/* ============ Design tokens ============ */
:root{
  --bg: #11151a;
  --bg-elevated: #181d24;
  --bg-elevated-2: #1f262f;
  --border: #2a3139;
  --text: #eef1f4;
  --text-dim: #9aa5b1;
  --text-faint: #69727c;
  --accent: #2f8fd1;
  --accent-bright: #6cc6f7;
  --accent-dim: #1d3f57;

  --font-display: "Space Grotesk", "Inter", sans-serif;
  --font-body: "Inter", -apple-system, sans-serif;

  --container: 1180px;
  --radius: 10px;
  --radius-lg: 18px;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 7rem;
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

/* ============ Reset ============ */
*,*::before,*::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img{ max-width:100%; display:block; }
a{ color: inherit; text-decoration:none; }
ul{ margin:0; padding:0; list-style:none; }
h1,h2,h3,p,dl,dd{ margin:0; }
button{ font-family: inherit; }

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

.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ============ Header ============ */
.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(17, 21, 26, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content: space-between;
  height: 72px;
  gap: var(--space-3);
}
.logo{
  display:flex;
  align-items:center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  flex-shrink:0;
}
.logo-mark{ color: var(--accent-bright); display:flex; }

.main-nav{
  display:flex;
  gap: var(--space-3);
  font-size: 0.92rem;
  color: var(--text-dim);
}
.main-nav a{ transition: color 0.2s ease; white-space:nowrap; }
.main-nav a:hover{ color: var(--text); }

.header-actions{ display:flex; align-items:center; gap: var(--space-2); flex-shrink:0; }

.nav-toggle{
  display:none;
  flex-direction: column;
  justify-content:center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background:none;
  border:none;
  cursor:pointer;
}
.nav-toggle span{
  display:block;
  width: 100%;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* ============ Buttons ============ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  padding: 0.65rem 1.3rem;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
  white-space: nowrap;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}
.btn-accent{
  background: var(--accent);
  color: #ffffff;
}
.btn-accent:hover{ background: var(--accent-bright); color: #0b1014; }
.btn-ghost{
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-ghost:hover{ border-color: var(--accent-bright); color: var(--accent-bright); }
.btn-lg{ padding: 0.9rem 1.8rem; font-size: 1rem; }
.btn:active{ transform: scale(0.97); }

/* ============ Hero ============ */
.hero{
  position: relative;
  padding: var(--space-6) 0 var(--space-5);
  overflow: hidden;
}
.hero-route{
  position:absolute;
  inset: 0;
  z-index:0;
  opacity: 0.55;
}
.route-svg{
  width:100%;
  height:100%;
}
.route-svg path{
  fill:none;
  stroke: var(--border);
  stroke-width: 1.5;
  stroke-dasharray: 6 8;
}
.route-dot{
  position:absolute;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent-bright);
  box-shadow: 0 0 14px var(--accent-bright);
  offset-path: path('M -20 220 C 200 220, 260 60, 460 80 C 660 100, 700 240, 940 200 C 1100 175, 1140 120, 1220 90');
  animation: travel 9s linear infinite;
}
@keyframes travel{
  0%{ offset-distance: 0%; }
  100%{ offset-distance: 100%; }
}

.hero-inner{ position:relative; z-index:1; max-width: 760px; }
.eyebrow, .section-eyebrow{
  font-family: var(--font-display);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-bright);
  margin-bottom: var(--space-2);
  display:block;
}
.hero h1{
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  line-height: 1.08;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-3);
}
.hero-lead{
  font-size: 1.1rem;
  color: var(--text-dim);
  max-width: 540px;
  margin-bottom: var(--space-4);
}
.hero-actions{ display:flex; gap: var(--space-2); flex-wrap:wrap; }

/* ============ Sections ============ */
section{ padding: var(--space-6) 0; }
.section-title{
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.4vw, 2.4rem);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-4);
  max-width: 640px;
}

