/* ============================================================
   LAYOUT.CSS — Site Structure & Page Layout
   ============================================================ */

/* ── Site Wrapper ──────────────────────────────────────────── */
.site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: clip; /* contain decorative gradient bleed */
}

#app {
  flex: 1;
}

/* ── Container ─────────────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container--wide {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ── Header ────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 8px rgba(0,0,0,.06);
  transition: background-color var(--transition), border-color var(--transition);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.875rem;
  padding-bottom: 0.875rem;
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  flex-shrink: 0;
}

.site-logo__icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #ef4444, #b91c1c);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: white;
  font-weight: 700;
  font-family: 'DM Mono', monospace;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.4);
  flex-shrink: 0;
}

.site-logo__text {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
  transition: color var(--transition);
}

.site-logo:hover .site-logo__text { color: var(--color-accent); }

/* Nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav__item {
  position: relative;
}

.site-nav__link {
  padding: 0.45rem 0.875rem;
  border-radius: var(--radius-btn);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.site-nav__link:hover,
.site-nav__link.active {
  background: var(--color-accent-light);
  color: var(--color-accent);
}

.site-nav__dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-btn);
  padding: 0.35rem 0.4rem;
  min-width: 200px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  z-index: 100;
  display: flex;
  flex-direction: column;
}

.site-nav__item:hover .site-nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.site-nav__drop-link {
  padding: 0.5rem 0.75rem;
  display: block;
  font-size: 0.9rem;
  color: var(--color-text);
  text-decoration: none;
  border-radius: var(--radius-btn);
  transition: background var(--transition), color var(--transition);
}

.site-nav__drop-link:hover,
.site-nav__drop-link.active {
  background: var(--color-bg);
  color: var(--color-accent);
}

/* Header Actions */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text);
  cursor: pointer;
  padding: 0.25rem;
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  
  .site-nav {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--color-surface);
    padding: 1rem;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    border-top: 1px solid var(--color-border);
    z-index: 100;
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav__item {
    width: 100%;
  }
  
  .site-nav__link {
    width: 100%;
    justify-content: space-between;
  }

  .site-nav__dropdown {
    position: static;
    transform: none;
    box-shadow: none;
    border: none;
    opacity: 0;
    visibility: hidden;
    display: none;
    padding-left: 1rem;
    background: transparent;
    padding-top: 0;
    padding-bottom: 0;
  }

  .site-nav__item:hover .site-nav__dropdown,
  .site-nav__item.is-active .site-nav__dropdown {
    display: flex;
    opacity: 1;
    visibility: visible;
    margin-top: 0.5rem;
    transform: none;
  }
}

/* ── Hero Section ──────────────────────────────────────────── */
.hero {
  padding: 5rem 0 3.5rem;
  background: linear-gradient(160deg,
    var(--color-bg) 0%,
    var(--color-surface) 50%,
    var(--color-bg) 100%);
  text-align: center;
  position: relative;
  /* overflow: visible — allows search dropdown to float above next section */
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% -20%, rgba(26,115,232,.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(124,58,237,.08), transparent);
  pointer-events: none;
  /* z-index below search dropdown */
  z-index: 0;
}

/* Ensure search area sits above the hero ::before overlay */
.hero .container {
  position: relative;
  z-index: 1;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.35rem 0.875rem;
  border-radius: 99px;
  margin-bottom: 1.25rem;
}

.hero__title {
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  max-width: 540px;
  margin: 0 auto 2rem;
}

/* ── Main Content Area ─────────────────────────────────────── */
.main-content {
  padding: 3rem 0;
}

/* ── Category Grid ─────────────────────────────────────────── */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--color-border);
  margin-left: 0.5rem;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin-bottom: 3rem;
}

/* ── Two-col layout (calc + sidebar) ──────────────────────── */
.calc-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 1.5rem;
  align-items: start;
  padding: 2.5rem 0;
}

.calc-layout--wide {
  grid-template-columns: 1fr;
  max-width: 640px;
  margin: 0 auto;
  padding: 2.5rem 0;
}

/* ── Page header (calc pages) ──────────────────────────────── */
.page-header {
  padding: 2.5rem 0 0;
}

.page-header__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.page-header__breadcrumb a {
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.page-header__breadcrumb a:hover { color: var(--color-accent); }

.page-header__title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.page-header__desc {
  color: var(--color-text-muted);
  font-size: 1rem;
  max-width: 600px;
}

/* ── Footer ────────────────────────────────────────────────── */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 2rem 0;
  margin-top: auto;
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.site-footer__info {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.site-footer__copy {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.site-footer__contact {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

.site-footer__mail-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition), opacity var(--transition);
}

.site-footer__mail-link:hover {
  text-decoration: underline;
  opacity: 0.9;
}

.site-footer__links {
  display: flex;
  gap: 1.25rem;
}

.site-footer__links a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.site-footer__links a:hover { color: var(--color-accent); }

/* ── Home Grid ─────────────────────────────────────────────── */
.home-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 860px) {
  .home-grid {
    grid-template-columns: 1fr;
  }
}

/* ── Route Transition ──────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.page-enter {
  animation: fadeIn 0.28s cubic-bezier(.22,.68,0,1.2) both;
}

/* ── Loading Spinner ───────────────────────────────────────── */
.spinner {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem;
}

.spinner__ring {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── 404 ───────────────────────────────────────────────────── */
.not-found {
  text-align: center;
  padding: 6rem 1.5rem;
}

.not-found__code {
  font-size: 6rem;
  font-weight: 700;
  font-family: 'DM Mono', monospace;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 0.5rem;
  opacity: 0.6;
}

.not-found__title {
  font-size: 1.75rem;
  margin-bottom: 0.75rem;
}

.not-found__desc {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .calc-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .hero {
    padding: 3rem 0 2rem;
  }

  .category-grid {
    grid-template-columns: 1fr;
  }

  .site-footer .container {
    flex-direction: column;
    text-align: center;
    align-items: center;
  }

  .site-footer__contact {
    justify-content: center;
  }

  .site-footer__links {
    justify-content: center;
    flex-wrap: wrap;
  }

  .site-nav__link {
    padding: 0.4rem 0.6rem;
    font-size: 0.85rem;
  }
}