/**
 * KROT AI Layout
 * Header, navigation, footer
 * Uses Bootstrap Navbar + custom enhancements
 */

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

#header {
  background: transparent;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1050;
  padding: 1.5rem 0;
}

#header.header-scrolled {
  background: var(--krot-glass-bg-stronger);
  box-shadow: var(--bs-box-shadow);
  border-bottom: 1px solid var(--bs-border-color);
  padding: 1rem 0;
  backdrop-filter: blur(10px);
}

/* Logo */
.navbar-brand {
  font-family: var(--krot-font-heading);
  font-weight: 800;
  font-size: 1.5rem;
  background: var(--krot-gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
  transition: all 0.3s ease;
}

.navbar-brand:hover {
  text-shadow: 0 0 20px rgba(6, 182, 212, 0.3);
  transform: scale(1.02);
}

/* ==========================================================================
   Navigation Links
   ========================================================================== */

.navbar-nav .nav-link {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--bs-secondary-color);
  padding: 0.5rem 1rem;
  transition: all 0.3s ease;
  border-radius: 0.5rem;
  margin: 0 0.125rem;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--bs-emphasis-color);
  background: var(--bs-tertiary-bg);
}

.navbar-nav .nav-link.active {
  font-weight: 600;
  color: var(--krot-accent);
  background: var(--krot-accent-bg-subtle);
}

/* CTA Button in Nav */
.navbar .btn-primary {
  font-weight: 600;
  padding: 0.625rem 1.5rem;
  background: var(--krot-gradient-accent);
  border: none;
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.2);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.navbar .btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(6, 182, 212, 0.3);
}

/* Theme Switcher - Modern Toggle */
.theme-switch-wrapper {
  display: flex;
  align-items: center;
  height: 100%;
}

.theme-switch {
  display: inline-block;
  height: 34px;
  position: relative;
  width: 64px;
  margin-bottom: 0;
}

.theme-switch input {
  /* Визуально скрыт, но доступен для label for="..." */
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.slider {
  background-color: var(--bs-tertiary-bg);
  border: 1px solid var(--bs-border-color);
  bottom: 0;
  cursor: pointer;
  left: 0;
  position: absolute;
  right: 0;
  top: 0;
  transition: .4s;
  border-radius: 34px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 8px;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.slider:before {
  background-color: var(--bs-body-bg);
  bottom: 3px;
  content: "";
  height: 26px;
  left: 4px;
  position: absolute;
  transition: .4s cubic-bezier(0.4, 0.0, 0.2, 1);
  width: 26px;
  border-radius: 50%;
  z-index: 2;
  box-shadow: var(--bs-box-shadow-sm);
}

/* Icons on track */
.slider .bi {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  transition: all 0.4s cubic-bezier(0.4, 0.0, 0.2, 1);
  font-size: 16px;
  line-height: 1;
}

.sun-icon {
  left: 9px;
  opacity: 1;
  color: #fbbf24; /* Amber */
  text-shadow: 0 0 8px rgba(251, 191, 36, 0.6);
}

.moon-icon {
  left: 9px;
  opacity: 0;
  color: var(--bs-body-bg); /* Contrast against gradient */
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.6);
}

/* Checked state (Dark Mode) */
input:checked + .slider {
  background-color: rgba(15, 23, 42, 0.8);
  border-color: rgba(148, 163, 184, 0.3);
  box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.4);
}

input:checked + .slider:before {
  transform: translateX(30px);
  background: var(--krot-gradient-accent);
  box-shadow: 0 0 15px rgba(6, 182, 212, 0.5);
}

/* Icon animations based on state */
input:checked + .slider .sun-icon {
  left: 39px;
  opacity: 0;
  transform: translateY(-50%) rotate(90deg) scale(0.5);
}

input:checked + .slider .moon-icon {
  left: 39px;
  opacity: 1;
  transform: translateY(-50%) rotate(0deg) scale(1);
}

input:not(:checked) + .slider .sun-icon {
  transform: translateY(-50%) rotate(0deg) scale(1);
}

input:not(:checked) + .slider .moon-icon {
  transform: translateY(-50%) rotate(-90deg) scale(0.5);
}

/* Hover effects */
.theme-switch:hover .slider {
  border-color: var(--krot-accent-light);
  background-color: var(--bs-tertiary-bg);
}

.theme-switch:hover .slider:before {
  box-shadow: 0 0 12px var(--krot-accent-glow);
}

/* ==========================================================================
   Mobile Navigation (Offcanvas)
   ========================================================================== */

