/* ==========================================================================
   Eura Digital — components.css
   Reusable components: buttons, links, navigation, language switcher,
   service rows, project features, process steps, FAQ, forms, motion.
   ========================================================================== */

/* ---------- Buttons ---------- */
.btn {
  --btn-bg: var(--ink);
  --btn-fg: #fff;
  --btn-bd: var(--ink);
  position: relative;
  display: inline-flex; align-items: center; justify-content: center; gap: 0.75rem;
  min-height: 3.25rem; padding: 0 1.5rem;
  font-size: 1rem; font-weight: 500; line-height: 1; letter-spacing: 0;
  text-decoration: none; white-space: nowrap;
  color: var(--btn-fg); background: var(--btn-bg);
  border: 1.5px solid var(--btn-bd); border-radius: var(--r-sm);
  transition: background var(--t-mid) var(--ease), color var(--t-mid) var(--ease),
    border-color var(--t-mid) var(--ease);
}
.btn:hover { --btn-bg: var(--ink-2); --btn-bd: var(--ink-2); }
.btn__dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--orange); flex: none;
}
.btn__arrow { width: 1rem; height: 1rem; flex: none; transition: transform var(--t-mid) var(--ease); }
.btn:hover .btn__arrow { transform: translate(3px, -2px); } /* moves along the Eura angle */

.btn--ghost { --btn-bg: transparent; --btn-fg: var(--ink); --btn-bd: var(--line-strong); }
.btn--ghost:hover { --btn-bg: transparent; --btn-bd: var(--ink); }

.btn--light { --btn-bg: #fff; --btn-fg: var(--ink); --btn-bd: #fff; }
.btn--light:hover { --btn-bg: #e9f4ff; --btn-bd: #e9f4ff; }
.btn--ghost-light { --btn-bg: transparent; --btn-fg: #fff; --btn-bd: rgba(255,255,255,.3); }
.btn--ghost-light:hover { --btn-bg: transparent; --btn-bd: #fff; }

.btn--sm { min-height: 2.75rem; padding: 0 1.125rem; font-size: 0.9375rem; }
.btn[disabled], .btn[aria-busy="true"] { opacity: .6; pointer-events: none; }

/* ---------- Text link ---------- */
.link-arrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-weight: 500; color: var(--blue); text-decoration: none;
  background: linear-gradient(currentColor, currentColor) 0 100% / 0 1.5px no-repeat;
  padding-bottom: 2px;
  transition: background-size var(--t-mid) var(--ease);
}
.link-arrow:hover { background-size: 100% 1.5px; }
.link-arrow svg { width: 0.95em; height: 0.95em; transition: transform var(--t-mid) var(--ease); }
.link-arrow:hover svg { transform: translate(2px, -2px); }
.is-dark .link-arrow { color: var(--cyan); }

/* ---------- Primary navigation (desktop) ---------- */
.nav { display: none; }
.nav__list { display: flex; align-items: center; gap: 0.25rem; }
.nav__link {
  display: inline-flex; align-items: center; gap: 0.35rem;
  padding: 0.625rem 0.875rem; border-radius: var(--r-sm);
  font-size: 0.9688rem; font-weight: 500; color: var(--ink); text-decoration: none;
  background: none; border: 0;
  transition: background var(--t-fast) var(--ease);
}
.nav__link:hover, .nav__link[aria-expanded="true"] { background: rgba(1, 19, 55, 0.05); }
.nav__link svg { width: 0.75rem; height: 0.75rem; transition: transform var(--t-mid) var(--ease); }
.nav__link[aria-expanded="true"] svg { transform: rotate(180deg); }
.nav__item { position: relative; }

