/* filename: app.css */
/* Athena · Purple Aurora — Full-Screen, Readability & Spacing Perfected
   Selector mapping / notes:
   - Preserves all original IDs/classes for JS.
   - Spacing fixes: compact TTL pill, aligned safety row, consistent card paddings, balanced gaps.
   - Chat container is height‑constrained with an internal scrollbar on all viewports; page no longer grows.
*/

/* =========================
   Tokens (fluid sizes)
   ========================= */
:root{
  --bg:#0a0513; --panel:#110a26; --elev:#0f0922;
  --fg:#f6f3ff; --muted:#b8b0d2; --subtle:#20153a;

  --accent:#cfa9ff; --accent-2:#8b5cf6; --berry:#e879f9;

  --warn:#fbbf24; --danger:#fb7185;

  --line:rgba(213,166,255,.28);
  --radius:16px; --radius-sm:12px;
  --shadow-1:0 22px 60px rgba(0,0,0,.62);
  --shadow-2:0 8px 22px rgba(0,0,0,.45);
  --ring:0 0 0 3px rgba(207,169,255,.38);

  /* Fluid typography */
  --fs-xs: clamp(12px, 0.25vw + 11px, 14px);
  --fs-sm: clamp(13px, 0.35vw + 12px, 16px);
  --fs-base: clamp(15.5px, 0.55vw + 12px, 20px);
  --fs-lg: clamp(18px, 0.7vw + 14px, 24px);
  --fs-xl: clamp(22px, 1vw + 16px, 28px);

  /* Layout */
  --container-pad: clamp(12px, 2vw, 28px);
  --rail-w: clamp(240px, 24vw, 380px);
  --gap: clamp(12px, 1.2vw, 20px);

  /* Controls */
  --control-h: clamp(44px, 1.4vw + 40px, 56px);
  --btn-pad-y: clamp(10px, 0.5vw + 8px, 14px);
  --btn-pad-x: clamp(14px, 0.8vw + 10px, 22px);
}

/* =========================
   Base & background
   ========================= */
*{ box-sizing:border-box; }
html,body{ height:100%; }
html{ color-scheme: dark; }
body{
  margin:0;
  background:
    radial-gradient(1300px 700px at 12% -10%, rgba(139,92,246,.25), transparent 60%),
    radial-gradient(1100px 650px at 88% -10%, rgba(217,70,239,.18), transparent 65%),
    radial-gradient(1200px 700px at 50% 120%, rgba(124,58,237,.16), transparent 65%),
    linear-gradient(180deg, #090414 0%, var(--bg) 40%, #0b0615 65%, #090414 100%);
  color:var(--fg);
  font: 400 var(--fs-base)/1.7 system-ui,-apple-system,"Segoe UI",Roboto,Ubuntu,Cantarell,"Helvetica Neue",Arial,"Noto Sans","Apple Color Emoji","Segoe UI Emoji";
  -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
  /* Prevent page-level scrolling; chat uses an internal scroller */
  overflow:hidden;
}
body::after{
  content:""; position:fixed; inset:0; pointer-events:none;
  background:
    linear-gradient(transparent 31px, rgba(124,58,237,.08) 32px),
    linear-gradient(90deg, transparent 31px, rgba(124,58,237,.08) 32px);
  background-size:32px 32px;
  mask: radial-gradient(70% 70% at 50% 0%, rgba(255,255,255,.7), transparent 75%);
  mix-blend-mode:soft-light; opacity:.55;
}

