/* Firn coming-soon page. Values follow design/coming-soon-reference.html. */

@font-face {
  font-family: 'Fraunces';
  src: url('assets/fonts/fraunces.woff2') format('woff2');
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  --frame: #E9E3DA;
  --page: #FBFAF8;
  --ink: #241F1B;
  --ink-muted: #5E564E;
  --ink-faint: #9D9389;
  --frost: rgba(130, 168, 190, 0.45);
  --rule: rgba(60, 40, 20, 0.08);

  --field-bg: #FFFFFF;
  --field-border: rgba(60, 40, 20, 0.14);
  --button-hover: #3A332D;
  --thanks-bg: rgba(251, 250, 248, 0.85);

  /* Window mockup: address bar, Basecamp tiles, highlighted tab */
  --address-bg: rgba(255, 255, 255, 0.55);
  --tile-bg: rgba(255, 255, 255, 0.5);
  --tile-active-bg: rgba(255, 255, 255, 0.78);

  --shadow-page: 0 1px 3px rgba(60, 40, 20, 0.14), 0 6px 20px rgba(60, 40, 20, 0.2);
  --shadow-window: 0 2px 8px rgba(40, 28, 16, 0.14), 0 18px 48px rgba(40, 28, 16, 0.22);
  --shadow-small: 0 1px 2px rgba(60, 40, 20, 0.08);

  --snow-art: url('assets/firn-snow-layers.svg');

  --sans: system-ui, -apple-system, 'Segoe UI', sans-serif;
  --ease: 200ms ease-out;

  color-scheme: light dark;
}

/* Dark mode follows the visitor's system setting, like Firn follows the OS.
   Only colors, shadows and the snow art change; layout stays the same. */
@media (prefers-color-scheme: dark) {
  :root {
    --frame: #3A3734;
    --page: #2B2826;
    --ink: #F5F1EC;
    --ink-muted: #D4CDC5;
    --ink-faint: #958D85;
    --frost: rgba(160, 196, 214, 0.45);
    --rule: rgba(255, 250, 245, 0.08);

    --field-bg: rgba(255, 250, 245, 0.08);
    --field-border: rgba(255, 250, 245, 0.12);
    --button-hover: #E3DDD6;
    --thanks-bg: rgba(43, 40, 38, 0.85);

    --address-bg: rgba(255, 250, 245, 0.08);
    --tile-bg: rgba(255, 250, 245, 0.08);
    --tile-active-bg: rgba(255, 250, 245, 0.14);

    --shadow-page: 0 1px 3px rgba(0, 0, 0, 0.3), 0 6px 22px rgba(0, 0, 0, 0.35);
    --shadow-window: 0 2px 8px rgba(0, 0, 0, 0.3), 0 18px 48px rgba(0, 0, 0, 0.4);
    --shadow-small: 0 1px 2px rgba(0, 0, 0, 0.15);

    --snow-art: url('assets/firn-snow-layers-dark.svg');
  }
}

/* ---------- Base ---------- */

body {
  margin: 0;
  background: var(--frame);
  color: var(--ink);
  font-family: var(--sans);
}

a {
  color: var(--ink);
  transition: color var(--ease);
}
a:hover { color: var(--ink-muted); }

a:focus-visible,
button:focus-visible,
input:focus {
  outline: 3px solid var(--frost);
  outline-offset: 1px;
}

.serif {
  font-family: 'Fraunces', Georgia, serif;
  font-variation-settings: 'SOFT' 100, 'WONK' 0;
  font-optical-sizing: auto;
}

/* ---------- The Firn window: sand frame around a floating page ---------- */

.frame {
  min-height: 100vh;
  box-sizing: border-box;
  padding: 12px;
}

.sheet {
  background: var(--page);
  border-radius: 14px;
  box-shadow: var(--shadow-page);
  overflow: hidden;
}

/* ---------- Header ---------- */

.site-header {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}

.logo-link { display: flex; }
.logo-link img { height: 34px; width: auto; display: block; }

.header-nav {
  display: flex;
  gap: 24px;
  font-size: 15px;
  flex-wrap: wrap;
}
.header-nav a { text-decoration: none; }

/* ---------- Hero ---------- */

.hero {
  /* The snow art spans the full width at its natural proportions. On narrow
     screens it stays at least 800px wide (trimmed at the sides) so it
     doesn't shrink into a thin strip.
     Bottom padding grows with the art's width (1920×384, about 17.3% of its
     width from the top crystal to the bottom), so the faint crystals always
     sit below the text instead of on it. */
  --snow-width: max(100vw - 24px, 800px);
  padding: 72px 32px max(220px, calc(var(--snow-width) * 0.173 + 28px));
  background-image: var(--snow-art);
  background-size: var(--snow-width) auto;
  background-repeat: no-repeat;
  background-position: center bottom;
}

.hero-inner {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
}

.eyebrow {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.hero h1 {
  margin: 0;
  font-size: clamp(44px, 7vw, 76px);
  line-height: 1.04;
  font-weight: 360;
  letter-spacing: -0.015em;
}

.lede {
  margin: 0;
  max-width: 600px;
  font-size: 19px;
  line-height: 1.55;
  color: var(--ink-muted);
}

/* ---------- Sign-up form ---------- */

.signup {
  margin-top: 8px;
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
}

