/* ============================================================
   Active nav state
   ============================================================ */
.nav-link[aria-current="page"] {
  color: var(--color-text);
}

.nav-link[aria-current="page"]::after {
  width: 100%;
}

/* ============================================================
   Form fields
   ============================================================ */
.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.form-field label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: 0.01em;
}

.form-field input,
.form-field textarea {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text);
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  padding: 0.75rem 0.875rem;
  width: 100%;
  transition: border-color 0.15s;
  -webkit-appearance: none;
  appearance: none;
}

.form-field textarea {
  resize: vertical;
  min-height: 10rem;
  line-height: 1.65;
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--color-text);
}

.form-field input[aria-invalid="true"],
.form-field textarea[aria-invalid="true"] {
  border-color: #b91c1c;
}

.field-hint {
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.field-error {
  font-size: 0.8125rem;
  color: #b91c1c;
  line-height: 1.5;
}

.form-status {
  margin-top: 1.5rem;
  font-size: 0.9375rem;
  line-height: 1.65;
  padding: 1rem 1.125rem;
  border-radius: 2px;
  display: none;
}

.form-status.is-success {
  display: block;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.form-status.is-error {
  display: block;
  background-color: #fef2f2;
  border: 1px solid #fecaca;
  color: #b91c1c;
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  padding: 0.7rem 1.5rem;
  border-radius: 2px;
  letter-spacing: 0.01em;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-text);
  color: var(--color-bg);
  border: 1.5px solid var(--color-text);
}

.btn-primary:hover {
  background-color: #333333;
  border-color: #333333;
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-text);
}

.btn-secondary:hover {
  background-color: var(--color-text);
  color: var(--color-bg);
}

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--color-text);
  line-height: 1;
  transition: opacity 0.15s;
}

.brand-lockup:hover {
  opacity: 0.7;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.35rem;
  height: 1.35rem;
  background-color: var(--color-text);
  border-radius: 2px;
  font-family: var(--font-sans);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--color-bg);
}

.brand-text {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0;
  color: var(--color-text);
}

.nav-list {
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--color-text-muted);
  position: relative;
  padding-bottom: 2px;
  transition: color 0.15s;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-text);
  transition: width 0.2s ease;
}

.nav-link:hover {
  color: var(--color-text);
}

.nav-link:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px 4px;
  width: 32px;
  height: 32px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background-color: var(--color-text);
  transition: transform 0.2s ease, opacity 0.2s ease;
  transform-origin: center;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background-color: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding-block: 2.5rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 1.5rem;
}

.footer-brand {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text);
}

.footer-nav {
  display: flex;
  gap: 2rem;
}

.footer-nav a {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  transition: color 0.15s;
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.footer-social {
  display: flex;
  gap: 1.75rem;
}

.footer-social a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: color 0.15s;
}

.footer-social a:hover {
  color: var(--color-text);
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ============================================================
   Responsive — navigation & footer
   ============================================================ */
@media (max-width: 768px) {
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem var(--container-px) 2rem;
  }

  .nav.is-open {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    gap: 1.25rem;
    align-items: flex-start;
  }

  .nav-link {
    font-size: 1.0625rem;
    color: var(--color-text);
  }

  .nav-toggle {
    display: flex;
  }

  .footer-top {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.25rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}

@media (max-width: 480px) {
  .brand-lockup {
    gap: 0.45rem;
  }

  .brand-mark {
    width: 1.25rem;
    height: 1.25rem;
    font-size: 0.58rem;
  }

  .brand-text {
    font-size: 0.9375rem;
  }

  .btn {
    text-align: center;
  }
}