/* Brand tokens: AI Business Detective presentation brand system v1.0 (approved 2026-10-19). */
:root{
  color-scheme:dark;
  --bg:#0d141c;          /* canvas */
  --ink:#f4f4ed;         /* primary text */
  --mint:#8cdec7;        /* primary accent: one phrase, borders, focus */
  --slate:#b7c9df;       /* secondary accent / tagline */
  --dim:#acb8c6;         /* muted supporting text */
  --line:#2b3b48;        /* divider */
  --ivory:#f3f0e6;       /* brand surface */
  --panel:#15212c;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--mint)}
a:focus-visible,button:focus-visible{outline:2px solid var(--mint);outline-offset:3px;border-radius:4px}
.wrap{max-width:1100px;margin:0 auto;padding:0 28px}

/* Header */
.site-header{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:22px 0}
.brand{display:flex;align-items:center;gap:12px;color:var(--ink);text-decoration:none;font-weight:700;letter-spacing:-.01em}
.brand .emblem{width:46px;height:30px;flex:none}
.brand .emblem span,.brand .emblem i{width:28px;height:28px;top:1px}
.brand .emblem i{left:16px}
.brand .emblem b{font-size:16px;left:17px;top:5px}
.nav{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.nav a{color:var(--dim);text-decoration:none;font-size:14px;padding:8px 12px;border-radius:8px;border:1px solid transparent}
.nav a:hover{color:var(--ink);border-color:var(--line)}
.nav a[aria-current=page]{color:var(--ink);border-color:var(--mint)}
.motion-toggle{background:var(--panel);color:var(--dim);border:1px solid var(--line);border-radius:8px;padding:7px 10px;font:inherit;font-size:12px;cursor:pointer}
.motion-toggle:hover{border-color:var(--mint);color:var(--ink)}

/* Type system */
.chapter{font-size:12px;letter-spacing:.17em;font-weight:700;color:var(--mint);text-transform:uppercase;margin:0;animation:chapterArrive .8s both}
h1{font-size:clamp(40px,6.4vw,76px);line-height:1.05;letter-spacing:-.052em;margin:22px 0 24px;max-width:980px;animation:headlineArrive .7s .1s both}
h1 .accent{display:block;color:var(--mint)}
h2{font-size:clamp(28px,3.6vw,40px);line-height:1.1;letter-spacing:-.04em;margin:0 0 14px}
h2 .accent{color:var(--mint)}
.tagline{font-family:Georgia,"Times New Roman",serif;font-style:italic;font-weight:400;color:var(--slate);text-align:right;font-size:clamp(20px,2.4vw,27px);line-height:1.3;letter-spacing:-.01em;margin:0 0 32px;max-width:980px;animation:headlineArrive .7s .25s both}
.lede{color:var(--dim);font-size:19px;max-width:640px;margin:0}

/* Hero */
.hero{padding:38px 0 56px}

/* Video frame with slow perimeter trace (decorative, pointer-inert) */
.video{position:relative;aspect-ratio:16/9;border:1px solid var(--line);border-radius:16px;background:radial-gradient(120% 90% at 30% 20%,#17283a 0%,#0f1a24 55%,#0b1118 100%);overflow:hidden;animation:artArrive .9s .35s both}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video .trace{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.video .trace rect{fill:none;stroke:var(--mint);stroke-opacity:.7;stroke-width:.22;stroke-linecap:round;stroke-dasharray:5 95;animation:ambientTrace 14s linear infinite}
.video .placeholder{position:absolute;inset:0;display:grid;place-content:center;justify-items:center;gap:16px;text-align:center;color:var(--dim)}
.play{width:78px;height:78px;border-radius:50%;border:1px solid #8cdec788;display:grid;place-items:center;animation:closingHalo 5s ease-in-out infinite}
.play:after{content:"";border-left:20px solid var(--mint);border-top:12px solid transparent;border-bottom:12px solid transparent;margin-left:6px}
.placeholder small{font-size:13px;letter-spacing:.12em;text-transform:uppercase}

/* Section */
section{padding:64px 0;border-top:1px solid var(--line)}
.section-head{max-width:720px;margin-bottom:34px}
.section-head p{color:var(--dim);margin:0}

