:root {
  --bg: #0B1120;
  --surface: #111827;
  --surface-2: #0F172A;
  --text: #F8FAFC;
  --text-secondary: #94A3B8;
  --accent: #38BDF8;
  --border: #1E293B;
}

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
}

.text-secondary { color: var(--text-secondary) !important; }
.accent { color: var(--accent); }
.mono { font-family: 'JetBrains Mono', monospace; }

.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(11, 17, 32, 0.85);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 1030;
}

.navbar-brand { color: var(--text); font-size: 1.25rem; letter-spacing: 0.03em; }
.nav-link { color: var(--text-secondary) !important; font-weight: 500; }
.nav-link:hover, .nav-link.active { color: var(--text) !important; }

.btn-outline-accent {
  border: 1px solid var(--accent);
  color: var(--accent);
}
.btn-outline-accent:hover { background: var(--accent); color: #0B1120; }

.btn-accent {
  background: var(--accent);
  color: #0B1120;
  border: none;
  font-weight: 600;
}
.btn-accent:hover { opacity: 0.9; color: #0B1120; }

.hero {
  padding: 6rem 0 4rem;
  border-bottom: 1px solid var(--border);
  background: radial-gradient(circle at top right, rgba(56,189,248,0.08), transparent 60%);
}

.hero h1 { font-size: 2.75rem; font-weight: 700; line-height: 1.15; }
.hero .lead { color: var(--text-secondary); font-size: 1.15rem; max-width: 620px; }

.surface-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  padding: 1.75rem;
  height: 100%;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.surface-card:hover { border-color: var(--accent); transform: translateY(-3px); }

.section { padding: 5rem 0; }
.section-title { font-size: 1.9rem; font-weight: 700; margin-bottom: 0.5rem; }
.section-subtitle { color: var(--text-secondary); margin-bottom: 3rem; max-width: 640px; }

.architecture-diagram {
  border: 1px solid var(--border);
  border-radius: 0.75rem;
  background: var(--surface-2);
  padding: 2.5rem;
  font-family: 'JetBrains Mono', monospace;
}

.diagram-node {
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 0.5rem;
  padding: 0.6rem 1rem;
  display: inline-block;
  background: rgba(56,189,248,0.06);
  font-size: 0.9rem;
}

.diagram-arrow { color: var(--text-secondary); text-align: center; margin: 0.4rem 0; font-size: 1.2rem; }

.badge-tech {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.75rem;
  padding: 0.35rem 0.7rem;
  border-radius: 2rem;
  margin: 0.15rem;
  display: inline-block;
}

.timeline { border-left: 2px solid var(--border); margin-left: 1rem; padding-left: 2rem; }
.timeline-item { position: relative; margin-bottom: 2.5rem; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -2.1rem;
  top: 0.3rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
}

.skill-group h6 { color: var(--accent); text-transform: uppercase; font-size: 0.8rem; letter-spacing: 0.08em; margin-bottom: 0.8rem; }

.site-footer { border-top: 1px solid var(--border); background: var(--surface-2); }

.form-control, .form-select {
  background-color: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
}
.form-control:focus, .form-select:focus {
  background-color: var(--surface);
  color: var(--text);
  border-color: var(--accent);
  box-shadow: 0 0 0 0.2rem rgba(56,189,248,0.15);
}

.card-blog { border: 1px solid var(--border); background: var(--surface); border-radius: 0.75rem; }
.card-blog:hover { border-color: var(--accent); }

@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .architecture-diagram { padding: 1.25rem; }
}

.captcha-box {
  background: var(--surface-2);
  border: 1px dashed var(--border);
  border-radius: 0.5rem;
  padding: 0.85rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: 'JetBrains Mono', monospace;
}

.whatsapp-float {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1050;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: #25D366;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 24px rgba(0,0,0,0.35);
  transition: transform 0.2s ease;
  text-decoration: none;
}
.whatsapp-float:hover { transform: scale(1.08); }
.whatsapp-float i { color: #fff; font-size: 1.8rem; }

@media (max-width: 576px) {
  .whatsapp-float { width: 50px; height: 50px; bottom: 16px; right: 16px; }
  .whatsapp-float i { font-size: 1.5rem; }
}

/* Contact Form - intl-tel-input dark theme overrides */
.iti { width: 100%; }
.iti__tel-input, #phoneInput {
  background: var(--surface-2) !important;
  border: 1px solid var(--border) !important;
  color: var(--text) !important;
  height: calc(3.1rem);
}
.iti__selected-flag { background: var(--surface-2) !important; }
.iti__selected-dial-code { color: var(--text-secondary) !important; }
.iti__country-list {
  background: var(--surface) !important;
  border: 1px solid var(--border) !important;
  color: var(--text) !important;
}
.iti__country { color: var(--text) !important; }
.iti__country:hover, .iti__country.iti__highlight { background: var(--surface-2) !important; }
.iti__divider { border-bottom: 1px solid var(--border) !important; }
.iti__search-input {
  background: var(--surface-2) !important;
  border: 1px solid var(--border) !important;
  color: var(--text) !important;
}
.iti__dial-code { color: var(--text-secondary) !important; }

.field-icon {
  background: var(--surface-2);
  border-color: var(--border);
  color: var(--text-secondary);
}

#contactForm .form-control.is-invalid,
#contactForm .iti__tel-input.is-invalid {
  border-color: #f87171 !important;
}