/* Offcanvas z-index выше header (1050) чтобы меню было поверх */
#navbarOffcanvas {
  --bs-offcanvas-bg: var(--krot-glass-bg-stronger);
  z-index: 1055 !important;
  border-left: 1px solid var(--bs-border-color);
  backdrop-filter: blur(10px);
}

/* Backdrop тоже выше header чтобы затемнить всё включая header */
.offcanvas-backdrop {
  z-index: 1051 !important;
}

/* Понизить z-index header когда offcanvas открыт */
#header.offcanvas-open {
  z-index: 1040 !important;
}

/* CSS :has() fallback для современных браузеров */
@supports selector(:has(*)) {
  html:has(.offcanvas.show) #header,
  html:has(.offcanvas.showing) #header {
    z-index: 1040 !important;
  }
}

/* Prevent closed offcanvas from causing horizontal scroll */
.offcanvas#navbarOffcanvas:not(.show):not(.showing):not(.hiding) {
  display: none !important;
  visibility: hidden !important;
}

/* Fix: prevent horizontal scroll on mobile from offcanvas */
#navbarOffcanvas:not(.show):not(.showing) {
  visibility: hidden;
  transform: translateX(100%);
}

/* Offcanvas body padding */
#navbarOffcanvas .offcanvas-body {
  padding: 1.5rem;
}

/* Nav items с отступами между собой */
#navbarOffcanvas .navbar-nav {
  gap: 0.25rem;
}

#navbarOffcanvas .navbar-nav .nav-item {
  width: 100%;
}

/* Крупные кликабельные зоны */
#navbarOffcanvas .navbar-nav .nav-link {
  display: block;
  width: 100%;
  padding: 1rem 1.25rem;
  font-size: 1.125rem;
  font-weight: 500;
  color: var(--bs-body-color);
  border-radius: var(--bs-border-radius);
  transition: background-color var(--krot-transition-base), color var(--krot-transition-base);
}

#navbarOffcanvas .navbar-nav .nav-link:hover,
#navbarOffcanvas .navbar-nav .nav-link:active {
  background: rgba(var(--krot-accent-rgb), 0.1);
  color: var(--bs-primary);
}

#navbarOffcanvas .navbar-nav .nav-link.active {
  background: rgba(var(--krot-accent-rgb), 0.15);
  color: var(--bs-primary);
}

/* CTA кнопка в offcanvas */
#navbarOffcanvas .btn-primary {
  padding: 1rem 1.5rem;
  font-size: 1.125rem;
}

/* Theme switch в offcanvas */
#navbarOffcanvas .theme-switch-wrapper {
  margin-left: 0;
}

/* Desktop navigation: скрыть на мобильных */
@media (max-width: 991.98px) {
  #navbarNav {
    display: none !important;
  }
}

/* Mobile toggler: скрыть на десктопе */
@media (min-width: 992px) {
  .navbar-toggler {
    display: none !important;
  }
}

/* ==========================================================================
   Language Toggle (Modern Segmented Control)
   ========================================================================== */

.lang-toggle {
  --toggle-padding: 4px;
  --toggle-option-width: 36px;
  --toggle-option-height: 28px;
  --toggle-gap: 2px;
  --toggle-radius: 20px;

  position: relative;
  display: inline-grid;
  grid-template-columns: var(--toggle-option-width) var(--toggle-option-width);
  gap: var(--toggle-gap);
  padding: var(--toggle-padding);
  background: var(--bs-tertiary-bg);
  border: 1px solid var(--bs-border-color);
  border-radius: var(--toggle-radius);
}

.lang-toggle-option {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--toggle-option-width);
  height: var(--toggle-option-height);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--bs-secondary-color);
  border-radius: calc(var(--toggle-radius) - var(--toggle-padding));
  transition: color 0.2s ease;
  cursor: pointer;
  user-select: none;
}

.lang-toggle-option:hover:not(.active) {
  color: var(--bs-body-color);
}

.lang-toggle-option.active {
  color: var(--bs-emphasis-color);
  cursor: default;
}

/* Sliding indicator */
.lang-toggle-indicator {
  position: absolute;
  z-index: 1;
  top: var(--toggle-padding);
  left: var(--toggle-padding);
  width: var(--toggle-option-width);
  height: var(--toggle-option-height);
  background: var(--bs-body-bg);
  border-radius: calc(var(--toggle-radius) - var(--toggle-padding));
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.06),
    0 1px 3px rgba(0, 0, 0, 0.1);
  transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

