/* ============================================================
   Brother Built — marketing design system
   Modern CSS: OKLCH color, nesting, @layer, container queries,
   :has(), scroll-driven animation, view transitions, @property.
   ============================================================ */
@layer tokens, base, layout, components, utilities;

@layer tokens {
  :root{
    /* OKLCH: perceptually even ramps, wide-gamut on new displays */
    --ink:          oklch(0.22 0.012 250);
    --ink-2:        oklch(0.50 0.014 250);
    --ink-3:        oklch(0.66 0.012 250);
    --line:         oklch(0.91 0.006 250);
    --line-2:       oklch(0.955 0.004 250);
    --surface:      oklch(1 0 0);
    --surface-2:    oklch(0.985 0.003 250);
    --surface-3:    oklch(0.962 0.005 250);
    --deep:         oklch(0.24 0.022 255);
    --deep-2:       oklch(0.30 0.028 255);
    --accent:       oklch(0.58 0.155 258);
    --accent-2:     oklch(0.50 0.155 258);
    --accent-soft:  oklch(0.95 0.028 258);
    --ok:           oklch(0.52 0.11 155);
    --ok-soft:      oklch(0.95 0.04 155);
    --warn:         oklch(0.60 0.11 75);
    --warn-soft:    oklch(0.96 0.05 85);
    --bad:          oklch(0.55 0.16 25);
    --bad-soft:     oklch(0.95 0.04 25);

    --r-xs:6px; --r-sm:10px; --r-md:14px; --r-lg:20px; --r-xl:28px; --r-full:999px;
    --shadow-1:0 1px 2px oklch(0.22 0.012 250/.05), 0 4px 14px -6px oklch(0.22 0.012 250/.10);
    --shadow-2:0 2px 4px oklch(0.22 0.012 250/.05), 0 18px 40px -18px oklch(0.22 0.012 250/.22);
    --shadow-3:0 40px 90px -40px oklch(0.22 0.012 250/.45);
    --ease:linear(0,.006,.026,.056,.098,.15,.212,.282,.36,.443,.53,.616,.696,.77,.832,.884,.925,.955,.976,.989,.996,1);
    --ease-out:cubic-bezier(.22,.85,.25,1);
    --ease-spring:linear(0,.245,.69,.983,1.14,1.183,1.162,1.11,1.056,1.016,.995,.988,.991,.997,1.002,1.004,1.002,1);
    --t-fast:.14s; --t:.22s; --t-slow:.38s;
    --step:clamp(64px,7vw,112px);
    --measure:62ch;
    color-scheme:light;
  }
  @media (prefers-color-scheme: dark){
    :root:not([data-theme=light]){
      --ink:oklch(0.96 0.006 250); --ink-2:oklch(0.76 0.012 250); --ink-3:oklch(0.60 0.012 250);
      --line:oklch(0.32 0.012 255); --line-2:oklch(0.26 0.010 255);
      --surface:oklch(0.19 0.014 255); --surface-2:oklch(0.22 0.016 255); --surface-3:oklch(0.26 0.018 255);
      --deep:oklch(0.16 0.016 255); --deep-2:oklch(0.22 0.020 255);
      --accent:oklch(0.72 0.145 258); --accent-2:oklch(0.80 0.130 258); --accent-soft:oklch(0.30 0.070 258);
      --ok-soft:oklch(0.28 0.055 155); --warn-soft:oklch(0.30 0.055 85); --bad-soft:oklch(0.30 0.060 25);
      --shadow-1:0 1px 2px #0006, 0 4px 14px -6px #0008;
      --shadow-2:0 2px 4px #0006, 0 18px 40px -18px #000a;
      --shadow-3:0 40px 90px -40px #000c;
      color-scheme:dark;
    }
  }
  [data-theme=dark]{
    --ink:oklch(0.96 0.006 250); --ink-2:oklch(0.76 0.012 250); --ink-3:oklch(0.60 0.012 250);
    --line:oklch(0.32 0.012 255); --line-2:oklch(0.26 0.010 255);
    --surface:oklch(0.19 0.014 255); --surface-2:oklch(0.22 0.016 255); --surface-3:oklch(0.26 0.018 255);
    --deep:oklch(0.16 0.016 255); --deep-2:oklch(0.22 0.020 255);
    --accent:oklch(0.72 0.145 258); --accent-2:oklch(0.80 0.130 258); --accent-soft:oklch(0.30 0.070 258);
    --ok-soft:oklch(0.28 0.055 155); --warn-soft:oklch(0.30 0.055 85); --bad-soft:oklch(0.30 0.060 25);
    color-scheme:dark;
  }
  @property --sweep { syntax:'<percentage>'; inherits:false; initial-value:0%; }
}

