-toggle { border-color: rgba(255, 255, 255, .22); color: #eef2ec; }
  .nav-toggle .bars { width: 16px; height: 10px; position: relative; display: inline-block; }
  .nav-toggle .bars::before, .nav-toggle .bars::after { content: ""; position: absolute; left: 0; right: 0; height: 2px; background: currentColor; border-radius: 2px; transition: transform .25s var(--ease), top .25s var(--ease); }
  .nav-toggle .bars::before { top: 1px; }
  .nav-toggle .bars::after { top: 7px; }
  .nav-toggle[aria-expanded="true"] .bars::before { top: 4px; transform: rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .bars::after { top: 4px; transform: rotate(-45deg); }
  .nav { position: absolute; left: 0; right: 0; top: 100%; background: var(--paper); border-bottom: 1px solid var(--line); box-shadow: 0 20px 30px -20px rgba(0,0,0,.3); display: none; }
  .on-dark .nav { background: var(--night-2); border-color: rgba(255,255,255,.08); }
  .nav.open { display: block; }
  .nav ul { flex-direction: column; padding: .75rem 1.25rem 1.25rem; gap: .15rem; }
  .nav a { padding: .8rem 1rem; border-radius: 10px; font-size: 1rem; }
}

/* reading progress — the "light in the fibre" */
.progress { position: absolute; left: 0; bottom: -1px; height: 2px; width: 100%; transform-origin: 0 50%; transform: scaleX(var(--p, 0)); background: linear-gradient(90deg, rgba(240,166,58,.2), var(--signal) 85%, #fff3d6); pointer-events: none; }
.progress::after { content: ""; position: absolute; right: -3px; top: -2px; width: 6px; height: 6px; border-radius: 50%; background: #fff3d6; box-shadow: 0 0 10px 3px rgba(240,166,58,.85); opacity: var(--glow, 0); }

/* ------------------------------------------------------------------ buttons */
.btn {
  display: inline-flex; align-items: center; gap: .6rem;
  padding: .85rem 1.25rem; border-radius: 999px;
  font: 600 .95rem/1 var(--sans); text-decoration: none;
  transition: transform .2s var(--ease), background .2s var(--ease), box-shadow .2s var(--ease), color .2s;
}
.btn svg { width: 18px; height: 18px; transition: transform .25s var(--ease); }
.btn:hover svg { transform: translateX(3px); }
.btn-primary { background: var(--signal); color: var(--night); box-shadow: 0 0 0 0 rgba(240,166,58,.0), 0 8px 24px -10px rgba(240,166,58,.7); }
.btn-primary:hover { background: var(--signal-2); color: var(--night); transform: translateY(-1px); }
.btn-ghost { color: #e9efe9; border: 1px solid rgba(255,255,255,.25); }
.btn-ghost:hover { color: #fff; background: rgba(255,255,255,.07); border-color: rgba(255,255,255,.45); }
.btn-dark { background: var(--ink); color: var(--paper); }
.btn-dark:hover { background: var(--moss); color: #fff; }

