/* Colonnade's site: dark and glassy like the app's icon and overlays, with a
   light version for light mode. No web fonts: the Mac's own. */

:root {
  --bg: #0b1020;
  --bg-2: #141c33;
  --text: #e9edf6;
  --muted: #9aa6c0;
  --faint: #6c7894;
  --accent: #3d7bff;
  --accent-2: #6aa4ff;
  --glass: rgba(255, 255, 255, 0.055);
  --glass-edge: rgba(255, 255, 255, 0.13);
  --glass-lit: rgba(255, 255, 255, 0.28);
  --screen: #0e1426;
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  --radius: 22px;
  --page: min(1080px, calc(100vw - 32px));
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f4f6fb;
    --bg-2: #e6ebf5;
    --text: #141a2b;
    --muted: #4f5a73;
    --faint: #7a849b;
    --accent: #2f66f0;
    --accent-2: #4f8bff;
    --glass: rgba(255, 255, 255, 0.7);
    --glass-edge: rgba(20, 30, 60, 0.1);
    --glass-lit: rgba(255, 255, 255, 0.95);
    --screen: #dfe5f1;
    --shadow: 0 30px 70px rgba(30, 45, 90, 0.18);
    color-scheme: light;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background:
    radial-gradient(1200px 600px at 50% -10%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 70%),
    linear-gradient(var(--bg), var(--bg-2) 60%, var(--bg));
  background-attachment: fixed;
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }
@media (prefers-color-scheme: light) { a { color: var(--accent); } }

h1, h2, h3 {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue", sans-serif;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0;
}
h2 { font-size: clamp(28px, 4.2vw, 40px); text-align: center; margin-bottom: 36px; }
h3 { font-size: 19px; margin-bottom: 8px; }
p { margin: 0; }

.fine { color: var(--faint); font-size: 14px; }

kbd {
  display: inline-block;
  min-width: 1.6em;
  padding: 0 0.45em;
  border: 1px solid var(--glass-edge);
  border-bottom-width: 2px;
  border-radius: 6px;
  background: var(--glass);
  font: 600 0.85em/1.6 -apple-system, BlinkMacSystemFont, sans-serif;
  text-align: center;
  white-space: nowrap;
}

/* Hero */

.hero {
  width: var(--page);
  margin: 0 auto;
  padding: 72px 0 40px;
  text-align: center;
}
.hero-icon {
  width: 148px;
  height: 148px;
  filter: drop-shadow(0 18px 40px rgba(61, 123, 255, 0.35));
}
.hero h1 { font-size: clamp(44px, 7vw, 72px); margin-top: 14px; }
.tagline { font-size: clamp(20px, 2.6vw, 26px); color: var(--text); margin-top: 6px; font-weight: 500; }
.lede { max-width: 620px; margin: 18px auto 0; color: var(--muted); font-size: 18px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 30px; }
.hero .fine { margin-top: 16px; }

.button {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid var(--glass-edge);
  background: var(--glass);
  color: var(--text);
  font-weight: 600;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.button:hover { text-decoration: none; transform: translateY(-1px); }
.button.primary {
  background: linear-gradient(180deg, var(--accent-2), var(--accent));
  border-color: rgba(255, 255, 255, 0.25);
  color: #fff;
  box-shadow: 0 10px 30px color-mix(in srgb, var(--accent) 40%, transparent),
              inset 0 1px 0 rgba(255, 255, 255, 0.35);
}

/* The demo: a strip of windows that behaves like Colonnade */

.demo { text-align: center; }
.demo h2 { margin-bottom: 14px; }
.caption {
  min-height: 3.2em;
  max-width: 640px;
  margin: 0 auto 18px;
  color: var(--muted);
  font-size: 17px;
}
.screen {
  position: relative;
  height: clamp(250px, 36vw, 400px);
  border-radius: var(--radius);
  background: var(--screen);
  border: 1px solid var(--glass-edge);
  box-shadow: var(--shadow), inset 0 1px 0 var(--glass-lit);
  overflow: hidden;
  touch-action: pan-y;
  cursor: grab;
  user-select: none;
  -webkit-user-select: none;
  text-align: left;
}
.screen:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 4px; }
.screen.dragging { cursor: grabbing; }
.strip {
  position: absolute;
  inset: 7% 0 21% 0;
}
.win {
  position: absolute;
  top: 0;
  left: 0;
  border-radius: 12px;
  background: var(--glass);
  border: 1px solid var(--glass-edge);
  padding: 34px 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 9px;
  overflow: hidden;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1), width 0.5s cubic-bezier(0.2, 0.8, 0.2, 1),
              height 0.5s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.3s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.strip.instant .win { transition: opacity 0.3s ease, border-color 0.2s ease, box-shadow 0.2s ease; }
/* New windows fade in where they open; closed ones fade out. */
.win { animation: appear 0.3s ease both; }
.win.leaving { opacity: 0; }
@keyframes appear { from { opacity: 0; } }
.win.focused {
  border: 2px solid var(--accent-2);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 35%, transparent),
              0 0 26px color-mix(in srgb, var(--accent) 50%, transparent);
}
.win header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 28px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 12px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
}
.win header i {
  flex: 0 0 8px;
  height: 8px;
  border-radius: 50%;
  background: #ff5f57;
  box-shadow: 13px 0 0 #febc2e, 26px 0 0 #28c840;
  margin-right: 28px;
}
.win b {
  display: block;
  flex: 0 0 9px;
  border-radius: 5px;
  background: var(--tint);
  opacity: 0.55;
}
.win b.short { width: 60%; }
.win em {
  flex: 1;
  margin-top: 4px;
  border-radius: 8px;
  background: var(--tint);
  opacity: 0.13;
}
.win.compact b, .win.compact em { display: none; }

