/* ==========================================================================
   JF Filtr V2 — layout and components.
   No raw colour values here; everything resolves through tokens.css.
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-text);
  font-size: var(--fs-body);
  line-height: 1.47;
  letter-spacing: var(--tr-flat);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.07;
  color: var(--text);
  text-wrap: balance;
}

p { text-wrap: pretty; }
a { color: inherit; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
ul, ol { list-style: none; }

.num { font-variant-numeric: tabular-nums; }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}
::selection { background: var(--accent); color: var(--accent-on); }

/* ---------- Shell -------------------------------------------------------- */

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--sp-6); }
.wrap--narrow { max-width: var(--wrap-narrow); }
@media (max-width: 600px) { .wrap { padding: 0 var(--sp-5); } }

section {
  position: relative;
  z-index: var(--z-base);
  padding: var(--sp-11) 0;
  background: var(--bg);
  color: var(--text);
}
section.sunken { background: var(--bg-sunken); }
@media (max-width: 740px) { section { padding: var(--sp-9) 0; } }

/* Section heads are centred by default — the layout the imitated look uses
   for almost every chapter opener. .head--start opts back into left-aligned
   for sections that pair prose with a figure. */
.head {
  max-width: 40rem;
  margin: 0 auto var(--sp-9);
  text-align: center;
}
.head--start { margin-inline: 0; text-align: left; }
.head--wide { max-width: 52rem; }

.eyebrow {
  display: block;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: var(--tr-eyebrow);
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--sp-4);
}

.head h2 { font-size: var(--fs-xxl); letter-spacing: var(--tr-xxl); }
.head .lede {
  margin-top: var(--sp-5);
  font-size: var(--fs-md);
  line-height: 1.42;
  color: var(--text-2);
}
.head--start .lede { max-width: var(--measure); }

/* ---------- Skip link ----------------------------------------------------- */

.skip-link {
  position: fixed;
  left: 50%;
  top: -6rem;
  transform: translateX(-50%);
  z-index: var(--z-top);
  background: var(--text);
  color: var(--bg);
  padding: var(--sp-3) var(--sp-6);
  border-radius: var(--r-pill);
  text-decoration: none;
  font-size: var(--fs-sm);
  font-weight: 500;
  transition: top var(--dur-base) var(--ease);
}
.skip-link:focus-visible { top: var(--sp-4); }

/* ---------- Nav ------------------------------------------------------------
   Thin, translucent, and quiet: it is a wayfinding strip, not a banner. */

.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-nav);
  height: 3rem;
  background: var(--nav-bg);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur-base) var(--ease);
}
.nav.is-scrolled { border-bottom-color: var(--nav-line); }

.nav-inner {
  max-width: var(--wrap);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--sp-6);
  display: flex;
  align-items: center;
  gap: var(--sp-6);
}
@media (max-width: 600px) { .nav-inner { padding: 0 var(--sp-5); } }

.brand {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: var(--tr-lg);
  text-decoration: none;
  color: var(--text);
  flex: none;
}
.brand svg { width: 18px; height: 18px; }

.nav-links {
  display: flex;
  gap: var(--sp-6);
  margin: 0 auto;
  font-size: var(--fs-xs);
}
.nav-links a {
  color: var(--text-2);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
  white-space: nowrap;
}
.nav-links a:hover { color: var(--text); }
.nav-links a[aria-current='true'] { color: var(--text); font-weight: 500; }

.nav-cta {
  flex: none;
  font-size: var(--fs-xs);
  font-weight: 500;
  padding: 0.32rem 0.85rem;
  border-radius: var(--r-pill);
  background: var(--btn-bg);
  color: var(--btn-fg);
  text-decoration: none;
  transition: background var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.nav-cta:hover { background: var(--btn-bg-hover); }
.nav-cta:active { transform: scale(0.97); }

.nav-toggle {
  display: none;
  flex: none;
  width: 2rem; height: 2rem;
  background: none;
  border: none;
  cursor: pointer;
  position: relative;
}
.nav-toggle span {
  position: absolute;
  left: 50%;
  width: 17px;
  height: 1.5px;
  margin-left: -8.5px;
  background: var(--text);
  transition: transform var(--dur-base) var(--ease), opacity var(--dur-fast) linear;
}
.nav-toggle span:nth-child(1) { top: 13px; }
.nav-toggle span:nth-child(2) { top: 19px; }
.nav-toggle[aria-expanded='true'] span:nth-child(1) { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded='true'] span:nth-child(2) { transform: translateY(-3px) rotate(-45deg); }

