/* Shared look for concepts 7 and 8: a paragraph card tilted in 3D, with sources,
   questions and the change log floating at different depths around it. */
:root {
  --base: #131209; --surface: #181818; --raised: #1f1f1f; --hi: #272727; --line: #313131;
  --fade: #9b9b9b; --gold: #d9a441; --gold-pale: #f4d9a0; --glow: #f2c063; --ember: #8a5a1c;
  --green: #496748; --green-hover: #557a54; --green-light: #6e9a6c; --green-pale: #cfe3cd; --conflict: #ea4335;
  --c-blue: #4285f4; --c-red: #ea4335; --c-yellow: #fbbc04; --c-green: #34a853; --c-purple: #673ab7; /* category colours */
  --ink: #fff; --h1-from: #fff; --edge: #3a3a3a; --conflict-pale: #f2b3a6; --shadow: 1; /* --shadow scales every drop shadow */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}
/* LIGHT THEME: theme.js puts `light` on <html>; the accents and category colours stay the same */
html.light {
  --base: #faf7ef; --surface: #f1ece0; --raised: #e9e3d4; --hi: #e2dbca; --line: #ddd5c3;
  --ink: #131209; --fade: #666666; --gold: #9a6b1c; --gold-pale: #7a531a; --green-light: #496748; --green-pale: #2f4a2e;
  --h1-from: #000; --edge: #d3cab6; --conflict-pale: #b3261e; --shadow: .3;
}
* { box-sizing: border-box; margin: 0; }
body { background: var(--base); color: var(--ink); font-family: Geist, system-ui, sans-serif; -webkit-font-smoothing: antialiased; }
section.hero { position: relative; min-height: 100svh; padding: 96px 16px 64px; display: flex; flex-direction: column; justify-content: center; overflow: hidden; }
.wrap { width: 100%; max-width: 1280px; margin: 0 auto; display: grid; gap: 48px; align-items: center; grid-template-columns: 1fr; }
@media (min-width: 1100px) { .wrap { grid-template-columns: 4fr 7fr; } }
.tag { position: absolute; top: 24px; left: 50%; transform: translateX(-50%); font-size: 12px; line-height: 16px; color: var(--gold); border: 1px solid var(--ember); border-radius: 9999px; padding: 4px 12px; white-space: nowrap; z-index: 5; }
.logo { position: absolute; top: 24px; left: 24px; display: flex; align-items: center; gap: 8px; font-size: 14px; letter-spacing: .08em; text-transform: uppercase; z-index: 5; }
.logo svg { width: 20px; height: 20px; color: var(--green-light); }
h1 { max-width: 680px; font-size: 36px; line-height: 40px; font-weight: 600; letter-spacing: -0.02em; text-wrap: balance; background: linear-gradient(to right, var(--h1-from), var(--fade)); -webkit-background-clip: text; background-clip: text; color: transparent; padding-bottom: 4px; }
.sub { max-width: 680px; margin-top: 16px; font-size: 18px; line-height: 28px; color: color-mix(in srgb, var(--ink) 65%, transparent); text-wrap: pretty; }
.cta { display: inline-flex; align-items: center; gap: 8px; margin-top: 32px; background: var(--green); color: #fff; text-decoration: none; font-size: 16px; font-weight: 600; padding: 8px 12px; border-radius: 12px; transition: background-color .3s var(--ease), transform .3s var(--ease); }
.cta:hover { background: var(--green-hover); } .cta:active { transform: scale(.98); }
.cta:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; }
@media (min-width: 768px) { h1 { font-size: 60px; line-height: 1; } .sub { font-size: 20px; } }
@media (min-width: 1100px) { h1 { font-size: 48px; } }

/* 3D STAGE */
.stage { position: relative; height: 600px; perspective: 1600px; }
.scene { position: absolute; inset: 0; transform-style: preserve-3d; transform: rotateX(8deg) rotateY(-14deg); transition: transform .6s var(--ease), opacity .4s var(--ease); }
.scene.fading { opacity: 0; }
.card { position: absolute; border-radius: 24px; background: var(--surface); border: 1px solid var(--edge); padding: 32px; box-shadow: 0 64px 120px rgb(0 0 0 / calc(.55 * var(--shadow))); }
.main { left: 80px; top: 40px; width: 560px; transform: translateZ(0); }
.float { position: absolute; transform-style: preserve-3d; }
@media (max-width: 1099px) { .stage { height: 640px; } .main { left: 50%; margin-left: -280px; } }
@media (max-width: 700px) { .stage { transform: scale(.62); transform-origin: top center; height: 420px; } }

