:root {
      --bg: #0a0a0b;
      --panel: #131315;
      --panel-2: #17171a;
      --line: #232326;
      --line-2: #2e2e33;
      --text: #f4f4f5;
      --muted: #8b8b93;
      --neon: #d9ff35;
      --neon-dim: #b8e01f;
    }
    * { box-sizing: border-box; margin: 0; }
    html, body { height: 100%; }
    body {
      font-family: Inter, system-ui, sans-serif;
      background: var(--bg); color: var(--text);
      display: flex; flex-direction: column; overflow: hidden;
    }
    button { font-family: inherit; }

    /* ── Top bar ─────────────────────────────── */
    .topbar {
      display: flex; align-items: center; gap: 1.6rem;
      padding: 0 1.25rem; height: 58px; flex-shrink: 0;
      border-bottom: 1px solid var(--line);
    }
    .logo { display: flex; align-items: center; gap: .6rem; font-weight: 900; font-size: 1.15rem; letter-spacing: -.02em; }
    .logo-mark {
      width: 28px; height: 28px; border-radius: 8px;
      background: linear-gradient(135deg, var(--neon), #58d68d);
      display: grid; place-items: center; color: #0a0a0b; font-size: .95rem; font-weight: 900;
    }
    .nav { display: flex; gap: 1.4rem; font-size: .92rem; color: var(--muted); }
    .nav span { cursor: default; }
    .nav span:hover { color: var(--text); }
    .nav .new {
      font-size: .62rem; font-weight: 700; color: var(--bg);
      background: var(--neon); border-radius: 5px; padding: .1rem .35rem;
      vertical-align: middle; margin-left: .3rem;
    }
    .topbar .auth { margin-left: auto; display: flex; gap: .6rem; }
    .btn-ghost {
      background: none; border: 1px solid var(--line-2); color: var(--text);
      border-radius: 10px; padding: .45rem 1rem; font-size: .88rem; font-weight: 600; cursor: pointer;
    }
    .btn-ghost:hover { border-color: #4a4a52; }
    .btn-neon {
      background: var(--neon); border: none; color: #0a0a0b;
      border-radius: 10px; padding: .45rem 1rem; font-size: .88rem; font-weight: 700; cursor: pointer;
    }
    .btn-neon:hover { background: var(--neon-dim); }

    /* ── Shell ───────────────────────────────── */
    .shell { display: flex; flex: 1; min-height: 0; }

    /* Sidebar */
    .sidebar {
      width: 264px; flex-shrink: 0; padding: 1rem .85rem;
      border-right: 1px solid var(--line);
      display: flex; flex-direction: column; gap: .25rem;
      background: rgba(19,19,21,.5);
    }
    .side-label {
      font-size: .7rem; font-weight: 700; letter-spacing: .12em;
      color: var(--muted); text-transform: uppercase;
      padding: .9rem .55rem .45rem;
    }
    .side-item {
      display: flex; align-items: center; gap: .7rem;
      padding: .5rem .55rem; border-radius: 12px;
      font-size: .95rem; font-weight: 500; color: var(--text);
      cursor: pointer; border: 1px solid transparent;
    }
    .side-item:hover { background: var(--panel-2); }
    .side-item.active { background: var(--panel-2); border-color: var(--line); }
    .tile {
      width: 34px; height: 34px; flex: 0 0 34px; border-radius: 10px;
      display: grid; place-items: center; font-size: .95rem; font-weight: 800; color: #0a0a0b;
    }
    .tile.home { background: linear-gradient(135deg, #e2e8f0, #94a3b8); }
    .tile.nova { background: linear-gradient(135deg, #38bdf8, #818cf8); }
    .tile.zephyr { background: linear-gradient(135deg, #34d399, #fbbf24); }
    .tile.feed { background: linear-gradient(135deg, #f472b6, #fb7185); }
    .tile.gallery { background: linear-gradient(135deg, #f472b6, #fb7185); }
    .tile.persona { background: linear-gradient(135deg, #a78bfa, #6366f1); }
    .side-item .sub { display: block; font-size: .72rem; color: var(--muted); font-weight: 400; }
    .new-chat {
      margin-top: .35rem; display: flex; align-items: center; gap: .7rem;
      padding: .5rem .55rem; border-radius: 12px; cursor: pointer;
      color: var(--muted); font-size: .95rem; border: 1px dashed var(--line-2); background: none; width: 100%;
      text-align: left;
    }
    .new-chat:hover { color: var(--text); border-color: #4a4a52; }
    .new-chat .plus {
      width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
      background: var(--panel-2); border: 1px solid var(--line-2); font-size: 1.1rem; color: var(--text);
    }

    /* Main */
    .main {
      flex: 1; min-width: 0; position: relative;
      display: flex; flex-direction: column;
      background-image:
        linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px);
      background-size: 44px 44px;
    }

