/* ============================================================
   Snow Flow Co — Landing page
   Implements "Snow Flow Co Landing (direction 3a)" design handoff.
   Sections are full-bleed with an .sf-inner max-width wrapper for
   content, matching river-flow-co's .section / .section-inner
   pattern, not a whole-page shell.
   ============================================================ */

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--sf-page);
  font-family: var(--sf-sans);
  color: var(--sf-text);
}

a { color: var(--sf-blue); text-decoration: none; }
a:hover { color: var(--sf-blue-deep); }

em { font-style: italic; color: var(--sf-blue-soft); }

.sf-inner { max-width: 1108px; margin: 0 auto; }

@keyframes sfPing {
  0%   { transform: scale(1);   opacity: .45; }
  75%  { transform: scale(2.4); opacity: 0; }
  100% { transform: scale(2.4); opacity: 0; }
}

/* ── Nav ─────────────────────────────────────────────────── */
.sf-nav {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  height: 60px; padding: 0 36px;
  background: rgba(26, 27, 29, .8);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--sf-hairline);
}
.sf-nav-brand { display: flex; align-items: center; gap: 11px; }
.sf-nav-wordmark { font: 500 18px/1 var(--sf-serif); color: #fff; letter-spacing: -.01em; }
.sf-nav-links { display: flex; align-items: center; gap: 26px; }
.sf-nav-link {
  font: 600 11px/1 var(--sf-sans); letter-spacing: .18em; text-transform: uppercase;
  color: var(--sf-text-label); cursor: default;
}
.sf-live-pill {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 12px; border-radius: 999px; background: var(--sf-blue-tint);
}
.sf-live-dot { position: relative; display: inline-flex; width: 6px; height: 6px; }
.sf-live-dot::before {
  content: ""; position: absolute; inset: 0; border-radius: 50%;
  background: var(--sf-blue); animation: sfPing 3s ease-out infinite;
}
.sf-live-dot::after {
  content: ""; position: relative; width: 6px; height: 6px; border-radius: 50%; background: var(--sf-blue);
}
.sf-live-label { font: 700 10px/1 var(--sf-sans); letter-spacing: .16em; color: var(--sf-blue); }

