/* Unictrl product page. One stylesheet, CSS variables, mobile first.
   The page is a desk that spans two computers: the Mac side (warm paper) on the left, the Windows side
   (deep pine) on the right, joined by a glowing seam that runs the full height of the page. */

@font-face {
  font-family: "Fraunces";
  src: url("/fonts/fraunces-latin.woff2") format("woff2");
  font-weight: 400 800;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215;
}

:root {
  /* Mac side */
  --paper: #f3ece2;
  --paper-2: #ebe1d3;
  --ink: #1d2623;
  --ink-muted: #5a6662;
  --ink-line: rgba(29, 38, 35, 0.14);
  /* Windows side */
  --pine: #16352f;
  --pine-2: #1d453d;
  --on-pine: #edf5f1;
  --on-pine-muted: rgba(237, 245, 241, 0.7);
  --pine-line: rgba(237, 245, 241, 0.16);
  /* Brand */
  --brand: #285853;
  --brand-2: #488f7e;
  --glow: #7fd1b4;
  /* Type */
  --display: "Fraunces", "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", Georgia, serif;
  --text: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "PingFang TC", "Hiragino Sans GB", "Microsoft YaHei", "Microsoft JhengHei", "Noto Sans CJK SC", sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  /* Scale */
  --step--1: clamp(0.84rem, 0.8rem + 0.15vw, 0.92rem);
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.12rem);
  --step-1: clamp(1.2rem, 1.1rem + 0.45vw, 1.45rem);
  --step-2: clamp(1.6rem, 1.3rem + 1.3vw, 2.4rem);
  --step-3: clamp(2.4rem, 1.7rem + 3.2vw, 4.6rem);
  --gutter: clamp(16px, 4vw, 72px);
  --radius: 14px;
  --header-h: 64px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #1a1815;
    --paper-2: #221f1b;
    --ink: #efe7db;
    --ink-muted: #a69e92;
    --ink-line: rgba(239, 231, 219, 0.14);
    --pine: #0c1f1b;
    --pine-2: #122d27;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #1a1815;
  --paper-2: #221f1b;
  --ink: #efe7db;
  --ink-muted: #a69e92;
  --ink-line: rgba(239, 231, 219, 0.14);
  --pine: #0c1f1b;
  --pine-2: #122d27;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 12px); }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 var(--step-0)/1.65 var(--text);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, video, svg { display: block; max-width: 100%; }
a { color: inherit; }
h1, h2, h3 { margin: 0; font-weight: 600; }
p { margin: 0; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 50; background: var(--glow); color: #06221c; padding: 8px 14px; border-radius: 8px; }
.skip:focus { left: 12px; }
:focus-visible { outline: 2px solid var(--glow); outline-offset: 3px; border-radius: 4px; }

/* ---------- Header ---------- */
.top {
  position: sticky; top: 0; z-index: 20;
  height: var(--header-h);
  display: flex; align-items: center; gap: 18px;
  padding: 0 var(--gutter);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  -webkit-backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--ink-line);
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font: 600 1.3rem/1 var(--display); letter-spacing: -0.01em; }
.brand img { border-radius: 8px; }
.nav { display: none; }
.prefs { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.pick select {
  appearance: none; -webkit-appearance: none;
  font: 500 var(--step--1)/1 var(--text);
  color: inherit; background: transparent;
  border: 1px solid var(--ink-line); border-radius: 999px;
  padding: 8px 12px; cursor: pointer;
}
.pick select:hover { border-color: var(--ink-muted); }
.gh { display: none; text-decoration: none; font: 600 var(--step--1)/1 var(--text); padding: 9px 14px; border-radius: 999px; background: var(--ink); color: var(--paper); }

/* ---------- Split sections (mobile: stacked, seam horizontal) ---------- */
.split { position: relative; display: grid; grid-template-columns: minmax(0, 1fr); }
.side { padding: clamp(40px, 7vw, 96px) var(--gutter); }
.side.mac { background: var(--paper); color: var(--ink); }
.side.pc {
  background: radial-gradient(120% 90% at 100% 0%, var(--pine-2) 0%, var(--pine) 60%);
  color: var(--on-pine);
  position: relative;
}
.side.pc::before { /* the seam, horizontal on small screens */
  content: ""; position: absolute; left: 0; right: 0; top: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--glow) 20%, var(--glow) 80%, transparent);
  box-shadow: 0 0 18px 2px color-mix(in srgb, var(--glow) 55%, transparent);
  opacity: 0.85;
}