.signup label {
  font-size: 14px;
  color: var(--ink-muted);
}

.signup-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.signup input {
  flex: 1 1 240px;
  min-width: 0;
  height: 48px;
  box-sizing: border-box;
  padding: 0 16px;
  border: 1px solid var(--field-border);
  border-radius: 10px;
  background: var(--field-bg);
  font: inherit;
  font-size: 16px;
  color: var(--ink);
  transition: outline-color var(--ease);
}
.signup input::placeholder { color: var(--ink-faint); }

.signup button {
  flex: 0 0 auto;
  height: 48px;
  padding: 0 22px;
  border: 0;
  border-radius: 10px;
  background: var(--ink);
  color: var(--page);
  font: inherit;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--ease);
}
.signup button:hover { background: var(--button-hover); }

.signup-note {
  margin: 0;
  font-size: 13px;
  color: var(--ink-muted);
}

.signup-error {
  margin: 0;
  font-size: 14px;
  color: var(--ink);
}

.signup button:disabled { cursor: progress; }

/* Spam trap: off-screen for people, still filled in by most bots. */
.trap {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.thanks {
  margin-top: 8px;
  padding: 16px 22px;
  border-radius: 14px;
  background: var(--thanks-bg);
  font-size: 16px;
  color: var(--ink);
}

/* ---------- Window mockup ----------
   Drawn at 1060px wide. Every size is a multiple of --u, which is 1px when
   there's room and shrinks on narrow screens, so the whole picture scales
   down together instead of squashing the sidebar. */

.showcase {
  padding: 0 32px;
  /* Overlaps the snow by 150px on desktop, less as the mockup shrinks. */
  margin-top: max(-150px, (100vw - 88px) * -0.1415);
  container-type: inline-size;
}

.window {
  --u: min(1px, 100cqw / 1060);
  width: calc(1060 * var(--u));
  box-sizing: border-box;
  margin: 0 auto;
  border-radius: calc(14 * var(--u));
  background: var(--frame);
  padding: calc(10 * var(--u));
  box-shadow: var(--shadow-window);
}

.window-body {
  display: flex;
  gap: calc(10 * var(--u));
  height: calc(520 * var(--u));
}

.sidebar {
  flex: 0 0 calc(230 * var(--u));
  display: flex;
  flex-direction: column;
  gap: calc(14 * var(--u));
  padding: calc(8 * var(--u)) calc(6 * var(--u));
}

.address {
  height: calc(36 * var(--u));
  border-radius: calc(10 * var(--u));
  background: var(--address-bg);
  display: flex;
  align-items: center;
  padding: 0 calc(12 * var(--u));
  font-size: calc(13 * var(--u));
  color: var(--ink-faint);
  white-space: nowrap;
}

.basecamp {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: calc(6 * var(--u));
}
.basecamp div {
  height: calc(40 * var(--u));
  border-radius: calc(10 * var(--u));
  background: var(--tile-bg);
}
.basecamp .active { background: var(--tile-active-bg); }

.space-label {
  font-size: calc(12 * var(--u));
  color: var(--ink-muted);
  padding: calc(6 * var(--u)) calc(6 * var(--u)) 0;
}

.tabs {
  display: flex;
  flex-direction: column;
  gap: calc(4 * var(--u));
}

.tab {
  height: calc(36 * var(--u));
  border-radius: calc(10 * var(--u));
  display: flex;
  align-items: center;
  gap: calc(10 * var(--u));
  padding: 0 calc(12 * var(--u));
  font-size: calc(13 * var(--u));
  color: var(--ink-muted);
  white-space: nowrap;
}
.tab.active {
  background: var(--tile-active-bg);
  box-shadow: var(--shadow-small);
  color: var(--ink);
}
.tab span {
  width: calc(14 * var(--u));
  height: calc(14 * var(--u));
  border-radius: calc(4 * var(--u));
}

.space-dots {
  margin-top: auto;
  display: flex;
  gap: calc(10 * var(--u));
  padding: calc(6 * var(--u));
}
.space-dots span {
  width: calc(10 * var(--u));
  height: calc(10 * var(--u));
  border-radius: 999px;
}

.window-page {
  flex: 1 1 auto;
  min-width: 0;
  border-radius: calc(12 * var(--u));
  background: var(--page);
  box-shadow: var(--shadow-page);
  display: flex;
  align-items: center;
  justify-content: center;
}
.window-page p {
  margin: 0;
  font-size: calc(14 * var(--u));
  color: var(--ink-faint);
}

/* ---------- Features ---------- */

.features,
.principles {
  max-width: 1040px;
  margin: 0 auto;
}

.features { padding: 120px 32px 40px; }
.principles { padding: 72px 32px 112px; }

.features h2,
.principles h2 {
  margin: 0 0 48px;
  font-size: 40px;
  line-height: 1.15;
  font-weight: 380;
  text-align: center;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 400px), 1fr));
  gap: 16px;
}

.card {
  background: var(--frame);
  border-radius: 14px;
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.card h3 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}

.card p,
.principle p {
  margin: 0;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-muted);
}

/* ---------- Principles ---------- */

.principle-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 40px 32px;
}

.principle {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.principle h3 {
  margin: 0;
  font-size: 24px;
  font-weight: 400;
}

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

.site-footer { border-top: 1px solid var(--rule); }

.footer-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 32px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  color: var(--ink-muted);
}
.footer-inner p { margin: 0; }

.footer-nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}
.footer-nav a { color: var(--ink-muted); }