/* ============================================================
   VOJTECH.INFO — Stylesheet
   Dark Mode · Mobile First · CSS Grid/Flexbox · Animations
   ============================================================ */

/* ---------- Custom Properties ---------- */
:root {
  /* Backgrounds */
  --bg-deep:    #070710;
  --bg-primary: #0a0a1a;
  --bg-surface: #10102a;
  --bg-card:    #15153a;
  --bg-elevated:#1c1c48;
  --bg-input:   #0e0e24;

  /* Text */
  --text-primary:   #e8ecf4;
  --text-secondary: #a0aec0;
  --text-muted:     #64748b;
  --text-inverse:   #070710;

  /* Accents */
  --accent-cyan:    #00d4ff;
  --accent-purple:  #a855f7;
  --accent-purple-2:#7c3aed;
  --accent-green:   #10b981;

  /* Gradients */
  --gradient-cyan:   linear-gradient(135deg, #00d4ff, #06b6d4);
  --gradient-purple: linear-gradient(135deg, #a855f7, #7c3aed);
  --gradient-mixed:  linear-gradient(135deg, #00d4ff, #a855f7);

  /* Shadows */
  --shadow-sm:   0 1px 3px rgba(0,0,0,.4);
  --shadow-md:   0 4px 14px rgba(0,0,0,.5);
  --shadow-lg:   0 8px 32px rgba(0,0,0,.6);
  --shadow-glow-cyan:   0 0 40px rgba(0,212,255,.15);
  --shadow-glow-purple: 0 0 40px rgba(168,85,247,.15);

  /* Borders */
  --border-color: rgba(255,255,255,.06);
  --border-glow:  rgba(255,255,255,.1);

  /* Spacing */
  --nav-h: 72px;
  --section-gap: clamp(4rem, 10vh, 7rem);
  --container-max: 1200px;
  --container-pad: clamp(1rem, 5vw, 2.5rem);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Transitions */
  --ease-out: cubic-bezier(.16,1,.3,1);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);
  --dur-fast: 150ms;
  --dur-normal: 300ms;
  --dur-slow: 600ms;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* ---------- Reset & Base ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:var(--nav-h)}
body{
  font-family:var(--font-sans);
  background:var(--bg-deep);
  color:var(--text-primary);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{cursor:pointer;border:none;background:none;font:inherit;color:inherit}

::selection{background:rgba(0,212,255,.3);color:#fff}

:focus-visible{
  outline:2px solid var(--accent-cyan);
  outline-offset:3px;
  border-radius:4px;
}

/* ---------- Utility ---------- */
.container{
  max-width:var(--container-max);
  margin:0 auto;
  padding:0 var(--container-pad);
}
.text-gradient{background:var(--gradient-cyan);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.text-gradient-2{background:var(--gradient-purple);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

/* ---------- Reveal Animation ---------- */
.reveal{
  opacity:0;
  transform:translateY(28px);
  transition:opacity .7s var(--ease-out),transform .7s var(--ease-out);
}
.reveal.visible{
  opacity:1;
  transform:translateY(0);
}
.reveal:nth-child(2){transition-delay:.1s}
.reveal:nth-child(3){transition-delay:.2s}
.reveal:nth-child(4){transition-delay:.3s}
.reveal:nth-child(5){transition-delay:.4s}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:14px 28px;
  border-radius:var(--radius-md);
  font-weight:600;
  font-size:.95rem;
  transition:all var(--dur-normal) var(--ease-out);
  white-space:nowrap;
}
.btn-primary{
  background:var(--gradient-cyan);
  color:var(--text-inverse);
  box-shadow:0 4px 20px rgba(0,212,255,.3);
}
.btn-primary:hover{
  box-shadow:0 6px 30px rgba(0,212,255,.5);
  transform:translateY(-2px);
}
.btn-primary:active{transform:translateY(0)}

.btn-secondary{
  background:transparent;
  color:var(--text-primary);
  border:1px solid var(--border-glow);
}
.btn-secondary:hover{
  border-color:var(--accent-cyan);
  background:rgba(0,212,255,.06);
  transform:translateY(-2px);
}
.btn-secondary:active{transform:translateY(0)}

