/* ===== BRIDGE OS- SHARED DESIGN SYSTEM ===== */

/* Reset */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #006397;
  --primary-light: #3498DB;
  --primary-dim: #92CCFF;
  --primary-ghost: rgba(0, 99, 151, 0.06);
  --primary-10: rgba(0, 99, 151, 0.1);
  --surface: #FFFFFF;
  --surface-low: #F3F3F4;
  --surface-container: #EEEEEE;
  --on-surface: #1A1C1C;
  --on-surface-variant: #5A6068;
  --outline-variant: rgba(191, 199, 210, 0.15);
  --dark-bg: #0C1220;
  --dark-surface: #141D2E;
  --font: 'Manrope', -apple-system, BlinkMacSystemFont, sans-serif;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

html { font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; scroll-behavior: smooth; }
body { font-family: var(--font); color: var(--on-surface); background: var(--surface); line-height: 1.6; overflow-x: hidden; }
a { text-decoration: none; color: inherit; }
button { border: none; cursor: pointer; font-family: inherit; }
input, textarea, select { font-family: inherit; }
img { display: block; max-width: 100%; }
::selection { background: rgba(0, 99, 151, 0.12); color: var(--primary); }

/* ===== LAYOUT ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
@media (min-width: 768px) { .container { padding: 0 2.5rem; } }
@media (min-width: 1024px) { .container { padding: 0 3rem; } }

/* ===== NAV ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.85); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  transition: box-shadow 0.4s ease;
}
.nav.scrolled { box-shadow: 0 1px 0 rgba(0,0,0,0.04); }
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  max-width: 1200px; margin: 0 auto; padding: 1rem 1.5rem;
}
@media (min-width: 768px) { .nav-inner { padding: 1.25rem 2.5rem; } }
.nav-logo {
  font-size: 1.125rem; font-weight: 800; letter-spacing: -0.04em; color: var(--on-surface);
  display: flex; align-items: center; gap: 0.5rem;
}
.nav-logo svg { width: 1.5rem; height: 1.5rem; }
.nav-links { display: none; align-items: center; gap: 2.25rem; }
@media (min-width: 768px) { .nav-links { display: flex; } }
.nav-links a {
  font-size: 0.8125rem; font-weight: 600; color: var(--on-surface-variant);
  transition: color 0.2s ease; letter-spacing: -0.01em;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-cta {
  display: inline-flex; align-items: center; gap: 0.375rem;
  background: var(--primary); color: white;
  padding: 0.5rem 1.25rem; border-radius: 9999px;
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.01em;
  transition: transform 0.2s var(--ease-spring), box-shadow 0.2s ease;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(0, 99, 151, 0.25); }
.nav-cta:active { transform: scale(0.97); }
@media (min-width: 768px) { .nav-cta { padding: 0.625rem 1.5rem; font-size: 0.8125rem; } }
.nav-mobile-btn {
  display: flex; align-items: center; justify-content: center;
  width: 2.5rem; height: 2.5rem; background: transparent; border-radius: 0.5rem;
  transition: background 0.2s ease;
}
.nav-mobile-btn:hover { background: var(--surface-low); }
@media (min-width: 768px) { .nav-mobile-btn { display: none; } }
.nav-mobile-btn svg { width: 1.25rem; height: 1.25rem; stroke: var(--on-surface); }
.nav-actions { display: flex; align-items: center; gap: 0.75rem; }

/* Mobile menu */
.mobile-menu {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(255, 255, 255, 0.98); backdrop-filter: blur(24px);
  z-index: 200; flex-direction: column; align-items: center; justify-content: center; gap: 2rem;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  font-size: 1.5rem; font-weight: 700; color: var(--on-surface);
  transition: color 0.2s ease; letter-spacing: -0.02em;
}
.mobile-menu a:hover { color: var(--primary); }
.mobile-menu-close {
  position: absolute; top: 1rem; right: 1.5rem;
  width: 2.5rem; height: 2.5rem; display: flex; align-items: center; justify-content: center;
  background: transparent; border-radius: 0.5rem;
}

/* ===== BUTTONS ===== */
.btn-primary {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white; padding: 0.875rem 2rem; border-radius: 9999px;
  font-size: 0.875rem; font-weight: 700; letter-spacing: -0.01em;
  transition: transform 0.2s var(--ease-spring), box-shadow 0.3s ease;
  box-shadow: 0 2px 12px rgba(0, 99, 151, 0.2);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0, 99, 151, 0.3); }
.btn-primary:active { transform: scale(0.97); }
.btn-secondary {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: transparent; color: var(--on-surface);
  padding: 0.875rem 2rem; border-radius: 9999px;
  font-size: 0.875rem; font-weight: 600;
  border: 1.5px solid var(--surface-container);
  transition: border-color 0.2s ease, background 0.2s ease;
}
.btn-secondary:hover { border-color: var(--primary-light); background: var(--primary-ghost); }
.btn-icon { width: 1rem; height: 1rem; }
.btn-sm { padding: 0.625rem 1.5rem; font-size: 0.8125rem; }