@layer base {
  *,*::before,*::after{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;
    --safe-t:env(safe-area-inset-top,0px); --safe-b:env(safe-area-inset-bottom,0px);
    --safe-l:env(safe-area-inset-left,0px); --safe-r:env(safe-area-inset-right,0px);
    --hdr-h:66px;
    scroll-padding-top:calc(var(--hdr-h) + var(--safe-t) + 12px)}
  @media (prefers-reduced-motion:reduce){
    html{scroll-behavior:auto}
    *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}
    .btn:hover,.piece:hover,.plan:hover,.card.lift:hover,.cap:hover{transform:none !important}
  }
  button,a,label,summary,[role=button]{-webkit-tap-highlight-color:transparent}
  body{margin:0;background:var(--surface);color:var(--ink);font-family:"Inter Tight","Inter",system-ui,-apple-system,"Segoe UI",sans-serif;font-size:16px;line-height:1.55;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:clip}
  h1,h2,h3,h4{margin:0;font-weight:600;letter-spacing:-.03em;line-height:1.08;text-wrap:balance}
  p{margin:0;text-wrap:pretty}
  a{color:inherit;text-decoration:none}
  img,svg,video{display:block;max-width:100%}
  :focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-xs)}
  ::selection{background:var(--accent-soft);color:var(--ink)}
  ::view-transition-old(root),::view-transition-new(root){animation-duration:.28s}
  @view-transition { navigation: auto }
}

@layer layout {
  .wrap{width:min(1160px,100% - 40px - var(--safe-l) - var(--safe-r));margin-inline:auto;
    padding-inline-start:0;padding-inline-end:0}
  .wrap-sm{width:min(760px,100% - 40px - var(--safe-l) - var(--safe-r));margin-inline:auto}
  @supports (padding: max(0px)){
    .wrap,.wrap-sm{margin-left:max(auto,var(--safe-l));margin-right:max(auto,var(--safe-r))}
  }
  section{padding-block:var(--step)}
  .stack > * + *{margin-top:var(--gap,20px)}
  .grid{display:grid;gap:var(--gap,20px)}
  .cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}
  @media (max-width:960px){ .cols-3,.cols-4{grid-template-columns:repeat(2,minmax(0,1fr))} }
  @media (max-width:620px){ .cols-2,.cols-3,.cols-4{grid-template-columns:1fr} }
  .split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,64px);align-items:center}
  @media (max-width:900px){ .split{grid-template-columns:1fr} }
}

@layer components {
  /* ---------- type ---------- */
  .display{font-size:clamp(38px,6.2vw,78px);letter-spacing:-.045em;line-height:.96;font-weight:600}
  .h2{font-size:clamp(27px,3.6vw,44px);letter-spacing:-.035em}
  .h3{font-size:clamp(19px,2vw,23px);letter-spacing:-.02em}
  .lede{font-size:clamp(17px,1.5vw,20px);color:var(--ink-2);max-width:var(--measure)}
  .muted{color:var(--ink-2)}
  .fine{font-size:13.5px;color:var(--ink-3)}
  .eyebrow{font-size:13.5px;font-weight:600;color:var(--accent);margin-bottom:12px}