.kicker { font: 600 var(--step--1)/1 var(--text); letter-spacing: 0.14em; text-transform: uppercase; color: var(--brand-2); margin-bottom: 18px; }
:root[data-theme="dark"] .kicker { color: var(--glow); }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .kicker { color: var(--glow); } }
h2 { font: 600 var(--step-2)/1.12 var(--display); letter-spacing: -0.015em; margin-bottom: 20px; max-width: 18ch; }
.side.mac p { color: var(--ink-muted); max-width: 56ch; }
/* Chinese glyphs are about twice as wide as a "ch": measure headings in em instead, and keep lines balanced. */
:lang(zh) h2 { max-width: 15em; }
:lang(zh) .side.mac p { max-width: 34em; }
h1, h2 { text-wrap: balance; }

/* ---------- Hero ---------- */
.hero .side.mac { padding-top: clamp(48px, 9vw, 120px); }
.eyebrow { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 28px; font: 600 var(--step--1)/1 var(--text); }
.tag { padding: 6px 10px; border-radius: 6px; background: var(--paper-2); border: 1px solid var(--ink-line); color: var(--ink); }
.tag.pc { background: var(--pine); color: var(--on-pine); border-color: transparent; }
.arrows { color: var(--brand-2); font-size: 1.1em; }
.free { margin-left: 4px; color: var(--brand-2); }
h1 { font: 600 var(--step-3)/1.02 var(--display); letter-spacing: -0.025em; margin-bottom: 28px; }
h1 span { display: block; }
h1 em { display: block; font-style: italic; font-weight: 500; color: var(--brand-2); }
.lede { font-size: var(--step-1); line-height: 1.5; color: var(--ink-muted); max-width: 34ch; margin-bottom: 34px; }
.ctas { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 48px; padding: 0 22px; border-radius: 999px;
  font: 600 var(--step-0)/1 var(--text); text-decoration: none;
  transition: transform 0.25s ease-out, background-color 0.25s ease-out, border-color 0.25s ease-out;
}
.btn:hover { transform: translateY(-2px); }
.btn.solid { background: var(--brand); color: #fff; }
.btn.solid:hover { background: var(--brand-2); }
.btn.line { border: 1.5px solid var(--ink-line); color: var(--ink); }
.btn.line:hover { border-color: var(--ink); }
.btn.inverse.solid { background: var(--glow); color: #06221c; }
.btn.inverse.line { border-color: var(--pine-line); color: var(--on-pine); }
.btn.inverse.line:hover { border-color: var(--on-pine); }
.specs { margin-top: 26px; font: 500 var(--step--1)/1 var(--mono); color: var(--ink-muted); letter-spacing: 0.02em; }

.screen { margin: 0; }
.bezel {
  background: #0b0d0e; padding: clamp(6px, 0.9vw, 12px); border-radius: calc(var(--radius) + 4px);
  box-shadow: 0 40px 80px -30px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(255, 255, 255, 0.06);
}
.bezel video { width: 100%; height: auto; aspect-ratio: 16 / 9; border-radius: var(--radius); background: #0b0d0e; }
figcaption { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 18px; }
.cap-label { font: 600 var(--step--1)/1 var(--text); letter-spacing: 0.14em; text-transform: uppercase; color: var(--on-pine-muted); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chips button {
  font: 500 var(--step--1)/1 var(--text); color: var(--on-pine);
  background: transparent; border: 1px solid var(--pine-line); border-radius: 999px;
  padding: 9px 14px; cursor: pointer; transition: background-color 0.2s ease-out, border-color 0.2s ease-out;
}
.chips button:hover { border-color: var(--on-pine-muted); }
.chips button[aria-pressed="true"] { background: var(--glow); border-color: var(--glow); color: #06221c; }

/* The pointer crossing the seam: a Mac arrow that becomes a Windows arrow at the edge. */
.crossing { position: absolute; pointer-events: none; z-index: 3; left: 50%; top: calc(var(--cross-y, 52%)); width: 0; height: 0; display: none; }
.cur { position: absolute; width: 26px; height: 39px; max-width: none; left: -13px; top: -8px; }
.cur path { stroke-width: 1.6; stroke-linejoin: round; }
.mac-cur path { fill: #111; stroke: #fff; }
.pc-cur path { fill: #fff; stroke: #111; }

