.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: radial-gradient(circle at top left, var(--color-bg-grad-1), transparent 55%),
    radial-gradient(circle at bottom right, var(--color-bg-grad-3), transparent 55%),
    var(--color-surface-soft);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: background 0.35s ease, border-color 0.35s ease;
}

.site-header-inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
  min-height: var(--nav-height);
  padding-block: var(--space-2);
}

.site-nav {
  justify-self: center;
}

.site-nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-1) var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-soft);
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-sm);
  transition:
    color var(--transition-fast),
    background var(--transition-fast),
    transform var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.75rem;
}

.nav-link:hover {
  color: var(--color-text-main);
  background: var(--color-primary-soft);
}

.nav-link:active {
  transform: scale(0.98);
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

header.site-header .nav-link--active {
  color: var(--color-primary-strong);
  background: rgba(37, 99, 235, 0.1);
}

[data-theme="dark"] header.site-header .nav-link--active {
  color: var(--color-primary);
  background: rgba(56, 189, 248, 0.12);
}

.site-footer .nav-link--active {
  color: var(--color-primary-strong);
  background: transparent;
}

[data-theme="dark"] .site-footer .nav-link--active {
  color: var(--color-primary);
}

.site-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  justify-self: end;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-menu-toggle {
  display: none;
  position: relative;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-subtle);
  background: var(--color-surface-soft);
  color: var(--color-text-soft);
  cursor: pointer;
  transition:
    color var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.nav-menu-toggle:hover {
  color: var(--color-primary);
  border-color: var(--color-primary-soft);
  background: var(--color-primary-soft);
}

.nav-menu-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.nav-menu-icon {
  display: block;
  pointer-events: none;
}

.nav-menu-icon--close {
  display: none;
}

.site-header--nav-open .nav-menu-icon--open {
  display: none;
}

.site-header--nav-open .nav-menu-icon--close {
  display: block;
}

.btn-sm {
  padding: 0.45rem 1rem;
  font-size: 0.82rem;
}

a.brand-wordmark {
  text-decoration: none;
  color: inherit;
  justify-self: start;
}

@media (max-width: 767px) {
  .site-header-inner {
    grid-template-columns: 1fr auto;
    grid-template-rows: auto auto;
  }

  a.brand-wordmark {
    grid-column: 1;
    grid-row: 1;
  }

  .site-header-actions {
    grid-column: 2;
    grid-row: 1;
  }

  .site-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: stretch;
    display: none;
    padding-top: var(--space-3);
    margin-top: var(--space-2);
    border-top: 1px solid var(--color-border-subtle);
  }

  .site-header--nav-open .site-nav {
    display: block;
  }

  .site-nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-1);
  }

  .site-nav .nav-link {
    justify-content: flex-start;
    width: 100%;
    padding-inline: var(--space-3);
  }

  .nav-menu-toggle {
    display: inline-flex;
  }

}

@media (min-width: 768px) {
  .site-nav {
    display: block !important;
  }

  .nav-menu-toggle {
    display: none !important;
  }
}

html.nav-drawer-open,
body.nav-drawer-open {
  overflow: hidden;
}

body.nav-drawer-open {
  padding-right: var(--scrollbar-compensate, 0px);
}

/* No-JS fallback (content inside #site-header-mount / #site-footer-mount) */
.noscript-chrome {
  padding: var(--space-4) var(--container-padding-x);
  border-bottom: 1px solid var(--color-border-subtle);
  background: var(--color-surface-soft);
}

.noscript-footer.noscript-chrome {
  border-bottom: none;
  border-top: 1px solid var(--color-border-subtle);
  margin-top: auto;
}

.noscript-nav .noscript-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-4);
  list-style: none;
  margin: 0 0 var(--space-3);
  padding: 0;
}

.noscript-nav a {
  font-weight: 500;
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.noscript-note,
.noscript-hint {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-soft);
  max-width: 40rem;
}

.noscript-brand {
  margin: 0 0 var(--space-2);
  font-weight: 600;
}

.noscript-copy {
  margin: var(--space-2) 0 0;
  font-size: 0.82rem;
  color: var(--color-text-subtle);
}