@media (max-width: 900px) {
  .nav-toggle { display: block; order: 3; }
  .nav-cta { order: 2; margin-left: auto; }
  .nav-links {
    order: 4;
    position: fixed;
    inset: 3rem 0 auto 0;
    display: grid;
    gap: 0;
    margin: 0;
    padding: var(--sp-4) var(--sp-5) var(--sp-6);
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    font-size: var(--fs-lg);
    transform: translateY(-120%);
    transition: transform var(--dur-base) var(--ease);
  }
  .nav-links.is-open { transform: translateY(0); }
  .nav-links a {
    padding: var(--sp-4) 0;
    border-bottom: 1px solid var(--line-soft);
    color: var(--text);
  }
  .nav-links a:last-child { border-bottom: none; }
}

/* ---------- Buttons -------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 0.75rem 1.5rem;
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.2;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--dur-fast) var(--ease),
              color var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease),
              transform var(--dur-fast) var(--ease);
}
.btn--primary { background: var(--btn-bg); color: var(--btn-fg); }
.btn--primary:hover { background: var(--btn-bg-hover); }
.btn--primary:active { transform: scale(0.975); }
.btn--primary[disabled], .btn--primary[aria-disabled='true'] {
  background: var(--btn-disabled-bg);
  color: var(--btn-disabled-fg);
  cursor: not-allowed;
  transform: none;
}
.btn--ghost {
  background: transparent;
  color: var(--btn-ghost-fg);
  border-color: var(--btn-ghost-line);
}
.btn--ghost:hover { border-color: var(--accent); }
.btn--ghost:active { transform: scale(0.975); }

/* A text link with a chevron — the quiet secondary action. */
.link {
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  color: var(--accent);
  font-size: var(--fs-body);
  text-decoration: none;
}
.link::after {
  content: '›';
  font-size: 1.25em;
  line-height: 1;
  transform: translateY(-0.06em);
  transition: transform var(--dur-base) var(--ease-out);
}
.link:hover { text-decoration: underline; text-underline-offset: 3px; }
.link:hover::after { transform: translate(3px, -0.06em); }

.cta-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-6);
  flex-wrap: wrap;
}
.head--start .cta-row, .cta-row--start { justify-content: flex-start; }

/* ---------- Hero ------------------------------------------------------------
   Centred type, then the product beneath it. The page opens on the object
   itself rather than on a photograph of a factory. */

.hero {
  padding: 8.5rem 0 0;
  text-align: center;
  background:
    radial-gradient(120% 70% at 50% 0%, var(--accent-wash), transparent 62%),
    var(--bg);
  overflow: hidden;
}

.hero-eyebrow {
  font-size: var(--fs-md);
  font-weight: 500;
  letter-spacing: var(--tr-lg);
  color: var(--accent);
  margin-bottom: var(--sp-3);
}

.hero h1 {
  font-size: var(--fs-mega);
  letter-spacing: var(--tr-mega);
  max-width: 16ch;
  margin: 0 auto;
}
.hero h1 .line { display: block; overflow: hidden; padding-bottom: 0.04em; }
.hero h1 .line > span { display: block; will-change: transform; }

.hero-sub {
  margin: var(--sp-6) auto 0;
  max-width: 44ch;
  font-size: var(--fs-md);
  line-height: 1.42;
  color: var(--text-2);
}

.hero .cta-row { margin-top: var(--sp-7); }

.hero-figure {
  margin-top: var(--sp-8);
  position: relative;
}
.hero-figure svg {
  width: min(100%, 62rem);
  height: auto;
  margin: 0 auto;
  filter: drop-shadow(var(--shadow-drop));
}
.hero-figure .scene-canvas { height: clamp(20rem, 46vw, 34rem); }

