/* BIAN Futurist – main styles */
:root {
  --bg: #000;
  --text: #d9e2ff;
  --muted: #8aa0c2;
  --accent1: #00e1ff;
  --accent2: #00ff9a;
  --ring: rgba(0, 225, 255, 0.55);
  --header-h: 72px; /* brand(40) + vertical padding(16*2) */
}

html, body { height: 100%; }
body.bian {
  background: var(--bg);
  color: var(--text);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, 'Helvetica Neue', Arial, 'Noto Sans', 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.container { width: min(1100px, 92vw); margin-inline: auto; }

/* Starfield canvas layers */
#stars::before, #stars::after { content: ""; position: fixed; inset: 0; z-index: -2; pointer-events: none; }
#stars::before { background: radial-gradient(1000px 1000px at 10% 20%, rgba(0,255,170,.08), transparent 60%), radial-gradient(900px 900px at 80% 10%, rgba(0,200,255,.08), transparent 60%); filter: blur(10px); }
#stars::after { background-image: radial-gradient(2px 2px at 20% 30%, rgba(255,255,255,.6), transparent), radial-gradient(1px 1px at 60% 70%, rgba(255,255,255,.35), transparent), radial-gradient(1px 1px at 80% 40%, rgba(255,255,255,.25), transparent); animation: twinkle 6s linear infinite; }
@keyframes twinkle { 50% { opacity: .7; } }

/* Header */
.site-header { position: sticky; top: 0; backdrop-filter: blur(10px); background: rgba(0,0,0,.55); border-bottom: 1px solid rgba(255,255,255,.06); z-index: 10; }
.site-header .container { display: flex; align-items: center; justify-content: space-between; padding: 16px 0; }
.brand img { height: 40px; width: auto; filter: drop-shadow(0 0 12px rgba(0, 225, 255, .25)); }
.wordmark { font-family: Orbitron, Inter, sans-serif; font-weight: 700; letter-spacing: .08em; font-size: 1.3rem; background: linear-gradient(90deg, var(--accent1), var(--accent2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nav-toggle { display: none; width: 44px; height: 36px; border: 1px solid rgba(255,255,255,.14); border-radius: 10px; background: rgba(255,255,255,.02); align-items: center; justify-content: center; gap: 5px; }
.nav-toggle span { width: 20px; height: 2px; background: linear-gradient(90deg, var(--accent1), var(--accent2)); display: block; }
.site-nav { display: block; }
.menu { display: flex; gap: 22px; list-style: none; margin: 0; padding: 0; align-items: center; }
.menu a { color: var(--text); text-decoration: none; opacity: .9; }
.menu a:hover { color: #fff; text-shadow: 0 0 18px rgba(0,225,255,.4); }

@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; }
  .site-nav { position: fixed; top: var(--header-h); left: 0; right: 0; background: rgba(0,0,0,.78); backdrop-filter: blur(14px); border-top: 1px solid rgba(255,255,255,.06); transform: translateY(-108%); transition: transform .28s cubic-bezier(.4,.1,.2,1); padding-bottom: 20px; box-shadow: 0 18px 34px -8px rgba(0,0,0,.55); }
  .site-nav.open { transform: translateY(0); }
  .menu { flex-direction: column; padding: 18px 22px 4px; gap: 4px; align-items: stretch; width: 100%; }
  .menu li { width: 100%; }
  .menu a { display: block; width: 100%; padding: 12px 4px 14px; font-size: 1.05rem; letter-spacing: .05em; border-radius: 10px; position: relative; }
  .menu a:active { background: linear-gradient(90deg, rgba(0,225,255,.15), rgba(0,255,154,.15)); }
}
@media (max-width: 1024px) {
  .site-header, .site-nav { display: none !important; }
  .hero { padding-top: 48px; }
}

/* Hero */
.hero { padding: 80px 0 20px; text-align: center; }
.hero .logo { width: 120px; height: 120px; border-radius: 999px; box-shadow: 0 0 0 2px rgba(255,255,255,.08), 0 0 30px rgba(0,225,255,.25) inset; margin: 0 auto 18px; background: radial-gradient(circle at 30% 20%, #29c5ff, #00d4ff 35%, #00ffa7 100%); display: grid; place-items: center; }
.hero .brand-title { font-family: Orbitron, Inter, sans-serif; font-weight: 700; letter-spacing: .14em; font-size: clamp(2rem, 4vw + 1rem, 3rem); margin: 0 0 8px; }
.hero .tagline { color: var(--muted); font-size: 1.05rem; margin: 0 auto; max-width: 780px; }

