/* AI Invoice Maker — Phase C2 premium section navigation
   Documentation-style floating TOC (not a second header).
   CSS only. Property-limited transitions. No JS. */

:root {
  --secnav-max: 960px;
  --secnav-gap-top: 48px;
  --secnav-gap-bottom: 40px;
  --secnav-float-h: 56px;
}

/* ── Neutralize legacy full-bleed “second header” chrome ── */
.feat-secnav-wrap,
.legal-secnav-wrap,
.tut-secnav-wrap {
  position: sticky;
  top: calc(var(--header, 64px) + var(--safe-top, env(safe-area-inset-top, 0px)) + 10px);
  z-index: 200;
  isolation: isolate;
  background: transparent !important;
  border: none !important;
  border-bottom: none !important;
  backdrop-filter: none !important;
  -webkit-backdrop-filter: none !important;
  box-shadow: none !important;
  display: flex;
  justify-content: center;
  align-items: center;
  box-sizing: border-box;
}

/* Sticky engages only after hero/page-head scrolls away (nav sits below hero in DOM). */

.feat-card,
.legal-card,
.tut-card {
  scroll-margin-top: calc(
    var(--header, 64px) + var(--safe-top, env(safe-area-inset-top, 0px)) + var(--secnav-float-h) + 24px
  );
}

/* ── Shared capsule / scroller ── */
.feat-secnav,
.legal-secnav,
.tut-secnav {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 2px;
  box-sizing: border-box;
  max-width: min(var(--secnav-max), 100%);
  width: max-content;
  margin: 0 auto;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
  scroll-padding-inline: 12px;
  scrollbar-width: none;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(14, 20, 36, 0.72);
  backdrop-filter: blur(18px) saturate(1.15);
  -webkit-backdrop-filter: blur(18px) saturate(1.15);
  box-shadow:
    0 10px 36px rgba(0, 0, 0, 0.32),
    0 1px 0 rgba(255, 255, 255, 0.05) inset;
  padding: 5px 6px;
}

.feat-secnav::-webkit-scrollbar,
.legal-secnav::-webkit-scrollbar,
.tut-secnav::-webkit-scrollbar {
  display: none;
}

.feat-secnav a,
.legal-secnav a,
.tut-secnav a {
  flex-shrink: 0;
  scroll-snap-align: center;
  scroll-margin-inline: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 7px 12px;
  border-radius: 999px;
  border: 1px solid transparent;
  box-sizing: border-box;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.01em;
  line-height: 1.2;
  white-space: nowrap;
  color: rgba(255, 255, 255, 0.46);
  background: transparent;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
  transition:
    color 0.2s ease,
    background-color 0.2s ease,
    border-color 0.2s ease,
    box-shadow 0.2s ease;
}

.feat-secnav a:hover,
.legal-secnav a:hover,
.tut-secnav a:hover {
  color: rgba(255, 255, 255, 0.88);
  background: rgba(255, 255, 255, 0.06);
  border-color: transparent;
}

.feat-secnav a:focus-visible,
.legal-secnav a:focus-visible,
.tut-secnav a:focus-visible {
  color: var(--gold2, #e8c97a);
  background: rgba(201, 168, 76, 0.12);
  border-color: rgba(201, 168, 76, 0.35);
  outline: 2px solid rgba(232, 201, 122, 0.7);
  outline-offset: 2px;
  box-shadow: none;
}

/* Active = soft gold pill (CSS :target only; no JS) */
.feat-secnav a.is-active-fallback,
.legal-secnav a.is-active-fallback,
.tut-secnav a.is-active-fallback {
  color: var(--gold2, #e8c97a);
  background: rgba(201, 168, 76, 0.16);
  border-color: rgba(201, 168, 76, 0.28);
  box-shadow: none;
  font-weight: 600;
}

@media (prefers-reduced-motion: reduce) {
  .feat-secnav a,
  .legal-secnav a,
  .tut-secnav a {
    transition: none;
  }
}