/* ------------------------------------------------------------------ hero (home) */
.hero {
  position: relative; overflow: hidden; isolation: isolate;
  background:
    radial-gradient(1200px 500px at 78% -10%, rgba(240,166,58,.13), transparent 60%),
    radial-gradient(900px 600px at 10% 10%, rgba(141,179,139,.10), transparent 60%),
    linear-gradient(180deg, var(--night) 0%, var(--night-2) 55%, var(--night-3) 100%);
  color: #e8eee8;
  margin-top: -4.1rem; padding-top: 4.1rem;
}
.hero-inner { position: relative; z-index: 2; padding: clamp(3.5rem, 8vw, 7rem) 0 clamp(11rem, 26vw, 19rem); max-width: 46rem; }
.hero .eyebrow { color: var(--signal-2); }
.hero h1 { color: #f6f2e6; font-size: clamp(2.4rem, 1.5rem + 4vw, 4.4rem); line-height: 1.04; }
.hero h1 em { font-style: italic; color: var(--signal-2); font-weight: 500; }
.hero-lede { font-size: clamp(1.05rem, 1rem + .35vw, 1.25rem); color: #c3d0c7; max-width: 38rem; margin-bottom: 2rem; }
.hero-cta { display: flex; flex-wrap: wrap; gap: .75rem; }
.hero-meta { margin-top: 2.2rem; display: flex; flex-wrap: wrap; gap: .5rem 1.4rem; font: 500 .74rem/1.4 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: #8fa699; }
.hero-meta span { display: inline-flex; align-items: center; gap: .45rem; }
.hero-meta span::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--fern); box-shadow: 0 0 0 3px rgba(141,179,139,.18); }
.landscape { position: absolute; inset: auto 0 0 0; width: 100%; height: clamp(240px, 38vw, 520px); z-index: 1; display: block; }
.landscape .contour { fill: none; stroke: rgba(196, 224, 205, .12); stroke-width: 1; }
.landscape .contour.strong { stroke: rgba(196, 224, 205, .2); }
.landscape .route { fill: none; stroke: rgba(240,166,58,.28); stroke-width: 1.4; stroke-dasharray: 2 5; }
.landscape .pulse { fill: none; stroke: var(--signal-2); stroke-width: 2.4; stroke-linecap: round; stroke-dasharray: 10 900; filter: url(#glow); }
.landscape .star { fill: #f3f0e1; }
.landscape .window { fill: var(--signal-2); }
.landscape .orbit { fill: none; stroke: rgba(213, 228, 220, .14); stroke-width: 1; stroke-dasharray: 1 6; }
.landscape .ring { fill: none; stroke: rgba(255, 197, 107, .55); stroke-width: 1.4; }
.landscape .beam { stroke: rgba(255,197,107,.35); stroke-width: 1; stroke-dasharray: 3 6; }

@media (prefers-reduced-motion: no-preference) {
  .landscape .pulse { animation: travel 9s linear infinite; }
  .landscape .pulse.p2 { animation-delay: -3s; }
  .landscape .pulse.p3 { animation-delay: -6s; }
  .landscape .star { animation: twinkle 5s ease-in-out infinite; }
  .landscape .star:nth-of-type(3n) { animation-delay: -1.7s; animation-duration: 7s; }
  .landscape .star:nth-of-type(4n) { animation-delay: -3.1s; }
  .landscape .window { animation: window 11s ease-in-out infinite; }
  .landscape .window:nth-of-type(2n) { animation-delay: -4s; }
  .landscape .ring { transform-box: fill-box; transform-origin: 50% 100%; animation: ring 3.6s var(--ease) infinite; opacity: 0; }
  .landscape .ring.r2 { animation-delay: 1.2s; }
  .landscape .ring.r3 { animation-delay: 2.4s; }
  .landscape .sat { animation: orbit 46s linear infinite; transform-origin: 720px 1650px; transform-box: view-box; }
  .landscape .beam { animation: beam 46s linear infinite; }
}
@keyframes travel { from { stroke-dashoffset: 910; } to { stroke-dashoffset: 0; } }
@keyframes twinkle { 0%, 100% { opacity: .85; } 50% { opacity: .25; } }
@keyframes window { 0%, 100% { opacity: 1; } 48% { opacity: 1; } 52% { opacity: .35; } 60% { opacity: 1; } }
@keyframes ring { 0% { opacity: 0; transform: scale(.4); } 20% { opacity: .9; } 100% { opacity: 0; transform: scale(1.6); } }
@keyframes orbit { from { transform: rotate(-28deg); } to { transform: rotate(28deg); } }
@keyframes beam { 0%, 38% { opacity: 0; } 46%, 54% { opacity: 1; } 62%, 100% { opacity: 0; } }

