/* E.V.G. Lab — Unified Site Layout: Sticky Header & Footer */
:root {
  --site-header-bg: rgba(7, 9, 14, 0.92);
  --site-header-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  --site-header-border: rgba(255, 255, 255, 0.08);
  --site-border: rgba(255, 255, 255, 0.08);
  --site-border-accent: rgba(99, 102, 241, 0.35);
  --site-text-main: #f8fafc;
  --site-text-muted: #94a3b8;
  --site-text-dark: #64748b;
  --site-cyan: #38bdf8;
  --site-toggle-bg: rgba(255, 255, 255, 0.06);
  --site-toggle-hover: rgba(255, 255, 255, 0.12);
  --site-toggle-border: rgba(255, 255, 255, 0.1);
  --site-footer-bg: transparent;
}

[data-theme="light"] {
  --site-header-bg: rgba(248, 250, 252, 0.92);
  --site-header-shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
  --site-header-border: rgba(15, 23, 42, 0.09);
  --site-border: rgba(15, 23, 42, 0.09);
  --site-border-accent: rgba(99, 102, 241, 0.45);
  --site-text-main: #0f172a;
  --site-text-muted: #475569;
  --site-text-dark: #64748b;
  --site-cyan: #0284c7;
  --site-toggle-bg: rgba(15, 23, 42, 0.06);
  --site-toggle-hover: rgba(15, 23, 42, 0.12);
  --site-toggle-border: rgba(15, 23, 42, 0.12);
  --site-footer-bg: transparent;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --site-header-bg: rgba(248, 250, 252, 0.92);
    --site-header-shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
    --site-header-border: rgba(15, 23, 42, 0.09);
    --site-border: rgba(15, 23, 42, 0.09);
    --site-border-accent: rgba(99, 102, 241, 0.45);
    --site-text-main: #0f172a;
    --site-text-muted: #475569;
    --site-text-dark: #64748b;
    --site-cyan: #0284c7;
    --site-toggle-bg: rgba(15, 23, 42, 0.06);
    --site-toggle-hover: rgba(15, 23, 42, 0.12);
    --site-toggle-border: rgba(15, 23, 42, 0.12);
  }
}

html {
  scroll-padding-top: 72px;
}

body {
  padding-top: 72px;
}

/* ==========================================================================
   STICKY SITE HEADER (72px)
   ========================================================================== */
header.site-header {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  width: 100% !important;
  height: 72px !important;
  margin: 0 !important;
  padding: 0 !important;
  z-index: 1000 !important;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: var(--site-header-bg) !important;
  border-bottom: 1px solid var(--site-header-border) !important;
  border-top: none !important;
  border-left: none !important;
  border-right: none !important;
  box-shadow: var(--site-header-shadow);
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
  box-sizing: border-box !important;
  display: block !important;
}

.site-header__container,
header.site-header .nav-bar {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
  height: 72px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-sizing: border-box;
}

/* Brand */
.site-brand,
header.site-header .brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--site-text-main);
  flex-shrink: 0;
}

.site-brand__logo,
header.site-header .brand-logo {
  width: 44px;
  height: 44px;
  border-radius: 11px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5), 0 0 16px rgba(56, 189, 248, 0.25);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease;
  flex-shrink: 0;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  transform: translateZ(0);
}

[data-theme="light"] .site-brand__logo,
[data-theme="light"] header.site-header .brand-logo {
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.15), 0 0 16px rgba(56, 189, 248, 0.2);
}

.site-brand:hover .site-brand__logo,
header.site-header .brand:hover .brand-logo {
  transform: scale(1.08) translateY(-1px) translateZ(0);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6), 0 0 24px rgba(56, 189, 248, 0.5);
}

.site-brand__logo img,
header.site-header .brand-logo img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.site-brand__text,
header.site-header .brand-text {
  display: flex;
  flex-direction: column;
}

.site-brand__title,
header.site-header .brand-title {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #ffffff 40%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
  line-height: 1.2;
}

[data-theme="light"] .site-brand__title,
[data-theme="light"] header.site-header .brand-title {
  background: linear-gradient(135deg, #0f172a 40%, #475569 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.site-brand__sub,
header.site-header .brand-sub {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--site-cyan);
  text-transform: uppercase;
  white-space: nowrap;
  margin-top: 1px;
}

/* Nav Actions & Links */
.site-nav-actions,
header.site-header .nav-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

.site-nav-links,
header.site-header .nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav-links li,
header.site-header .nav-links li {
  margin: 0;
  padding: 0;
}

.site-nav-links a,
header.site-header .nav-links a {
  color: var(--site-text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: color 0.2s ease;
  white-space: nowrap;
}

.site-nav-links a:hover,
header.site-header .nav-links a:hover {
  color: var(--site-text-main);
}

.site-nav-link-parental {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.site-nav-manifest,
header.site-header .btn-manifest {
  background: linear-gradient(135deg, #4f46e5 0%, #3b82f6 100%);
  color: #fff !important;
  padding: 10px 20px;
  border-radius: 999px;
  font-weight: 700 !important;
  font-size: 13.5px !important;
  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.35);
  display: inline-flex;
  align-items: center;
  gap: 7px;
  transition: transform 0.2s ease, box-shadow 0.2s ease !important;
  text-decoration: none;
}

.site-nav-manifest:hover,
header.site-header .btn-manifest:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.5);
}