/* Mega menu: three columns = three bars of the E */
.mega {
  position: absolute; top: calc(100% + 0.75rem); left: 50%;
  width: min(54rem, calc(100vw - 4rem));
  transform: translate(-42%, 6px);
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r-md);
  box-shadow: var(--shadow-pop);
  padding: var(--s-6);
  display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-6);
  opacity: 0; visibility: hidden;
  transition: opacity var(--t-mid) var(--ease), transform var(--t-mid) var(--ease), visibility 0s linear var(--t-mid);
}
.mega.is-open {
  opacity: 1; visibility: visible; transform: translate(-42%, 0);
  transition: opacity var(--t-mid) var(--ease), transform var(--t-mid) var(--ease), visibility 0s;
}
.mega__group { display: grid; gap: var(--s-3); align-content: start; }
.mega__title {
  display: flex; align-items: center; gap: 0.6rem;
  font-size: var(--fs-eyebrow); font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--slate);
  padding-bottom: var(--s-3); border-bottom: 1px solid var(--line);
}
.mega__title::before {
  content: ""; width: 1.5rem; height: 0.5rem; border-radius: 2px; transform: skewX(var(--skew)); background: var(--grad-brand);
}
.mega__link { display: grid; gap: 2px; padding: 0.5rem 0.625rem; margin-inline: -0.625rem; border-radius: var(--r-sm); text-decoration: none; }
.mega__link strong { font-weight: 500; font-size: 0.9688rem; }
.mega__link span { font-size: 0.8438rem; color: var(--muted); line-height: 1.4; }
.mega__link:hover { background: var(--canvas); }
.mega__link:hover strong { color: var(--blue); }

/* ---------- Language switcher ---------- */
.lang {
  display: inline-flex; align-items: center;
  padding: 3px; border: 1px solid var(--line-strong); border-radius: 999px;
  font-size: 0.8125rem; font-weight: 500; letter-spacing: 0.06em;
}
.lang a {
  position: relative;
  display: inline-flex; align-items: center; gap: 0.35rem;
  min-height: 2rem; padding: 0 0.7rem; border-radius: 999px;
  text-decoration: none; color: var(--muted);
}
.lang a:hover { color: var(--ink); }
.lang a[aria-current="true"] { color: var(--ink); background: var(--surface); box-shadow: 0 1px 2px rgba(1,19,55,.08); }
.lang a[aria-current="true"]::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--blue-electric);
}
.is-dark .lang, .lang--dark { border-color: var(--line-dark); }
.lang--dark a { color: var(--on-ink-muted); }
.lang--dark a:hover { color: #fff; }
.lang--dark a[aria-current="true"] { color: #fff; background: var(--ink-3); box-shadow: none; }

/* ---------- Header actions ---------- */
.header-actions { display: flex; align-items: center; gap: var(--s-3); }
.header-actions .btn { display: none; }

/* ---------- Mobile menu ---------- */
.menu-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 2.75rem; height: 2.75rem; border-radius: var(--r-sm);
  border: 1px solid var(--line-strong); background: var(--surface);
}
.menu-toggle__bars { position: relative; width: 1.125rem; height: 0.75rem; }
.menu-toggle__bars i {
  position: absolute; left: 0; height: 1.5px; width: 100%; background: var(--ink); border-radius: 1px;
  transition: transform var(--t-mid) var(--ease), opacity var(--t-fast);
}
.menu-toggle__bars i:nth-child(1) { top: 0; }
.menu-toggle__bars i:nth-child(2) { top: calc(50% - 0.75px); width: 75%; }
.menu-toggle__bars i:nth-child(3) { bottom: 0; width: 50%; }
.menu-toggle[aria-expanded="true"] i:nth-child(1) { transform: translateY(5.25px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] i:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] i:nth-child(3) { width: 100%; transform: translateY(-5.25px) rotate(-45deg); }

