/* ==========================================================================
   Tektrade US — Technology & Business Consulting
   Master Stylesheet (css/styles.css)
   Clean, Responsive, Fast-Loading Vanilla CSS
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* --- CSS Variables & Design System Tokens --- */
:root {
  --primary-navy: #0A192F;
  --primary-blue: #1E3A8A;
  --accent-blue: #2563EB;
  --accent-sky: #0284C7;
  --hover-blue: #1D4ED8;
  --slate-dark: #334155;
  --slate-muted: #64748B;
  --slate-light: #94A3B8;
  --bg-light: #F8FAFC;
  --bg-white: #FFFFFF;
  --card-border: #E2E8F0;
  
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08), 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 28px rgba(15, 23, 42, 0.12), 0 4px 8px rgba(15, 23, 42, 0.06);
  --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.2);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-pill: 9999px;

  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-light);
  color: var(--slate-dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--accent-blue);
  text-decoration: none;
  transition: var(--transition);
}

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

/* --- Layout Utility Classes --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-alt {
  background-color: var(--bg-white);
  border-top: 1px solid var(--card-border);
  border-bottom: 1px solid var(--card-border);
}

.text-center {
  text-align: center;
}

.badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  background-color: rgba(37, 99, 235, 0.1);
  color: var(--accent-blue);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  border-radius: var(--radius-pill);
  margin-bottom: 1rem;
}

/* --- Header & Navigation Bar --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--card-border);
  box-shadow: var(--shadow-sm);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

.logo-link {
  display: flex;
  align-items: center;
}

.logo-img {
  height: 48px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--slate-dark);
  padding: 0.5rem 0;
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent-blue);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-blue);
  border-radius: 2px;
}

.nav-btn {
  padding: 0.65rem 1.4rem;
  background-color: var(--accent-blue);
  color: #FFFFFF !important;
  font-weight: 600;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.nav-btn:hover {
  background-color: var(--hover-blue);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* Mobile Toggle Hamburger Button */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2.5px;
  background-color: var(--primary-navy);
  margin: 5px 0;
  transition: var(--transition);
  border-radius: 2px;
}

/* --- Hero Section --- */
.hero {
  padding: 5rem 0 6rem 0;
  background: linear-gradient(135deg, #0A192F 0%, #1E3A8A 100%);
  color: #FFFFFF;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3.5rem;
  align-items: center;
}

.hero-content h1 {
  font-size: 2.75rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.25rem;
  color: #FFFFFF;
  letter-spacing: -0.5px;
}

.hero-subheader {
  font-size: 1.25rem;
  font-weight: 500;
  color: #93C5FD;
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.hero-intro {
  font-size: 1.05rem;
  color: #E2E8F0;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 2.2rem;
  background-color: var(--accent-blue);
  color: #FFFFFF !important;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-glow);
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background-color: #3B82F6;
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(37, 99, 235, 0.4);
}

.hero-visual img {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

/* --- Section Headers --- */
.section-header {
  max-width: 750px;
  margin: 0 auto 3.5rem auto;
  text-align: center;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--primary-navy);
  margin-bottom: 0.75rem;
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--slate-muted);
}

/* --- Cards & Grid Layouts --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2rem;
}

.service-card {
  background-color: var(--bg-white);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-md);
  padding: 2.25rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.service-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: #CBD5E1;
}

.card-icon {
  width: 52px;
  height: 52px;
  background-color: rgba(37, 99, 235, 0.08);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  color: var(--accent-blue);
}

.service-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--primary-navy);
  margin-bottom: 0.75rem;
}

.service-card p {
  color: var(--slate-muted);
  font-size: 0.98rem;
  line-height: 1.6;
}

/* --- Who We Are & How We Work Component --- */
.bio-card {
  background: var(--bg-white);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-md);
  margin-bottom: 3rem;
}

.leader-heading {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--primary-navy);
  margin-bottom: 1rem;
}

.linkedin-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.linkedin-link:hover {
  transform: scale(1.15);
}

.bio-text {
  font-size: 1.1rem;
  color: var(--slate-dark);
  line-height: 1.75;
}

