:root {
  --bg: #070b14;
  --bg2: #0c1220;
  --card: #121a2b;
  --border: #1e2a40;
  --text: #e8eef8;
  --muted: #8b9bb4;
  --primary: #00d2ff;
  --primary-dim: #00a8cc;
  --accent: #7b61ff;
  --danger: #ff5c7a;
  --radius: 12px;
  --font: "Inter", system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--muted); }
.tiny { font-size: 0.75rem; }
.error { color: var(--danger); margin: 0.5rem 0; }

/* Nav */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem 2rem; border-bottom: 1px solid var(--border);
  background: rgba(7,11,20,0.85); backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 50;
}
.brand { display: flex; align-items: center; gap: 0.6rem; font-weight: 700; font-size: 1.15rem; color: var(--text); text-decoration: none; }
.brand.center { justify-content: center; margin-bottom: 1rem; }
.brand.small { font-size: 1rem; }
.logo { width: 32px; height: 32px; border-radius: 8px; }
.nav-links { display: flex; gap: 0.5rem; align-items: center; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  padding: 0.55rem 1.1rem; border-radius: 8px; border: none; cursor: pointer;
  font-size: 0.95rem; font-weight: 600; transition: 0.15s;
}
.btn-primary { background: var(--primary); color: #041018; }
.btn-primary:hover { background: var(--primary-dim); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.85rem; }
.btn-lg { padding: 0.85rem 1.6rem; font-size: 1.05rem; }
.btn-block { width: 100%; }

/* Hero */
.hero {
  text-align: center; padding: 5rem 1.5rem 3rem; position: relative; overflow: hidden;
}
.hero-glow {
  position: absolute; top: -20%; left: 50%; transform: translateX(-50%);
  width: 600px; height: 400px; background: radial-gradient(ellipse, rgba(0,210,255,0.18), transparent 70%);
  pointer-events: none;
}
.hero h1 { font-size: clamp(2.4rem, 6vw, 3.8rem); letter-spacing: -0.03em; margin-bottom: 0.75rem; }
.hero-sub { color: var(--muted); font-size: 1.2rem; max-width: 520px; margin: 0 auto 2rem; }

.features {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem; max-width: 1000px; margin: 0 auto; padding: 2rem 1.5rem;
}
.feature-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.4rem;
}
.feature-card h3 { margin-bottom: 0.4rem; font-size: 1.05rem; }
.feature-card p { color: var(--muted); font-size: 0.92rem; }

.models { max-width: 1000px; margin: 2rem auto; padding: 0 1.5rem 3rem; }
.models h2 { margin-bottom: 1rem; }
.model-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0.75rem; }
.model-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 10px;
  padding: 1rem; display: flex; flex-direction: column; gap: 0.25rem;
}
.model-card .dot { width: 8px; height: 8px; border-radius: 50%; background: #22c55e; }

.footer { text-align: center; padding: 2rem; border-top: 1px solid var(--border); color: var(--muted); font-size: 0.85rem; }

/* Auth */
.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 1.5rem; }
.auth-card {
  width: 100%; max-width: 400px; background: var(--card); border: 1px solid var(--border);
  border-radius: 16px; padding: 2rem;
}
.auth-card h1 { text-align: center; margin-bottom: 1.25rem; font-size: 1.5rem; }
.auth-card input {
  width: 100%; padding: 0.75rem 1rem; margin-bottom: 0.75rem;
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px;
  color: var(--text); font-size: 1rem;
}
.auth-card form { margin-bottom: 1rem; }

/* Chat shell */
.app-shell { display: flex; height: 100vh; overflow: hidden; }
.sidebar {
  width: 280px; background: var(--bg2); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; flex-shrink: 0;
}
.sidebar-head { padding: 1rem; display: flex; flex-direction: column; gap: 0.75rem; border-bottom: 1px solid var(--border); }
.chat-list { flex: 1; overflow-y: auto; padding: 0.5rem; }
.chat-item {
  padding: 0.65rem 0.85rem; border-radius: 8px; cursor: pointer; font-size: 0.9rem;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis; color: var(--muted);
}
.chat-item:hover, .chat-item.active { background: var(--card); color: var(--text); }
.sidebar-foot { padding: 0.75rem; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 0.5rem; }
.select {
  width: 100%; padding: 0.45rem 0.6rem; background: var(--bg); border: 1px solid var(--border);
  border-radius: 6px; color: var(--text); font-size: 0.85rem;
}
.link { font-size: 0.8rem; }