/* ------------------------------------------------------------------ sections */
.section { padding: clamp(4rem, 8vw, 6.5rem) 0; position: relative; }
.section-head { display: grid; gap: .25rem; max-width: 44rem; margin-bottom: 2.5rem; }
.section-head h2 { margin: 0 0 .6rem; }
.section-head p { color: var(--ink-2); font-size: 1.08rem; margin: 0; }
.section.alt { background: var(--paper-2); }
.section.topo::before {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='640' height='420' viewBox='0 0 640 420'%3E%3Cg fill='none' stroke='%23c9c1aa' stroke-width='1'%3E%3Cpath d='M-20 300c80-40 140-30 200 0s140 40 220-10 160-50 260-10'/%3E%3Cpath d='M-20 330c80-35 150-25 210 5s140 35 220-10 160-45 250-5'/%3E%3Cpath d='M-20 270c90-50 140-45 200-12s130 42 210-12 170-60 270-20'/%3E%3Cpath d='M120 140c40-40 120-50 170-10s20 90-50 100-160-40-120-90z'/%3E%3Cpath d='M150 145c30-25 95-30 125-5s10 60-40 66-115-30-85-61z'/%3E%3Cpath d='M180 150c20-12 60-14 78 0s4 34-26 38-70-18-52-38z'/%3E%3Cpath d='M420 90c50-30 130-20 150 20s-30 80-100 70-110-60-50-90z'/%3E%3Cpath d='M450 100c30-16 85-10 98 14s-20 50-64 44-70-38-34-58z'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 640px 420px;
  mask-image: linear-gradient(180deg, transparent, #000 25%, #000 75%, transparent);
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 25%, #000 75%, transparent);
}
.section > .wrap { position: relative; }

/* stats / visualisations */
.stats { display: grid; grid-template-columns: 1.25fr 1fr; gap: 1.25rem; }
.panel { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: clamp(1.25rem, 3vw, 2rem); box-shadow: var(--shadow); }
.panel h3 { margin: 0 0 .4rem; font-size: 1.3rem; }
.panel .note { font-size: .86rem; color: var(--muted); margin: 1rem 0 0; }
.panel .note a { color: var(--muted); }
.figure-num { font: 600 clamp(2.4rem, 1.6rem + 3vw, 3.6rem)/1 var(--serif); letter-spacing: -.03em; color: var(--ink); }
.figure-num .unit { font-size: .5em; color: var(--muted); margin-left: .1em; }
.homes { display: grid; grid-template-columns: repeat(20, 1fr); gap: 5px; margin: 1.4rem 0 1rem; }
.homes i { aspect-ratio: 1; border-radius: 50%; background: var(--paper-3); display: block; transition: background .5s var(--ease), box-shadow .5s var(--ease), transform .5s var(--ease); transition-delay: calc(var(--i) * 9ms); }
.homes.on i.g { background: var(--signal); box-shadow: 0 0 0 2px rgba(240,166,58,.14); }
.homes.on i.p { background: transparent; box-shadow: inset 0 0 0 1.5px var(--moss-2); }
.legend { display: flex; flex-wrap: wrap; gap: .5rem 1.25rem; font-size: .86rem; color: var(--ink-2); margin: 0; padding: 0; list-style: none; }
.legend li { display: inline-flex; align-items: center; gap: .5rem; }
.legend i { width: 11px; height: 11px; border-radius: 50%; display: inline-block; }
.legend .g { background: var(--signal); }
.legend .p { box-shadow: inset 0 0 0 1.5px var(--moss-2); }
.legend .n { background: var(--paper-3); }
.bars { display: grid; gap: 1.1rem; margin-top: 1.3rem; }
.bar-row { display: grid; gap: .4rem; }
.bar-label { display: flex; justify-content: space-between; gap: 1rem; font-size: .9rem; color: var(--ink-2); }
.bar-label strong { font: 600 1rem/1.2 var(--mono); color: var(--ink); white-space: nowrap; }
.bar { height: 12px; border-radius: 999px; background: var(--paper-3); overflow: hidden; }
.bar span { display: block; height: 100%; width: var(--w); border-radius: inherit; background: linear-gradient(90deg, var(--moss), var(--moss-2)); transform-origin: 0 50%; transform: scaleX(0); transition: transform 1.4s var(--ease); }
.bar.amber span { background: linear-gradient(90deg, #d98b1d, var(--signal)); }
.reveal.on .bar span, .no-js .bar span { transform: scaleX(1); }

