/* Reusable components: header, footer, buttons, cards, badges, form fields.
   Page-specific layout lives in pages.css. */

/* =========================================================================
   Site header: a sticky bar with the wordmark, a Services dropdown (the
   five services), About, Contact, the language switch and "Get in touch".
   The current page gets a 2px accent rule under its link. Below 61.25em a
   hamburger opens a full-height panel. nav.js runs the dropdown and the
   panel; effects.js adds .is-scrolled once the page has scrolled.
   ========================================================================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: var(--c-bg);
  border-bottom: 1px solid transparent;
  transition: background-color var(--dur) var(--ease-faq),
              border-color var(--dur) var(--ease-faq),
              box-shadow var(--dur) var(--ease-faq);
}

.site-header.is-scrolled {
  background-color: var(--c-bg-deep);
  border-bottom-color: var(--c-border-soft);
  box-shadow: 0 8px 24px -12px rgba(0, 0, 0, 0.6);
}

.site-header ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header li + li {
  margin-top: 0;
}

.site-header :where(a) {          /* low specificity: component colours win */
  color: inherit;
  text-decoration: none;
}

.site-header :is(a, button):focus-visible {
  outline: var(--focus-width) solid var(--c-accent-text);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.site-header__in {
  display: flex;
  align-items: center;
  gap: var(--nav-gap);
  height: var(--header-height-m);
}

.site-header__mark {
  display: inline-flex;
  align-items: center;
  color: var(--c-text);
}

/* The ALTEA lockup (lighthouse and the name with the warm wash) in the
   header and footer: lockup-dark.svg as an image, its colours fixed in the
   file. Source files: assets/img/brand/. */
.brand-lockup {
  display: block;
  width: auto;
  height: var(--logo-h-header);
}

/* ---- desktop nav ---- */
.site-nav {
  display: none;
  margin-left: auto;
}

.site-nav > ul {
  display: flex;
  align-items: center;
  gap: var(--nav-gap);
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: var(--header-height);
  padding: 0;
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  line-height: 1;
  color: var(--c-text-muted);
  background: none;
  border: 0;
  cursor: pointer;
  transition: color var(--dur) var(--ease-faq);
}

.site-nav__link:hover,
.site-nav__link[aria-current="page"],
.site-nav__link[data-current="page"],
.site-nav__link[aria-expanded="true"] {
  color: var(--c-text);
}

.site-nav__link[aria-current="page"],
.site-nav__link[data-current="page"] {
  box-shadow: inset 0 -2px 0 var(--c-accent);
}

/* nav.js swaps the plain Services link for the dropdown button */
.site-nav__link[hidden] {
  display: none;
}

/* the focus ring goes round the text, not the full-height link */
.site-header .site-nav__link:focus-visible { outline: none; }

.site-nav__link:focus-visible > .site-nav__t {
  outline: var(--focus-width) solid var(--c-accent-text);
  outline-offset: 5px;
  border-radius: var(--radius-sm);
}

.site-nav__chev {
  width: 12px;
  height: 12px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  transition: transform var(--dur) var(--ease-faq);
}

.site-nav__link[aria-expanded="true"] .site-nav__chev {
  transform: rotate(180deg);
}

/* Services dropdown */
.site-nav__dd {
  position: relative;
}

.site-nav__panel {
  position: absolute;
  top: calc(100% + 1px);
  left: -20px;
  width: var(--nav-dd-w);
  padding: var(--space-2);
  background-color: var(--c-bg);
  border: 1px solid var(--c-border);
  box-shadow: inset 0 var(--tested-marker) 0 var(--c-accent),
              0 20px 40px -16px rgba(0, 0, 0, 0.7);
}

.site-nav__panel[hidden] {
  display: none;
}

.site-nav__panel a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 10px var(--space-3);
  font-size: var(--fs-sm);
  line-height: 1.3;
  color: var(--c-text);
  border-radius: var(--radius-sm);
  transition: background-color var(--dur) var(--ease-faq);
}

.site-nav__panel a:hover,
.site-nav__panel a:focus-visible,
.site-nav__panel a[aria-current="page"] {
  background-color: var(--c-surface);
}

.site-nav__panel a:hover .site-nav__ico,
.site-nav__panel a[aria-current="page"] .site-nav__ico {
  color: var(--c-accent-text);
}

.site-nav__panel a.site-nav__all {
  justify-content: space-between;
  margin-bottom: var(--space-1);
  font-weight: var(--fw-semibold);
  border-bottom: 1px solid var(--c-border-soft);
  border-radius: 0;
}

.site-nav__all span:last-child {
  color: var(--c-accent-text);
}

.site-nav__ico {
  flex: none;
  width: var(--fit-icon-sm);
  height: var(--fit-icon-sm);
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  color: var(--c-text-muted);
  transition: color var(--dur) var(--ease-faq);
}