/* ---------- Section Titles ---------- */
.section-title{
  font-size:clamp(1.8rem,4vw,2.6rem);
  font-weight:800;
  letter-spacing:-.02em;
  margin-bottom:1.5rem;
  color:var(--text-primary);
}
.section-number{
  display:block;
  font-family:var(--font-mono);
  font-size:.8rem;
  font-weight:500;
  color:var(--accent-cyan);
  letter-spacing:.15em;
  margin-bottom:.5rem;
  text-transform:uppercase;
}
.section-intro{
  color:var(--text-secondary);
  font-size:1.1rem;
  max-width:600px;
  margin-bottom:3rem;
  line-height:1.8;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:1000;
  height:var(--nav-h);
  background:rgba(7,7,16,.85);
  backdrop-filter:blur(16px) saturate(180%);
  -webkit-backdrop-filter:blur(16px) saturate(180%);
  border-bottom:1px solid var(--border-color);
  transition:background var(--dur-normal);
}
.nav-container{
  max-width:var(--container-max);
  margin:0 auto;
  padding:0 var(--container-pad);
  height:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
}

/* Logo */
.nav-logo{
  display:flex;
  align-items:center;
  gap:2px;
  font-size:1.4rem;
  font-weight:900;
  font-family:var(--font-mono);
  letter-spacing:-.03em;
  transition:opacity var(--dur-fast);
}
.nav-logo:hover{opacity:.8}
.logo-bracket{color:var(--accent-cyan)}
.logo-text{background:var(--gradient-cyan);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

/* Desktop Links */
.nav-links{display:flex;align-items:center;gap:2rem}
.nav-link{
  font-size:.9rem;
  font-weight:500;
  color:var(--text-secondary);
  transition:color var(--dur-fast);
  position:relative;
}
.nav-link::after{
  content:'';
  position:absolute;
  bottom:-4px;left:0;
  width:0;height:2px;
  background:var(--accent-cyan);
  transition:width var(--dur-normal) var(--ease-out);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--text-primary)}
.nav-link:hover::after,.nav-link:focus-visible::after{width:100%}
.nav-cta-link{
  padding:8px 20px;
  background:var(--gradient-cyan);
  color:var(--text-inverse)!important;
  border-radius:var(--radius-sm);
  font-weight:600;
  transition:box-shadow var(--dur-normal),transform var(--dur-normal);
}
.nav-cta-link:hover{box-shadow:0 4px 18px rgba(0,212,255,.4);transform:translateY(-1px)}
.nav-cta-link::after{display:none}

/* Hamburger */
.nav-toggle{
  display:none;
  flex-direction:column;
  gap:5px;
  padding:8px;
  z-index:1001;
}
.hamburger-line{
  display:block;
  width:24px;height:2px;
  background:var(--text-primary);
  border-radius:2px;
  transition:all var(--dur-normal) var(--ease-out);
  transform-origin:center;
}
.nav-toggle.active .hamburger-line:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.active .hamburger-line:nth-child(2){opacity:0;transform:scaleX(0)}
.nav-toggle.active .hamburger-line:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* Drawer */
.nav-drawer{
  display:none;
  position:fixed;
  top:var(--nav-h);left:0;right:0;
  background:rgba(15,15,40,.97);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--border-color);
  box-shadow:0 12px 40px rgba(0,0,0,.5);
  padding:1.5rem var(--container-pad);
  flex-direction:column;
  gap:.75rem;
  z-index:999;
  transform:translateY(-8px);
  opacity:0;
  transition:all var(--dur-normal) var(--ease-out);
}
.nav-drawer.open{
  display:flex;
  transform:translateY(0);
  opacity:1;
}
.nav-drawer-link{
  font-size:1.1rem;
  font-weight:500;
  color:var(--text-secondary);
  padding:.75rem 0;
  background:rgba(15,15,40,.97);  /* explicit bg — prevents mobile bleed-through */
  transition:color var(--dur-fast);
}
.nav-drawer-link:active{background:rgba(168,85,247,.1)}
.nav-drawer-link:hover{color:var(--accent-cyan)}
.nav-drawer-cta{
  color:var(--accent-cyan)!important;
  font-weight:700;
}

/* ============================================================
   HERO
   ============================================================ */
.hero{
  position:relative;
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  overflow:hidden;
  padding:calc(var(--nav-h) + 2rem) var(--container-pad) 4rem;
}

/* Background grid */
.hero-bg-grid{
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(0,212,255,.03) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,212,255,.03) 1px,transparent 1px);
  background-size:60px 60px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 40%,black 30%,transparent 70%);
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 40%,black 30%,transparent 70%);
}