/* The three headline numbers, sitting under the product like a spec strip. */
.hero-readout {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-6);
  max-width: 46rem;
  margin: var(--sp-8) auto 0;
  padding: var(--sp-7) 0 0;
  border-top: 1px solid var(--line-soft);
}
@media (max-width: 640px) {
  .hero-readout { grid-template-columns: 1fr; gap: var(--sp-5); text-align: center; }
}
.hero-readout dt {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 600;
  letter-spacing: var(--tr-lg);
  font-variant-numeric: tabular-nums;
  color: var(--text);
}
.hero-readout dd {
  margin-top: var(--sp-1);
  font-size: var(--fs-xs);
  line-height: 1.4;
  color: var(--text-3);
}

/* ---------- Stats ---------------------------------------------------------- */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-6);
  text-align: center;
}
@media (max-width: 900px) { .stat-grid { grid-template-columns: repeat(2, 1fr); gap: var(--sp-8) var(--sp-5); } }
@media (max-width: 480px) { .stat-grid { grid-template-columns: 1fr; } }

.stat b {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 4.4vw, 3.4rem);
  font-weight: 600;
  letter-spacing: var(--tr-xxl);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--accent);
}
.stat span {
  display: block;
  margin: var(--sp-3) auto 0;
  max-width: 22ch;
  font-size: var(--fs-sm);
  line-height: 1.4;
  color: var(--text-2);
}

/* ---------- Standards strip ------------------------------------------------ */

.norms {
  padding: var(--sp-7) 0;
  background: var(--bg);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}
.norms .wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-5) var(--sp-8);
  flex-wrap: wrap;
  text-align: center;
}
.norms .label {
  font-size: var(--fs-xs);
  letter-spacing: var(--tr-wide);
  text-transform: uppercase;
  color: var(--text-3);
}
.norms ul { display: flex; gap: var(--sp-5) var(--sp-7); flex-wrap: wrap; justify-content: center; }
.norms li { font-size: var(--fs-sm); color: var(--text-2); }

/* ---------- Prose ---------------------------------------------------------- */

.prose {
  max-width: var(--measure);
  font-size: var(--fs-md);
  line-height: 1.5;
  color: var(--text-2);
}
.prose p + p { margin-top: var(--sp-5); }

.pull {
  max-width: 26ch;
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 600;
  line-height: 1.16;
  letter-spacing: var(--tr-xl);
  color: var(--text);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--sp-8) var(--sp-9);
  align-items: start;
}
@media (max-width: 860px) { .split { grid-template-columns: 1fr; gap: var(--sp-7); } }

/* ---------- Stage: the pinned filtration showcase --------------------------
   A dark, full-bleed chapter. The diagram is pinned while the copy beside it
   steps through the five capture stages as the visitor scrolls. */

.showcase { padding: 0; background: var(--bg); }

.showcase-intro {
  padding: var(--sp-11) 0 var(--sp-9);
  text-align: center;
}
.showcase-intro h2 { font-size: var(--fs-xxl); letter-spacing: var(--tr-xxl); }
.showcase-intro .lede {
  margin: var(--sp-5) auto 0;
  max-width: 46ch;
  font-size: var(--fs-md);
  color: var(--text-2);
}

.showcase-stage {
  position: relative;
  min-height: 100svh;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  align-items: center;
  gap: var(--sp-8);
  max-width: var(--wrap);
  margin: 0 auto;
  padding: var(--sp-8) var(--sp-6);
}
@media (max-width: 900px) {
  .showcase-stage {
    grid-template-columns: 1fr;
    align-content: center;
    gap: var(--sp-6);
    padding: var(--sp-7) var(--sp-5);
  }
}

.showcase-figure { position: relative; }
.showcase-figure svg { width: 100%; height: auto; }
.showcase-figure .scene-canvas { height: min(64svh, 34rem); }

/* ---------- 3D scenes -------------------------------------------------------
   Each figure ships an SVG and a canvas stacked in the same box. The canvas
   stays hidden until three-scenes.js has a live WebGL context, so a machine
   without one — or with the vendor file missing — keeps the drawing rather
   than a blank rectangle. */

.scene-canvas {
  display: none;
  width: 100%;
  max-width: 62rem;
  margin: 0 auto;
  touch-action: pan-y; /* the canvas must never swallow a page scroll */
}
.is-3d .scene-canvas { display: block; }
.is-3d svg { display: none; }