/* ---------- How it works ---------- */
.flow { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; max-width: 520px; }
.flow li { position: relative; padding: 18px 0 18px 46px; border-left: 2px solid var(--pine-line); margin-left: 10px; }
.flow li::before { content: ""; position: absolute; left: -9px; top: 24px; width: 16px; height: 16px; border-radius: 50%; background: var(--pine); border: 2px solid var(--glow); }
.flow li:last-child { border-left-color: transparent; }
.flow li.wire { border-left-style: dashed; border-left-color: var(--glow); }
.flow li.wire::before { background: var(--glow); }
.flow b { display: block; font: 600 var(--step-1)/1.2 var(--display); }
.flow span { color: var(--on-pine-muted); font-size: var(--step--1); }

/* ---------- Features ---------- */
.feature-groups { display: grid; gap: 34px; }
.feature-groups h3 { font: 600 var(--step-1)/1.2 var(--display); margin-bottom: 12px; color: var(--glow); }
.feature-groups ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.feature-groups li { position: relative; padding-left: 22px; color: var(--on-pine); }
.feature-groups li::before { content: ""; position: absolute; left: 0; top: 0.72em; width: 10px; height: 2px; background: var(--glow); }

/* ---------- Setup ---------- */
.steps { list-style: none; margin: 0; padding: 0; counter-reset: s; display: grid; gap: 26px; max-width: 560px; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 64px 1fr; column-gap: 18px; align-items: baseline; }
.steps li::before { content: counter(s, decimal-leading-zero); grid-row: span 2; font: 500 2.4rem/1 var(--display); color: var(--glow); font-style: italic; }
.steps h3 { font: 600 var(--step-1)/1.25 var(--text); }
.steps p { color: var(--on-pine-muted); }

/* ---------- Security ---------- */
.checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 18px; max-width: 600px; }
.checks li { padding: 18px 20px; border: 1px solid var(--pine-line); border-radius: var(--radius); color: var(--on-pine-muted); }
.checks b { color: var(--on-pine); }

/* ---------- Open source ---------- */
.code { font: 500 var(--step--1)/1.5 var(--mono); background: rgba(0, 0, 0, 0.28); border: 1px solid var(--pine-line); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 24px; overflow-x: auto; }
.code code { white-space: nowrap; color: var(--glow); }
.note { margin-top: 22px; color: var(--on-pine-muted); }
.note a { color: var(--on-pine); }

/* ---------- FAQ ---------- */
.faq { display: grid; max-width: 640px; }
.faq details { border-top: 1px solid var(--pine-line); padding: 18px 0; }
.faq details:last-child { border-bottom: 1px solid var(--pine-line); }
.faq summary { cursor: pointer; list-style: none; font: 600 var(--step-1)/1.3 var(--text); display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 400 1.6rem/1 var(--display); color: var(--glow); transition: transform 0.25s ease-out; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq p { margin-top: 12px; color: var(--on-pine-muted); }
.faq a { color: var(--on-pine); }

/* ---------- Footer ---------- */
.foot { display: grid; gap: 14px; padding: 44px var(--gutter) 56px; background: #0a1513; color: rgba(237, 245, 241, 0.72); border-top: 2px solid var(--glow); }
.foot .brand { color: #edf5f1; }
.foot p:first-of-type { font: italic 500 var(--step-1)/1.3 var(--display); color: #edf5f1; }
.foot nav { display: flex; flex-wrap: wrap; gap: 18px; }
.foot nav a { text-decoration: none; }
.foot nav a:hover { text-decoration: underline; }
.legal { font-size: var(--step--1); }

/* ---------- Large screens: the desk splits left and right, the seam is vertical ---------- */
@media (min-width: 900px) {
  body { background: linear-gradient(90deg, var(--paper) 50%, var(--pine) 50%); }

