/* ROCKTIER — Nothing OS-inspired tokens */
:root{
  --bg:#000000;
  --bg2:#0a0a0a;
  --card:rgba(255,255,255,0.03);
  --card-hover:rgba(255,255,255,0.06);
  --border:rgba(255,255,255,0.08);
  --border-hover:rgba(255,255,255,0.15);
  --text:rgba(255,255,255,0.95);
  --text2:rgba(255,255,255,0.55);
  --text3:rgba(255,255,255,0.35);
  --accent:#ffffff;
  --on-accent:#000000;
  --accent-glow:rgba(255,255,255,0.15);
  --red:#FF4A3D;
  --dot:rgba(255,255,255,0.55);
  --head-bg:rgba(0,0,0,0.8);
  --radius-sm:12px;
  --radius-md:20px;
  --radius-lg:28px;
  --maxw:72rem;
  --s2:.75rem;--s3:1rem;--s4:1.5rem;--s5:2.5rem;--s6:4rem;--s7:6rem;
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",Helvetica,Arial,sans-serif;
  --mono:"SF Mono","JetBrains Mono","Fira Code",ui-monospace,monospace;
}
/* Day / light theme (monochrome inversion of the dark default) */
[data-theme="light"]{
  --bg:#ffffff;
  --bg2:#f5f5f5;
  --card:rgba(0,0,0,0.03);
  --card-hover:rgba(0,0,0,0.06);
  --border:rgba(0,0,0,0.1);
  --border-hover:rgba(0,0,0,0.2);
  --text:rgba(0,0,0,0.92);
  --text2:rgba(0,0,0,0.6);
  --text3:rgba(0,0,0,0.42);
  --accent:#000000;
  --on-accent:#ffffff;
  --accent-glow:rgba(0,0,0,0.12);
  --red:#E64537;
  --dot:rgba(0,0,0,0.55);
  --head-bg:rgba(255,255,255,0.85);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
/* P1: compensate for the 64px sticky header when jumping to anchors */
[id]{scroll-margin-top:80px}
body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased}
::selection{background:rgba(255,255,255,.15)}
[data-theme="light"] ::selection{background:rgba(0,0,0,.12)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 var(--s4)}

.skip{position:absolute;left:-9999px;top:1rem;background:var(--accent);color:var(--on-accent);padding:.5rem .9rem;border-radius:100px;z-index:60}
.skip:focus{left:1rem}

/* nav */
.site-head{position:sticky;top:0;z-index:40;background:var(--head-bg);backdrop-filter:blur(20px);border-bottom:1px solid var(--border)}
.head-row{display:flex;align-items:center;gap:var(--s4);height:64px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--text)}
.brand-mark{width:30px;height:30px;flex-shrink:0;color:var(--text)}
.brand-mark rect{fill:currentColor}
.brand-mark.sm{width:24px;height:24px}
.brand-word{font-weight:700;letter-spacing:-.02em;font-size:1.15rem}
.brand-word span{color:var(--accent)}
.brand-word i{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--red);margin-left:6px;vertical-align:2px}
.links{display:flex;align-items:center;gap:var(--s4);margin-left:auto}
.links a{color:var(--text2);text-decoration:none;font-size:.95rem;transition:color .15s}
/* Touch target: expand nav link hit height to 44px without changing layout */
.links a::before{content:"";position:absolute;top:50%;left:-6px;right:-6px;height:44px;transform:translateY(-50%)}
.links a:hover{color:var(--text)}
.head-actions{display:flex;align-items:center;gap:10px}
.ghost{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text2);width:34px;height:34px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s}
.ghost:hover{background:var(--card-hover);border-color:var(--border-hover);color:var(--text)}
/* Touch target: expand the hit area to 44x44px without changing the visual size */
.ghost,.lang{position:relative}
.ghost::before,.lang::before{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:44px;height:44px}
.sun{display:block}.moon{display:none}
[data-theme="light"] .sun{display:none}[data-theme="light"] .moon{display:block}
.lang{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-sm);color:var(--text2);font-size:11px;font-weight:600;letter-spacing:.5px;padding:7px 14px;cursor:pointer;transition:all .2s}
.lang:hover{background:var(--card-hover);border-color:var(--border-hover);color:var(--text)}

