/* ═══════════════════════════════════════════════════════════════
   KYRO — Navigation & Header
   ═══════════════════════════════════════════════════════════════ */
@layer components {

  /* ── Top Bar ───────────────────────────────────────────────── */
  .nav {
    position: fixed;
    inset-block-start: 0;
    inset-inline: 0;
    z-index: var(--z-sticky);
    padding-block: var(--space-4);
    transition: background var(--duration-base) var(--ease-out),
                backdrop-filter var(--duration-base) var(--ease-out),
                border-color var(--duration-base) var(--ease-out);
    border-block-end: 1px solid transparent;
  }
  .nav.is-scrolled {
    background: var(--surface-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-block-end-color: var(--surface-glass-border);
  }

  .nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-inline-size: var(--container-wide);
    margin-inline: auto;
    padding-inline: var(--gutter);
  }

  /* ── Logo ──────────────────────────────────────────────────── */
  .nav__logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.03em;
    color: var(--text-primary);
  }
  .nav__logo-svg {
    color: var(--accent);
    flex-shrink: 0;
  }

  /* ── Links ─────────────────────────────────────────────────── */
  .nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-1);
  }
  .nav__link {
    font-size: var(--text-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-tertiary);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    transition: color var(--duration-fast) var(--ease-out),
                background var(--duration-fast) var(--ease-out);
    position: relative;
  }
  .nav__link:hover {
    color: var(--text-primary);
    background: rgba(0, 0, 0, 0.04);
  }
  .nav__link.is-active {
    color: var(--accent);
  }

  /* ── Nav Dropdown ──────────────────────────────────────────── */
  .nav__dropdown {
    position: relative;
  }
  .nav__dropdown-trigger {
    display: flex;
    align-items: center;
    gap: var(--space-1);
  }
  .nav__dropdown-trigger svg {
    inline-size: 1rem;
    block-size: 1rem;
    transition: transform var(--duration-fast) var(--ease-out);
  }
  .nav__dropdown:hover .nav__dropdown-trigger svg {
    transform: rotate(180deg);
  }
  .nav__dropdown-menu {
    position: absolute;
    inset-block-start: calc(100% + var(--space-2));
    inset-inline-start: 50%;
    transform: translateX(-50%) translateY(0.5rem);
    opacity: 0;
    visibility: hidden;
    min-inline-size: 16rem;
    background: var(--surface-overlay);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--surface-glass-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2);
    box-shadow: var(--shadow-xl);
    transition: opacity var(--duration-base) var(--ease-out),
                transform var(--duration-base) var(--ease-out),
                visibility var(--duration-base);
    z-index: var(--z-dropdown);
  }
  .nav__dropdown:hover .nav__dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
  }
  .nav__dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    transition: background var(--duration-fast), color var(--duration-fast);
  }
  .nav__dropdown-item:hover {
    background: rgba(0, 0, 0, 0.04);
    color: var(--text-primary);
  }
  .nav__dropdown-icon {
    inline-size: 2rem;
    block-size: 2rem;
    border-radius: var(--radius-sm);
    background: var(--accent-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
    font-size: var(--text-sm);
    flex-shrink: 0;
  }

  /* ── CTA Group ─────────────────────────────────────────────── */
  .nav__cta {
    display: flex;
    align-items: center;
    gap: var(--space-3);
  }

  /* ── Mobile Toggle ─────────────────────────────────────────── */
  .nav__toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    inline-size: 1.5rem;
    padding: 0;
    position: relative;
    z-index: 10;
  }
  .nav__toggle span {
    display: block;
    block-size: 2px;
    inline-size: 100%;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--duration-base) var(--ease-out);
  }

  @media (max-width: 1024px) {
    .nav__links {
      display: none;
    }
    .nav__cta .btn--secondary {
      display: none;
    }
    .nav__toggle {
      display: flex;
    }

    /* Mobile active state overlay */
    .nav.is-open {
      background: var(--surface-base);
      block-size: 100dvh;
      overflow-y: auto;
      border-block-end: 1px solid var(--border-subtle);
    }
    .nav.is-open .nav__inner {
      flex-direction: column;
      align-items: stretch;
      padding-block: var(--space-4);
      gap: var(--space-6);
    }
    .nav.is-open .nav__links {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: var(--space-2);
      inline-size: 100%;
      animation: slide-down 0.3s var(--ease-out) forwards;
    }
    .nav.is-open .nav__link {
      font-size: var(--text-lg);
      padding: var(--space-2) var(--space-4);
      inline-size: 100%;
    }
    .nav.is-open .nav__dropdown-menu {
      position: static;
      transform: none;
      opacity: 1;
      visibility: visible;
      background: var(--surface-raised);
      border: none;
      box-shadow: none;
      margin-block-start: var(--space-1);
      margin-inline-start: var(--space-4);
      inline-size: calc(100% - var(--space-4));
    }
    .nav.is-open .nav__cta {
      display: flex;
      flex-direction: column;
      gap: var(--space-3);
      inline-size: 100%;
      margin-block-start: var(--space-4);
      padding-inline: var(--space-4);
      animation: slide-down 0.3s var(--ease-out) 0.05s forwards;
    }
    .nav.is-open .nav__cta .btn {
      inline-size: 100%;
    }

    /* Hamburger transformation to X */
    .nav.is-open .nav__toggle span:nth-child(1) {
      transform: translateY(8px) rotate(45deg);
    }
    .nav.is-open .nav__toggle span:nth-child(2) {
      opacity: 0;
    }
    .nav.is-open .nav__toggle span:nth-child(3) {
      transform: translateY(-8px) rotate(-45deg);
    }
  }

  @keyframes slide-down {
    from { opacity: 0; transform: translateY(-1rem); }
    to { opacity: 1; transform: translateY(0); }
  }
}