/* ===================================================
   The Cornerstone — Design System
   Light, professional, corporate layout
   =================================================== */

/* === CSS Custom Properties === */
:root {
  /* Colors - Light Corporate Theme */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc; /* Very light slate */
  --color-bg-card: #ffffff;
  
  --color-primary: #0f2e53; /* Deep navy */
  --color-primary-light: #1a437a;
  --color-accent: #0f2e53; /* Deep navy */
  --color-accent-hover: #1a437a;
  
  --color-text-primary: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #64748b;
  
  --color-border: #e2e8f0;
  --color-border-hover: #cbd5e1;

  /* Typography */
  --font-heading: 'Inter', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;

  /* Layout */
  --max-width: 1200px;
  --border-radius: 4px; /* Squarer borders for corporate feel */
  --border-radius-sm: 2px;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
}

/* === Reset & Base === */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font-body); background-color: var(--color-bg-primary); color: var(--color-text-primary); line-height: 1.6; overflow-x: hidden; }
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-accent-hover); }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); font-weight: 700; line-height: 1.15; color: var(--color-text-primary); letter-spacing: -0.02em; }
ul { list-style: none; }

/* === Utility Classes === */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-md); }
.section { padding: var(--space-3xl) 0; }
.bg-secondary { background-color: var(--color-bg-secondary); }
.section-label { font-size: 0.8rem; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--color-accent); margin-bottom: var(--space-sm); display: block; }
.section-title { font-size: clamp(2rem, 4vw, 2.75rem); margin-bottom: var(--space-md); }
.section-subtitle { font-size: 1.125rem; color: var(--color-text-secondary); max-width: 600px; line-height: 1.7; }
.text-center { text-align: center; }
.text-center .section-subtitle { margin: 0 auto; }

/* Scroll Reveal */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.8s ease, transform 0.8s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.15s; }
.reveal-delay-2 { transition-delay: 0.3s; }
.reveal-delay-3 { transition-delay: 0.45s; }

/* === Navigation === */
.navbar { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; padding: var(--space-md) 0; transition: all var(--transition-base); background: var(--color-bg-primary); border-bottom: 1px solid transparent; }
.navbar.scrolled { padding: var(--space-sm) 0; border-bottom: 1px solid var(--color-border); box-shadow: var(--shadow-sm); }
.navbar .container { display: flex; align-items: center; justify-content: space-between; }
.nav-logo { display: flex; align-items: center; gap: var(--space-sm); color: var(--color-text-primary); }
.nav-logo svg { color: var(--color-text-primary); }
.nav-logo-text-group { display: flex; flex-direction: column; }
.nav-logo-text { font-family: var(--font-heading); font-size: 1.25rem; font-weight: 800; color: var(--color-text-primary); letter-spacing: 0px; line-height: 1.1; }
.nav-logo-subtext { font-family: var(--font-body); font-size: 0.65rem; color: var(--color-text-secondary); letter-spacing: 0.5px; }
.nav-links { display: flex; align-items: center; gap: 1.25rem; }
.nav-links a { font-size: 0.85rem; font-weight: 600; color: var(--color-text-primary); transition: color var(--transition-fast); text-transform: uppercase; }
.nav-links a:hover { color: var(--color-accent); }
.nav-divider { color: var(--color-text-primary); font-size: 1rem; font-weight: 300; }
.nav-icon-btn { display: flex !important; align-items: center; justify-content: center; width: 36px; height: 36px; background: var(--color-primary) !important; color: white !important; border-radius: 4px; padding: 0 !important; }
.nav-icon-btn:hover { background: var(--color-primary-light) !important; }

/* Mobile Menu Toggle */
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 4px; background: none; border: none; }
.nav-toggle span { width: 24px; height: 2px; background: var(--color-primary); border-radius: 2px; transition: all var(--transition-fast); }
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* === Hero Section (Split Layout) === */
.hero { min-height: 100vh; padding-top: 100px; display: flex; align-items: center; background: var(--color-bg-primary); }
.hero-split { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2xl); align-items: center; }
.hero-content { max-width: 600px; }
.hero-title { font-size: clamp(2.5rem, 4vw, 3.5rem); margin-bottom: var(--space-md); line-height: 1.1; letter-spacing: -1px; }
.hero-title .highlight { color: var(--color-accent); }
.hero-description { font-size: 1.05rem; color: var(--color-text-primary); margin-bottom: var(--space-lg); line-height: 1.6; }
.hero-actions { display: flex; align-items: center; gap: var(--space-md); margin-bottom: var(--space-sm); }
.hero-subtext { font-size: 0.85rem; color: var(--color-text-primary); }