/* hero */
.hero{position:relative;overflow:hidden;padding:var(--s7) 0 var(--s6)}
.hero-in{text-align:center;position:relative;z-index:2}
.eyebrow{letter-spacing:.22em;text-transform:uppercase;font-size:.76rem;font-weight:600;color:var(--text3);font-family:var(--mono);margin:0 0 var(--s3)}
.display{font-size:clamp(2.9rem,9vw,6rem);line-height:1.02;letter-spacing:-.025em;font-weight:800;margin:0 0 var(--s4)}
.lead{font-size:clamp(1.05rem,2.4vw,1.3rem);color:var(--text2);max-width:44ch;margin:0 auto var(--s5)}
.cta-row{display:flex;gap:var(--s3);justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;background:var(--accent);color:var(--on-accent);font-weight:600;padding:.85rem 1.7rem;border-radius:var(--radius-md);text-decoration:none;font-size:.95rem;transition:all .2s cubic-bezier(.25,.1,.25,1)}
.btn:hover{box-shadow:0 0 30px var(--accent-glow),0 8px 24px rgba(0,0,0,.4);transform:translateY(-1px)}
.ghost-link{color:var(--text);text-decoration:none;padding:.85rem .4rem;font-weight:500;border-bottom:1px solid var(--border-hover)}
.ghost-link:hover{color:var(--accent);border-color:var(--accent)}

/* Antigravity-inspired monochrome particle field (canvas) */
.ptx-bg{position:absolute;top:-12%;left:0;width:100%;height:124%;z-index:0;pointer-events:none;will-change:transform}
.hero-in{z-index:2}

/* dot-matrix typewriter for the hero display title */
.tw{display:inline-block;min-width:1px;white-space:pre-wrap}
.caret{font-style:normal;font-weight:300;color:var(--accent);animation:blink 1.1s steps(1,end) infinite}
@keyframes blink{50%{opacity:0}}

/* Nothing OS dot-matrix motif */
.dotframe{position:absolute;inset:0;z-index:0;opacity:.22;
  background-image:radial-gradient(var(--dot) 1px,transparent 1.6px);
  background-size:22px 22px;
  -webkit-mask-image:radial-gradient(60% 60% at 50% 40%,#000 30%,transparent 75%);
  mask-image:radial-gradient(60% 60% at 50% 40%,#000 30%,transparent 75%)}
.dot.red{position:absolute;width:10px;height:10px;border-radius:50%;background:var(--red);
  box-shadow:0 0 24px var(--red);top:34%;left:50%;transform:translateX(210px);z-index:0;animation:pulse 3s ease-in-out infinite}
@keyframes pulse{50%{opacity:.35}}

/* sections */
.section{padding:var(--s7) 0}
.section.alt{background:var(--bg2)}
.sec-head{max-width:60ch;margin-bottom:var(--s5)}
.sec-title{font-size:clamp(1.7rem,4vw,2.6rem);letter-spacing:-.02em;font-weight:700;line-height:1.15;margin:0}
.sec-head.center{text-align:center;margin-left:auto;margin-right:auto}
.links a.active{color:var(--text)}

/* about: name story */
.name-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:var(--s4)}
.name-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:var(--s5);backdrop-filter:blur(20px);transition:all .25s}
.name-card:hover{background:var(--card-hover);border-color:var(--border-hover)}
.name-glyph{font-size:4rem;font-weight:800;line-height:1;letter-spacing:-.03em;color:var(--accent);display:block;margin-bottom:var(--s2)}
.name-card .sec-title{margin-bottom:var(--s3)}
.name-card p{color:var(--text2);margin:0;font-size:1rem}
.col-title{font-size:1.2rem;font-weight:600;margin:0 0 .4rem}

/* products */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--s4)}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius-md);padding:var(--s4);
  backdrop-filter:blur(20px);transition:all .25s cubic-bezier(.25,.1,.25,1)}
.card:hover{background:var(--card-hover);border-color:var(--border-hover);transform:translateY(-3px);box-shadow:0 20px 40px rgba(0,0,0,.3),0 0 60px rgba(255,255,255,.03)}
.card.featured{border-color:var(--accent)}
.card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--s4)}
.mark{min-width:38px;height:38px;padding:0 .5rem;border-radius:12px;border:1px solid var(--border);display:inline-flex;align-items:center;justify-content:center;font-weight:700}
.mark.t{font-family:var(--mono);color:var(--text2)}
.chip{font-family:var(--mono);font-size:.72rem;font-weight:600;color:var(--text3);border:1px solid var(--border);padding:.25rem .6rem;border-radius:100px;letter-spacing:.08em}
.chip.live{color:var(--on-accent);background:var(--accent);border-color:var(--accent)}
.card-name{font-size:1.3rem;font-weight:600;letter-spacing:-.01em;margin:0 0 .3rem}
.card-name span{color:var(--accent)}
.card-desc{color:var(--text2);margin:0;font-size:.95rem}

