/* ============================================================
   APP SHELL — nav, tabs, tweaks panel
   ============================================================ */

/* ============================================================
   TOP BAR — chic minimalist. Logo + current page + index button.
   ============================================================ */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
  backdrop-filter: saturate(160%) blur(8px);
}
.topbar__inner {
  display: flex; align-items: center; gap: var(--s-5);
  padding: 18px var(--gutter);
  max-width: 1680px;
  margin: 0 auto;
}

/* Brand — logo mask, inherits currentColor */
.topbar__brand {
  display: inline-flex; align-items: center;
  height: 20px;
  color: var(--fg);
  text-decoration: none;
  flex-shrink: 0;
}

/* "You are here" — current page label, mono eyebrow */
.topbar__here {
  margin-left: var(--s-6);
  padding-left: var(--s-6);
  border-left: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--fg-2);
  min-height: 20px;
  display: inline-flex; align-items: center;
  transition: color 0.15s ease;
}
.topbar__here b {
  color: var(--fg); font-weight: 500;
  margin-left: 6px; letter-spacing: 0.04em;
}
.topbar__here b::before {
  content: ""; display: inline-block;
  width: 16px; height: 1px;
  background: var(--accent);
  vertical-align: middle;
  margin-right: 10px;
}

/* Index button — right-aligned, pill, mono label */
.topbar__menu {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: 10px;
  padding: 9px 16px 9px 18px;
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--rule-strong);
  border-radius: var(--r-pill);
  font-family: var(--font-sans);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.topbar__menu:hover {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.topbar__menu:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.topbar__menu[aria-expanded="true"] {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.topbar__menu .lucide {
  width: 16px; height: 16px;
  stroke-width: 1.75;
}

@media (max-width: 720px) {
  .topbar__inner { padding: 14px var(--gutter); }
  .topbar__here { display: none; }
  .topbar__menu-label { display: none; }
  .topbar__menu { padding: 9px 11px; }
}

/* ============================================================
   DRAWER — categorized full-overlay nav
   ============================================================ */
.drawer {
  position: fixed; inset: 0;
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.24s ease;
}
.drawer.is-open {
  opacity: 1;
  pointer-events: auto;
}
.drawer__scrim {
  position: absolute; inset: 0;
  background: rgba(11, 15, 20, 0.45);
  backdrop-filter: blur(2px);
}
.drawer__panel {
  position: absolute;
  top: 0; right: 0; bottom: 0;
  width: min(1040px, 100%);
  background: var(--bg);
  border-left: 1px solid var(--rule-strong);
  box-shadow: -24px 0 60px rgba(11, 15, 20, 0.08);
  display: flex; flex-direction: column;
  transform: translateX(24px);
  transition: transform 0.32s cubic-bezier(.2, .8, .2, 1);
  overflow-y: auto;
}
.drawer.is-open .drawer__panel {
  transform: translateX(0);
}

.drawer__head {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: var(--s-6);
  padding: calc(var(--s-7) * var(--density)) var(--s-7) var(--s-6);
  border-bottom: 1px solid var(--rule);
}
.drawer__title {
  display: flex; flex-direction: column; gap: 12px;
}
.drawer__h {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  line-height: 1.04;
  letter-spacing: var(--tracking-display);
  font-weight: 400;
  margin: 0;
  color: var(--fg);
}
.drawer__h em { font-style: italic; color: var(--accent); }
.drawer__close {
  width: 40px; height: 40px;
  border: 1px solid var(--rule-strong);
  background: var(--bg);
  border-radius: 50%;
  color: var(--fg);
  cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background 0.15s ease, color 0.15s ease;
  flex-shrink: 0;
}
.drawer__close:hover {
  background: var(--fg); color: var(--bg);
}
.drawer__close .lucide { width: 18px; height: 18px; }

.drawer__nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  padding: 0;
  flex: 1 1 auto;
}
@media (max-width: 820px) {
  .drawer__nav { grid-template-columns: 1fr; }
}

.drawer__col {
  padding: var(--s-6) var(--s-7);
  border-right: 1px solid var(--rule);
}
.drawer__col:last-child { border-right: 0; }
@media (max-width: 820px) {
  .drawer__col {
    border-right: 0;
    border-bottom: 1px solid var(--rule);
  }
  .drawer__col:last-child { border-bottom: 0; }
}

.drawer__cat {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg-2);
  margin-bottom: 16px;
}

.drawer__link {
  display: block;
  text-decoration: none;
  padding: 12px 0;
  border-top: 1px solid var(--rule);
  color: var(--fg);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1.25rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
  position: relative;
  transition: color 0.15s ease, padding-left 0.18s ease;
}
.drawer__link:first-of-type { border-top: 0; padding-top: 4px; }
.drawer__link span {
  display: block;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--fg-2);
  margin-top: 4px;
  font-weight: 400;
}
.drawer__link:hover {
  color: var(--fg);
  padding-left: 14px;
}
.drawer__link:hover::before {
  content: ""; position: absolute;
  left: 0; top: 50%; transform: translateY(-50%);
  width: 8px; height: 1px;
  background: var(--accent);
}
.drawer__link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
  border-radius: 2px;
}
.drawer__link[aria-current="page"] {
  color: var(--fg);
  padding-left: 16px;
  font-style: italic;
}
.drawer__link[aria-current="page"]::before {
  content: ""; position: absolute;
  left: 0; top: 8px; bottom: 8px;
  width: 2px;
  background: var(--accent);
}