.hero-image-wrapper { position: relative; border-radius: 8px; overflow: hidden; box-shadow: var(--shadow-lg); height: 75vh; }
.hero-img { width: 100%; height: 100%; object-fit: cover; object-position: center 20%; aspect-ratio: auto; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-xs); padding: 0.875rem 1.5rem; border-radius: 2px; font-weight: 600; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.5px; cursor: pointer; border: 1.5px solid transparent; transition: all var(--transition-fast); }
.btn-primary { background: var(--color-primary); color: white; border-color: var(--color-primary); }
.btn-primary:hover { background: var(--color-primary-light); border-color: var(--color-primary-light); color: white; box-shadow: var(--shadow-md); }
.btn-outline { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn-outline:hover { background: var(--color-bg-secondary); }
.btn-full { width: 100%; }

/* === About Section === */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2xl); align-items: center; }
.about-image { border-radius: var(--border-radius); overflow: hidden; box-shadow: var(--shadow-md); }
.about-image img { width: 100%; height: auto; display: block; }
.about-content .section-subtitle { margin-bottom: var(--space-lg); }
.about-highlights { display: flex; flex-direction: column; gap: var(--space-lg); }
.about-highlight { display: flex; align-items: flex-start; gap: var(--space-md); }
.about-highlight-icon { width: 48px; height: 48px; min-width: 48px; background: var(--color-bg-secondary); border-radius: var(--border-radius); display: flex; align-items: center; justify-content: center; color: var(--color-accent); }
.about-highlight h3 { font-size: 1.1rem; margin-bottom: 4px; }
.about-highlight p { font-size: 0.95rem; color: var(--color-text-secondary); line-height: 1.5; }

/* === Services Section === */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-lg); margin-top: var(--space-xl); }
.service-card { background: var(--color-bg-card); padding: var(--space-xl) var(--space-lg); border-radius: var(--border-radius); border: 1px solid var(--color-border); box-shadow: var(--shadow-sm); transition: all var(--transition-base); text-align: left; }
.service-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); border-color: var(--color-border-hover); }
.service-card-icon { color: var(--color-accent); margin-bottom: var(--space-md); }
.service-card h3 { font-size: 1.25rem; margin-bottom: var(--space-sm); }
.service-card p { font-size: 0.95rem; color: var(--color-text-secondary); margin-bottom: var(--space-lg); }
.service-card-link { font-weight: 600; color: var(--color-primary); font-size: 0.9rem; }
.service-card-link:hover { color: var(--color-accent); }

/* === Contact Section === */
.contact-split { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2xl); align-items: start; }
.contact-details { margin-top: var(--space-xl); display: flex; flex-direction: column; gap: var(--space-md); }
.contact-item { border-left: 3px solid var(--color-border); padding-left: var(--space-md); }
.contact-item strong { display: block; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 1px; color: var(--color-text-muted); margin-bottom: 4px; }
.contact-item span { font-weight: 500; color: var(--color-text-primary); font-size: 1.1rem; }

.contact-form-card { background: var(--color-bg-card); padding: var(--space-xl); border-radius: var(--border-radius); border: 1px solid var(--color-border); box-shadow: var(--shadow-md); }
.form-group { margin-bottom: var(--space-md); }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--color-text-primary); margin-bottom: 8px; }
.form-group input, .form-group textarea { width: 100%; padding: 0.75rem 1rem; border: 1px solid var(--color-border); border-radius: var(--border-radius-sm); font-family: var(--font-body); font-size: 1rem; transition: border-color var(--transition-fast); }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1); }

/* === Footer === */
.footer { background: var(--color-bg-primary); padding: var(--space-xl) 0 var(--space-md); border-top: 1px solid var(--color-border); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr; gap: var(--space-xl); margin-bottom: var(--space-xl); }
.footer-brand p { color: var(--color-text-secondary); margin-top: var(--space-sm); font-size: 0.95rem; }
.footer-links h4 { font-size: 0.9rem; text-transform: uppercase; letter-spacing: 1px; color: var(--color-text-muted); margin-bottom: var(--space-md); }
.footer-links a { display: block; color: var(--color-text-secondary); margin-bottom: var(--space-sm); font-size: 0.95rem; }
.footer-links a:hover { color: var(--color-primary); }
.footer-bottom { border-top: 1px solid var(--color-border); padding-top: var(--space-md); display: flex; justify-content: space-between; align-items: center; font-size: 0.85rem; color: var(--color-text-muted); flex-wrap: wrap; gap: var(--space-sm); }
.back-link { color: var(--color-accent); font-weight: 500; }

/* Responsive adjustments */
@media (max-width: 992px) {
  .hero-split, .about-grid, .contact-split { grid-template-columns: 1fr; gap: var(--space-xl); }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .hero { padding-top: 120px; padding-bottom: 60px; min-height: auto; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-links { position: fixed; top: 70px; left: 0; width: 100%; background: var(--color-bg-primary); flex-direction: column; padding: var(--space-xl); border-bottom: 1px solid var(--color-border); box-shadow: var(--shadow-md); transform: translateY(-150%); transition: transform 0.3s ease; z-index: -1; }
  .nav-links.active { transform: translateY(0); }
  .services-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; width: 100%; }
  .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}