/* ===================================================================
   GSM Apps, design tokens
   Palette: night RF console
   -------------------------------------------------------------- */
:root{
  --bg:        #0b1220;
  --bg-alt:    #0e1728;
  --surface:   #121c2e;
  --surface-2: #16223a;
  --line:      #24334c;
  --line-soft: #1a2740;
  --text:      #e8eef5;
  --text-dim:  #93a5bd;
  --text-mute: #7c90ac;
  --signal:    #3ddc97;
  --signal-dim:#1f5f47;
  --amber:     #ffb454;
  --red:       #ff6b6b;

  --font-display: 'JetBrains Mono', 'Space Mono', monospace;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --radius: 2px;
}

*{ box-sizing:border-box; margin:0; padding:0; }

html{ scroll-behavior:smooth; }

body{
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(ellipse 900px 500px at 15% -10%, rgba(61,220,151,0.06), transparent),
    radial-gradient(ellipse 700px 500px at 100% 10%, rgba(255,180,84,0.04), transparent);
  background-attachment:fixed;
}

a{ color:inherit; text-decoration:none; }

img{ max-width:100%; display:block; }

.wrap{
  max-width:1120px;
  margin:0 auto;
  padding:0 28px;
}

/* ---------- scanline / grid texture ---------- */
.grid-texture{
  position:fixed; inset:0; pointer-events:none; z-index:0;
  background-image:
    linear-gradient(rgba(140,160,190,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140,160,190,0.035) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(ellipse 1200px 800px at 50% 0%, black, transparent 70%);
}

/* ---------- header ---------- */
header.site{
  position:sticky; top:0; z-index:50;
  background:rgba(11,18,32,0.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line-soft);
}
.nav{
  position:relative;
  display:flex; align-items:center; justify-content:space-between;
  padding:18px 0;
}
.logo{
  display:flex; align-items:center; gap:10px;
  font-family:var(--font-display);
  font-size:15px; letter-spacing:0.02em;
  color:var(--text);
}
.logo .dot{
  width:9px; height:9px; border-radius:50%;
  background:var(--signal);
  box-shadow:0 0 8px 2px rgba(61,220,151,0.6);
  flex-shrink:0;
}
.logo b{ color:var(--signal); font-weight:600; }
.navlinks{ display:flex; gap:32px; }
.navlinks a{
  font-family:var(--font-display);
  font-size:12.5px;
  text-transform:uppercase;
  letter-spacing:0.08em;
  color:var(--text-dim);
  padding:6px 0;
  border-bottom:1px solid transparent;
  transition:color .15s, border-color .15s;
}
.navlinks a:hover, .navlinks a.active{
  color:var(--signal);
  border-color:var(--signal);
}

/* language switcher */
.lang-switch select{
  appearance:none;
  -webkit-appearance:none;
  background:transparent;
  border:1px solid var(--line);
  border-radius:var(--radius);
  color:var(--text-dim);
  font-family:var(--font-display);
  font-size:12px;
  letter-spacing:0.06em;
  padding:7px 26px 7px 10px;
  cursor:pointer;
  background-image:url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2393a5bd' stroke-width='2'%3e%3cpath d='M6 9l6 6 6-6'/%3e%3c/svg%3e");
  background-repeat:no-repeat;
  background-position:right 6px center;
  background-size:14px;
  transition:border-color .15s, color .15s;
}
.lang-switch select:hover, .lang-switch select:focus-visible{
  border-color:var(--signal);
  color:var(--text);
}
.lang-switch select option{
  background:var(--surface);
  color:var(--text);
}

@media (max-width:680px){
  .lang-switch{ padding:16px 28px; border-top:1px solid var(--line-soft); }
  .lang-switch select{ width:100%; }
}

/* mobile nav: pure-CSS checkbox toggle, no JS */
.nav-toggle-input{
  position:absolute; opacity:0; width:1px; height:1px; overflow:hidden;
}
.nav-toggle{ display:none; }

/* ---------- hero ---------- */
.hero{
  position:relative;
  padding:96px 0 72px;
  overflow:hidden;
  border-bottom:1px solid var(--line-soft);
}
.hero-grid{
  display:grid;
  grid-template-columns:1.1fr 0.9fr;
  gap:48px;
  align-items:center;
}
.eyebrow{
  font-family:var(--font-display);
  font-size:12.5px;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--amber);
  display:flex; align-items:center; gap:10px;
  margin-bottom:22px;
}
.eyebrow::before{
  content:''; width:20px; height:1px; background:var(--amber);
}
h1.hero-title{
  font-family:var(--font-display);
  font-size:clamp(34px, 5vw, 54px);
  line-height:1.08;
  letter-spacing:-0.01em;
  font-weight:600;
  color:var(--text);
  margin-bottom:22px;
}
h1.hero-title span{ color:var(--signal); }
.hero-sub{
  font-size:17px;
  color:var(--text-dim);
  max-width:46ch;
  margin-bottom:32px;
}
.cta-row{ display:flex; gap:14px; flex-wrap:wrap; }