/* ── Hero ────────────────────────────────────────────────── */
.sf-hero {
  position: relative;
  overflow: hidden;
  background: #0B0F14;
  padding: 96px 36px 100px;
  display: flex; align-items: center; justify-content: center;
}
.sf-hero-video {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  width: 100%; height: 100%; object-fit: cover; object-position: center;
  opacity: 0;
  animation: sfHeroCrossfade 32s var(--sf-ease) infinite;
}
.sf-hero-video:first-of-type { animation-delay: 0s; }
.sf-hero-video:last-of-type { animation-delay: -16s; }
@keyframes sfHeroCrossfade {
  0%, 43.75%  { opacity: 1; }
  50%, 93.75% { opacity: 0; }
  100%        { opacity: 1; }
}
.sf-hero-overlay {
  position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 15, 20, .4) 0%, rgba(11, 15, 20, .18) 45%, rgba(11, 15, 20, .6) 100%);
}
.sf-hero-card {
  position: relative; z-index: 1;
  width: 100%; max-width: 720px;
  background: var(--sf-page) url(../img/topo-white-dense.svg) center -60px / 1400px auto no-repeat;
  border-radius: 22px;
  padding: 52px 56px 44px;
  box-shadow: 0 30px 80px -20px rgba(0, 0, 0, .55), 0 1px 0 rgba(255, 255, 255, .06) inset;
  display: flex; flex-direction: column; align-items: center; text-align: center;
}
.sf-eyebrow {
  display: flex; align-items: center; gap: 8px;
  font: 600 11px/1 var(--sf-sans); letter-spacing: .22em; text-transform: uppercase;
  color: var(--sf-text-muted);
}
.sf-eyebrow-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--sf-blue); }
.sf-hero h1 {
  margin: 22px 0 0; font: 400 clamp(40px, 6vw, 60px)/1.05 var(--sf-serif); letter-spacing: -.02em;
  color: #fff; max-width: 560px;
}
.sf-hero-lead {
  margin: 20px 0 0; font: 400 20px/1.5 var(--sf-serif); font-style: italic;
  color: var(--sf-text-body); max-width: 560px;
}
.sf-search {
  margin-top: 38px; display: flex; align-items: center; gap: 10px;
  width: 600px; max-width: 100%; min-width: 0; padding: 9px 9px 9px 26px; border-radius: 999px;
  background: var(--sf-card); border: 1.5px solid var(--sf-chip-border);
  box-shadow: 0 18px 44px -22px rgba(0, 0, 0, .7);
}
.sf-search input {
  flex: 1; min-width: 0; background: transparent; border: none; outline: none;
  font: 400 18px/1 var(--sf-serif); color: #fff;
}
.sf-search input::placeholder { color: var(--sf-text-label); }
.sf-search input:focus-visible { box-shadow: 0 0 0 4px var(--sf-blue-tint); border-radius: 999px; }
.sf-search-icon { flex: none; color: var(--sf-text-muted); }
.sf-search-btn {
  height: 44px; padding: 0 26px; border: none; border-radius: 999px;
  background: var(--sf-blue); color: #fff; font: 700 12px/1 var(--sf-sans);
  letter-spacing: .16em; text-transform: uppercase; cursor: pointer;
}
.sf-popular {
  margin-top: 26px; display: flex; align-items: center; flex-wrap: wrap; gap: 10px;
}
.sf-popular-label {
  font: 600 11px/1 var(--sf-sans); letter-spacing: .2em; text-transform: uppercase;
  color: var(--sf-text-label); margin-right: 2px;
}
.sf-popular-chip {
  position: relative; overflow: hidden; isolation: isolate;
  display: inline-flex; align-items: center;
  padding: 10px 22px;
  font: 500 14px/1 var(--sf-serif); color: #fff; text-decoration: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, .07);
  border: 1px solid rgba(255, 255, 255, .18);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .14) inset, 0 10px 24px -14px rgba(0, 0, 0, .65);
  transition: background var(--sf-dur-fast) var(--sf-ease), border-color var(--sf-dur-fast) var(--sf-ease),
              box-shadow var(--sf-dur-fast) var(--sf-ease), transform var(--sf-dur-fast) var(--sf-ease);
}
.sf-popular-chip::before {
  content: ""; position: absolute; inset: -70%; z-index: -1; pointer-events: none;
  background: radial-gradient(circle at 30% 25%, rgba(127, 178, 240, .55), transparent 65%);
}
.sf-popular-chip:hover {
  background: rgba(255, 255, 255, .12);
  border-color: rgba(127, 178, 240, .55);
  transform: translateY(-1px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .2) inset, 0 14px 30px -16px rgba(0, 0, 0, .75);
}

/* ── State browser ───────────────────────────────────────── */
.sf-section-alt { padding: 80px 36px; background: var(--sf-section-alt); border-top: 1px solid var(--sf-hairline); }
.sf-section-head {
  display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 28px; gap: 24px;
}
.sf-section-head h2 { margin: 14px 0 0; font: 400 40px/1.1 var(--sf-serif); letter-spacing: -.02em; color: #fff; }
.sf-section-caption {
  margin: 0; max-width: 300px; font: 400 15px/1.5 var(--sf-serif); font-style: italic;
  color: var(--sf-text-body); text-align: right;
}

.sf-chips { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 24px; }
.sf-chip {
  padding: 9px 20px; border-radius: 999px; font: 500 15px/1 var(--sf-serif);
  cursor: pointer; border: 1px solid transparent;
  transition: background var(--sf-dur-fast) var(--sf-ease), border-color var(--sf-dur-fast) var(--sf-ease),
              color var(--sf-dur-fast) var(--sf-ease), box-shadow var(--sf-dur-fast) var(--sf-ease);
}
.sf-chip.is-active {
  background: var(--sf-blue); color: #fff;
  box-shadow: 0 8px 22px -8px rgba(44, 123, 229, .85);
}
.sf-chip.is-active:hover {
  background: var(--sf-blue-deep);
  box-shadow: 0 10px 26px -6px rgba(44, 123, 229, 1);
}
.sf-chip.is-soon {
  background: var(--sf-chip-fill); border-color: var(--sf-chip-border); color: var(--sf-text-muted);
  cursor: default; display: inline-flex; align-items: center; gap: 8px;
}
.sf-chip.is-soon:hover {
  background: var(--sf-blue-tint); border-color: var(--sf-blue-soft); color: #fff;
}
.sf-chip.is-soon:hover .sf-soon-tag { color: var(--sf-blue-soft); border-color: rgba(127, 178, 240, .5); }
.sf-chip.is-soon .sf-soon-tag {
  font: 700 9px/1 var(--sf-sans); letter-spacing: .12em; text-transform: uppercase;
  color: var(--sf-text-faint); border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 999px; padding: 2px 6px;
  transition: color var(--sf-dur-fast) var(--sf-ease), border-color var(--sf-dur-fast) var(--sf-ease);
}
.sf-chip:focus-visible { outline: 2px solid var(--sf-blue-soft); outline-offset: 2px; }