/* Glow orbs */
.hero-glow{
  position:absolute;
  width:500px;height:500px;
  border-radius:50%;
  filter:blur(120px);
  opacity:.12;
  pointer-events:none;
}
.hero-glow--left{
  top:-20%;left:-15%;
  background:var(--accent-cyan);
  animation:floatGlow 8s ease-in-out infinite;
}
.hero-glow--right{
  bottom:-20%;right:-15%;
  background:var(--accent-purple);
  animation:floatGlow 8s ease-in-out 4s infinite;
}
@keyframes floatGlow{
  0%,100%{transform:translate(0,0) scale(1)}
  33%{transform:translate(30px,-30px) scale(1.1)}
  66%{transform:translate(-20px,20px) scale(.95)}
}

/* Content */
.hero-content{
  position:relative;
  max-width:780px;
  text-align:center;
  z-index:2;
}
.hero-eyebrow{
  font-family:var(--font-mono);
  font-size:.8rem;
  font-weight:500;
  color:var(--accent-cyan);
  letter-spacing:.2em;
  text-transform:uppercase;
  margin-bottom:clamp(1rem,3vh,2rem);
}
.hero-title{
  font-size:clamp(2.4rem,7vw,4.2rem);
  font-weight:900;
  line-height:1.1;
  letter-spacing:-.03em;
  margin-bottom:clamp(1rem,2.5vh,1.5rem);
}
.hero-subtitle{
  font-size:clamp(1rem,2vw,1.2rem);
  color:var(--text-secondary);
  max-width:600px;
  margin:0 auto clamp(2rem,4vh,2.5rem);
  line-height:1.8;
}
.hero-actions{
  display:flex;
  gap:1rem;
  justify-content:center;
  flex-wrap:wrap;
}

/* Hero image overlay */
.hero::after{
  content:'';
  position:absolute;inset:0;
  background:url('/images/hero-bg.png') center/cover no-repeat;
  opacity:.12;
  z-index:0;
  pointer-events:none;
}
.hero-scroll{
  position:absolute;
  bottom:2rem;
  left:50%;
  transform:translateX(-50%);
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:8px;
  opacity:.5;
  animation:scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse{
  0%,100%{opacity:.3;transform:translateX(-50%) translateY(0)}
  50%{opacity:.7;transform:translateX(-50%) translateY(6px)}
}
.scroll-text{
  font-family:var(--font-mono);
  font-size:.65rem;
  letter-spacing:.25em;
  text-transform:uppercase;
  color:var(--text-muted);
}
.scroll-line{
  width:1px;height:40px;
  background:linear-gradient(to bottom,var(--accent-cyan),transparent);
}

/* ============================================================
   ABOUT
   ============================================================ */
.about{
  padding:var(--section-gap) 0;
  background:var(--bg-primary);
  position:relative;
}
.about::before{
  content:'';
  position:absolute;inset:0;
  background:url('/images/network-bg.png') right center/50% auto no-repeat;
  opacity:.06;
  pointer-events:none;
}
.about-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:1.5rem;
}
.about-card{
  background:var(--bg-surface);
  border:1px solid var(--border-color);
  border-radius:var(--radius-lg);
  padding:2rem;
  transition:border-color var(--dur-normal),box-shadow var(--dur-normal);
  position:relative;
  overflow:hidden;
}
.about-card::before{
  content:'';
  position:absolute;
  top:0;left:0;right:0;
  height:3px;
  background:var(--gradient-mixed);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform var(--dur-slow) var(--ease-out);
}
.about-card:hover{border-color:rgba(0,212,255,.2);box-shadow:var(--shadow-glow-cyan)}
.about-card:hover::before{transform:scaleX(1)}

.about-icon{
  width:56px;height:56px;
  border-radius:var(--radius-md);
  background:rgba(0,212,255,.08);
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--accent-cyan);
  margin-bottom:1.25rem;
}
.about-card h3{
  font-size:1.15rem;
  font-weight:700;
  margin-bottom:.75rem;
  color:var(--text-primary);
}
.about-card p{
  color:var(--text-secondary);
  font-size:.95rem;
  line-height:1.75;
}