/* Ambient layers */
.aurora{ position:fixed; inset:-20% -10%; z-index:-2; pointer-events:none; filter: blur(48px) saturate(115%) }
.aurora::before,.aurora::after{ content:""; position:absolute; inset:0; mix-blend-mode:screen }
.aurora::before{
  background:
    radial-gradient(40% 70% at 20% 10%, rgba(168,85,247,.35), transparent 60%),
    radial-gradient(55% 85% at 80% 5%, rgba(217,70,239,.25), transparent 60%),
    radial-gradient(40% 80% at 55% 95%, rgba(99,102,241,.20), transparent 65%);
  animation: driftA 26s ease-in-out infinite alternate;
}
.aurora::after{
  background:
    radial-gradient(35% 65% at 25% 15%, rgba(192,132,252,.35), transparent 60%),
    radial-gradient(45% 75% at 82% 12%, rgba(139,92,246,.28), transparent 60%),
    radial-gradient(50% 85% at 60% 100%, rgba(236,72,153,.18), transparent 65%);
  animation: driftB 32s ease-in-out infinite alternate;
}
.grain{
  position:fixed; inset:-1px; z-index:-1; pointer-events:none;
  background:
    radial-gradient(1px 1px at 12px 18px, rgba(255,255,255,.06), transparent 60%),
    radial-gradient(1px 1px at 38px 42px, rgba(255,255,255,.04), transparent 60%);
  background-size:64px 64px,64px 64px;
  mix-blend-mode:soft-light; opacity:.5;
}
@keyframes driftA{ from{transform:translate3d(-2%,-1%,0) rotate(-1.5deg) scale(1.02)} to{transform:translate3d(2%,3%,0) rotate(1.5deg) scale(1.05)} }
@keyframes driftB{ from{transform:translate3d(1%,-2%,0) rotate(1deg) scale(1.03)} to{transform:translate3d(-3%,2%,0) rotate(-1deg) scale(1.06)} }
@media (prefers-reduced-motion:reduce){ .aurora::before,.aurora::after{ animation:none } }

/* =========================
   Shell layout — fixed to viewport, internal scroll only
   ========================= */
.container{
  inline-size:100%; max-inline-size:100%;
  padding: var(--container-pad);
  display:grid; gap: var(--gap);
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  grid-template-rows: auto minmax(0,1fr) auto; /* header | main | footer */
  block-size: 100svh; /* fallback for older mobile */
  overflow:hidden;    /* never let page gain a scrollbar */
}
@supports(height: 100dvh){ .container{ block-size: 100dvh; } }

/* Rail (left) */
.app-header{
  grid-column: 1;
  grid-row: 1 / 3; /* span header + main rows */
  position:sticky; top:var(--container-pad); align-self:start;
  display:flex; flex-direction:column;
  gap: clamp(10px, 0.9vw, 16px);
}
.brand{ margin:0; font-weight:800; font-size: var(--fs-xl); letter-spacing:.2px; }
.brand a{ color:#fcfaff; text-decoration:none; display:inline-flex; align-items:center; gap:12px; filter: drop-shadow(0 4px 12px rgba(207,169,255,.45)); }
.brand .brand-mark{ width: clamp(28px, 1.3vw + 22px, 42px); height:auto; flex:0 0 auto }

/* TTL pill — compact, no over‑stretching, tidy spacing */
.ttl{
  display:inline-flex; align-items:center; gap:12px; flex-wrap:nowrap;
  border-radius:22px; padding:8px 12px;
  border:1px solid rgba(213,166,255,.5);
  background: linear-gradient(180deg, rgba(28,16,56,.9), rgba(18,12,38,.9));
  box-shadow: var(--shadow-2);
  white-space:nowrap; /* keep in one line so it remains a compact pill */
  max-inline-size: 100%;
}
.ttl-label{ color:var(--muted); font-size: var(--fs-sm); }
.ttl-count{ font-size: var(--fs-base); letter-spacing:.03em; font-variant-numeric: tabular-nums; }
.ttl-extend{ margin-inline-start: 4px; } /* no auto-margin so pill doesn't fill entire rail */
.ttl.warn{ border-color: rgba(251,191,36,.75); box-shadow: 0 0 0 3px rgba(251,191,36,.18); }

/* Safety row — aligned label/value with consistent gaps */
.safety{
  display:grid; grid-template-columns: max-content 1fr;
  gap: 6px 12px; align-items:center;
}
.safety-code{
  background: rgba(18,10,36,.86); border:1px solid rgba(213,166,255,.5);
  padding:6px 10px; border-radius:12px; color:#eadbff;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: var(--fs-base); line-height:1.2; letter-spacing:.04em; font-variant-numeric: tabular-nums;
}

/* Rail helper card */
.rail-card{
  background: linear-gradient(180deg, rgba(28,16,56,.6), rgba(18,12,38,.6));
  border:1px solid var(--line); border-radius:var(--radius);
  padding: clamp(10px, 1vw, 16px); box-shadow:var(--shadow-2);
}
.rail-hint{ margin:0; font-size: var(--fs-sm); }

