/* ============================================================
   Tactic-UX — shared stylesheet
   Used by index.html, community.html, development.html, experimental.html
   ============================================================ */

/* ============ TOKENS ============ */
:root{
  --bg:         #FAFAF9;
  --surface:    #F1F1EF;
  --card:       #FFFFFF;
  --ink:        #12130F;
  --ink-soft:   #5C5E57;
  --stone:      #93958C;
  --line:       #E4E4DF;
  --accent:     #3654FF;   /* electric indigo — interaction, links, status */
  --accent-soft:#EBEEFF;
  --accent-ink: #1F32B8;
  --live:       #1F8A5F;
  --live-soft:  #E6F4EC;

  --display: "Space Grotesk", -apple-system, sans-serif;
  --sans:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono:    "IBM Plex Mono", ui-monospace, monospace;

  --header-h: 72px;
  --radius:   14px;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  -webkit-font-smoothing:antialiased;
}
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; margin:0; padding:0; }

/* ============ STICKY HEADER ============ */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  height:var(--header-h);
  display:flex;
  align-items:center;
  background:rgba(250,250,249,0.88);
  backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  width:100%;
  max-width:1180px;
  margin:0 auto;
  padding:0 32px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}
.logo{
  display:flex;
  align-items:center;
  gap:11px;
  flex-shrink:0;
}
.logo-mark{
  width:32px; height:32px;
  border-radius:8px;
  background:var(--ink);
  display:flex;
  align-items:center;
  justify-content:center;
  flex-shrink:0;
}
.logo-word{
  font-family:var(--display);
  font-weight:600;
  font-size:16px;
  letter-spacing:-0.01em;
  color:var(--ink);
  line-height:1.1;
}
.logo-word span{
  display:block;
  font-family:var(--mono);
  font-weight:400;
  font-size:10px;
  letter-spacing:0.08em;
  text-transform:uppercase;
  color:var(--stone);
  margin-top:3px;
}

.site-nav{
  display:flex;
  align-items:center;
  gap:4px;
}
.nav-link{
  font-family:var(--sans);
  font-weight:500;
  font-size:13.5px;
  color:var(--ink-soft);
  padding:8px 13px;
  border-radius:8px;
  white-space:nowrap;
  transition:background 150ms ease, color 150ms ease;
}
.nav-link:hover{ background:var(--surface); color:var(--ink); }
.nav-link.is-active{ color:var(--ink); background:var(--surface); }

.nav-github{
  display:flex;
  align-items:center;
  justify-content:center;
  width:36px; height:36px;
  border-radius:8px;
  border:1px solid var(--line);
  margin-left:10px;
  flex-shrink:0;
  transition:border-color 150ms ease, background 150ms ease;
}
.nav-github:hover{ border-color:var(--ink); background:var(--surface); }

/* Hamburger toggle for narrow viewports */
.nav-toggle{
  display:none;
  width:36px; height:36px;
  border-radius:8px;
  border:1px solid var(--line);
  background:none;
  align-items:center;
  justify-content:center;
  flex-shrink:0;
  cursor:pointer;
}
.nav-toggle svg{ width:18px; height:18px; }

/* ============ INTRO ============ */
.index-intro{
  max-width:1180px;
  margin:0 auto;
  padding:76px 32px 44px;
}
.eyebrow{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:0.1em;
  text-transform:uppercase;
  color:var(--accent);
  margin:0 0 16px;
}
.index-intro h1{
  font-family:var(--display);
  font-weight:600;
  font-size:clamp(32px, 4.6vw, 50px);
  line-height:1.08;
  letter-spacing:-0.02em;
  margin:0 0 18px;
  max-width:760px;
}
.intro-copy{
  max-width:560px;
  font-size:16px;
  line-height:1.6;
  color:var(--ink-soft);
  margin:0;
}

