/* ==========================================================================
   Layout System — TechPro SA
   Page structure, header, footer, hero, sections, grid
   ========================================================================== */

/* ---------- Skip Link ---------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 10000;
  padding: 0.5rem 1rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-sm);
  transition: top 0.2s;
}
.skip-link:focus {
  top: 0.5rem;
}

/* ---------- Site Container ---------- */
.site {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
}
.site-content {
  flex: 1 0 auto;
}

/* ---------- Container ---------- */
.container,
.techpro-container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-md);
}
.container--narrow {
  max-width: 800px;
}
.container--wide {
  max-width: 1440px;
}

/* ---------- Section ---------- */
.section {
  padding-block: var(--space-3xl);
}
.section--sm {
  padding-block: var(--space-xl);
}
.section--lg {
  padding-block: var(--space-4xl);
}
.section--alt {
  background: var(--color-neutral-50);
}
.section--dark {
  background: var(--color-neutral-900);
  color: var(--color-neutral-100);
}
.section--primary {
  background: var(--color-primary);
  color: #fff;
}
.section__header {
  text-align: center;
  max-width: 720px;
  margin-inline: auto;
  margin-bottom: var(--space-2xl);
}
.section__subtitle {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}
.section--dark .section__subtitle,
.section--primary .section__subtitle {
  color: var(--color-accent);
}
.section__title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-sm);
}
.section__desc {
  font-size: var(--text-md);
  color: var(--color-neutral-500);
  line-height: 1.7;
}
.section--dark .section__desc {
  color: var(--color-neutral-300);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-neutral-100);
  transition: box-shadow 0.3s ease;
}
.site-header.scrolled {
  box-shadow: var(--shadow-md);
}

/* Top Bar */
.header-topbar {
  background: var(--color-neutral-900);
  color: var(--color-neutral-300);
  font-size: var(--text-xs);
  padding-block: var(--space-2xs);
}
.header-topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
}
.topbar-left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}
.topbar-left a {
  color: var(--color-neutral-300);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
}
.topbar-left a:hover {
  color: #fff;
}
.topbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}
.topbar-social a {
  color: var(--color-neutral-400);
  transition: color 0.2s;
}
.topbar-social a:hover {
  color: #fff;
}

/* Main Header */
.header-main {
  padding-block: var(--space-sm);
}
.header-main .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

/* Logo */
.site-logo {
  flex-shrink: 0;
}
.site-logo a {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  text-decoration: none;
  color: var(--color-neutral-900);
}
.site-logo img {
  height: 44px;
  width: auto;
}
.site-logo__text {
  font-size: var(--text-xl);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.site-logo__tagline {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-neutral-500);
  display: block;
}

/* Navigation */
.main-navigation {
  flex: 1;
  display: flex;
  justify-content: center;
}
.main-navigation ul {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
  margin: 0;
  padding: 0;
}
.main-navigation li {
  position: relative;
}
.main-navigation a {
  display: block;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-neutral-700);
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: color 0.2s, background 0.2s;
}
.main-navigation a:hover,
.main-navigation .current-menu-item > a {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* Dropdown */
.main-navigation .sub-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 240px;
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-neutral-100);
  padding: var(--space-xs);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.25s ease;
  display: flex;
  flex-direction: column;
}
.main-navigation li:hover > .sub-menu,
.main-navigation li:focus-within > .sub-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.main-navigation .sub-menu a {
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
}

/* Header Actions */
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  flex-shrink: 0;
}

/* Mobile Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-xs);
  cursor: pointer;
  color: var(--color-neutral-700);
}
.menu-toggle .hamburger {
  width: 24px;
  height: 18px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.menu-toggle .hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: all 0.3s ease;
}
.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(2) {
  opacity: 0;
}
.menu-toggle[aria-expanded="true"] .hamburger span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ---------- Hero Sections ---------- */
.hero {
  position: relative;
  padding-block: var(--space-4xl);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #fff;
  overflow: hidden;
}
.hero--home {
  padding-block: 80px 100px;
  min-height: 560px;
  display: flex;
  align-items: center;
}
.hero__content {
  position: relative;
  z-index: 2;
  max-width: 640px;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  margin-bottom: var(--space-md);
  backdrop-filter: blur(4px);
}
.hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}
.hero__desc {
  font-size: var(--text-lg);
  opacity: 0.9;
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 1;
}
.hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.15;
}
.hero__pattern {
  position: absolute;
  top: -50%;
  right: -20%;
  width: 800px;
  height: 800px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.06) 0%, transparent 70%);
  z-index: 1;
}

