/* =============================================
   Shared CSS — Dualz Solutions PSI/SI Generator
   ============================================= */

/* --- Custom Properties --- */
:root {
  --color-navy:       #0d1b2a;
  --color-navy-mid:   #162438;
  --color-navy-light: #1e3451;
  --color-accent:     #1a9bd8;
  --color-accent-hover: #1585bb;
  --color-light:      #f5f7fa;
  --color-white:      #ffffff;
  --color-text:       #1a2332;
  --color-text-muted: #5a6a7e;
  --color-border:     #dde2e8;
  --color-success:    #28a745;
  --color-error:      #dc3545;

  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'Courier New', Courier, monospace;

  --spacing-xs:  0.25rem;
  --spacing-sm:  0.5rem;
  --spacing-md:  1rem;
  --spacing-lg:  1.5rem;
  --spacing-xl:  2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,.10);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.14);

  --transition: 0.2s ease;
  --max-width: 1100px;
}

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

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

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

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

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

ul, ol { list-style: none; }

h1, h2, h3, h4, h5, h6 {
  line-height: 1.25;
  font-weight: 700;
  color: var(--color-text);
}

/* --- Utility --- */
.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;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--spacing-lg);
}

.text-center { text-align: center; }
.text-muted  { color: var(--color-text-muted); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  text-decoration: none;
}
.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.btn-outline:hover {
  background: var(--color-accent);
  color: var(--color-white);
}

.btn-ghost {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.5);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.12);
  border-color: var(--color-white);
}

.btn-lg { padding: 0.85rem 2rem; font-size: 1.05rem; }

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-navy);
  box-shadow: 0 2px 8px rgba(0,0,0,.25);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  display: flex;
  align-items: baseline;
  gap: 0.25rem;
  text-decoration: none;
}

.logo-mark {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: -0.5px;
}

.logo-sub {
  font-size: 0.85rem;
  font-weight: 400;
  color: rgba(255,255,255,0.55);
}

/* Desktop nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-list {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255,255,255,0.75);
  transition: color var(--transition);
  text-decoration: none;
}
.nav-link:hover,
.nav-link.is-active {
  color: var(--color-white);
  text-decoration: none;
}

.nav-cta { font-size: 0.875rem; padding: 0.5rem 1.1rem; }

/* Mobile toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --- Section helpers --- */
.section { padding: var(--spacing-3xl) 0; }
.section-light { background: var(--color-light); }
.section-navy { background: var(--color-navy); color: var(--color-white); }
.section-navy h1,
.section-navy h2,
.section-navy h3 { color: var(--color-white); }

.section-header { margin-bottom: var(--spacing-2xl); }
.section-header h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
.section-header p { margin-top: var(--spacing-sm); font-size: 1.05rem; color: var(--color-text-muted); }

/* --- Cards --- */
.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
}

.card-grid {
  display: grid;
  gap: var(--spacing-lg);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

/* --- Footer --- */
.site-footer {
  background: var(--color-navy);
  color: rgba(255,255,255,0.8);
  padding-top: var(--spacing-3xl);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-2xl);
  padding-bottom: var(--spacing-2xl);
}

.footer-brand .logo-mark { font-size: 1.1rem; }
.footer-tagline { margin-top: var(--spacing-sm); font-size: 0.875rem; color: rgba(255,255,255,0.55); line-height: 1.5; }

.footer-nav ul { display: flex; flex-direction: column; gap: var(--spacing-sm); }
.footer-nav a, .footer-address a {
  color: rgba(255,255,255,0.7);
  font-size: 0.875rem;
  text-decoration: none;
  transition: color var(--transition);
}
.footer-nav a:hover, .footer-address a:hover { color: var(--color-white); }

.footer-address { font-style: normal; font-size: 0.875rem; line-height: 1.8; color: rgba(255,255,255,0.7); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: var(--spacing-md) 0;
}
.footer-bottom p { font-size: 0.8rem; color: rgba(255,255,255,0.4); }

/* --- Forms --- */
.form-group { display: flex; flex-direction: column; gap: var(--spacing-xs); }
.form-group label { font-size: 0.875rem; font-weight: 600; color: var(--color-text); }

.form-control {
  width: 100%;
  padding: 0.65rem 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-text);
  background: var(--color-white);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-control:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(26,155,216,.15);
}
.form-control:invalid:not(:placeholder-shown) { border-color: var(--color-error); }

textarea.form-control { resize: vertical; min-height: 120px; }

.form-alert {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-size: 0.925rem;
}
.form-alert-success { background: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.form-alert-error   { background: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }

/* --- Badge --- */
.badge {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.badge-accent { background: var(--color-accent); color: var(--color-white); }
.badge-outline { border: 1.5px solid var(--color-accent); color: var(--color-accent); }

/* --- Reveal animation --- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .main-nav {
    position: absolute;
    top: 64px;
    left: 0; right: 0;
    background: var(--color-navy-mid);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
    box-shadow: 0 8px 24px rgba(0,0,0,.3);
  }
  .main-nav[hidden] { display: none; }
  .main-nav:not([hidden]) { display: flex; }

  .nav-list { flex-direction: column; gap: var(--spacing-sm); width: 100%; }
  .nav-link { font-size: 1rem; }
  .nav-cta { width: 100%; text-align: center; }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }
}