/* Theme toggle: moon (light) / sun (dark) */
.theme-toggle {
  --toggle-size: 2.25rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: var(--toggle-size);
  height: var(--toggle-size);
  border-radius: var(--radius-pill);
  background: var(--color-surface-soft);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-soft);
  cursor: pointer;
  transition: transform 0.35s ease, box-shadow 0.35s ease, background 0.35s ease, border-color 0.35s ease, color 0.35s ease;
}

.theme-toggle:hover {
  color: var(--color-primary);
  transform: scale(1.08);
  box-shadow: 0 0 20px var(--color-primary-soft);
}

.theme-toggle:focus {
  outline: none;
}

.theme-toggle:focus-visible {
  box-shadow: 0 0 0 2px var(--color-primary);
}

.theme-toggle-track {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
}

.theme-toggle-icon {
  position: absolute;
  transition: opacity 0.3s ease, transform 0.35s ease;
  pointer-events: none;
}

.theme-toggle-moon {
  opacity: 1;
  transform: rotate(0deg);
}

.theme-toggle-sun {
  opacity: 0;
  transform: rotate(-90deg);
}

[data-theme="dark"] .theme-toggle-moon {
  opacity: 0;
  transform: rotate(90deg);
}

[data-theme="dark"] .theme-toggle-sun {
  opacity: 1;
  transform: rotate(0deg);
}

[data-theme="dark"] .theme-toggle:hover {
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.35);
}

[data-theme="dark"] .brand-wordmark {
  border-color: var(--color-border-subtle);
  background: radial-gradient(circle at top left, rgba(26, 34, 52, 0.98), rgba(21, 27, 40, 0.95));
  box-shadow: var(--shadow-soft);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.brand-name {
  font-size: 0.9rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.brand-tagline {
  font-size: 0.78rem;
  color: var(--color-text-soft);
}

.brand-wordmark .brand-name {
  font-family: "Space Grotesk", system-ui, -apple-system, BlinkMacSystemFont, "Inter", "SF Pro Text", "Segoe UI", sans-serif;
  font-size: 1.08rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  background: linear-gradient(120deg, var(--color-accent-electric), var(--color-accent-cyan), var(--color-accent-violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-flex;
  cursor: default;
}

.brand-wordmark {
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.45);
  background: radial-gradient(circle at top left, rgba(255, 255, 255, 0.95), rgba(248, 250, 252, 0.88));
  box-shadow: 0 12px 40px rgba(15, 23, 42, 0.15);
  transform-origin: center;
  animation: brand-wordmark-pulse 2000ms linear infinite;
}

.brand-letter {
  display: inline-block;
  background: linear-gradient(120deg, var(--color-accent-electric), var(--color-accent-cyan), var(--color-accent-violet));
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  transform: translateY(0);
  animation:
    brand-wordmark-wave 620ms ease-out both,
    brand-letter-shimmer 3600ms ease-in-out infinite alternate;
  animation-delay: var(--brand-letter-delay, 0s), var(--brand-shimmer-offset, 0s);
  transition: color 220ms ease-out, filter 320ms ease-in-out;
}

.brand-letter[data-char=" "] {
  width: 0.5em;
}

@keyframes brand-wordmark-wave {
  0% {
    transform: translateY(0);
    background-position: 0% 50%;
  }
  30% {
    transform: translateY(-2px);
    background-position: 50% 50%;
  }
  60% {
    transform: translateY(1px);
    background-position: 100% 50%;
  }
  100% {
    transform: translateY(0);
    background-position: 50% 50%;
  }
}

@keyframes brand-letter-shimmer {
  0% {
    opacity: 0.92;
    filter: brightness(1);
  }
  50% {
    opacity: 1;
    filter: brightness(1.06);
  }
  100% {
    opacity: 0.96;
    filter: brightness(1);
  }
}

.brand-wordmark:hover .brand-letter {
  animation:
    brand-letter-hue 1800ms linear infinite,
    brand-letter-shimmer 3600ms ease-in-out infinite alternate;
  animation-delay: var(--brand-letter-delay, 0s), var(--brand-shimmer-offset, 0s);
  animation-iteration-count: infinite, infinite;
}

@keyframes brand-letter-hue {
  0% {
    background-position: 0% 50%;
  }
  33% {
    background-position: 50% 50%;
  }
  66% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

