/**
 * 04 - Components — Premium UI Elements
 * @package Stratos_One_Portfolio
 * 
 * Source: robert-portfolio/assets/css/bundle.css (components sections)
 * Purpose: Header, Footer, Buttons, Cards, Modal
 */

/* ============================================
   Header Component
   ============================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background-color: transparent;
  transition: background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background-color: rgba(7, 9, 12, 0.88);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom-color: var(--color-border-subtle);
  box-shadow: 0 1px 0 var(--color-border-subtle), 0 8px 32px rgba(0,0,0,0.4);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  height: 68px;
  gap: var(--spacing-xl);
}

/* Branding */
.site-branding a {
  color: var(--color-text-primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: opacity var(--transition-fast);
}

.site-branding a:hover {
  opacity: 0.82;
}

.brand-logo {
  width: 240px;
  height: 48px;
  display: block;
}

/* Navigation */
.main-navigation ul {
  display: flex;
  gap: 2px;
  list-style: none;
}

.main-navigation a {
  display: block;
  padding: 6px 14px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius);
  transition: all var(--transition-fast);
  letter-spacing: -0.01em;
}

.main-navigation a:hover {
  color: var(--color-text-primary);
  background-color: var(--color-surface-subtle);
}

.main-navigation .current-menu-item a {
  color: var(--color-accent-primary);
}

/* Header CTAs */
.header-cta-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  flex-shrink: 0;
}

.header-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 7px 16px;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius);
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
  letter-spacing: -0.01em;
}

.header-cta-secondary {
  background-color: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border-strong);
}

.header-cta-secondary:hover {
  color: var(--color-text-primary);
  border-color: var(--color-border-accent);
  background-color: var(--color-surface-subtle);
}

.header-cta-primary {
  background-color: var(--color-accent-primary);
  color: #fff;
  border: 1px solid transparent;
  box-shadow: 0 2px 8px rgba(59,130,246,0.3);
}

.header-cta-primary:hover {
  background-color: var(--color-accent-hover);
  color: #fff;
  box-shadow: 0 4px 16px rgba(59,130,246,0.4);
  transform: translateY(-1px);
}

/* Mobile toggle */
.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border-strong);
  color: var(--color-text-primary);
  cursor: pointer;
  padding: 7px 10px;
  border-radius: var(--radius);
  transition: all var(--transition-fast);
  font-size: 1.4rem;
  line-height: 1;
}

.menu-toggle:hover {
  border-color: var(--color-border-accent);
  color: var(--color-accent-primary);
}

/* ============================================
   Footer Component
   ============================================ */

.site-footer {
  background-color: var(--color-bg-primary);
  border-top: 1px solid var(--color-border-subtle);
  padding: var(--spacing-xl) 0;
}

.footer-content {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-xl);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-logo {
  width: 140px;
  height: 30px;
  opacity: 0.6;
  transition: opacity var(--transition-fast);
}

.footer-logo:hover { opacity: 1; }

.footer-copyright {
  font-size: var(--font-size-xs);
  color: var(--color-text-faint);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.footer-link {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
  letter-spacing: -0.01em;
}

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

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: var(--radius);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  font-family: var(--font-family-base);
  transition: all var(--transition-base);
  cursor: pointer;
  border: none;
  text-decoration: none;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-accent-primary);
  color: #fff;
  box-shadow: 0 2px 12px rgba(59, 130, 246, 0.32), 0 0 0 0 rgba(59, 130, 246, 0);
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(59, 130, 246, 0.42);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border-strong);
}

.btn-secondary:hover {
  color: var(--color-text-primary);
  border-color: var(--color-border-accent);
  background-color: var(--color-surface-subtle);
  transform: translateY(-1px);
}

/* ============================================
   Modal Component
   ============================================ */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(7, 9, 12, 0.9);
  z-index: var(--z-modal-backdrop);
}

/* Scrollbar inside modal */
.modal-content::-webkit-scrollbar,
.case-study-content::-webkit-scrollbar,
.work-env-modal-content::-webkit-scrollbar {
  width: 4px;
}

.modal-content::-webkit-scrollbar-thumb,
.case-study-content::-webkit-scrollbar-thumb,
.work-env-modal-content::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: 2px;
}

body.modal-open { overflow: hidden; }

/* Diagram modal */
.diagram-modal {
  position: fixed;
  inset: 0;
  background-color: rgba(7, 9, 12, 0.94);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  padding: var(--spacing-xl);
}

.diagram-modal.active {
  opacity: 1;
  visibility: visible;
}

.diagram-modal-content {
  position: relative;
  max-width: 860px;
  width: 100%;
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-xl);
  transform: scale(0.92);
  transition: transform var(--transition-base);
}

.diagram-modal.active .diagram-modal-content {
  transform: scale(1);
}

.diagram-modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 36px;
  height: 36px;
  background-color: var(--color-bg-tertiary);
  border: 1px solid var(--color-border-subtle);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  transition: all var(--transition-fast);
}

.diagram-modal-close:hover {
  background-color: var(--color-error);
  border-color: var(--color-error);
}

.diagram-modal-close:hover svg { fill: #fff; }

.diagram-modal-close svg {
  width: 22px;
  height: 22px;
  fill: var(--color-text-primary);
  transition: fill var(--transition-fast);
}

.diagram-modal-title {
  font-size: var(--font-size-lg);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
  text-align: center;
  font-weight: var(--font-weight-semibold);
}

.diagram-modal .hero-diagram {
  width: 100%;
  height: auto;
  max-height: 72vh;
  object-fit: contain;
}