.work-model-card {
  background: linear-gradient(135deg, #0A192F 0%, #1E293B 100%);
  color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-lg);
}

.work-model-card h3 {
  font-size: 1.75rem;
  font-weight: 800;
  color: #FFFFFF;
  margin-bottom: 1rem;
}

.work-model-card p {
  font-size: 1.1rem;
  color: #E2E8F0;
  line-height: 1.8;
}

/* --- Contact Page Form & Layout --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 3.5rem;
  align-items: start;
}

.contact-info-panel {
  background-color: var(--primary-navy);
  color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-md);
}

.contact-info-panel h3 {
  font-size: 1.75rem;
  font-weight: 800;
  margin-bottom: 1rem;
  color: #FFFFFF;
}

.contact-info-panel p {
  color: #94A3B8;
  margin-bottom: 2rem;
  font-size: 1rem;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.contact-item-icon {
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #38BDF8;
  flex-shrink: 0;
}

.contact-item-text label {
  display: block;
  font-size: 0.85rem;
  color: #94A3B8;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.contact-item-text span {
  font-size: 1.05rem;
  font-weight: 600;
  color: #FFFFFF;
}

.contact-form-card {
  background-color: var(--bg-white);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--slate-dark);
  margin-bottom: 0.5rem;
}

.form-control {
  width: 100%;
  padding: 0.85rem 1rem;
  font-family: var(--font-main);
  font-size: 1rem;
  color: var(--slate-dark);
  background-color: var(--bg-light);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-blue);
  background-color: #FFFFFF;
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.12);
}

textarea.form-control {
  resize: vertical;
  min-height: 140px;
}

.form-submit-btn {
  width: 100%;
  padding: 1rem;
  font-size: 1.05rem;
}

/* Form Alert Feedback Message */
.form-alert {
  padding: 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1.5rem;
  display: none;
  font-weight: 600;
  font-size: 0.95rem;
}

.form-alert.success {
  display: block;
  background-color: #DCFCE7;
  color: #166534;
  border: 1px solid #BBF7D0;
}

.form-alert.error {
  display: block;
  background-color: #FEE2E2;
  color: #991B1B;
  border: 1px solid #FECACA;
}

/* --- Call To Action Section --- */
.cta-banner {
  background: linear-gradient(135deg, #1E3A8A 0%, #0A192F 100%);
  color: #FFFFFF;
  border-radius: var(--radius-lg);
  padding: 4rem 2rem;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.cta-banner h2 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.cta-banner p {
  font-size: 1.15rem;
  color: #93C5FD;
  max-width: 650px;
  margin: 0 auto 2rem auto;
}

/* --- Footer --- */
.site-footer {
  background-color: var(--primary-navy);
  color: #94A3B8;
  padding: 4rem 0 2rem 0;
  margin-top: auto;
  border-top: 1px solid #1E293B;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  margin-top: 1rem;
  font-size: 0.95rem;
  max-width: 360px;
  line-height: 1.6;
}

.footer-col h4 {
  color: #FFFFFF;
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 1.25rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.65rem;
}

.footer-links a {
  color: #94A3B8;
  font-size: 0.95rem;
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid #1E293B;
  text-align: center;
  font-size: 0.875rem;
  color: #64748B;
}

/* --- Responsive Media Queries --- */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2.5rem;
  }
  
  .hero-content h1 {
    font-size: 2.25rem;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 80px;
    left: 0;
    width: 100%;
    background-color: #FFFFFF;
    flex-direction: column;
    padding: 2rem 1.5rem;
    gap: 1.25rem;
    border-bottom: 1px solid var(--card-border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-150%);
    transition: transform 0.3s ease-in-out;
  }

  .nav-menu.open {
    transform: translateY(0);
  }

  .mobile-toggle {
    display: block;
  }

  .section {
    padding: 3.5rem 0;
  }

  .section-title {
    font-size: 1.85rem;
  }

  .bio-card, .work-model-card, .contact-form-card, .contact-info-panel {
    padding: 1.75rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}