/* ============ Variables ============ */
:root {
  --blue: #1E4FA3;
  --blue-dark: #163C7D;
  --blue-light: #EAF1FB;
  --blue-soft: #F5F8FE;
  --text-dark: #16233D;
  --text-muted: #5B6B85;
  --white: #FFFFFF;
  --border: #E4EAF3;
  --radius: 12px;
  --shadow: 0 10px 30px rgba(30, 79, 163, 0.08);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

/* ============ Reset ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text-dark);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-primary {
  background: var(--blue);
  color: var(--white);
}
.btn-primary:hover {
  background: var(--blue-dark);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border-color: var(--blue);
  color: var(--blue);
}
.btn-outline:hover {
  background: var(--blue);
  color: var(--white);
  transform: translateY(-2px);
}

.btn-block { width: 100%; }

.btn-header {
  padding: 10px 22px;
  font-size: 0.9rem;
}

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 20px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--text-dark);
  flex-shrink: 0;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: var(--blue);
  color: var(--white);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
  margin-left: auto;
}

.nav a {
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.nav a:hover { color: var(--blue); }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text-dark);
  border-radius: 2px;
  transition: all 0.25s ease;
}

/* ============ Hero ============ */
.hero {
  padding: 110px 0 90px;
  background: linear-gradient(180deg, var(--blue-soft) 0%, var(--white) 100%);
  text-align: center;
}

.hero-inner {
  max-width: 760px;
}

.badge {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--blue-light);
  color: var(--blue);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.3px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(2rem, 4.5vw, 3.1rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-dark);
  margin-bottom: 20px;
}

.hero-sub {
  font-size: 1.08rem;
  color: var(--text-muted);
  max-width: 620px;
  margin: 0 auto 36px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ============ Sections ============ */
.section { padding: 90px 0; }
.section-alt { background: var(--blue-soft); }

.section-head {
  text-align: center;
  max-width: 620px;
  margin: 0 auto 56px;
}

.eyebrow {
  display: inline-block;
  color: var(--blue);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-head h2, .about-text h2, .contact-info h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  margin-bottom: 14px;
  color: var(--text-dark);
}

.section-head p { color: var(--text-muted); }

/* ============ About ============ */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 56px;
  align-items: start;
}

.about-text p {
  color: var(--text-muted);
  margin-bottom: 16px;
}

.about-facts {
  margin-top: 24px;
  border-top: 1px solid var(--border);
  padding-top: 20px;
}

.about-facts li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.95rem;
  color: var(--text-muted);
}

.about-facts li:last-child { border-bottom: none; }
.about-facts strong { color: var(--text-dark); margin-right: 6px; }

.about-card {
  background: var(--blue);
  color: var(--white);
  border-radius: var(--radius);
  padding: 40px 32px;
  box-shadow: var(--shadow);
}

.about-card-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: 20px;
}

.about-card h3 { font-size: 1.2rem; margin-bottom: 12px; }
.about-card p { color: rgba(255, 255, 255, 0.85); font-size: 0.95rem; }

/* ============ Services ============ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 26px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.service-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--blue-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 18px;
}

.service-card h3 { font-size: 1.05rem; margin-bottom: 10px; }
.service-card p { color: var(--text-muted); font-size: 0.92rem; }

/* ============ Why Us ============ */
.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}

.why-number {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--blue-light);
  -webkit-text-stroke: 1.5px var(--blue);
  margin-bottom: 14px;
}

.why-item h3 { font-size: 1.05rem; margin-bottom: 10px; }
.why-item p { color: var(--text-muted); font-size: 0.92rem; }

/* ============ Contact ============ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}

.contact-info p { color: var(--text-muted); margin-bottom: 28px; }

.contact-list { margin-bottom: 28px; }

.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.contact-list li div { display: flex; flex-direction: column; gap: 2px; }
.contact-list li strong { font-size: 0.85rem; color: var(--text-dark); }
.contact-list li a, .contact-list li span:last-child {
  color: var(--text-muted);
  font-size: 0.95rem;
}
.contact-list li a:hover { color: var(--blue); }

.contact-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 10px;
  background: var(--blue-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.contact-form {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow);
}

.contact-form h3 { font-size: 1.2rem; margin-bottom: 22px; }

.contact-form label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 6px;
  margin-top: 16px;
}

.contact-form label:first-of-type { margin-top: 0; }

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: var(--font);
  font-size: 0.95rem;
  color: var(--text-dark);
  background: var(--blue-soft);
  transition: border-color 0.2s ease;
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--blue);
  background: var(--white);
}

.contact-form button { margin-top: 22px; }

.form-note {
  margin-top: 14px;
  font-size: 0.88rem;
  color: var(--blue);
  text-align: center;
  min-height: 1.2em;
}

/* ============ Footer ============ */
.site-footer {
  background: var(--text-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 40px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: var(--white);
}

.footer-inner p { font-size: 0.85rem; }

/* ============ Back to top ============ */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--blue);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.25s ease;
  z-index: 90;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ============ Responsive ============ */
@media (max-width: 900px) {
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 720px) {
  .nav {
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 24px 28px;
    gap: 18px;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s ease;
  }

  .nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-toggle { display: flex; }
  .btn-header { display: none; }
  .logo-text { display: none; }

  .services-grid, .why-grid { grid-template-columns: 1fr; }
  .hero { padding: 90px 0 64px; }
  .section { padding: 64px 0; }
}

.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }