/* ==========================================================================
   components/drawer.css — TOC drawer / rail UI ONLY
   Owns:
   - .toc-toggle button
   - .toc-panel styling + open/close behavior
   - rail spacing so it NEVER overlaps article
   - Desktop sticky rail that NEVER rides over footer (bounded by .story-body)
   Depends on:
   - body.toc-open toggled by drawer.js
   Scoped to:
   - body.story (story pages only)
   ========================================================================== */

/* ==========================================================================
   TOC boot guard — prevent first-paint transitions/jank
   drawer.js removes .toc-booting when state is finalized
   ========================================================================== */

/* While booting, do NOT animate or transition anything TOC-related */
html.toc-booting body.story .story-layout--toc,
html.toc-booting body.story .story-aside,
html.toc-booting body.story .toc-toggle,
html.toc-booting body.story .toc-panel,
html.toc-booting body.story .toc-backdrop{
  transition: none !important;
  animation: none !important;
}

/* --------------------------------------------------------------------------
   1) Toggle button (always visible)
   -------------------------------------------------------------------------- */

body.story .toc-toggle{
  appearance: none;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(17,21,27,.92);
  color: rgba(232,237,245,.92);

  border-radius: 12px;
  padding: 8px 10px;

  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;

  width: 100%;
  max-width: 100%;

  box-shadow: var(--shadow);
  cursor: pointer;
  user-select: none;
  text-decoration: none;
}

body.story .toc-toggle:hover{
  border-color: rgba(215,188,161,.35);
  background: rgba(215,188,161,.06);
}

body.story .toc-toggle:focus-visible{
  outline: none;
  border-color: rgba(215,188,161,.6);
}

/* --------------------------------------------------------------------------
   2) Panel styling (shared)
   -------------------------------------------------------------------------- */

body.story .toc-panel{
  margin-top: 10px;

  border: 1px solid rgba(255,255,255,.12);
  border-radius: calc(var(--radius) + 6px);
  background: rgba(17,21,27,.96);
  box-shadow: var(--shadow);

  overflow: hidden;
  z-index: 65;
}

body.story .toc-panel-head{
  display:flex;
  align-items:center;
  justify-content: space-between;
  gap: 10px;

  padding: 12px 14px;
  border-bottom: 1px solid rgba(255,255,255,.10);
}

body.story .toc-panel-title{
  margin: 0;
  font-size: 14px;
  letter-spacing: .01em;
  color: rgba(232,237,245,.92);
}

body.story .toc-panel-close{
  border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.04);
  color: var(--text);
  border-radius: 10px;
  width: 34px;
  height: 34px;
  line-height: 30px;
  cursor: pointer;

  display: inline-flex;
  align-items: center;
  justify-content: center;
}

body.story .toc-panel-close:hover{
  border-color: rgba(215,188,161,.35);
  background: rgba(215,188,161,.06);
}

body.story .toc-panel-nav{
  display: grid;
  gap: 8px;
  padding: 12px 14px 14px;
}

body.story .toc-panel-nav .toc-link{
  text-decoration: none;
  color: rgba(232,237,245,.86);

  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: rgba(255,255,255,.02);
}

body.story .toc-panel-nav .toc-link:hover{
  border-color: rgba(215,188,161,.25);
  background: rgba(215,188,161,.06);
}

body.story .toc-panel-nav .toc-link.is-active{
  border-color: rgba(215,188,161,.35);
  background: rgba(215,188,161,.10);
  color: rgba(232,237,245,.96);
}

/* --------------------------------------------------------------------------
   3) Small screens (<640): bottom drawer + backdrop (overlay)
   -------------------------------------------------------------------------- */

body.story .toc-backdrop{
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  z-index: 64;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s ease;
}

@media (max-width: 639px){
  body.story .toc-panel{
    position: fixed;
    right: 12px;
    left: 12px;
    bottom: 12px;

    max-height: 72vh;

    transform: translateY(120%);
    transition: transform .18s ease;
  }

  body.story.toc-open .toc-panel{
    transform: translateY(0);
  }

  body.story.toc-open .toc-backdrop{
    opacity: 1;
    pointer-events: auto;
  }
}

/* --------------------------------------------------------------------------
   4) Medium + Desktop (>=640): TOC stays on the RIGHT (no stacking)
   IMPORTANT:
   - story-card.css stacks to 1 col at max-width:980px
   - We override that here so 640–980 is still 2-col with a right rail.
   + Sticky rail is bounded by .story-body so it won't float over footer.
   -------------------------------------------------------------------------- */