.timeline {
  position: absolute;
  left: 50%;
  bottom: 5.5%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  padding: 7px 9px;
  border-radius: 12px;
  background: var(--glass);
  border: 1px solid var(--glass-edge);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.timeline span {
  position: relative;
  width: clamp(16px, 2.2vw, 24px);
  height: clamp(16px, 2.2vw, 24px);
  border-radius: 6px;
  background: color-mix(in srgb, var(--tint) 30%, transparent);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}
.timeline span.shown { background: color-mix(in srgb, var(--tint) 65%, transparent); }
.timeline span.focused { box-shadow: 0 0 0 2px var(--accent-2), 0 0 12px color-mix(in srgb, var(--accent) 60%, transparent); }
.timeline span[data-stack]::after {
  content: attr(data-stack);
  position: absolute;
  top: -6px;
  right: -6px;
  min-width: 14px;
  height: 14px;
  border-radius: 7px;
  background: var(--accent);
  color: #fff;
  font: 700 9px/14px -apple-system, sans-serif;
  text-align: center;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin: 22px auto 12px;
  max-width: 860px;
}
.controls button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px 8px 8px;
  border-radius: 999px;
  border: 1px solid var(--glass-edge);
  background: var(--glass);
  color: var(--text);
  font: 600 14px -apple-system, BlinkMacSystemFont, sans-serif;
  cursor: pointer;
  transition: transform 0.12s ease, border-color 0.12s ease;
}
.controls button:hover { border-color: var(--accent-2); }
.controls button:active { transform: scale(0.97); }
.controls button:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 2px; }
.controls kbd { font-size: 12px; }
.demo .hint { max-width: 520px; margin: 0 auto; }

@media (prefers-reduced-motion: reduce) {
  .win, .timeline span, .controls button { transition: none !important; animation: none !important; }
}

/* Light that follows the pointer (effects.js sets --x and --y). The glow
   sits on the border only: the mask cuts out everything inside it. */

.card, .screen, .button, .controls button { position: relative; }
.card::before, .screen::before, .button::before, .controls button::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1.5px;
  background: radial-gradient(220px circle at var(--x, -1000px) var(--y, -1000px),
              color-mix(in srgb, var(--accent-2) 80%, white), transparent 70%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0);
  pointer-events: none;
  z-index: 2;
}
.screen::before { padding: 2px; background: radial-gradient(320px circle at var(--x, -1000px) var(--y, -1000px),
                  color-mix(in srgb, var(--accent-2) 70%, white), transparent 70%); }
/* A faint wash of the same light inside cards. */
.card::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(360px circle at var(--x, -1000px) var(--y, -1000px),
              color-mix(in srgb, var(--accent) 7%, transparent), transparent 70%);
  pointer-events: none;
}

/* Blue light doesn't show on the blue Download button: it gets white light
   on its edge and a soft spot of it inside, under the label. */
.button.primary::before {
  background: radial-gradient(160px circle at var(--x, -1000px) var(--y, -1000px),
              rgba(255, 255, 255, 0.95), transparent 70%);
}
.button.primary::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(110px circle at var(--x, -1000px) var(--y, -1000px),
              rgba(255, 255, 255, 0.22), transparent 70%);
  pointer-events: none;
  z-index: -1;
}
.button.primary:hover {
  box-shadow: 0 12px 36px color-mix(in srgb, var(--accent) 55%, transparent),
              inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

/* A demo button presses when its key is used. */
.controls button.pressed { transform: scale(0.96); border-color: var(--accent-2); }

/* Sections */

main { width: var(--page); margin: 0 auto; }
section { margin-bottom: 110px; }

.three {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.three p { color: var(--muted); }
.point { margin: 0; }

