/* Vault Thunder Board — neon header base styles */

/* Header container + sticky polish */
header.vtb-header {
  position: sticky;
  top: 0;
  z-index: 70;
  --vtb-header-primary-color: var(--vtb-header-primary, var(--brand, #5b82ff));
  --vtb-header-primary-glow: color-mix(in srgb, var(--vtb-header-primary-color) 24%, rgba(10, 17, 36, 0.94));
  --vtb-header-primary-glow-deep: color-mix(in srgb, var(--vtb-header-primary-color) 20%, rgba(7, 12, 28, 0.85));
  --vtb-header-primary-glow-base: color-mix(in srgb, var(--vtb-header-primary-color) 16%, rgba(3, 6, 18, 0.82));
  --vtb-header-primary-border: color-mix(in srgb, var(--vtb-header-primary-color) 70%, rgba(15, 23, 42, 0.9));
  --vtb-header-primary-border-soft: color-mix(in srgb, var(--vtb-header-primary-color) 28%, rgba(63, 70, 86, 0.9));
  background:
    linear-gradient(
      180deg,
      var(--vtb-header-primary-glow) 0%,
      var(--vtb-header-primary-glow-deep) 55%,
      var(--vtb-header-primary-glow-base) 100%
    );
  backdrop-filter: saturate(170%) blur(12px);
  border-bottom: 2px solid transparent;
  border-image: linear-gradient(
      90deg,
      var(--vtb-header-primary-border) 0 55%,
      var(--vtb-header-primary-border-soft) 55%
    ) 1;
  box-shadow:
    0 22px 40px rgba(8, 12, 24, 0.65),
    inset 0 0 0 1px rgba(94, 234, 212, 0.04);
  color: #f8fafc;
  overflow: visible;
}

.vtb-header {
  display: block;
  color: inherit;
  padding: 0;
}

.vtb-header__fx {
  position: absolute;
  top: -30%;
  bottom: -30%;
  left: 50%;
  right: auto;
  width: min(1200px, 100vw);
  transform: translateX(-50%);
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.vtb-header__glow {
  position: absolute;
  inset: 10% 12%;
  background:
    radial-gradient(62% 55% at 20% 35%, color-mix(in srgb, var(--vtb-header-primary-color) 72%, transparent) 0%, transparent 72%),
    radial-gradient(58% 50% at 82% 25%, color-mix(in srgb, var(--vtb-header-primary-color) 48%, rgba(45, 212, 191, 0.42)) 0%, transparent 74%),
    radial-gradient(80% 50% at 50% 100%, color-mix(in srgb, var(--vtb-header-primary-color) 24%, rgba(226, 40, 55, 0.26)) 0%, transparent 90%);
  filter: blur(28px);
  opacity: 0.72;
  animation: vtb-header-pulse 6.5s ease-in-out infinite;
}

.vtb-header__glow::before,
.vtb-header__glow::after {
  content: "";
  position: absolute;
  inset: -15% -10% 65%;
  background: radial-gradient(65% 50% at 15% 40%, color-mix(in srgb, var(--vtb-header-primary-color) 65%, transparent) 0%, transparent 75%);
  filter: blur(22px);
  opacity: 0.65;
}

.vtb-header__glow::after {
  inset: 45% -5% -20%;
  background: radial-gradient(70% 60% at 70% 70%, color-mix(in srgb, var(--vtb-header-primary-color) 52%, rgba(45, 212, 191, 0.6)) 0%, transparent 78%);
}

.vtb-header__beam {
  position: absolute;
  pointer-events: none;
  mix-blend-mode: screen;
  opacity: 0.65;
}

.vtb-header__beam::before,
.vtb-header__beam::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 999px;
}

.vtb-header__beam--bottom {
  left: -6%;
  right: -6%;
  bottom: -28%;
  height: 3px;
  background: linear-gradient(
    90deg,
    transparent,
    color-mix(in srgb, var(--vtb-header-primary-color) 78%, transparent) 45%,
    color-mix(in srgb, var(--vtb-header-primary-color) 85%, rgba(148, 163, 184, 0.12)) 55%,
    transparent
  );
  filter: blur(8px);
  opacity: 0.55;
  animation: vtb-header-shimmer 7s linear infinite;
}