.sf-browser { display: flex; gap: 24px; align-items: stretch; flex-wrap: wrap; }

.sf-map-panel {
  width: 640px; max-width: 100%; padding: 40px; border-radius: 22px;
  background: var(--sf-card); border: 1px solid var(--sf-border);
}
.sf-map-frame {
  position: relative; width: 560px; max-width: 100%; height: 412px;
  background: var(--sf-map-inner) url(../img/topo-co-white-strong.svg) center / cover;
  border: 1px solid var(--sf-map-border); border-radius: 4px; overflow: hidden;
}
.sf-map-scrim {
  position: absolute; inset: 0;
  background: linear-gradient(160deg, rgba(26, 27, 29, .06), rgba(26, 27, 29, .28));
}
.sf-map-marker {
  position: absolute; transform: translate(-50%, -50%);
  display: flex; align-items: center; gap: 7px; white-space: nowrap;
}
.sf-map-dot { position: relative; display: inline-flex; width: 9px; height: 9px; }
.sf-map-dot::before {
  content: ""; position: absolute; inset: 0; border-radius: 50%;
  background: var(--sf-blue); animation: sfPing 3s ease-out infinite;
}
.sf-map-dot::after {
  content: ""; position: relative; width: 9px; height: 9px; border-radius: 50%;
  background: var(--sf-blue); box-shadow: 0 0 0 4px rgba(44, 123, 229, .22);
}
.sf-map-marker.is-selected .sf-map-dot { width: 11px; height: 11px; }
.sf-map-marker.is-selected .sf-map-dot::before { background: var(--sf-blue-soft); animation-duration: 2.4s; }
.sf-map-marker.is-selected .sf-map-dot::after {
  width: 11px; height: 11px; background: #fff; box-shadow: 0 0 0 4px rgba(255, 255, 255, .32);
}
.sf-map-marker-label {
  font: 600 10px/1 var(--sf-sans); letter-spacing: .09em; text-transform: uppercase;
  color: rgba(255, 255, 255, .95);
}
.sf-map-marker.is-selected .sf-map-marker-label { font-weight: 700; color: #fff; }
.sf-map-city { position: absolute; transform: translate(-50%, -50%); display: flex; align-items: center; gap: 6px; }
.sf-map-city-dot { width: 4px; height: 4px; border-radius: 50%; background: var(--sf-text-label); }
.sf-map-city-label {
  font: 500 9px/1 var(--sf-sans); letter-spacing: .14em; text-transform: uppercase; color: var(--sf-text-label);
}
.sf-map-caption {
  position: absolute; left: 16px; bottom: 14px;
  font: 600 9px/1 var(--sf-sans); letter-spacing: .2em; text-transform: uppercase; color: var(--sf-text-label);
}

.sf-station-panel {
  position: relative; overflow: hidden;
  flex: 1; min-width: 280px; padding: 34px; border-radius: 22px;
  background: var(--sf-card);
  border: 1px solid var(--sf-border);
  display: flex; flex-direction: column;
}
.sf-station-label { font: 600 10px/1 var(--sf-sans); letter-spacing: .22em; text-transform: uppercase; color: var(--sf-text-muted); }
.sf-station-name { margin: 12px 0 2px; font: 400 30px/1.05 var(--sf-serif); color: var(--sf-blue-soft); }
.sf-station-meta { font: 400 14px/1.4 var(--sf-serif); font-style: italic; color: var(--sf-text-body); }
.sf-station-hero-stat { display: flex; align-items: baseline; gap: 10px; margin: 30px 0 0; }
.sf-station-hero-stat .num {
  font: 900 68px/1 var(--sf-sans); letter-spacing: -.04em; color: #fff; font-variant-numeric: tabular-nums;
}
.sf-station-hero-stat .unit { font: 700 14px/1 var(--sf-sans); letter-spacing: .14em; text-transform: uppercase; color: var(--sf-text-label); }
.sf-station-read { margin-top: 10px; font: 400 16px/1.4 var(--sf-serif); font-style: italic; color: #fff; }
.sf-dashed-rule { height: 1px; margin: 26px 0; border-top: 1px dashed var(--sf-dashed); }
.sf-substats { display: grid; grid-template-columns: 1fr 1fr; gap: 22px 16px; }
.sf-substat-label { font: 600 10px/1 var(--sf-sans); letter-spacing: .2em; text-transform: uppercase; color: var(--sf-text-muted); margin-bottom: 6px; }
.sf-substat-val { font: 900 26px/1 var(--sf-sans); letter-spacing: -.03em; color: #fff; font-variant-numeric: tabular-nums; }
.sf-substat-val .unit { font-size: 14px; letter-spacing: .1em; color: var(--sf-text-label); }