/* Main column fills remaining space between header & footer */
.main{
  grid-column: 2 / -1;
  grid-row: 1 / 3; /* occupy the same vertical band as header */
  display:grid;
  grid-template-rows: auto minmax(0, 1fr); /* intro + chat */
  min-block-size: 0;
  overflow:hidden; /* prevent panel from growing the page */
}
.footer{
  grid-column: 1 / -1;
  grid-row: 3;
  margin-top: clamp(8px, 1.2vw, 18px);
}
.footer small{ font-size: var(--fs-sm); }

/* =========================
   Panels / cards (even paddings)
   ========================= */
.panel{
  position:relative; overflow:hidden; isolation:isolate;
  background: linear-gradient(180deg, rgba(22,12,42,.78), rgba(14,8,28,.78)) padding-box;
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding: clamp(14px, 1.6vw, 22px);
  box-shadow: var(--shadow-1);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
}
.panel::before{
  content:""; position:absolute; inset:-1px; border-radius:inherit; pointer-events:none;
  background: linear-gradient(180deg, rgba(207,169,255,.45), rgba(139,92,246,.28) 40%, rgba(124,58,237,.12) 80%);
  padding:1px;
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor; mask-composite: exclude; opacity:.95;
}
.panel::after{
  content:""; position:absolute; inset:0; border-radius:inherit; pointer-events:none;
  background: linear-gradient(180deg, rgba(255,255,255,.06), transparent 35%); mix-blend-mode:soft-light;
}
.intro .actions{ margin: 10px 0 12px; }

/* =========================
   Buttons
   ========================= */
.btn{
  appearance:none; border:0; border-radius:14px;
  padding: var(--btn-pad-y) var(--btn-pad-x);
  font-weight:700; cursor:pointer;
  transition: transform .15s ease, filter .15s ease, box-shadow .15s ease;
  font-size: var(--fs-base);
}
.btn-primary{
  background:
    radial-gradient(120% 180% at 30% -30%, rgba(255,255,255,.35), transparent 40%),
    linear-gradient(90deg, var(--accent), var(--accent-2) 60%, var(--berry));
  color:#11071f; text-shadow: 0 1px 0 rgba(255,255,255,.25);
  box-shadow: 0 12px 32px rgba(139,92,246,.35), inset 0 1px 0 rgba(255,255,255,.25);
}
.btn-primary:hover{ filter: brightness(1.07); transform: translateY(-1px); }
.btn-ghost{ background: rgba(207,169,255,.16); color:var(--fg); border:1px solid rgba(207,169,255,.45); }
.btn-ghost:hover{ background: rgba(207,169,255,.22); transform: translateY(-1px); }
.btn:focus-visible{ outline:none; box-shadow: var(--ring); }
.btn[disabled]{ opacity:.6; cursor:not-allowed; transform:none !important; }

/* Info button (ALWAYS visible; if older CSS hid it on desktop, override here) */
.brand-row{ display:flex; align-items:center; justify-content:space-between; gap:8px; }
#btn-info{ display:inline-flex; align-items:center; justify-content:center; }
.info-button{
  inline-size: 40px; block-size: 40px; border-radius:12px; padding:0;
  font-weight:800; font-size: 22px; line-height:1;
}

/* =========================
   Inputs
   ========================= */
.input{
  width:100%; padding: clamp(12px, 0.6vw + 10px, 16px) clamp(14px, 0.8vw + 10px, 22px);
  border-radius:14px; background: rgba(18,10,36,.86); color:var(--fg);
  border:1px solid rgba(213,166,255,.34);
  outline: none; transition: .15s ease;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,.35);
  font-size: var(--fs-base);
}
.input::placeholder{ color:#968fb0; }
.input:focus{ border-color: var(--accent); box-shadow: var(--ring); }

/* Icon button for attach */
.icon-button{
  display:inline-flex; align-items:center; justify-content:center;
  inline-size: var(--control-h); block-size: var(--control-h);
  border-radius:16px; background: rgba(18,10,36,.86);
  border:1px dashed rgba(213,166,255,.45);
  cursor:pointer; user-select:none; transition:.15s ease;
  font-size: var(--fs-lg);
}
.icon-button:hover{ border-color: var(--accent); }
.icon-button:focus-visible{ outline:none; box-shadow: var(--ring); }

/* =========================
   Chat — strictly contained, internal scroll
   ========================= */
.chat{
  position:relative;
  display:flex; flex-direction:column;
  min-height:0;            /* allow the grid to clamp height */
  flex:1 1 auto;
  min-block-size: clamp(320px, 60vh, 640px);
  overflow:hidden;         /* prevent the panel from growing the page */
}
.messages{
  list-style:none; margin:0; padding:0;
  display:flex; flex-direction:column; gap: clamp(10px, 0.6vw, 18px);
  flex:1 1 auto; min-height:0; overflow:auto; scroll-behavior:smooth;
  overscroll-behavior: contain;
  scroll-padding-bottom: 12px;
  block-size:100%; /* fill available height inside chat */
}
.messages::-webkit-scrollbar{ width:12px; }
.messages::-webkit-scrollbar-thumb{ background:#201538; border-radius:10px; }
.messages::-webkit-scrollbar-track{ background: transparent; }

.msg{
  background: linear-gradient(180deg, rgba(28,16,56,.95), rgba(18,12,38,.95));
  border:1px solid rgba(213,166,255,.28);
  border-radius: clamp(16px, 0.6vw + 12px, 22px);
  padding: clamp(12px, 0.6vw + 10px, 18px) clamp(14px, 0.8vw + 10px, 22px);
  box-shadow: 0 8px 22px rgba(0,0,0,.5);
  position:relative; max-width: min(78ch, 94%); font-size: var(--fs-base);
}
.msg .hdr{ color:var(--muted); font-size: var(--fs-sm); }
.msg .txt{ white-space: pre-wrap; word-break: break-word; margin-top:6px; }
.msg time{ display:block; margin-top:8px; font-size: var(--fs-xs); color:#9aa0b3; }
.msg::before{
  content:""; position:absolute; top:-1px; left:12px; right:12px; height:2px;
  background: linear-gradient(90deg, transparent, rgba(207,169,255,.7), transparent); opacity:.6;
}
.msg.me{
  margin-left:auto; background: linear-gradient(180deg, rgba(207,169,255,.22), rgba(139,92,246,.18));
  border-color: rgba(207,169,255,.55);
}
.msg.system{
  align-self:center; text-align:center; max-width: 60%;
  background: rgba(255,255,255,.03);
  border-style:dashed; border-color: rgba(213,166,255,.35);
}

/* Composer */
.composer{
  position:relative;
  display:grid; gap: clamp(10px, 0.8vw, 18px); margin-top:12px; align-items:center;
  grid-template-columns: minmax(160px, clamp(240px, 20vw, 360px)) 1fr auto auto auto;
}
.composer .name{ grid-column:1 / 2; }
.composer .message{ grid-column:2 / 3; }
.composer .emoji{ grid-column:3 / 4; }
.composer .attach{ grid-column:4 / 5; }
.composer .send{ grid-column:5 / 6; }
.composer #emoji-panel{ grid-column: 1 / -1; }

.icon-button.emoji{
  font-size: var(--fs-base);
}

.emoji-panel{
  position:absolute; right:0; bottom: calc(100% + 10px);
  inline-size: min(560px, calc(100vw - 32px));
  max-block-size: min(640px, 80vh);
  border-radius:16px;
  background: rgba(18,10,36,.97);
  border:1px solid rgba(213,166,255,.35);
  box-shadow: var(--shadow-2);
  display:grid;
  grid-template-rows: auto auto 1fr auto;
  overflow:hidden;
  z-index:5;
}


.emoji-autocomplete{
  position:absolute;
  top:0;
  left:0;
  padding:6px;
  display:flex;
  flex-direction:column;
  gap:4px;
  border-radius:12px;
  background: rgba(18,10,36,.97);
  border:1px solid rgba(213,166,255,.32);
  box-shadow: var(--shadow-2);
  min-inline-size: clamp(180px, 22vw, 320px);
  max-inline-size: clamp(240px, 28vw, 360px);
  max-block-size: min(320px, 50vh);
  overflow:auto;
  z-index:6;
}

.emoji-autocomplete .item{
  display:flex;
  align-items:center;
  gap:10px;
  padding:8px 10px;
  border-radius:10px;
  background: transparent;
  border:none;
  color:var(--fg);
  font-size: var(--fs-sm);
  text-align:left;
  cursor:pointer;
  transition: background .12s ease, box-shadow .12s ease;
}

.emoji-autocomplete .item .preview{
  display:flex;
  align-items:center;
  justify-content:center;
  inline-size:28px;
  block-size:28px;
  border-radius:8px;
  background: rgba(32,20,70,.6);
  font-size:22px;
}

.emoji-autocomplete .item img{
  inline-size:28px;
  block-size:28px;
  border-radius:8px;
  object-fit:contain;
}

.emoji-autocomplete .item .text{
  display:flex;
  flex-direction:column;
  gap:2px;
}

.emoji-autocomplete .item .alias{
  font-weight:600;
}

.emoji-autocomplete .item .meta{
  font-size: var(--fs-xs);
  color:#9aa0b3;
}

.emoji-autocomplete .item.active,
.emoji-autocomplete .item:hover,
.emoji-autocomplete .item:focus{
  background: rgba(40,20,70,.85);
  box-shadow: 0 0 0 1px rgba(207,169,255,.35);
}

.emoji-panel.hidden,
.emoji-autocomplete.hidden{ display:none !important; }

.emoji-panel-search{
  padding:10px 12px;
  border-bottom:1px solid rgba(213,166,255,.25);
}

.emoji-panel-search input{
  inline-size:100%;
  padding:8px 10px;
  border-radius:12px;
  border:1px solid rgba(213,166,255,.35);
  background: rgba(14,8,28,.92);
  color: var(--fg);
  font-size: var(--fs-sm);
}


.emoji-panel-tabs{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap:10px;
  padding:12px 16px;
  border-bottom:1px solid rgba(213,166,255,.25);
  max-height: 196px;
  overflow:auto;
}

.emoji-panel-tabs .emoji-tab{
  display:flex;
  align-items:center;
  justify-content:flex-start;
  gap:12px;
  width:100%;
  padding:12px 16px;
  border-radius:12px;
  border:1px solid transparent;
  background: rgba(24,14,44,.9);
  color: var(--fg);
  font-size: clamp(0.75rem, 1.5vw, var(--fs-sm));
  line-height:1.2;
  cursor:pointer;
  transition:.15s ease;
  min-inline-size:0;
  text-align:left;
}

.emoji-tab-icon{
  font-size:1.25em;
  flex:0 0 auto;
}

.emoji-tab-label{
  flex:1 1 auto;
  min-inline-size:0;
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}

.emoji-panel-tabs .emoji-tab.active{
  border-color: var(--accent);
  background: rgba(40,20,70,.95);
}

.emoji-panel-tabs .emoji-tab:focus-visible{
  outline:none;
  box-shadow: var(--ring);
}

.emoji-panel-grid{
  padding:12px 16px 6px;
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(44px, 1fr));
  gap:8px;
  overflow:auto;
}

.emoji-item{
  display:flex;
  align-items:center;
  justify-content:center;
  block-size:44px;
  border-radius:12px;
  border:1px solid transparent;
  background: rgba(24,14,44,.9);
  cursor:pointer;
  transition:.15s ease;
  font-size: 24px;
}

.emoji-item[data-type="custom"]{
  padding:4px;
}

.emoji-item img{
  display:block;
  max-inline-size:100%;
  max-block-size:100%;
  border-radius:10px;
}

.custom-emoji{
  display:inline-block;
  width:1.95em;
  height:1.95em;
  vertical-align:-0.35em;
  object-fit:contain;
  margin-inline:0.05em;
}

.emoji-item:hover,
.emoji-item:focus-visible{
  border-color: var(--accent);
  outline:none;
  background: rgba(40,20,70,.9);
  box-shadow: var(--ring);
}

.emoji-panel-footer{
  padding:10px 16px 14px;
  border-top:1px solid rgba(213,166,255,.25);
  display:flex;
  flex-direction:column;
  gap:4px;
  font-size: var(--fs-xs);
  color: var(--muted);
}

.emoji-preview{
  font-size: var(--fs-sm);
  color: var(--fg);
  height: 1.8em;
  display:flex;
  align-items:center;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}

.emoji-preview strong{
  font-weight:600;
}

.emoji-panel-footer .tip{
  line-height:1.3;
}

.emoji-native{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  font-size:1.5em;
  line-height:1;
  vertical-align:-0.25em;
  margin-inline:0.05em;
}

@media (max-width: 720px){
  .emoji-panel{
    inline-size: min(480px, calc(100vw - 28px));
    max-block-size: min(600px, 78vh);
  }
  .emoji-panel-tabs{
    grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  }
}

