:root{
    --bg: #0b0c10;
    --card: rgba(255,255,255,0.06);
    --card2: rgba(255,255,255,0.08);
    --text: rgba(255,255,255,0.92);
    --muted: rgba(255,255,255,0.70);
    --muted2: rgba(255,255,255,0.55);
    --line: rgba(255,255,255,0.10);
    --brand: #6ee7ff;
    --brand2:#a78bfa;
    --shadow: 0 20px 60px rgba(0,0,0,0.55);
    --radius: 0px;
    --radius2: 0px;
    --max: 1120px;
    --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    --sans: "Times New Roman", Times, serif;
  }

  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    margin:0;
    font-family: var(--sans);
    color: var(--text);
  background:
    /* Image layer (4K) + gentle dark overlay for readability */
    linear-gradient(180deg, rgba(11,12,16,0.52), rgba(11,12,16,0.72)),
    url("../assets/backgrounds/cortex_bg_01_4k.webp") center/cover no-repeat fixed,
    radial-gradient(1000px 600px at 20% -10%, rgba(110,231,255,0.18), transparent 60%),
    radial-gradient(900px 600px at 90% 0%, rgba(167,139,250,0.16), transparent 60%),
    radial-gradient(700px 500px at 60% 90%, rgba(110,231,255,0.10), transparent 55%),
    var(--bg);
min-height:100vh;
    line-height:1.55;
  }

  a{color:inherit; text-decoration:none}
  a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
    outline: 2px solid rgba(110,231,255,0.8);
    outline-offset: 3px;
    border-radius: 10px;
  }

  .container{max-width: var(--max); margin:0 auto; padding: 0 18px;}

  /* Top nav */
  .nav{
    position: sticky;
    top:0;
    z-index:50;
    backdrop-filter: blur(12px);
    background: rgba(11,12,16,0.65);
    border-bottom: 1px solid var(--line);
  }
  .nav-inner{display:flex; align-items:center; justify-content:space-between; padding: 14px 0; gap: 12px;}

  .brand{
    display:flex;
    align-items:center;
    gap: 10px;
    min-width: 180px;
  }
  .logo{
    width: 56px; height: 56px;
    border-radius: 18px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    box-shadow: 0 10px 30px rgba(0,0,0,0.35);
    overflow:hidden;
    flex: 0 0 auto;
  }
  .logo img{
    width: 100%; height: 100%;
    display:block;
    object-fit: cover;
  }
  .brand-title{display:flex; flex-direction:column; line-height:1.1}
  .brand-title strong{font-size: 14px; letter-spacing:0.6px}
  .brand-title span{font-size: 12px; color: var(--muted2)}

  .nav-links{display:flex; align-items:center; gap: 14px;}
  .nav-links a{font-size: 13px; color: var(--muted); padding: 8px 10px; border-radius: 12px; border:1px solid transparent}
  .nav-links a:hover{color: var(--text); border-color: rgba(255,255,255,0.12); background: rgba(255,255,255,0.04)}

  .cta{display:flex; align-items:center; gap: 10px;}
  .btn{
    border: 1px solid rgba(255,255,255,0.14);
    background: rgba(255,255,255,0.06);
    color: var(--text);
    padding: 10px 12px;
    border-radius: 14px;
    font-weight: 600;
    font-size: 13px;
    cursor:pointer;
    transition: transform 150ms ease, background 150ms ease, border-color 150ms ease;
  }
  .btn:hover{transform: translateY(-1px); background: rgba(255,255,255,0.09); border-color: rgba(255,255,255,0.20)}
  .btn.primary{
    border-color: rgba(110,231,255,0.35);
    background: linear-gradient(135deg, rgba(110,231,255,0.20), rgba(167,139,250,0.15));
  }

  .hamburger{display:none}

  /* Mobile menu */
  .mobile-menu{display:none; padding: 12px 0 18px;}
  .mobile-menu a{display:block; padding: 10px 12px; color: var(--muted); border-radius: 14px; border:1px solid transparent}
  .mobile-menu a:hover{color: var(--text); background: rgba(255,255,255,0.04); border-color: rgba(255,255,255,0.12)}

  /* Hero */
  .hero{padding: 54px 0 26px;}
  .hero-grid{display:grid; grid-template-columns: 1.3fr 0.7fr; gap: 18px; align-items:stretch;}

  .hero-card{
    border: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(255,255,255,0.07), rgba(255,255,255,0.03));
    border-radius: var(--radius2);
    box-shadow: var(--shadow);
    padding: 28px;
    position:relative;
    overflow:hidden;
  }
  .hero-card:before{
    content:"";
    position:absolute;
    inset:-120px -180px auto auto;
    width: 420px; height: 420px;
    background: radial-gradient(circle at 40% 40%, rgba(110,231,255,0.22), transparent 60%),
                radial-gradient(circle at 55% 45%, rgba(167,139,250,0.18), transparent 62%);
    transform: rotate(12deg);
    pointer-events:none;
  }