/* Workflow: task -> approved data -> AI output -> human review (illustrative pattern, static) */
.flow{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:14px;counter-reset:step}
.flow li{position:relative;border:1px solid var(--line);border-radius:14px;padding:22px 20px;background:#111b25;counter-increment:step}
.flow li:before{content:"0" counter(step);display:block;font-size:12px;letter-spacing:.17em;font-weight:700;color:var(--mint);margin-bottom:14px}
.flow li:not(:last-child):after{content:"→";position:absolute;right:-13px;top:50%;transform:translateY(-50%);color:var(--slate);font-size:18px;z-index:1;background:var(--bg);line-height:1;padding:2px 0}
.flow b{display:block;font-size:19px;letter-spacing:-.02em;margin-bottom:6px}
.flow span{color:var(--dim);font-size:15px;line-height:1.5}
.note{color:var(--dim);font-size:13px;margin:18px 0 0}

/* Cue list */
.cues{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.cues div{border-left:2px solid var(--mint);padding-left:16px}
.cues b{display:block;font-size:19px;letter-spacing:-.02em;margin-bottom:4px}
.cues span{color:var(--dim);font-size:15px}

/* Close / CTA with orbital signature */
.close{display:grid;grid-template-columns:auto 1fr;gap:44px;align-items:center}
.emblem{width:115px;height:90px;position:relative}
.emblem span{position:absolute;width:74px;height:74px;border:1px solid #8cdec777;border-radius:50%;top:5px;left:0;animation:closingOrbit 10s ease-in-out infinite}
.emblem i{position:absolute;width:74px;height:74px;border:1px solid #b7c9df66;border-radius:50%;top:5px;left:32px;animation:closingOrbit 10s -5s ease-in-out infinite reverse}
.emblem b{position:absolute;left:37px;top:18px;font-size:35px;line-height:1;color:var(--mint);font-weight:400;animation:closingArrow 6s ease-in-out infinite}
.btn{display:inline-block;background:var(--mint);color:#0d141c;text-decoration:none;font-weight:700;padding:13px 22px;border-radius:10px;margin-top:20px}
.btn:hover{background:#a6e8d5}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line);margin-left:8px}
.btn.ghost:hover{border-color:var(--mint)}
.email{font-size:clamp(20px,2.6vw,28px);letter-spacing:-.02em;color:var(--ink);text-decoration:none;position:relative;display:inline-block}
.email:after{content:"";display:block;height:1px;margin-top:7px;background:linear-gradient(90deg,var(--mint),#b7c9df77);transform:scaleX(.18);transform-origin:left;transition:transform .35s ease}
.email:hover:after,.email:focus-visible:after{transform:scaleX(1)}

/* Case study page */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.case-grid div{border:1px solid var(--line);border-radius:14px;padding:22px 20px;background:#111b25}
.case-grid .label{font-size:12px;letter-spacing:.17em;font-weight:700;color:var(--mint);text-transform:uppercase;display:block;margin-bottom:10px}
.case-grid p{color:var(--dim);margin:0;font-size:15px}
.status{display:inline-block;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--slate);border:1px solid var(--line);border-radius:999px;padding:5px 12px;margin-bottom:20px}

footer{border-top:1px solid var(--line);padding:28px 0 40px;color:var(--dim);font-size:13px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}
footer a{color:var(--dim)}

/* Motion vocabulary (shared with presentation) */
@keyframes chapterArrive{from{opacity:0;letter-spacing:.24em}to{opacity:1}}
@keyframes headlineArrive{from{opacity:0;transform:translateY(9px)}to{opacity:1;transform:none}}
@keyframes artArrive{from{opacity:0;transform:translateY(12px) scale(.985)}to{opacity:1;transform:none}}
@keyframes ambientTrace{to{stroke-dashoffset:-100}}
@keyframes closingOrbit{0%,100%{transform:translateY(0) scaleY(1)}50%{transform:translateY(-3px) scaleY(.84)}}
@keyframes closingArrow{0%,30%,100%{transform:translateX(0)}55%{transform:translateX(5px)}}
@keyframes closingHalo{0%,100%{opacity:.55}50%{opacity:1}}

/* Motion off (toggle) and system reduced-motion: everything visible, nothing moving */
html.no-motion *,html.no-motion *:before,html.no-motion *:after{animation:none!important;transition:none!important}
@media (prefers-reduced-motion:reduce){
  *,*:before,*:after{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
}

/* Narrow layout */
@media (max-width:820px){
  .flow{grid-template-columns:1fr 1fr}
  .flow li:nth-child(2):after{display:none}
  .cues,.case-grid{grid-template-columns:1fr}
}
@media (max-width:560px){
  .wrap{padding:0 16px}
  .site-header{flex-wrap:wrap}
  .hero{padding:26px 0 40px}
  h1{margin:18px 0}
  .tagline{margin-bottom:26px}
  .flow{grid-template-columns:1fr}
  .flow li:after{display:none}
  .close{grid-template-columns:1fr;gap:20px}
  .btn.ghost{margin-left:0}
  section{padding:48px 0}
}