/* ============================================================
   BAI-Desk — baidesk.app
   One system. Tokens first, no magic numbers.
   ============================================================ */

/* ---- Fonts (self-hosted, subset) ---- */
@font-face{font-family:"Playfair Display";src:url("/assets/fonts/playfair-400.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Playfair Display";src:url("/assets/fonts/playfair-600.woff2") format("woff2");font-weight:600;font-style:normal;font-display:swap}
@font-face{font-family:"Playfair Display";src:url("/assets/fonts/playfair-700.woff2") format("woff2");font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:"Playfair Display";src:url("/assets/fonts/playfair-800.woff2") format("woff2");font-weight:800;font-style:normal;font-display:swap}
@font-face{font-family:"Inter";src:url("/assets/fonts/inter-400.woff2") format("woff2");font-weight:400;font-style:normal;font-display:swap}
@font-face{font-family:"Inter";src:url("/assets/fonts/inter-500.woff2") format("woff2");font-weight:500;font-style:normal;font-display:swap}
@font-face{font-family:"Inter";src:url("/assets/fonts/inter-600.woff2") format("woff2");font-weight:600;font-style:normal;font-display:swap}
@font-face{font-family:"Inter";src:url("/assets/fonts/inter-700.woff2") format("woff2");font-weight:700;font-style:normal;font-display:swap}

/* ---- Design tokens ---- */
:root{
  /* color */
  --ink:#0B0B0D;            /* near-black canvas */
  --ink-2:#121216;          /* raised surface */
  --ink-3:#1A1A20;          /* hairline fills */
  --paper:#F6F4EF;          /* cream */
  --paper-dim:#CFCCC4;      /* muted body on dark */
  --paper-faint:#8A887F;    /* captions */
  --line:rgba(246,244,239,.10);
  --line-2:rgba(246,244,239,.18);
  --accent:#C9A24B;         /* single accent — brushed gold */
  --accent-soft:rgba(201,162,75,.14);

  /* type */
  --serif:"Playfair Display",Georgia,"Times New Roman",serif;
  --sans:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  /* modular scale, ratio 1.25, fluid via clamp */
  --fs-caption:clamp(.72rem,.68rem + .2vw,.8rem);
  --fs-body:clamp(1rem,.96rem + .25vw,1.12rem);
  --fs-lede:clamp(1.18rem,1.04rem + .7vw,1.5rem);
  --fs-h3:clamp(1.5rem,1.2rem + 1.4vw,2.1rem);
  --fs-h2:clamp(2.1rem,1.4rem + 3.2vw,4rem);
  --fs-h1:clamp(2.8rem,1.6rem + 5.6vw,6.5rem);

  /* spacing — 8px rhythm */
  --s-1:8px; --s-2:16px; --s-3:24px; --s-4:40px; --s-5:64px;
  --s-6:96px; --s-7:140px; --s-8:200px;
  --wrap:1240px; --wrap-narrow:720px;
  --gutter:clamp(20px,5vw,72px);

  /* motion */
  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-soft:cubic-bezier(.4,0,.2,1);
  --d-1:.4s; --d-2:.8s; --d-3:1.2s;

  /* form */
  --radius:3px; --radius-lg:10px;
  --shadow:0 30px 80px -40px rgba(0,0,0,.8);
  --shadow-soft:0 20px 60px -30px rgba(0,0,0,.65);
}

/* ---- Reset ---- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--ink);color:var(--paper);
  font-family:var(--sans);font-size:var(--fs-body);line-height:1.65;
  font-feature-settings:"ss01","cv05";-webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;overflow-x:hidden}
img,video{max-width:100%;display:block;height:auto}
h1,h2,h3,p,figure,ol,ul{margin:0}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}

/* film grain over the whole canvas */
body::after{content:"";position:fixed;inset:0;z-index:9999;pointer-events:none;
  opacity:.04;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}

/* ---- Layout primitives ---- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.wrap--narrow{max-width:var(--wrap-narrow)}
.center{text-align:center}
.section{padding-block:var(--s-7)}
.section__head{max-width:760px;margin-bottom:var(--s-6)}
.grid{display:grid;gap:clamp(32px,5vw,80px)}
.grid--split{grid-template-columns:1fr 1fr;align-items:start}
.grid--middle{align-items:center}
@media (max-width:980px){.grid--split{grid-template-columns:1fr}}