/* ============================================================
   SERVICES
   ============================================================ */
.services{
  padding:var(--section-gap) 0;
  background:var(--bg-deep);
  position:relative;
}
.services::before{
  content:'';
  position:absolute;inset:0;
  background:url('/images/device-bg.png') left bottom/45% auto no-repeat;
  opacity:.06;
  pointer-events:none;
}
.service-pillars{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(320px,1fr));
  gap:1.5rem;
}
.service-pillar{
  background:var(--bg-surface);
  border:1px solid var(--border-color);
  border-radius:var(--radius-lg);
  overflow:hidden;
  transition:border-color var(--dur-normal),box-shadow var(--dur-normal);
}
.service-pillar:hover{
  border-color:rgba(0,212,255,.15);
  box-shadow:var(--shadow-glow-cyan);
}

/* Pillar headers */
.pillar-header{
  padding:2rem 2rem 1.5rem;
  display:flex;
  align-items:center;
  gap:1rem;
}
.pillar-header h3{
  font-size:1.25rem;
  font-weight:700;
  line-height:1.3;
}
.pillar-icon{
  width:56px;height:56px;
  border-radius:var(--radius-md);
  display:flex;
  align-items:center;
  justify-content:center;
  flex-shrink:0;
}
.pillar-security .pillar-icon{background:rgba(0,212,255,.1);color:var(--accent-cyan)}
.pillar-virtual  .pillar-icon{background:rgba(168,85,247,.1);color:var(--accent-purple)}
.pillar-ai       .pillar-icon{background:rgba(16,185,129,.1);color:var(--accent-green)}

/* Pillar lists */
.pillar-list{
  padding:0 2rem 2rem;
  display:flex;
  flex-direction:column;
  gap:1rem;
}
.pillar-list li{
  display:flex;
  gap:.75rem;
}
.pillar-bullet{
  flex-shrink:0;
  width:8px;height:8px;
  border-radius:50%;
  background:var(--accent-cyan);
  margin-top:.55rem;
}
.bullet-virtual{background:var(--accent-purple)}
.bullet-ai{background:var(--accent-green)}

.pillar-list li strong{
  display:block;
  font-size:.92rem;
  font-weight:600;
  color:var(--text-primary);
  margin-bottom:2px;
}
.pillar-list li p{
  font-size:.85rem;
  color:var(--text-secondary);
  line-height:1.65;
}

/* ============================================================
   TECH STACK
   ============================================================ */
.tech-stack{
  padding:var(--section-gap) 0;
  background:var(--bg-primary);
}
.tech-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:1.25rem;
}
.tech-item{
  display:flex;
  flex-direction:column;
  gap:.5rem;
}
.tech-name{
  font-size:.85rem;
  font-weight:600;
  color:var(--text-secondary);
  font-family:var(--font-mono);
  font-size:.8rem;
}
.tech-bar{
  width:100%;
  height:6px;
  background:rgba(255,255,255,.05);
  border-radius:3px;
  overflow:hidden;
}
.tech-fill{
  height:100%;
  border-radius:3px;
  width:var(--w);
  background:var(--gradient-mixed);
  transform-origin:left;
  transition:transform 1s var(--ease-out);
}
.tech-fill.animated{animation:fillBar 1.2s var(--ease-out) forwards}
@keyframes fillBar{
  from{transform:scaleX(0)}
  to{transform:scaleX(1)}
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact{
  padding:var(--section-gap) 0;
  background:var(--bg-deep);
}
.contact-grid{
  display:grid;
  grid-template-columns:1fr 1.2fr;
  gap:3rem;
  align-items:start;
}
.contact-lead{
  font-size:1.15rem;
  color:var(--text-secondary);
  line-height:1.8;
  margin-bottom:2rem;
}
.contact-link{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:12px 24px;
  border-radius:var(--radius-md);
  font-weight:600;
  font-size:.9rem;
  background:var(--bg-surface);
  border:1px solid var(--border-color);
  transition:all var(--dur-normal);
}
.contact-link:hover{border-color:var(--accent-cyan);box-shadow:var(--shadow-glow-cyan)}
.contact-link--linkedin{color:#0a66c2}

