/* ==========================================================================
   Components — Reusable UI elements
   ========================================================================== */

/* ---------- Site Header / Navigation ---------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  padding: var(--space-5) 0;
  transition:
    background-color var(--duration-normal) var(--ease-out),
    padding var(--duration-normal) var(--ease-out),
    backdrop-filter var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out);
}

.site-header.is-scrolled {
  padding: var(--space-3) 0;
  background-color: var(--color-surface);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--color-border);
}

[data-theme="dark"] .site-header.is-scrolled {
  background-color: rgba(13, 13, 16, 0.9);
}

/* Dark mode: ensure header elements are visible over dark hero overlay */
[data-theme="dark"] .site-header:not(.is-scrolled) .site-brand__name {
  color: #E8E6E1;
  text-shadow: 0 1px 8px rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] .site-header:not(.is-scrolled) .nav-links a {
  color: rgba(232, 230, 225, 0.8);
}

[data-theme="dark"] .site-header:not(.is-scrolled) .nav-links a:hover,
[data-theme="dark"] .site-header:not(.is-scrolled) .nav-links a.is-active {
  color: #E8E6E1;
}

[data-theme="dark"] .site-header:not(.is-scrolled) .toggle-btn {
  color: rgba(232, 230, 225, 0.85);
}

[data-theme="dark"] .site-header:not(.is-scrolled) .toggle-btn:hover {
  color: #E8E6E1;
  background-color: rgba(255, 255, 255, 0.1);
}

[data-theme="dark"] .site-header:not(.is-scrolled) .lang-toggle {
  color: rgba(232, 230, 225, 0.85);
  border-color: rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] .site-header:not(.is-scrolled) .lang-toggle:hover {
  color: #E8E6E1;
  border-color: rgba(255, 255, 255, 0.4);
  background-color: rgba(255, 255, 255, 0.1);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

/* ---------- Logo / Brand Mark ---------- */

.site-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-brand__name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  letter-spacing: var(--tracking-wide);
  color: var(--color-text);
  line-height: 1.2;
  transition: color var(--duration-normal) var(--ease-in-out);
  white-space: nowrap;
}

[dir="rtl"] .site-brand__name {
  font-family: var(--font-persian);
  font-size: var(--text-xl);
  letter-spacing: 0;
}

/* ---------- Primary Navigation ---------- */

.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-links a {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 400;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
  position: relative;
}

[dir="rtl"] .nav-links a {
  font-family: var(--font-persian);
  text-transform: none;
  letter-spacing: 0;
  font-size: var(--text-base);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent-warm);
  transition: width var(--duration-normal) var(--ease-out);
}

[dir="rtl"] .nav-links a::after {
  left: auto;
  right: 0;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--color-text);
}

.nav-links a:hover::after,
.nav-links a.is-active::after {
  width: 100%;
}

/* ---------- Controls (Theme + Language Toggles) ---------- */

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  color: var(--color-text-secondary);
  transition:
    color var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out);
}

.toggle-btn:hover {
  color: var(--color-text);
  background-color: var(--color-border);
}

.toggle-btn svg {
  width: 24px;
  height: 24px;
  transition: transform var(--duration-normal) var(--ease-out);
}

.lang-toggle {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-secondary);
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-border-strong);
  border-radius: 24px;
  width: auto;
  height: auto;
  transition:
    color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out);
}

.lang-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
  background-color: var(--color-border);
}

/* ---------- Mobile Menu Toggle ---------- */

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px 0;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--color-text);
  transition:
    transform var(--duration-normal) var(--ease-out),
    opacity var(--duration-fast) var(--ease-out);
}

.menu-toggle.is-active span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.menu-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-active span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ---------- Mobile Navigation Overlay ---------- */

.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-nav) - 1);
  background-color: var(--color-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--duration-normal) var(--ease-out),
    visibility var(--duration-normal) var(--ease-out);
}

.mobile-nav-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
}

.mobile-nav-links a {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
}

[dir="rtl"] .mobile-nav-links a {
  font-family: var(--font-persian);
  letter-spacing: 0;
}

.mobile-nav-links a:hover {
  color: var(--color-text);
}

/* ---------- Decorative Separator ---------- */

.separator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin: var(--space-8) auto;
}

.separator__line {
  width: 60px;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-accent-warm),
    transparent
  );
}

[dir="rtl"] .separator__line {
  background: linear-gradient(
    270deg,
    transparent,
    var(--color-accent-warm),
    transparent
  );
}

.separator__diamond {
  width: 6px;
  height: 6px;
  background-color: var(--color-accent-warm);
  transform: rotate(45deg);
  flex-shrink: 0;
}

/* ---------- Lightbox ---------- */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  background-color: var(--color-overlay-heavy);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  opacity: 0;
  visibility: hidden;
  cursor: zoom-out;
  transition:
    opacity var(--duration-normal) var(--ease-out),
    visibility var(--duration-normal) var(--ease-out);
}

.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.lightbox__image {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  transform: scale(0.95);
  transition: transform var(--duration-normal) var(--ease-out);
}

.lightbox.is-open .lightbox__image {
  transform: scale(1);
}

.lightbox__close {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity var(--duration-fast) var(--ease-out);
}

[dir="rtl"] .lightbox__close {
  right: auto;
  left: var(--space-6);
}

.lightbox__close:hover {
  opacity: 1;
}

.lightbox__close svg {
  width: 28px;
  height: 28px;
}

/* ---------- Scroll Indicator ---------- */

.scroll-indicator {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  opacity: 0.6;
}

.scroll-indicator__icon {
  width: 24px;
  height: 36px;
  border: 1.5px solid var(--color-text-muted);
  border-radius: 12px;
  position: relative;
}

.scroll-indicator__dot {
  width: 3px;
  height: 8px;
  background-color: var(--color-text-muted);
  border-radius: 2px;
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scrollDot 2s var(--ease-in-out) infinite;
}

@keyframes scrollDot {
  0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
  50% { opacity: 0.3; transform: translateX(-50%) translateY(12px); }
}