.showcase-copy { max-width: 26rem; }
.showcase-step {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tr-wide);
  color: var(--text-3);
}
.showcase-class {
  display: block;
  margin-top: var(--sp-2);
  font-family: var(--font-display);
  font-size: clamp(3rem, 7vw, 4.6rem);
  font-weight: 600;
  letter-spacing: var(--tr-mega);
  line-height: 1;
  color: var(--accent);
}
.showcase-caption {
  margin-top: var(--sp-4);
  min-height: 3.4em;
  font-size: var(--fs-md);
  line-height: 1.42;
  color: var(--text-2);
}

/* The live capture readout — the reduction in one number. */
.showcase-eff {
  display: flex;
  align-items: baseline;
  gap: var(--sp-3);
  margin-top: var(--sp-6);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--line);
}
.showcase-eff-label {
  font-size: var(--fs-xs);
  letter-spacing: var(--tr-wide);
  text-transform: uppercase;
  color: var(--text-3);
}
.showcase-eff b {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 600;
  letter-spacing: var(--tr-xl);
  line-height: 1;
  color: var(--text);
}

/* Five ticks that fill as the scene advances. */
.showcase-ticks {
  display: flex;
  gap: var(--sp-2);
  margin-top: var(--sp-6);
}
.showcase-ticks i {
  flex: 1;
  height: 2px;
  border-radius: 2px;
  background: var(--line);
  overflow: hidden;
  position: relative;
}
.showcase-ticks i::after {
  content: '';
  position: absolute;
  inset: 0 100% 0 0;
  background: var(--accent);
  transition: right var(--dur-base) var(--ease);
}
.showcase-ticks i.is-done::after { right: 0; }

/* ---------- Product feature ------------------------------------------------- */

.feature { display: grid; gap: var(--sp-8); align-items: center; }
.feature--split {
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--sp-9);
}
@media (max-width: 860px) {
  .feature--split { grid-template-columns: 1fr; gap: var(--sp-7); }
  .feature--split .feature-figure { order: -1; max-width: 22rem; margin: 0 auto; }
}
.feature-figure svg { width: 100%; height: auto; }

/* ---------- Datasheet -------------------------------------------------------- */

.sheet-wrap { max-width: 56rem; margin: 0 auto; }

.sheet {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--fs-body);
  font-variant-numeric: tabular-nums;
}
.sheet caption {
  caption-side: top;
  text-align: left;
  font-size: var(--fs-xs);
  letter-spacing: var(--tr-wide);
  text-transform: uppercase;
  color: var(--text-3);
  padding-bottom: var(--sp-4);
}
.sheet th, .sheet td {
  text-align: left;
  padding: var(--sp-5) var(--sp-4);
  border-bottom: 1px solid var(--sheet-line);
  vertical-align: baseline;
}
.sheet thead th {
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: var(--tr-wide);
  text-transform: uppercase;
  color: var(--text-3);
  padding-block: var(--sp-3);
}
.sheet tbody tr { transition: background var(--dur-fast) linear; }
.sheet tbody tr:hover { background: var(--sheet-hover); }
.sheet tbody th {
  font-weight: 400;
  color: var(--text-2);
  width: 30%;
}
.sheet td.value {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: var(--tr-lg);
  color: var(--text);
  width: 28%;
}
.sheet td.unit { color: var(--accent); font-size: var(--fs-sm); width: 14%; }
.sheet td.note { color: var(--text-3); font-size: var(--fs-sm); }

/* Below the breakpoint each row becomes a card: nothing is dropped and the
   page never scrolls sideways. */
@media (max-width: 740px) {
  .sheet, .sheet tbody { display: block; }
  .sheet thead { display: none; }
  .sheet tbody { display: grid; gap: var(--sp-3); }
  .sheet tbody tr {
    display: block;
    padding: var(--sp-5);
    background: var(--bg-card);
    border: 1px solid var(--card-line);
    border-radius: var(--r-md);
  }
  .sheet tbody tr:hover { background: var(--bg-card); }
  .sheet th, .sheet td { display: inline; border: none; padding: 0; width: auto; }
  .sheet tbody th {
    display: block;
    font-size: var(--fs-xs);
    letter-spacing: var(--tr-wide);
    text-transform: uppercase;
    color: var(--text-3);
    margin-bottom: var(--sp-2);
  }
  .sheet td.value { font-size: var(--fs-lg); }
  .sheet td.unit { margin-left: var(--sp-2); }
  .sheet td.note { display: block; margin-top: var(--sp-2); }
}

