/**
 * COSAS3D — Layout & Global Sections
 * Header, Hero, Philosophy, Value Props, Conversion Banner, Footer
 */

/* 1. Global Navigation Bar */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(14, 16, 19, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-subtle);
  z-index: var(--z-nav);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.site-header.is-scrolled {
  background-color: rgba(14, 16, 19, 0.96);
  border-bottom-color: var(--color-border-medium);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  height: 38px;
  flex-shrink: 0;
}

.brand-logo-img {
  height: 34px;
  width: auto;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-link {
  font-size: 0.925rem;
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  position: relative;
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-text-primary);
}

.nav-link.active {
  color: #ffffff;
  font-weight: var(--fw-semibold);
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-accent-orange);
  box-shadow: 0 0 8px var(--color-accent-orange);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Mobile Toggle */
.mobile-nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  color: var(--color-text-primary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-subtle);
  background-color: var(--color-bg-surface);
}

/* Mobile Drawer Overlay */
.mobile-nav-drawer {
  position: fixed;
  top: var(--header-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--header-height));
  background-color: rgba(14, 16, 19, 0.98);
  backdrop-filter: blur(16px);
  padding: var(--space-2xl) var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition-normal), opacity var(--transition-normal), visibility var(--transition-normal);
  z-index: var(--z-nav);
}

.mobile-nav-drawer.is-open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav-drawer .nav-link {
  font-size: 1.25rem;
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

/* 2. Hero Section */
.hero-section {
  position: relative;
  padding: clamp(var(--space-3xl), 8vw, var(--space-5xl)) 0 var(--space-3xl) 0;
  overflow: hidden;
}

.hero-glow-layer {
  position: absolute;
  top: 10%;
  right: -5%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255, 90, 31, 0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 820px;
}

.hero-tagline {
  margin-bottom: var(--space-md);
}

.hero-title {
  font-size: clamp(2.5rem, 5.5vw, 4.25rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-lg);
}

.hero-title .title-accent {
  color: var(--color-accent-orange);
  display: block;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  line-height: 1.55;
  color: var(--color-text-secondary);
  max-width: 680px;
  margin-bottom: var(--space-2xl);
}

.hero-cta-group {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-bottom: var(--space-3xl);
}

/* Telemetry Stats Bar */
.hero-stats-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  padding: var(--space-lg) var(--space-xl);
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  position: relative;
}

.hero-stats-bar::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--space-xl);
  width: 48px;
  height: 2px;
  background-color: var(--color-accent-orange);
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.stat-value {
  font-family: var(--font-family-display);
  font-size: 1.75rem;
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.03em;
}

.stat-label {
  font-size: 0.875rem;
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
}

.stat-detail {
  font-family: var(--font-family-mono);
  font-size: 0.725rem;
  color: var(--color-text-muted);
}

/* 3. Section Standards */
.section {
  padding: clamp(var(--space-3xl), 6vw, var(--space-4xl)) 0;
  position: relative;
}

.section-header {
  margin-bottom: var(--space-2xl);
}

.section-header.text-center {
  text-align: center;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.section-header-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
  flex-wrap: wrap;
}

.section-title {
  margin-top: var(--space-xs);
  margin-bottom: var(--space-sm);
}

.section-desc {
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
}

/* 4. Philosophy Section */
.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.philosophy-card {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.philosophy-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-medium);
}

.philosophy-num {
  font-family: var(--font-family-mono);
  font-size: 1.75rem;
  font-weight: var(--fw-bold);
  color: var(--color-accent-orange);
  margin-bottom: var(--space-lg);
}

.philosophy-title {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
}

.philosophy-text {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 5. Value Props Grid */
.value-props-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.value-prop-card {
  background: linear-gradient(180deg, var(--color-bg-surface) 0%, var(--color-bg-canvas) 100%);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.value-prop-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent-orange-subtle);
  border: 1px solid rgba(255, 90, 31, 0.25);
  border-radius: var(--radius-sm);
  color: var(--color-accent-orange);
}

/* 6. Conversion Banner */
.conversion-banner {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border-medium);
  border-radius: var(--radius-lg);
  padding: clamp(var(--space-2xl), 5vw, var(--space-3xl));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2xl);
  position: relative;
  overflow: hidden;
}

.conversion-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background-color: var(--color-accent-orange);
}

.conversion-content {
  max-width: 600px;
}

/* 7. Footer */
.site-footer {
  margin-top: auto;
  background-color: var(--color-bg-deep);
  border-top: 1px solid var(--color-border-subtle);
  padding: var(--space-4xl) 0 var(--space-2xl) 0;
  font-size: 0.925rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-3xl);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.footer-brand-logo {
  height: 32px;
  width: auto;
}

.footer-bio {
  color: var(--color-text-secondary);
  line-height: 1.55;
  max-width: 340px;
}

.footer-status-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-family-mono);
  font-size: 0.725rem;
  color: var(--color-status-success);
  padding: var(--space-2xs) var(--space-sm);
  background-color: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: var(--radius-pill);
  width: fit-content;
}

.footer-status-dot {
  width: 6px;
  height: 6px;
  background-color: var(--color-status-success);
  border-radius: 50%;
  animation: pulse-green 2s infinite ease-in-out;
}

@keyframes pulse-green {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.footer-col-title {
  font-family: var(--font-family-display);
  font-size: 0.95rem;
  font-weight: var(--fw-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-lg);
  letter-spacing: -0.01em;
}

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

.footer-link {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-text-primary);
  transform: translateX(2px);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-border-subtle);
  color: var(--color-text-muted);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: var(--space-md);
}