/* ============================================
   DentAlign - UI Components
   ============================================ */

/* ========== PRELOADER ========== */
.preloader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #0a1628;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.preloader.is-hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.preloader-video {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
}

/* ========== SCROLL PROGRESS ========== */

/* ========== LANGUAGE SELECTOR ========== */
.lang-selector {
  position: relative;
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.5rem 0.75rem;
  background: rgba(0, 179, 198, 0.1);
  border: 1px solid rgba(0, 179, 198, 0.2);
  border-radius: 0.5rem;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.lang-toggle:hover {
  background: rgba(0, 179, 198, 0.2);
  border-color: rgba(0, 179, 198, 0.4);
}

.lang-current {
  font-weight: 600;
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 180px;
  max-height: 400px;
  overflow-y: auto;
  background: rgba(10, 22, 40, 0.98);
  border: 1px solid rgba(0, 179, 198, 0.2);
  border-radius: 0.75rem;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s ease;
  z-index: 1000;
}

.lang-selector.is-open .lang-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1rem;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all 0.2s ease;
}

.lang-option:hover {
  background: rgba(0, 179, 198, 0.15);
  color: #fff;
}

.lang-option.is-active {
  background: rgba(0, 179, 198, 0.2);
  color: var(--primary);
}

.lang-flag {
  font-size: 0.75rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.5);
  min-width: 24px;
}

/* Light theme adjustments */
[data-theme="light"] .lang-dropdown {
  background: rgba(255, 255, 255, 0.98);
  border-color: rgba(0, 79, 124, 0.15);
}

[data-theme="light"] .lang-option {
  color: rgba(0, 40, 60, 0.8);
}

[data-theme="light"] .lang-option:hover {
  background: rgba(0, 179, 198, 0.1);
  color: var(--dark-blue);
}

[data-theme="light"] .lang-flag {
  color: rgba(0, 40, 60, 0.5);
}

/* ========== SCROLL PROGRESS ========== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 4px;
  background: linear-gradient(90deg, #00b3c6, #00d4aa, #00b3c6);
  background-size: 200% 100%;
  animation: progress-gradient 2s linear infinite;
  z-index: 10000;
  box-shadow: 0 0 10px rgba(0, 179, 198, 0.5);
}

@keyframes progress-gradient {
  0% { background-position: 0% 50%; }
  100% { background-position: 200% 50%; }
}

/* ========== HEADER ENHANCEMENTS ========== */
.header {
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.header.is-scrolled {
  background: rgba(10, 22, 40, 0.9);
  backdrop-filter: blur(20px);
  box-shadow: 
    0 4px 30px rgba(0, 0, 0, 0.3),
    0 0 20px rgba(0, 179, 198, 0.1);
  padding: var(--space-2) 0;
}

[data-theme="light"] .header.is-scrolled {
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 
    0 4px 30px rgba(0, 0, 0, 0.1),
    0 0 20px rgba(0, 179, 198, 0.05);
}

.header.is-scrolled .logo img {
  width: 36px;
  height: 36px;
}

.header.is-scrolled .logo-text {
  font-size: var(--text-lg);
}

/* ========== MOBILE MENU ========== */
.mobile-menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
  position: relative;
  align-items: center;
  justify-content: center;
}

.hamburger {
  position: relative;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--duration-fast) var(--ease-out);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--duration-fast) var(--ease-out);
}

.hamburger::before { top: -8px; }
.hamburger::after { bottom: -8px; }

.mobile-menu-toggle.is-active .hamburger {
  background: transparent;
}

.mobile-menu-toggle.is-active .hamburger::before {
  top: 0;
  transform: rotate(45deg);
}

.mobile-menu-toggle.is-active .hamburger::after {
  bottom: 0;
  transform: rotate(-45deg);
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }
  
  .nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: var(--bg-primary);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding: 100px var(--space-8) var(--space-8);
    gap: var(--space-2);
    box-shadow: var(--shadow-xl);
    transition: right var(--duration-normal) var(--ease-out);
    z-index: 10001;
  }
  
  .nav.is-open {
    right: 0;
  }
  
  .nav-link {
    width: 100%;
    padding: var(--space-4);
    font-size: var(--text-lg);
    border-radius: var(--radius-lg);
  }
  
  .nav-link:hover {
    background: var(--bg-secondary);
  }
}

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  line-height: 1;
  text-align: center;
  white-space: nowrap;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.btn:hover::before {
  opacity: 1;
}

/* Primary Button */
.btn-primary {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-md), 
              0 0 0 0 rgba(0, 179, 198, 0);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 
              var(--shadow-glow);
}

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

/* Secondary Button */
.btn-secondary {
  background: var(--color-secondary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
  background: var(--color-secondary-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Outline Button */
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* Ghost Button */
.btn-ghost {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
}

.btn-ghost:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  border-radius: var(--radius-md);
}

.btn-lg {
  padding: var(--space-5) var(--space-10);
  font-size: var(--text-lg);
  border-radius: var(--radius-xl);
}

/* Button with icon */
.btn-icon {
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: var(--radius-full);
}

.btn-icon svg {
  width: 24px;
  height: 24px;
}

/* ========== CARDS ========== */
.card {
  background: var(--bg-card);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--border-light);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  transition: all var(--duration-normal) var(--ease-out);
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}

/* ========== BADGE ========== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  border-radius: var(--radius-full);
  background: var(--color-accent-soft);
  color: var(--color-primary);
}

.badge-success {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.badge-error {
  background: var(--color-error-bg);
  color: var(--color-error);
}

/* ========== LOGO ========== */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
}

.logo img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.logo-text {
  background: var(--gradient-text);
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ========== NAV ========== */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--text-secondary);
  transition: color var(--duration-fast) var(--ease-out);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--duration-normal) var(--ease-out);
}

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

.nav-link:hover::after {
  width: 100%;
}

/* ========== THEME TOGGLE ========== */
.theme-toggle {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
}

.theme-toggle:hover {
  background: var(--bg-card-hover);
  border-color: var(--color-primary);
  transform: scale(1.05);
}

.theme-toggle svg {
  width: 22px;
  height: 22px;
  color: var(--text-primary);
  transition: transform var(--duration-normal) var(--ease-spring);
}

.theme-toggle:hover svg {
  transform: rotate(15deg);
}

/* Sun icon (shown in dark mode) */
.icon-sun { display: none; }

/* Moon icon (shown in light mode) */
.icon-moon { display: block; }

[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

/* ========== 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(--text-tertiary);
  font-size: var(--text-sm);
  animation: bounce 2s infinite;
}

.scroll-indicator-mouse {
  width: 26px;
  height: 40px;
  border: 2px solid var(--text-tertiary);
  border-radius: 13px;
  position: relative;
}

.scroll-indicator-wheel {
  width: 4px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 2px;
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll-wheel 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

@keyframes scroll-wheel {
  0% { opacity: 1; top: 8px; }
  100% { opacity: 0; top: 20px; }
}

/* ========== DIVIDER ========== */
.divider {
  width: 100%;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--border-medium) 50%,
    transparent 100%
  );
}

/* ========== TOOLTIP ========== */
[data-tooltip] {
  position: relative;
}

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  padding: var(--space-2) var(--space-3);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: var(--text-xs);
  white-space: nowrap;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-fast) var(--ease-out);
  z-index: var(--z-tooltip);
}

[data-tooltip]:hover::after {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(-12px);
}