/* ---- language switch and button ---- */
.site-header__act {
  display: none;
  align-items: center;
  gap: 22px;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-nav-lang);
  line-height: 1;
  color: var(--c-text-muted);
}

.lang-switch a {
  padding: var(--space-1) 2px;
  color: var(--c-text-muted);
  transition: color var(--dur);
}

.lang-switch a:hover,
.lang-switch a[aria-current] {
  color: var(--c-text);
}

.lang-switch__sep {
  color: var(--c-border);
}

.site-header__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: var(--nav-btn-h);
  padding: 0 var(--space-4);
  font-family: var(--font-body);
  font-size: var(--fs-nav-btn);
  font-weight: var(--fw-semibold);
  line-height: 1;
  white-space: nowrap;
  color: var(--c-on-accent);
  background-color: var(--c-accent);
  border-radius: var(--radius);
  transition: background-color var(--dur) var(--ease-faq);
}

.site-header .site-header__btn { color: var(--c-on-accent); }
.site-header__btn:hover { background-color: var(--c-accent-strong); }

/* phones: a compact Contact button beside the menu */
.site-header__btn--m {
  height: var(--nav-btn-h);
  margin-left: auto;
  padding: 0 var(--space-3);
  font-size: var(--fs-xs);
}

.site-header__btn--m + .menu-toggle {
  margin-left: var(--space-2);
}

/* ---- hamburger ---- */
.menu-toggle {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-left: auto;
  margin-right: -10px;
  padding: 0;
  color: var(--c-text);
  background: none;
  border: 0;
  cursor: pointer;
}

.menu-toggle__bars {
  position: relative;
  width: 20px;
  height: 12px;
}

.menu-toggle__bars::before,
.menu-toggle__bars::after {
  content: "";
  position: absolute;
  right: 0;
  left: 0;
  height: 1.5px;
  background-color: currentColor;
  transition: transform var(--dur) var(--ease-faq), top var(--dur) var(--ease-faq);
}

.menu-toggle__bars::before { top: 2px; }
.menu-toggle__bars::after { top: 9px; }

.menu-toggle[aria-expanded="true"] .menu-toggle__bars::before {
  top: 5.5px;
  transform: rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle__bars::after {
  top: 5.5px;
  transform: rotate(-45deg);
}

/* ---- phone menu: a full-height panel under the bar ---- */
.mobile-nav {
  position: fixed;
  top: var(--header-height-m);
  right: 0;
  bottom: 0;
  left: 0;
  z-index: var(--z-menu);
  display: flex;
  flex-direction: column;
  overflow: auto;
  padding: var(--space-2) var(--gutter) var(--space-5);
  background-color: var(--c-bg-deep);
  border-top: 1px solid var(--c-border-soft);
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.mobile-nav li + li {
  margin-top: 0;
}

.mobile-nav a {
  text-decoration: none;
}

.mobile-nav__list > li {
  border-bottom: 1px solid var(--c-border-soft);
}

.mobile-nav__link {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--mnav-row);
  font-family: var(--font-body);
  font-size: var(--fs-mnav);
  font-weight: var(--fw-medium);
  line-height: 1;
  color: var(--c-text);
}

.mobile-nav__link::after {
  content: "\2192";
  font-family: var(--font-mono);
  font-size: 1.125rem;
  color: var(--c-text-muted);
  transition: transform var(--dur), color var(--dur);
}

.mobile-nav__link:hover::after {
  color: var(--c-accent-text);
  transform: translateX(4px);
}

.mobile-nav__link[aria-current="page"] {
  padding-left: 14px;
}

.mobile-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  top: 18px;
  bottom: 18px;
  left: 0;
  width: 3px;
  background-color: var(--c-accent);
}

.mobile-nav__sub {
  display: grid;
  gap: 2px;
  padding: 0 0 14px 2px;
}

.mobile-nav__sub a {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 44px;
  padding: 6px 0;
  font-size: var(--fs-body);
  line-height: 1.3;
  color: var(--c-text-muted);
}

.mobile-nav__sub a:hover,
.mobile-nav__sub a[aria-current="page"] {
  color: var(--c-text);
}

.mobile-nav__sub a[aria-current="page"] .site-nav__ico {
  color: var(--c-accent-text);
}

.mobile-nav__foot {
  display: grid;
  gap: 18px;
  margin-top: auto;
  padding-top: var(--space-5);
}

.mobile-nav__foot .lang-switch {
  justify-self: start;
  font-size: var(--fs-xs);
}

.mobile-nav .site-header__btn {
  color: var(--c-on-accent);
  height: var(--mnav-btn-h);
  font-size: var(--fs-body);
}