@media (min-width: 640px){

  /* Footer-safe runway: sticky is bounded by .story-body.
     This padding gives the rail room to "unstick" before footer. */
  body.story .story-body{
    padding-bottom: 140px; /* tune 120–220 based on footer height */
  }

  /* Create clear air between article column and rail */
  body.story .story-layout--toc{
    grid-template-columns: minmax(0, 1fr) 320px;

    /* More space so the drawer never “kisses” the container edge visually */
    column-gap: clamp(26px, 3vw, 44px);
    row-gap: 28px;

    align-items: start;
    width: 100%;
  }

  /* CLOSED: collapse rail but keep a slim strip for the toggle */
  body.story:not(.toc-open) .story-layout--toc{
    grid-template-columns: minmax(0, 1fr) 52px;

    column-gap: clamp(22px, 2.6vw, 36px);
    row-gap: 22px;
  }

  /* Make the entire rail sticky (bounded by .story-body) */
  body.story .story-aside{
    position: sticky;

    /* Use a token if you have one; fallback keeps it stable */
    top: calc(var(--nav-h, 72px) + 18px);

    align-self: start;
    min-width: 0;
    z-index: 10;

    /* Optional micro-offset so the rail feels detached from the container edge */
    padding-left: 2px;

    /* Slight breathing room from the container edge */
    padding-right: 10px;

    /* repaint containment (fine) */
    contain: paint;
    transform: translateZ(0);
  }

  /* Panel stays in-flow for desktop rail */
  body.story .toc-panel{
    position: static;
    width: 100%;
    display: block;

    max-height: 1000px;
    opacity: 1;
    transform: translateY(0);

    transition: opacity .14s ease, transform .14s ease, max-height .18s ease;
    will-change: opacity, transform, max-height;
  }

  /* Hide the panel when closed WITHOUT display:none (prevents paint/refresh glitch) */
  body.story:not(.toc-open) .toc-panel{
    max-height: 0;
    opacity: 0;
    transform: translateY(-6px);
    pointer-events: none;
    margin-top: 0;
  }

  body.story:not(.toc-open) .toc-panel-head,
  body.story:not(.toc-open) .toc-panel-nav{
    padding-top: 0;
    padding-bottom: 0;
  }

  /* Desktop: backdrop is never used */
  body.story .toc-backdrop{
    display: none !important;
  }

  /* Closed rail: rotate the toggle label */
  body.story:not(.toc-open) .toc-toggle{
    justify-content: center;
    padding: 8px 6px;
    border-radius: 14px;
    writing-mode: vertical-rl;
    text-orientation: mixed;
  }

  body.story:not(.toc-open) .toc-toggle .nav-caret{
    display: none;
  }

  /* Desktop rail: remove redundant modal UI */
  body.story .toc-panel-title{ display: none; }
  body.story .toc-panel-close{ display: none; }

  body.story .toc-panel-head{
    padding-top: 8px;
    padding-bottom: 8px;
    border-bottom: none;
  }
}

/* --------------------------------------------------------------------------
   5) Widescreen polish (>=981): stop any “edge kiss” and micro-overlap feel
   -------------------------------------------------------------------------- */

@media (min-width: 981px){
  body.story .story-aside{
    padding-right: 12px; /* a touch more than 2px so it reads clean on big screens */
  }
}

/* Extra air on very wide screens */
@media (min-width: 981px){
  body.story .story-layout--toc{
    column-gap: clamp(34px, 3vw, 52px);
  }
}

/* ==========================================================================
   TOC: second-level (h3) styling
   ========================================================================== */

body.story .toc-panel-nav .toc-link--h3{
  margin-left: 12px;
  padding: 9px 12px;
  border-radius: 12px;
  font-size: 13px;
  opacity: .92;
  background: rgba(255,255,255,.015);
}

body.story .toc-panel-nav .toc-link--h3::before{
  content: "•";
  opacity: .45;
  margin-right: 8px;
}

body.story .toc-panel-nav .toc-link--h3.is-active{
  opacity: 1;
}

/* Second-level TOC links */
body.story .toc-sub{
  display: grid;
  gap: 8px;
  margin: -2px 0 10px;
  padding-left: 14px;
  border-left: 1px solid rgba(255,255,255,.08);
}

body.story .toc-sublink{
  text-decoration: none;
  color: rgba(232,237,245,.78);
  padding: 8px 10px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: rgba(255,255,255,.015);
}

body.story .toc-sublink:hover{
  border-color: rgba(215,188,161,.20);
  background: rgba(215,188,161,.05);
}

body.story .toc-sublink.is-active{
  border-color: rgba(215,188,161,.30);
  background: rgba(215,188,161,.08);
  color: rgba(232,237,245,.92);
}