/* ============================================================
   HEADER & FOOTER - Modern, clean navigation
   ============================================================ */

/* ============================================================
   SITE HEADER - Fixed, translucent backdrop
   ============================================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-h);
  background: color-mix(in srgb, var(--bg-base) 90%, transparent);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border-bottom: 1px solid var(--line);
  transition: background var(--dur) var(--ease-out);
}

.site-header .container {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

/* ============================================================
   WORDMARK / LOGO
   ============================================================ */

.wordmark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  min-height: 48px;
  touch-action: manipulation;
  transition: color var(--dur) var(--ease-out);
}

.wordmark:hover {
  color: var(--accent);
}

.wordmark em {
  font-style: normal;
  font-weight: 400;
  margin-left: 0.25rem;
}

/* ============================================================
   PRIMARY NAVIGATION
   ============================================================ */

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.2rem, 2.5vw, 2rem);
}

.site-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--text-secondary);
  padding: 0.5rem 0.25rem;
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  touch-action: manipulation;
  transition: color var(--dur) var(--ease-out);
}

/* Animated underline */
.site-nav a::after {
  content: "";
  position: absolute;
  bottom: 0.3rem;
  left: 0;
  right: 100%;
  height: 2px;
  background: var(--accent);
  transition: right var(--dur) var(--ease-out);
}

.site-nav a:hover {
  color: var(--text-primary);
}

.site-nav a:hover::after {
  right: 0;
}

/* CTA button in nav */
.site-nav .nav-cta {
  padding: 0.6rem 1.25rem;
  background: var(--action-bg);
  color: var(--action-fg);
  border-radius: 6px;
  margin-left: 0.5rem;
}

.site-nav .nav-cta::after {
  display: none;
}

.site-nav .nav-cta:hover {
  background: var(--action-hover-bg);
  color: var(--action-hover-fg);
  transform: translateY(-1px);
  box-shadow: var(--shadow-accent);
}

/* Mobile menu toggle */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1.5px solid var(--line-strong);
  border-radius: 6px;
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  min-height: 48px;
  touch-action: manipulation;
  transition: all var(--dur) var(--ease-out);
}

.nav-toggle:hover {
  background: var(--action-bg);
  color: var(--action-fg);
  border-color: var(--action-bg);
}

/* ============================================================
   SITE FOOTER - Theme-adaptive
   ============================================================ */

.site-footer {
  background: var(--bg-subtle);
  color: var(--text-primary);
  padding-block: var(--space-6) var(--space-4);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-default);
  margin-bottom: var(--space-3);
}

.footer-name {
  font-family: var(--font-display);
  font-size: var(--step-1);
  font-weight: 700;
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

.footer-name em {
  font-style: normal;
  font-weight: 400;
  color: var(--accent);
}

.site-footer p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.site-footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--dur) var(--ease-out);
}

.site-footer a:hover {
  color: var(--accent);
}

.site-footer ul {
  list-style: none;
  display: grid;
  gap: 0.6rem;
}

.site-footer li a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 0.9rem;
}

.footer-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-2);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

/* ============================================================
   CONTACT SECTION - Theme-adaptive
   ============================================================ */

.contact {
  background: var(--bg-subtle);
  color: var(--text-primary);
}

.contact .container {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(3rem, 6vw, 5rem);
}

.contact h2 {
  font-size: var(--step-4);
  margin-bottom: var(--space-3);
  color: var(--text-primary);
}

.contact h2 em {
  color: var(--accent);
}

.contact-lede {
  max-width: 32rem;
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
}

.contact-channels {
  list-style: none;
  display: grid;
  gap: 1rem;
}

.contact-channels a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  text-decoration: none;
  font-size: 1.05rem;
  color: var(--text-primary);
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-default);
  min-height: 48px;
  transition: all var(--dur) var(--ease-out);
}

.contact-channels a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.contact-channels .label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  min-width: 5rem;
}

.contact-address {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-default);
}

.contact-address address {
  font-style: normal;
  font-size: 1.05rem;
  color: var(--text-primary);
}