.sf-avy-block { margin-top: auto; padding-top: 26px; }
.sf-avy-label { font: 600 10px/1 var(--sf-sans); letter-spacing: .2em; text-transform: uppercase; color: var(--sf-text-muted); margin-bottom: 10px; }
.sf-avy-bar { display: flex; gap: 4px; margin-bottom: 10px; }
.sf-avy-seg { flex: 1; height: 6px; border-radius: 3px; background: var(--sf-track-empty); }
.sf-avy-seg.is-1 { background: var(--naads-1-low); }
.sf-avy-seg.is-2 { background: var(--naads-2-moderate); }
.sf-avy-seg.is-3 { background: var(--naads-3-considerable); }
.sf-avy-seg.is-4 { background: var(--naads-4-high); }
.sf-avy-seg.is-5 { background: var(--naads-5-extreme); border: 1px solid rgba(255,255,255,.3); }
.sf-avy-read { font: 400 15px/1.4 var(--sf-serif); font-style: italic; color: #fff; }
.sf-avy-legend { display: flex; flex-wrap: wrap; gap: 4px 12px; margin-top: 12px; }
.sf-avy-legend-item {
  display: inline-flex; align-items: center; gap: 5px;
  font: 600 9px/1 var(--sf-sans); letter-spacing: .08em; text-transform: uppercase; color: var(--sf-text-muted);
}
.sf-avy-swatch { width: 8px; height: 8px; border-radius: 2px; }
.sf-avy-swatch.is-1 { background: var(--naads-1-low); }
.sf-avy-swatch.is-2 { background: var(--naads-2-moderate); }
.sf-avy-swatch.is-3 { background: var(--naads-3-considerable); }
.sf-avy-swatch.is-4 { background: var(--naads-4-high); }
.sf-avy-swatch.is-5 { background: var(--naads-5-extreme); border: 1px solid rgba(255,255,255,.3); }
.sf-avy-cta { display: inline-block; margin-top: 10px; font: 600 11px/1 var(--sf-sans); letter-spacing: .06em; }

/* ── Featured conditions ─────────────────────────────────── */
.sf-section { padding: 80px 36px; background: var(--sf-page); }
.sf-section .sf-section-eyebrow {
  font: 600 11px/1 var(--sf-sans); letter-spacing: .22em; text-transform: uppercase; color: var(--sf-text-muted);
}
.sf-section h2 { margin: 14px 0 6px; font: 400 40px/1.1 var(--sf-serif); letter-spacing: -.02em; color: #fff; }
.sf-section-sub { margin: 0 0 30px; font: 400 15px/1.5 var(--sf-serif); font-style: italic; color: var(--sf-text-body); }

.sf-featured-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.sf-featured-card {
  position: relative; overflow: hidden;
  padding: 26px 28px; border-radius: 14px; cursor: pointer;
  background: var(--sf-card-raised);
  border: 1px solid var(--sf-border);
  display: grid; grid-template-columns: 1fr auto; gap: 4px 16px;
  transition: transform var(--sf-dur-fast) var(--sf-ease), border-color var(--sf-dur-fast), box-shadow var(--sf-dur-fast);
}
.sf-featured-card:hover {
  transform: translateY(-3px); border-color: rgba(127, 178, 240, .7);
  box-shadow: 0 22px 44px -22px rgba(0, 0, 0, .85);
}
.sf-featured-eyebrow { display: flex; align-items: center; gap: 6px; font: 600 10px/1 var(--sf-sans); letter-spacing: .18em; text-transform: uppercase; color: var(--sf-text-muted); }
.sf-featured-eyebrow-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--sf-blue); }
.sf-featured-name { margin: 6px 0 2px; font: 500 26px/1.1 var(--sf-serif); letter-spacing: -.01em; color: var(--sf-blue-soft); }
.sf-featured-read { font: 400 14px/1.4 var(--sf-serif); font-style: italic; color: var(--sf-text-body); }
.sf-featured-badge {
  display: inline-flex; margin-top: 12px; padding: 3px 9px; border-radius: 999px;
  font: 700 10px/1.6 var(--sf-sans); letter-spacing: .1em; text-transform: uppercase;
}
.sf-featured-badge.is-closed { background: var(--sf-badge-fill); color: var(--sf-text-body); }
.sf-featured-stat { text-align: right; align-self: center; }
.sf-featured-stat .num { font: 500 48px/1 var(--sf-serif); letter-spacing: -.02em; color: #fff; font-variant-numeric: tabular-nums; }
.sf-featured-stat .num.is-empty { color: var(--sf-text-faint); font-size: 32px; }
.sf-featured-stat .unit { margin-top: 4px; font: 600 11px/1 var(--sf-sans); letter-spacing: .14em; text-transform: uppercase; color: var(--sf-text-label); }
.sf-more-note { margin-top: 20px; font: 400 15px/1.5 var(--sf-serif); font-style: italic; color: var(--sf-text-muted); }