/* PAGE TEXT */
.crumb { display: flex; justify-content: space-between; align-items: center; gap: 12px; font-size: 12px; line-height: 16px; color: var(--fade); }
.card h2 { margin-top: 8px; font-size: 30px; line-height: 36px; font-weight: 600; }
.card h3 { margin-top: 24px; font-size: 18px; line-height: 28px; font-weight: 600; }
.card p.para { margin-top: 12px; font-size: 16px; line-height: 28px; color: color-mix(in srgb, var(--ink) 82%, transparent); text-wrap: pretty; }
.ref { display: inline-grid; place-items: center; min-width: 20px; height: 18px; padding: 0 4px; margin-left: 2px; border-radius: 6px; font-size: 12px; line-height: 16px; vertical-align: 2px; background: rgba(217,164,65,.14); color: var(--gold-pale); transition: background-color .3s var(--ease), transform .3s var(--ease); }
.ref.fresh { background: var(--gold); color: var(--base); transform: scale(1.1); }
.sent { border-radius: 4px; transition: background-color .4s var(--ease), color .4s var(--ease); box-decoration-break: clone; -webkit-box-decoration-break: clone; padding: 1px 0; }
.sent.hot { background: rgba(242,192,99,.16); color: var(--ink); }
.sent.warn { background: rgba(234,67,53,.16); }
.sent.strike { color: var(--conflict); text-decoration: line-through; }
.sent.out { opacity: 0; transition: opacity .3s var(--ease); }
.w { opacity: 0; transition: opacity .25s var(--ease); }
.w.on { opacity: 1; }
.caret { display: inline-block; width: 2px; height: 18px; margin-left: 2px; vertical-align: -3px; background: var(--glow); animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.badge { display: inline-flex; align-items: center; gap: 4px; padding: 4px 8px; border-radius: 9999px; background: rgba(110,154,108,.15); color: var(--ink); opacity: 0; transition: opacity .4s var(--ease); }
.badge.on { opacity: 1; } .badge.ask-tone { background: rgba(234,67,53,.15); color: var(--ink); }

/* FLOATING PIECES */
.chip { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-radius: 12px; background: var(--raised); border: 1px solid var(--line); font-size: 14px; line-height: 20px; white-space: nowrap; box-shadow: 0 24px 48px rgb(0 0 0 / calc(.5 * var(--shadow))); transition: opacity .5s var(--ease), transform .6s var(--ease), border-color .3s var(--ease); }
.chip i { font-size: 20px; color: var(--gold); }
.chip small { display: block; font-size: 12px; line-height: 16px; color: var(--fade); }
.chip.read { border-color: rgba(110,154,108,.6); }
/* CATEGORY COLOURS: each kind of source keeps one colour across the demos */
.chip .ph-file-text { color: var(--c-blue); } .chip .ph-envelope-simple { color: var(--c-yellow); } .chip .ph-file-pdf { color: var(--c-red); }
.chip .ph-note { color: var(--c-green); } .chip .ph-video { color: var(--c-purple); }
.srcs { left: -40px; top: 72px; transform: translateZ(120px); display: flex; flex-direction: column; gap: 8px; }
.srcs .chip { opacity: 0; transform: translateX(-32px); }
.srcs .chip.in { opacity: 1; transform: none; }
.log { right: -24px; bottom: 32px; width: 260px; transform: translateZ(90px); display: flex; flex-direction: column; gap: 8px; }
.log .title { align-self: flex-start; font-size: 12px; line-height: 16px; color: var(--fade); text-transform: uppercase; letter-spacing: .08em; padding: 4px 8px; border-radius: 9999px; background: var(--raised); border: 1px solid var(--line); }
.entry { display: flex; gap: 12px; align-items: center; padding: 12px; border-radius: 12px; background: var(--raised); border: 1px solid var(--line); font-size: 14px; line-height: 20px; box-shadow: 0 24px 48px rgb(0 0 0 / calc(.5 * var(--shadow))); opacity: 0; transform: translateY(8px); transition: opacity .5s var(--ease), transform .5s var(--ease); }
.entry.in { opacity: 1; transform: none; }
.entry i { font-size: 20px; flex: none; }
.entry small { display: block; font-size: 12px; line-height: 16px; color: var(--fade); }
.entry .undo { margin-left: auto; font-size: 12px; line-height: 16px; color: var(--fade); }
.ask { right: -16px; top: 200px; width: 300px; transform: translateZ(170px) translateY(12px); opacity: 0; transition: opacity .5s var(--ease), transform .6s var(--ease); }
.ask.in { opacity: 1; transform: translateZ(170px); }
.ask .box { border-radius: 16px; background: var(--raised); border: 1px solid rgba(234,67,53,.55); padding: 16px; box-shadow: 0 32px 64px rgb(0 0 0 / calc(.6 * var(--shadow))); }
.ask p { font-size: 14px; line-height: 20px; color: color-mix(in srgb, var(--ink) 88%, transparent); }
.ask .opts { display: flex; gap: 8px; margin-top: 12px; }
.opt { flex: 1; font: inherit; font-size: 14px; line-height: 20px; padding: 8px 12px; border-radius: 8px; background: var(--hi); border: 1px solid var(--line); color: var(--ink); text-align: left; transition: background-color .3s var(--ease), border-color .3s var(--ease), transform .2s var(--ease); }
.opt small { display: block; font-size: 12px; line-height: 16px; color: var(--fade); }
.opt.pick { background: var(--green); border-color: var(--green-light); color: #fff; transform: scale(.98); }
.opt.pick small { color: #cfe3cd; } /* text on the green button stays light in both themes */
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }