/* LaBook's welcome page. The colours and fonts are the app's own (public/css/style.css),
   so the page and the screens it shows look like one thing. */

:root {
  --bg:        #ffffff;
  --bg-tint:   #f6f7f9;
  --panel:     #ffffff;
  --ink:       #17181c;
  --ink-soft:  #5d6169;
  --line:      #e3e4e8;
  --accent:    #2f5fd0;
  --accent-ink:#ffffff;
  --accent-bg: #eaf0fd;
  --mint:      #0e6b62;
  --bar:       #eceef1;
  --glow:      rgb(47 95 208 / .16);
  --shadow:    0 1px 2px rgb(16 24 40 / .06), 0 24px 60px -18px rgb(16 24 40 / .28);
  --radius:    12px;
  --font-sans: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --gutter:    24px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #111215;
    --bg-tint:   #16171b;
    --panel:     #1b1d22;
    --ink:       #e9eaee;
    --ink-soft:  #9aa0aa;
    --line:      #2a2d34;
    --accent:    #7ba3f5;
    --accent-ink:#0d1526;
    --accent-bg: #1e2a44;
    --mint:      #5cc5b6;
    --bar:       #23252b;
    --glow:      rgb(123 163 245 / .14);
    --shadow:    0 1px 2px rgb(0 0 0 / .4), 0 30px 70px -20px rgb(0 0 0 / .7);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 17px/1.6 var(--font-sans);
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
figure { margin: 0; }
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -0.02em; line-height: 1.15; text-wrap: balance; }
p { margin: 0; }

.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 var(--gutter); }
.wrap-wide { max-width: 1240px; }

/* --- buttons --------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 22px; border-radius: 9px;
  background: var(--accent); color: var(--accent-ink);
  font: 600 16px/1.2 var(--font-sans); text-decoration: none;
  border: 1px solid transparent;
  transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 6px 18px -6px var(--accent); }
.btn:focus-visible, .pillar:focus-visible, .tool-tabs button:focus-visible, .top-links a:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 3px;
}
.btn-small { padding: 8px 16px; font-size: 15px; }
.btn-quiet { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-quiet:hover { box-shadow: none; border-color: var(--ink-soft); }
.btn-disabled { background: var(--bar); color: var(--ink-soft); cursor: default; }
.btn-disabled:hover { transform: none; box-shadow: none; }
.soon {
  font: 500 12px/1 var(--font-mono); letter-spacing: .02em;
  padding: 4px 7px; border-radius: 99px;
  background: var(--accent-bg); color: var(--accent);
}

/* --- the bar at the top ------------------------------------------------------ */
.top {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--line);
}
.top-inner { display: flex; align-items: center; gap: 28px; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; font-size: 19px; text-decoration: none; letter-spacing: -0.01em; }
.brand img { flex: none; }
/* The logo's B faces the other way; it still reads as a B.
   Mirrored, the B's room swaps sides too: in IBM Plex Sans it has 0.082em
   on its straight side and 0.047em on its round one, so turned round it sat
   0.035em too close to the a and as far too far from the o. Moved back by
   the difference, it sits where an unturned B would. */
.wordmark .flip-b { display: inline-block; transform: translateX(0.035em) scaleX(-1); }
.top-links { display: flex; gap: 24px; margin-left: auto; }
.top-links a { color: var(--ink-soft); text-decoration: none; font-size: 15px; }
.top-links a:hover { color: var(--ink); }

/* --- hero -------------------------------------------------------------------- */
.hero { padding: 88px 0 40px; text-align: center; position: relative; overflow: hidden; }
.hero::before {
  content: ''; position: absolute; inset: 30% -10% auto; height: 70%;
  background: radial-gradient(closest-side, var(--glow), transparent);
  pointer-events: none;
}
.eyebrow {
  font: 500 13px/1 var(--font-mono); letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 18px;
}
/* Free, and still growing: said wherever LaBook first meets someone. */
.beta-tag {
  display: inline-block; margin-left: 8px; padding: 4px 9px; border-radius: 999px; vertical-align: 1px;
  background: var(--accent-bg); color: var(--accent);
  font: 600 11px/1 var(--font-mono); letter-spacing: .06em; text-transform: uppercase;
}
.download-card .beta-note { max-width: 520px; margin: 14px auto 0; color: var(--ink-soft); font-size: 15px; line-height: 1.55; }
.download-card .beta-note .beta-tag { margin: 0 6px 0 0; }
.hero h1 { font-size: clamp(2.3rem, 5.4vw, 4rem); letter-spacing: -0.03em; }
.hero h1 .line { display: block; }
.lede { max-width: 640px; margin: 22px auto 0; font-size: clamp(1.05rem, 1.6vw, 1.2rem); color: var(--ink-soft); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin: 34px 0 60px; }
.hero-window { position: relative; }