    /* ── Home / select view ──────────────────── */
    .home-view {
      flex: 1; display: flex; flex-direction: column;
      align-items: center; justify-content: center; gap: 2.4rem;
      padding: 2rem 1.5rem; overflow-y: auto;
    }
    .hero { text-align: center; }
    .hero h1 {
      font-size: clamp(2rem, 4.6vw, 3.4rem); font-weight: 900;
      letter-spacing: -.03em; line-height: 1.04; text-transform: uppercase;
    }
    .hero h1 .accent { color: var(--neon); display: block; }
    .agents { display: flex; gap: 1.1rem; flex-wrap: wrap; justify-content: center; }
    .agent-card {
      width: 250px; padding: 1.4rem 1.3rem; text-align: left;
      background: var(--panel); border: 1px solid var(--line); border-radius: 18px;
      cursor: pointer; transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
    }
    .agent-card:hover { transform: translateY(-3px); border-color: var(--line-2); }
    .agent-card.selected { border-color: var(--neon); box-shadow: 0 0 0 1px var(--neon), 0 12px 40px rgba(217,255,53,.08); }
    .agent-card .tile { width: 46px; height: 46px; border-radius: 13px; font-size: 1.2rem; margin-bottom: .9rem; }
    .agent-card .aname { font-weight: 700; font-size: 1.08rem; }
    .agent-card .atag { color: var(--muted); font-size: .85rem; margin-top: .25rem; line-height: 1.45; }
    .agent-card .astart { margin-top: .9rem; font-size: .8rem; font-weight: 700; color: var(--neon); opacity: 0; transition: opacity .15s ease; }
    .agent-card:hover .astart, .agent-card.selected .astart { opacity: 1; }

    /* ── Chat view ───────────────────────────── */
    .chat { flex: 1; display: none; flex-direction: column; min-height: 0; }
    .chat.active { display: flex; }
    .chat-head {
      display: flex; align-items: center; gap: .75rem;
      padding: .8rem 1.4rem; border-bottom: 1px solid var(--line);
      background: rgba(10,10,11,.7); backdrop-filter: blur(8px);
    }
    .chat-head .tile { width: 38px; height: 38px; }
    .chat-head .cname { font-weight: 700; }
    .chat-head .cstatus { font-size: .74rem; color: var(--neon); }
    .chat-head .btn-ghost { margin-left: auto; font-size: .82rem; padding: .4rem .85rem; }
    .thread {
      flex: 1; overflow-y: auto; padding: 1.6rem 1.5rem;
      display: flex; flex-direction: column; gap: .7rem;
    }
    .thread-inner { width: 100%; max-width: 780px; margin: 0 auto; display: flex; flex-direction: column; gap: .7rem; }
    .msg {
      max-width: 78%; padding: .7rem 1rem; border-radius: 16px;
      font-size: .95rem; line-height: 1.5; white-space: pre-wrap; word-wrap: break-word;
    }
    .msg.user { align-self: flex-end; background: var(--neon); color: #0a0a0b; border-bottom-right-radius: 5px; font-weight: 500; }
    .msg.agent { align-self: flex-start; background: var(--panel-2); border: 1px solid var(--line); border-bottom-left-radius: 5px; }
    .msg.typing { color: var(--muted); }
    .msg.typing .dots::after { content: '·'; animation: dots 1.2s steps(3, end) infinite; letter-spacing: 2px; }
    @keyframes dots { 33% { content: '··'; } 66% { content: '···'; } }

    /* ── Composer (shared) ───────────────────── */
    .composer-wrap { padding: 1rem 1.5rem 1.4rem; flex-shrink: 0; }
    .composer {
      display: flex; flex-direction: column; align-items: stretch; gap: 1.4rem;
      width: 100%; max-width: 1120px; margin: 0 auto;
      background: var(--panel); border: 1px solid var(--line-2);
      border-radius: 24px; padding: 1.35rem 1.35rem 1.1rem 1.5rem;
      box-shadow: 0 20px 60px rgba(0,0,0,.45);
    }
    .composer input {
      flex: 1; background: none; border: none; outline: none;
      color: var(--text); font-size: 1.1rem; font-family: inherit; min-width: 0;
      padding: .3rem 0 1.2rem;
    }
    .composer-row {
      display: flex; align-items: center; gap: 1rem;
    }
    .composer-row .send { margin-left: auto; }
    .composer input::placeholder { color: #5c5c66; }
    .send {
      flex-shrink: 0; background: var(--neon); color: #0a0a0b;
      border: none; border-radius: 16px; padding: 1.05rem 2rem;
      font-size: 1rem; font-weight: 800; letter-spacing: .04em; cursor: pointer;
      box-shadow: 0 6px 28px rgba(217,255,53,.28);
      transition: transform .12s ease, background .12s ease;
    }
    .send:hover { background: var(--neon-dim); transform: translateY(-1px); }
    .send:disabled { opacity: .4; transform: none; cursor: default; box-shadow: none; }

    @media (max-width: 900px) {
      .sidebar { display: none; }
      .nav { display: none; }
    }