  /* ---------- buttons ---------- */
  .btn{--bg:var(--ink);--fg:var(--surface);--bd:var(--ink);
    display:inline-flex;align-items:center;justify-content:center;gap:9px;
    font:inherit;font-size:15px;font-weight:550;line-height:1.2;
    padding:12px 20px;border-radius:var(--r-full);border:1px solid var(--bd);background:var(--bg);color:var(--fg);
    cursor:pointer;white-space:nowrap;position:relative;overflow:hidden;isolation:isolate;
    transition:transform var(--t) var(--ease-spring), background var(--t-fast), border-color var(--t-fast), box-shadow var(--t), opacity var(--t-fast);
    &::after{content:"";position:absolute;inset:0;z-index:-1;background:radial-gradient(circle at var(--mx,50%) var(--my,50%), oklch(1 0 0/.18), transparent 60%);opacity:0;transition:opacity var(--t)}
    &:hover{transform:translateY(-1.5px);box-shadow:0 6px 18px -8px oklch(0.22 0.012 250/.4)}
    &:hover::after{opacity:1}
    &:active{transform:translateY(0) scale(.97);transition-duration:var(--t-fast);box-shadow:none}
    &:disabled{opacity:.5;cursor:default;transform:none}
    &.accent{--bg:var(--accent);--bd:var(--accent);--fg:oklch(1 0 0)}
    &.accent:hover{--bg:var(--accent-2);--bd:var(--accent-2)}
    &.quiet{--bg:transparent;--fg:var(--ink);--bd:var(--line)}
    &.quiet:hover{--bd:var(--ink-3);background:var(--surface-2)}
    &.bare{--bg:transparent;--fg:var(--ink);--bd:transparent;padding-inline:8px}
    &.sm{font-size:13.5px;padding:8px 14px}
    &.lg{font-size:16.5px;padding:15px 26px}
    &.block{width:100%}
  }
  .arrow{transition:transform .2s var(--ease-out)}
  a:hover > .arrow, .btn:hover .arrow{transform:translateX(3px)}

  /* ---------- surfaces ---------- */
  .card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:clamp(18px,2.4vw,26px)}
  .card.pad-lg{padding:clamp(24px,3.4vw,40px)}
  .card.soft{background:var(--surface-2)}
  .card.lift{box-shadow:var(--shadow-1);transition:box-shadow var(--t-slow), transform var(--t-slow) var(--ease-out), border-color var(--t)}
  .card.lift:hover{box-shadow:var(--shadow-2);transform:translateY(-3px);border-color:var(--ink-3)}
  .band{background:var(--deep);color:oklch(0.97 0.004 250)}
  .band .lede,.band .muted{color:oklch(0.80 0.010 250)}
  .band .card{background:var(--deep-2);border-color:oklch(1 0 0/.10)}
  .rule{height:1px;background:var(--line);border:0;margin:0}
  details{interpolate-size:allow-keywords}
  details::details-content{block-size:0;overflow:clip;opacity:0;transition:content-visibility var(--t-slow) allow-discrete, opacity var(--t-slow), block-size var(--t-slow) var(--ease-out)}
  details[open]::details-content{block-size:auto;opacity:1}
  summary{transition:color var(--t-fast)}
  summary:hover{color:var(--accent)}

  /* ---------- header ---------- */
  .hdr{position:sticky;top:0;z-index:60;padding-top:var(--safe-t);background:color-mix(in oklab, var(--surface) 82%, transparent);backdrop-filter:blur(16px) saturate(1.6);-webkit-backdrop-filter:blur(16px) saturate(1.6);border-bottom:1px solid transparent;transition:border-color .2s, background .2s}
  .hdr[data-stuck]{border-bottom-color:var(--line)}
  .hdr .bar{display:flex;align-items:center;justify-content:space-between;gap:18px;height:var(--hdr-h)}
  .logo{display:inline-flex;align-items:center;gap:10px;font-weight:650;letter-spacing:-.025em;font-size:16.5px;view-transition-name:logo}
  .logo .mk{width:26px;height:26px;flex:none;color:var(--ink);transition:transform var(--t-slow) var(--ease-spring)}
  .logo:hover .mk{transform:scale(1.06)}
  .nav{display:flex;align-items:center;gap:4px}
  .nav a{position:relative;font-size:14.5px;font-weight:500;color:var(--ink-2);padding:8px 12px;border-radius:var(--r-full);transition:color var(--t-fast), background var(--t-fast)}
  .nav a::after{content:"";position:absolute;left:12px;right:12px;bottom:3px;height:1.5px;background:currentColor;border-radius:2px;transform:scaleX(0);transform-origin:center;transition:transform var(--t) var(--ease-out)}
  .nav a:hover{color:var(--ink)}
  .nav a:hover::after{transform:scaleX(1)}
  .nav a[aria-current=page]::after{transform:scaleX(1);background:var(--accent)}
  .nav a[aria-current=page]{color:var(--ink);font-weight:600}
  .hdr-cta{display:flex;align-items:center;gap:8px}
  @media (max-width:1000px){ .nav{display:none} }
  .menu-btn{display:none}
  @media (max-width:1000px){ .menu-btn{display:inline-flex} }
  dialog.sheet{border:0;padding:0;margin:0;width:min(420px,100vw);max-width:100vw;height:100dvh;max-height:100dvh;margin-left:auto;background:var(--surface);color:var(--ink);overscroll-behavior:contain}
  dialog.sheet::backdrop{background:oklch(0.20 0.02 255/.45);backdrop-filter:blur(3px)}
  dialog.sheet[open]{animation:sheet-in .34s var(--ease-out)}
  dialog.sheet[open]::backdrop{animation:fade-in .28s ease both}
  @keyframes sheet-in{from{transform:translateX(28px);opacity:0}to{transform:none;opacity:1}}
  @keyframes fade-in{from{opacity:0}to{opacity:1}}
  .sheet .inner{padding:calc(22px + var(--safe-t)) calc(24px + var(--safe-r)) calc(22px + var(--safe-b)) 24px;display:grid;gap:4px;height:100%;align-content:start;overflow-y:auto;-webkit-overflow-scrolling:touch}
  .sheet a.big{font-size:22px;font-weight:600;letter-spacing:-.02em;padding:12px 0;border-bottom:1px solid var(--line-2)}