/* ===== SECTION SHARED ===== */
.section { padding: 6rem 0; }
@media (min-width: 768px) { .section { padding: 8rem 0; } }
@media (min-width: 1024px) { .section { padding: 10rem 0; } }
.section-label {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.6875rem; font-weight: 700; color: var(--primary);
  letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 1rem;
}
.section-label-line { width: 1.5rem; height: 1px; background: var(--primary); }
.section-title {
  font-size: clamp(2rem, 4.5vw, 3.5rem); font-weight: 800;
  line-height: 1.1; letter-spacing: -0.035em; margin-bottom: 1rem;
}
.section-desc {
  font-size: clamp(0.9375rem, 2vw, 1.125rem); color: var(--on-surface-variant);
  font-weight: 400; line-height: 1.7; max-width: 520px;
}

/* ===== PAGE HERO (subpages) ===== */
.page-hero {
  padding: 10rem 0 4rem; position: relative; overflow: hidden;
}
@media (min-width: 768px) { .page-hero { padding: 12rem 0 5rem; } }
.page-hero-bg {
  position: absolute; inset: 0; pointer-events: none;
}
.page-hero-bg-circle {
  position: absolute; border-radius: 50%;
  background: radial-gradient(circle, var(--primary-ghost) 0%, transparent 70%);
}
.page-hero-bg-circle:nth-child(1) { width: 500px; height: 500px; top: -150px; right: -100px; opacity: 0.6; }
.page-hero-bg-circle:nth-child(2) { width: 350px; height: 350px; bottom: -80px; left: -60px; opacity: 0.4; }
.page-hero .section-title {
  font-size: clamp(2.25rem, 5vw, 4rem); margin-bottom: 1.25rem;
}

/* ===== FOOTER ===== */
.footer { background: var(--surface); padding: 2rem 0; border-top: 1px solid var(--surface-low); }
.footer-inner {
  display: flex; flex-direction: column; align-items: center; gap: 1rem; text-align: center;
}
@media (min-width: 768px) { .footer-inner { flex-direction: row; justify-content: space-between; text-align: left; } }
.footer-logo { font-size: 0.875rem; font-weight: 800; color: var(--on-surface); opacity: 0.4; letter-spacing: -0.03em; }
.footer-links { display: flex; gap: 2rem; }
.footer-links a {
  font-size: 0.6875rem; font-weight: 600; color: var(--on-surface-variant);
  text-transform: uppercase; letter-spacing: 0.06em; opacity: 0.5;
  transition: opacity 0.2s ease;
}
.footer-links a:hover { opacity: 1; color: var(--primary); }
.footer-copy { font-size: 0.6875rem; color: var(--on-surface-variant); opacity: 0.4; }

/* ===== CARDS ===== */
.card {
  background: var(--surface); border-radius: 1.25rem;
  padding: 2rem 1.75rem; transition: transform 0.4s var(--ease-out-expo);
  position: relative; overflow: hidden;
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary-light), transparent);
  opacity: 0; transition: opacity 0.4s ease;
}
.card:hover { transform: translateY(-4px); }
.card:hover::before { opacity: 1; }
.card-icon {
  width: 3rem; height: 3rem; border-radius: 0.75rem;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1.25rem; background: var(--primary-ghost);
}
.card-icon svg { width: 1.25rem; height: 1.25rem; fill: var(--primary); }
.card h3 { font-size: 1.0625rem; font-weight: 700; margin-bottom: 0.5rem; letter-spacing: -0.01em; }
.card p { font-size: 0.8125rem; color: var(--on-surface-variant); line-height: 1.7; }

/* ===== FORM ELEMENTS ===== */
.form-input {
  width: 100%; background: var(--surface-low); border: none; outline: none;
  border-radius: 0.75rem; padding: 0.875rem 1rem;
  font-size: 0.8125rem; color: var(--on-surface);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}
.form-input:focus { background: var(--surface); box-shadow: 0 0 0 2px rgba(0, 99, 151, 0.15); }
.form-input::placeholder { color: var(--on-surface-variant); font-weight: 400; }
textarea.form-input { resize: none; min-height: 5rem; }
.form-row { display: grid; grid-template-columns: 1fr; gap: 0.75rem; margin-bottom: 0.75rem; }
@media (min-width: 480px) { .form-row { grid-template-columns: 1fr 1fr; } }
.form-submit {
  width: 100%; background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: white; padding: 0.875rem; border-radius: 0.75rem;
  font-size: 0.875rem; font-weight: 700;
  transition: transform 0.2s var(--ease-spring), box-shadow 0.3s ease;
  box-shadow: 0 2px 12px rgba(0, 99, 151, 0.15);
}
.form-submit:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(0, 99, 151, 0.25); }
.form-submit:active { transform: scale(0.98); }

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse-ring {
  0%, 100% { transform: scale(1); opacity: 0.3; }
  50% { transform: scale(1.8); opacity: 0; }
}
.reveal {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.7s var(--ease-out-expo), transform 0.7s var(--ease-out-expo);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ===== DARK SECTION ===== */
.section-dark { background: var(--dark-bg); color: white; }
.section-dark .section-label { color: var(--primary-dim); }
.section-dark .section-label-line { background: var(--primary-dim); }
.section-dark .section-desc { color: rgba(255, 255, 255, 0.5); }

/* ===== RESPONSIVE ===== */
@media (max-width: 767px) {
  .section { padding: 4rem 0; }
  .page-hero { padding: 7rem 0 3rem; }
}