/* --- a window around a screenshot ------------------------------------------------ */
.window {
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); background: var(--panel);
  box-shadow: var(--shadow);
}
.window-bar {
  display: flex; align-items: center; gap: 7px;
  height: 30px; padding: 0 12px; position: relative;
  background: var(--bar); border-bottom: 1px solid var(--line);
}
.window-bar i { width: 11px; height: 11px; border-radius: 50%; background: #ff5f57; }
.window-bar i:nth-child(2) { background: #febc2e; }
.window-bar i:nth-child(3) { background: #28c840; }
.window-bar span {
  position: absolute; left: 0; right: 0; text-align: center;
  font-size: 12px; font-weight: 500; color: var(--ink-soft); pointer-events: none;
}
.shot {
  border-radius: var(--radius); overflow: hidden;
  border: 1px solid var(--line); box-shadow: var(--shadow);
}

/* --- the four things --------------------------------------------------------------- */
.pillars { padding: 40px 0 24px; }
.pillar-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.pillar {
  display: grid; gap: 6px; padding: 22px; border-radius: var(--radius);
  border: 1px solid var(--line); text-decoration: none;
  transition: border-color .15s ease, background .15s ease;
}
.pillar:hover { border-color: var(--accent); background: var(--accent-bg); }
.pillar svg {
  width: 26px; height: 26px; margin-bottom: 6px;
  fill: none; stroke: var(--accent); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round;
}
.pillar strong { font-size: 17px; }
.pillar span { color: var(--ink-soft); font-size: 15px; line-height: 1.5; }

/* --- the sections ------------------------------------------------------------------- */
.feature { padding: 104px 0; }
.feature-tint { background: var(--bg-tint); border-block: 1px solid var(--line); }
.feature h2 { font-size: clamp(1.8rem, 3.4vw, 2.6rem); margin-bottom: 18px; }
.feature-words p + p { margin-top: 14px; }
.feature-words > p:not(.eyebrow) { color: var(--ink-soft); font-size: 18px; }
.feature-words strong { color: var(--ink); font-weight: 600; }
.feature-words-wide { max-width: 760px; margin-bottom: 48px; }

.split { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 64px; align-items: center; }
.split-flip { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.split-flip > .feature-words { order: 2; }
.stack { display: grid; gap: 20px; }

.ticks { list-style: none; padding: 0; margin: 26px 0 0; display: grid; gap: 14px; }
.ticks li { position: relative; padding-left: 30px; color: var(--ink-soft); font-size: 16px; line-height: 1.55; }
.ticks li::before {
  content: ''; position: absolute; left: 0; top: .3em; width: 18px; height: 18px; border-radius: 50%;
  background: var(--accent-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Cpath d='M5 9.3l2.6 2.5L13 6.4' fill='none' stroke='%232f5fd0' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 18px no-repeat;
}
@media (prefers-color-scheme: dark) {
  .ticks li::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Cpath d='M5 9.3l2.6 2.5L13 6.4' fill='none' stroke='%237ba3f5' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  }
}
.ticks-row { grid-template-columns: repeat(3, 1fr); gap: 28px; margin-top: 30px; }
#plan .feature-words-wide { max-width: none; }
#plan .feature-words-wide > p:not(.eyebrow) { max-width: 760px; }

.q {
  display: inline-grid; place-items: center; width: 1.25em; height: 1.25em; border-radius: 50%;
  border: 1px solid var(--line); font: 500 .75em/1 var(--font-mono); color: var(--ink-soft);
  vertical-align: .12em;
}

/* --- analysis tabs ------------------------------------------------------------------- */
.tool-tabs {
  display: flex; flex-wrap: wrap; gap: 6px; padding: 5px; margin-bottom: 22px;
  border: 1px solid var(--line); border-radius: 11px; background: var(--panel); width: fit-content; max-width: 100%;
}
.tool-tabs button {
  appearance: none; border: 0; background: transparent; cursor: pointer;
  padding: 9px 18px; border-radius: 7px;
  font: 500 15px/1.2 var(--font-sans); color: var(--ink-soft);
}
.tool-tabs button:hover { color: var(--ink); }
.tool-tabs button[aria-selected="true"] { background: var(--accent-bg); color: var(--accent); }
.tool + .tool { margin-top: 56px; }          /* only seen with no script, when every tool shows */
.tool[hidden] { display: none; }
.tool-words { max-width: 760px; color: var(--ink-soft); margin-bottom: 26px; font-size: 17px; }