/* Small pictures for "Windows in a row". Still, until hovered: then each
   shows its idea once. */
.mini {
  position: relative;
  height: 128px;
  margin-bottom: 20px;
  border-radius: 16px;
  background: var(--screen);
  border: 1px solid var(--glass-edge);
  box-shadow: inset 0 1px 0 var(--glass-lit);
  overflow: hidden;
}
.mini .row {
  position: absolute;
  inset: 16px auto 16px 16px;
  display: flex;
  gap: 8px;
}
.mini .row span {
  flex: 0 0 62px;
  border-radius: 9px;
  background: var(--glass);
  border: 1px solid var(--glass-edge);
  transition: border-color 0.4s ease, box-shadow 0.4s ease;
}
.mini .row span.focus {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 0.5px var(--accent-2), 0 0 14px color-mix(in srgb, var(--accent) 40%, transparent);
}

/* A new window, beside the focused one; the next one moves along. */
.mini.open .row span.new {
  border: 1.5px dashed var(--accent-2);
  transition: none;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
}
.point:hover .mini.open .row span.new { animation: opens 0.7s cubic-bezier(0.2, 0.8, 0.2, 1); }
@keyframes opens {
  from { flex-basis: 0; opacity: 0; margin-right: -8px; }
}

/* The strip carries on past the screen, both ways. */
.mini.runs .row { left: -40px; transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1); }
.mini.runs .frame {
  position: absolute;
  inset: 8px 26%;
  border-radius: 12px;
  border: 1.5px solid color-mix(in srgb, var(--text) 45%, transparent);
  box-shadow: 0 0 0 999px color-mix(in srgb, var(--screen) 62%, transparent);
}
/* Focus two columns on: the strip glides until that one is on screen. */
.point:hover .mini.runs .row { transform: translateX(-70px); }
.point:hover .mini.runs .row span.focus { border-color: var(--glass-edge); box-shadow: none; }
.point:hover .mini.runs .row span:nth-child(5) {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 0.5px var(--accent-2), 0 0 14px color-mix(in srgb, var(--accent) 40%, transparent);
}

/* Focus moves along; the timeline follows. */
.mini.flow .row { bottom: 44px; }
.mini.flow .ring {
  position: absolute;
  top: 16px;
  bottom: 44px;
  left: 86px;
  width: 62px;
  border-radius: 9px;
  border: 1.5px solid var(--accent-2);
  box-shadow: 0 0 14px color-mix(in srgb, var(--accent) 40%, transparent);
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.mini.flow .dots {
  position: absolute;
  left: 50%;
  bottom: 12px;
  transform: translateX(-50%);
  display: flex;
  gap: 5px;
  padding: 5px 7px;
  border-radius: 8px;
  background: var(--glass);
  border: 1px solid var(--glass-edge);
}
.mini.flow .dots i {
  width: 11px;
  height: 11px;
  border-radius: 3px;
  background: var(--glass-edge);
  transition: background 0.3s ease;
}
.mini.flow .dots i.lit { background: var(--accent-2); }
.point:hover .mini.flow .ring { transform: translateX(70px); }
.point:hover .mini.flow .dots i.lit { background: var(--glass-edge); }
.point:hover .mini.flow .dots i:nth-child(3) { background: var(--accent-2); }

@media (prefers-reduced-motion: reduce) {
  .mini .row, .mini .row span, .mini .ring, .mini .dots i { transition: none !important; animation: none !important; }
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 900px) {
  .features { grid-template-columns: repeat(2, 1fr); }
  /* An odd card out spans the last row. */
  .features .card:last-child:nth-child(odd) { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .features { grid-template-columns: 1fr; }
}
.card {
  padding: 24px;
  border-radius: var(--radius);
  background: var(--glass);
  border: 1px solid var(--glass-edge);
  box-shadow: inset 0 1px 0 var(--glass-lit);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.card p { color: var(--muted); font-size: 16px; }

.sub { max-width: 600px; margin: -22px auto 30px; color: var(--muted); text-align: center; }

.shortcuts dl {
  max-width: 720px;
  margin: 0 auto;
  display: grid;
  gap: 2px;
}
.shortcuts dl > div {
  display: grid;
  grid-template-columns: 220px 1fr;
  align-items: center;
  gap: 16px;
  padding: 12px 18px;
  border-radius: 12px;
}
.shortcuts dl > div:nth-child(odd) { background: var(--glass); }
.shortcuts dl > div { transition: background 0.15s ease; }
.shortcuts dl > div:hover, .shortcuts dl > div:nth-child(odd):hover {
  background: color-mix(in srgb, var(--accent) 10%, var(--glass));
}
.shortcuts dt { white-space: nowrap; }
.shortcuts dd { margin: 0; color: var(--muted); }

footer {
  width: var(--page);
  margin: 0 auto;
  padding: 30px 0 50px;
  border-top: 1px solid var(--glass-edge);
  text-align: center;
  color: var(--muted);
  display: grid;
  gap: 6px;
}

@media (max-width: 760px) {
  .hero { padding-top: 48px; }
  .three { grid-template-columns: 1fr; gap: 24px; }
  .shortcuts dl > div { grid-template-columns: 1fr; gap: 4px; }
  section { margin-bottom: 80px; }
}