@media (max-width: 560px){
  .emoji-panel{
    inline-size: min(380px, calc(100vw - 24px));
    max-block-size: min(540px, 80vh);
  }
  .emoji-panel-tabs{
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  }
}

@media (max-width: 440px){
  .emoji-panel-tabs{
    grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
  }
  .emoji-panel-tabs .emoji-tab{
    justify-content:center;
    padding-inline:10px;
  }
  .emoji-panel-tabs .emoji-tab .emoji-tab-label{
    display:none;
  }
}

/* Files */
.files{ display:grid; grid-template-columns: 1fr; gap:12px; }
.file-tile{
  border:1px solid rgba(213,166,255,.3);
  border-radius:14px; padding: clamp(10px, 0.6vw + 8px, 16px);
  background: rgba(18,10,36,.86); box-shadow:var(--shadow-2);
  font-size: var(--fs-base);
}
.file-tile .name{ font-weight:700; }
.file-tile .meta{ color:var(--muted); font-size: var(--fs-sm); margin-top:4px; }
.file-tile .bar{ position:relative; height:10px; border-radius:999px; background:#251a45; margin-top:10px; overflow:hidden }
.file-tile .bar > i{ position:absolute; inset:0; width:0%; background: linear-gradient(90deg, var(--accent), var(--accent-2)) }
.file-tile .actions{ margin-top:10px; display:flex; gap:12px; align-items:center; font-size: var(--fs-sm) }
.file-tile .actions a{ color:var(--accent); text-decoration:none }
.file-tile .preview{ margin-top:10px }
.file-tile .preview img,
.file-tile .preview video{ max-inline-size:100%; border-radius:12px; display:block }
.file-tile .preview audio{ inline-size:100% }
.preview pre.text-preview{
  margin:0;
  padding:12px;
  background: rgba(27,17,48,.85);
  border:1px solid var(--line);
  border-radius:12px;
  max-block-size:240px;
  overflow:auto;
  font: 500 var(--fs-sm)/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space:pre-wrap;
  word-break:break-word;
}

/* Notices */
.notice{
  background: rgba(207,169,255,.12);
  border-left: 3px solid var(--accent);
  padding: clamp(8px, 0.6vw + 6px, 14px) clamp(10px, 0.8vw + 8px, 18px);
  border-radius: 12px; color:var(--fg); font-size: var(--fs-base);
}

/* Drop zone */
.dropzone{
  position:absolute; inset:8px;
  border:2px dashed rgba(213,166,255,.45);
  border-radius: var(--radius);
  display:grid; place-items:center; color:var(--muted);
  background: rgba(8,6,20,.5);
  pointer-events:none; z-index:2; transition:.15s ease;
  font-size: var(--fs-lg);
}
.dropzone.show{ border-color: var(--accent); color: var(--fg); background: rgba(8,6,20,.68); }

/* New messages pill (bottom-center overlay) */
.new-indicator{
  position:absolute; inset:auto 0 12px 0; margin-inline:auto;
  display:none; align-items:center; justify-content:center;
  gap:8px; padding:8px 12px; border-radius:999px;
  background: rgba(28,16,56,.92); color:var(--fg);
  border:1px solid rgba(213,166,255,.5);
  box-shadow: var(--shadow-2);
  width:max-content; cursor:pointer; z-index:3;
  font-size: var(--fs-sm);
}
.new-indicator.show{ display:inline-flex; }
.new-indicator:focus-visible{ outline:none; box-shadow: var(--ring); }

/* Utils & a11y */
.hidden{ display:none !important; }
.muted{ color:var(--muted); }
.sr-only{
  position:absolute !important; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0;
}
code{ background: rgba(18,10,36,.86); padding:2px 8px; border-radius:8px; border:1px solid rgba(213,166,255,.4); color:#f4eafe; font-size: var(--fs-sm); }

/* Skip link */
.skip-link{
  position:absolute; left:-9999px; top:-9999px;
}
.skip-link:focus{
  position:static; margin:8px var(--container-pad); display:inline-block; padding:10px 12px;
  border-radius:12px; background:#1b0f34; border:1px solid rgba(213,166,255,.45); box-shadow:var(--ring);
  font-size: var(--fs-base);
}