@media (min-width: 61.25em) {
  .site-header__in { height: var(--header-height); }
  .site-nav { display: block; }
  .site-header__act { display: flex; }
  .menu-toggle,
  .mobile-nav,
  .site-header__btn--m { display: none !important; }
}

@media (prefers-reduced-motion: reduce) {
  .site-header *,
  .site-header *::before,
  .site-header *::after,
  .mobile-nav * {
    transition: none !important;
  }
}

/* =========================================================================
   Buttons
   ========================================================================= */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.875rem 1.625rem;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.btn--primary {
  background-color: var(--c-accent);
  color: var(--c-on-accent);
}

.btn--primary:hover {
  background-color: var(--c-accent-strong);
  color: var(--c-on-accent);
}

.btn--ghost {
  background-color: transparent;
  color: var(--c-text);
  border: 1px solid var(--c-border);
}

.btn--ghost:hover {
  border-color: var(--c-text);
  color: var(--c-text);
}

.btn--lg {
  padding: 1rem 2.125rem;
  font-size: var(--fs-body);
}

.btn--on-dark-muted {
  color: var(--c-text-muted);
}

/* Thin red divider line, used to separate sections or set off a statement */
.divider {
  width: 48px;
  height: 2px;
  background-color: var(--c-accent);
  border: none;
  margin-block: var(--space-5);
}

/* =========================================================================
   Cards
   ========================================================================= */

.card {
  display: flex;
  flex-direction: column;
  background-color: var(--c-surface);
  border: 1px solid var(--c-border-soft);
  border-radius: var(--radius-lg);
  padding: clamp(1.625rem, 1.2rem + 1.4vw, 2.125rem);
  box-shadow: var(--shadow-card);
  transition: border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

a.card {
  min-height: 14.5rem;
  text-decoration: none;
  color: inherit;
}

a.card:hover {
  border-color: var(--c-accent-line);
  box-shadow: var(--shadow-raised);
  transform: translateY(-4px);
  animation: glitch-text 1.1s steps(1) 1 both;
}

/* Service number: plain mono text, not a box. */
.card__icon {
  margin-bottom: var(--space-4);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--c-accent-text);
}

.card__meta {
  margin-bottom: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: var(--ls-caps);
  text-transform: uppercase;
  color: var(--c-text-muted); /* --c-text-dim is too faint for 12px text */
}

.card__title {
  font-size: var(--fs-card);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-3);
}

.card__text {
  flex: 1;
  font-size: var(--fs-sm);
  margin-bottom: 0;
}

/* Sits at the bottom of the card, so links in a row of cards line up even
   when their titles wrap to a different number of lines. */
.card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--c-text);
}

a.card:hover .card__link {
  color: var(--c-accent-text);
}

/* =========================================================================
   Grids
   ========================================================================= */

.grid {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 40em) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 56em) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* =========================================================================
   Site footer: one row, the brand on the left and the privacy link with the
   legal line on the right. Hover: accent text with an accent underline.
   ========================================================================= */

.site-footer {
  container-type: inline-size;
  background-color: var(--c-bg-deep);
  border-top: 1px solid var(--c-border-soft);
}

.site-footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer li + li {
  margin-top: 0;
}

.site-footer a {
  color: var(--c-text);
  text-decoration: underline;
  text-decoration-color: transparent;
  text-decoration-thickness: 1px;
  text-underline-offset: var(--footer-link-offset);
  transition: color var(--dur-fast) ease, text-decoration-color var(--dur-fast) ease;
}

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

.site-footer a:focus-visible {
  outline: var(--focus-width) solid var(--c-accent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.site-footer__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4) var(--space-6);
  padding-block: var(--space-7);
}

.site-footer__mark {
  display: inline-flex;
  align-items: center;
  justify-self: start;
}

.site-footer__mark .brand-lockup {
  height: var(--logo-h-footer);
}

.site-footer a.site-footer__mark {
  color: var(--c-text);
  text-decoration: none;
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  line-height: 1.7;
  color: var(--c-text-muted);
}

.site-footer__legal a { color: var(--c-text-muted); }

/* footer links: a 44px tap height without changing the layout */
.site-footer__legal a,
.site-footer a.site-footer__mark {
  padding-block: var(--space-3);
  margin-block: calc(-1 * var(--space-3));
}

.site-footer__legal a { display: inline-block; }

.site-footer__legal a:hover { color: var(--c-accent-text); }

@media (prefers-reduced-motion: reduce) {
  .site-footer a { transition: none; }
}

/* =========================================================================
   Glitch hover effects. The card version is a short RGB-split on the text;
   the heading version (.glitch-hover) loops while the pointer is over it.
   prefers-reduced-motion collapses both to a single frame in base.css.
   ========================================================================= */

