/* ==========================================================================
   Components: buttons, glass, logo, navigation, links
   ========================================================================== */

/* ---------- Buttons ---------- */
.btn {
  --btn-h: 54px;
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.65rem;
  min-height: var(--btn-h);
  padding: 0 1.6rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  white-space: nowrap;
  isolation: isolate;
  overflow: hidden;
  transition:
    transform var(--t) var(--ease-out),
    box-shadow var(--t) var(--ease-out),
    border-color var(--t) var(--ease-out),
    background-color var(--t) var(--ease-out);
}
.btn--sm { --btn-h: 42px; padding: 0 1.15rem; font-size: 0.9rem; }

.btn--primary {
  color: #fff;
  background: linear-gradient(135deg, #9D74FA 0%, var(--electric) 45%, #6D3FE0 100%);
  border-color: rgba(237, 233, 254, 0.35);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.35) inset, 0 10px 30px -10px rgba(139, 92, 246, 0.7);
}
/* moving sheen */
.btn--primary::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(115deg, transparent 30%, rgba(255, 255, 255, 0.38) 48%, transparent 66%);
  transform: translateX(-120%);
  transition: transform 900ms var(--ease-out);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.4) inset, 0 16px 40px -10px rgba(139, 92, 246, 0.85), 0 0 0 4px rgba(139, 92, 246, 0.14);
}
.btn--primary:hover::before { transform: translateX(120%); }
.btn--primary:active { transform: translateY(0); }

.btn--ghost {
  color: var(--text);
  background: rgba(255, 255, 255, 0.025);
  border-color: var(--line-strong);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.btn--ghost:hover {
  border-color: rgba(196, 181, 253, 0.6);
  background: rgba(139, 92, 246, 0.1);
  transform: translateY(-2px);
}

.btn__icon { width: 18px; height: 18px; transition: transform var(--t) var(--ease-out); }
.btn:hover .btn__icon { transform: translateX(4px); }

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 500;
  color: var(--lavender);
  padding-bottom: 4px;
  background: linear-gradient(var(--amethyst), var(--amethyst)) left bottom / 0 1px no-repeat;
  transition: background-size var(--t) var(--ease-out), color var(--t);
}
.link-arrow svg { width: 18px; height: 18px; transition: transform var(--t) var(--ease-out); }
.link-arrow:hover { background-size: 100% 1px; color: #fff; }
.link-arrow:hover svg { transform: translateX(4px); }

/* ---------- Glass panel (used selectively) ---------- */
.glass {
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  backdrop-filter: blur(18px) saturate(140%);
  isolation: isolate;
  overflow: hidden;
}
/* Top edge highlight */
.glass::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(160deg, rgba(237, 233, 254, 0.45), rgba(167, 139, 250, 0.08) 35%, transparent 60%, rgba(139, 92, 246, 0.25));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}
/* Pointer-following reflection (JS sets --mx / --my) */
.glass::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  background: radial-gradient(420px circle at var(--mx, 50%) var(--my, -20%), rgba(196, 181, 253, 0.14), transparent 55%);
  opacity: 0;
  transition: opacity var(--t) var(--ease-out);
  pointer-events: none;
}
.glass:hover::after { opacity: 1; }

/* ---------- Logo ---------- */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex-shrink: 0;
}
.logo__mark { flex-shrink: 0; }
.logo__mark {
  width: 28px; height: 28px;
  filter: drop-shadow(0 0 10px rgba(139, 92, 246, 0.55));
  transition: transform var(--t-slow) var(--ease-out);
}
.logo:hover .logo__mark { transform: rotate(180deg); }
.logo__word {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.28em;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--nav-h);
  transition: background-color var(--t) var(--ease-out), border-color var(--t), backdrop-filter var(--t);
  border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
  background: rgba(10, 9, 16, 0.72);
  border-bottom-color: var(--line);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
}
.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.nav__menu {
  display: flex;
  align-items: center;
  gap: 2.4rem;
}
.nav__links {
  display: flex;
  gap: 2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav__links a {
  position: relative;
  font-size: 0.92rem;
  color: var(--text-muted);
  padding: 0.4rem 0;
  transition: color var(--t-fast);
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 50%; bottom: -2px;
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--amethyst);
  box-shadow: 0 0 8px var(--electric);
  transform: translateX(-50%) scale(0);
  transition: transform var(--t) var(--ease-out);
}
.nav__links a:hover,
.nav__links a.is-active { color: var(--text); }
.nav__links a.is-active::after { transform: translateX(-50%) scale(1); }

/* ---------- Language switcher ---------- */
.lang {
  display: flex;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(8, 7, 13, 0.4);
}
.lang a {
  display: block;
  min-width: 34px;
  padding: 0.3rem 0.55rem;
  border-radius: 999px;
  text-align: center;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  transition: color var(--t-fast), background-color var(--t-fast), box-shadow var(--t-fast);
}
.lang a:hover { color: var(--text); }
.lang a[aria-current="page"] {
  color: #fff;
  background: rgba(139, 92, 246, 0.24);
  box-shadow: inset 0 0 0 1px rgba(167, 139, 250, 0.5), 0 0 14px -4px rgba(139, 92, 246, 0.8);
}

@media (min-width: 881px) and (max-width: 1180px) {
  .nav__menu { gap: 1.3rem; }
  .nav__links { gap: 1.2rem; }
  .nav__links a { font-size: 0.86rem; }
}
/* Too narrow for links + languages + CTA: the hero and "Contact" link already lead to the form. */
@media (min-width: 881px) and (max-width: 1060px) {
  .nav__cta { display: none; }
}

.nav__toggle {
  display: none;
  position: relative;
  width: 44px; height: 44px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.03);
}
.nav__toggle span {
  position: absolute;
  left: 13px; right: 13px;
  height: 1.5px;
  background: var(--text);
  transition: transform var(--t) var(--ease-out), top var(--t) var(--ease-out);
}
.nav__toggle span:first-child { top: 17px; }
.nav__toggle span:last-child { top: 25px; }
.nav__toggle[aria-expanded="true"] span:first-child { top: 21px; transform: rotate(45deg); }
.nav__toggle[aria-expanded="true"] span:last-child { top: 21px; transform: rotate(-45deg); }

@media (max-width: 880px) {
  .nav__toggle { display: block; z-index: 2; }
  .nav .logo { position: relative; z-index: 2; }
  .nav__menu {
    position: fixed;
    inset: 0;
    flex-direction: column;
    justify-content: center;
    gap: 2.5rem;
    padding: var(--nav-h) var(--gutter) 3rem;
    background:
      radial-gradient(600px 400px at 70% 20%, rgba(139, 92, 246, 0.18), transparent 70%),
      rgba(8, 7, 13, 0.97);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--t) var(--ease-out), visibility 0s linear var(--t);
  }
  .nav.is-open .nav__menu {
    opacity: 1;
    visibility: visible;
    transition: opacity var(--t) var(--ease-out);
  }
  .nav__links { flex-direction: column; align-items: center; gap: 1.6rem; }
  .nav__links a { font-family: var(--font-display); font-size: 1.8rem; color: var(--text); }
  .nav__cta { --btn-h: 52px; }
  .nav__menu .lang a { min-width: 52px; padding: 0.6rem 0.9rem; font-size: 0.85rem; }
  body.nav-open { overflow: hidden; }
  /* backdrop-filter would become the containing block for the fixed menu */
  .nav.is-open { -webkit-backdrop-filter: none; backdrop-filter: none; background: transparent; border-bottom-color: transparent; }
}