/* ==========================================================================
   GLOBAL VARIABLES
   ========================================================================== */
:root, [data-theme="light"] {
  /* Typography */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  
  --font-display: 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Color Palette - Premium Logistics (Navy & Orange) */
  --color-bg: #f8fafc;
  --color-surface: #f1f5f9;
  --color-surface-2: #ffffff;
  --color-border: #e2e8f0;
  --color-divider: #cbd5e1;

  --color-text: #0f172a;
  --color-text-muted: #475569;
  --color-text-faint: #94a3b8;
  --color-text-inverse: #ffffff;

  --color-primary: #0A2540; /* Navy Blue */
  --color-primary-hover: #123456;
  --color-primary-active: #061829;
  --color-primary-soft: #e6eaf0;

  --color-accent: #ea580c; /* Dark Orange */
  --color-accent-hover: #c2410c;
  --color-accent-soft: #ffedd5;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(10, 37, 64, 0.05);
  --shadow-md: 0 10px 30px rgba(10, 37, 64, 0.08);
  --shadow-lg: 0 20px 60px rgba(10, 37, 64, 0.12);

  /* Layout */
  --content-default: 1120px;
  --content-wide: 1240px;
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-surface-2: #334155;
  --color-border: #475569;
  --color-divider: #334155;
  
  --color-text: #f8fafc;
  --color-text-muted: #cbd5e1;
  --color-text-faint: #94a3b8;
  --color-text-inverse: #0f172a;
  
  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-primary-active: #2563eb;
  --color-primary-soft: #1e3a8a;
  
  --color-accent: #f97316;
  --color-accent-hover: #fb923c;
  --color-accent-soft: #7c2d12;
  
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   RESET & BASE
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background:
    radial-gradient(circle at top right, rgba(10,37,64,0.04), transparent 26%),
    linear-gradient(180deg, var(--color-bg), var(--color-surface));
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; transition: color var(--transition-interactive); }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; border-radius: var(--radius-sm); }

/* Typography */
h1, h2, h3, h4, h5, h6 { font-family: var(--font-display); line-height: 1.1; letter-spacing: -0.02em; }
p { max-width: 72ch; }

/* Accessibility */
.skip-link {
  position: absolute; left: var(--space-4); top: -3rem; background: var(--color-accent);
  color: var(--color-text-inverse); padding: var(--space-2) var(--space-4); border-radius: var(--radius-full); z-index: 100;
}
.skip-link:focus { top: var(--space-4); }

/* ==========================================================================
   LAYOUT & GRID
   ========================================================================== */
.container { width: min(calc(100% - 2rem), var(--content-default)); margin-inline: auto; }
.section { padding-block: clamp(var(--space-12), 8vw, var(--space-24)); }

/* ==========================================================================
   COMPONENTS
   ========================================================================== */
/* Eyebrow / Tag */
.eyebrow {
  display: block; color: var(--color-accent);
  font-size: var(--text-sm); letter-spacing: 0.08em; text-transform: uppercase; font-weight: 700;
}

/* Section Head */
.section-head { margin-bottom: var(--space-10); max-width: 760px; }
.section-head .eyebrow { margin-bottom: var(--space-2); }
.section-head h2 { font-size: var(--text-xl); line-height: 1.3; margin-bottom: var(--space-3); }
.section-head p { color: var(--color-text-muted); line-height: 1.6; }

/* Buttons */
.btn {
  min-height: 46px; padding: 0.8rem 1.25rem; border-radius: var(--radius-full); display: inline-flex;
  align-items: center; justify-content: center; gap: var(--space-2); transition: all var(--transition-interactive);
  font-size: var(--text-sm); font-weight: 600; text-align: center;
}
.btn-primary { background: var(--color-accent); color: var(--color-text-inverse); box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--color-accent-hover); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-secondary {
  background: var(--color-surface-2); color: var(--color-primary); 
  border: 1px solid var(--color-border); box-shadow: var(--shadow-sm);
}
.btn-secondary:hover { background: var(--color-primary-soft); border-color: var(--color-primary-soft); }
.icon-btn {
  width: 46px; height: 46px; border-radius: 50%; border: 1px solid var(--color-border);
  background: var(--color-surface-2); display: inline-grid; place-items: center;
  color: var(--color-text); transition: background var(--transition-interactive);
}
.icon-btn:hover { background: var(--color-surface); }

/* Cards */
.card {
  background: var(--color-surface-2); border-radius: var(--radius-xl); padding: var(--space-6);
  border: 1px solid var(--color-border); box-shadow: var(--shadow-sm); transition: box-shadow var(--transition-interactive);
}
.card:hover { box-shadow: var(--shadow-md); }

/* Forms */
.field { display: grid; gap: var(--space-2); margin-bottom: var(--space-4); }
.field label { font-size: var(--text-xs); font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-text-muted); }
.field input, .field select {
  width: 100%; height: 50px; border-radius: var(--radius-md); padding: 0 1rem;
  border: 1px solid var(--color-border); background: var(--color-surface); 
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}
.field textarea {
  width: 100%; min-height: 110px; border-radius: var(--radius-md); padding: 0.9rem 1rem;
  border: 1px solid var(--color-border); background: var(--color-surface); 
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
  resize: vertical;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-soft);
  outline: none;
}