/* ── Model picker (chat header) ──────────── */
.head-actions { margin-left: auto; display: flex; align-items: center; gap: .6rem; }
.head-actions .btn-ghost { margin-left: 0; }
.model-wrap { position: relative; }
.model-menu {
  position: absolute; top: calc(100% + 8px); right: 0; min-width: 250px;
  background: var(--panel); border: 1px solid var(--line-2); border-radius: 14px;
  padding: .4rem; display: none; z-index: 50;
  box-shadow: 0 20px 60px rgba(0,0,0,.55);
}
.model-menu.open { display: block; }
.model-item {
  padding: .55rem .8rem; border-radius: 10px; font-size: .9rem;
  cursor: pointer; display: flex; justify-content: space-between; gap: 1rem;
}
.model-item:hover { background: var(--panel-2); }
.model-item .check { color: transparent; }
.model-item.selected .check { color: var(--neon); }
.model-item.disabled { color: var(--muted); cursor: default; font-size: .8rem; }
.model-item.disabled:hover { background: none; }

.msg.video { padding: .45rem; max-width: 68%; }
.msg.video video { display: block; width: 460px; max-width: 100%; border-radius: 12px; }

/* ── Image/Video mode switch ─────────────── */
.mode-switch {
  display: flex; flex-shrink: 0; gap: 2px; padding: 3px;
  background: var(--panel-2); border: 1px solid var(--line-2); border-radius: 12px;
}
.mode-btn {
  background: none; border: none; color: var(--muted);
  font-weight: 600; font-size: .85rem; padding: .5rem .9rem;
  border-radius: 9px; cursor: pointer;
}
.mode-btn:hover { color: var(--text); }
.mode-btn.active { background: var(--neon); color: #0a0a0b; }
.msg.image { padding: .45rem; max-width: 68%; }
.msg.image img { display: block; width: 380px; max-width: 100%; border-radius: 12px; }

/* ── Attachment pickers ──────────────────── */
.composer-top { display: flex; align-items: flex-start; gap: 1rem; }
.composer-top input { padding-top: .55rem; }
.attach-group { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; }
.attach-btn {
  background: none; border: 1px dashed var(--line-2); color: var(--muted);
  border-radius: 12px; padding: .75rem 1.15rem; font-size: .95rem;
  cursor: pointer; display: flex; align-items: center; gap: .5rem; flex-shrink: 0;
}
.attach-btn small { color: #5c5c66; font-size: .75rem; }
.attach-btn:hover { color: var(--text); border-color: #4a4a52; }
.attach-btn.has { border-style: solid; border-color: var(--neon); color: var(--text); padding: .4rem .6rem; }
.attach-btn.has img { width: 36px; height: 36px; object-fit: cover; border-radius: 8px; display: block; }
.attach-btn .x { color: var(--muted); font-size: 1.15rem; padding: 0 .25rem; }
.attach-btn .x:hover { color: var(--text); }

/* ── Duration / ratio pickers ────────────── */
.opt-wrap { position: relative; }
.opt-btn {
  background: none; border: 1px solid var(--line-2); color: var(--muted);
  border-radius: 12px; padding: .7rem 1rem; font-size: .9rem;
  cursor: pointer; display: flex; align-items: center; gap: .4rem;
}
.opt-btn b { color: var(--text); font-weight: 600; }
.opt-btn:hover { border-color: #4a4a52; color: var(--text); }
.model-menu.drop-up { top: auto; bottom: calc(100% + 10px); right: auto; left: 0; min-width: 130px; }

/* ── Advanced settings bar ───────────────── */
.advanced { width: 100%; max-width: 1120px; margin: 0 auto .7rem; }
.advanced-toggle {
  display: inline-flex; align-items: center; gap: .5rem;
  background: none; border: 1px solid var(--line); color: var(--muted);
  border-radius: 999px; padding: .5rem 1rem; font-size: .85rem; font-weight: 600;
  cursor: pointer;
}
.advanced-toggle:hover { color: var(--text); border-color: var(--line-2); }
.advanced-toggle .gear { font-size: .95rem; }
.advanced-toggle .chev { transition: transform .18s ease; }
.advanced-toggle.open .chev { transform: rotate(180deg); }
.advanced-toggle.open { color: var(--text); border-color: var(--neon); }
.advanced-panel {
  display: none; gap: .6rem; margin-top: .7rem; flex-wrap: wrap; align-items: center;
}
.advanced-panel.open { display: flex; }
.adv-pill {
  display: flex; align-items: center; gap: .5rem;
  background: var(--panel); border: 1px solid var(--line-2); color: var(--text);
  border-radius: 12px; padding: .6rem .95rem; font-size: .9rem; cursor: pointer;
}
.adv-pill small { color: var(--muted); font-size: .72rem; text-transform: uppercase; letter-spacing: .06em; }
.adv-pill b { font-weight: 600; }
.adv-pill:hover { border-color: #4a4a52; }