/* timeline */
.timeline { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, 1fr); position: relative; gap: 1rem; }
.timeline::before { content: ""; position: absolute; left: 0; right: 0; top: 11px; height: 2px; background: repeating-linear-gradient(90deg, var(--line-2) 0 6px, transparent 6px 11px); }
.timeline::after { content: ""; position: absolute; left: 0; top: 10px; width: 80px; height: 4px; border-radius: 4px; background: linear-gradient(90deg, transparent, var(--signal)); opacity: 0; }
@media (prefers-reduced-motion: no-preference) { .reveal.on .timeline::after { animation: line-run 6s var(--ease) infinite; } }
@keyframes line-run { 0% { left: 0; opacity: 0; } 10% { opacity: 1; } 90% { opacity: 1; } 100% { left: calc(100% - 80px); opacity: 0; } }
.timeline li { position: relative; padding-top: 2.2rem; }
.timeline li::before { content: ""; position: absolute; top: 4px; left: 0; width: 16px; height: 16px; border-radius: 50%; background: var(--paper); border: 2px solid var(--moss-2); }
.timeline li.past::before { background: var(--moss-2); }
.timeline li.soon::before { border-color: var(--signal); background: var(--signal); box-shadow: 0 0 0 5px rgba(240,166,58,.2); }
.timeline time { font: 600 .78rem/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--moss); display: block; margin-bottom: .35rem; }
.timeline p { font-size: .94rem; margin: 0; color: var(--ink-2); }
.timeline a { font-size: .88rem; }

/* option cards */
.options { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
.option {
  position: relative; display: flex; flex-direction: column;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.4rem 1.4rem 1.2rem;
  text-decoration: none; color: inherit; overflow: hidden;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.option::after { content: ""; position: absolute; left: 0; top: 0; height: 3px; width: 100%; background: linear-gradient(90deg, var(--signal), transparent); transform: scaleX(0); transform-origin: 0 50%; transition: transform .5s var(--ease); }
.option:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--line-2); color: inherit; }
.option:hover::after { transform: scaleX(1); }
.option .ico { width: 46px; height: 46px; color: var(--moss); margin-bottom: 1rem; }
.option h3 { margin: 0 0 .35rem; font-size: 1.22rem; }
.option p { font-size: .95rem; color: var(--ink-2); margin-bottom: 1rem; }
.option dl { margin: auto 0 0; display: grid; grid-template-columns: auto 1fr; gap: .35rem .9rem; font-size: .85rem; border-top: 1px dashed var(--line-2); padding-top: .9rem; }
.option dt { font: 600 .68rem/1.6 var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.option dd { margin: 0; color: var(--ink); }
.lat { display: inline-flex; gap: 3px; vertical-align: middle; margin-right: .4rem; }
.lat i { width: 7px; height: 7px; border-radius: 2px; background: var(--paper-3); }
.lat i.on { background: var(--moss-2); }
.lat.hi i.on { background: #c2621f; }
.option .go { margin-top: 1rem; font: 600 .85rem/1 var(--sans); color: var(--moss); display: inline-flex; align-items: center; gap: .4rem; }
.option .go svg { width: 15px; height: 15px; transition: transform .25s var(--ease); }
.option:hover .go svg { transform: translateX(3px); }
.options-note { font-size: .86rem; color: var(--muted); margin-top: 1.2rem; max-width: 56rem; }

@media (prefers-reduced-motion: no-preference) {
  .ico .sig { animation: sig 2.8s ease-in-out infinite; }
  .ico .sig.s2 { animation-delay: .35s; }
  .ico .sig.s3 { animation-delay: .7s; }
  .ico .flow { stroke-dasharray: 3 9; animation: flow 1.6s linear infinite; }
  .ico .spin { transform-box: view-box; transform-origin: 24px 24px; animation: spin 18s linear infinite; }
}
@keyframes sig { 0%, 100% { opacity: .25; } 50% { opacity: 1; } }
@keyframes flow { to { stroke-dashoffset: -24; } }
@keyframes spin { to { transform: rotate(360deg); } }

