/* =====================================================================
   My UIverse — Component Library
   styles.css  (v4 — invisible-on-hero navbar, no-clip previews,
   glow-preserving buttons, subscribe-style fill on click)
   ===================================================================== */

/* ----------  Design Tokens  ---------- */
:root {
  --bg: #FFFFFF;
  --bg-elev: #F5F5F5;
  --bg-elev-2: #EFEFEF;
  --text: #1A1A1A;
  --text-muted: #666666;
  --text-faint: #999999;
  --border: #E5E5E5;
  --border-strong: #D0D0D0;
  --accent: #666666;
  --accent-hover: #1A1A1A;
  --fav-color: #E53935;

  --cat-all: #666666;
  --cat-buttons: #3B82F6;
  --cat-cards: #8B5CF6;
  --cat-loaders: #F59E0B;
  --cat-forms: #10B981;
  --cat-navigation: #06B6D4;
  --cat-animations: #EC4899;
  --cat-headers: #6366F1;
  --cat-heroes: #D97706;
  --cat-favorites: #E53935;

  --code-bg: #1A1A1A;
  --code-text: #E5E5E5;

  --radius-card: 12px;
  --radius-button: 8px;
  --radius-pill: 999px;
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-card-hover: 0 12px 36px rgba(0, 0, 0, 0.14);
  --shadow-header: 0 1px 0 rgba(0, 0, 0, 0.06), 0 8px 24px rgba(0, 0, 0, 0.06);
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --dur: 0.4s;

  --maxw: 1340px;
  --gutter: 24px;
  --header-h: 56px;
  --grid-gap: 20px;
  --dropdown-h: 400px;

  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, SFMono-Regular, Menlo, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0A0A0A;
    --bg-elev: #1A1A1A;
    --bg-elev-2: #242424;
    --text: #FFFFFF;
    --text-muted: #A8A8A8;
    --text-faint: #6E6E6E;
    --border: #2A2A2A;
    --border-strong: #3A3A3A;
    --accent: #A8A8A8;
    --accent-hover: #FFFFFF;

    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.5);
    --shadow-card-hover: 0 12px 36px rgba(0, 0, 0, 0.65);
    --shadow-header: 0 1px 0 rgba(255, 255, 255, 0.04), 0 8px 24px rgba(0, 0, 0, 0.6);
  }
}

/* ----------  Reset & Base  ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
h1, h2, h3, h4 { margin: 0; font-weight: 700; letter-spacing: -0.01em; line-height: 1.2; }
p { margin: 0; }
a { color: var(--accent); text-decoration: none; transition: color 0.2s var(--ease); }
a:hover { color: var(--accent-hover); }
button { font-family: inherit; font-size: inherit; cursor: pointer; border: none; background: none; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.skip-link { position: absolute; left: -9999px; top: 0; z-index: 9999; padding: 12px 20px; background: var(--accent); color: var(--bg); border-radius: 0 0 var(--radius-button) 0; font-weight: 600; }
.skip-link:focus { left: 0; }

/* ----------  Sticky Header (invisible on hero, appears on scroll)  ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  height: var(--header-h);
  padding: 0 var(--gutter);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.4s var(--ease), border-color 0.4s var(--ease),
              box-shadow 0.4s var(--ease), opacity 0.4s var(--ease);
  opacity: 0;
  pointer-events: none;
}
.site-header.is-visible {
  opacity: 1;
  pointer-events: auto;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-header);
}
@media (prefers-color-scheme: dark) {
  .site-header.is-visible { background: rgba(10, 10, 10, 0.9); }
}

.site-header__center {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.02em;
  color: var(--text);
  white-space: nowrap;
}

.site-header__stats {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-left: auto;
}
.site-header__stat {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}
.site-header__stat svg { width: 15px; height: 15px; color: var(--text-faint); }

/* ----------  Hero  ---------- */
.hero {
  position: relative;
  min-height: 38vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px var(--gutter) 64px;
  text-align: center;
  background: radial-gradient(ellipse at top, rgba(102, 102, 102, 0.18), transparent 60%), linear-gradient(180deg, #0A0A0A 0%, #1A1A1A 100%);
  color: #FFFFFF;
  overflow: hidden;
}
.hero > * { position: relative; z-index: 1; }
.hero__title { font-size: clamp(32px, 5vw, 52px); font-weight: 700; letter-spacing: -0.02em; margin-bottom: 40px; }
.hero__stats { display: flex; flex-wrap: wrap; justify-content: center; gap: 56px; }
.hero__stat { display: flex; flex-direction: column; align-items: center; gap: 4px; }
.hero__stat-num { font-size: 36px; font-weight: 700; letter-spacing: -0.02em; color: #FFFFFF; font-variant-numeric: tabular-nums; }
.hero__stat-label { font-size: 11px; font-weight: 500; letter-spacing: 2px; text-transform: uppercase; color: #7C7C7C; }

