/* Klarbild demo site — the product's own tokens, one accent, warm paper. */

:root {
  --measure: 62ch;
  --gutter: clamp(20px, 5vw, 64px);
  --wide: 1240px;
  --bleed: oklch(88% 0.012 150);
  --cellfill: oklch(93.5% 0.012 150);
  --cellink: oklch(58% 0.035 158);
}

body {
  background:
    radial-gradient(70rem 40rem at 82% -10%, oklch(45% 0.23 267 / 0.05), transparent 60%),
    var(--paper);
  background-attachment: fixed;
}

/* Paper grain. Fixed and pointer-transparent so it never repaints on scroll. */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.32;
  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='0.8' numOctaves='3'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.28'/%3E%3C/svg%3E");
}

.shell { width: min(100% - var(--gutter) * 2, var(--wide)); margin-inline: auto; }

/* The top bar is sticky, so anything jumped to needs room above it. */
:target, section[id], #try { scroll-margin-top: 78px; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
.prose { max-width: var(--measure); }

h1, h2, h3 { font-family: var(--font-display); letter-spacing: -0.03em; line-height: 1.02; margin: 0; }
h1 { font-size: clamp(2.6rem, 7vw, 5.1rem); font-weight: 700; }
h2 { font-size: clamp(1.7rem, 3.6vw, 2.7rem); font-weight: 700; }
h3 { font-size: 1.05rem; font-weight: 700; letter-spacing: -0.01em; }
p  { margin: 0 0 1em; }
.lead { font-size: clamp(1.05rem, 1.8vw, 1.28rem); color: var(--ink-soft); line-height: 1.6; }
.kicker { font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--ink-soft); display: block; margin-bottom: 14px; }
.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

/* ------------------------------------------------------------------- header */

.top {
  position: sticky; top: 0; z-index: 30;
  backdrop-filter: saturate(1.3) blur(10px);
  background: color-mix(in oklab, var(--paper) 82%, transparent);
  border-bottom: 1px solid var(--line);
}
.top-in { display: flex; align-items: center; gap: 18px; padding: 13px 0;
  padding-top: calc(13px + env(safe-area-inset-top, 0px)); }
.brand { display: inline-flex; align-items: center; gap: 9px; font-family: var(--font-display);
  font-weight: 700; font-size: 1.14rem; color: var(--ink); text-decoration: none; letter-spacing: -0.02em; }
.top nav { margin-left: auto; display: flex; align-items: center; gap: 6px; }
.top nav a { color: var(--ink-soft); text-decoration: none; font-size: 0.88rem;
  padding: 7px 11px; border-radius: 999px; }
.top nav a:hover { color: var(--ink); background: var(--card); }
.top nav a.cta { color: #fff; background: var(--accent); font-weight: 600; }
.top nav a.cta:hover { background: var(--accent-2); color: #fff; }
@media (max-width: 720px) { .top nav a.hide-s { display: none; } }

/* --------------------------------------------------------------------- hero */

.hero { padding: clamp(48px, 9vw, 108px) 0 clamp(36px, 6vw, 64px); position: relative; z-index: 2; }
.hero-grid { display: grid; gap: clamp(28px, 5vw, 56px); align-items: end;
  grid-template-columns: minmax(0, 1fr); }
@media (min-width: 900px) { .hero-grid { grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); } }
.hero h1 span { color: var(--accent); }
.hero .lead { margin-top: 22px; max-width: 46ch; }
.hero-side { border-left: 1px solid var(--line); padding-left: clamp(18px, 3vw, 30px); }
@media (max-width: 899px) { .hero-side { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); padding-top: 22px; } }
.hero-side dl { display: grid; grid-template-columns: auto 1fr; gap: 9px 16px; margin: 0; }
.hero-side dt { font-family: var(--font-mono); font-size: 1.05rem; font-weight: 700;
  font-variant-numeric: tabular-nums; color: var(--ink); }
.hero-side dd { margin: 0; font-size: 0.86rem; color: var(--ink-soft); align-self: center; }