/* route / decision path */
.route-steps { list-style: none; margin: 0; padding: 0; counter-reset: step; display: grid; gap: 0; max-width: 52rem; }
.route-steps li { position: relative; padding: 0 0 2rem 3.6rem; counter-increment: step; }
.route-steps li:last-child { padding-bottom: 0; }
.route-steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute; left: 0; top: -.15rem; width: 2.4rem; height: 2.4rem; border-radius: 50%;
  display: grid; place-items: center; font: 600 .78rem/1 var(--mono);
  background: var(--ink); color: var(--paper); z-index: 1;
}
.route-steps li::after { content: ""; position: absolute; left: calc(1.2rem - 1px); top: 2.4rem; bottom: .2rem; width: 2px; background: linear-gradient(var(--line-2) 50%, transparent 50%) 0 0 / 2px 8px; }
.route-steps li:last-child::after { display: none; }
.route-steps h3 { margin: 0 0 .3rem; font-size: 1.18rem; }
.route-steps p { margin: 0; color: var(--ink-2); }
.route-steps .then { display: inline-flex; align-items: center; gap: .4rem; margin-top: .5rem; font-weight: 600; font-size: .92rem; }
.route-steps .then::before { content: "→"; color: var(--signal-ink); }

/* checkers */
.checkers { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1rem; counter-reset: chk; }
.checker { position: relative; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.25rem 1.25rem 1.25rem 4.2rem; counter-increment: chk; }
.checker::before { content: counter(chk); position: absolute; left: 1.2rem; top: 1.2rem; width: 2rem; height: 2rem; border-radius: 50%; display: grid; place-items: center; font: 600 .9rem/1 var(--mono); color: var(--signal-ink); background: #fbe7c4; }
.checker h3 { margin: 0 0 .3rem; font-size: 1.08rem; font-family: var(--sans); font-weight: 650; letter-spacing: 0; }
.checker p { margin: 0; font-size: .93rem; color: var(--ink-2); }

/* guide cards */
.guides { display: grid; grid-template-columns: repeat(6, 1fr); gap: 1rem; }
.guide {
  grid-column: span 2; position: relative; display: flex; flex-direction: column; gap: .6rem;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.5rem; text-decoration: none; color: inherit; overflow: hidden;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.guide:hover { transform: translateY(-3px); box-shadow: var(--shadow); color: inherit; }
.guide.feature { grid-column: span 6; display: grid; grid-template-columns: 1.2fr 1fr; gap: 2rem; align-items: center; background: var(--night-2); color: #e7ede7; border-color: transparent; padding: clamp(1.5rem, 4vw, 2.6rem); }
.guide.feature:hover { color: #fff; }
.guide.feature h3 { color: #f6f2e6; font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem); }
.guide.feature p { color: #b9c8be; }
.guide.feature .kicker { color: var(--signal-2); }
.guide.feature .art { color: var(--signal-2); }
.guide:nth-child(2), .guide:nth-child(3) { grid-column: span 3; }
.guide .kicker { font: 600 .7rem/1.3 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--moss-2); }
.guide h3 { margin: 0; font-size: 1.3rem; }
.guide p { margin: 0; font-size: .96rem; color: var(--ink-2); }
.guide .meta { margin-top: auto; padding-top: .6rem; font: 500 .74rem/1.3 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); display: flex; gap: 1rem; }
.guide.feature .meta { color: #8fa699; }
.guide .art { width: 100%; max-width: 230px; justify-self: end; color: var(--moss); }
.guide .mini { width: 40px; height: 40px; color: var(--moss); }

/* trust band */
.trust { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.trust div { border-top: 2px solid var(--ink); padding-top: 1rem; }
.trust h3 { font-size: 1.1rem; margin: 0 0 .4rem; }
.trust p { font-size: .95rem; color: var(--ink-2); margin: 0; }

/* reveal on scroll */
@media (prefers-reduced-motion: no-preference) {
  .js .reveal { opacity: 0; transform: translateY(14px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
  .js .reveal.on { opacity: 1; transform: none; }
}