.btn{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-display);
  font-size:13px; letter-spacing:0.04em;
  padding:13px 22px;
  border-radius:var(--radius);
  border:1px solid var(--line);
  transition:border-color .15s, background .15s, transform .1s;
}
.btn:active{ transform:translateY(1px); }
.btn-primary{
  background:var(--signal);
  color:#06140d;
  border-color:var(--signal);
  font-weight:600;
}
.btn-primary:hover{ background:#57e6ab; }
.btn-ghost{
  color:var(--text);
  background:transparent;
}
.btn-ghost:hover{ border-color:var(--signal); color:var(--signal); }

/* ---------- radar signature element ---------- */
.radar-wrap{
  position:relative;
  width:100%;
  aspect-ratio:1/1;
  max-width:420px;
  margin:0 auto;
  display:flex; align-items:center; justify-content:center;
}
.radar{
  position:relative;
  width:100%; height:100%;
  border-radius:50%;
  background:radial-gradient(circle, rgba(61,220,151,0.03), transparent 70%);
}
.radar-ring{
  position:absolute; border:1px solid var(--line);
  border-radius:50%;
  top:50%; left:50%;
  transform:translate(-50%,-50%);
}
.radar-ring.r1{ width:100%; height:100%; }
.radar-ring.r2{ width:74%; height:74%; }
.radar-ring.r3{ width:48%; height:48%; }
.radar-ring.r4{ width:22%; height:22%; border-color:var(--signal-dim); }
.radar-cross{
  position:absolute; top:50%; left:50%; transform:translate(-50%,-50%);
  width:100%; height:1px; background:var(--line-soft);
}
.radar-cross.v{ width:1px; height:100%; }
.radar-sweep{
  position:absolute; inset:0;
  border-radius:50%;
  background:conic-gradient(from 0deg, rgba(61,220,151,0.55), rgba(61,220,151,0) 32%);
  animation:sweep 4s linear infinite;
  mix-blend-mode:screen;
}
@keyframes sweep{ to{ transform:rotate(360deg); } }
.radar-blip{
  position:absolute; width:6px; height:6px; border-radius:50%;
  background:var(--amber);
  box-shadow:0 0 8px 2px rgba(255,180,84,0.7);
  animation:blip 3.2s ease-in-out infinite;
}
@keyframes blip{ 0%,100%{opacity:0;} 8%,20%{opacity:1;} 30%{opacity:0;} }
.radar-blip.b1{ top:28%; left:62%; animation-delay:.2s; }
.radar-blip.b2{ top:64%; left:32%; animation-delay:1.6s; }
.radar-blip.b3{ top:70%; left:68%; animation-delay:2.6s; }
.radar-label{
  position:absolute; font-family:var(--font-display);
  font-size:10.5px; color:var(--text-mute); letter-spacing:0.06em;
}
.radar-label.n{ top:0; left:50%; transform:translate(-50%, calc(-100% - 8px)); }
.radar-label.e{ top:50%; left:100%; transform:translate(8px, -50%); }
.radar-label.s{ bottom:0; left:50%; transform:translate(-50%, calc(100% + 8px)); }
.radar-label.w{ top:50%; right:100%; transform:translate(-8px, -50%); }

@media (prefers-reduced-motion: reduce){
  .radar-sweep{ animation:none; }
  .radar-blip{ animation:none; opacity:0.5; }
}

/* ---------- section ---------- */
.section{ padding:88px 0; }
.section-head{ margin-bottom:48px; }
.section-num{
  font-family:var(--font-display);
  font-size:12px; color:var(--text-mute); letter-spacing:0.1em;
  display:block; margin-bottom:10px;
}
.section-title{
  font-family:var(--font-display);
  font-size:clamp(24px,3vw,32px);
  font-weight:600;
}
.section-title .accent{ color:var(--signal); }
.section-sub{ color:var(--text-dim); margin-top:12px; max-width:56ch; }

