/* layout.css - Navigation, Footer, Grid System, Page Structure */

/* ========================================
   CONTAINER
   ======================================== */

.container {
  width: 100%;
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

@media (min-width: 640px) {
  .container { padding: 0 var(--spacing-6); }
}

@media (min-width: 1024px) {
  .container { padding: 0 var(--spacing-8); }
}

/* ========================================
   NAVIGATION
   ======================================== */

.nav {
  position: fixed;
  width: 100%;
  z-index: var(--z-fixed);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

@media (min-width: 640px) {
  .nav-inner { padding: 0 var(--spacing-6); }
}

@media (min-width: 1024px) {
  .nav-inner { padding: 0 var(--spacing-8); }
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.nav-logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(to bottom right, var(--color-blue-500), var(--color-cyan-400));
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.2);
}

.nav-logo-icon svg {
  width: 20px;
  height: 20px;
  color: white;
}

.nav-logo-text {
  font-weight: var(--font-bold);
  font-size: var(--text-lg);
  letter-spacing: -0.025em;
  color: var(--color-text-primary);
}

.nav-logo-text .accent {
  color: var(--color-blue-400);
}

/* Nav Links */
.nav-links {
  display: none;
  gap: var(--spacing-8);
}

@media (min-width: 768px) {
  .nav-links { display: flex; }
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-accent);
}

/* Nav Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-4);
}

/* Mobile Menu Button */
.nav-mobile-toggle {
  display: flex;
  padding: var(--spacing-2);
  background: transparent;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
}

@media (min-width: 768px) {
  .nav-mobile-toggle { display: none; }
}

.nav-mobile-toggle svg {
  width: 24px;
  height: 24px;
}

/* Mobile Menu */
.nav-mobile {
  display: none;
  position: fixed;
  top: 80px;
  left: 0;
  right: 0;
  background: var(--color-bg-secondary);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  padding: var(--spacing-6);
  z-index: var(--z-fixed);
}

.nav-mobile.active {
  display: block;
}

.nav-mobile .nav-link {
  display: block;
  padding: var(--spacing-3) 0;
  font-size: var(--text-base);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav-mobile .nav-link:last-child {
  border-bottom: none;
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
  position: relative;
  padding-top: 8rem;
  padding-bottom: 5rem;
  overflow: hidden;
}

@media (min-width: 1024px) {
  .hero {
    padding-top: 12rem;
    padding-bottom: 8rem;
  }
}

.hero-content {
  position: relative;
  z-index: 10;
  text-align: center;
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

@media (min-width: 640px) {
  .hero-content { padding: 0 var(--spacing-6); }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-1) var(--spacing-3);
  border-radius: var(--radius-full);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.2);
  color: var(--color-blue-400);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-8);
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: var(--font-bold);
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin-bottom: var(--spacing-6);
}

.hero-subtitle {
  max-width: 42rem;
  margin: 0 auto;
  font-size: var(--text-xl);
  color: var(--color-text-muted);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
  justify-content: center;
  margin-top: var(--spacing-10);
}

@media (min-width: 640px) {
  .hero-actions { flex-direction: row; }
}

/* Stats Row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-4);
  max-width: 56rem;
  margin: var(--spacing-16) auto 0;
}

@media (min-width: 768px) {
  .stats-row { grid-template-columns: repeat(4, 1fr); }
}

/* ========================================
   SECTIONS
   ======================================== */

.section {
  padding: var(--spacing-20) 0;
}

.section-alt {
  background: rgba(15, 23, 42, 0.5);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-16);
}

.section-header h2 {
  margin-bottom: var(--spacing-4);
}

.section-header p {
  max-width: 42rem;
  margin: 0 auto;
}

.section-header-flex {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-12);
}

@media (min-width: 768px) {
  .section-header-flex {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }
}

/* ========================================
   GRID SYSTEM
   ======================================== */

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-6);
}

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-6);
}

@media (min-width: 768px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-4);
}

@media (min-width: 768px) {
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* Masonry Layout */
.masonry {
  columns: 1;
  column-gap: var(--spacing-6);
}