/* Hero - Page */
.hero--page {
  padding-block: var(--space-3xl);
  text-align: center;
}
.hero--page .hero__title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
}

/* Hero - Service */
.hero--service {
  padding-block: var(--space-3xl);
}
.hero--service .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}
.hero__image {
  position: relative;
  z-index: 2;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}
.hero__image img {
  width: 100%;
  height: auto;
  display: block;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-neutral-900);
  color: var(--color-neutral-300);
}

/* Footer Main */
.footer-main {
  padding-block: var(--space-3xl);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: var(--space-2xl);
}
.footer-brand {
  max-width: 320px;
}
.footer-brand .site-logo__text {
  color: #fff;
  font-size: var(--text-lg);
}
.footer-brand p {
  margin-top: var(--space-sm);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-neutral-400);
}
.footer-social {
  display: flex;
  gap: var(--space-xs);
  margin-top: var(--space-md);
}
.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-neutral-400);
  transition: all 0.2s;
}
.footer-social a:hover {
  background: var(--color-primary);
  color: #fff;
}

/* Footer Columns */
.footer-col__title {
  font-size: var(--text-sm);
  font-weight: 700;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-md);
}
.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-col li + li {
  margin-top: var(--space-xs);
}
.footer-col a {
  font-size: var(--text-sm);
  color: var(--color-neutral-400);
  text-decoration: none;
  transition: color 0.2s;
}
.footer-col a:hover {
  color: #fff;
}

/* Footer Contact */
.footer-contact-item {
  display: flex;
  gap: var(--space-xs);
  margin-bottom: var(--space-sm);
  font-size: var(--text-sm);
}
.footer-contact-item svg {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  margin-top: 3px;
  color: var(--color-primary-light);
}

/* Footer Bottom */
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-block: var(--space-md);
}
.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-xs);
  color: var(--color-neutral-500);
}
.footer-bottom a {
  color: var(--color-neutral-400);
  text-decoration: none;
}
.footer-bottom a:hover {
  color: #fff;
}
.footer-legal {
  display: flex;
  gap: var(--space-md);
}

/* ---------- Grid Layouts ---------- */
.grid {
  display: grid;
  gap: var(--space-lg);
}
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--auto {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

/* ---------- Two Column Layout ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: center;
}
.two-col--reverse {
  direction: rtl;
}
.two-col--reverse > * {
  direction: ltr;
}

/* ---------- Sidebar Layout ---------- */
.layout-sidebar {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: var(--space-2xl);
}
.layout-sidebar--left {
  grid-template-columns: 340px 1fr;
}

/* ---------- Mobile Responsive ---------- */
@media (max-width: 1024px) {
  .header-topbar { display: none; }
  .main-navigation { display: none; }
  .menu-toggle { display: flex; }

  .main-navigation.is-open {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    border-top: 1px solid var(--color-neutral-100);
    box-shadow: var(--shadow-lg);
    padding: var(--space-md);
  }
  .main-navigation.is-open ul {
    flex-direction: column;
    gap: 0;
  }
  .main-navigation.is-open .sub-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: none;
    padding-left: var(--space-md);
  }

  .hero--service .container {
    grid-template-columns: 1fr;
  }
  .hero__image { order: -1; }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
  }
  .grid--3, .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
  .two-col {
    grid-template-columns: 1fr;
  }
  .layout-sidebar,
  .layout-sidebar--left {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .section { padding-block: var(--space-2xl); }
  .hero--home { padding-block: 48px 64px; min-height: auto; }

  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom .container {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
  .grid--2, .grid--3, .grid--4 {
    grid-template-columns: 1fr;
  }
}