/* ============================================================================
   NIMBUS MARKETING SITE
   Depends on tokens.css. Never hardcode a colour here that is not a token.
   Shape rule in force: buttons/chips = pill, cards = --r-lg, panels = --r-xl.
   ========================================================================== */

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--canvas);
  color: var(--body);
  font: var(--t-body);
  letter-spacing: var(--tracking-tight);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 { color: var(--ink); margin: 0; letter-spacing: var(--tracking-display); }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img, svg { max-width: 100%; }

:focus-visible {
  outline: none;
  box-shadow: var(--ring);
  border-radius: var(--r-sm);
}

.skip-link {
  position: absolute; left: var(--s-4); top: -100px;
  z-index: var(--z-toast);
  padding: var(--s-3) var(--s-5);
  background: var(--surface); color: var(--ink);
  border-radius: var(--r-pill); box-shadow: var(--e-3);
  font: var(--t-label);
  transition: top var(--d-fast) var(--ease-out);
}
.skip-link:focus { top: var(--s-4); }

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

/* ---------------------------------------------------------------- glass --- */
.glass {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(170%);
  backdrop-filter: blur(var(--glass-blur)) saturate(170%);
  border: 1px solid var(--glass-stroke);
  box-shadow: inset 0 1px 0 var(--glass-inner), var(--e-3);
}
.glass-strong {
  background: var(--glass-bg-2);
  -webkit-backdrop-filter: blur(calc(var(--glass-blur) * 1.4)) saturate(180%);
  backdrop-filter: blur(calc(var(--glass-blur) * 1.4)) saturate(180%);
  border: 1px solid var(--glass-stroke);
  box-shadow: inset 0 1px 0 var(--glass-inner), var(--e-4);
}

/* -------------------------------------------------------------- buttons --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: var(--s-2);
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: var(--r-pill);
  font: var(--t-label);
  cursor: pointer;
  transition: transform var(--d-fast) var(--ease-out),
              background var(--d-fast) var(--ease-out),
              box-shadow var(--d-fast) var(--ease-out),
              border-color var(--d-fast) var(--ease-out);
}
.btn-sm { padding: 9px 18px; }
.btn-lg { padding: 15px 28px; font-size: 0.9375rem; }
.btn:not(.btn-sm):not(.btn-lg) { padding: 12px 22px; }
.btn-block { width: 100%; }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0) scale(0.985); }

.btn-primary { background: var(--brand); color: var(--on-brand); box-shadow: var(--e-2); }
.btn-primary:hover { background: var(--brand-600); box-shadow: var(--e-3); }

.btn-ghost {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--hairline);
  box-shadow: var(--e-1);
}
.btn-ghost:hover { background: var(--surface-2); border-color: var(--brand-200); }

/* On the photographic sky these need their own opaque scrim for AA contrast. */
.btn-light { background: #ffffff; color: #0c1830; box-shadow: var(--e-3); }
.btn-light:hover { background: var(--brand-50); }
.btn-outline-light {
  background: rgba(10, 24, 52, 0.30);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.55);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}
.btn-outline-light:hover { background: rgba(10, 24, 52, 0.45); border-color: #ffffff; }

.btn em { font-style: normal; opacity: 0.7; font-weight: 450; }

/* ------------------------------------------------------------------ nav --- */
.nav-wrap {
  position: fixed; inset: var(--s-4) 0 auto;
  z-index: var(--z-sticky);
  display: flex; justify-content: center;
  padding: 0 var(--gutter);
  pointer-events: none;
}
.nav {
  pointer-events: auto;
  width: 100%;
  max-width: var(--page-max);
  height: 64px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--s-5);
  padding: 0 10px 0 20px;
  border-radius: var(--r-pill);
  transition: background var(--d-base) var(--ease-out),
              box-shadow var(--d-base) var(--ease-out);
}
/* Over the sky the nav is translucent white; once scrolled past the hero it
   picks up the page surface so text keeps contrast. */
.nav-wrap:not(.scrolled) .nav {
  background: rgba(12, 30, 68, 0.22);
  border-color: rgba(255, 255, 255, 0.30);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28), 0 10px 40px -18px rgba(8, 24, 60, 0.5);
}
.nav-wrap:not(.scrolled) .nav,
.nav-wrap:not(.scrolled) .nav a,
.nav-wrap:not(.scrolled) .brand-word { color: #ffffff; }
.nav-wrap:not(.scrolled) .nav-links a:hover { color: #ffffff; background: rgba(255,255,255,0.18); }
.nav-wrap:not(.scrolled) .theme-toggle { color: #ffffff; border-color: rgba(255,255,255,0.34); }

