/* ==========================================================================
   Naýbaşy Syýahat — Navbar
   Золотые навигационные кнопки в стиле логотипа.
   ========================================================================== */

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background:
    radial-gradient(1200px 600px at 50% -10%, rgba(201, 162, 75, 0.10), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

/* --- Шапка --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.85rem clamp(1rem, 4vw, 3rem);
  background: color-mix(in srgb, var(--surface) 82%, transparent);
  backdrop-filter: blur(14px) saturate(120%);
  border-bottom: 1px solid var(--gold-line-soft);
  transition: padding var(--duration-normal) var(--ease-out-expo),
              background var(--duration-normal) var(--ease-out-expo);
}

/* Тонкая золотая линия-аура под шапкой */
.site-header::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold-line), transparent);
  opacity: 0.7;
}

.site-header.is-scrolled {
  padding-top: 0.55rem;
  padding-bottom: 0.55rem;
  background: color-mix(in srgb, var(--bg-deep) 90%, transparent);
}

/* --- Логотип --- */
.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  flex-shrink: 0;
}

.brand__logo {
  height: 52px;
  width: auto;
  display: block;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.4));
  transition: transform var(--duration-normal) var(--ease-out-expo);
}
.brand:hover .brand__logo { transform: scale(1.04); }

/* Текстовый фолбэк, если logo.png ещё не положили */
.brand__wordmark {
  display: flex;
  flex-direction: column;
  line-height: 1;
}
.brand__name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  background: var(--grad-gold);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.brand__tag {
  margin-top: 4px;
  font-size: 0.56rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--gold-mid);
}

/* --- Навигация --- */
.nav {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 0.62rem 1.15rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--gold-line-soft);
  background: transparent;
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  overflow: hidden;
  isolation: isolate;
  transition: color var(--duration-fast) var(--ease-out-expo),
              border-color var(--duration-fast) var(--ease-out-expo),
              transform var(--duration-fast) var(--ease-out-expo),
              box-shadow var(--duration-normal) var(--ease-out-expo);
}

/* Золотая заливка появляется снизу */
.nav__link::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--grad-gold);
  opacity: 0;
  transform: translateY(100%);
  transition: opacity var(--duration-normal) var(--ease-out-expo),
              transform var(--duration-normal) var(--ease-out-expo);
}

/* Блик-«металл», пробегающий по кнопке */
.nav__link::after {
  content: "";
  position: absolute;
  top: 0; left: -120%;
  width: 60%; height: 100%;
  background: linear-gradient(
    100deg,
    transparent,
    rgba(255, 255, 255, 0.45),
    transparent
  );
  transform: skewX(-18deg);
  transition: left var(--duration-normal) var(--ease-out-expo);
  pointer-events: none;
}

.nav__link:hover,
.nav__link:focus-visible {
  color: var(--text-dark);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
  outline: none;
}
.nav__link:hover::before,
.nav__link:focus-visible::before {
  opacity: 1;
  transform: translateY(0);
}
.nav__link:hover::after,
.nav__link:focus-visible::after { left: 130%; }

.nav__link:active { transform: translateY(0) scale(0.98); }

/* Активный пункт — залит золотом постоянно */
.nav__link.is-active {
  color: var(--text-dark);
  border-color: transparent;
  box-shadow: var(--shadow-gold);
}
.nav__link.is-active::before { opacity: 1; transform: translateY(0); }

/* --- Переключатель языка (RU / TK / EN) --- */
.lang {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--gold-line-soft);
  border-radius: var(--radius-pill);
  flex-shrink: 0;
}
.lang__btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 0.34rem 0.6rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: color var(--duration-fast) var(--ease-out-expo),
              background var(--duration-fast) var(--ease-out-expo);
}
.lang__btn:hover { color: var(--text); }
.lang__btn.is-active {
  color: var(--text-dark);
  background: var(--grad-gold);
}

/* --- Бургер (мобильный) --- */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 44px; height: 44px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--gold-line-soft);
  border-radius: 12px;
  cursor: pointer;
}
.burger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--gold);
  border-radius: 2px;
  transition: transform var(--duration-normal) var(--ease-out-expo),
              opacity var(--duration-fast) var(--ease-out-expo);
}
.burger.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.is-open span:nth-child(2) { opacity: 0; }
.burger.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* --- Адаптив --- */
@media (max-width: 900px) {
  .burger { display: flex; }

  .nav {
    position: fixed;
    top: 0; right: 0;
    height: 100dvh;
    width: min(80vw, 320px);
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
    gap: 0.6rem;
    padding: 2rem 1.5rem;
    background: var(--surface);
    border-left: 1px solid var(--gold-line-soft);
    box-shadow: var(--shadow-soft);
    transform: translateX(100%);
    transition: transform var(--duration-normal) var(--ease-out-expo);
  }
  .nav.is-open { transform: translateX(0); }
  .nav__link { font-size: 1rem; padding: 0.85rem 1.2rem; justify-content: center; }
}

/* --- Демо-подложка под навбаром (только для прототипа) --- */
.demo-stage {
  display: grid;
  place-items: center;
  min-height: 70vh;
  text-align: center;
  padding: 4rem 1.5rem;
}
.demo-stage h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2rem, 1rem + 5vw, 4.5rem);
  letter-spacing: 0.04em;
  background: var(--grad-gold);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.demo-stage p {
  margin-top: 1rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}