/* ------------------------------------------------------------------ article */
.page-head {
  position: relative; overflow: hidden; isolation: isolate;
  background: linear-gradient(180deg, var(--night) 0%, var(--night-2) 100%);
  color: #e6ece6; margin-top: -4.1rem; padding: calc(4.1rem + clamp(2.5rem, 6vw, 4.5rem)) 0 clamp(2.5rem, 5vw, 3.75rem);
}
.page-head .wrap { position: relative; z-index: 2; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 2rem; align-items: end; }
.page-head h1 { color: #f6f2e6; max-width: 50rem; font-size: clamp(2rem, 1.3rem + 2.6vw, 3.25rem); }
.page-head .lede { color: #bfcdc4; font-size: 1.12rem; max-width: 44rem; margin: 0; }
.page-head .topo-bg { position: absolute; inset: 0; z-index: 1; width: 100%; height: 100%; opacity: .9; }
.page-head .topo-bg path { fill: none; stroke: rgba(196,224,205,.09); stroke-width: 1; }
.page-head .topo-bg .route { stroke: rgba(240,166,58,.22); stroke-dasharray: 2 5; }
.page-head .topo-bg .pulse { stroke: var(--signal-2); stroke-width: 2; stroke-linecap: round; stroke-dasharray: 8 1400; }
@media (prefers-reduced-motion: no-preference) { .page-head .topo-bg .pulse { animation: travel-long 12s linear infinite; } }
@keyframes travel-long { from { stroke-dashoffset: 1410; } to { stroke-dashoffset: 0; } }
.page-head .head-art { width: clamp(120px, 16vw, 190px); color: var(--signal-2); opacity: .95; }
.crumbs { font: 500 .74rem/1.4 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: #8fa699; margin-bottom: 1.2rem; }
.crumbs a { color: #b8c9be; text-decoration: none; }
.crumbs a:hover { color: var(--signal-2); }
.crumbs span[aria-hidden] { margin: 0 .5rem; opacity: .6; }
.article-meta { display: flex; flex-wrap: wrap; gap: .5rem 1.5rem; margin-top: 1.6rem; font: 500 .76rem/1.4 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: #9fb4a7; }
.article-meta span { display: inline-flex; align-items: center; gap: .45rem; }
.article-meta svg { width: 14px; height: 14px; opacity: .8; }
.article-meta .ok { color: #bfe0bd; }

.article-layout { display: grid; grid-template-columns: 15.5rem minmax(0, var(--read)); gap: clamp(2rem, 5vw, 4.5rem); justify-content: center; padding: clamp(2.5rem, 5vw, 4rem) 0 5rem; }
.toc { position: sticky; top: 5.5rem; align-self: start; max-height: calc(100vh - 7rem); overflow: auto; font-size: .88rem; padding-right: .5rem; scrollbar-width: thin; }
.toc-title { font: 600 .7rem/1.3 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin: 0 0 .9rem; }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 1px solid var(--line-2); }
.toc a { display: block; padding: .38rem 0 .38rem 1rem; margin-left: -1px; border-left: 2px solid transparent; color: var(--ink-2); text-decoration: none; line-height: 1.35; transition: color .2s, border-color .2s; }
.toc a:hover { color: var(--ink); }
.toc a.active { color: var(--ink); border-left-color: var(--signal); font-weight: 600; }
.toc-mobile { display: none; }

.prose { min-width: 0; font-size: 1.075rem; }
.prose > *:first-child { margin-top: 0; }
.prose h2 { padding-top: .5rem; position: relative; }
.prose h2::before { content: ""; display: block; width: 2.2rem; height: 3px; border-radius: 3px; background: var(--signal); margin-bottom: 1rem; }
.prose h3 { font-family: var(--sans); font-weight: 650; font-size: 1.15rem; letter-spacing: 0; }
.prose ul, .prose ol { padding-left: 1.3rem; margin: 0 0 1.3rem; }
.prose li { margin-bottom: .45rem; }
.prose li::marker { color: var(--moss-2); }
.prose ol > li::marker { font: 600 .9em var(--mono); }
.prose strong { font-weight: 650; color: var(--ink); }
.prose a.ext::after { content: "↗"; font-size: .72em; margin-left: .15em; vertical-align: .25em; opacity: .55; text-decoration: none; display: inline-block; }
.prose blockquote { margin: 1.5rem 0; padding: 1rem 1.25rem; border-left: 3px solid var(--moss-2); background: var(--paper-2); border-radius: 0 10px 10px 0; }
.prose hr { border: 0; height: 1px; background: var(--line); margin: 2.5rem 0; }
.prose code { font: .9em var(--mono); background: var(--paper-2); padding: .1em .35em; border-radius: 4px; }
.intro { font-size: 1.2rem; line-height: 1.6; color: var(--ink); }