.brand { display: inline-flex; align-items: center; gap: 10px; }
.brand-mark { display: grid; place-items: center; }
.brand-word { font: var(--t-title-md); letter-spacing: 0.01em; color: var(--ink); }

.nav-links { display: flex; justify-content: center; gap: var(--s-1); }
.nav-links a {
  display: block;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  font: var(--t-label);
  color: var(--body);
  transition: background var(--d-fast) var(--ease-out), color var(--d-fast) var(--ease-out);
}
.nav-links a:hover { background: var(--surface-2); color: var(--ink); }

.nav-actions { display: flex; align-items: center; gap: var(--s-2); }
.theme-toggle {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: var(--r-pill);
  border: 1px solid var(--hairline);
  background: transparent;
  color: var(--body);
  font-size: 1.05rem;
  cursor: pointer;
  transition: background var(--d-fast) var(--ease-out), color var(--d-fast) var(--ease-out);
}
.theme-toggle:hover { background: var(--surface-2); color: var(--ink); }

/* ----------------------------------------------------------------- hero --- */
.hero {
  position: relative;
  min-height: 100dvh;
  display: grid;
  grid-template-rows: 1fr auto;
  padding: 148px var(--gutter) 0;
  isolation: isolate;
}

.sky { position: absolute; inset: 0; z-index: -1; overflow: hidden; }

/* ---------------------------------------------------------------------------
   THE SKY
   The hero sits on a real photograph, not a gradient and not procedural noise.
   Four stacked layers, bottom to top:
     .sky-photo  the photograph, cover-fit, slowly drifting
     .sky-tint   a brand-blue wash that ties the photo to the palette
     .sky-scrim  a top gradient that guarantees nav and headline contrast
     .sky-fade   the dissolve into the page canvas at the bottom
   Day and night are separate files chosen by theme, so a viewer only ever
   downloads the one they see. `image-set` serves WebP where supported; the
   plain url() above it is the fallback older browsers keep.
   ------------------------------------------------------------------------ */
.sky-photo, .dl-sky {
  position: absolute; inset: 0;
  background-repeat: no-repeat;
  background-position: center 38%;
  background-size: cover;
  background-color: var(--sky-mid);
  will-change: transform;
}

.sky-photo {
  background-image: url("../assets/sky-day.jpg");
  background-image: image-set(
    url("../assets/sky-day.webp") type("image/webp"),
    url("../assets/sky-day.jpg")  type("image/jpeg"));
}
.dl-sky {
  z-index: -1;
  opacity: 0.85;
  background-image: url("../assets/sky-day-sm.jpg");
  background-image: image-set(
    url("../assets/sky-day-sm.webp") type("image/webp"),
    url("../assets/sky-day-sm.jpg")  type("image/jpeg"));
}

/* Phones get the half-size file. At 390px wide the 2400px image is three
   times more pixels than the screen can show. */
@media (max-width: 760px) {
  .sky-photo {
    background-image: url("../assets/sky-day-sm.jpg");
    background-image: image-set(
      url("../assets/sky-day-sm.webp") type("image/webp"),
      url("../assets/sky-day-sm.jpg")  type("image/jpeg"));
  }
}

.sky-tint {
  position: absolute; inset: 0;
  background:
    radial-gradient(120% 86% at 50% 120%, color-mix(in oklab, var(--sky-haze) 62%, transparent), transparent 62%),
    linear-gradient(176deg,
      color-mix(in oklab, var(--brand-800) 30%, transparent) 0%,
      transparent 46%,
      color-mix(in oklab, var(--sky-low) 22%, transparent) 100%);
  /* soft-light, not multiply: it warms and unifies the photograph with the
     brand palette without crushing the clouds into a flat blue slab. */
  mix-blend-mode: soft-light;
  opacity: 0.8;
}

.sky-scrim {
  position: absolute; left: 0; right: 0; top: 0; height: 280px;
  background: linear-gradient(to bottom, rgba(8, 22, 54, 0.42), rgba(8, 22, 54, 0.12) 55%, transparent);
}

.sky-fade {
  position: absolute; left: 0; right: 0; bottom: 0; height: 44%;
  background: linear-gradient(to bottom, transparent, var(--canvas) 95%);
}