/* ═══════════════ Desktop — floating centered capsule ═══════════════ */
@media (min-width: 769px) {
  /* No edge fades on desktop (they clip first/last labels). */
  .feat-secnav-wrap::before,
  .feat-secnav-wrap::after,
  .legal-secnav-wrap::before,
  .legal-secnav-wrap::after,
  .tut-secnav-wrap::before,
  .tut-secnav-wrap::after {
    content: none !important;
    display: none !important;
  }

  .feat-secnav-wrap,
  .legal-secnav-wrap,
  .tut-secnav-wrap {
    margin: var(--secnav-gap-top) 0 var(--secnav-gap-bottom);
    padding: 0 24px;
    width: 100%;
    max-width: none;
  }

  /* Hero → nav breathing room (nav margin provides the rest). */
  .feat-hero {
    padding-bottom: 8px !important;
  }

  .legal-page-head,
  .tut-page-head {
    padding-bottom: 8px !important;
  }

  .feat-main,
  .legal-main,
  .tut-main {
    padding-top: 0 !important;
  }

  .feat-secnav,
  .legal-secnav,
  .tut-secnav {
    width: max-content;
    max-width: min(var(--secnav-max), calc(100vw - 48px));
    padding: 5px 6px;
    gap: 2px;
  }

  /* Many tutorial chips: allow capsule to span up to max and scroll inside. */
  .tut-secnav {
    width: min(var(--secnav-max), calc(100vw - 48px));
    justify-content: flex-start;
  }

  .feat-secnav a,
  .legal-secnav a,
  .tut-secnav a {
    min-height: 34px;
    padding: 6px 11px;
    font-size: 12px;
  }
}

/* ═══════════════ Mobile — keep scroll / snap / fades; refine only ═══════════════ */
@media (max-width: 768px) {
  .feat-secnav-wrap,
  .legal-secnav-wrap,
  .tut-secnav-wrap {
    top: calc(var(--header, 64px) + var(--safe-top, env(safe-area-inset-top, 0px)) + 6px);
    margin: 28px 0 28px;
    padding: 0 12px;
    width: 100%;
  }

  /* Soft edge fades — clipped to the capsule, not full viewport */
  .feat-secnav-wrap::before,
  .feat-secnav-wrap::after,
  .legal-secnav-wrap::before,
  .legal-secnav-wrap::after,
  .tut-secnav-wrap::before,
  .tut-secnav-wrap::after {
    content: "";
    display: block;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    height: 48px;
    width: 28px;
    z-index: 2;
    pointer-events: none;
    border-radius: 0;
  }

  .feat-secnav-wrap::before,
  .legal-secnav-wrap::before,
  .tut-secnav-wrap::before {
    left: 12px;
    background: linear-gradient(
      to right,
      rgba(14, 20, 36, 0.95) 0%,
      rgba(14, 20, 36, 0.35) 55%,
      transparent 100%
    );
  }

  .feat-secnav-wrap::after,
  .legal-secnav-wrap::after,
  .tut-secnav-wrap::after {
    right: 12px;
    background: linear-gradient(
      to left,
      rgba(14, 20, 36, 0.95) 0%,
      rgba(14, 20, 36, 0.35) 55%,
      transparent 100%
    );
  }

  .feat-hero {
    padding-bottom: 4px !important;
  }

  .legal-page-head,
  .tut-page-head {
    padding-bottom: 4px !important;
  }

  .feat-main,
  .legal-main,
  .tut-main {
    padding-top: 0 !important;
  }

  .feat-secnav,
  .legal-secnav,
  .tut-secnav {
    width: 100%;
    max-width: 100%;
    padding: 5px 8px;
    scroll-padding-inline: 16px;
    scroll-snap-type: x proximity;
    border-radius: 16px;
    gap: 4px;
  }

  .feat-secnav a,
  .legal-secnav a,
  .tut-secnav a {
    min-height: 44px;
    padding: 8px 12px;
    font-size: 12px;
    scroll-snap-align: start;
  }
}