/* ── Pursuit filter ───────────────────────────────────────── */
.sf-pursuit-head { margin-top: 56px; display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.sf-pursuit-head h3 { margin: 0; font: 400 28px/1.1 var(--sf-serif); color: #fff; }
.sf-pursuit-head .tag { font: 600 10px/1 var(--sf-sans); letter-spacing: .2em; text-transform: uppercase; color: var(--sf-text-muted); }
.sf-pursuit-grid { margin-top: 20px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.sf-pursuit-tile {
  padding: 22px; border-radius: 14px; border: 1px solid var(--sf-tile-border); background: var(--sf-tile-fill);
  display: flex; flex-direction: column; gap: 14px; cursor: pointer;
  transition: background var(--sf-dur-fast) var(--sf-ease), border-color var(--sf-dur-fast);
}
.sf-pursuit-tile:hover { background: var(--sf-blue-tint); border-color: rgba(127, 178, 240, .7); }
.sf-pursuit-tile svg { stroke: var(--sf-blue-soft); }
.sf-pursuit-tile span { font: 500 18px/1 var(--sf-serif); color: #fff; }

/* ── Footer ───────────────────────────────────────────────── */
.sf-footer {
  padding: 44px 36px; background: var(--sf-footer); border-top: 1px solid var(--sf-border);
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px;
}
.sf-footer-brand { display: flex; align-items: center; gap: 11px; }
.sf-footer-brand span { font: 400 15px/1 var(--sf-serif); color: rgba(255, 255, 255, .92); }
.sf-footer-sources { font: 600 10px/1 var(--sf-sans); letter-spacing: .2em; text-transform: uppercase; color: var(--sf-text-muted); }
.sf-footer-sources a { color: var(--sf-text-muted); }
.sf-footer-sources a:hover { color: var(--sf-blue-soft); }

/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 880px) {
  .sf-nav { padding: 0 24px; }
  .sf-hero { padding: 56px 20px; }
  .sf-hero-card { padding: 40px 28px 32px; }
  .sf-hero h1 { font-size: 44px; }
  .sf-hero-lead { font-size: 17px; }
  .sf-search { width: 100%; }
  .sf-section-alt, .sf-section { padding: 56px 24px; }
  .sf-section-head { flex-direction: column; align-items: flex-start; gap: 12px; }
  .sf-section-caption { max-width: 100%; text-align: left; }
  .sf-browser { flex-direction: column; }
  .sf-map-panel { width: 100%; padding: 24px; }
  .sf-map-frame { width: 100%; height: auto; aspect-ratio: 560 / 412; }
  .sf-featured-grid { grid-template-columns: 1fr; }
  .sf-pursuit-grid { grid-template-columns: repeat(3, 1fr); gap: 10px; }
  .sf-pursuit-tile { padding: 16px; }
  .sf-footer { padding: 32px 24px; }
}
@media (max-width: 560px) {
  .sf-nav-link { display: none; }
  .sf-nav-links { gap: 12px; }
  .sf-hero h1 { font-size: 40px; }
  .sf-popular { justify-content: center; }
  .sf-search { padding: 7px 7px 7px 18px; }
  .sf-search input { font-size: 15px; }
  .sf-search-btn { padding: 0 18px; height: 40px; }
  .sf-substats { grid-template-columns: 1fr 1fr; gap: 18px 14px; }
  .sf-pursuit-grid { grid-template-columns: 1fr 1fr; }
  .sf-pursuit-grid .sf-pursuit-tile:last-child { grid-column: 1 / -1; }
  .sf-featured-card { grid-template-columns: 1fr; }
  .sf-featured-stat { text-align: left; margin-top: 12px; }
}