/* ---------- Savings calculator ------------------------------------------------ */

.calc {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
  gap: var(--sp-6);
  align-items: stretch;
  max-width: 62rem;
  margin: 0 auto;
}
@media (max-width: 860px) { .calc { grid-template-columns: 1fr; } }

.calc-inputs {
  display: grid;
  gap: var(--sp-6);
  padding: var(--sp-8);
  background: var(--bg-card);
  border: 1px solid var(--card-line);
  border-radius: var(--r-xl);
}
@media (max-width: 560px) { .calc-inputs { padding: var(--sp-5); } }

.calc-row { display: grid; gap: var(--sp-3); }
.calc-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: var(--sp-4);
  font-size: var(--fs-sm);
}
.calc-head label { color: var(--text-2); }
.calc-head output {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
}

/* A hand-built track so the slider matches the rest of the page instead of
   whatever the OS ships. */
.calc-row input[type='range'] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: 2px;
  background: var(--line);
  cursor: pointer;
}
.calc-row input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur-fast) var(--ease);
}
.calc-row input[type='range']::-webkit-slider-thumb:active { transform: scale(1.12); }
.calc-row input[type='range']::-moz-range-thumb {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-sm);
}
.calc-row input[type='number'] {
  width: 100%;
  padding: 0.7rem 0.9rem;
  background: var(--field-bg);
  border: 1px solid var(--field-line);
  border-radius: var(--r-sm);
  font-size: var(--fs-body);
  font-variant-numeric: tabular-nums;
}
.calc-row input[type='number']:focus-visible {
  outline: none;
  border-color: var(--field-line-focus);
  box-shadow: 0 0 0 4px var(--accent-wash);
}

.calc-result {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--sp-3);
  padding: var(--sp-8);
  border-radius: var(--r-xl);
  background:
    radial-gradient(110% 80% at 20% 0%, var(--accent-wash), transparent 70%),
    var(--bg-card);
  border: 1px solid var(--card-line);
  box-shadow: var(--shadow-md);
}
@media (max-width: 560px) { .calc-result { padding: var(--sp-6); } }
.calc-kicker {
  font-size: var(--fs-xs);
  letter-spacing: var(--tr-wide);
  text-transform: uppercase;
  color: var(--text-3);
}
.calc-czk {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5.4vw, 3.7rem);
  font-weight: 600;
  letter-spacing: var(--tr-xxl);
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--accent);
}
.calc-kwh { font-size: var(--fs-sm); font-variant-numeric: tabular-nums; color: var(--text-2); }
.calc-note { margin-top: var(--sp-2); font-size: var(--fs-xs); line-height: 1.45; color: var(--text-3); }
.calc-result .btn { align-self: flex-start; margin-top: var(--sp-4); }

/* ---------- Applications --------------------------------------------------- */

.tiles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sp-4);
}
@media (max-width: 900px) { .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .tiles { grid-template-columns: 1fr; } }

.tile {
  display: flex;
  flex-direction: column;
  min-height: 15rem;
  padding: var(--sp-7);
  background: var(--bg-card);
  border: 1px solid var(--card-line);
  border-radius: var(--r-lg);
  transition: transform var(--dur-base) var(--ease), box-shadow var(--dur-base) var(--ease);
}
.tile:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.tile .icon {
  width: 30px; height: 30px;
  color: var(--accent);
  margin-bottom: auto;
}
.tile h3 {
  margin-top: var(--sp-6);
  font-size: var(--fs-lg);
  letter-spacing: var(--tr-lg);
}
.tile p { margin-top: var(--sp-3); font-size: var(--fs-sm); color: var(--text-2); }
.tile .tag {
  margin-top: var(--sp-4);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--tr-wide);
  color: var(--text-3);
}
.tile--tall { grid-row: span 2; }
@media (max-width: 900px) { .tile--tall { grid-row: span 1; } }

/* ---------- Water ------------------------------------------------------------ */