/* ---- Type helpers ---- */
.h-serif{font-family:var(--serif);font-weight:700;line-height:1.04;
  font-size:var(--fs-h2);letter-spacing:-.015em}
.h-serif--xl{font-size:var(--fs-h1)}
h3.h-serif{font-size:var(--fs-h3);font-weight:600;letter-spacing:-.01em}
.eyebrow{font-size:var(--fs-caption);text-transform:uppercase;letter-spacing:.32em;
  color:var(--accent);font-weight:600;margin-bottom:var(--s-3)}
.lede{font-size:var(--fs-lede);line-height:1.5;color:var(--paper-dim);
  max-width:46ch;margin-top:var(--s-3)}
.center .lede{margin-inline:auto}
.fineprint{font-size:var(--fs-caption);color:var(--paper-faint);margin-top:var(--s-3)}
.tabular{font-variant-numeric:tabular-nums lining-nums}

/* ---- Buttons ---- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.6em;
  font-weight:600;font-size:.95rem;letter-spacing:.01em;border-radius:var(--radius);
  padding:.9em 1.6em;transition:transform var(--d-1) var(--ease),
  background var(--d-1) var(--ease),color var(--d-1) var(--ease),border-color var(--d-1) var(--ease)}
.btn--lg{padding:1.05em 2em}
.btn--xl{padding:1.2em 2.6em;font-size:1.05rem}
.btn--full{width:100%}
.btn--download{background:var(--accent);color:var(--ink)}
.btn--download:hover{transform:translateY(-2px);background:#D9B560}
.btn--ghost{border:1px solid var(--line-2);color:var(--paper)}
.btn--ghost:hover{border-color:var(--accent);color:var(--accent)}

/* ---- Skip link ---- */
.skip-link{position:fixed;top:-100px;left:var(--gutter);z-index:10001;
  background:var(--accent);color:var(--ink);padding:.7em 1.2em;border-radius:var(--radius);
  transition:top var(--d-1) var(--ease)}
.skip-link:focus{top:16px}

/* ---- Preloader ---- */
.preloader{position:fixed;inset:0;z-index:10000;display:grid;place-items:center;
  background:var(--ink);color:var(--accent);transition:opacity .9s var(--ease),visibility .9s}
.preloader__mark{opacity:.25;animation:pulse 1.6s var(--ease-soft) infinite}
.preloader__mark img{width:72px;height:72px;border-radius:16px;display:block}
@keyframes pulse{0%,100%{opacity:.2;transform:translateY(2px)}50%{opacity:.9;transform:translateY(-2px)}}
body:not(.is-loading) .preloader{opacity:0;visibility:hidden}

/* ---- Nav ---- */
.nav{position:fixed;top:0;left:0;right:0;z-index:900;transition:background var(--d-2) var(--ease),
  backdrop-filter var(--d-2) var(--ease),border-color var(--d-2) var(--ease);
  border-bottom:1px solid transparent}
.nav__inner{max-width:var(--wrap);margin-inline:auto;padding:var(--s-3) var(--gutter);
  display:flex;align-items:center;justify-content:space-between;transition:padding var(--d-2) var(--ease)}
.nav.is-scrolled{background:rgba(11,11,13,.72);backdrop-filter:blur(14px) saturate(120%);
  border-bottom-color:var(--line)}
.nav.is-scrolled .nav__inner{padding-block:var(--s-2)}
.nav__brand{display:flex;align-items:center;gap:.6em;color:var(--paper)}
.nav__logo{width:30px;height:30px;border-radius:7px;display:block}
.nav__word{font-family:var(--serif);font-weight:700;font-size:1.15rem;letter-spacing:.01em}
.nav__links{display:flex;align-items:center;gap:clamp(16px,2.5vw,36px)}
.nav__links a{font-size:.92rem;color:var(--paper-dim);transition:color var(--d-1) var(--ease)}
.nav__links a:hover{color:var(--paper)}
.nav__links .btn--download{padding:.6em 1.2em}
@media (max-width:620px){.nav__links a:not(.btn){display:none}}

/* ---- Hero (copy + live scrolling phone) ---- */
.hero{position:relative;min-height:92svh;display:flex;align-items:center;
  padding-top:calc(var(--s-7) + 10px);padding-bottom:var(--s-6);overflow:hidden}
.hero__inner{width:100%;grid-template-columns:1.08fr .92fr}
.hero__glow{position:absolute;top:-14%;right:-6%;width:60vw;height:60vw;
  max-width:880px;max-height:880px;z-index:-1;pointer-events:none;
  background:radial-gradient(circle at 60% 42%,rgba(201,162,75,.15),transparent 62%)}
.hero__title{font-family:var(--serif);font-weight:800;
  font-size:clamp(2.6rem,1.3rem + 3.8vw,4.6rem);
  line-height:1;letter-spacing:-.02em;max-width:14ch;margin-top:var(--s-2)}
.hero__sub{font-size:var(--fs-lede);color:var(--paper-dim);max-width:42ch;margin-top:var(--s-4)}
.hero__actions{display:flex;flex-wrap:wrap;gap:var(--s-2);margin-top:var(--s-5)}
.hero__visual{display:flex;justify-content:center}