.btnrow { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.btn { display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); text-decoration: none; font-weight: 600;
  font-size: 0.93rem; padding: 12px 18px; border-radius: var(--radius); cursor: pointer;
  font-family: inherit; transition: transform .12s cubic-bezier(.16,1,.3,1), background .16s, border-color .16s; }
.btn:hover { border-color: var(--ink-soft); }
.btn:active { transform: translateY(1px); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff;
  box-shadow: inset 0 1px 0 rgb(255 255 255 / 0.16); }
.btn.primary:hover { background: var(--accent-2); border-color: var(--accent-2); }
.btn[disabled] { opacity: .55; cursor: progress; }

/* --------------------------------------------------------------- playground */

.pg { position: relative; z-index: 2; padding-bottom: clamp(40px, 7vw, 88px); }
.pg-shell { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: 0 18px 50px -34px oklch(21% 0.01 95 / 0.5); overflow: hidden; }
.pg-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px 18px;
  padding: 15px 18px; border-bottom: 1px solid var(--line); }
.pg-head h2 { font-size: 1.05rem; }
.pg-head .fine { font-size: 0.82rem; color: var(--ink-soft); margin-left: auto; }
.pg-body { display: grid; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 880px) { .pg-body { grid-template-columns: minmax(300px, 380px) minmax(0, 1fr); } }
.pg-controls { padding: 20px 18px; display: grid; gap: 17px; align-content: start; }
@media (min-width: 880px) { .pg-controls { border-right: 1px solid var(--line); } }
.field { display: grid; gap: 6px; }
.field > label { font-family: var(--font-mono); font-size: 10px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--ink-soft); }
select, input[type=number] { font-family: inherit; font-size: 0.94rem; color: var(--ink);
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 9px 10px; width: 100%; }
input[type=range] { width: 100%; accent-color: var(--accent); }
.seg { display: flex; gap: 0; border: 1px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; }
.seg button { flex: 1; font-family: inherit; font-size: 0.85rem; padding: 9px 6px; border: 0;
  background: var(--paper); color: var(--ink-soft); cursor: pointer; border-right: 1px solid var(--line); }
.seg button:last-child { border-right: 0; }
.seg button[aria-pressed=true] { background: var(--accent-bg); color: var(--accent); font-weight: 600; }
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.slider-head { display: flex; justify-content: space-between; align-items: baseline; }
.slider-head span { font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink); }
.toggle { display: flex; align-items: center; gap: 9px; font-size: 0.88rem; color: var(--ink-soft); }
.toggle button { width: 38px; height: 22px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--paper); position: relative; cursor: pointer; padding: 0; }
.toggle button::after { content: ''; position: absolute; top: 2px; left: 2px; width: 16px; height: 16px;
  border-radius: 50%; background: var(--mark); transition: transform .16s cubic-bezier(.16,1,.3,1), background .16s; }
.toggle button[aria-pressed=true] { border-color: var(--accent); background: var(--accent-bg); }
.toggle button[aria-pressed=true]::after { transform: translateX(16px); background: var(--accent); }

.pg-stage { padding: 22px 18px 26px; display: grid; gap: 16px; align-content: start;
  background: repeating-linear-gradient(45deg, transparent 0 11px, oklch(21% 0.01 95 / 0.015) 11px 22px); }
.stage-sheet { display: grid; place-items: center; }
#sheet { width: auto; max-width: 100%; max-height: min(58vh, 520px);
  filter: drop-shadow(0 10px 26px oklch(21% 0.01 95 / 0.16)); background: #fff; }
#sheet .cell { animation: pop .34s cubic-bezier(.16,1,.3,1) backwards;
  animation-delay: calc(var(--i) * 22ms); }
@keyframes pop { from { opacity: 0; transform: scale(.965); } }
@media (prefers-reduced-motion: reduce) { #sheet .cell { animation: none; } }