/* ============ ACCORDION ============ */
.accordion{
  max-width:1180px;
  margin:0 auto 120px;
  padding:0 32px;
  display:flex;
  flex-direction:column;
  gap:12px;
}
.accordion-item{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow:hidden;
  scroll-margin-top:calc(var(--header-h) + 16px);
  transition:border-color 200ms ease, box-shadow 200ms ease;
}
.accordion-item.is-open{
  border-color:#D7DBEA;
  box-shadow:0 2px 24px rgba(18,19,15,0.05);
}

.accordion-trigger{
  width:100%;
  display:grid;
  grid-template-columns:36px 56px 1fr 96px 40px;
  align-items:center;
  gap:18px;
  padding:22px 28px;
  background:none;
  border:0;
  cursor:pointer;
  text-align:left;
  font:inherit;
  color:inherit;
}
.accordion-trigger:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:-2px;
  border-radius:10px;
}

.item-thumb{
  width:56px;
  height:56px;
  border-radius:9px;
  overflow:hidden;
  background:var(--surface);
  border:1px solid var(--line);
  flex-shrink:0;
}
.item-thumb svg{ width:100%; height:100%; display:block; }

.item-index{
  font-family:var(--mono);
  font-size:13px;
  color:var(--stone);
}
.item-titles{ min-width:0; }
.item-title{
  display:block;
  margin:0;
  font-family:var(--display);
  font-weight:600;
  font-size:clamp(18px, 2.2vw, 23px);
  letter-spacing:-0.01em;
  line-height:1.2;
  transition:color 180ms ease;
}
.accordion-trigger:hover .item-title{ color:var(--accent-ink); }
.item-meta{
  display:block;
  font-size:13px;
  color:var(--stone);
  margin-top:5px;
}

.status-pill{
  justify-self:end;
  font-family:var(--mono);
  font-size:10.5px;
  letter-spacing:0.04em;
  text-transform:uppercase;
  padding:5px 10px;
  border-radius:999px;
  white-space:nowrap;
}
.status-pill.live{ background:var(--live-soft); color:var(--live); }
.status-pill.prototype{ background:var(--accent-soft); color:var(--accent-ink); }
.status-pill.research{ background:var(--surface); color:var(--ink-soft); }

/* plus / minus toggle inside a circular button */
.toggle-icon{
  position:relative;
  width:32px;
  height:32px;
  border-radius:50%;
  background:var(--surface);
  justify-self:end;
  flex-shrink:0;
  transition:background 200ms ease;
}
.toggle-icon::before,
.toggle-icon::after{
  content:"";
  position:absolute;
  top:50%; left:50%;
  background:var(--ink);
  transform-origin:center;
  border-radius:1px;
}
.toggle-icon::before{
  width:12px; height:1.6px;
  transform:translate(-50%,-50%);
}
.toggle-icon::after{
  width:1.6px; height:12px;
  transform:translate(-50%,-50%) rotate(0deg);
  transition:transform 260ms cubic-bezier(.65,0,.35,1), opacity 260ms ease;
}
.accordion-item.is-open .toggle-icon{ background:var(--accent); }
.accordion-item.is-open .toggle-icon::before,
.accordion-item.is-open .toggle-icon::after{ background:#fff; }
.accordion-item.is-open .toggle-icon::after{
  transform:translate(-50%,-50%) rotate(90deg);
  opacity:0;
}

/* panel: grid-rows trick for smooth height animation */
.accordion-panel{
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows 380ms cubic-bezier(.65,0,.35,1);
}
.accordion-item.is-open .accordion-panel{ grid-template-rows:1fr; }
.panel-inner-wrap{ overflow:hidden; }
.panel-inner{
  display:grid;
  grid-template-columns:1.1fr 1fr;
  gap:36px;
  padding:28px 28px 32px 28px;
  border-top:1px solid var(--line);
  margin-top:2px;
}