/* Apps section */
.apps { padding: 40px 0 72px; }
.section-title { text-align: center; margin: 10px 0 28px; font-family: Orbitron, Inter, sans-serif; letter-spacing: .12em; opacity: .95; }
.app-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.app-card { backdrop-filter: blur(6px); }
.app-card { background: rgba(255,255,255,.02); border: 1px solid rgba(255,255,255,.06); border-radius: 16px; padding: 18px; position: relative; overflow: hidden; }
.app-card::after { content: ""; position: absolute; inset: -1px; border-radius: 16px; padding: 1px; background: linear-gradient(135deg, rgba(0,225,255,.45), rgba(0,255,154,.45)); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude; pointer-events: none; opacity: .25;
}
.app-header { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.app-icon { width: 48px; height: 48px; border-radius: 12px; background: radial-gradient(circle at 30% 20%, #29c5ff, #00d4ff 35%, #00ffa7 100%); box-shadow: 0 0 0 1px rgba(255,255,255,.08) inset; }
.app-icon-img { width: 48px; height: 48px; border-radius: 12px; border: 1px solid rgba(255,255,255,.08); object-fit: contain; background: #0a0f14; padding: 4px; }
.app-title { font-weight: 700; letter-spacing: .06em; }
.app-sub { color: var(--muted); font-size: .95rem; }
.app-desc { color: #c7d5f2; font-size: .98rem; margin: 6px 0 12px; }

.cta-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.btn { --g1: var(--accent1); --g2: var(--accent2); border: 1px solid rgba(255,255,255,.1); color: #0b0f14; font-weight: 600; background: linear-gradient(90deg, var(--g1), var(--g2)); padding: 10px 14px; border-radius: 10px; text-decoration: none; box-shadow: 0 6px 20px rgba(0, 235, 200, .15); }
.btn.secondary { background: transparent; color: var(--text); border-color: rgba(255,255,255,.16); }
.btn:hover { filter: brightness(1.07); box-shadow: 0 8px 26px rgba(0, 235, 200, .25); }

/* Carousel */
.carousel { display: grid; grid-auto-flow: column; grid-auto-columns: 80%; gap: 12px; overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 6px; }
.carousel img { width: 100%; height: auto; border-radius: 12px; border: 1px solid rgba(255,255,255,.08); scroll-snap-align: center; }

/* Futuristic holographic stack (crossfade, not a slider) */
.holo-stack {
  --count: 4;          /* number of images (overridden inline) */
  --step: 3.5s;        /* time each image stays (overridden inline) */
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: 12px;
  overflow: hidden;
  background: rgba(255,255,255,.02);
  border: 1px solid rgba(255,255,255,.06);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.3), 0 10px 30px rgba(0, 235, 200, .05);
}
.holo-stack::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,.0), rgba(0,255,200,.05), rgba(0,0,0,.0));
  mix-blend-mode: screen; pointer-events: none;
}
.holo-stack::after {
  content: "";
  position: absolute; inset: -1px; border-radius: 12px; padding: 1px;
  background: linear-gradient(135deg, rgba(0,225,255,.35), rgba(0,255,154,.35));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; pointer-events: none; opacity: .25;
}
.holo-stack img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  opacity: 0; filter: saturate(1.1) contrast(1.05) brightness(1.02);
  animation: holoFade calc(var(--count) * var(--step)) linear infinite;
  animation-delay: calc(var(--i) * var(--step));
}
@media (prefers-reduced-motion: reduce) {
  .holo-stack img, .holo-panel img { animation: none; opacity: 1; }
}
/* Non-cropping mode */
.holo-stack.contain { background: rgba(4,8,12,.6); }
.holo-stack.contain img { object-fit: contain; padding: 6px; background: radial-gradient(120% 100% at 50% 0%, rgba(0,255,200,.03), transparent 60%); }
@keyframes holoFade {
  0% { opacity: 1; transform: scale(1.0); }
  20% { opacity: 1; transform: scale(1.0); }
  24% { opacity: 0; }
  100% { opacity: 0; }
}