.mobile-menu {
  position: fixed; inset: var(--header-h) 0 0 0; z-index: 90;
  background: var(--canvas);
  overflow-y: auto; overscroll-behavior: contain;
  padding: var(--s-5) var(--gutter) var(--s-7);
  display: flex; flex-direction: column; gap: var(--s-6);
  opacity: 0; visibility: hidden; transform: translateY(-8px);
  transition: opacity var(--t-mid) var(--ease), transform var(--t-mid) var(--ease), visibility 0s linear var(--t-mid);
}
.mobile-menu.is-open {
  opacity: 1; visibility: visible; transform: none;
  transition: opacity var(--t-mid) var(--ease), transform var(--t-mid) var(--ease), visibility 0s;
}
.mobile-menu__list { display: grid; }
.mobile-menu__list > li { border-bottom: 1px solid var(--line); }
.mobile-menu__link {
  display: flex; align-items: center; justify-content: space-between; width: 100%;
  min-height: 3.5rem; font-size: 1.375rem; font-weight: 500; letter-spacing: -0.01em;
  text-decoration: none; background: none; border: 0; padding: 0; text-align: left; color: var(--ink);
}
.mobile-menu__link svg { width: 1rem; height: 1rem; transition: transform var(--t-mid) var(--ease); }
.mobile-menu__link[aria-expanded="true"] svg { transform: rotate(180deg); }
.mobile-menu__sub { display: grid; gap: var(--s-1); padding: 0 0 var(--s-4); }
.mobile-menu__sub[hidden] { display: none; }
.mobile-menu__sub a { display: flex; align-items: center; min-height: 2.75rem; color: var(--slate); text-decoration: none; }
.mobile-menu__sub-title { font-size: var(--fs-eyebrow); letter-spacing: .14em; text-transform: uppercase; color: var(--muted); padding-top: var(--s-3); }
.mobile-menu__foot { display: grid; gap: var(--s-4); margin-top: auto; }
.mobile-menu__foot .btn { width: 100%; }
body.menu-open { overflow: hidden; }

/* ---------- Service row ---------- */
.service {
  position: relative;
  display: grid; grid-template-columns: 2rem 1fr; gap: var(--s-2) var(--s-4);
  padding-block: var(--s-5);
  border-bottom: 1px solid var(--line-strong);
  text-decoration: none;
}
.service__num { font-size: 0.875rem; font-weight: 500; color: var(--blue); font-variant-numeric: tabular-nums; padding-top: 0.35rem; }
.service__body { display: grid; gap: var(--s-2); min-width: 0; }
.service__name { font-size: clamp(1.25rem, 1.1rem + 0.6vw, 1.625rem); letter-spacing: -0.02em; line-height: 1.15; }
.service__desc { color: var(--slate); max-width: 36rem; }
.service__tags { display: flex; flex-wrap: wrap; gap: 0.375rem; margin-top: var(--s-2); }
.service__tags li {
  font-size: 0.8125rem; color: var(--slate); padding: 0.25rem 0.625rem;
  border: 1px solid var(--line-strong); border-radius: 4px; background: var(--surface);
}
.service__arrow {
  display: none;
  align-self: start; margin-top: 0.25rem;
  width: 2.5rem; height: 2.5rem; border-radius: 50%; place-items: center;
  border: 1px solid var(--line-strong); color: var(--ink);
  transition: background var(--t-mid) var(--ease), color var(--t-mid) var(--ease), border-color var(--t-mid) var(--ease), transform var(--t-mid) var(--ease);
}
.service__arrow svg { width: 1rem; height: 1rem; }
.service::before {
  content: ""; position: absolute; left: 0; bottom: -1px; height: 1.5px; width: 0; background: var(--grad-brand);
  transition: width var(--t-slow) var(--ease);
}
.service:hover::before, .service:focus-within::before { width: 100%; }
.service:hover .service__arrow { background: var(--ink); color: #fff; border-color: var(--ink); transform: translate(2px, -2px); }
.service:hover .service__name { color: var(--blue); }
.service__name a { text-decoration: none; }
.service__name a::after { content: ""; position: absolute; inset: 0; } /* full-row link */