  /* ---------- reveal on scroll (scroll-driven, no JS) ---------- */
  @supports (animation-timeline: view()){
    @media (prefers-reduced-motion: no-preference){
      .reveal{animation:reveal-in linear both;animation-timeline:view();animation-range:entry 5% cover 24%}
      @keyframes reveal-in{from{opacity:0;transform:translateY(20px) scale(.994)}to{opacity:1;transform:none}}
      .stagger > *{animation:reveal-in linear both;animation-timeline:view();animation-range:entry 2% cover 22%}
    }
  }
  /* progress bar driven by document scroll */
  @supports (animation-timeline: scroll()){
    .scrollbar{position:fixed;inset:0 0 auto 0;height:2.5px;z-index:70;background:linear-gradient(90deg,var(--accent),color-mix(in oklab,var(--accent) 55%, var(--ink)));transform-origin:0 50%;animation:sb linear both;animation-timeline:scroll(root)}
    @keyframes sb{from{transform:scaleX(0)}to{transform:scaleX(1)}}
  }

  /* ---------- device frames ---------- */
  .device{--w:290px;width:min(var(--w),86vw);aspect-ratio:9/18.6;background:oklch(0.17 0.012 255);border-radius:42px;padding:10px;box-shadow:var(--shadow-3), 0 0 0 1px oklch(0 0 0/.16);position:relative;container-type:inline-size}
  .device::after{content:"";position:absolute;top:19px;left:50%;translate:-50% 0;width:78px;height:22px;background:oklch(0.17 0.012 255);border-radius:12px;z-index:4}
  .device .screen{height:100%;border-radius:33px;overflow:hidden;background:var(--surface);color:var(--ink);position:relative;display:flex;flex-direction:column;--acc:var(--accent)}
  .device.sm{--w:232px}
  .laptop{background:oklch(0.17 0.012 255);border-radius:16px 16px 6px 6px;padding:12px 12px 0;box-shadow:var(--shadow-3);position:relative}
  .laptop .screen{aspect-ratio:16/10;border-radius:6px;overflow:hidden;background:var(--surface);position:relative}
  .laptop::after{content:"";display:block;height:11px;margin:8px -22px 0;border-radius:0 0 12px 12px;background:oklch(0.30 0.010 255)}

  /* ---------- tags / pills ---------- */
  .pill{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:600;padding:5px 11px;border-radius:var(--r-full);background:var(--surface-3);color:var(--ink-2)}
  .pill.accent{background:var(--accent-soft);color:var(--accent-2)}
  .pill.dot::before{content:"";width:7px;height:7px;border-radius:50%;background:currentColor}