@keyframes glitch-text {
  0%, 100% { text-shadow: none; }
  20% { text-shadow: -1.5px 0 var(--c-accent-text), 1.5px 0 var(--c-glitch); }
  40% { text-shadow: 1.5px 0 var(--c-accent-text), -1.5px 0 var(--c-glitch); }
  60% { text-shadow: -1px 0 var(--c-accent-text), 1px 0 var(--c-glitch); }
  80% { text-shadow: none; }
}

@keyframes glitch-heading {
  0%, 88%, 100% { text-shadow: none; transform: translate(0); }
  89% { text-shadow: -2px 0 var(--c-accent-text), 2px 0 var(--c-glitch); transform: translate(1px, -1px); }
  90% { text-shadow: 2px 0 var(--c-accent-text), -2px 0 var(--c-glitch); transform: translate(-2px, 1px); }
  91% { text-shadow: -1px 0 var(--c-accent-text), 1px 0 var(--c-glitch); clip-path: inset(20% 0 55% 0); transform: translate(1px, 0); }
  92% { text-shadow: 2px 0 var(--c-accent-text), -1px 0 var(--c-glitch); clip-path: inset(60% 0 10% 0); transform: translate(-1px, 0); }
  93% { text-shadow: none; clip-path: inset(0 0 0 0); transform: translate(0); }
  94% { text-shadow: -2px 0 var(--c-accent-text), 1px 0 var(--c-glitch); transform: translate(2px, 1px); }
  95% { text-shadow: none; transform: translate(0); }
}

.glitch-hover {
  cursor: default;
}

.glitch-hover:hover {
  animation: glitch-heading 0.7s steps(1) infinite;
}

/* =========================================================================
   Form fields and the contact form. The form posts to /api/contact (see
   worker/index.js); assets/js/contact-form.js submits it without a reload.
   ========================================================================= */

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.field__label {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text);
}

.field__optional {
  text-transform: none;
  letter-spacing: 0;
  color: var(--c-text-muted);
}

.field__input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--c-field-border);
  border-radius: var(--radius);
  background-color: var(--c-surface);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.5;
  transition: border-color var(--dur) var(--ease);
}

.field__input:hover {
  border-color: var(--c-text-muted);
}

/* 2px accent edge on focus, without shifting the layout. It replaces the
   site-wide white focus outline (base.css), which browsers also show on a
   mouse click in a text field. The lighter accent keeps the edge above 3:1
   against the field. */
.field__input:focus-visible {
  outline: none;
  border-color: var(--c-accent-text);
  border-radius: var(--radius);
  box-shadow: 0 0 0 1px var(--c-accent-text);
}

/* Example text in the message field. Browsers default to a faint grey;
   this keeps it readable (about 4.5:1 on the field) and full opacity. */
.field__input::placeholder {
  color: var(--c-text-dim);
  opacity: 1;
}

.field__input--area {
  min-height: 9rem;
  resize: vertical;
}

.field__hint {
  font-size: var(--fs-xs);
  color: var(--c-text-muted);
}

.contact-form__row {
  display: grid;
  gap: 0 var(--space-5);
}

@media (min-width: 40em) {
  .contact-form__row {
    grid-template-columns: 1fr 1fr;
  }
}

/* Off-screen rather than display:none, so naive bots still fill it in. */
.contact-form__trap {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.contact-form__actions {
  margin-top: var(--space-2);
}

.contact-form__privacy {
  margin-top: var(--space-3);
  font-size: var(--fs-xs);
  line-height: 1.5;
  color: var(--c-text-muted);
}

.contact-form__privacy a {
  color: var(--c-text-muted);
}

.contact-form__privacy a:hover {
  color: var(--c-accent-text);
}

.contact-form__actions .btn[disabled] {
  opacity: 0.6;
  cursor: progress;
}

.contact-form__status {
  min-height: 1.5em;
  margin-top: var(--space-4);
  font-size: var(--fs-sm);
  color: var(--c-text);
}

.contact-form__status[data-state="error"] {
  color: var(--c-accent-text);
}

/* =========================================================================
   Intro grid: the faint squares behind the first band of every page,
   fading out towards the bottom. The band's content needs
   position: relative to sit above it.
   ========================================================================= */

.intro-grid {
  position: relative;
  overflow: hidden;
}

.intro-grid::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--c-border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-border-soft) 1px, transparent 1px);
  background-size: var(--intro-grid-cell) var(--intro-grid-cell);
  -webkit-mask-image: linear-gradient(180deg, #000, transparent 90%);
          mask-image: linear-gradient(180deg, #000, transparent 90%);
  pointer-events: none;
}