/* Duo layout: show two images at once (even/odd streams) */
.holo-stack.duo { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; aspect-ratio: auto; }
.holo-panel { position: relative; border-radius: 12px; overflow: hidden; background: rgba(255,255,255,.02); border: 1px solid rgba(255,255,255,.06); }
.holo-panel::after { content: ""; position: absolute; inset: -1px; border-radius: 12px; padding: 1px; background: linear-gradient(135deg, rgba(0,225,255,.35), rgba(0,255,154,.35)); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude; pointer-events:none; opacity:.25; }
.holo-panel img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; padding: 6px; background: radial-gradient(120% 100% at 50% 0%, rgba(0,255,200,.03), transparent 60%); opacity:0; filter: saturate(1.05) contrast(1.03) brightness(1.01); animation: holoFade calc(var(--count) * var(--step)) linear infinite; animation-delay: calc(var(--i) * var(--step)); }

/* Footer */
.site-footer { padding: 40px 0; color: var(--muted); text-align: center; border-top: 1px solid rgba(255,255,255,.06); background: rgba(0,0,0,.6); }

/* Responsive tweaks */
@media (min-width: 900px) {
  .carousel { grid-auto-columns: 33%; }
}

/* Fluid typography & spacing for better device fit */
@media (max-width: 600px) {
  .hero { padding-top: 64px; }
  .hero .brand-title { font-size: clamp(1.8rem, 5vw + .8rem, 2.2rem); }
  .section-title { font-size: 1.1rem; }
  .app-card { padding: 14px; }
}

/* Fancy accent glow on interactive elements */
.btn:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(0,255,200,.14), 0 0 24px rgba(0,255,200,.2); }
.app-card:hover { box-shadow: 0 14px 40px rgba(0, 235, 200, .08); }

/* More details block */
.more-block { margin-top: 14px; background: rgba(255,255,255,.02); border: 1px solid rgba(255,255,255,.06); border-radius: 12px; padding: 12px 14px; }
.more-block > summary { cursor: pointer; font-weight: 600; letter-spacing: .04em; color: #dff; }
.more-block[open] > summary { margin-bottom: 8px; }
.more-block h4 { margin: 10px 0 6px; font-weight: 700; letter-spacing: .06em; color: #dff; }
.bullets { margin: 0; padding-left: 18px; color: #c7d5f2; }
.bullets li { margin: 4px 0; }

/* Modal & Contact form */
.modal[hidden] { display: none; }
.modal { position: fixed; inset: 0; display: grid; place-items: center; z-index: 50; background: rgba(0,0,0,.2); }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,.6); backdrop-filter: blur(6px); z-index: 0; }
.modal-card { position: relative; width: min(680px, 92vw); border-radius: 16px; background: rgba(6,12,18,.9); border: 1px solid rgba(255,255,255,.08); box-shadow: 0 10px 40px rgba(0,0,0,.45); padding: 18px; z-index: 1; }
.modal-card { max-height: 86vh; overflow: auto; }
.modal-card::after { content: ""; position: absolute; inset: -1px; border-radius: 16px; padding: 1px; background: linear-gradient(135deg, rgba(0,225,255,.45), rgba(0,255,154,.45)); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude; pointer-events: none; opacity: .25; }
.modal-card h3 { margin: 6px 0 8px; font-family: Orbitron, Inter, sans-serif; letter-spacing: .08em; }
.modal-card p { margin: 0 0 10px; color: #cfe9ff; }
.contact-form { display: grid; gap: 10px; }
.contact-form .row { display: grid; gap: 10px; grid-template-columns: 1fr; }
@media (min-width: 620px) { .contact-form .row { grid-template-columns: 1fr 1fr; } }
.contact-form input, .contact-form textarea { background: rgba(10,16,22,.85); border: 1px solid rgba(255,255,255,.12); border-radius: 10px; color: #e9f6ff; padding: 10px 12px; outline: none; }
.contact-form input, .contact-form textarea, .contact-form select { background: rgba(10,16,22,.85); border: 1px solid rgba(255,255,255,.12); border-radius: 10px; color: #e9f6ff; padding: 10px 12px; outline: none; }
.contact-form input:focus, .contact-form textarea:focus { border-color: rgba(0,255,200,.35); box-shadow: 0 0 0 3px rgba(0,255,200,.08); }
.contact-form input:focus, .contact-form textarea:focus, .contact-form select:focus { border-color: rgba(0,255,200,.35); box-shadow: 0 0 0 3px rgba(0,255,200,.08); }
.contact-form input + input { margin-top: 0; }
.contact-form textarea { margin-top: 2px; }
.contact-form button { min-height: 42px; }
.contact-form input:focus, .contact-form textarea:focus { border-color: rgba(0,255,200,.35); box-shadow: 0 0 0 3px rgba(0,255,200,.08); }
.form-status { margin-top: 6px; min-height: 20px; font-size: .95rem; color: #cff; }