/* ==========================================================================
   HEADER
   ========================================================================== */
.site-header {
  position: sticky; top: 0; z-index: 50; backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--color-bg) 85%, transparent);
  border-bottom: 1px solid var(--color-border);
}
.nav-shell {
  display: flex; align-items: center; gap: var(--space-6);
  min-height: 80px;
}
.brand { display: flex; align-items: center; gap: var(--space-3); font-weight: 700; }
.brand-mark {
  width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--color-primary), #1a4a7a);
  color: white; box-shadow: var(--shadow-sm);
}
.brand-text strong { display: block; font-size: var(--text-sm); font-family: var(--font-display); letter-spacing: 0.02em; }
.brand-text span { display: block; font-size: var(--text-xs); color: var(--color-text-muted); font-weight: 400; }

.nav-links { display: flex; align-items: center; gap: var(--space-6); margin-right: auto; }
.nav-links a { font-size: var(--text-sm); color: var(--color-text-muted); font-weight: 500; }
.nav-links a:hover, .nav-links a.active { color: var(--color-primary); }

.nav-actions { display: flex; align-items: center; gap: var(--space-3); }
.mobile-toggle { display: none; }
.mobile-menu {
  display: none; flex-direction: column; gap: var(--space-4); padding-bottom: var(--space-5);
}
.mobile-menu[data-open="true"] { display: flex; }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  padding-block: var(--space-12) var(--space-8); border-top: 1px solid var(--color-border);
  background: var(--color-surface-2); margin-top: auto;
}
.footer-grid {
  display: grid; gap: var(--space-8); grid-template-columns: 1.5fr 0.8fr 0.8fr 1fr;
}
.footer-col { display: grid; gap: var(--space-3); align-content: start; }
.footer-col h3 { font-family: var(--font-body); font-size: var(--text-sm); text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-text); }
.footer-col a, .footer-col p { color: var(--color-text-muted); font-size: var(--text-sm); }
.footer-col a:hover { color: var(--color-accent); }
.footer-bottom {
  margin-top: var(--space-10); padding-top: var(--space-6); border-top: 1px solid var(--color-divider);
  display: flex; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap; 
  color: var(--color-text-muted); font-size: var(--text-sm);
}

/* ==========================================================================
   PAGE SPECIFIC (HOME)
   ========================================================================== */
.hero { padding-top: clamp(var(--space-8), 5vw, var(--space-16)); }
.hero-grid { display: grid; gap: var(--space-10); grid-template-columns: minmax(0, 1.1fr) minmax(340px, 0.9fr); align-items: center; }
.hero-copy { display: grid; gap: var(--space-5); }
.hero-copy h1 { font-size: var(--text-2xl); max-width: 15ch; color: var(--color-primary); }
[data-theme="dark"] .hero-copy h1 { color: var(--color-text); }
.hero-copy p { font-size: var(--text-lg); color: var(--color-text-muted); max-width: 45ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-2); }
.hero-form { border-top: 4px solid var(--color-accent); }
.hero-form h3 { margin-bottom: var(--space-4); font-size: var(--text-lg); }

.services-grid { display: grid; gap: var(--space-5); grid-template-columns: repeat(3, minmax(0, 1fr)); }
.service-card { display: grid; gap: var(--space-3); align-content: start; }
.service-card h3 { font-size: var(--text-lg); color: var(--color-primary); }
[data-theme="dark"] .service-card h3 { color: var(--color-text); }
.link-action { margin-top: auto; padding-top: var(--space-2); color: var(--color-accent); font-weight: 600; font-size: var(--text-sm); }
.link-action:hover { color: var(--color-accent-hover); }

.features-grid { display: grid; gap: var(--space-8); grid-template-columns: repeat(4, minmax(0, 1fr)); }
.feature-item { display: grid; gap: var(--space-3); }
.feature-icon { font-size: 2.5rem; width: 64px; height: 64px; display: grid; place-items: center; background: var(--color-bg); border-radius: var(--radius-lg); border: 1px solid var(--color-border); }
.feature-item h3 { font-size: var(--text-base); }
.feature-item p { font-size: var(--text-sm); color: var(--color-text-muted); }

/* FAQ Styles */
.faq-grid { display: grid; gap: var(--space-4); max-width: 800px; }
details.faq-item { background: var(--color-surface-2); border-radius: var(--radius-lg); padding: var(--space-5); border: 1px solid var(--color-border); transition: box-shadow var(--transition-interactive); }
details.faq-item:hover { box-shadow: var(--shadow-sm); }
summary.faq-question { font-weight: 600; font-size: var(--text-base); cursor: pointer; list-style: none; position: relative; padding-right: var(--space-6); }
summary.faq-question::-webkit-details-marker { display: none; }
summary.faq-question::after { content: '+'; position: absolute; right: 0; top: 0; font-size: 1.25rem; color: var(--color-accent); transition: transform 0.3s ease; }
details[open] summary.faq-question::after { transform: rotate(45deg); }
details[open] summary.faq-question { margin-bottom: var(--space-3); color: var(--color-primary); }
[data-theme="dark"] details[open] summary.faq-question { color: var(--color-text); }
details.faq-item p { color: var(--color-text-muted); font-size: var(--text-sm); margin-bottom: 0; }

/* ==========================================================================
   MEDIA QUERIES
   ========================================================================== */
@media (max-width: 1100px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero-grid { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 760px) {
  .nav-links, .nav-actions .btn-primary { display: none; }
  .mobile-toggle { display: inline-grid; }
  .container { width: min(calc(100% - 1.25rem), var(--content-default)); }
  .section { padding-block: var(--space-10); }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .services-grid, .features-grid { grid-template-columns: 1fr; }
  .hero-copy h1 { font-size: var(--text-xl); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}