/* ----------  Catalog Bar  ---------- */
.main { max-width: var(--maxw); margin: 0 auto; padding: 40px var(--gutter) 72px; }

.catalog-bar { margin-bottom: 32px; }

.catalog-bar__search {
  position: relative;
  max-width: 520px;
  margin: 0 auto 24px;
}
.catalog-bar__search input {
  width: 100%;
  height: 44px;
  padding: 0 20px 0 44px;
  font-family: inherit;
  font-size: 14px;
  color: var(--text);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.catalog-bar__search input::placeholder { color: var(--text-faint); }
.catalog-bar__search input:focus {
  outline: none;
  border-color: var(--text-muted);
  background: var(--bg);
  box-shadow: 0 0 0 3px rgba(102, 102, 102, 0.12);
}
.catalog-bar__search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--text-faint);
  pointer-events: none;
}

/* ----------  Horizontal Scroll Filter Bar  ---------- */
.filter-bar-wrapper {
  position: relative;
  margin: 0 0 20px;
  /* Equal space on both sides inherited from .main padding */
}
.filter-bar {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  overflow-y: hidden; /* can't be visible when x is auto (CSS quirk) */
  scroll-behavior: smooth;
  /* Generous vertical padding so chip glows aren't clipped by overflow */
  padding: 24px 12px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  -ms-overflow-style: none;
  /* Center chips when they fit; scroll when they overflow */
  justify-content: safe center;
}
.filter-bar::-webkit-scrollbar { display: none; }

/* Filter chips — NO left border accent; color only on active */
.filter-chip {
  flex-shrink: 0;
  padding: 10px 22px;
  font-family: inherit;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text);
  background: var(--bg-elev);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-pill);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.3s var(--ease);
  --chip-color: var(--cat-all);
}
.filter-chip[data-filter="buttons"]    { --chip-color: var(--cat-buttons); }
.filter-chip[data-filter="cards"]      { --chip-color: var(--cat-cards); }
.filter-chip[data-filter="loaders"]    { --chip-color: var(--cat-loaders); }
.filter-chip[data-filter="forms"]      { --chip-color: var(--cat-forms); }
.filter-chip[data-filter="navigation"] { --chip-color: var(--cat-navigation); }
.filter-chip[data-filter="animations"] { --chip-color: var(--cat-animations); }
.filter-chip[data-filter="headers"]    { --chip-color: var(--cat-headers); }
.filter-chip[data-filter="heroes"]     { --chip-color: var(--cat-heroes); }
.filter-chip[data-filter="favorites"]  { --chip-color: var(--cat-favorites); }

/* Hover — subtle lift, no color fill */
.filter-chip:hover {
  border-color: var(--text-muted);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* Active — full color fill + glow (stays lit) */
.filter-chip.is-active {
  background: var(--chip-color);
  color: #fff;
  border-color: var(--chip-color);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--chip-color) 40%, transparent);
}
.filter-chip.is-active:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px color-mix(in srgb, var(--chip-color) 50%, transparent);
}

/* Fade indicators */
.filter-bar__fade {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 40px;
  pointer-events: none;
  z-index: 2;
  transition: opacity 0.3s var(--ease);
}
.filter-bar__fade--left { left: -8px; background: linear-gradient(to right, var(--bg), transparent); }
.filter-bar__fade--right { right: -8px; background: linear-gradient(to left, var(--bg), transparent); }
.filter-bar__fade.is-hidden { opacity: 0; }

/* Arrow nav */
.filter-bar__arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.2s var(--ease);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}
.filter-bar__arrow:hover { background: var(--text); color: var(--bg); border-color: var(--text); }
.filter-bar__arrow svg { width: 14px; height: 14px; }
.filter-bar__arrow--left { left: -14px; }
.filter-bar__arrow--right { right: -14px; }
.filter-bar__arrow.is-hidden { opacity: 0; pointer-events: none; }

.catalog-bar__count {
  text-align: center;
  font-size: 12px;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
  margin-top: 16px;
}
.catalog-bar__count span { color: var(--text-muted); font-weight: 600; }

/* ----------  Masonry Grid  ---------- */
.component-grid {
  column-count: 2;
  column-gap: var(--grid-gap);
}