/* ============================================================
   CONTACT FORM - Theme-adaptive, clean, accessible
   ============================================================ */

.contact-form {
  background: var(--bg-base);
  border: 1px solid var(--border-default);
  border-radius: 8px;
  padding: var(--space-4);
  display: grid;
  gap: var(--space-3);
}

.form-field {
  display: grid;
  gap: 0.5rem;
}

.form-field label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.form-field input,
.form-field select,
.form-field textarea {
  background: var(--bg-base);
  border: 1px solid var(--border-default);
  border-radius: 4px;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  min-height: 48px;
  transition: all var(--dur) var(--ease-out);
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--text-placeholder);
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.form-field textarea {
  min-height: 120px;
  resize: vertical;
  font-family: var(--font-body);
}

.form-field select option {
  background: var(--bg-base);
  color: var(--text-primary);
}

.form-required {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.form-hint {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.form-status {
  font-size: 0.9rem;
  color: var(--accent);
  min-height: 1.2em;
}

/* ============================================================
   FORM VALIDATION STATES - Semantic colors (Refactoring UI)
   ============================================================ */

/* Error state */
.form-field--error input,
.form-field--error select,
.form-field--error textarea {
  border-color: var(--error) !important;
  background: var(--error-light) !important;
}

.form-field--error input:focus,
.form-field--error select:focus,
.form-field--error textarea:focus {
  border-color: var(--error) !important;
  box-shadow: 0 0 0 3px var(--error-light) !important;
}

.form-error {
  font-size: 0.85rem;
  color: var(--error);
  margin-top: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Success state */
.form-field--success input,
.form-field--success select,
.form-field--success textarea {
  border-color: var(--success) !important;
  background: var(--success-light) !important;
}

.form-success {
  font-size: 0.85rem;
  color: var(--success);
  margin-top: 0.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Warning state */
.form-field--warning input,
.form-field--warning select,
.form-field--warning textarea {
  border-color: var(--warning) !important;
  background: var(--warning-light) !important;
}

.form-warning {
  font-size: 0.85rem;
  color: var(--warning);
  margin-top: 0.25rem;
}

/* Invalid input (HTML5 validation) */
input:invalid:not(:placeholder-shown):not(:focus),
select:invalid:not(:placeholder-shown):not(:focus),
textarea:invalid:not(:placeholder-shown):not(:focus) {
  border-color: var(--error-border);
}

.contact .contact-form .btn {
  border-color: var(--text-primary);
  color: var(--text-primary);
  background: transparent;
}

.contact .contact-form .btn:hover {
  background: var(--action-bg);
  color: var(--action-fg);
  border-color: var(--action-bg);
}

/* ============================================================
   MOBILE RESPONSIVE
   ============================================================ */

@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg-base);
    border-bottom: 1px solid var(--line);
    padding: var(--space-3) var(--gutter);
    max-height: calc(100dvh - var(--header-h));
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition:
      opacity var(--dur) var(--ease-out),
      transform var(--dur) var(--ease-out),
      visibility 0s linear var(--dur);
  }

  .site-nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
    transition-delay: 0s;
  }

  .site-nav a {
    padding: 1rem 0;
    font-size: 1rem;
    border-bottom: 1px solid var(--line);
  }

  .site-nav .nav-cta {
    margin-left: 0;
    margin-top: 0.5rem;
    justify-content: center;
    border-bottom: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }

  .contact .container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .wordmark {
    font-size: 1rem;
  }

  .contact-channels a {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.3rem;
  }

  .contact-form {
    padding: var(--space-3);
  }
}

/* ============================================================
   DARK MODE - Semantic tokens auto-swap; these are hardcoded
   fallbacks for resilience and fine-tuned overrides.
   ============================================================ */

@media (prefers-color-scheme: dark) {
  .site-footer,
  .contact {
    background: #1e293b; /* grey-800 fallback for --bg-subtle */
  }

  .contact-form {
    background: #334155; /* grey-700 — elevated above section */
    background: var(--bg-muted, #334155);
  }
}