.vtb-header__beam--bottom::before {
  background: inherit;
  filter: blur(18px);
}

@keyframes vtb-header-pulse {
  0%,
  100% {
    opacity: 0.62;
    transform: scale(0.98);
  }
  45% {
    opacity: 0.9;
    transform: scale(1);
  }
}

@keyframes vtb-header-shimmer {
  0% {
    opacity: 0;
    transform: translateX(-120%);
  }
  40% {
    opacity: 0.75;
    transform: translateX(0);
  }
  100% {
    opacity: 0;
    transform: translateX(120%);
  }
}

.vtb-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  position: relative;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 18px;
  z-index: 1;
}

.vtb-header__brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.vtb-header__brand .brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 1.05rem;
  text-decoration: none;
  color: inherit;
}

.brand-wordmark {
  text-transform: uppercase;
  font-size: 1.08rem;
  letter-spacing: 0.18em;
}

.site-branding,
.site-logo,
.site-branding > a,
.site-logo > a {
  overflow: visible !important;
}

img.brand-logo {
  display: block;
  width: auto;
  height: 34px;
  transform-origin: left center;
  transform: scale(3.3);
}

@media (max-width: 480px) {
  .vtb-header__inner {
    padding: 14px 16px;
  }

  img.brand-logo {
    transform: scale(3.5);
  }
}

@media (min-width: 768px) {
  img.brand-logo {
    height: 36px;
    transform: scale(3.2);
  }
}

.vtb-header nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  position: relative;
  z-index: 1;
}

.vtb-header__menu {
  display: flex;
  align-items: center;
  gap: 18px;
}

.vtb-header__links {
  display: flex;
  align-items: center;
  gap: 12px;
}

.vtb-header .btn,
.vtb-header .vtb-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  border-radius: 14px;
  font-weight: 600;
  background: rgba(15, 23, 42, 0.45);
  border: 1px solid rgba(148, 163, 184, 0.24);
  color: rgba(226, 232, 240, 0.9);
  transition: color 0.18s ease, background 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.vtb-header .btn:hover,
.vtb-header .btn:focus-visible,
.vtb-header .vtb-btn:hover,
.vtb-header .vtb-btn:focus-visible {
  background: rgba(30, 64, 175, 0.55);
  border-color: rgba(147, 197, 253, 0.55);
  color: #f8fafc;
  box-shadow: 0 8px 24px rgba(59, 130, 246, 0.35);
}

.vtb-header .btn.is-active,
.vtb-header .vtb-btn.is-active {
  background: rgba(30, 64, 175, 0.65);
  border-color: rgba(96, 165, 250, 0.7);
  color: #f8fafc;
  box-shadow: 0 0 0 1px rgba(148, 197, 253, 0.3) inset;
}

.vtb-header__cta {
  display: none;
}

.vtb-header__cta-link {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  min-width: 180px;
  padding: 12px 18px;
  border-radius: 16px;
  border: 1px solid rgba(34, 211, 238, 0.35);
  background: linear-gradient(
    130deg,
    color-mix(in srgb, var(--vtb-header-primary-color) 88%, transparent),
    color-mix(in srgb, var(--vtb-header-primary-color) 32%, rgba(34, 211, 238, 0.48)),
    color-mix(in srgb, var(--vtb-header-primary-color) 68%, #2563eb 32%)
  );
  box-shadow:
    0 16px 36px rgba(15, 23, 42, 0.55),
    0 0 24px color-mix(in srgb, var(--vtb-header-primary-color) 55%, rgba(45, 212, 191, 0.6));
  color: #f8fafc;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  transition: transform 0.22s ease, box-shadow 0.22s ease, filter 0.22s ease;
}

.vtb-header__cta-link:hover,
.vtb-header__cta-link:focus-visible {
  transform: translateY(-1px) scale(1.01);
  box-shadow:
    0 22px 44px rgba(15, 23, 42, 0.65),
    0 0 28px rgba(45, 212, 191, 0.4);
  filter: brightness(1.05);
}

