/* ═══════════════════════════════════════════════
   STRELKO SOLUTIONS — Global Stylesheet
   Brand: Forge Black / Blueprint Blue / Steel
   Fonts: Barlow Condensed (display) + Barlow (body)
═══════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Barlow:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400&family=Barlow+Condensed:wght@300;400;600;700;900&display=swap');

/* ── TOKENS ── */
:root {
  --forge:       #0B0F14;
  --forge-mid:   #10161E;
  --forge-light: #141C26;
  --border:      #1C2C3C;
  --border-mid:  #243444;
  --steel-hi:    #D0E4F0;
  --steel-mid:   #8BBCD8;
  --sky:         #60B8E0;
  --blueprint:   #2878B4;
  --midnight:    #0B3F74;
  --off-white:   #E4E2DE;
  --off-white-2: #F8F7F4;
  --body-text:   #C0C8D0;
  --muted:       #4A6278;
  --accent:      #60B8E0;

  --font-display: 'Barlow Condensed', 'Arial Narrow', sans-serif;
  --font-body:    'Barlow', sans-serif;

  --max-w: 1200px;
  --section-pad: 100px 48px;
  --radius: 3px;

  /* Gradient definitions */
  --grad-beam: linear-gradient(90deg, #8BBCD8 0%, #D0E4F0 45%, #60B8E0 75%, #2878B4 100%);
  --grad-blue: linear-gradient(135deg, #2878B4 0%, #0B3F74 100%);
  --grad-dark: linear-gradient(180deg, #0B0F14 0%, #10161E 100%);
}

/* ── RESET ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--forge);
  color: var(--body-text);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ── TYPOGRAPHY ── */
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--off-white);
  line-height: 1.05;
}
h1 { font-size: clamp(48px, 7vw, 88px); letter-spacing: 0.04em; }
h2 { font-size: clamp(32px, 4vw, 52px); }
h3 { font-size: clamp(20px, 2.5vw, 28px); }
h4 { font-size: 16px; letter-spacing: 0.14em; }

.display-tag {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 20px;
  display: block;
}

.gradient-text {
  background: var(--grad-beam);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── LAYOUT ── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 48px;
}
@media (max-width: 768px) { .container { padding: 0 24px; } }

.section-pad { padding: var(--section-pad); }

/* ── NAVIGATION ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(11, 15, 20, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 48px;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
@media (max-width: 768px) { .nav-inner { padding: 0 24px; } }

.nav-logo {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}
.nav-logo-mark { width: 36px; height: 36px; }
.nav-logo-text {
  display: flex;
  flex-direction: column;
}
.nav-logo-name {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--off-white);
  line-height: 1;
}
.nav-logo-tag {
  font-family: var(--font-display);
  font-size: 7.5px;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  background: var(--grad-beam);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-top: 3px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav-links a {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.2s;
  position: relative;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 0; height: 1px;
  background: var(--sky);
  transition: width 0.25s;
}
.nav-links a:hover { color: var(--off-white); }
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: var(--off-white); }
.nav-links a.active::after { width: 100%; }

.nav-cta {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--forge) !important;
  background: var(--grad-beam);
  padding: 10px 22px;
  border-radius: var(--radius);
  transition: opacity 0.2s, transform 0.2s;
}
.nav-cta:hover { opacity: 0.88; transform: translateY(-1px); }
.nav-cta::after { display: none !important; }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--off-white);
  transition: all 0.3s;
}

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 72px; left: 0; right: 0;
    background: var(--forge-mid);
    border-bottom: 1px solid var(--border);
    padding: 28px 24px;
    gap: 20px;
    align-items: flex-start;
  }
  .nav-cta { align-self: flex-start; }
}

/* ── BUTTONS ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--forge);
  background: var(--grad-beam);
  padding: 16px 36px;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.15s;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-2px); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--steel-mid);
  background: transparent;
  padding: 15px 35px;
  border-radius: var(--radius);
  border: 1px solid var(--border-mid);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, transform 0.15s;
}
.btn-ghost:hover {
  border-color: var(--sky);
  color: var(--off-white);
  transform: translateY(-2px);
}

/* ── SECTION DIVIDER ── */
.divider {
  width: 48px;
  height: 2px;
  background: var(--grad-beam);
  margin: 20px 0 32px;
}

/* ── CARDS ── */
.card {
  background: var(--forge-mid);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  transition: border-color 0.25s, transform 0.25s;
}
.card:hover {
  border-color: var(--border-mid);
  transform: translateY(-3px);
}

/* ── LIGHT SECTIONS ── */
.section-light {
  background: var(--off-white-2);
  color: #1A2A3A;
}
.section-light h2,
.section-light h3,
.section-light h4 { color: #0C1620; }
.section-light .display-tag { color: #8AAABB; }
.section-light .divider { background: linear-gradient(90deg, #1A5A8C, #0B3F74, #2878B4); }
.section-light p { color: #3A5068; }

/* ── FORM ELEMENTS ── */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.form-group label {
  font-family: var(--font-display);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--muted);
}
.form-group input,
.form-group textarea,
.form-group select {
  background: var(--forge-light);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--off-white);
  outline: none;
  transition: border-color 0.2s;
  width: 100%;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--sky);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group select option { background: var(--forge-mid); }

/* ── FOOTER ── */
footer {
  background: var(--forge);
  border-top: 1px solid var(--border);
  padding: 60px 48px 40px;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
@media (max-width: 900px) {
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 36px; }
}
@media (max-width: 600px) {
  .footer-inner { grid-template-columns: 1fr; }
  footer { padding: 48px 24px 32px; }
}

.footer-brand p {
  font-size: 13px;
  color: var(--muted);
  margin-top: 14px;
  line-height: 1.8;
  max-width: 260px;
}
.footer-col h4 {
  font-family: var(--font-display);
  font-size: 10px;
  letter-spacing: 0.36em;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 18px;
}
.footer-col a {
  display: block;
  font-size: 13px;
  color: #3A5068;
  margin-bottom: 10px;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--steel-mid); }

.footer-bottom {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-top: 28px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p {
  font-size: 11px;
  color: #1E3040;
  letter-spacing: 0.06em;
}

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
.animate-up {
  opacity: 0;
  animation: fadeUp 0.7s ease forwards;
}
.animate-in {
  opacity: 0;
  animation: fadeIn 0.6s ease forwards;
}
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }
.delay-5 { animation-delay: 0.5s; }

/* Scroll-triggered reveal */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── PAGE HERO BASE ── */
.page-hero {
  padding: 160px 48px 80px;
  background: var(--forge);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: -100px; right: -100px;
  width: 600px; height: 600px;
  background: radial-gradient(ellipse, rgba(40,120,180,0.08) 0%, transparent 70%);
  pointer-events: none;
}
@media (max-width: 768px) {
  .page-hero { padding: 130px 24px 60px; }
  :root { --section-pad: 72px 24px; }
}

/* ── ACTIVE NAV STATE ── */
[data-page="home"]     .nav-home,
[data-page="services"] .nav-services,
[data-page="portfolio"].nav-portfolio,
[data-page="about"]    .nav-about,
[data-page="contact"]  .nav-contact { color: var(--off-white) !important; }

[data-page="home"]     .nav-home::after,
[data-page="services"] .nav-services::after,
[data-page="portfolio"].nav-portfolio::after,
[data-page="about"]    .nav-about::after,
[data-page="contact"]  .nav-contact::after { width: 100%; }