/* reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; background: #1e1e2f; color: #ffffff; line-height: 1.6; min-height: 100vh; }
a { color: #1a73e8; text-decoration: none; transition: color 0.2s; }
a:hover, a:focus-visible { color: #ff6d01; }
:focus-visible { outline: 2px solid #ff6d01; outline-offset: 2px; }
ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; }

/* CSS Variables */
:root {
  --color-primary: #1a73e8;
  --color-secondary: #ff6d01;
  --color-bg-dark: #1e1e2f;
  --color-bg-light: #f4f6fa;
  --color-text-primary: #ffffff;
  --color-text-secondary: #b0b8c1;
  --color-card-bg: #2a2a3e;
  --color-border: rgba(255,255,255,0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Menlo, Monaco, "Cascadia Code", "JetBrains Mono", Consolas, monospace;
  --font-weight-bold: 700;
  --font-weight-regular: 400;
  --header-height: 60px;
  --content-max-width: 1200px;
  --gutter: 1.5rem;
}

/* skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  background: var(--color-secondary);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 1000;
  font-weight: var(--font-weight-bold);
  transition: top 0.2s;
}
.skip-link:focus { top: 0; outline: none; }

/* header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(30,30,47,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: var(--header-height);
}
.brand-link {
  font-size: 1.4rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
.brand-link:hover,
.brand-link:focus-visible { color: var(--color-primary); }
.brand {
  /* no extra style needed */
}
/* nav toggle (mobile) */
.nav-toggle {
  display: none; /* shown on mobile */
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  width: 44px;
  height: 44px;
  position: relative;
}
.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  position: absolute;
  left: 10px;
  transition: all 0.3s ease;
}
.nav-toggle-icon { top: 50%; transform: translateY(-50%); }
.nav-toggle-icon::before { top: -8px; }
.nav-toggle-icon::after { top: 8px; }
/* aria-expanded true transforms to X */
[data-nav-toggle][aria-expanded="true"] .nav-toggle-icon { background: transparent; }
[data-nav-toggle][aria-expanded="true"] .nav-toggle-icon::before { top: 0; transform: rotate(45deg); }
[data-nav-toggle][aria-expanded="true"] .nav-toggle-icon::after { top: 0; transform: rotate(-45deg); }

/* nav container */
.nav { display: flex; align-items: center; }
.nav-list {
  display: flex;
  gap: 0.2rem;
}
.nav-link {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 100px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}
.nav-link:hover,
.nav-link:focus-visible {
  background: rgba(255,255,255,0.08);
  color: var(--color-text-primary);
}
.nav-link[aria-current="page"] {
  background: var(--color-primary);
  color: #fff;
  font-weight: var(--font-weight-bold);
}

/* progress bar */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  width: 0%;
  z-index: 200;
  pointer-events: none;
  transition: width 0.1s linear;
}
@media (prefers-reduced-motion: reduce) {
  .progress-bar { display: none; }
}

/* footer */
.site-footer {
  background: #151525;
  border-top: 1px solid var(--color-border);
  padding: 3rem var(--gutter) 1.5rem;
}
.footer-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 2rem;
}
.footer-brand { grid-column: 1 / -1; }
.footer-brand-link {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}
.footer-brand-link:hover { color: var(--color-primary); }
.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.footer-links a {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
}
.footer-links a:hover { color: var(--color-secondary); }
.footer-contact p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.8;
}
.footer-contact a { color: var(--color-text-secondary); }
.footer-contact a:hover { color: var(--color-primary); }
.trust-statement {
  grid-column: 1 / -1;
  color: var(--color-text-secondary);
  font-size: 0.8rem;
  text-align: center;
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
  margin-top: 1rem;
}
.footer-icp {
  grid-column: 1 / -1;
  text-align: center;
  color: #666;
  font-size: 0.8rem;
  margin-top: 0.5rem;
}

/* responsive */
@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav {
    position: absolute;
    top: var(--header-height);
    left: 0; right: 0;
    background: var(--color-bg-dark);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem var(--gutter);
    display: none;
    flex-direction: column;
  }
  .nav[data-open] { display: flex; }
  .nav-list {
    flex-direction: column;
    gap: 0.5rem;
  }
  .nav-link {
    display: block;
    text-align: center;
    padding: 0.8rem 1rem;
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  .footer-links { order: 1; }
  .footer-contact { order: 2; }
  .footer-brand { text-align: center; }
}
@media (min-width: 769px) and (max-width: 1024px) {
  .header-inner { padding: 0 1rem; }
  .nav-link { font-size: 0.85rem; padding: 0.4rem 0.8rem; }
}

/* utility: main content area */
.main-content {
  min-height: 60vh;
  padding: 2rem var(--gutter);
  max-width: var(--content-max-width);
  margin: 0 auto;
}

/* generic button */
.btn {
  display: inline-block;
  background: var(--color-primary);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 100px;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
}
.btn:hover, .btn:focus-visible {
  background: var(--color-secondary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255,109,1,0.3);
}
.btn:active { transform: translateY(0); }

/* scroll reveal (used by JS) */
[data-observe] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-observe].fade-in {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  [data-observe],
  [data-observe].fade-in {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* image placeholder base (for pages) */
.img-container {
  position: relative;
  overflow: hidden;
  background: var(--color-card-bg);
  border-radius: 8px;
}
.img-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* basic card */
.card {
  background: var(--color-card-bg);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  transition: box-shadow 0.3s, transform 0.3s;
}
.card:hover {
  box-shadow: 0 6px 20px rgba(0,0,0,0.4);
  transform: translateY(-4px);
}

/* breadcrumb (generic) */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}
.breadcrumb a { color: var(--color-text-secondary); }
.breadcrumb a:hover { color: var(--color-secondary); }
.breadcrumb [aria-current="page"] { color: var(--color-text-primary); }

/* grid helper (pages can extend) */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}