.vtb-header__cta-main {
  font-size: 0.76rem;
  letter-spacing: 0.22em;
}

.vtb-header__cta-sub {
  margin-top: 4px;
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  text-transform: none;
  font-weight: 500;
  color: rgba(226, 232, 240, 0.82);
}

.vtb-burger {
  margin-left: auto;
  width: 46px;
  height: 46px;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.28);
  background: linear-gradient(
    160deg,
    color-mix(in srgb, var(--vtb-header-primary-color) 18%, rgba(15, 23, 42, 0.85)),
    color-mix(in srgb, var(--vtb-header-primary-color) 12%, rgba(30, 41, 59, 0.68))
  );
  box-shadow:
    0 16px 28px rgba(7, 11, 22, 0.65),
    0 0 0 1px rgba(148, 163, 184, 0.22) inset;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.vtb-burger:hover,
.vtb-burger:focus-visible {
  border-color: rgba(148, 197, 253, 0.65);
  background: linear-gradient(
    160deg,
    color-mix(in srgb, var(--vtb-header-primary-color) 26%, rgba(15, 23, 42, 0.95)),
    color-mix(in srgb, var(--vtb-header-primary-color) 22%, rgba(30, 64, 175, 0.55))
  );
  box-shadow:
    0 20px 38px rgba(7, 11, 22, 0.72),
    0 0 0 1px rgba(147, 197, 253, 0.35) inset;
}

.vtb-burger__bar {
  width: 20px;
  height: 2px;
  background: var(--vtb-header-primary-color);
  border-radius: 2px;
  display: block;
}

.vtb-burger__bar + .vtb-burger__bar {
  margin-top: 4px;
}

/* Burger morph animation */
.vtb-burger .vtb-burger__bar,
.vtb-burger .vtb-burger_bar {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -8px);
  transition: transform 0.18s ease, opacity 0.18s ease;
  margin: 0;
}

.vtb-burger .vtb-burger__bar:nth-child(2),
.vtb-burger .vtb-burger_bar:nth-child(2) {
  transform: translate(-50%, 0);
}

.vtb-burger .vtb-burger__bar:nth-child(3),
.vtb-burger .vtb-burger_bar:nth-child(3) {
  transform: translate(-50%, 8px);
}

.vtb-burger.is-open .vtb-burger__bar:nth-child(1),
.vtb-burger.is-open .vtb-burger_bar:nth-child(1) {
  transform: translate(-50%, 0) rotate(45deg);
}

.vtb-burger.is-open .vtb-burger__bar:nth-child(2),
.vtb-burger.is-open .vtb-burger_bar:nth-child(2) {
  opacity: 0;
  transform: translate(-50%, 0) scaleX(0.6);
}

.vtb-burger.is-open .vtb-burger__bar:nth-child(3),
.vtb-burger.is-open .vtb-burger_bar:nth-child(3) {
  transform: translate(-50%, 0) rotate(-45deg);
}

@media (min-width: 901px) {
  .vtb-burger {
    display: none;
  }
}

#vtb-primary {
  display: block;
}

@media (max-width: 900px) {
  #vtb-primary {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin-left: 0;
    padding: 16px 18px;
    background: rgba(6, 10, 20, 0.96);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    display: none;
    pointer-events: none;
    z-index: 1;
  }

  #vtb-primary.is-open {
    display: grid;
    gap: 18px;
    pointer-events: auto;
  }

  #vtb-primary .vtb-header__menu {
    display: grid;
    gap: 18px;
  }

  #vtb-primary .vtb-header__links {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  #vtb-primary .btn {
    width: 100%;
    text-align: center;
  }

  #vtb-primary .vtb-header__cta {
    justify-content: stretch;
  }

  #vtb-primary .vtb-header__cta-link {
    width: 100%;
    align-items: center;
    text-align: center;
  }

  .vtb-burger {
    display: inline-flex;
  }
}