/* =============================================================
   SPRUCE PROJECT — Components
   Nav, buttons, forms, backdrop, page intro, page header, footer
   ============================================================= */

/* --- Navigation --- */
.nav__inner {
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-text);
  flex-shrink: 0;
}

.nav__logo-img {
  height: 28px;
  width: auto;
  flex-shrink: 0;
}

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

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--color-neutral);
  position: relative;
  transition: color var(--duration-fast) var(--ease-out);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--duration-base) var(--ease-out);
}

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

.nav__link:hover::after,
.nav__link.active::after {
  transform: scaleX(1);
}

.nav__link.active {
  color: var(--color-accent);
}

.nav__toggle {
  font-size: var(--text-xs);
  font-weight: var(--weight-semi);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-muted);
  cursor: pointer;
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition:
    color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out);
}

.nav__toggle:hover {
  color: var(--color-text);
  border-color: var(--color-accent);
}

@media (max-width: 480px) {
  .nav__logo {
    font-size: var(--text-sm);
  }
  .nav__logo-img {
    height: 20px;
  }
  .nav__links {
    gap: var(--space-md);
  }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  font-weight: var(--weight-semi);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition:
    background-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out);
  cursor: pointer;
}

.btn-primary {
  background-color: var(--color-accent);
  color: var(--color-bg);
  border: 1px solid var(--color-accent);
}

.btn-primary:hover {
  background-color: var(--color-text);
  border-color: var(--color-text);
}

/* --- Forms --- */
.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

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

.field label {
  font-size: var(--text-sm);
  font-weight: var(--weight-semi);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-neutral);
}

.field input,
.field textarea {
  background-color: transparent;
  border: 0;
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--space-md);
  font-size: var(--text-base);
  color: var(--color-text);
  transition:
    border-color var(--duration-fast) var(--ease-out);
}

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

.field textarea {
  resize: vertical;
  min-height: 140px;
}

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

/* --- Alerts --- */
.alert {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
}

.alert--success {
  background-color: rgba(98, 146, 158, 0.15);
  border: 1px solid rgba(98, 146, 158, 0.4);
  color: var(--color-accent);
}

.alert--error {
  background-color: rgba(220, 100, 80, 0.15);
  border: 1px solid rgba(220, 100, 80, 0.4);
  color: #e07060;
}

/* --- Backdrop ---
   The mountain photo as wallpaper: darkened, desaturated and fading
   into the page colour, so it sets a mood without acting as a hero.
   It sits behind the nav too, so it's anchored to <body> (see
   layout.css). Place <div class="backdrop" aria-hidden="true"> as
   the first thing in the page.
   ============================================================= */
.backdrop {
  position: absolute;
  inset: 0 0 auto;
  height: calc(var(--vph) * 0.9);
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.backdrop::before,
.backdrop::after {
  content: '';
  position: absolute;
  inset: 0;
}

.backdrop::before {
  background: url('/assets/images/mountains.jpg') 50% 40% / cover no-repeat;
  filter: saturate(0.5);
}

.backdrop::after {
  background: linear-gradient(
    to bottom,
    color-mix(in srgb, var(--color-bg) 70%, transparent) 0%,
    color-mix(in srgb, var(--color-bg) 82%, transparent) 50%,
    var(--color-bg) 100%
  );
}

/* --- Page intro ---
   Large two-tone headline over the backdrop (home, contact).
   ============================================================= */
.page-intro {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: calc(var(--vph) * 0.4 - var(--nav-height));
  padding-block: var(--space-xl) var(--space-lg);
}

.page-intro__eyebrow {
  font-size: var(--text-sm);
  color: var(--color-neutral);
  margin-bottom: var(--space-md);
}

.page-intro__title {
  font-size: var(--text-display);
  text-wrap: balance;
}

.page-intro__title-sub {
  display: block;
  color: var(--color-muted);
}

/* Japanese needs more leading and should break at phrase boundaries */
html[data-lang="jp"] .page-intro__title {
  line-height: var(--leading-snug);
  letter-spacing: 0;
  word-break: auto-phrase;
}

.page-intro__lead {
  color: var(--color-neutral);
  max-width: 48ch;
  margin-top: var(--space-lg);
}

.page-intro + .section {
  padding-top: var(--space-lg);
}

/* --- Page header ---
   Title block at the top of inner pages (contact, privacy).
   ============================================================= */
.page-header {
  padding-top: var(--space-xl);
  padding-bottom: var(--space-lg);
}

.page-header__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-sm);
}

.page-header__sub {
  color: var(--color-neutral);
  max-width: 48ch;
}

.page-header + .section {
  padding-top: var(--space-lg);
}

/* --- Section labels --- */
.section-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-semi);
  letter-spacing: var(--tracking-wide);
  line-height: var(--leading-normal);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

/* --- Inline text link --- */
.text-link {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 3px;
  transition: color var(--duration-fast) var(--ease-out);
}

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

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-md);
  white-space: nowrap;
  padding-block: var(--space-lg);
  font-size: var(--text-sm);
  color: var(--color-muted);
}

.footer__nav {
  display: flex;
  gap: var(--space-lg);
}