/* ============================================================
   Scale-Proof — POLISH LAYER (additive, namespaced)
   Linked AFTER styles.css. Detail-only micro-interactions,
   nav behavior, scroll progress, selection + scrollbar.
   No layout / spacing / rhythm changes.
   ============================================================ */

/* ---------- 1. Scroll progress bar ---------- */
#sp-progress {
  position: fixed;
  top: 0; left: 0;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  z-index: 60;                 /* above .nav (z 50) */
  background: linear-gradient(90deg, var(--purple), var(--purple-2) 45%, var(--green));
  box-shadow: 0 0 10px -2px rgba(137, 87, 229, .6);
  pointer-events: none;
  will-change: transform;
}

/* ---------- 1b. Nav condense on scroll ---------- */
.nav {
  transition: background .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.nav.is-scrolled {
  background: rgba(13, 17, 23, .85);
  border-bottom-color: #3a424d;      /* a touch brighter than --border-2 */
  box-shadow: 0 8px 24px -20px rgba(0, 0, 0, .9);
  backdrop-filter: saturate(170%) blur(18px);
  -webkit-backdrop-filter: saturate(170%) blur(18px);
}
.nav__inner { transition: height .3s var(--ease); }
.nav.is-scrolled .nav__inner { height: 56px; }

/* ---------- 2. Button micro-interactions ---------- */
/* Sheen sweep on primary — layered so it never disturbs layout */
.btn--primary { position: relative; overflow: hidden; }
.btn--primary::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(115deg, transparent 30%, rgba(255, 255, 255, .18) 48%, transparent 62%);
  transform: translateX(-120%);
  transition: transform .6s var(--ease);
  pointer-events: none;
}
.btn--primary:hover::after { transform: translateX(120%); }
/* Deepen the existing hover gradient a hair (matches token palette) */
.btn--primary:hover {
  background: linear-gradient(180deg, #a679f2, #7d4bd8);
}

/* Ghost button — refined border glow on hover */
.btn--ghost {
  transition: transform .18s var(--ease), background .18s, border-color .18s, box-shadow .25s;
}
.btn--ghost:hover {
  box-shadow: 0 0 0 1px rgba(137, 87, 229, .35), 0 10px 26px -18px rgba(137, 87, 229, .6);
}

/* ---------- 3. Eyebrow leading accent tick ---------- */
/* The eyebrow text already starts with "/". Add a small gradient tick
   before it so section labels feel crafted. No vertical-rhythm impact. */
.eyebrow::before {
  content: "";
  display: inline-block;
  width: 3px;
  height: 14px;
  margin-right: 9px;
  vertical-align: -2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--purple-2), var(--green));
  box-shadow: 0 0 8px -1px rgba(137, 87, 229, .55);
}

/* ---------- 4. Animated underline-on-hover for text links ---------- */
.feature__link,
.nav__links a {
  position: relative;
}
.feature__link::after,
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -3px;
  height: 1.5px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--purple-2), var(--green));
  transition: transform .28s var(--ease);
  pointer-events: none;
}
.feature__link:hover::after,
.nav__links a:hover::after { transform: scaleX(1); }

/* keep the arrow motion feeling consistent */
.feature__link .arrow { transition: transform .2s var(--ease); }
.feature__link:hover .arrow { transform: translateX(3px); }

/* ---------- 5. Card / surface hover consistency ---------- */
/* NOTE: .card, .tier, .agent, .terminal are 3D-tilt-managed by motion.js —
   applying a translateY hover here would override their tilt transform.
   So limit the lift to non-tilt surfaces (.metric, .b2b). */
.metric, .b2b {
  transition: transform .25s var(--ease), border-color .25s var(--ease), box-shadow .3s var(--ease);
}
.metric:hover, .b2b:hover {
  transform: translateY(-2px);
  border-color: #45505f;
}

/* Footer social — subtle lift to match */
.footer__social a { transition: border-color .15s, color .15s, transform .2s var(--ease); }
.footer__social a:hover { transform: translateY(-2px); }

/* ---------- 6. Selection + custom scrollbar ---------- */
::selection {
  background: rgba(137, 87, 229, .32);
  color: #fff;
}
::-moz-selection {
  background: rgba(137, 87, 229, .32);
  color: #fff;
}

html {
  scrollbar-width: thin;
  scrollbar-color: #30363d transparent;
}
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--ink-2); }
::-webkit-scrollbar-thumb {
  background: #2b323d;
  border-radius: var(--pill);
  border: 2px solid var(--ink-2);
}
::-webkit-scrollbar-thumb:hover { background: #3a424d; }

/* ---------- 7. Reduced-motion: keep progress bar, drop the flourishes ---------- */
@media (prefers-reduced-motion: reduce) {
  #sp-progress { box-shadow: none; }          /* bar stays (functional, not motion) */
  .btn--primary::after { display: none; }
  .btn--primary:hover::after { transform: none; }
  .feature__link::after,
  .nav__links a::after,
  .card, .tier, .metric,
  .nav, .nav__inner, .footer__social a {
    transition: none;
  }
  .card:hover,
  .tier:not(.tier--win):hover,
  .metric:hover,
  .footer__social a:hover { transform: none; }
  .feature__link:hover::after,
  .nav__links a:hover::after { transform: scaleX(1); }
}