.takeaways { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.5rem 1.6rem .6rem; margin: 2rem 0 2.5rem; box-shadow: var(--shadow); position: relative; overflow: hidden; }
.takeaways::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: linear-gradient(var(--signal), var(--moss-2)); }
.takeaways h2 { margin: 0 0 1rem; font: 600 .74rem/1.3 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--moss); padding: 0; }
.takeaways h2::before { display: none; }
.takeaways ul { list-style: none; padding: 0; }
.takeaways li { position: relative; padding-left: 1.6rem; margin-bottom: .8rem; font-size: 1rem; }
.takeaways li::before { content: ""; position: absolute; left: 0; top: .55em; width: 9px; height: 9px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 0 4px rgba(240,166,58,.18); }

.table-wrap { margin: 1.5rem 0 1.75rem; overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; background: var(--card); -webkit-overflow-scrolling: touch; scrollbar-width: thin; position: relative; }
.table-wrap:focus-visible { outline-offset: 2px; }
.prose table { border-collapse: separate; border-spacing: 0; width: 100%; font-size: .9rem; line-height: 1.45; }
.prose table.wide { min-width: 720px; }
.prose th, .prose td { text-align: left; vertical-align: top; padding: .75rem .9rem; border-bottom: 1px solid var(--line); }
.prose thead th { font: 600 .7rem/1.35 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); background: var(--paper-2); position: sticky; top: 0; }
.prose tbody th { font-weight: 650; color: var(--ink); background: var(--card); }
.prose tbody tr:last-child > * { border-bottom: 0; }
.prose tbody tr:hover > * { background: #f6f1e4; }
@media (max-width: 720px) {
  .prose table.wide tbody th { position: sticky; left: 0; z-index: 1; box-shadow: 1px 0 0 var(--line); min-width: 8.5rem; }
  .prose table.wide thead th:first-child { position: sticky; left: 0; z-index: 2; }
}
.scroll-hint { display: none; font: 500 .7rem/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin: -1rem 0 1.5rem; }
@media (max-width: 760px) { .scroll-hint { display: block; } }

.faq { margin: 1rem 0 2rem; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { list-style: none; cursor: pointer; display: flex; align-items: flex-start; justify-content: space-between; gap: 1rem; padding: 1.1rem 0; font: 650 1.05rem/1.4 var(--sans); color: var(--ink); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; flex: none; width: 1.6rem; height: 1.6rem; margin-top: -.1rem; border-radius: 50%; border: 1px solid var(--line-2); background: var(--card) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M8 3.5v9M3.5 8h9' stroke='%232c5a44' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E") center / 12px no-repeat; transition: transform .3s var(--ease), background-color .2s; }
.faq details[open] summary::after { transform: rotate(45deg); background-color: #fbe7c4; }
.faq summary:hover { color: var(--moss); }
.faq .answer { padding: 0 2.6rem 1.1rem 0; color: var(--ink-2); }
.faq .answer p:last-child { margin-bottom: 0; }

.sources { font-size: .86rem; color: var(--ink-2); }
.sources ul { padding-left: 1.1rem; }
.sources li { margin-bottom: .45rem; overflow-wrap: anywhere; }
.sources a { color: var(--ink-2); }

.disclaimer { margin: 3rem 0 0; padding: 1.25rem 1.4rem; border-radius: var(--radius); background: var(--paper-2); font-size: .92rem; color: var(--ink-2); display: flex; gap: 1rem; align-items: flex-start; }
.disclaimer svg { flex: none; width: 22px; height: 22px; color: var(--moss); margin-top: .1rem; }
.disclaimer p { margin: 0; }

.related { border-top: 1px solid var(--line); padding: 3.5rem 0 4.5rem; background: var(--paper-2); }
.related h2 { margin: 0 0 1.5rem; font-size: 1.5rem; }
.related-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.related-grid .guide { grid-column: auto; padding: 1.25rem; }
.related-grid .guide h3 { font-size: 1.08rem; }