  .eyebrow{font-family: var(--mono); color: rgba(110,231,255,0.92); font-size: 12px; letter-spacing:0.8px; text-transform:uppercase}
  h1{margin: 10px 0 10px; font-size: 40px; line-height:1.08; letter-spacing:-0.6px}
  .sub{margin: 0 0 18px; color: var(--muted); font-size: 15px; max-width: 62ch;}

  .pill-row{display:flex; flex-wrap:wrap; gap: 8px; margin: 16px 0 22px;}
  .pill{font-family: var(--mono); font-size: 12px; color: rgba(255,255,255,0.78); border:1px solid rgba(255,255,255,0.12); background: rgba(255,255,255,0.04); padding: 7px 10px; border-radius: 999px;}

  .hero-actions{display:flex; gap: 10px; flex-wrap:wrap}

  .side-card{
    border: 1px solid var(--line);
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius2);
    padding: 20px;
    box-shadow: 0 16px 44px rgba(0,0,0,0.45);
    display:flex;
    flex-direction:column;
    justify-content:space-between;
    gap: 14px;
  }
  .side-card h3{margin:0; font-size: 14px; letter-spacing:0.2px}
  .side-card p{margin: 6px 0 0; color: var(--muted); font-size: 13px}

  .kpi{display:grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 10px;}
  .kpi .tile{border:1px solid rgba(255,255,255,0.10); background: rgba(255,255,255,0.04); padding: 12px; border-radius: 16px;}
  .kpi .tile strong{display:block; font-size: 14px}
  .kpi .tile span{color: var(--muted2); font-size: 12px}

  /* Sections */
  section{padding: 34px 0;}
  .section-head{display:flex; align-items:flex-end; justify-content:space-between; gap: 12px; margin-bottom: 14px;}
  .section-head h2{margin:0; font-size: 20px; letter-spacing:-0.2px}
  .section-head p{margin:0; color: var(--muted); font-size: 13px; max-width: 66ch}

  /* ===== Portfolio cards: whole card is a REAL link (no JS needed) ===== */
  .card-link{
    cursor: pointer;
    transition: transform 150ms ease, background 150ms ease, border-color 150ms ease;
    position: relative; /* needed for .card-hit */
  }
  .card-link:hover{
    transform: translateY(-2px);
    background: rgba(255,255,255,0.07);
    border-color: rgba(255,255,255,0.18);
  }
  .card-link:active{ transform: translateY(0); }

  /* Invisible anchor that covers the whole card */
  .card-link .card-hit{
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    z-index: 1;
  }
  /* Keep content/buttons above the hit area */
  .card-link > *:not(.card-hit){
    position: relative;
    z-index: 2;
  }
  /* Keyboard focus ring on the hit link */
  .card-link .card-hit:focus-visible{
    outline: 2px solid rgba(110,231,255,0.8);
    outline-offset: 3px;
  }

  .grid{display:grid; grid-template-columns: repeat(12, 1fr); gap: 14px;}
  .card{
    border:1px solid var(--line);
    background: rgba(255,255,255,0.05);
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: 0 12px 34px rgba(0,0,0,0.42);
  }

  .card h3{margin:0 0 6px; font-size: 15px}
  .card p{margin:0; color: var(--muted); font-size: 13px}

  .card .meta{margin-top: 12px; display:flex; gap: 8px; flex-wrap:wrap}
  .tag{font-family: var(--mono); font-size: 11px; color: rgba(255,255,255,0.72); border:1px solid rgba(255,255,255,0.12); background: rgba(255,255,255,0.04); padding: 6px 8px; border-radius: 999px;}

  .span-4{grid-column: span 4;}
  .span-5{grid-column: span 5;}
  .span-6{grid-column: span 6;}
  .span-7{grid-column: span 7;}
  .span-8{grid-column: span 8;}
  .span-12{grid-column: span 12;}

  .split{display:grid; grid-template-columns: 1fr 1fr; gap: 14px;}

  /* Portfolio / Labs details */
  details{border:1px solid rgba(255,255,255,0.10); background: rgba(255,255,255,0.04); border-radius: 16px; padding: 12px 14px;}
  summary{cursor:pointer; list-style:none; display:flex; align-items:center; justify-content:space-between; gap: 10px; font-weight: 700; font-size: 13px;}
  summary::-webkit-details-marker{display:none}
  .details-body{margin-top: 10px; color: var(--muted); font-size: 13px}
  .details-body ul{margin: 10px 0 0 18px}
  .details-body h4.case-title{
    margin: 0 0 8px;
    font-size: 14px;
    letter-spacing: 0.2px;
  }
  .details-body h5{
    margin: 14px 0 6px;
    font-size: 13px;
    opacity: 0.95;
  }
  .details-body .mono{
    font-family: var(--mono);
    font-size: 12.5px;
    opacity: 0.92;
  }
  .details-body .case-link a{
    border-bottom: 1px solid rgba(255,255,255,0.25);
  }
  .details-body .case-link a:hover{
    border-bottom-color: rgba(255,255,255,0.55);
  }

