/* ==========================================================================
   TransControl s.r.o. — DEMO web — dark industrial B2B theme
   Akcentová barva: industriální azurová/modrá (#2fb6d9) + doplňková oranžová (#ff8a3d)
   ========================================================================== */

:root {
  --bg-primary: #0b1117;
  --bg-secondary: #111a23;
  --bg-card: #16212c;
  --border-color: #233140;
  --text-primary: #eef3f7;
  --text-secondary: #a9b8c4;
  --text-muted: #7c8c99;
  --accent: #2fb6d9;
  --accent-light: #6fd4ee;
  --accent-orange: #ff8a3d;
  --success: #3ecf8e;
  --danger: #ff6b6b;
  --radius: 6px;
  --max-width: 1180px;
  --font-base: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-base);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--accent-light); text-decoration: none; }
a:hover { color: var(--accent); }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Demo banner --- */
.demo-banner {
  background: var(--accent-orange);
  color: #1a1004;
  text-align: center;
  font-weight: 600;
  font-size: 0.85rem;
  padding: 8px 16px;
  letter-spacing: 0.02em;
}

/* --- Header / nav --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 17, 23, 0.95);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border-color);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}

.logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.01em;
}
.logo span { color: var(--accent); }

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}

.main-nav a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
}
.main-nav a:hover { color: var(--accent-light); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  display: block;
  transition: transform 0.2s ease, opacity 0.2s ease;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease;
}
.btn-primary {
  background: var(--accent);
  color: #06222b;
}
.btn-primary:hover { background: var(--accent-light); color: #06222b; }

.btn-ghost {
  background: transparent;
  border-color: var(--border-color);
  color: var(--text-primary);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-light); }

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(11,17,23,0.75) 0%, rgba(11,17,23,0.88) 60%, rgba(11,17,23,0.97) 100%);
}
.hero-content {
  position: relative;
  z-index: 1;
  padding-top: 60px;
  padding-bottom: 60px;
  max-width: 760px;
}
.eyebrow {
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 14px;
}
.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.2rem);
  line-height: 1.15;
  margin: 0 0 20px;
}
.hero .lead {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 620px;
  margin-bottom: 32px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }

.media-caption {
  display: inline-block;
  font-size: 0.78rem;
  color: var(--text-muted);
  background: rgba(0,0,0,0.3);
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

/* --- Sections --- */
.section { padding: 90px 0; }
.section-alt { background: var(--bg-secondary); }

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0 0 16px;
  position: relative;
  padding-bottom: 14px;
}
.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 56px;
  height: 3px;
  background: var(--accent);
}
.section-intro {
  color: var(--text-secondary);
  max-width: 680px;
  margin-bottom: 40px;
  font-size: 1.05rem;
}

/* --- About --- */
.about-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: start;
}
.about-text p { color: var(--text-secondary); }
.about-stats {
  display: grid;
  gap: 16px;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px;
}
.stat-number {
  display: block;
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-light);
}
.stat-label {
  display: block;
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-top: 4px;
}
.stat-label em { color: var(--text-muted); font-style: italic; }

/* --- Cards grid --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 26px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}
.card h3 {
  margin-top: 0;
  color: var(--accent-light);
  font-size: 1.1rem;
}
.card p { color: var(--text-secondary); margin-bottom: 0; font-size: 0.95rem; }

/* --- Media block (figures) --- */
.media-block {
  margin: 0 0 20px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-color);
}
.media-block img { width: 100%; height: 360px; object-fit: cover; }
.media-block figcaption {
  padding: 10px 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
}

.disclaimer-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

/* --- Tech grid --- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 40px;
}
.tech-item {
  padding: 20px 0;
  border-bottom: 2px solid var(--border-color);
}
.tech-item h3 {
  color: var(--accent-orange);
  margin: 0 0 8px;
  font-size: 1.05rem;
}
.tech-item p { color: var(--text-secondary); margin: 0; font-size: 0.93rem; }

/* --- Contact --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 48px;
}
.contact-info h3 { color: var(--text-primary); }
.demo-tag {
  color: var(--accent-orange);
  font-size: 0.8rem;
  font-weight: 700;
  border: 1px solid var(--accent-orange);
  padding: 2px 8px;
  border-radius: 4px;
  vertical-align: middle;
}
.contact-info p { color: var(--text-secondary); }
.demo-note {
  font-size: 0.85rem;
  color: var(--accent-orange);
  background: rgba(255,138,61,0.08);
  border: 1px solid rgba(255,138,61,0.3);
  padding: 12px 14px;
  border-radius: var(--radius);
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 32px;
}
.contact-form h3 { margin-top: 0; }
.form-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 600;
}
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 11px 14px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}
.form-group.invalid input,
.form-group.invalid textarea {
  border-color: var(--danger);
}
.error-msg {
  display: block;
  min-height: 1.1em;
  color: var(--danger);
  font-size: 0.8rem;
  margin-top: 4px;
}
.form-success {
  margin-top: 18px;
  padding: 14px 16px;
  border-radius: var(--radius);
  background: rgba(62,207,142,0.1);
  border: 1px solid var(--success);
  color: var(--success);
  font-weight: 600;
  display: none;
}
.form-success.visible { display: block; }

/* --- Footer --- */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 28px 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}
.footer-inner p { margin: 4px 0; }

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 900px) {
  .about-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .card-grid,
  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 720px) {
  .nav-toggle { display: flex; }

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  .main-nav.open { max-height: 400px; }
  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 10px 24px 20px;
  }
  .main-nav li { border-bottom: 1px solid var(--border-color); }
  .main-nav a { display: block; padding: 14px 0; }

  .card-grid,
  .tech-grid {
    grid-template-columns: 1fr;
  }

  .section { padding: 60px 0; }
  .hero { min-height: 100vh; }
  .media-block img { height: 220px; }
}

@media (max-width: 400px) {
  .container { padding: 0 16px; }
  .hero-actions .btn { width: 100%; text-align: center; }
}