/* Move indicator to right when first option (RU) is NOT active */
.lang-toggle-option:first-child:not(.active) ~ .lang-toggle-indicator {
  transform: translateX(calc(var(--toggle-option-width) + var(--toggle-gap)));
}

/* Subtle hover effect on container */
.lang-toggle:hover {
  border-color: color-mix(in srgb, var(--krot-accent) 30%, var(--bs-border-color));
}

/* Focus styles */
.lang-toggle-option:focus-visible {
  outline: 2px solid var(--krot-accent);
  outline-offset: 1px;
}

/* Light theme refinements */
[data-bs-theme="light"] .lang-toggle {
  background: color-mix(in srgb, var(--bs-body-bg) 50%, var(--bs-tertiary-bg));
}

[data-bs-theme="light"] .lang-toggle-indicator {
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.04),
    0 1px 3px rgba(0, 0, 0, 0.06),
    0 0 0 1px rgba(0, 0, 0, 0.03);
}

/* ==========================================================================
   Mobile Header Controls (Language + Theme + Burger)
   ========================================================================== */

.mobile-header-controls {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.mobile-lang-btn,
.mobile-theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  color: var(--bs-body-color);
  background: transparent;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.2s ease;
}

.mobile-lang-btn:hover,
.mobile-lang-btn:focus,
.mobile-theme-btn:hover {
  color: var(--krot-accent);
  background: var(--krot-accent-bg-subtle);
}

.mobile-lang-btn .bi,
.mobile-theme-btn .bi {
  font-size: 1.25rem;
}

/* Mobile theme button icon switching */
.mobile-theme-btn .icon-dark {
  display: none;
}

[data-bs-theme="light"] .mobile-theme-btn .icon-light {
  display: none;
}

[data-bs-theme="light"] .mobile-theme-btn .icon-dark {
  display: block;
}

/* ==========================================================================
   Language Suggestion Banner (Floating Card Style)
   ========================================================================== */

.lang-banner {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 1100;
  max-width: 380px;
  transform: translateY(20px) scale(0.95);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1),
              opacity 0.3s ease;
}

.lang-banner.show {
  transform: translateY(0) scale(1);
  opacity: 1;
  pointer-events: auto;
}

.lang-banner.hiding {
  transform: translateY(20px) scale(0.95);
  opacity: 0;
  pointer-events: none;
}

.lang-banner-content {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.25rem;
  background: var(--bs-body-bg);
  border: 1px solid var(--bs-border-color);
  border-radius: 1rem;
  box-shadow:
    0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 10px 25px -5px rgba(0, 0, 0, 0.15),
    0 0 0 1px rgba(255, 255, 255, 0.05) inset;
}

/* Gradient accent line at top */
.lang-banner-content::before {
  content: '';
  position: absolute;
  top: 0;
  left: 1rem;
  right: 1rem;
  height: 3px;
  background: linear-gradient(90deg, var(--krot-accent), var(--krot-accent-light, #60a5fa));
  border-radius: 0 0 3px 3px;
}

.lang-banner-header {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
}

.lang-banner-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--krot-accent-bg-subtle), transparent);
  border: 1px solid var(--krot-accent-bg-subtle);
  color: var(--krot-accent);
  font-size: 1.375rem;
  flex-shrink: 0;
}

.lang-banner-text {
  flex: 1;
  min-width: 0;
  padding-right: 1.5rem;
}

.lang-banner-title {
  display: block;
  font-weight: 600;
  color: var(--bs-emphasis-color);
  font-size: 0.9375rem;
  line-height: 1.4;
  margin-bottom: 0.25rem;
}

.lang-banner-subtitle {
  display: block;
  font-size: 0.8125rem;
  color: var(--bs-secondary-color);
  line-height: 1.5;
}

.lang-banner-actions {
  display: flex;
  gap: 0.625rem;
}

.lang-banner-accept {
  flex: 1;
  font-weight: 600;
  padding: 0.625rem 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
}

.lang-banner-dismiss {
  padding: 0.625rem 1rem;
  color: var(--bs-secondary-color);
  border-color: var(--bs-border-color);
}

.lang-banner-dismiss:hover {
  background: var(--bs-tertiary-bg);
  border-color: var(--bs-border-color);
  color: var(--bs-body-color);
}

.lang-banner-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: none;
  background: transparent;
  color: var(--bs-tertiary-color);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
  font-size: 0.875rem;
}