/* ---------- app cards ---------- */
.apps-grid{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:24px;
}
.app-card{
  position:relative;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:28px 24px 26px;
  transition:border-color .18s, transform .18s;
  display:flex; flex-direction:column;
}
.app-card:hover{ border-color:var(--signal); transform:translateY(-3px); }
.app-card::before, .app-card::after{
  content:''; position:absolute; width:10px; height:10px;
  border-color:var(--line-soft); border-style:solid; border-width:0;
  transition:border-color .18s;
}
.app-card::before{ top:-1px; left:-1px; border-top-width:2px; border-left-width:2px; }
.app-card::after{ bottom:-1px; right:-1px; border-bottom-width:2px; border-right-width:2px; }
.app-card:hover::before, .app-card:hover::after{ border-color:var(--signal); }

.app-icon{
  width:44px; height:44px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  display:flex; align-items:center; justify-content:center;
  margin-bottom:20px;
  color:var(--signal);
}
.app-tag{
  font-family:var(--font-display);
  font-size:11px; color:var(--text-mute); letter-spacing:0.1em;
  text-transform:uppercase; margin-bottom:8px;
}
.app-card h3{
  font-family:var(--font-display);
  font-size:19px; margin-bottom:10px; font-weight:600;
}
.app-card p{ color:var(--text-dim); font-size:14.5px; flex-grow:1; margin-bottom:22px; }
.app-link{
  font-family:var(--font-display);
  font-size:12.5px; letter-spacing:0.05em;
  color:var(--signal);
  display:inline-flex; align-items:center; gap:6px;
}
.app-link .arrow{ transition:transform .15s; }
.app-card:hover .app-link .arrow{ transform:translateX(4px); }

/* ---------- specs strip ---------- */
.specs{
  display:grid; grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--line-soft);
  border-bottom:1px solid var(--line-soft);
}
.spec{
  padding:24px; border-right:1px solid var(--line-soft);
}
.spec:last-child{ border-right:none; }
.spec-val{
  font-family:var(--font-display); font-size:26px; color:var(--signal); font-weight:600;
}
.spec-label{ font-size:12.5px; color:var(--text-mute); margin-top:6px; text-transform:uppercase; letter-spacing:0.06em; }

/* ---------- contact ---------- */
.contact{
  border-top:1px solid var(--line-soft);
  padding:72px 0;
}
.contact-box{
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--surface);
  padding:40px;
  display:grid;
  grid-template-columns:1fr auto;
  align-items:center;
  gap:32px;
  position:relative;
}
.contact-box::before, .contact-box::after{
  content:''; position:absolute; width:10px; height:10px;
  border-color:var(--signal-dim); border-style:solid; border-width:0;
}
.contact-box::before{ top:-1px; left:-1px; border-top-width:2px; border-left-width:2px; }
.contact-box::after{ bottom:-1px; right:-1px; border-bottom-width:2px; border-right-width:2px; }
.contact-eyebrow{
  font-family:var(--font-display); font-size:11.5px; letter-spacing:0.1em;
  text-transform:uppercase; color:var(--amber); margin-bottom:10px;
}
.contact-box h2{
  font-family:var(--font-display); font-size:clamp(20px,2.4vw,26px);
  font-weight:600; margin-bottom:10px;
}
.contact-box p{ color:var(--text-dim); font-size:15px; max-width:52ch; }
.contact-actions{ display:flex; flex-direction:column; gap:10px; align-items:flex-start; }

@media (max-width:680px){
  .contact-box{ grid-template-columns:1fr; }
  .contact-actions{ align-items:stretch; }
  .contact-actions .btn{ justify-content:center; }
}

/* ---------- footer ---------- */
footer.site{
  border-top:1px solid var(--line-soft);
  padding:40px 0;
  color:var(--text-mute);
  font-size:13px;
}
.footer-row{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:16px; }
.footer-row .logo{ font-size:13px; }