.panel-media{ display:flex; flex-direction:column; gap:14px; }
.media-frame{
  border:1px solid var(--line);
  background:var(--surface);
  border-radius:10px;
  overflow:hidden;
  aspect-ratio:4/3;
  display:flex;
  align-items:center;
  justify-content:center;
}
.media-frame svg{ width:100%; height:100%; }
.media-caption{
  font-family:var(--mono);
  font-size:11px;
  color:var(--stone);
}

.video-frame{
  border:1px solid var(--line);
  background:var(--ink);
  border-radius:10px;
  aspect-ratio:16/9;
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  color:#fff;
}
.video-frame .play-btn{
  width:50px; height:50px;
  border-radius:50%;
  background:var(--accent);
  display:flex; align-items:center; justify-content:center;
}
.video-frame .play-btn::before{
  content:"";
  border-style:solid;
  border-width:8px 0 8px 13px;
  border-color:transparent transparent transparent #fff;
  margin-left:3px;
}
.video-frame .video-label{
  position:absolute;
  bottom:14px; left:16px;
  font-family:var(--mono);
  font-size:11px;
  color:rgba(255,255,255,0.75);
}
.video-frame iframe{ width:100%; height:100%; border:0; }

.panel-body p{
  font-size:15px;
  line-height:1.65;
  color:var(--ink-soft);
  margin:0 0 20px;
}
.field-list{
  display:grid;
  grid-template-columns:auto 1fr;
  row-gap:9px;
  column-gap:16px;
  margin:0 0 22px;
  font-size:13px;
}
.field-list dt{
  font-family:var(--mono);
  color:var(--stone);
  text-transform:uppercase;
  font-size:10.5px;
  letter-spacing:0.04em;
  padding-top:2px;
}
.field-list dd{ margin:0; color:var(--ink); }

.link-row{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-bottom:20px;
}
.repo-link{
  display:inline-flex;
  align-items:center;
  gap:7px;
  font-family:var(--mono);
  font-size:12px;
  color:var(--ink);
  background:var(--surface);
  border:1px solid var(--line);
  padding:7px 12px;
  border-radius:8px;
  transition:border-color 150ms ease, color 150ms ease;
}
.repo-link:hover{ border-color:var(--accent); color:var(--accent-ink); }
.repo-link svg{ width:13px; height:13px; flex-shrink:0; }

.tag-list{ display:flex; flex-wrap:wrap; gap:8px; }
.tag-list li{
  font-family:var(--mono);
  font-size:11px;
  color:var(--accent-ink);
  background:var(--accent-soft);
  padding:5px 10px;
  border-radius:999px;
}

/* ============ EMPTY-SILO PLACEHOLDER ============ */
.empty-note{
  max-width:1180px;
  margin:0 auto 100px;
  padding:0 32px;
}
.empty-note p{
  border:1px dashed var(--line);
  border-radius:var(--radius);
  padding:22px 24px;
  font-size:13.5px;
  color:var(--stone);
  font-family:var(--mono);
  margin:0;
}

/* ============ IA / UX GALLERY ============ */
.panel-gallery{
  grid-column:1 / -1;
  border-top:1px solid var(--line);
  margin-top:8px;
  padding-top:26px;
}
.panel-gallery-label{
  font-family:var(--mono);
  font-size:11px;
  letter-spacing:0.06em;
  text-transform:uppercase;
  color:var(--stone);
  margin:0 0 16px;
}
.ia-gallery{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:18px;
  margin:0;
  padding:0;
  list-style:none;
}
.ia-gallery-item{
  display:flex;
  flex-direction:column;
  gap:8px;
}
.ia-gallery-trigger{
  display:block;
  width:100%;
  padding:0;
  border:1px solid var(--line);
  border-radius:10px;
  background:var(--surface);
  overflow:hidden;
  cursor:pointer;
  aspect-ratio:4/3;
  transition:border-color 150ms ease, transform 150ms ease;
}
.ia-gallery-trigger:hover{ border-color:var(--accent); }
.ia-gallery-trigger:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
}
.ia-gallery-trigger svg{ width:100%; height:100%; display:block; }
.ia-gallery-caption{
  font-size:12.5px;
  line-height:1.4;
  color:var(--ink-soft);
  margin:0;
}