@media (min-width: 768px) {
  .masonry { columns: 2; }
}

@media (min-width: 1024px) {
  .masonry { columns: 3; }
}

.masonry > * {
  break-inside: avoid;
  margin-bottom: var(--spacing-6);
}

/* ========================================
   SIDEBAR LAYOUT
   ======================================== */

.layout-sidebar {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-8);
}

@media (min-width: 1024px) {
  .layout-sidebar {
    grid-template-columns: 280px 1fr;
  }
}

.sidebar {
  position: sticky;
  top: 100px;
  height: fit-content;
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.sidebar-link {
  padding: var(--spacing-3) var(--spacing-4);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.sidebar-link:hover {
  color: var(--color-text-secondary);
  background: rgba(255, 255, 255, 0.05);
}

.sidebar-link.active {
  color: var(--color-text-primary);
  background: rgba(56, 189, 248, 0.1);
}

/* ========================================
   FOOTER
   ======================================== */

.footer {
  padding: var(--spacing-16) 0 var(--spacing-8);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  background: var(--color-bg-secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-8);
  margin-bottom: var(--spacing-12);
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr repeat(3, 1fr);
  }
}

.footer-brand {
  max-width: 280px;
}

.footer-brand .nav-logo {
  margin-bottom: var(--spacing-4);
}

.footer-brand p {
  font-size: var(--text-sm);
}

.footer-heading {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-4);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.footer-link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

.footer-link:hover {
  color: var(--color-accent);
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
  padding-top: var(--spacing-8);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.footer-copyright {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer-social {
  display: flex;
  gap: var(--spacing-4);
}

.footer-social a {
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

.footer-social a:hover {
  color: var(--color-accent);
}

.footer-social svg {
  width: 20px;
  height: 20px;
}

/* ========================================
   PAGE LAYOUTS
   ======================================== */

.page {
  padding-top: 80px;
  min-height: 100vh;
}

.page-header {
  padding: var(--spacing-16) 0 var(--spacing-12);
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.page-header h1 {
  margin-bottom: var(--spacing-4);
}

.page-header p {
  max-width: 36rem;
  margin: 0 auto;
}

.page-content {
  padding: var(--spacing-12) 0;
}

/* Two Column Layout */
.two-col {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-12);
  align-items: center;
}

@media (min-width: 1024px) {
  .two-col { grid-template-columns: 1fr 1fr; }
  .two-col.reverse { direction: rtl; }
  .two-col.reverse > * { direction: ltr; }
}

/* ========================================
   BREADCRUMBS
   ======================================== */

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-6);
}

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

.breadcrumb-separator {
  color: var(--color-slate-600);
}

/* ========================================
   TABS
   ======================================== */

.tabs {
  display: flex;
  gap: var(--spacing-1);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: var(--spacing-8);
  overflow-x: auto;
}

.tab {
  padding: var(--spacing-4) var(--spacing-6);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.tab:hover {
  color: var(--color-text-secondary);
}

.tab.active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* Tab Panels */
.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

/* ========================================
   PAGINATION
   ======================================== */

.pagination {
  display: flex;
  justify-content: center;
  gap: var(--spacing-2);
  margin-top: var(--spacing-12);
}

.pagination-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  background: var(--color-bg-tertiary);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
}

.pagination-btn:hover:not(:disabled) {
  color: var(--color-text-primary);
  border-color: var(--color-accent);
}

.pagination-btn.active {
  color: white;
  background: var(--color-blue-600);
  border-color: var(--color-blue-600);
}

.pagination-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ========================================
   LINK ARROW
   ======================================== */

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-1);
  font-weight: var(--font-medium);
  color: var(--color-accent);
}

.link-arrow svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-base);
}

.link-arrow:hover svg {
  transform: translateX(4px);
}

/* ========================================
   SCROLL TO TOP
   ======================================== */

.scroll-top {
  position: fixed;
  bottom: var(--spacing-6);
  right: var(--spacing-6);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-blue-600);
  border: none;
  border-radius: 50%;
  color: white;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  z-index: var(--z-sticky);
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  background: var(--color-blue-500);
  transform: translateY(-2px);
}

.scroll-top svg {
  width: 24px;
  height: 24px;
}