@keyframes brand-wordmark-pulse {
  0% {
    transform: scale(1);
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.15);
  }
  35% {
    transform: scale(1.035);
    box-shadow: 0 16px 48px rgba(15, 23, 42, 0.22);
  }
  70% {
    transform: scale(1.01);
    box-shadow: 0 13px 42px rgba(15, 23, 42, 0.18);
  }
  100% {
    transform: scale(1);
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.15);
  }
}

.btn {
  border-radius: var(--radius-pill);
  padding: 0.55rem 1.3rem;
  font-size: 0.88rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  transition: background 0.35s ease, background-position 0.35s ease, color 0.35s ease, box-shadow 0.35s ease, transform 0.35s ease, border-color 0.35s ease, opacity 0.2s ease;
}

.btn:disabled {
  opacity: 0.88;
  cursor: not-allowed;
  transform: none;
  pointer-events: none;
}

/* Primary button: clean gradient, subtle hover (lift + gradient shift + soft shadow) */
.btn-primary {
  background: linear-gradient(
    135deg,
    var(--color-primary) 0%,
    var(--color-accent-cyan) 50%,
    var(--color-primary) 100%
  );
  background-size: 200% 100%;
  background-position: 0% 50%;
  color: #f8fafc;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.btn-primary:hover {
  transform: translateY(-1px);
  background-position: 100% 50%;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

/* Dark theme: only gradient colors; no hover overrides — .btn-primary:hover applies as-is */
[data-theme="dark"] .btn-primary {
  background-image: linear-gradient(
    135deg,
    #1e40af 0%,
    #0891b2 50%,
    #1e40af 100%
  );
  background-size: 200% 100%;
}

.btn-ghost {
  color: var(--color-text-soft);
  border: 1px solid var(--color-border-subtle);
  background: var(--color-surface);
}

.btn-ghost:hover {
  color: var(--color-text-main);
  border-color: var(--color-border);
  transform: translateY(-1px);
}

/* Hero — landing block (scrollable page) */
.hero {
  display: flex;
  align-items: center;
  padding-block: var(--space-16);
  position: relative;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  inset: -120px -80px auto;
  pointer-events: none;
  z-index: -1;
  opacity: 0.85;
  filter: blur(40px);
}

.hero::before {
  background: radial-gradient(circle at 0% 0%, rgba(56, 189, 248, 0.55), transparent 60%);
}

.hero::after {
  background: radial-gradient(circle at 90% 10%, rgba(124, 58, 237, 0.4), transparent 60%);
}

.hero-grid {
  display: grid;
  gap: var(--space-5);
  width: 100%;
}

.hero-copy {
  max-width: 34rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

/* Right-hand panel: title with animated brand-color gradient only */
.hero-media {
  position: relative;
  --fs: clamp(2.25rem, 5vw + 1rem, 4.5rem);
  --ls: clamp(-1.75px, -0.25vw, -3.5px);

  display: grid;
  place-items: center;
}

.hero-media .content {
  text-align: center;
}

.hero-media .title {
  font-family: var(--font-sans);
  font-size: var(--fs);
  font-weight: 800;
  letter-spacing: var(--ls);
  margin: 0;
  padding: 0.15em 0;
}

/* Animated gradient: cyan → blue → violet cycles through the text */
.hero-media .title-text {
  display: block;
  background: linear-gradient(
    120deg,
    var(--color-accent-cyan) 0%,
    var(--color-primary) 35%,
    var(--color-accent-violet) 70%,
    var(--color-accent-cyan) 100%
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: title-gradient-shift 6s ease-in-out infinite;
}

@keyframes title-gradient-shift {
  0%, 100% { background-position: 0% center; }
  50% { background-position: 100% center; }
}

.card {
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.92), rgba(248, 250, 252, 0.9));
  border: 1px solid rgba(148, 163, 184, 0.35);
  box-shadow: 0 22px 60px rgba(15, 23, 42, 0.12);
  padding: var(--space-5);
  backdrop-filter: blur(18px);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: -40%;
  background: radial-gradient(circle at top, rgba(56, 189, 248, 0.18), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-med), transform var(--transition-med);
  transform: translateY(12px);
}

.card:hover::before {
  opacity: 1;
  transform: translateY(0);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
  gap: var(--space-3);
}