/* ===================================================================
   App detail page
   -------------------------------------------------------------- */
.detail-hero{
  padding:64px 0 48px;
  border-bottom:1px solid var(--line-soft);
}
.breadcrumb{
  font-family:var(--font-display); font-size:12px; color:var(--text-mute);
  margin-bottom:28px; letter-spacing:0.04em;
}
.breadcrumb a{ color:var(--text-dim); }
.breadcrumb a:hover{ color:var(--signal); }
.detail-top{
  display:grid; grid-template-columns:1fr auto; gap:32px; align-items:flex-end;
}
.detail-title{
  font-family:var(--font-display); font-size:clamp(30px,4.5vw,46px);
  font-weight:600; letter-spacing:-0.01em;
}
.detail-tagline{ color:var(--text-dim); font-size:16.5px; margin-top:14px; max-width:52ch; }
.status-pill{
  font-family:var(--font-display); font-size:11.5px; letter-spacing:0.08em;
  text-transform:uppercase;
  border:1px solid var(--signal-dim); color:var(--signal);
  padding:7px 14px; border-radius:20px;
  display:flex; align-items:center; gap:8px; white-space:nowrap;
}
.status-pill .dot{ width:7px; height:7px; border-radius:50%; background:var(--signal); box-shadow:0 0 6px 1px rgba(61,220,151,.7); }

/* screenshot gallery */
.gallery{
  display:grid; grid-template-columns:repeat(3, 1fr); gap:20px;
}
.shot{
  border:1px solid var(--line);
  background:var(--surface);
  border-radius:var(--radius);
  aspect-ratio:9/17.5;
  overflow:hidden;
  position:relative;
}
.shot img{ width:100%; height:100%; object-fit:contain; }

/* real phone screenshots (1080x2424) get their own true ratio so nothing is cropped */
.gallery-scroll .shot{ aspect-ratio:1080/2424; }
.gallery-scroll .shot img{ object-fit:contain; }
.shot .placeholder{
  position:absolute; inset:0;
  display:flex; align-items:center; justify-content:center;
  flex-direction:column; gap:10px;
  color:var(--text-mute);
  font-family:var(--font-display); font-size:11px; letter-spacing:0.06em;
  text-align:center; padding:16px;
  background:
    repeating-linear-gradient(135deg, rgba(140,160,190,0.04) 0 2px, transparent 2px 14px);
}
.shot .placeholder svg{ opacity:0.5; }

/* scrollable gallery variant (used when there are more than 3 screenshots) */
.gallery-wrap{ position:relative; }
.gallery-scroll{
  display:flex;
  gap:20px;
  overflow-x:auto;
  scroll-snap-type:x proximity;
  scroll-behavior:smooth;
  padding:2px 2px 14px;
  margin:0 -2px;
  scrollbar-width:thin;
  scrollbar-color:var(--line) transparent;
}
.gallery-scroll::-webkit-scrollbar{ height:6px; }
.gallery-scroll::-webkit-scrollbar-thumb{ background:var(--line); border-radius:4px; }
.gallery-scroll::-webkit-scrollbar-track{ background:transparent; }
.gallery-scroll .shot{
  flex:0 0 auto;
  width:200px;
  scroll-snap-align:start;
  cursor:zoom-in;
  transition:border-color .15s;
}
.gallery-scroll .shot:hover, .gallery-scroll .shot:focus-visible{
  border-color:var(--signal);
}
.gallery-nav{
  position:absolute; top:calc(50% - 7px); translate:0 -50%;
  width:40px; height:40px;
  border-radius:50%;
  border:1px solid var(--line);
  background:rgba(11,18,32,0.9);
  backdrop-filter:blur(4px);
  color:var(--text);
  display:flex; align-items:center; justify-content:center;
  cursor:pointer;
  transition:border-color .15s, color .15s;
  z-index:2;
}
.gallery-nav:hover{ border-color:var(--signal); color:var(--signal); }
.gallery-nav.prev{ left:-20px; }
.gallery-nav.next{ right:-20px; }

@media (max-width:680px){
  .gallery-nav{ display:none; }
  .gallery-scroll .shot{ width:160px; }
}

/* ---------- animated app icons ---------- */
.title-icon{
  flex-shrink:0;
  width:36px; height:36px;
  border:1px solid var(--line);
  border-radius:var(--radius);
  display:flex; align-items:center; justify-content:center;
  color:var(--signal);
}
.title-row{ display:flex; align-items:center; gap:14px; }

/* drive test: signal waveform, marching dashes to read as "live" */
.icon-signal-path{
  stroke-dasharray:5 4;
  animation:signalTravel 1.1s linear infinite;
}
@keyframes signalTravel{ to{ stroke-dashoffset:-18; } }

/* azimut checker: compass needle oscillating like it's settling on a bearing */
.icon-needle{
  transform-box:fill-box;
  transform-origin:center;
  animation:needleSettle 2.6s ease-in-out infinite;
}
@keyframes needleSettle{
  0%, 100%{ transform:rotate(-10deg); }
  50%{ transform:rotate(10deg); }
}