  /* ---------- forms ---------- */
  .field{display:grid;gap:6px;font-size:13.5px;font-weight:550;color:var(--ink-2)}
  input,select,textarea{font:inherit;font-size:15px;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:var(--r-sm);padding:11px 13px;width:100%;transition:border-color var(--t-fast), box-shadow var(--t-fast), background var(--t-fast)}
  input:hover:not(:focus),select:hover:not(:focus),textarea:hover:not(:focus){border-color:var(--ink-3)}
  input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in oklab, var(--accent) 22%, transparent)}
  textarea{resize:vertical;min-height:92px}
  .choice{display:grid;gap:8px;grid-template-columns:repeat(auto-fit,minmax(min(100%,140px),1fr))}
  .choice label{position:relative;border:1px solid var(--line);border-radius:var(--r-sm);padding:12px 14px;font-size:14.5px;font-weight:550;cursor:pointer;background:var(--surface);transition:border-color var(--t-fast), box-shadow var(--t), background var(--t-fast), transform var(--t) var(--ease-spring)}
  .choice label:hover{border-color:var(--ink-3)}
  .choice label:active{transform:scale(.985)}
  .choice label:has(input:checked){transform:scale(1.012)}
  .choice label small{display:block;font-weight:450;color:var(--ink-2);font-size:12.5px;margin-top:2px}
  .choice input{position:absolute;inset:0;width:100%;height:100%;opacity:0;margin:0;cursor:pointer}
  .choice label:has(input:checked){border-color:var(--accent);box-shadow:0 0 0 2px color-mix(in oklab, var(--accent) 30%, transparent);background:var(--accent-soft)}
  .note{border-radius:var(--r-sm);padding:12px 14px;font-size:14px;font-weight:500;background:var(--accent-soft);color:var(--accent-2)}
  .note.bad{background:var(--bad-soft);color:var(--bad)}
  .note.ok{background:var(--ok-soft);color:var(--ok)}

  /* ---------- footer ---------- */
  .ftr{border-top:1px solid var(--line);padding-block:52px calc(60px + var(--safe-b));font-size:14.5px;color:var(--ink-2)}
  .ftr h4{font-size:13px;font-weight:600;color:var(--ink);margin-bottom:12px}
  .ftr a{display:block;padding:5px 0;color:var(--ink-2)}
  .ftr a:hover{color:var(--ink)}
  .ftr .cols{display:grid;grid-template-columns:1.6fr repeat(3,1fr);gap:32px}
  @media (max-width:760px){ .ftr .cols{grid-template-columns:1fr 1fr} }

  /* ---------- mobile action bar ---------- */
  .dock{position:fixed;inset:auto 0 0 0;z-index:55;display:none;gap:10px;padding:10px calc(16px + var(--safe-r)) calc(10px + var(--safe-b)) calc(16px + var(--safe-l));background:color-mix(in oklab, var(--surface) 88%, transparent);backdrop-filter:blur(14px);border-top:1px solid var(--line)}
  .dock .btn{flex:1}
  @media (max-width:760px){ .dock{display:flex} body{padding-bottom:calc(76px + var(--safe-b))} }

  .toast{position:fixed;left:50%;bottom:calc(24px + var(--safe-b));translate:-50% 14px;scale:.96;z-index:80;background:var(--ink);color:var(--surface);padding:11px 17px;border-radius:var(--r-full);font-size:14px;font-weight:500;opacity:0;transition:opacity var(--t), translate var(--t-slow) var(--ease-spring), scale var(--t-slow) var(--ease-spring);pointer-events:none;box-shadow:var(--shadow-2)}
  .toast.on{opacity:1;translate:-50% 0;scale:1}
}

@layer utilities {
  .center{text-align:center;margin-inline:auto}
  .mt-0{margin-top:0}.mt-1{margin-top:8px}.mt-2{margin-top:16px}.mt-3{margin-top:24px}.mt-4{margin-top:36px}.mt-5{margin-top:52px}
  .row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
  .hide{display:none !important}
  .sr{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}
}

@layer components {
  /* Installed-to-home-screen tweaks */
  @media (display-mode: standalone), (display-mode: fullscreen){
    html, body{overscroll-behavior-y:none;background:var(--surface)}
    /* iOS reports the status bar area; keep the sticky header below it */
    .hdr{background:var(--surface)}
    /* nothing should sit under the home indicator */
    section:last-of-type{padding-bottom:calc(var(--step) + var(--safe-b))}
  }
  /* long dialogs must scroll on a phone, not clip */
  dialog.viewer, dialog:not(.sheet){max-height:min(92dvh, 100dvh - 2rem);overflow:auto;overscroll-behavior:contain}
  /* iOS zooms in on focus when inputs are under 16px */
  @media (max-width:860px){
    input,select,textarea{font-size:16px}
  }
}