.spec-row {
  display: flex;
  gap: var(--sp-8);
  flex-wrap: wrap;
  margin-top: var(--sp-7);
}
.spec-row div { min-width: 7rem; }
.spec-row .label {
  display: block;
  font-size: var(--fs-xs);
  letter-spacing: var(--tr-wide);
  text-transform: uppercase;
  color: var(--text-3);
}
.spec-row .val {
  display: block;
  margin-top: var(--sp-2);
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 600;
  letter-spacing: var(--tr-lg);
  font-variant-numeric: tabular-nums;
  color: var(--text);
}
.spec-row .val .u { font-size: var(--fs-sm); font-weight: 400; color: var(--accent); }

/* ---------- Benefits / process ------------------------------------------------ */

.trio {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--sp-8) var(--sp-7);
}
@media (max-width: 820px) { .trio { grid-template-columns: 1fr; gap: var(--sp-7); } }

.trio-item { padding-top: var(--sp-5); border-top: 1px solid var(--line); }
.trio-item .n {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tr-wide);
  color: var(--accent);
}
.trio-item h3 { margin-top: var(--sp-4); font-size: var(--fs-lg); letter-spacing: var(--tr-lg); }
.trio-item p { margin-top: var(--sp-3); font-size: var(--fs-sm); color: var(--text-2); }

/* ---------- FAQ ---------------------------------------------------------------- */

.faq { max-width: 52rem; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--line-soft); }
.faq-item:first-child { border-top: 1px solid var(--line-soft); }
.faq-item dt {
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 600;
  letter-spacing: var(--tr-lg);
  padding: var(--sp-6) 0 0;
}
.faq-item dd {
  padding: var(--sp-3) 0 var(--sp-6);
  font-size: var(--fs-body);
  color: var(--text-2);
  max-width: 54ch;
}

/* ---------- Contact ------------------------------------------------------------ */

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: var(--sp-9);
  align-items: start;
}
@media (max-width: 900px) { .contact-grid { grid-template-columns: 1fr; gap: var(--sp-7); } }

.contact-direct { margin-top: var(--sp-7); display: grid; gap: var(--sp-4); }
.contact-direct a {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  width: fit-content;
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 600;
  letter-spacing: var(--tr-lg);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}
.contact-direct a:hover { color: var(--accent); }
.contact-direct svg { width: 18px; height: 18px; color: var(--accent); flex: none; }
.contact-direct .hours { font-size: var(--fs-sm); color: var(--text-3); }

.panel {
  padding: var(--sp-8);
  background: var(--bg-card);
  border: 1px solid var(--card-line);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-lg);
}
@media (max-width: 560px) { .panel { padding: var(--sp-5); border-radius: var(--r-lg); } }

.fields { display: grid; grid-template-columns: 1fr 1fr; gap: var(--sp-5); }
@media (max-width: 620px) { .fields { grid-template-columns: 1fr; } }
.field { display: grid; gap: var(--sp-2); }
.field--full { grid-column: 1 / -1; }

.field label {
  font-size: var(--fs-xs);
  font-weight: 500;
  color: var(--text-2);
}
.field label .opt { color: var(--text-3); font-weight: 400; }

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0.8rem 0.95rem;
  background: var(--field-bg);
  color: var(--text);
  border: 1px solid var(--field-line);
  border-radius: var(--r-sm);
  font-size: var(--fs-body);
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.field textarea { resize: vertical; min-height: 7rem; line-height: 1.5; }
.field input::placeholder, .field textarea::placeholder { color: var(--field-placeholder); }
.field select {
  appearance: none;
  cursor: pointer;
  background-image: linear-gradient(45deg, transparent 50%, currentColor 50%),
                    linear-gradient(135deg, currentColor 50%, transparent 50%);
  background-position: right 1.1rem center, right 0.8rem center;
  background-size: 5px 5px, 5px 5px;
  background-repeat: no-repeat;
  padding-right: 2.3rem;
}
.field :is(input, select, textarea):focus-visible {
  outline: none;
  border-color: var(--field-line-focus);
  box-shadow: 0 0 0 4px var(--accent-wash);
}
.field[data-invalid='true'] :is(input, select, textarea) { border-color: var(--danger); }
.field .err { font-size: var(--fs-xs); color: var(--danger); }
.field .err:empty { display: none; }