/* ----------  Component Card  ---------- */
.component-card {
  break-inside: avoid;
  -webkit-column-break-inside: avoid;
  page-break-inside: avoid;
  margin-bottom: var(--grid-gap);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: visible; /* let glows escape */
  box-shadow: var(--shadow-card);
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              opacity 0.4s var(--ease);
}
.component-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
  border-color: var(--border-strong);
}
.component-card.is-entering { opacity: 0; transform: translateY(30px); }

.component-card__header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--bg);
  border-bottom: none;
  border-radius: var(--radius-card) var(--radius-card) 0 0;
}
.component-card__id {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
}
.component-card__name {
  flex: 1;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Category badge */
.component-card__badge {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
  color: #fff;
  background: var(--cat-all);
}
.component-card__badge[data-cat="buttons"]    { background: var(--cat-buttons); }
.component-card__badge[data-cat="cards"]      { background: var(--cat-cards); }
.component-card__badge[data-cat="loaders"]    { background: var(--cat-loaders); }
.component-card__badge[data-cat="forms"]      { background: var(--cat-forms); }
.component-card__badge[data-cat="navigation"] { background: var(--cat-navigation); }
.component-card__badge[data-cat="animations"] { background: var(--cat-animations); }
.component-card__badge[data-cat="headers"]    { background: var(--cat-headers); }
.component-card__badge[data-cat="heroes"]     { background: var(--cat-heroes); }

/* Replay button */
.component-card__replay {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--text-faint);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  transition: all 0.3s var(--ease);
}
.component-card__replay:hover {
  color: var(--cat-animations);
  background: color-mix(in srgb, var(--cat-animations) 12%, transparent);
  border-color: var(--cat-animations);
  transform: rotate(-180deg);
}
.component-card__replay svg { width: 14px; height: 14px; }

/* Favorite button */
.component-card__fav {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--text-faint);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  transition: all 0.2s var(--ease);
}
.component-card__fav:hover { color: var(--fav-color); border-color: var(--fav-color); transform: scale(1.1); }
.component-card__fav svg { width: 14px; height: 14px; fill: none; transition: fill 0.2s var(--ease); }
.component-card__fav.is-favorited { color: var(--fav-color); border-color: var(--fav-color); background: color-mix(in srgb, var(--fav-color) 10%, transparent); }
.component-card__fav.is-favorited svg { fill: var(--fav-color); }

/* ----------  Preview Area (no clipping, generous space)  ---------- */
.component-card__preview {
  background: var(--bg-elev-2);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: visible; /* no clipping — glow breathes */
  min-height: 320px;
  padding: 0;
}
.component-card[data-category="cards"] .component-card__preview { min-height: 380px; }
.component-card[data-category="heroes"] .component-card__preview { min-height: 380px; }
.component-card[data-category="headers"] .component-card__preview { min-height: 340px; }
.component-card[data-category="animations"] .component-card__preview { min-height: 340px; }

.component-card__preview iframe {
  width: 100%;
  min-height: 320px;
  border: none;
  background: transparent;
}

/* ----------  Action Bar  ---------- */
.component-card__actions {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: var(--bg);
  border-top: none;
  border-radius: 0 0 var(--radius-card) var(--radius-card);
}
.component-card__tabs { display: flex; gap: 4px; }

/* Tab buttons — colored, with glow on hover AND active */
.tab-btn {
  padding: 7px 16px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--bg-elev);
  border: 1.5px solid var(--border);
  border-radius: 6px;
  transition: all 0.3s var(--ease);
  --tab-color: var(--cat-all);
}
.tab-btn[data-tab="html"] { --tab-color: var(--cat-buttons); }
.tab-btn[data-tab="css"]  { --tab-color: var(--cat-cards); }
.tab-btn[data-tab="js"]   { --tab-color: var(--cat-loaders); }

.tab-btn:hover {
  color: var(--tab-color);
  border-color: var(--tab-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px color-mix(in srgb, var(--tab-color) 30%, transparent);
}

/* Active — subscribe-style fill: color fills, glow stays, slight lift */
.tab-btn[aria-expanded="true"] {
  color: #fff;
  background: var(--tab-color);
  border-color: var(--tab-color);
  transform: translateY(-3px);
  box-shadow: 0 0 0 1px var(--tab-color), 0 8px 24px color-mix(in srgb, var(--tab-color) 60%, transparent),
              0 0 20px color-mix(in srgb, var(--tab-color) 40%, transparent);
}