/* ---------- Project feature ---------- */
.project { display: grid; gap: var(--s-5); }
.project__media {
  position: relative; overflow: hidden; border-radius: var(--r-md);
  background: var(--ink-3);
  aspect-ratio: 16 / 10;
}
.project__media img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 900ms var(--ease);
}
.project:hover .project__media img { transform: scale(1.03); }
.project__media::after { /* slanted edge accent */
  content: ""; position: absolute; right: 0; bottom: 0; width: 22%; height: 0.5rem;
  background: var(--grad-brand);
  clip-path: polygon(calc(0.5rem * var(--slant)) 0, 100% 0, 100% 100%, 0 100%);
}
.project__body { display: grid; gap: var(--s-3); }
.project__meta { display: flex; flex-wrap: wrap; gap: var(--s-2) var(--s-4); font-size: 0.875rem; color: var(--on-ink-muted); }
.project__meta li { display: inline-flex; align-items: center; gap: var(--s-2); }
.project__meta li:not(:last-child)::after { content: ""; width: 4px; height: 4px; border-radius: 50%; background: var(--line-dark); margin-left: var(--s-2); }
.project__title { font-size: var(--fs-h3); letter-spacing: -0.02em; }
.project__text { color: var(--on-ink-muted); max-width: 36rem; }
.project__facts { display: grid; gap: var(--s-3); margin-top: var(--s-3); padding-top: var(--s-4); border-top: 1px solid var(--line-dark); }
.project__facts dt { font-size: var(--fs-eyebrow); letter-spacing: .14em; text-transform: uppercase; color: var(--blue-electric); }
.project__facts dd { color: #dfe6f3; margin-bottom: var(--s-2); }

/* ---------- Process step ---------- */
.step {
  position: relative;
  display: grid; gap: var(--s-2); align-content: start;
  padding: 0 0 var(--s-7) 2.75rem;
}
.step:last-child { padding-bottom: 0; }
.step__marker {
  position: absolute; left: 0; top: 0.25rem;
  width: 0.9375rem; height: 0.9375rem; border-radius: 50%;
  background: var(--surface); border: 1.5px solid var(--line-strong);
  transition: border-color var(--t-mid) var(--ease), background var(--t-mid) var(--ease);
}
.step.is-reached .step__marker { border-color: var(--blue); background: var(--blue); box-shadow: 0 0 0 4px #e3edfb; }
.step.is-current .step__marker { border-color: var(--orange); background: var(--orange); box-shadow: 0 0 0 4px #ffeedd; }
.step__num { font-size: 0.8125rem; font-weight: 500; color: var(--blue); font-variant-numeric: tabular-nums; letter-spacing: .06em; }
.step__title { font-size: var(--fs-h3); letter-spacing: -0.02em; }
.step__text { color: var(--slate); font-size: var(--fs-small); }
.step__out {
  margin-top: var(--s-2); padding-top: var(--s-3); border-top: 1px dashed var(--line-strong);
  font-size: 0.875rem; color: var(--ink);
}
.step__out b { display: block; font-size: 0.75rem; font-weight: 500; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin-bottom: 2px; }

/* ---------- FAQ (native details) ---------- */
.faq-list { border-top: 1px solid var(--line-strong); }
.faq-item { border-bottom: 1px solid var(--line-strong); }
.faq-item summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: center; justify-content: space-between; gap: var(--s-5);
  padding-block: var(--s-5);
  font-size: clamp(1.0625rem, 1rem + 0.35vw, 1.25rem); font-weight: 500; letter-spacing: -0.01em;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary:hover { color: var(--blue); }
.faq-item__icon {
  position: relative; flex: none; width: 2rem; height: 2rem; border-radius: 50%; border: 1px solid var(--line-strong);
}
.faq-item__icon::before, .faq-item__icon::after {
  content: ""; position: absolute; left: 50%; top: 50%; width: 0.75rem; height: 1.5px; background: var(--ink);
  transform: translate(-50%, -50%); transition: transform var(--t-mid) var(--ease);
}
.faq-item__icon::after { transform: translate(-50%, -50%) rotate(90deg); }
.faq-item[open] .faq-item__icon::after { transform: translate(-50%, -50%) rotate(0deg); }
.faq-item[open] .faq-item__icon { border-color: var(--ink); }
.faq-item__body { padding: 0 3.5rem var(--s-5) 0; color: var(--slate); max-width: 44rem; }