/* Visually gone but not display:none, so a naive bot still fills it. */
.hp {
  position: absolute;
  left: -9999px;
  width: 1px; height: 1px;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
}

.consent {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--sp-3);
  align-items: start;
  font-size: var(--fs-sm);
  color: var(--text-2);
}
.consent label { display: inline; font-size: inherit; }
.consent input[type='checkbox'] {
  width: 1.1rem; height: 1.1rem;
  margin-top: 0.12rem;
  accent-color: var(--accent);
  cursor: pointer;
}
.consent a { color: var(--accent); text-underline-offset: 2px; }
.consent .err { grid-column: 2; }

.challenge { grid-column: 1 / -1; }
.challenge[hidden] { display: none; }

.form-actions {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-4);
  flex-wrap: wrap;
}
.form-hint { font-size: var(--fs-xs); color: var(--text-3); }

.form-status {
  grid-column: 1 / -1;
  font-size: var(--fs-sm);
  line-height: 1.45;
  padding: var(--sp-4);
  border-radius: var(--r-sm);
  border: 1px solid var(--line);
  background: var(--bg-inset);
}
/* Collapsed rather than display:none — a live region removed from the tree
   would not announce its first message. */
.form-status:empty { padding: 0; border: none; }
.form-status[data-tone='ok'] { border-color: var(--ok); color: var(--ok); }
.form-status[data-tone='error'] { border-color: var(--danger); color: var(--danger); }
.form-status[data-tone='pending'] { color: var(--text-2); }

.spinner {
  width: 14px; height: 14px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Footer ------------------------------------------------------------- */

footer {
  padding: var(--sp-8) 0;
  background: var(--bg-sunken);
  border-top: 1px solid var(--line-soft);
  font-size: var(--fs-xs);
  color: var(--text-3);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--sp-5);
  flex-wrap: wrap;
}
.footer-links { display: flex; gap: var(--sp-6); flex-wrap: wrap; }
.footer-links a { text-decoration: none; transition: color var(--dur-fast) var(--ease); }
.footer-links a:hover { color: var(--text); }

/* ---------- Artwork ------------------------------------------------------------
   An SVG presentation attribute cannot hold a var(), so the drawings carry
   classes. That also makes them follow the .stage scope with no second set
   of shapes. Nothing here paints a shape that app.js also paints. */

.a-frame { fill: url(#grad-frame); }
.a-frame-edge { fill: none; stroke: var(--line); stroke-width: 1; }
.a-pocket-edge { stroke: var(--accent); stroke-width: 1; stroke-opacity: 0.35; fill: none; }
.a-dust { fill: var(--contaminant); }
.a-flow { fill: none; stroke: var(--text-3); stroke-width: 1.4; stroke-linecap: round; }
.a-flow--clean { stroke: var(--accent); stroke-opacity: 0.8; }
.a-label {
  fill: var(--text-3);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}
.a-label--accent { fill: var(--accent); }
.a-core { fill: none; stroke: var(--line); stroke-width: 1.2; stroke-dasharray: 4 6; }
.a-wound-bg { fill: var(--bg-inset); }
.a-wound-line { stroke: var(--accent); stroke-width: 3; opacity: 0.32; }
.a-shell { fill: var(--bg-inset); stroke: var(--line); stroke-width: 1.4; }

/* Gradient stops — referenced by <stop> elements inside the SVGs.
   The frame needs its own two tones: --bg-inset against a white section is
   almost invisible, and the flange has to read as a solid object. */
.g-frame-a { stop-color: var(--frame-lit); }
.g-frame-b { stop-color: var(--frame-shade); }
.g-pocket-near { stop-color: var(--accent); stop-opacity: 0.55; }
.g-pocket-mid { stop-color: var(--accent); stop-opacity: 0.28; }
.g-pocket-far { stop-color: var(--accent); stop-opacity: 0.07; }

/* ---------- Utilities ------------------------------------------------------------ */

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* Hidden-before-reveal only when JS is present: head.js stamps .js on <html>
   before first paint, so a scriptless visitor gets the whole page. */
.js [data-reveal] { opacity: 0; transform: translateY(1.25rem); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
  .hero h1 .line > span { transform: none; }
}