.chat-main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.chat-messages { flex: 1; overflow-y: auto; padding: 1.5rem; display: flex; flex-direction: column; gap: 1rem; }
.welcome { margin: auto; text-align: center; color: var(--muted); max-width: 360px; }
.welcome-logo { width: 64px; height: 64px; margin-bottom: 1rem; border-radius: 16px; }
.msg { max-width: 720px; width: 100%; margin: 0 auto; display: flex; gap: 0.75rem; }
.msg.user { flex-direction: row-reverse; }
.msg-bubble {
  background: var(--card); border: 1px solid var(--border); border-radius: 14px;
  padding: 0.9rem 1.1rem; font-size: 0.95rem; white-space: pre-wrap; word-break: break-word;
}
.msg.user .msg-bubble { background: #0e2a3a; border-color: #1a4a5c; }
.msg-role { font-size: 0.7rem; color: var(--muted); margin-bottom: 0.25rem; }

.composer {
  border-top: 1px solid var(--border); padding: 1rem 1.5rem 1.25rem; background: var(--bg2);
}
.file-pills { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-bottom: 0.5rem; }
.pill {
  background: var(--card); border: 1px solid var(--border); border-radius: 999px;
  padding: 0.25rem 0.7rem; font-size: 0.8rem; display: flex; align-items: center; gap: 0.4rem;
}
.pill button { background: none; border: none; color: var(--muted); cursor: pointer; font-size: 1rem; }
.composer-row {
  max-width: 720px; margin: 0 auto; display: flex; gap: 0.5rem; align-items: flex-end;
  background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 0.5rem;
}
.composer-row textarea {
  flex: 1; background: transparent; border: none; color: var(--text); resize: none;
  font-size: 0.95rem; padding: 0.5rem; max-height: 160px; outline: none; font-family: inherit;
}
.upload-btn {
  display: flex; align-items: center; justify-content: center; width: 40px; height: 40px;
  color: var(--muted); cursor: pointer; border-radius: 8px;
}
.upload-btn:hover { color: var(--primary); background: rgba(0,210,255,0.08); }

/* Admin */
.admin-wrap { max-width: 1100px; margin: 0 auto; padding: 2rem 1.5rem 4rem; }
.admin-wrap h1 { margin-bottom: 0.35rem; }
.admin-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem; margin: 1.5rem 0;
}
.panel {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 1.25rem;
}
.panel h2 { font-size: 1rem; margin-bottom: 0.85rem; color: var(--primary); }
.panel label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 0.75rem; }
.panel input[type="text"], .panel input[type="password"], .panel input:not([type]), .panel textarea {
  width: 100%; margin-top: 0.3rem; padding: 0.55rem 0.75rem;
  background: var(--bg); border: 1px solid var(--border); border-radius: 8px; color: var(--text);
}
.panel textarea { resize: vertical; font-family: inherit; }
.check { display: flex !important; align-items: center; gap: 0.5rem; color: var(--text) !important; }
.user-list { list-style: none; font-size: 0.9rem; }
.user-list li { padding: 0.35rem 0; border-bottom: 1px solid var(--border); }

@media (max-width: 768px) {
  .sidebar { display: none; }
  .nav { padding: 0.75rem 1rem; }
  .hero { padding: 3rem 1rem 2rem; }
}


/* mobile-zoomai */
@media (max-width: 768px) {
  .nav { padding: 0.75rem 1rem; flex-wrap: wrap; gap: 0.5rem; }
  .nav-links { width: 100%; justify-content: flex-end; }
  .hero { padding: 3rem 1rem 2rem; }
  .hero h1 { font-size: 2rem; }
  .hero-sub { font-size: 1rem; }
  .features { grid-template-columns: 1fr; padding: 1rem; }
  .models { padding: 0 1rem 2rem; }
  .app-shell { flex-direction: column; height: auto; min-height: 100vh; }
  .sidebar {
    display: flex !important;
    width: 100%;
    max-height: 40vh;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .chat-main { min-height: 60vh; }
  .composer { padding: 0.75rem; }
  .composer-row { border-radius: 12px; }
  .auth-card { margin: 1rem; padding: 1.5rem; }
  .admin-wrap { padding: 1rem; }
  .admin-grid { grid-template-columns: 1fr; }
  .msg { max-width: 100%; }
}