/* =========================
   Responsiveness
   ========================= */
@media (max-width: 1100px){
  /* Avoid TTL pill crowding; push button to a new row when narrow */
  .ttl{ flex-wrap: wrap; gap:8px 10px; }
  .ttl-extend{ order:2; flex-basis: 100%; margin-inline-start: 0; }
}

@media (max-width: 980px){
  .container{
    grid-template-columns: 1fr;
    grid-template-rows: auto minmax(0,1fr) auto;
  }
  .app-header{
    position:static;
    grid-column: 1 / -1;
    grid-row: 1;
  }
  .main{
    grid-column: 1 / -1;
    grid-row: 2;
  }
  .footer{
    grid-column: 1 / -1;
    grid-row: 3;
  }
}
/* Narrow desktop (641–820): prevent composer control overlap */
@media (max-width: 820px) and (min-width: 641px){
  .composer{ grid-template-columns: 1fr auto auto auto; }
  .composer .name{ grid-column: 1 / -1; }
  .composer .message{ grid-column: 1 / 2; }
  .composer .emoji{ grid-column: 2 / 3; }
  .composer .attach{ grid-column: 3 / 4; }
  .composer .send{ grid-column: 4 / 5; }
}

@media (max-width: 640px){
  .panel{ padding:12px; }
  .messages{ gap:10px; padding-bottom: calc(var(--control-h) + 18px); scroll-padding-bottom: calc(var(--control-h) + 18px); }
  .msg{ max-width: 96%; }
  .chat{ min-block-size: clamp(280px, 78vh, 560px); }
  .composer{ grid-template-columns: 1fr auto auto auto; }
  .composer .name{ grid-column: 1 / -1; }
  .composer .message{ grid-column: 1 / 2; }
  .composer .emoji{ grid-column: 2 / 3; }
  .composer .attach{ grid-column: 3 / 4; }
  .composer .send{ grid-column: 4 / 5; }
  .emoji-panel{ left:0; right:auto; bottom: calc(100% + 8px); inline-size: min(320px, 100%); }
  #chat{ position:relative; }
  #composer{
    position:sticky; bottom:0;
    background: linear-gradient(180deg, rgba(22,12,42,.92), rgba(14,8,28,.96));
    border-top:1px solid rgba(213,166,255,.2);
    padding-top:10px; margin-top:12px;
    padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px));
  }

  /* Minimal mobile header row (brand + info button) — enabled only when .mobile-condensed is set by JS */
  .mobile-condensed .app-header{ gap: 8px; }
  /* Hide rail extras when condensed; nodes are also reparented into the sheet */
  .mobile-condensed #ttl-wrap,
  .mobile-condensed #safety-wrap,
  .mobile-condensed .rail-card{ display:none !important; }
  .mobile-condensed .footer small{ display:none !important; }
}

/* =========================
   Bottom sheet dialog
   ========================= */
#mobile-info{
  /* modal overlay anchored to the viewport */
  position: fixed;
  inset: 0;
  margin: 0;
  padding: clamp(16px, 5vw, 32px);
  border: 0;
  background: transparent;
  display: none;
  box-sizing: border-box;
}
#mobile-info[open]{
  display: grid;
  place-items: center;
}
#mobile-info::backdrop{
  background: rgba(4,2,10,.6);
  opacity: 0;
  transition: opacity .18s ease;
}
#mobile-info[open]::backdrop{ opacity: 1; }

#mobile-info .sheet{
  border-radius: 16px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(28,16,56,.98), rgba(18,12,38,.98));
  box-shadow: var(--shadow-1);
  padding: 14px 12px 16px;
  width: min(480px, 100%);
  max-block-size: 85vh;
  overflow:auto;
  transform: translateY(12px);
  opacity: 0;
  transition: transform .18s ease, opacity .18s ease;
}
#mobile-info[open] .sheet{
  transform: translateY(0);
  opacity: 1;
}

.sheet-close{
  display:inline-block;
  margin: 4px 0 10px;
  min-inline-size: 88px;
}
.sheet-body{
  display:grid; gap: 12px;
}
.sheet-share{
  margin-top: 12px;
  display:grid; gap: 8px;
}
.sheet-share-label{
  font-size: var(--fs-sm); color: var(--muted);
}
.sheet-share-input{
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-reduced-motion:reduce){
  #mobile-info::backdrop{ transition: none; }
  #mobile-info .sheet{ transition: none; transform:none !important; opacity:1 !important; }
}

/* Motion preferences */
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:0s !important;}
}