.lang-banner-close:hover {
  background: var(--bs-tertiary-bg);
  color: var(--bs-body-color);
}

/* Mobile: Bottom sheet style */
@media (max-width: 575.98px) {
  .lang-banner {
    bottom: 0;
    right: 0;
    left: 0;
    max-width: none;
    transform: translateY(100%);
  }

  .lang-banner.show {
    transform: translateY(0);
  }

  .lang-banner.hiding {
    transform: translateY(100%);
  }

  .lang-banner-content {
    border-radius: 1rem 1rem 0 0;
    border-bottom: none;
    padding: 1.25rem 1rem 1.5rem;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.2);
  }

  .lang-banner-content::before {
    left: 50%;
    right: auto;
    transform: translateX(-50%);
    width: 40px;
    height: 4px;
    background: var(--bs-border-color);
    border-radius: 4px;
    top: 0.5rem;
  }

  .lang-banner-header {
    margin-top: 0.5rem;
  }

  .lang-banner-icon {
    width: 40px;
    height: 40px;
    font-size: 1.25rem;
    border-radius: 10px;
  }

  .lang-banner-title {
    font-size: 0.9375rem;
  }

  .lang-banner-subtitle {
    font-size: 0.8125rem;
  }

  .lang-banner-actions {
    flex-direction: column;
    gap: 0.5rem;
  }

  .lang-banner-actions .btn {
    width: 100%;
    padding: 0.75rem 1rem;
  }

  .lang-banner-close {
    top: 0.625rem;
    right: 0.625rem;
  }
}

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

#footer {
  background: var(--bs-dark);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  position: relative;
  color: #f8fafc; /* Always dark theme for footer */
}

#footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--krot-accent), transparent);
  opacity: 0.5;
}

/* Footer Logo */
#footer .footer-logo {
  font-family: var(--krot-font-heading);
  font-size: 1.75rem;
  font-weight: 800;
  background: var(--krot-gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
  display: inline-block;
}

/* Footer Links */
#footer .footer-links a {
  color: rgba(255, 255, 255, 0.6);
  transition: all 0.3s ease;
  position: relative;
  padding-left: 0;
}

#footer .footer-links a:hover {
  color: var(--krot-accent);
  text-decoration: none;
  padding-left: 5px;
  text-shadow: 0 0 10px rgba(6, 182, 212, 0.4);
}

#footer .footer-links li {
  margin-bottom: 0.625rem;
}

/* Social Links */
#footer .social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: var(--bs-primary);
  color: #fff;
  border-radius: 50%;
  transition: all var(--krot-transition-base);
}

#footer .social-links a:hover {
  background: var(--krot-accent-light);
  transform: translateY(-3px);
}

/* Footer Bottom */
#footer .footer-bottom {
  border-top: 1px solid var(--bs-border-color);
  padding: 1.5rem 0;
  font-size: 1rem;
}

/* ==========================================================================
   Light Theme Footer Override
   ========================================================================== */

[data-bs-theme="light"] #footer {
  background: var(--bs-tertiary-bg);
  border-top-color: var(--bs-border-color);
  color: var(--bs-body-color);
}

[data-bs-theme="light"] #footer::before {
  opacity: 0.3;
}

[data-bs-theme="light"] #footer .footer-links a {
  color: var(--bs-secondary-color);
}

[data-bs-theme="light"] #footer .footer-links a:hover {
  color: var(--krot-accent);
  text-shadow: none;
}

[data-bs-theme="light"] #footer h5,
[data-bs-theme="light"] #footer h6 {
  color: var(--bs-emphasis-color);
}

/* ==========================================================================
   Language Transition Overlay
   Smooth fade when switching languages
   ========================================================================== */

.lang-transition-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bs-body-bg);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease-out, visibility 0.25s;
  pointer-events: none;
}

.lang-transition-overlay.active {
  opacity: 1;
  visibility: visible;
  pointer-events: all;
}

.lang-transition-overlay.fade-in {
  opacity: 0;
}

/* Optional: Add a subtle loading indicator */
.lang-transition-overlay::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 40px;
  height: 40px;
  margin: -20px 0 0 -20px;
  border: 3px solid var(--bs-border-color);
  border-top-color: var(--krot-accent);
  border-radius: 50%;
  opacity: 0;
  transition: opacity 0.15s ease 0.1s;
  animation: langTransitionSpin 0.8s linear infinite;
}

.lang-transition-overlay.active::after {
  opacity: 1;
}

@keyframes langTransitionSpin {
  to { transform: rotate(360deg); }
}