.page-body { padding: clamp(2.5rem, 5vw, 4rem) 0 5rem; }
.page-body .prose { max-width: var(--read); margin: 0 auto; }

/* ------------------------------------------------------------------ 404 */
.lost { min-height: 70vh; display: grid; place-items: center; text-align: center; padding: 4rem 0; }
.lost svg { width: min(420px, 90%); color: var(--moss); margin: 0 auto 1.5rem; display: block; }
.lost .cut { stroke: var(--signal); }
@media (prefers-reduced-motion: no-preference) { .lost .spark { animation: sig 1.4s ease-in-out infinite; } }

/* ------------------------------------------------------------------ footer */
.site-footer { background: var(--night); color: #b3c3b9; padding: 4rem 0 2.5rem; font-size: .93rem; position: relative; overflow: hidden; }
.site-footer::before { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 1px; background: linear-gradient(90deg, transparent, rgba(240,166,58,.6), transparent); }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 2.5rem; }
.site-footer h2 { font: 600 .72rem/1.3 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: #7f978a; margin: 0 0 1rem; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .5rem; }
.site-footer a { color: #dfe7e1; text-decoration: none; }
.site-footer a:hover { color: var(--signal-2); }
.site-footer .brand { color: #f3efe3; margin-bottom: 1rem; }
.site-footer .brand-name small { color: #7f978a; }
.site-footer p { max-width: 30rem; }
.footer-base { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,.08); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; font: 500 .72rem/1.5 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: #6f877a; }

/* ------------------------------------------------------------------ responsive */
@media (max-width: 1100px) {
  .article-layout { grid-template-columns: minmax(0, var(--read)); }
  .toc { display: none; }
  .toc-mobile { display: block; margin: 0 0 2rem; border: 1px solid var(--line); border-radius: 12px; background: var(--card); }
  .toc-mobile summary { cursor: pointer; padding: .9rem 1.1rem; font: 600 .74rem/1.3 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--moss); }
  .toc-mobile ol { margin: 0; padding: 0 1.1rem 1rem 2.4rem; font-size: .95rem; }
  .toc-mobile li { margin: .35rem 0; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 960px) {
  .stats { grid-template-columns: 1fr; }
  .options { grid-template-columns: repeat(2, 1fr); }
  .timeline { grid-template-columns: 1fr; gap: 0; }
  .timeline::before { left: 7px; right: auto; top: 0; bottom: 0; width: 2px; height: auto; background: repeating-linear-gradient(180deg, var(--line-2) 0 6px, transparent 6px 11px); }
  .timeline::after { display: none; }
  .timeline li { padding: 0 0 1.6rem 2.4rem; }
  .timeline li::before { top: 2px; }
  .guide.feature { grid-template-columns: 1fr; }
  .guide.feature .art { display: none; }
  .guides .guide, .guide:nth-child(2), .guide:nth-child(3) { grid-column: span 3; }
  .guides .guide.feature { grid-column: span 6; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid > :first-child { grid-column: 1 / -1; }
  .trust { grid-template-columns: 1fr; gap: 1.25rem; }
  .page-head .head-art { display: none; }
  .page-head .wrap { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  body { font-size: 1.02rem; }
  .options, .checkers { grid-template-columns: 1fr; }
  .guides { grid-template-columns: 1fr; }
  .guides .guide, .guides .guide.feature, .guide:nth-child(2), .guide:nth-child(3) { grid-column: auto; }
  .related-grid { grid-template-columns: 1fr; }
  .homes { gap: 3px; }
  .hero-cta .btn { width: 100%; justify-content: center; }
  .footer-grid { grid-template-columns: 1fr; }
  .brand-name small { display: none; }
  .faq .answer { padding-right: 0; }
}

@media print {
  .site-header, .site-footer, .toc, .toc-mobile, .related, .landscape, .topo-bg, .head-art, .progress { display: none !important; }
  .page-head, .hero { background: none; color: #000; margin: 0; padding: 1rem 0; }
  .page-head h1, .hero h1 { color: #000; }
  .article-layout { display: block; padding: 0; }
  .prose a.ext::after { content: " (" attr(href) ")"; font-size: .8em; }
  .faq details > * { display: block; }
}