/* --- the lab ------------------------------------------------------------------------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { padding: 26px; border-radius: var(--radius); border: 1px solid var(--line); background: var(--panel); }
.card h3 { font-size: 18px; margin-bottom: 10px; }
.card p { color: var(--ink-soft); font-size: 16px; line-height: 1.55; }

/* --- download ------------------------------------------------------------------------ */
.download { padding: 112px 0; }
.download-card {
  display: grid; justify-items: center; gap: 14px; text-align: center;
  padding: 64px 24px; border-radius: 20px; border: 1px solid var(--line);
  background: radial-gradient(120% 90% at 50% 0%, var(--glow), transparent 70%), var(--panel);
}
.download-card img { border-radius: 20px; box-shadow: 0 14px 40px -12px rgb(33 72 168 / .55); margin-bottom: 8px; }
.download-card h2 { font-size: clamp(1.8rem, 3.4vw, 2.4rem); }
.download-card p { color: var(--ink-soft); font-size: 18px; margin-bottom: 10px; }
.platforms {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px;
  width: 100%; max-width: 860px; margin-top: 6px;
}
.platform {
  display: grid; gap: 2px; justify-items: center; padding: 18px 12px 14px;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg);
  text-decoration: none; transition: border-color .15s ease, transform .15s ease;
}
.platform:hover { border-color: var(--accent); transform: translateY(-1px); }
.platform:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.platform strong { font-size: 18px; }
.platform span { color: var(--ink-soft); font-size: 14px; line-height: 1.35; }
.platform small { margin-top: 6px; font: 500 12px/1 var(--font-mono); color: var(--ink-soft); }
/* The one for the computer this page is open on. */
.platform.this-computer { border-color: var(--accent); background: var(--accent-bg); }
.platform.this-computer strong { color: var(--accent); }
.first-time { max-width: 720px; margin-top: 14px; text-align: left; color: var(--ink-soft); font-size: 15px; }
.first-time summary { cursor: pointer; text-align: center; color: var(--ink); font-weight: 500; }
.first-time ul { margin: 12px 0 0; padding-left: 20px; display: grid; gap: 8px; }
.first-time code { font: 13px var(--font-mono); background: var(--bar); padding: 1px 5px; border-radius: 4px; }

/* --- footer -------------------------------------------------------------------------- */
.foot { border-top: 1px solid var(--line); padding: 28px 0 36px; color: var(--ink-soft); font-size: 14px; }
.foot-inner { display: flex; flex-wrap: wrap; gap: 12px 28px; align-items: center; justify-content: space-between; }
.brand-small { font-size: 15px; color: var(--ink); gap: 8px; }

/* --- smaller screens ----------------------------------------------------------------- */
@media (max-width: 980px) {
  .split, .split-flip { grid-template-columns: minmax(0, 1fr); gap: 40px; }
  .split-flip > .feature-words { order: 0; }
  .pillar-grid { grid-template-columns: repeat(2, 1fr); }
  .platforms { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .ticks-row { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .feature { padding: 80px 0; }
}
@media (max-width: 760px) {
  .top-links { display: none; }
  .top-inner { justify-content: space-between; }
}
@media (max-width: 600px) {
  :root { --gutter: 16px; }
  body { font-size: 16px; }
  .hero { padding: 56px 0 28px; }
  .hero h1 .line { display: inline; }
  .hero-actions { margin-bottom: 40px; }
  .hero-actions .btn { width: 100%; justify-content: center; }
  .pillar-grid, .cards { grid-template-columns: minmax(0, 1fr); }
  .feature { padding: 64px 0; }
  .feature-words > p:not(.eyebrow) { font-size: 16.5px; }
  .tool-tabs { width: 100%; display: grid; grid-template-columns: 1fr 1fr; }
  .tool-tabs button { padding: 9px 12px; }
  .window-bar { height: 22px; }
  .window-bar i { width: 8px; height: 8px; }
  .window-bar span { display: none; }
  .download { padding: 72px 0; }
  .download-card { padding: 48px 20px; }
  .foot-inner { flex-direction: column; align-items: flex-start; }
}