/* ---- Phone mockup with auto-scroll ---- */
.phone{position:relative;width:min(300px,76vw);aspect-ratio:300/600;
  border-radius:40px;padding:12px;background:linear-gradient(160deg,#2a2a2e,#121214);
  box-shadow:0 60px 120px -50px rgba(0,0,0,.95),0 0 0 1px rgba(201,162,75,.35),
    inset 0 0 0 2px rgba(201,162,75,.18);isolation:isolate}
.phone__notch{position:absolute;top:18px;left:50%;transform:translateX(-50%);z-index:3;
  width:42%;height:22px;background:#0a0a0c;border-radius:0 0 14px 14px}
.phone__screen{position:relative;width:100%;height:100%;overflow:hidden;
  border-radius:30px;background:#0b0b0d}
.phone__shot{position:absolute;top:0;left:0;width:100%;height:auto;display:block}
.phone__fade{position:absolute;left:0;right:0;bottom:0;height:20%;z-index:2;pointer-events:none;
  background:linear-gradient(0deg,#0b0b0d 4%,rgba(11,11,13,0) 100%)}

@media (max-width:980px){
  .hero{min-height:auto;padding-top:calc(var(--s-6) + 30px)}
  .hero__inner{grid-template-columns:1fr}
  .hero__visual{margin-top:var(--s-4)}
}

/* ---- See it in motion (film) ---- */
.section--showcase{padding-top:var(--s-6);padding-bottom:var(--s-7)}
.showcase__head{max-width:none;margin:0 auto var(--s-5)}
.showcase{margin:0 auto;max-width:1120px;aspect-ratio:16/9;overflow:hidden;
  border-radius:var(--radius-lg);border:1px solid var(--line-2);
  background:var(--ink-2);box-shadow:var(--shadow)}
.showcase__video{width:100%;height:100%;object-fit:cover;display:block}
@media (max-width:640px){.showcase{aspect-ratio:1/1}}

/* ---- Device frame ---- */
.device{position:relative;border-radius:var(--radius-lg);overflow:hidden;
  background:var(--ink-2);border:1px solid var(--line-2);box-shadow:var(--shadow);
  outline:1px solid rgba(0,0,0,.4);outline-offset:-1px}
.device img{width:100%;display:block}
.device figcaption{position:absolute;left:var(--s-2);bottom:var(--s-2);
  font-size:var(--fs-caption);letter-spacing:.14em;text-transform:uppercase;
  color:var(--paper);background:rgba(11,11,13,.55);backdrop-filter:blur(6px);
  padding:.4em .8em;border-radius:var(--radius)}
.device--wide{margin-bottom:clamp(24px,4vw,56px)}
.device--phone{max-width:300px;margin-inline:auto;border-radius:28px}

/* ---- How it works ---- */
.moments{list-style:none;padding:0;display:grid;gap:var(--s-7)}
.moment{display:grid;grid-template-columns:1.4fr 1fr;gap:clamp(28px,5vw,72px);align-items:center}
.moment--rev{grid-template-columns:1fr 1.4fr}
.moment--rev .device{order:2}
.moment__num{font-family:var(--serif);font-size:1rem;color:var(--accent);
  display:block;margin-bottom:var(--s-2);letter-spacing:.1em}
.moment__copy h3{margin-bottom:var(--s-2)}
.moment__copy p{color:var(--paper-dim);max-width:38ch}
@media (max-width:860px){.moment,.moment--rev{grid-template-columns:1fr}.moment--rev .device{order:0}}

/* ---- Gallery ---- */
.gallery__pair{display:grid;grid-template-columns:1fr 1fr;gap:clamp(20px,3vw,40px)}
@media (max-width:760px){.gallery__pair{grid-template-columns:1fr}}

/* ---- Download ---- */
.section--download{padding-block:var(--s-8);
  background:radial-gradient(120% 80% at 50% 0%,rgba(201,162,75,.08) 0%,transparent 60%)}
.section--download .btn{margin-top:var(--s-5)}