/* A very slow drift. The scale headroom keeps the edges off screen, and only
   `transform` animates, on a promoted layer, so this composites on the GPU. */
@media (prefers-reduced-motion: no-preference) {
  .sky-photo { animation: sky-drift 150s ease-in-out infinite; }
}
@keyframes sky-drift {
  from { transform: scale(1.06) translate3d(-1.2%, 0, 0); }
  50%  { transform: scale(1.11) translate3d(1.4%, -1%, 0); }
  to   { transform: scale(1.06) translate3d(-1.2%, 0, 0); }
}

/* --- night ------------------------------------------------------------- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .sky-photo {
    background-image: url("../assets/sky-night.jpg");
    background-image: image-set(
      url("../assets/sky-night.webp") type("image/webp"),
      url("../assets/sky-night.jpg")  type("image/jpeg"));
  }
  :root:not([data-theme="light"]) .dl-sky {
    background-image: url("../assets/sky-night-sm.jpg");
    background-image: image-set(
      url("../assets/sky-night-sm.webp") type("image/webp"),
      url("../assets/sky-night-sm.jpg")  type("image/jpeg"));
  }
  :root:not([data-theme="light"]) .sky-tint { mix-blend-mode: normal; opacity: 0.5; }
}
:root[data-theme="dark"] .sky-photo {
  background-image: url("../assets/sky-night.jpg");
  background-image: image-set(
    url("../assets/sky-night.webp") type("image/webp"),
    url("../assets/sky-night.jpg")  type("image/jpeg"));
}
:root[data-theme="dark"] .dl-sky {
  background-image: url("../assets/sky-night-sm.jpg");
  background-image: image-set(
    url("../assets/sky-night-sm.webp") type("image/webp"),
    url("../assets/sky-night-sm.jpg")  type("image/jpeg"));
}
:root[data-theme="dark"] .sky-tint { mix-blend-mode: normal; opacity: 0.5; }

.hero-copy { max-width: 1000px; margin: 0 auto; text-align: center; }
.hero-title {
  font: var(--t-display-xl);
  color: #ffffff;
  text-shadow: 0 2px 10px rgba(8, 26, 62, 0.30), 0 4px 40px rgba(8, 26, 62, 0.45);
  margin-bottom: var(--s-5);
}
.hero-sub {
  max-width: 54ch; margin: 0 auto var(--s-7);
  font-size: 1.0625rem; line-height: 1.6;
  color: #ffffff;
  /* Two shadows: a tight one for edge definition against bright cloud, and a
     wide soft one that acts as a local scrim. The subhead is the smallest
     white text on the photograph, so it needs the most help. */
  text-shadow: 0 1px 3px rgba(8, 26, 62, 0.45), 0 2px 26px rgba(8, 26, 62, 0.65);
}
.hero-cta { display: flex; flex-wrap: wrap; gap: var(--s-3); justify-content: center; }
.hero-cta .btn-ghost {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.50);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  box-shadow: none;
}
.hero-cta .btn-ghost:hover { background: rgba(255, 255, 255, 0.26); border-color: #ffffff; }

/* ------------------------------------------------------- live preview ----- */
.preview-wrap { max-width: var(--page-max); margin: var(--s-10) auto 0; width: 100%; }
.preview {
  border-radius: var(--r-xl);
  overflow: hidden;
  transform: translateY(0);
}
.pv-chrome {
  display: flex; align-items: center; gap: var(--s-4);
  padding: 12px 18px;
  border-bottom: 1px solid var(--hairline-soft);
  background: var(--surface);
}
.pv-dots { display: inline-flex; gap: 6px; }
.pv-dots i { width: 10px; height: 10px; border-radius: var(--r-pill); background: var(--surface-3); }
.pv-title { font: var(--t-caption); color: var(--muted); }

.pv-body {
  display: grid;
  grid-template-columns: 172px 1fr 190px;
  background: var(--surface);
  min-height: 390px;
}
.pv-rail { display: flex; flex-direction: column; gap: 2px; padding: var(--s-4); border-right: 1px solid var(--hairline-soft); }
.pv-rail-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px; border-radius: var(--r-md);
  font: var(--t-label); color: var(--muted);
}
.pv-rail-item i { font-size: 1.05rem; }
.pv-rail-item.is-active { background: var(--brand-50); color: var(--brand-700); }