/* Full-size version lives in a <template> and is never rendered directly */
.ia-gallery-full{ display:none; }

/* ============ LIGHTBOX ============ */
.lightbox-overlay{
  position:fixed;
  inset:0;
  z-index:200;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:40px 24px;
  background:rgba(18,19,15,0.86);
  opacity:0;
  visibility:hidden;
  transition:opacity 200ms ease;
}
.lightbox-overlay.is-open{
  opacity:1;
  visibility:visible;
}
.lightbox-inner{
  position:relative;
  width:100%;
  max-width:860px;
  background:var(--card);
  border-radius:14px;
  padding:28px;
}
.lightbox-media{
  width:100%;
  aspect-ratio:4/3;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:10px;
  overflow:hidden;
  display:flex;
  align-items:center;
  justify-content:center;
}
.lightbox-media svg{ width:100%; height:100%; display:block; }
.lightbox-footer{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  margin-top:18px;
}
.lightbox-caption{
  font-size:14px;
  color:var(--ink-soft);
  margin:0;
}
.lightbox-count{
  font-family:var(--mono);
  font-size:11.5px;
  color:var(--stone);
  white-space:nowrap;
}
.lightbox-close,
.lightbox-nav-btn{
  position:absolute;
  width:38px; height:38px;
  border-radius:50%;
  border:1px solid var(--line);
  background:var(--card);
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  transition:border-color 150ms ease, background 150ms ease;
}
.lightbox-close:hover,
.lightbox-nav-btn:hover{ border-color:var(--accent); background:var(--surface); }
.lightbox-close{ top:-14px; right:-14px; }
.lightbox-prev{ top:50%; left:-16px; transform:translateY(-50%); }
.lightbox-next{ top:50%; right:-16px; transform:translateY(-50%); }
.lightbox-close svg,
.lightbox-nav-btn svg{ width:14px; height:14px; }

@media (max-width:900px){
  .ia-gallery{ grid-template-columns:repeat(2, 1fr); }
  .lightbox-inner{ padding:20px; }
  .lightbox-prev{ left:-10px; }
  .lightbox-next{ right:-10px; }
}
@media (max-width:520px){
  .ia-gallery{ grid-template-columns:1fr; }
}

/* ============ FOOTER ============ */
.site-footer{
  border-top:1px solid var(--line);
  padding:26px 32px 60px;
}
.site-footer p{
  max-width:1180px;
  margin:0 auto;
  font-family:var(--mono);
  font-size:11px;
  color:var(--stone);
}

/* ============ RESPONSIVE ============ */
@media (max-width:900px){
  .header-inner{ padding:0 20px; }
  .logo-word span{ display:none; }

  .site-nav{
    position:fixed;
    top:var(--header-h);
    left:0; right:0;
    background:var(--bg);
    border-bottom:1px solid var(--line);
    flex-direction:column;
    align-items:stretch;
    gap:2px;
    padding:10px 20px 16px;
    transform:translateY(-8px);
    opacity:0;
    pointer-events:none;
    transition:opacity 160ms ease, transform 160ms ease;
  }
  .site-nav.is-open{
    opacity:1;
    transform:translateY(0);
    pointer-events:auto;
  }
  .nav-link{ padding:12px 14px; }
  .nav-github{ margin:6px 0 0; align-self:flex-start; }
  .nav-toggle{ display:flex; }

  .index-intro{ padding:52px 20px 32px; }
  .accordion{ padding:0 20px; }
  .accordion-trigger{
    grid-template-columns:44px 1fr 32px;
    gap:12px;
    padding:18px;
  }
  .item-index{ display:none; }
  .status-pill{ display:none; }
  .panel-inner{
    grid-template-columns:1fr;
    padding:20px 18px 26px;
    gap:24px;
  }
}

@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  .accordion-panel, .toggle-icon::after, .site-nav{ transition:none; }
}