.readout { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; }
@media (min-width: 560px) { .readout { grid-template-columns: repeat(5, minmax(0, 1fr)); } }
.readout div { background: var(--card); padding: 10px 12px; }
.readout dt { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: .15em;
  text-transform: uppercase; color: var(--ink-soft); margin-bottom: 3px; }
.readout dd { margin: 0; font-family: var(--font-mono); font-size: 0.95rem; font-weight: 700;
  font-variant-numeric: tabular-nums; }
.note { font-size: 0.88rem; padding: 10px 12px; border-left: 2px solid var(--mark);
  background: var(--paper); color: var(--ink-soft); }
.note[data-tone=ok] { border-left-color: var(--ok); }
.note[data-tone=warn] { border-left-color: var(--warn); color: var(--ink); }
.pg-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 12px;
  padding: 14px 18px; border-top: 1px solid var(--line); }
.pg-foot p { margin: 0; font-size: 0.82rem; color: var(--ink-soft); max-width: 52ch; }

/* ----------------------------------------------------------------- sections */

section { position: relative; z-index: 2; padding: clamp(46px, 8vw, 96px) 0; }
section + section { border-top: 1px solid var(--line); }

.zig { display: grid; gap: clamp(24px, 4vw, 52px); align-items: center;
  grid-template-columns: minmax(0, 1fr); }
@media (min-width: 880px) { .zig { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
@media (min-width: 880px) { .zig.flip > :first-child { order: 2; } }
.zig figure { margin: 0; border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; background: var(--card); box-shadow: 0 16px 44px -34px oklch(21% 0.01 95 / 0.55); }
.zig figure img { display: block; width: 100%; height: auto; }
.zig figcaption { font-size: 0.8rem; color: var(--ink-soft); padding: 9px 12px; border-top: 1px solid var(--line); }

.facts { display: grid; gap: 0; margin-top: 30px; border-top: 1px solid var(--line); }
.facts > div { display: grid; gap: 4px; padding: 16px 0; border-bottom: 1px solid var(--line); }
@media (min-width: 680px) { .facts > div { grid-template-columns: 13rem minmax(0, 1fr); gap: 20px; align-items: baseline; } }
.facts h3 { color: var(--ink); }
.facts p { margin: 0; color: var(--ink-soft); font-size: 0.94rem; }

/* Modules: a list that reads as a switchboard, not three equal cards. */
.mods { display: grid; gap: 0; border-top: 1px solid var(--line); margin-top: 32px; }
.mod { display: grid; gap: 4px 18px; padding: 15px 0; border-bottom: 1px solid var(--line);
  grid-template-columns: minmax(0, 1fr); }
@media (min-width: 760px) { .mod { grid-template-columns: 9.5rem minmax(0, 1fr) 15rem; align-items: baseline; } }
.mod code { font-family: var(--font-mono); font-size: 0.86rem; color: var(--accent); }
.mod.core code { color: var(--ink); }
.mod p { margin: 0; font-size: 0.94rem; }
.mod .need { font-size: 0.83rem; color: var(--ink-soft); }
.mod.core { background: linear-gradient(90deg, var(--accent-bg), transparent 60%); }

pre { background: var(--ink); color: oklch(94% 0.01 95); font-family: var(--font-mono);
  font-size: 0.83rem; line-height: 1.7; padding: 16px 18px; border-radius: var(--radius);
  overflow-x: auto; margin: 0; }
pre .c { color: oklch(66% 0.02 95); }
code { font-family: var(--font-mono); font-size: 0.9em; }

.split-code { display: grid; gap: clamp(22px, 4vw, 44px); grid-template-columns: minmax(0, 1fr); align-items: start; }
@media (min-width: 880px) { .split-code { grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr); } }

footer { position: relative; z-index: 2; border-top: 1px solid var(--line);
  padding: 40px 0 calc(48px + env(safe-area-inset-bottom, 0px)); }
.foot-in { display: flex; flex-wrap: wrap; gap: 14px 28px; align-items: baseline; }
footer a { color: var(--ink-soft); text-decoration: none; font-size: 0.88rem; }
footer a:hover { color: var(--accent); }
footer .fine { font-size: 0.8rem; color: var(--ink-soft); margin-left: auto; }
@media (max-width: 620px) { footer .fine { margin-left: 0; width: 100%; } }