.pv-main { padding: var(--s-5); display: flex; flex-direction: column; gap: var(--s-4); }
.pv-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-3); }
.pv-stat {
  padding: var(--s-3) var(--s-4);
  border-radius: var(--r-md);
  background: var(--surface-2);
  display: flex; flex-direction: column; gap: 2px;
}
.pv-stat-n { font-family: var(--font-mono); font-size: 1.35rem; font-weight: 500; color: var(--ink); font-variant-numeric: tabular-nums; }
.pv-stat-l { font: var(--t-caption); color: var(--muted); }

.pv-card-stage { perspective: 1400px; flex: 1; display: grid; }
.pv-card {
  position: relative;
  width: 100%;
  min-height: 160px;
  border: 0; padding: 0;
  background: transparent;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform var(--d-slow) var(--ease-in-out);
  font: inherit; text-align: left;
}
.pv-card.flipped { transform: rotateX(180deg); }
.pv-card-face {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; gap: 10px; justify-content: center;
  padding: var(--s-6);
  border-radius: var(--r-lg);
  border: 1px solid var(--hairline);
  background: var(--surface);
  box-shadow: var(--e-2);
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}
.pv-back { transform: rotateX(180deg); background: var(--brand-50); border-color: var(--brand-200); }
.pv-kicker { font: var(--t-caption); text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); }
.pv-q, .pv-a { font: var(--t-title-lg); color: var(--ink); }
.pv-hint { font: var(--t-caption); color: var(--muted); margin-top: auto; }

.pv-grades { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s-2); }
.pv-grade {
  display: flex; flex-direction: column; gap: 2px; align-items: center;
  padding: 10px 6px;
  border-radius: var(--r-md);
  border: 1px solid var(--hairline);
  background: var(--surface);
  color: var(--ink);
  font: var(--t-label);
  cursor: pointer;
  transition: background var(--d-fast) var(--ease-out), border-color var(--d-fast) var(--ease-out), transform var(--d-fast) var(--ease-out);
}
.pv-grade em { font-style: normal; font-family: var(--font-mono); font-size: 0.6875rem; color: var(--muted); }
.pv-grade:hover { border-color: var(--brand-300); background: var(--brand-50); transform: translateY(-1px); }
.pv-grade:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

.pv-side { padding: var(--s-5) var(--s-4); border-left: 1px solid var(--hairline-soft); display: flex; flex-direction: column; gap: var(--s-3); }
.pv-side-h { font: var(--t-caption); text-transform: uppercase; letter-spacing: 0.09em; color: var(--muted); }
.pv-heat { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.pv-heat span { aspect-ratio: 1; border-radius: 3px; background: var(--surface-3); }
.pv-spark { width: 100%; height: 54px; }

/* ---------------------------------------------------------------- band ---- */
.band {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: var(--s-11) var(--gutter) var(--s-9);
}
.band-lede {
  max-width: 62ch;
  font: var(--t-title-lg);
  font-weight: 500;
  color: var(--ink);
  margin-bottom: var(--s-8);
}
.band-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: var(--s-6);
  border-top: 1px solid var(--hairline);
  padding-top: var(--s-6);
}
.band-list li { display: flex; flex-direction: column; gap: 6px; }
.band-list strong { font: var(--t-title-sm); color: var(--ink); }
.band-list span { font: var(--t-body-sm); color: var(--muted); }

/* ------------------------------------------------------------- section ---- */
/* Anchor links must not drop the heading under the fixed nav. */
.section, .band, .download { scroll-margin-top: 104px; }
.section { max-width: var(--page-max); margin: 0 auto; padding: var(--s-11) var(--gutter); }
.h-display { font: var(--t-display-lg); }
.center-head { text-align: center; max-width: 18ch; margin: 0 auto var(--s-9); }
.lede { max-width: 62ch; font-size: 1.0625rem; line-height: 1.62; color: var(--muted); }
.eyebrow {
  font: var(--t-caption);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--brand);
  margin-bottom: var(--s-3);
}

/* ---------------------------------------------------------- method/curve -- */
.method-head { max-width: 760px; }
.method-head .h-display { margin-bottom: var(--s-4); }
.curve-fig { margin: var(--s-8) 0 0; }
.curve {
  width: 100%; height: auto;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  box-shadow: var(--e-2);
  padding: 0;
}
.c-massed { stroke: var(--muted); stroke-width: 2; stroke-dasharray: 5 6; }
.c-spaced { stroke: var(--brand); stroke-width: 3; stroke-linecap: round; }
.c-fill { fill: var(--brand); opacity: 0.08; }
.curve-grid-line { stroke: var(--hairline-soft); stroke-width: 1; }
.curve-label { fill: var(--muted); font: 11px var(--font-mono); }
.curve-mark { fill: var(--surface); stroke: var(--brand); stroke-width: 2.5; }