.card-title {
  font-size: 1.02rem;
  letter-spacing: -0.02em;
}

.card-icon {
  display: inline-flex;
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 0.9rem;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 0 0, rgba(59, 130, 246, 0.18), rgba(56, 189, 248, 0.1));
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.18);
}

.card-icon svg {
  width: 1.4rem;
  height: 1.4rem;
  fill: none;
  stroke: url(#card-icon-gradient);
  stroke-width: 1.6;
}

.card-icon svg rect,
.card-icon svg path,
.card-icon svg circle {
  stroke: currentColor;
}

.card:hover {
  transform: translateY(-2px);
}

[data-theme="dark"] .card {
  background: linear-gradient(135deg, rgba(26, 34, 52, 0.96), rgba(17, 24, 39, 0.94));
  border-color: var(--color-border-subtle);
  box-shadow: var(--shadow-soft);
}

/* Inner page hero */
.page-hero {
  padding-block: var(--space-12) var(--space-8);
}

.page-hero .heading-xl {
  margin: 0 0 var(--space-4);
}

.page-hero .eyebrow {
  margin: 0 0 var(--space-3);
}

.page-hero-lead {
  max-width: 40rem;
  margin: 0;
}

/* Site footer */
.site-footer {
  margin-top: auto;
  padding-block: var(--space-10);
  border-top: 1px solid var(--color-border-subtle);
  background: radial-gradient(circle at bottom, var(--color-bg-grad-3), transparent 55%),
    var(--color-surface-soft);
}

.site-footer-inner {
  display: grid;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .site-footer-inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }
}

.site-footer-brand .footer-brand-name {
  font-family: var(--font-sans);
  font-size: 1.08rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: linear-gradient(120deg, var(--color-accent-electric), var(--color-accent-cyan), var(--color-accent-violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  display: inline-block;
  margin-bottom: var(--space-2);
}

.site-footer-tagline {
  margin: 0;
  font-size: 0.88rem;
  color: var(--color-text-soft);
  max-width: 18rem;
}

.site-footer-nav .site-nav-list {
  flex-direction: column;
  align-items: flex-start;
}

.site-footer-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  font-size: 0.9rem;
  color: var(--color-text-soft);
}

.site-footer-meta a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.site-footer-meta a:hover {
  color: var(--color-primary-strong);
}

.copyright {
  margin: 0;
  font-size: 0.82rem;
  color: var(--color-text-subtle);
}

/* Forms (shared) */
.form-feedback {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  line-height: 1.5;
  scroll-margin-top: calc(var(--nav-height) + 1rem);
}

.form-feedback:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.form-feedback[hidden] {
  display: none !important;
}

.form-feedback--success {
  background: rgba(34, 197, 94, 0.12);
  border: 1px solid rgba(34, 197, 94, 0.35);
  color: var(--color-text-main);
}

[data-theme="dark"] .form-feedback--success {
  background: rgba(34, 197, 94, 0.08);
  border-color: rgba(34, 197, 94, 0.28);
}

.form-feedback--error {
  background: rgba(220, 38, 38, 0.08);
  border: 1px solid rgba(220, 38, 38, 0.35);
  color: var(--color-text-main);
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-main);
}

.form-label-hint {
  font-weight: 400;
  color: var(--color-text-subtle);
}

.form-input,
.form-textarea {
  width: 100%;
  max-width: 100%;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-subtle);
  background: var(--color-surface);
  color: var(--color-text-main);
  font: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px var(--color-primary-soft);
}

.form-textarea {
  min-height: 9rem;
  resize: vertical;
}

.form-field-error {
  font-size: 0.8rem;
  color: var(--color-danger);
  min-height: 1.1em;
}

.form-field-error[hidden] {
  display: none !important;
}

.form-field--invalid .form-input,
.form-field--invalid .form-textarea {
  border-color: var(--color-danger);
}

.error-page {
  padding-block: var(--space-20);
  text-align: center;
}

.error-page .heading-xl {
  margin-bottom: var(--space-4);
}

.error-page-lead {
  max-width: 28rem;
  margin-inline: auto;
}

.error-page-actions {
  margin: 0;
}

@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.1fr);
    align-items: center;
  }

  .hero-media {
    padding-left: var(--space-5);
  }

}