.site-nav-login,
header.site-header .nav-login {
  background: linear-gradient(135deg, #6366f1 0%, #3b82f6 100%);
  color: #fff !important;
  padding: 9px 18px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 13.5px;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  display: inline-flex;
  align-items: center;
}

.site-nav-login:hover,
header.site-header .nav-login:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(79, 70, 229, 0.5);
}

.site-nav-locale,
header.site-header .nav-locale {
  color: var(--site-text-muted);
}

.site-header .evg-icon {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

/* Header Theme Toggle Button */
.site-theme-toggle,
header.site-header .theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  border: 1px solid var(--site-toggle-border);
  background: var(--site-toggle-bg);
  color: var(--site-text-main);
  cursor: pointer;
  display: flex !important;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
  -webkit-tap-highlight-color: transparent;
  padding: 0;
}

.site-theme-toggle:hover,
header.site-header .theme-toggle:hover {
  background: var(--site-toggle-hover);
  border-color: var(--site-border-accent);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.25);
}

.site-theme-toggle:active,
header.site-header .theme-toggle:active {
  transform: scale(0.94);
}

.site-theme-toggle .theme-toggle-icon,
header.site-header .theme-toggle-icon {
  position: absolute;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.25s ease, transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), color 0.25s ease;
  pointer-events: none;
}

.site-theme-toggle .theme-toggle-icon svg,
header.site-header .theme-toggle-icon svg {
  width: 20px;
  height: 20px;
}

/* Dark mode active: show sun */
.site-theme-toggle .icon-sun,
header.site-header .icon-sun {
  opacity: 1;
  transform: rotate(0) scale(1);
  color: #fbbf24;
  filter: drop-shadow(0 0 6px rgba(251, 191, 36, 0.45));
}

.site-theme-toggle .icon-moon,
header.site-header .icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
  color: #818cf8;
}

/* Light mode active: show moon */
[data-theme="light"] .site-theme-toggle .icon-sun,
[data-theme="light"] header.site-header .icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

[data-theme="light"] .site-theme-toggle .icon-moon,
[data-theme="light"] header.site-header .icon-moon {
  opacity: 1;
  transform: rotate(0) scale(1);
  color: #6366f1;
  filter: drop-shadow(0 0 6px rgba(99, 102, 241, 0.35));
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .site-theme-toggle .icon-sun,
  :root:not([data-theme="dark"]) header.site-header .icon-sun {
    opacity: 0;
    transform: rotate(90deg) scale(0.5);
  }
  :root:not([data-theme="dark"]) .site-theme-toggle .icon-moon,
  :root:not([data-theme="dark"]) header.site-header .icon-moon {
    opacity: 1;
    transform: rotate(0) scale(1);
    color: #6366f1;
    filter: drop-shadow(0 0 6px rgba(99, 102, 241, 0.35));
  }
}

/* Header Responsiveness */
@media (max-width: 1200px) {
  .site-nav-links,
  header.site-header .nav-links {
    display: none !important;
  }
}

@media (max-width: 560px) {
  .site-nav-actions,
  header.site-header .nav-actions {
    gap: 8px;
  }
  .site-brand__sub,
  header.site-header .brand-sub {
    display: none !important;
  }
  .site-nav-locale .locale-switch__field,
  header.site-header .nav-locale .locale-switch__field {
    padding: 0 6px;
  }
  .site-nav-locale .locale-switch__select,
  header.site-header .nav-locale .locale-switch__select {
    max-width: 6.5em;
  }
}

@media (max-width: 440px) {
  .site-brand__text,
  header.site-header .brand-text {
    display: none !important;
  }
}

/* ==========================================================================
   UNIFIED SITE FOOTER
   ========================================================================== */
footer.site-footer {
  border-top: 1px solid var(--site-border) !important;
  padding: 40px 0 !important;
  color: var(--site-text-dark) !important;
  font-size: 13px !important;
  background: var(--site-footer-bg) !important;
  width: 100% !important;
  box-sizing: border-box !important;
  margin-top: auto;
  text-align: left !important;
}

.site-footer__container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  box-sizing: border-box;
  text-align: left !important;
}

.site-footer__brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-align: left !important;
}

.site-footer__logo {
  border-radius: 10px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.5), 0 0 12px rgba(56, 189, 248, 0.25);
  display: block;
  flex-shrink: 0;
}

[data-theme="light"] .site-footer__logo {
  box-shadow: 0 4px 14px rgba(15, 23, 42, 0.12), 0 0 12px rgba(56, 189, 248, 0.2);
}

.site-footer__title {
  font-weight: 800;
  font-size: 15px;
  color: var(--site-text-main);
  letter-spacing: -0.3px;
  line-height: 1.2;
  text-align: left !important;
}

.site-footer__sub {
  font-size: 10.5px;
  color: var(--site-cyan);
  letter-spacing: 1.2px;
  text-transform: uppercase;
  font-weight: 700;
  margin-top: 2px;
  text-align: left !important;
}

.site-footer__info {
  color: var(--site-text-dark);
  font-size: 13px;
  text-align: right;
  line-height: 1.6;
}

.site-footer__links {
  margin-top: 6px;
}

.site-footer__links a {
  color: var(--site-cyan);
  font-weight: 700;
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.site-footer__links a:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  .site-footer__container {
    flex-direction: column;
    text-align: center;
    justify-content: center;
    gap: 16px;
  }
  .site-footer__info {
    text-align: center !important;
  }
}

/* PWA update notifications appear only inside the web application (/learn, /cabinet), never on the public landing/promo site */
#evg-pwa-update {
  display: none !important;
}