.curve-legend { display: flex; flex-wrap: wrap; gap: var(--s-5); margin-top: var(--s-4); }
.lg { display: inline-flex; align-items: center; gap: 8px; font: var(--t-body-sm); color: var(--muted); }
.lg::before { content: ""; width: 22px; height: 3px; border-radius: var(--r-pill); }
.lg-massed::before { background: var(--muted); }
.lg-spaced::before { background: var(--brand); }

.curve-ctl {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-5) var(--s-7);
  margin-top: var(--s-7);
  padding-top: var(--s-6);
  border-top: 1px solid var(--hairline);
}
.ctl { display: grid; gap: 8px; font: var(--t-label); color: var(--ink); }
.ctl output { font-size: 0.8125rem; color: var(--brand); }
.ctl-read { grid-column: 1 / -1; font: var(--t-body-sm); color: var(--muted); max-width: 70ch; }

input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 4px;
  border-radius: var(--r-pill);
  background: var(--surface-3);
  cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 20px; height: 20px; border-radius: var(--r-pill);
  background: var(--brand); border: 3px solid var(--surface);
  box-shadow: var(--e-2);
}
input[type="range"]::-moz-range-thumb {
  width: 20px; height: 20px; border-radius: var(--r-pill);
  background: var(--brand); border: 3px solid var(--surface);
  box-shadow: var(--e-2);
}

/* ---------------------------------------------------------------- bento --- */
.bento {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--s-4);
}
.cell {
  display: flex; flex-direction: column; gap: 10px;
  padding: var(--s-6);
  border-radius: var(--r-lg);
  border: 1px solid var(--hairline);
  background: var(--surface);
  box-shadow: var(--e-1);
  transition: transform var(--d-base) var(--ease-out), box-shadow var(--d-base) var(--ease-out);
}
.cell:hover { transform: translateY(-3px); box-shadow: var(--e-3); }
.cell h3 { font: var(--t-title-md); }
.cell p { font: var(--t-body-sm); color: var(--muted); }

.cell-a { grid-column: span 3; }
.cell-b { grid-column: span 3; }
.cell-c { grid-column: span 2; }
.cell-d { grid-column: span 2; }
.cell-e { grid-column: span 2; }

.cell-visual {
  border-radius: var(--r-md);
  margin-bottom: var(--s-2);
  overflow: hidden;
  position: relative;
}
.cell-visual-grad {
  aspect-ratio: 16 / 7;
  background: linear-gradient(145deg, var(--brand-700), var(--brand) 55%, var(--sky-mid));
  display: grid; place-items: center;
  padding: var(--s-4);
}
.mini-match { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; width: 100%; }
.mini-match span {
  display: grid; place-items: center;
  aspect-ratio: 7 / 4;
  border-radius: var(--r-xs);
  background: rgba(255, 255, 255, 0.17);
  border: 1px solid rgba(255, 255, 255, 0.26);
  color: #ffffff;
  font: 500 0.6875rem/1 var(--font-sans);
  transition: background var(--d-fast) var(--ease-out), transform var(--d-fast) var(--ease-out);
}
.mini-match span.lit { background: rgba(255, 255, 255, 0.86); color: var(--brand-700); transform: scale(1.04); }
.mini-match span.gone { opacity: 0.18; }

.cell-code {
  margin: auto 0 0;
  padding: var(--s-4);
  border-radius: var(--r-md);
  background: var(--surface-2);
  border: 1px solid var(--hairline-soft);
  font: 400 0.75rem/1.75 var(--font-mono);
  color: var(--body);
  overflow-x: auto;
}
.cell-stat { margin-bottom: auto; font-size: 3rem; font-weight: 500; color: var(--brand); line-height: 1; }

.cell-visual-ring {
  aspect-ratio: 1 / 1;
  max-width: 104px;
  display: grid; place-items: center;
  background: transparent;
}
.focus-ring { grid-area: 1 / 1; width: 104px; height: 104px; transform: rotate(-90deg); }
.fr-track { fill: none; stroke: var(--surface-3); stroke-width: 9; }
.fr-fill {
  fill: none; stroke: var(--brand); stroke-width: 9; stroke-linecap: round;
  stroke-dasharray: 327; stroke-dashoffset: 82;
  transition: stroke-dashoffset 1s linear;
}
.focus-time { grid-area: 1 / 1; font-size: 1.0625rem; color: var(--ink); }