  /* YouTube embed */
  .video-wrap{
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.10);
    background: rgba(255,255,255,0.03);
  }
  .video-wrap iframe{
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
  }

  /* Screenshot strip */
  .shot-grid{
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
  }
  .shot-grid figure{
    margin: 0;
    border: 1px solid rgba(255,255,255,0.10);
    background: rgba(255,255,255,0.03);
    border-radius: 16px;
    overflow: hidden;
  }
  .shot-grid img{
    width: 100%;
    height: 140px;
    object-fit: cover;
    display: block;
  }
  .shot-grid figcaption{
    padding: 8px 10px;
    font-size: 12px;
    color: var(--muted2);
  }

  @media (max-width: 920px){
    .shot-grid{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
  }
  @media (max-width: 520px){
    .shot-grid{ grid-template-columns: 1fr; }
    .shot-grid img{ height: 170px; }
  }

  /* Contact */
  .form{display:grid; gap: 10px;}
  label{font-size: 12px; color: var(--muted2)}
  input, textarea{
    width:100%;
    padding: 12px 12px;
    border-radius: 14px;
    border: 1px solid rgba(255,255,255,0.12);
    background: rgba(0,0,0,0.28);
    color: var(--text);
    font-family: var(--sans);
    font-size: 13px;
  }
  textarea{min-height: 120px; resize: vertical}

  .footer{padding: 26px 0 44px; border-top: 1px solid var(--line); color: var(--muted2); font-size: 12px}
  .footer a{color: var(--muted)}
  .footer a:hover{color: var(--text)}
  .foot-row{display:flex; flex-wrap:wrap; gap: 12px; align-items:center; justify-content:space-between}

  /* Responsive */
  @media (max-width: 920px){
    .hero-grid{grid-template-columns: 1fr;}
    h1{font-size: 34px}
    .split{grid-template-columns: 1fr;}
    .span-4,.span-5,.span-6,.span-7,.span-8{grid-column: span 12;}
  }
  @media (max-width: 720px){
    .nav-links{display:none}
    .hamburger{display:inline-flex}
    .mobile-menu{display:none}
    .mobile-menu.open{display:block}
    .brand{min-width: auto}
    h1{font-size: 30px}
  }

  /* Reduce motion */
  @media (prefers-reduced-motion: reduce){
    *{scroll-behavior:auto}
    .btn{transition:none}
    .card-link{transition:none}
  }

/* ===== Square / rectangular theme override ===== */
.btn,
.pill,
.tag,
.card,
.hero-card,
.side-card,
.kpi .tile,
.logo,
input,
textarea,
details,
.nav-links a,
.mobile-menu a {
  border-radius: 0 !important;
}

/* Safari/iOS: prefixed backdrop blur */
.nav{ -webkit-backdrop-filter: blur(12px); }

/* Ensure menu actually becomes visible when JS toggles .open */
.mobile-menu.open{ display:block !important; }
.mobile-menu{ position: relative; z-index: 60; }

/* Mobile: prevent 3-line CTA labels (e.g., "Book a call" -> "Book" + "a call") */
@media (max-width: 520px){
  /* iOS can rasterize fixed backgrounds (looks blurry). Keep fixed on desktop; use scroll on mobile. */
  body{ background-attachment: scroll, scroll, scroll, scroll, scroll; }

  .nav .cta{ gap: 10px; }
  .nav .cta .btn{
    flex: 0 0 auto;
    text-align: center;
    line-height: 1.15;
    white-space: normal;
    word-break: keep-all;
    overflow-wrap: normal;
    hyphens: none;
  }
  /* Keep "View work" on exactly two lines, never breaking inside a word */
  .nav .cta a.btn[href$="#portfolio"],
  .nav .cta a.btn[href$="/#portfolio"]{
    width: 92px;
    max-width: 92px;
  }
  /* Keep "Book a call" on two lines (not 3) */
  .nav .cta a.btn.primary[href$="#contact"],
  .nav .cta a.btn.primary[href$="/#contact"]{
    width: 110px;
    max-width: 110px;
  }
  .nav .cta .hamburger{
    width: 46px;
    min-width: 46px;
    max-width: 46px;
    padding-left: 0;
    padding-right: 0;
  }
}

/* Prefer AVIF where supported (fallback is WebP in the main body background) */
@supports (background-image: image-set(url("x.webp") type("image/webp"))) {
  body {
    background:
      /* Image layer (4K) + gentle dark overlay for readability */
linear-gradient(180deg, rgba(11,12,16,0.52), rgba(11,12,16,0.72)),
      image-set(url("../assets/backgrounds/cortex_bg_01_4k.avif") type("image/avif"), url("../assets/backgrounds/cortex_bg_01_4k.webp") type("image/webp")) center/cover no-repeat fixed,
      radial-gradient(1000px 600px at 20% -10%, rgba(110,231,255,0.18), transparent 60%),
      radial-gradient(900px 600px at 90% 0%, rgba(167,139,250,0.16), transparent 60%),
      radial-gradient(700px 500px at 60% 90%, rgba(110,231,255,0.10), transparent 55%),
      var(--bg);
  }
}