/* ---------- Forms ---------- */
.form {
  display: grid; gap: var(--s-5);
  background: var(--surface); color: var(--ink);
  border-radius: var(--r-md); padding: clamp(1.5rem, 1rem + 2vw, 2.5rem);
}
.form__row { display: grid; gap: var(--s-5); }
.field { display: grid; gap: 0.4rem; min-width: 0; }
.field label, .field legend { font-size: 0.9063rem; font-weight: 500; }
.field__opt { font-weight: 400; color: var(--muted); }
.field input, .field select, .field textarea {
  width: 100%; min-height: 3.25rem; padding: 0.75rem 0.95rem;
  border: 1px solid var(--line-strong); border-radius: var(--r-sm); background: var(--canvas);
  font-size: 1rem; color: var(--ink);
  transition: border-color var(--t-fast), background var(--t-fast), box-shadow var(--t-fast);
}
.field select {
  appearance: none; -webkit-appearance: none; padding-right: 2.5rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%23011337' stroke-width='1.6'%3E%3Cpath d='M4 6l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 0.9rem center; background-size: 1rem;
}
.field textarea { min-height: 8.5rem; resize: vertical; line-height: 1.5; }
.field input:hover, .field select:hover, .field textarea:hover { border-color: var(--muted); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--blue); background: #fff; box-shadow: 0 0 0 3px rgba(5, 81, 199, 0.15);
}
.field[data-invalid] input, .field[data-invalid] select, .field[data-invalid] textarea { border-color: #c2261b; background: #fff8f7; }
.field__error { font-size: 0.8438rem; color: #b3261e; display: none; }
.field[data-invalid] .field__error { display: block; }
.field--check { grid-template-columns: auto 1fr; align-items: start; gap: 0.75rem; }
.field--check input {
  width: 1.25rem; height: 1.25rem; min-height: 0; margin-top: 0.15rem; padding: 0; accent-color: var(--blue);
}
.field--check label { font-weight: 400; font-size: 0.9063rem; color: var(--slate); }
.field--check .field__error { grid-column: 2; }
.form__hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form__footer { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: var(--s-4); }
.form__note { font-size: 0.8438rem; color: var(--muted); max-width: 22rem; }
.form__status {
  display: none; padding: var(--s-4); border-radius: var(--r-sm); font-size: 0.9375rem;
}
.form__status.is-visible { display: block; }
.form__status--success { background: #ebf6ef; color: #145a32; border: 1px solid #b7dfc4; }
.form__status--error { background: #fff3f2; color: #8c1d18; border: 1px solid #f2c4c0; }
.form__status--info { background: #fff6ec; color: #7a3500; border: 1px solid #f6cfa6; }

/* ---------- Motion: reveal on scroll (only when JS + motion allowed) ---------- */
@media (prefers-reduced-motion: no-preference) {
  .js [data-reveal] {
    opacity: 0;
    transform: translate(calc(14px * var(--slant)), 14px); /* enters along the Eura angle */
    transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
    transition-delay: calc(var(--i, 0) * 70ms);
  }
  .js [data-reveal].is-in { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 1ms !important; animation-duration: 1ms !important; }
}

/* ---------- Back to top ---------- */
.to-top {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 80;
  width: 2.875rem; height: 2.875rem; border-radius: 50%;
  display: grid; place-items: center;
  background: var(--ink); color: #fff; border: 1px solid var(--line-dark);
  opacity: 0; visibility: hidden; transform: translateY(8px);
  transition: opacity var(--t-mid) var(--ease), transform var(--t-mid) var(--ease), visibility 0s linear var(--t-mid);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; transition: opacity var(--t-mid) var(--ease), transform var(--t-mid) var(--ease), visibility 0s; }
.to-top svg { width: 1rem; height: 1rem; }