/* ============ Services ============ */
.services{ background: var(--bg-elevated); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.service-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow:hidden;
}
.service-card{
  background: var(--bg-elevated);
  padding: var(--space-4);
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.service-card.in-view{ opacity:1; transform: translateY(0); }
.service-icon{ color: var(--accent-bright); margin-bottom: var(--space-2); }
.service-card h3{
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}
.service-card p{ color: var(--text-dim); font-size: 0.94rem; }

/* ============ Tanks spotlight ============ */
.tanks-inner{
  display:grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: var(--space-5);
  align-items:center;
}
.tanks-lead{ color: var(--text-dim); margin-bottom: var(--space-3); max-width: 480px; }
.tanks-list{ display:flex; flex-direction:column; gap: 0.6rem; }
.tanks-list li{
  padding-left: 1.4rem;
  position:relative;
  color: var(--text-dim);
  font-size: 0.95rem;
}
.tanks-list li::before{
  content:"";
  position:absolute;
  left:0; top: 0.5em;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
}
.tanks-visual{ color: var(--accent-dim); }
.tank-shell{ color: var(--accent-bright); }

/* ============ Numbers ============ */
.numbers{ background: var(--bg-elevated-2); }
.numbers-grid{
  display:grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
}
.number-card{ display:flex; flex-direction:column; gap: 0.25rem; }
.number-value, .number-suffix{
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--accent-bright);
  display:inline;
}
.number-label{ color: var(--text-dim); font-size: 0.9rem; margin-top: 0.4rem; }

/* ============ Network ============ */
.network-tags{
  display:flex;
  flex-wrap:wrap;
  gap: 0.6rem;
}
.network-tags span{
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.4rem 1rem;
  font-size: 0.88rem;
  color: var(--text-dim);
}

/* ============ Contacts ============ */
.contacts{ background: var(--bg-elevated); border-top: 1px solid var(--border); }
.contacts-inner{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}
.contacts-lead{ color: var(--text-dim); margin-bottom: var(--space-3); }
.contact-details{ display:flex; flex-direction:column; gap: var(--space-2); }
.contact-details dt{ font-size: 0.82rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.04em; }
.contact-details dd{ font-size: 1.05rem; margin-top: 0.2rem; }
.contact-details a:hover{ color: var(--accent-bright); }

.contact-form{
  background: var(--bg-elevated-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  display:flex;
  flex-direction:column;
  gap: var(--space-2);
}
.contact-form h3{ font-family: var(--font-display); font-size: 1.2rem; margin-bottom: 0.3rem; }
.contact-form label{ font-size: 0.85rem; color: var(--text-dim); }
.contact-form input, .contact-form textarea{
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.65rem 0.8rem;
  color: var(--text);
  font-family: inherit;
  font-size: 0.95rem;
  resize: vertical;
}
.contact-form input:focus, .contact-form textarea:focus{ border-color: var(--accent); }
.form-status{ font-size: 0.88rem; color: var(--accent-bright); min-height: 1.2em; }

/* ============ Footer ============ */
.site-footer{ border-top: 1px solid var(--border); padding: var(--space-3) 0; }
.footer-inner{
  display:flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-faint);
  flex-wrap:wrap;
  gap: 0.5rem;
}

/* ============ Responsive ============ */
@media (max-width: 980px){
  .main-nav{ display:none; }
  .nav-toggle{ display:flex; }
  .service-grid{ grid-template-columns: repeat(2, 1fr); }
  .tanks-inner{ grid-template-columns: 1fr; }
  .tanks-visual{ order:-1; max-width: 360px; margin: 0 auto; }
  .contacts-inner{ grid-template-columns: 1fr; }
  .numbers-grid{ grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px){
  .service-grid{ grid-template-columns: 1fr; }
  .header-actions .btn{ padding: 0.55rem 1rem; font-size: 0.85rem; }
  section{ padding: var(--space-5) 0; }
  .hero{ padding-top: var(--space-5); }
}

/* Mobile nav open state */
.main-nav.open{
  display:flex;
  flex-direction:column;
  position:absolute;
  top: 72px;
  left:0; right:0;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  padding: var(--space-2) 1.5rem var(--space-3);
  gap: var(--space-2);
}