/* philosophy */
.cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:var(--s5)}
.col .tick{font-family:var(--mono);font-size:.8rem;color:var(--text3);margin-bottom:var(--s3);display:inline-block;letter-spacing:.15em}
.col h3{font-size:1.2rem;font-weight:600;margin:0 0 .4rem}
.col p{color:var(--text2);margin:0}

/* cta banner */
.banner{border:1px solid var(--border);background:var(--card);backdrop-filter:blur(20px);border-radius:var(--radius-lg);padding:var(--s6) var(--s4);text-align:center}
.banner p{color:var(--text2);max-width:46ch;margin:var(--s3) auto var(--s5)}

/* footer */
.foot{border-top:1px solid var(--border);padding:var(--s5) 0}
.foot-row{display:flex;flex-wrap:wrap;gap:var(--s3);align-items:center;color:var(--text3);font-size:.9rem}
.foot-row .brand{color:var(--text2)}
.foot .dot{display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--red);vertical-align:2px;margin-left:2px}
.copy{margin-left:auto;font-family:var(--mono);font-size:.8rem}

@media (max-width:720px){
  /* P2: keep nav reachable on mobile — let it wrap below the top row instead of hiding it */
  .head-row{flex-wrap:wrap;height:auto;padding:10px 0 10px}
  .links{margin-left:0;width:100%;order:3;gap:18px;justify-content:flex-start;overflow-x:auto;padding-top:10px;margin-top:6px;border-top:1px solid var(--border);-webkit-overflow-scrolling:touch}
  .links a{white-space:nowrap;font-size:.92rem}
  .brand{flex:1}
}
@media (prefers-reduced-motion:reduce){
  *{scroll-behavior:auto!important;transition:none!important;animation:none!important}
  .card:hover{transform:none}
} 
/* scrollbar */
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(255,255,255,.1);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:rgba(255,255,255,.2)}
[data-theme="light"] ::-webkit-scrollbar-thumb{background:rgba(0,0,0,.15)}
[data-theme="light"] ::-webkit-scrollbar-thumb:hover{background:rgba(0,0,0,.25)}

/* motion — lightweight, dependency-free (research: Micro-interaction Lab / css-skills style) */
/* scroll reveal */
.js-anim .rv{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s cubic-bezier(.16,1,.3,1)}
.js-anim .rv.in{opacity:1;transform:none}
/* brand mark: lay one tier at a time on load (1→2→3→4 = 10 blocks) */
.brand-mark rect{transform-box:fill-box;transform-origin:center;animation:lay .5s ease both}
.brand-mark rect:nth-of-type(1){animation-delay:0s}
.brand-mark rect:nth-of-type(2){animation-delay:.05s}
.brand-mark rect:nth-of-type(3){animation-delay:.10s}
.brand-mark rect:nth-of-type(4){animation-delay:.15s}
.brand-mark rect:nth-of-type(5){animation-delay:.20s}
.brand-mark rect:nth-of-type(6){animation-delay:.25s}
.brand-mark rect:nth-of-type(7){animation-delay:.30s}
.brand-mark rect:nth-of-type(8){animation-delay:.35s}
.brand-mark rect:nth-of-type(9){animation-delay:.40s}
.brand-mark rect:nth-of-type(10){animation-delay:.45s}
@keyframes lay{from{transform:translateY(-130%) scale(.15);opacity:0}to{transform:none;opacity:1}}
/* card icon lift on hover */
.mark{transition:transform .25s ease}
.card:hover .mark{transform:translateY(-2px)}
/* nav underline grows from left */
.links a{position:relative}
.links a::after{content:"";position:absolute;left:0;right:0;bottom:-5px;height:1px;background:currentColor;transform:scaleX(0);transform-origin:left;transition:transform .25s ease}
.links a:hover::after,.links a.active::after{transform:scaleX(1)}