.drawer__foot {
  display: flex; justify-content: space-between; align-items: center;
  gap: var(--s-5);
  padding: var(--s-5) var(--s-7);
  border-top: 1px solid var(--rule);
  background: var(--bg-2);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--fg-2);
}
.drawer__foot a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: color 0.15s ease, border-color 0.15s ease;
}
.drawer__foot a:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.drawer__foot kbd {
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 6px;
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 3px;
  color: var(--fg);
  letter-spacing: 0;
}
@media (max-width: 720px) {
  .drawer__foot { flex-direction: column; align-items: flex-start; gap: 8px; }
}

/* Lock scroll while drawer open */
body.drawer-open { overflow: hidden; }

/* Footer */
.footer {
  border-top: 1px solid var(--rule);
  padding: var(--s-7) 0;
  margin-top: var(--s-9);
}
.footer__inner {
  display: flex; justify-content: space-between; align-items: center;
  font-size: var(--fs-xs); letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase; color: var(--fg-2);
}
.footer__logo { height: 16px; }

/* ============================================================
   TWEAKS PANEL
   ============================================================ */
.tweaks {
  position: fixed;
  right: 24px; bottom: 24px;
  width: 320px;
  background: var(--bg);
  border: 1px solid var(--rule-strong);
  border-radius: var(--r-3);
  box-shadow: var(--shadow-3);
  z-index: 100;
  display: none;
  font-size: var(--fs-sm);
}
.tweaks.is-open { display: block; }
.tweaks__head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--rule);
  font-size: var(--fs-xs); letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase; font-weight: 500;
}
.tweaks__body { padding: 8px 20px 20px; max-height: 70vh; overflow: auto; }
.tweaks__group {
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
}
.tweaks__group:last-child { border-bottom: 0; }
.tweaks__label {
  font-size: var(--fs-xs); letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase; color: var(--fg-2); margin-bottom: 10px;
  display: block;
}
.tweaks__row { display: flex; gap: 6px; flex-wrap: wrap; }
.tweaks__col { display: flex; flex-direction: column; gap: 6px; }

.tweak-pair {
  display: flex; align-items: center; gap: 14px;
  padding: 10px 12px;
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--fg);
  border-radius: var(--r-2);
  font-size: 13px;
  text-align: left;
  width: 100%;
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease;
}
.tweak-pair:hover { border-color: var(--rule-strong); }
.tweak-pair[aria-pressed="true"] {
  border-color: var(--fg);
  background: var(--bg-2);
}
.tweak-pair__preview {
  flex: 0 0 auto;
  font-size: 24px;
  line-height: 1;
  width: 48px;
  color: var(--fg);
  display: inline-flex; align-items: baseline; gap: 2px;
}
.tweak-pair__preview em { color: var(--accent); }
.tweak-pair__meta { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.tweak-pair__meta b {
  font-weight: 500; font-size: 13px;
  font-family: var(--font-sans);
}
.tweak-pair__meta span {
  font-size: 11px; color: var(--fg-2);
  font-family: var(--font-sans);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.tweak-pair[aria-pressed="true"] .tweak-pair__meta b { color: var(--fg); }
.tweak-btn {
  flex: 1 1 auto;
  min-width: 0;
  padding: 8px 10px;
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--fg);
  border-radius: var(--r-2);
  font-size: 13px;
  text-align: center;
}
.tweak-btn[aria-pressed="true"] {
  background: var(--fg); color: var(--bg); border-color: var(--fg);
}
.tweak-swatch {
  width: 36px; height: 36px; border-radius: 50%;
  border: 2px solid var(--rule);
  cursor: pointer; padding: 0;
  flex: 0 0 auto;
}
.tweak-swatch[aria-pressed="true"] {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}

/* Tiny floating hint when Tweaks is on but panel closed */
.tweaks-toggle-hint {
  position: fixed; right: 24px; bottom: 24px; z-index: 100;
  padding: 10px 16px;
  background: var(--fg); color: var(--bg);
  border-radius: var(--r-pill);
  font-size: var(--fs-xs); letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  border: 0; box-shadow: var(--shadow-2);
  display: none;
}
.tweaks-toggle-hint.is-visible { display: inline-flex; align-items: center; gap: 8px; }
.tweaks-toggle-hint .lucide { width: 14px; height: 14px; stroke-width: 1.75; }
.drawer__foot a .lucide { width: 12px; height: 12px; stroke-width: 1.75; vertical-align: middle; margin-left: 4px; }