/* ---- Footer ---- */
.footer{border-top:1px solid var(--line);padding-block:var(--s-5);color:var(--paper-faint)}
.footer__inner{display:grid;gap:var(--s-3)}
.footer__brand{display:flex;flex-wrap:wrap;align-items:baseline;gap:var(--s-2)}
.footer__brand .nav__word{color:var(--paper)}
.footer__tag{font-size:var(--fs-caption);letter-spacing:.06em}
.footer__links{display:flex;gap:var(--s-3);font-size:.92rem}
.footer__links a{color:var(--paper-dim);transition:color var(--d-1) var(--ease)}
.footer__links a:hover{color:var(--accent)}
.footer__legal{font-size:var(--fs-caption);max-width:60ch;line-height:1.7}

/* ---- Modal ---- */
.modal{position:fixed;inset:0;z-index:10002;display:grid;place-items:center;
  padding:var(--gutter);opacity:0;visibility:hidden;transition:opacity var(--d-2) var(--ease),visibility var(--d-2)}
.modal.is-open{opacity:1;visibility:visible}
.modal__scrim{position:absolute;inset:0;background:rgba(5,5,7,.78);backdrop-filter:blur(8px)}
.modal__panel{position:relative;width:100%;max-width:460px;background:var(--ink-2);
  border:1px solid var(--line-2);border-radius:var(--radius-lg);padding:clamp(28px,5vw,48px);
  box-shadow:var(--shadow);transform:translateY(18px) scale(.98);transition:transform var(--d-2) var(--ease)}
.modal.is-open .modal__panel{transform:none}
.modal__close{position:absolute;top:14px;right:18px;font-size:1.8rem;line-height:1;
  color:var(--paper-faint);transition:color var(--d-1) var(--ease)}
.modal__close:hover{color:var(--paper)}
.modal__lede{color:var(--paper-dim);margin-top:var(--s-2);font-size:.98rem}

/* ---- Form ---- */
.access-form{margin-top:var(--s-4);display:grid;gap:var(--s-3)}
.field{display:block}
.field__label{display:block;font-size:var(--fs-caption);letter-spacing:.14em;
  text-transform:uppercase;color:var(--paper-faint);margin-bottom:.6em}
.field input{width:100%;background:var(--ink);border:1px solid var(--line-2);color:var(--paper);
  padding:.9em 1em;border-radius:var(--radius);font-size:1rem;transition:border-color var(--d-1) var(--ease)}
.field input:focus{border-color:var(--accent);outline:none}
.field input::placeholder{color:var(--paper-faint)}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.access-form__msg{font-size:.9rem;min-height:1.2em;margin:0}
.access-form__msg.is-error{color:#E2896B}
.access-form__msg.is-ok{color:var(--accent)}

/* ---- Reveal (scroll) + 3D fold ---- */
.reveal{opacity:0;transform:translateY(28px);
  transition:opacity var(--d-3) var(--ease),transform var(--d-3) var(--ease)}
.reveal.is-in{opacity:1;transform:none}
[data-fold]{transform:perspective(1600px) rotateX(10deg) translateY(40px);
  transform-origin:center top;opacity:0;
  transition:transform 1.3s var(--ease),opacity 1.1s var(--ease)}
[data-fold].is-in{transform:perspective(1600px) rotateX(0) translateY(0);opacity:1}

@media (prefers-reduced-motion:reduce){
  .reveal,[data-fold]{opacity:1!important;transform:none!important;transition:none!important}
  .preloader__mark,.hero__cue span{animation:none}
  .hero__cue{display:none}
}

/* ---- Legal / prose pages ---- */
.doc{padding-top:calc(var(--s-7) + 40px)}
.doc .h-serif{margin-bottom:var(--s-2)}
.doc .eyebrow{margin-bottom:var(--s-2)}
.prose{max-width:66ch;color:var(--paper-dim);margin-top:var(--s-5)}
.prose h2{font-family:var(--serif);font-weight:600;font-size:var(--fs-h3);
  color:var(--paper);letter-spacing:-.01em;margin:var(--s-5) 0 var(--s-2)}
.prose p{margin-bottom:var(--s-3);line-height:1.75}
.prose ul{margin:0 0 var(--s-3) 1.2em;padding:0}
.prose li{margin-bottom:.5em}
.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.doc__back{display:inline-block;margin-top:var(--s-5);color:var(--accent);
  font-size:.92rem;text-decoration:underline;text-underline-offset:3px}