.component-card__tools {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.component-card__source {
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 500;
  color: var(--text-faint);
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  transition: all 0.2s var(--ease);
  white-space: nowrap;
  margin-right: 2px;
}
.component-card__source:hover { color: var(--text); border-color: var(--text-muted); background: var(--bg-elev); }

/* Download & Copy buttons — glow on hover AND active */
.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 7px 14px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text);
  background: var(--bg-elev);
  border: 1.5px solid var(--border);
  border-radius: 6px;
  transition: all 0.3s var(--ease);
  --tool-color: var(--cat-all);
}
.tool-btn--copy { --tool-color: var(--cat-forms); }
.tool-btn--download { --tool-color: var(--cat-navigation); }

.tool-btn:hover:not(:disabled) {
  color: var(--tool-color);
  border-color: var(--tool-color);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px color-mix(in srgb, var(--tool-color) 30%, transparent);
}
.tool-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.tool-btn svg { width: 14px; height: 14px; }

/* Active/clicked — subscribe-style fill: color fills, glow stays */
.tool-btn.is-copied,
.tool-btn.is-downloaded {
  color: #fff;
  background: var(--tool-color);
  border-color: var(--tool-color);
  transform: translateY(-3px);
  box-shadow: 0 0 0 1px var(--tool-color), 0 8px 24px color-mix(in srgb, var(--tool-color) 60%, transparent),
              0 0 20px color-mix(in srgb, var(--tool-color) 40%, transparent);
}

/* ----------  Code Dropdown  ---------- */
.component-card__dropdown {
  border-top: 1px solid var(--border);
  background: var(--bg);
  height: var(--dropdown-h);
  overflow: hidden;
  animation: dropdown-open 0.35s var(--ease);
  border-radius: 0 0 var(--radius-card) var(--radius-card);
}
@keyframes dropdown-open {
  from { opacity: 0; max-height: 0; }
  to   { opacity: 1; max-height: var(--dropdown-h); }
}
.component-card__dropdown[hidden] { display: none; }

.code-block {
  height: 100%;
  overflow-y: auto;
  background: var(--code-bg);
}
.code-block::-webkit-scrollbar { width: 8px; height: 8px; }
.code-block::-webkit-scrollbar-track { background: transparent; }
.code-block::-webkit-scrollbar-thumb { background: #333; border-radius: 4px; }
.code-block::-webkit-scrollbar-thumb:hover { background: #444; }

.code-pane {
  margin: 0;
  padding: 18px 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  color: var(--code-text);
  white-space: pre;
  tab-size: 2;
}
.code-pane[hidden] { display: none; }
.code-pane code { font-family: inherit; font-size: inherit; background: none; white-space: pre; }

/* ----------  Empty State  ---------- */
.empty-state {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 24px;
  text-align: center;
  color: var(--text-muted);
}
.empty-state.is-visible { display: flex; }
.empty-state__title { font-size: 18px; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.empty-state__text { font-size: 13px; max-width: 360px; }

/* ----------  Footer  ---------- */
.footer { border-top: 1px solid var(--border); padding: 32px var(--gutter); text-align: center; }
.footer p { font-size: 12px; color: var(--text-muted); margin-bottom: 4px; }
.footer p + p { color: var(--text-faint); font-size: 11px; }

/* ----------  Scroll Reveal  ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
  will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ----------  Reduced Motion  ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ----------  Responsive  ---------- */
@media (max-width: 768px) {
  :root { --gutter: 16px; --header-h: 52px; --dropdown-h: 340px; }
  .component-grid { column-count: 1; }
  .hero { padding: 56px var(--gutter) 44px; min-height: auto; }
  .hero__stats { gap: 36px; }
  .hero__stat-num { font-size: 28px; }
  .main { padding: 28px var(--gutter) 56px; }
  .component-card__preview { min-height: 260px; }
  .component-card[data-category="cards"] .component-card__preview,
  .component-card[data-category="heroes"] .component-card__preview { min-height: 300px; }
  .code-pane { padding: 14px 16px; font-size: 11px; }
  .tab-btn { padding: 6px 12px; font-size: 9px; }
  .tool-btn { padding: 6px 12px; }
  .component-card__source { display: none; }
  .site-header__center { font-size: 14px; }
  .site-header__stat { font-size: 12px; }
}

@media (max-width: 375px) {
  :root { --gutter: 12px; }
  .hero__title { font-size: 26px; }
  .hero__stats { gap: 28px; }
  .component-card__badge { display: none; }
  .component-card__header { padding: 10px 12px; gap: 6px; }
  .component-card__actions { padding: 6px 8px; gap: 4px; }
}