/* coverage planner: trend line endpoints pulse like radar blips */
.icon-blip{
  transform-box:fill-box;
  transform-origin:center;
  animation:blipPulse 1.6s ease-in-out infinite;
}
.icon-blip.b2{ animation-delay:.5s; }
@keyframes blipPulse{
  0%, 100%{ opacity:0.5; transform:scale(1); }
  50%{ opacity:1; transform:scale(1.7); }
}

@media (prefers-reduced-motion: reduce){
  .icon-signal-path, .icon-needle, .icon-blip{ animation:none; }
}

/* lightbox */
.lightbox{
  display:none;
  position:fixed; inset:0; z-index:200;
  background:rgba(5,9,17,0.94);
  align-items:center; justify-content:center;
  padding:32px;
}
.lightbox.open{ display:flex; }
.lightbox img{
  max-width:min(90vw, 480px);
  max-height:86vh;
  width:auto; height:auto;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--surface);
}
.lightbox-close, .lightbox-nav{
  position:absolute;
  width:44px; height:44px;
  border-radius:50%;
  border:1px solid var(--line);
  background:rgba(11,18,32,0.9);
  color:var(--text);
  display:flex; align-items:center; justify-content:center;
  cursor:pointer;
  transition:border-color .15s, color .15s;
}
.lightbox-close:hover, .lightbox-nav:hover{ border-color:var(--signal); color:var(--signal); }
.lightbox-close{ top:24px; right:24px; }
.lightbox-nav.prev{ left:24px; top:50%; transform:translateY(-50%); }
.lightbox-nav.next{ right:24px; top:50%; transform:translateY(-50%); }

@media (max-width:680px){
  .lightbox-nav{ width:38px; height:38px; }
  .lightbox-nav.prev{ left:8px; }
  .lightbox-nav.next{ right:8px; }
  .lightbox-close{ top:12px; right:12px; }
}

/* feature list */
.feature-grid{ display:grid; grid-template-columns:repeat(2,1fr); gap:2px; background:var(--line-soft); border:1px solid var(--line-soft); }
.feature{ background:var(--bg); padding:26px 28px; }
.feature-num{ font-family:var(--font-display); font-size:12px; color:var(--amber); letter-spacing:0.08em; }
.feature h4{ font-family:var(--font-display); font-size:16px; margin:10px 0 8px; font-weight:600; }
.feature p{ color:var(--text-dim); font-size:14.5px; }

/* other apps nav */
.other-apps{ display:grid; grid-template-columns:repeat(2,1fr); gap:20px; }

@media (max-width: 860px){
  .hero-grid{ grid-template-columns:1fr; }
  .radar-wrap{ order:-1; width:min(220px, 60vw); max-width:220px; }
  .apps-grid{ grid-template-columns:1fr; }
  .specs{ grid-template-columns:repeat(2,1fr); }
  .spec:nth-child(2){ border-right:none; }
  .gallery{ grid-template-columns:repeat(2,1fr); }
  .detail-top{ grid-template-columns:1fr; align-items:flex-start; }
  .feature-grid{ grid-template-columns:1fr; }
  .other-apps{ grid-template-columns:1fr; }
}

@media (max-width: 680px){
  .nav-toggle{
    display:flex; flex-direction:column; justify-content:center; gap:5px;
    width:32px; height:32px; cursor:pointer;
  }
  .nav-toggle span{
    display:block; height:2px; width:100%; background:var(--text);
    transition:transform .2s, opacity .2s;
  }
  .nav-toggle-input:focus-visible + .nav-toggle{
    outline:2px solid var(--signal); outline-offset:3px;
  }
  .navlinks{
    position:absolute; top:100%; left:0; right:0;
    flex-direction:column; gap:0;
    background:var(--bg-alt);
    border-bottom:1px solid var(--line-soft);
    max-height:0; overflow:hidden;
    transition:max-height .25s ease;
  }
  .navlinks a{
    padding:16px 28px;
    border-bottom:1px solid var(--line-soft);
    font-size:13px;
  }
  .navlinks a:last-child{ border-bottom:none; }
  .nav-toggle-input:checked ~ .navlinks{ max-height:320px; }
  .nav-toggle-input:checked ~ .nav-toggle span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
  .nav-toggle-input:checked ~ .nav-toggle span:nth-child(2){ opacity:0; }
  .nav-toggle-input:checked ~ .nav-toggle span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }
}

@media (max-width:520px){
  .gallery{ grid-template-columns:1fr; }
}

:focus-visible{
  outline:2px solid var(--signal);
  outline-offset:3px;
}