/* Form */
.contact-form{
  background:var(--bg-surface);
  border:1px solid var(--border-color);
  border-radius:var(--radius-lg);
  padding:2rem;
  display:flex;
  flex-direction:column;
  gap:1.25rem;
}
.form-group{display:flex;flex-direction:column;gap:.35rem}
.form-label{
  font-size:.8rem;
  font-weight:600;
  color:var(--text-secondary);
  text-transform:uppercase;
  letter-spacing:.06em;
}
.form-input{
  background:var(--bg-input);
  border:1px solid var(--border-color);
  border-radius:var(--radius-sm);
  padding:12px 16px;
  font-size:.95rem;
  font-family:inherit;
  color:var(--text-primary);
  transition:border-color var(--dur-fast),box-shadow var(--dur-fast);
}
.form-input::placeholder{color:var(--text-muted)}
.form-input:focus{
  outline:none;
  border-color:var(--accent-cyan);
  box-shadow:0 0 0 3px rgba(0,212,255,.15);
}
.form-input.error{border-color:#ef4444;box-shadow:0 0 0 3px rgba(239,68,68,.15)}
.form-textarea{resize:vertical;min-height:120px}
.form-error{
  font-size:.75rem;
  color:#ef4444;
  min-height:1.2em;
}

.btn-submit{
  position:relative;
  justify-content:center;
  width:100%;
}
.btn-submit .btn-spinner{display:none}
.btn-submit.loading .btn-text{opacity:.5}
.btn-submit.loading .btn-spinner{display:flex;position:absolute}
.btn-submit.loading{pointer-events:none}

.form-feedback{
  text-align:center;
  font-size:.9rem;
  font-weight:500;
  min-height:1.5em;
  transition:opacity var(--dur-normal);
}
.form-feedback.success{color:var(--accent-green)}
.form-feedback.error{color:#ef4444}

/* ============================================================
   FOOTER
   ============================================================ */
.footer{
  background:var(--bg-surface);
  border-top:1px solid var(--border-color);
}
.footer-inner{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:2.5rem var(--container-pad);
  gap:2rem;
}
.footer-logo{
  font-family:var(--font-mono);
  font-size:1.2rem;
  font-weight:800;
  background:var(--gradient-cyan);
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
}
.footer-tagline{
  font-size:.8rem;
  color:var(--text-muted);
  margin-top:.25rem;
}
.footer-links{
  display:flex;
  gap:1.5rem;
  flex-wrap:wrap;
}
.footer-links a{
  font-size:.85rem;
  color:var(--text-secondary);
  transition:color var(--dur-fast);
}
.footer-links a:hover{color:var(--accent-cyan)}

.footer-bottom{
  border-top:1px solid var(--border-color);
  padding:1.25rem var(--container-pad);
}
.footer-bottom .container{
  display:flex;
  justify-content:space-between;
  align-items:center;
  flex-wrap:wrap;
  gap:.75rem;
}
.footer-bottom p{
  font-size:.8rem;
  color:var(--text-muted);
}
.footer-legal{display:flex;gap:1.5rem}
.footer-legal a{
  font-size:.8rem;
  color:var(--text-muted);
  transition:color var(--dur-fast);
}
.footer-legal a:hover{color:var(--text-primary)}

/* ============================================================
   RESPONSIVE — Mobile First
   ============================================================ */

/* Tablet (under 768px) */
@media (max-width:768px){
  .nav-links{display:none}
  .nav-toggle{display:flex}
  .nav-drawer{/* controlled by JS */}

  .hero-scroll{display:none}  /* scroll indicator overkill on touch */

  .about-grid{grid-template-columns:1fr}
  .service-pillars{grid-template-columns:1fr}
  .tech-grid{grid-template-columns:1fr 1fr;gap:.75rem}

  .contact-grid{
    grid-template-columns:1fr;
    gap:2rem;
  }
  .contact-form{padding:1.5rem}

  .footer-inner{flex-direction:column;text-align:center}
  .footer-bottom .container{flex-direction:column;text-align:center}
}

/* Small phone (under 480px) */
@media (max-width:480px){
  .hero-title{font-size:2rem}
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn{justify-content:center}

  .btn{padding:12px 22px;font-size:.9rem}

  .section-title{font-size:1.5rem}
  .tech-grid{grid-template-columns:1fr}

  .pillar-header{padding:1.5rem 1.25rem 1rem}
  .pillar-list{padding:0 1.25rem 1.5rem}

  .about-card{padding:1.5rem}
}

/* Desktop (1024px+) — subtle enhancements */
@media (min-width:1024px){
  .hero-content{max-width:820px}
}