/* ---------------------------------------------------------------- modes --- */
.modes-head { max-width: 620px; margin-bottom: var(--s-8); }
.modes-head .h-display { margin-bottom: var(--s-3); }
.rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(268px, 1fr);
  gap: var(--s-4);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: var(--s-4);
  margin-inline: calc(var(--gutter) * -1);
  padding-inline: var(--gutter);
  scrollbar-width: thin;
}
.mode {
  scroll-snap-align: start;
  display: flex; flex-direction: column; gap: 10px;
  padding: var(--s-6);
  border-radius: var(--r-lg);
  background: var(--surface);
  border: 1px solid var(--hairline);
  box-shadow: var(--e-1);
  transition: border-color var(--d-base) var(--ease-out), transform var(--d-base) var(--ease-out);
}
.mode:hover { border-color: var(--brand-300); transform: translateY(-3px); }
.mode i { font-size: 1.6rem; color: var(--brand); }
.mode h3 { font: var(--t-title-md); }
.mode p { font: var(--t-body-sm); color: var(--muted); flex: 1; }
.mode-cram { border-style: dashed; }
.mode-cram i { color: var(--warn); }
.mode-cram .mode-tag { background: color-mix(in oklab, var(--warn) 16%, transparent); color: var(--warn); }

.mode-tag {
  align-self: flex-start;
  padding: 5px 12px;
  border-radius: var(--r-pill);
  background: var(--brand-50);
  color: var(--brand-700);
  font: var(--t-caption);
  font-weight: 550;
}

/* ---------------------------------------------------------------- split --- */
.split {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: var(--s-10);
  align-items: center;
}
.split-copy .h-display { margin-bottom: var(--s-4); }
.ticks { display: grid; gap: 10px; margin-top: var(--s-6); }
.ticks li { display: flex; align-items: center; gap: 10px; font: var(--t-body-sm); color: var(--body); }
.ticks i { color: var(--brand); font-size: 1rem; }

.panel { border-radius: var(--r-xl); padding: var(--s-6); display: grid; gap: var(--s-3); }
.panel-head { display: flex; align-items: center; justify-content: space-between; }
.panel-title { font: var(--t-title-sm); color: var(--ink); }
.chip {
  padding: 5px 12px; border-radius: var(--r-pill);
  background: var(--brand-50); color: var(--brand-700);
  font-size: 0.75rem;
}
.forecast { width: 100%; height: auto; }
.fc-bar { fill: var(--brand); transition: fill var(--d-fast) var(--ease-out); }
.fc-bar:hover { fill: var(--brand-700); }
.fc-axis { fill: var(--muted); font: 9px var(--font-mono); }

.heat-year { display: grid; grid-auto-flow: column; grid-template-rows: repeat(7, 1fr); gap: 3px; }
.heat-year span { aspect-ratio: 1; border-radius: 2px; background: var(--surface-3); }

/* -------------------------------------------------------------- pricing --- */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-4); align-items: start; }
.plan {
  display: flex; flex-direction: column; gap: var(--s-3);
  padding: var(--s-7);
  border-radius: var(--r-lg);
  border: 1px solid var(--hairline);
  background: var(--surface);
  box-shadow: var(--e-1);
}
.plan-feature {
  border-color: var(--brand-300);
  box-shadow: var(--e-3);
  background: linear-gradient(180deg, var(--brand-50), var(--surface) 34%);
}
.plan-name { font: var(--t-title-md); }
.plan-price { display: flex; align-items: baseline; gap: 4px; color: var(--ink); }
.plan-price span { font-size: 2.4rem; font-weight: 500; line-height: 1; }
.plan-price em { font-style: normal; font: var(--t-body-sm); color: var(--muted); }
.plan-note { font: var(--t-body-sm); color: var(--muted); min-height: 2.6em; }
.plan-list { display: grid; gap: 9px; padding: var(--s-4) 0; margin-top: auto; border-top: 1px solid var(--hairline-soft); }
.plan-list li { font: var(--t-body-sm); color: var(--body); padding-left: 22px; position: relative; }
.plan-list li::before {
  content: ""; position: absolute; left: 0; top: 0.52em;
  width: 11px; height: 6px;
  border-left: 2px solid var(--brand); border-bottom: 2px solid var(--brand);
  transform: rotate(-45deg);
}