  .gh { display: inline-flex; background: var(--glow); color: #06221c; }
  .top {
    background: linear-gradient(90deg, color-mix(in srgb, var(--paper) 90%, transparent) 50%, color-mix(in srgb, var(--pine) 92%, transparent) 50%);
    border-bottom-color: transparent;
    box-shadow: inset 0 -1px 0 var(--ink-line);
  }
  .prefs { color: var(--on-pine); }
  .prefs .pick select { border-color: var(--pine-line); }
  .prefs .pick select:hover { border-color: var(--on-pine-muted); }
  .prefs .pick option { color: #1d2623; }
  .split { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  main { position: relative; }
  main::after { /* one seam down the whole desk */
    content: ""; position: absolute; top: 0; bottom: 0; left: 50%; width: 3px; margin-left: -1.5px; z-index: 2;
    background: linear-gradient(180deg, var(--glow), color-mix(in srgb, var(--glow) 70%, transparent));
    box-shadow: 0 0 24px 4px color-mix(in srgb, var(--glow) 45%, transparent);
    pointer-events: none;
  }
  .crossing::before { /* the flash where the pointer meets the edge */
    content: ""; position: absolute; left: -60px; top: -90px; width: 120px; height: 180px;
    background: radial-gradient(closest-side, color-mix(in srgb, var(--glow) 85%, transparent), transparent);
    opacity: 0;
  }
  .side.pc::before { display: none; }
  /* The Mac side's heading stays in view while the longer Windows side scrolls past. */
  .split:not(.hero) .side.mac { align-self: start; position: sticky; top: var(--header-h); }
  .side { padding: clamp(72px, 8vw, 128px) clamp(40px, 5vw, 96px); }
  .side.mac { padding-left: var(--gutter); }
  .side.pc { padding-right: var(--gutter); background: transparent; }
  .split .side.pc { background: radial-gradient(90% 70% at 100% 0%, var(--pine-2) 0%, transparent 70%); }
  .hero { min-height: calc(100svh - var(--header-h)); align-items: center; }
  .hero .side { padding-top: clamp(56px, 6vw, 96px); padding-bottom: clamp(56px, 6vw, 96px); }
  .crossing { display: block; --cross-y: 90%; }
  .feature-groups { grid-template-columns: 1fr 1fr; gap: 44px 40px; }
  .foot { grid-template-columns: auto 1fr auto; align-items: center; column-gap: 32px; }
  .foot .legal { grid-column: 1 / -1; }
}

/* The section links fit on the Mac half only from 1280 px */
@media (min-width: 1280px) {
  .nav { display: flex; gap: 22px; margin-left: 28px; }
  .nav a { text-decoration: none; font: 500 var(--step--1)/1 var(--text); color: var(--ink-muted); }
  .nav a:hover { color: var(--ink); }
}

/* Wide screens: keep reading measure, give the video room */
@media (min-width: 1440px) {
  .hero .side.pc { padding-left: 6vw; }
  .feature-groups { gap: 52px 56px; }
}

/* ---------- Motion ---------- */
@media (prefers-reduced-motion: no-preference) {
  .crossing .cur { animation: cross 4.8s cubic-bezier(0.45, 0, 0.2, 1) infinite; }
  .crossing .mac-cur { animation-name: cross, mac-vis; }
  .crossing .pc-cur { animation-name: cross, pc-vis; }
  .crossing::before { animation: flash 4.8s cubic-bezier(0.45, 0, 0.2, 1) infinite; }
  .hero h1, .hero .lede, .hero .ctas, .hero .eyebrow, .hero .specs, .hero .screen { animation: rise 0.7s ease-out both; }
  .hero .eyebrow { animation-delay: 0.05s; }
  .hero h1 { animation-delay: 0.12s; }
  .hero .lede { animation-delay: 0.22s; }
  .hero .ctas { animation-delay: 0.3s; }
  .hero .specs { animation-delay: 0.36s; }
  .hero .screen { animation-delay: 0.2s; }
}
@keyframes cross {
  0%, 12% { transform: translate(-150px, 30px); opacity: 0; }
  20% { opacity: 1; }
  50% { transform: translate(0, 0); }
  80% { transform: translate(150px, -24px); opacity: 1; }
  92%, 100% { transform: translate(150px, -24px); opacity: 0; }
}
@keyframes mac-vis { 0%, 49.9% { visibility: visible; } 50%, 100% { visibility: hidden; } }
@keyframes pc-vis { 0%, 49.9% { visibility: hidden; } 50%, 100% { visibility: visible; } }
@keyframes flash {
  0%, 42% { opacity: 0; }
  50% { opacity: 1; }
  64%, 100% { opacity: 0; }
}
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }