/* ==========================================================================
   SRIN AVIATION LLC - Clean Light Theme & Mobile Responsive CSS
   ========================================================================== */

:root {
  --bg-primary: #FFFFFF;
  --bg-alt: #F8FAFC;
  --bg-card: #FFFFFF;
  
  --text-dark: #0F172A;
  --text-body: #475569;
  --text-muted: #64748B;
  
  --primary: #0284C7;
  --primary-hover: #0369A1;
  --primary-light: #E0F2FE;
  
  --border-color: #E2E8F0;
  --border-hover: #CBD5E1;
  
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
  
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Global Settings */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  scroll-behavior: smooth;
}

body.light-theme {
  background-color: var(--bg-primary);
  color: var(--text-body);
  font-family: var(--font-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  padding: 0.75rem 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--text-dark);
}

/* SRIN Logo Image */
.brand-logo-img {
  height: 48px;
  width: auto;
  object-fit: contain;
  border-radius: var(--radius-sm);
  display: block;
}

.brand-title {
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.3px;
}

.brand-sub {
  color: var(--primary);
}

.brand-loc {
  display: block;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-weight: 500;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-links a {
  color: var(--text-body);
  font-size: 0.95rem;
  font-weight: 500;
}

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

/* Mobile Toggle Button */
.mobile-toggle {
  display: none;
  background: var(--bg-alt);
  border: 1px solid var(--border-color);
  color: var(--text-dark);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.mobile-menu {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1rem 1.5rem 1.5rem;
  background: #FFFFFF;
  border-bottom: 1px solid var(--border-color);
}

.mobile-menu a {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-dark);
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--bg-alt);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
}

.btn-primary {
  background: var(--primary);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: var(--primary-hover);
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
}

.btn-outline {
  background: #FFFFFF;
  border-color: var(--border-color);
  color: var(--text-dark);
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--bg-alt);
}

.btn-sm {
  padding: 0.45rem 0.95rem;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1.05rem;
}

.btn-full {
  width: 100%;
}

.mt-1 { margin-top: 0.5rem; }

/* Hero Section */
.hero {
  padding: 4.5rem 0 4rem;
  background: linear-gradient(180deg, #FFFFFF 0%, var(--bg-alt) 100%);
  border-bottom: 1px solid var(--border-color);
}

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

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 1.25rem;
  letter-spacing: 0.5px;
}

.hero-content h1 {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--text-dark);
  line-height: 1.15;
  margin-bottom: 1.25rem;
  letter-spacing: -0.5px;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-body);
  margin-bottom: 2rem;
}

.key-metrics {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2.25rem;
  padding: 1.25rem;
  background: #FFFFFF;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.metric-item {
  display: flex;
  flex-direction: column;
}

.metric-num {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-dark);
}

.metric-lbl {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.metric-divider {
  width: 1px;
  height: 35px;
  background: var(--border-color);
}

.hero-actions {
  display: flex;
  gap: 1rem;
}

/* Attached Image Frame */
.image-card {
  background: #FFFFFF;
  padding: 8px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
}

.image-card img {
  width: 100%;
  height: 340px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  display: block;
}

.image-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 0.5rem 0.25rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.image-label i {
  color: #10B981;
}

/* Sections Core */
.section {
  padding: 5rem 0;
}

.bg-alt {
  background-color: var(--bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-header h2 {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 0.75rem;
  letter-spacing: -0.5px;
}

.section-header p {
  font-size: 1.1rem;
  color: var(--text-body);
  max-width: 650px;
  margin: 0 auto;
}

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

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.feature-card {
  background: #FFFFFF;
  padding: 2rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

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

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 1.25rem;
}

.feature-card h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 0.5rem;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-body);
}

/* Specs Table */
.specs-card {
  max-width: 900px;
  margin: 0 auto;
  background: #FFFFFF;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  overflow-x: auto;
}

.specs-table {
  width: 100%;
  border-collapse: collapse;
}

.specs-table td {
  padding: 1.1rem 1.75rem;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.95rem;
}

.specs-table tr:last-child td {
  border-bottom: none;
}

.specs-table tr:nth-child(even) {
  background: var(--bg-alt);
}

.specs-table td:first-child {
  color: var(--text-dark);
  font-weight: 600;
  width: 38%;
}

.specs-table td:last-child {
  color: var(--text-body);
}

/* Applications Grid */
.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.app-box {
  background: #FFFFFF;
  padding: 1.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.app-icon {
  width: 36px;
  height: 36px;
  color: var(--primary);
  margin-bottom: 1rem;
}

.app-box h4 {
  font-size: 1.1rem;
  color: var(--text-dark);
  margin-bottom: 0.5rem;
}

.app-box p {
  font-size: 0.9rem;
  color: var(--text-body);
}

/* Contact Section */
.contact-container {
  max-width: 800px;
}

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

.contact-details {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin: 2rem 0;
  padding: 1.25rem;
  background: var(--bg-alt);
  border-radius: var(--radius-md);
}

.detail-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
}

.detail-item i {
  color: var(--primary);
  margin-top: 3px;
}

.detail-item strong {
  display: block;
  font-size: 0.85rem;
  color: var(--text-dark);
}

.detail-item p {
  font-size: 0.9rem;
  color: var(--text-body);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dark);
}

.form-input {
  width: 100%;
  padding: 0.8rem 1rem;
  background: #FFFFFF;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-dark);
  font-family: var(--font-main);
  font-size: 0.95rem;
  outline: none;
  transition: var(--transition);
}

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

textarea.form-input {
  resize: vertical;
}

.success-banner {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem;
  background: #ECFDF5;
  border: 1px solid #A7F3D0;
  border-radius: var(--radius-md);
  margin-top: 1.5rem;
}

.success-banner i {
  color: #059669;
}

.success-banner h4 {
  color: #065F46;
  font-size: 1rem;
  margin-bottom: 0.25rem;
}

.success-banner p {
  color: #047857;
  font-size: 0.9rem;
}

.hidden { display: none !important; }

/* Footer */
.footer {
  background: #0F172A;
  color: #94A3B8;
  padding: 3rem 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.footer-logo-img {
  height: 48px;
  width: auto;
  border-radius: var(--radius-sm);
}

.footer-info strong {
  color: #FFFFFF;
  font-size: 1.1rem;
}

.footer-info p {
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

.footer-info a {
  color: #38BDF8;
}

.footer-copy {
  font-size: 0.85rem;
}

/* ==========================================================================
   Mobile Responsiveness (Targeted for 320px - 768px viewports)
   ========================================================================== */
@media (max-width: 850px) {
  .nav-links { display: none; }
  .mobile-toggle { display: block; }
  
  .hero { padding: 3rem 0 2.5rem; }
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero-content h1 { font-size: 2.1rem; }
  .hero-desc { font-size: 1rem; margin-bottom: 1.5rem; }
  
  .key-metrics { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .metric-divider { display: none; }
  
  .hero-actions { flex-direction: column; width: 100%; }
  .hero-actions .btn { width: 100%; }
  
  .image-card img { height: 240px; }
  
  .section { padding: 3.5rem 0; }
  .section-header { margin-bottom: 2.5rem; }
  .section-header h2 { font-size: 1.75rem; }
  
  .specs-table td { padding: 0.9rem 1rem; font-size: 0.85rem; }
  .specs-table td:first-child { width: 45%; }
  
  .contact-card { padding: 1.75rem 1.25rem; }
  .contact-details, .form-row { grid-template-columns: 1fr; gap: 1rem; }
  
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 1.5rem; }
}