/* ------------------------------------------------------------- download --- */
.download {
  position: relative;
  margin: var(--s-9) var(--gutter) 0;
  border-radius: 34px;
  overflow: hidden;
  isolation: isolate;
  background: linear-gradient(170deg, var(--brand-800), var(--brand-600) 48%, var(--sky-mid));
}
/* Scrim over the photograph. Same z-index as .dl-sky but declared later, so it
   paints above it; the band's white copy needs a consistent ground rather than
   whatever cloud happens to sit behind a given line. */
.download::after {
  content: "";
  position: absolute; inset: 0; z-index: -1;
  pointer-events: none;
  background: linear-gradient(168deg,
    color-mix(in oklab, var(--brand-800) 72%, transparent),
    color-mix(in oklab, var(--brand-600) 46%, transparent) 55%,
    color-mix(in oklab, var(--brand-700) 60%, transparent));
}

.dl-inner { padding: clamp(56px, 8vw, 104px) var(--gutter); text-align: center; }
.dl-title { font: var(--t-display-md); color: #ffffff; margin-bottom: var(--s-3); }
.dl-sub { max-width: 52ch; margin: 0 auto var(--s-7); color: rgba(255, 255, 255, 0.88); font-size: 1rem; }
.dl-buttons { display: flex; flex-wrap: wrap; gap: var(--s-3); justify-content: center; }
.dl-buttons .btn { flex-direction: row; }
.dl-buttons span { display: flex; flex-direction: column; align-items: flex-start; line-height: 1.2; }
.dl-buttons em { font-size: 0.6875rem; }
.dl-meta { margin-top: var(--s-6); font: var(--t-body-sm); color: rgba(255, 255, 255, 0.72); }

/* --------------------------------------------------------------- footer --- */
.footer { max-width: var(--page-max); margin: 0 auto; padding: var(--s-11) var(--gutter) var(--s-7); }
.footer-inner { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr); gap: var(--s-9); }
.footer-brand p { font: var(--t-body-sm); color: var(--muted); max-width: 34ch; margin-top: 10px; }
.footer-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-6); }
.footer-cols h4 { font: var(--t-caption); text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); margin-bottom: var(--s-3); }
.footer-cols a { display: block; padding: 5px 0; font: var(--t-body-sm); color: var(--body); }
.footer-cols a:hover { color: var(--brand); }
.footer-base {
  display: flex; justify-content: space-between; gap: var(--s-4); flex-wrap: wrap;
  margin-top: var(--s-9); padding-top: var(--s-5);
  border-top: 1px solid var(--hairline);
  font: var(--t-caption); color: var(--muted);
}

/* ------------------------------------------------------- scroll reveals --- */
@media (prefers-reduced-motion: no-preference) {
  [data-reveal] {
    opacity: 0;
    transform: translateY(22px);
    transition: opacity var(--d-slow) var(--ease-out), transform var(--d-slow) var(--ease-out);
  }
  [data-reveal].in { opacity: 1; transform: none; }
}

/* ----------------------------------------------------------- responsive --- */
@media (max-width: 1080px) {
  .pv-body { grid-template-columns: 148px 1fr; }
  .pv-side { display: none; }
  .split { grid-template-columns: 1fr; gap: var(--s-8); }
}

@media (max-width: 880px) {
  .nav-links { display: none; }
  .nav { grid-template-columns: auto 1fr; }
  .nav-actions { justify-self: end; }
  .hero { padding-top: 128px; }
  .bento { grid-template-columns: repeat(2, 1fr); }
  .cell-a, .cell-b, .cell-c, .cell-d, .cell-e { grid-column: span 2; }
  .plans { grid-template-columns: 1fr; }
  .curve-ctl { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: var(--s-7); }
}

@media (max-width: 620px) {
  .pv-body { grid-template-columns: 1fr; min-height: 0; }
  .pv-rail { flex-direction: row; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--hairline-soft); }
  .pv-rail-item { white-space: nowrap; }
  .pv-grades { grid-template-columns: repeat(2, 1fr); }
  .hero-cta .btn { width: 100%; }
  .dl-buttons .btn { width: 100%; }
  .footer-cols { grid-template-columns: 1fr 1fr; }
}