:root{
  --accent:#387fdb;
  --accent-2:#2c6cc0;
  --navy:#26303c;
  --ink:#26303c;
  --muted:#6b7480;
  --line:#e6e8ec;
  --bg:#f6f8fb;
  --card:#ffffff;
  --radius:16px;
  --shadow:0 1px 2px rgba(20,30,50,.04), 0 8px 30px rgba(20,30,50,.07);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:var(--font);color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;line-height:1.55}

/* Real Adam Erhart logo (used as-is) */
.logo-full{display:block;height:auto;max-width:100%}
.topbar-logo{height:24px;width:auto}
.login-logo{width:230px;max-width:74%;margin:0 auto 20px}
.welcome-logo{width:280px;max-width:82%;margin:0 auto 4px}

/* Brand mark + wordmark (legacy, kept for favicon only) */
.mark{display:block;flex:none}
.mark.sm{height:28px}
.mark.lg{height:56px;margin:0 auto}
.wordmark{font-weight:400;color:var(--navy);letter-spacing:-.01em;font-size:19px;white-space:nowrap}
.wordmark b{font-weight:700}
.wordmark.lg{font-size:26px;display:block}
/* assistant avatar keeps a small blue chip */
.brand-badge{width:30px;height:30px;border-radius:9px;background:var(--accent);
  color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:15px;flex:none}

/* ---------- Login ---------- */
.login-body{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;
  background:radial-gradient(1200px 600px at 50% -10%,#eef0ff,var(--bg))}
.login-card{background:var(--card);border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);
  padding:40px 34px;max-width:400px;width:100%;text-align:center}
.login-card .mark.lg{margin:0 auto 16px}
.login-card h1{font-size:24px;margin:0 0 8px;letter-spacing:-.02em}
.login-card .sub{color:var(--muted);font-size:15px;margin:0 0 24px}
.login-card form{text-align:left;display:flex;flex-direction:column;gap:8px}
.login-card label{font-size:13px;font-weight:600;color:var(--muted)}
.login-card input{padding:13px 14px;border:1px solid var(--line);border-radius:12px;font-size:15px;outline:none;transition:border .15s}
.login-card input:focus{border-color:var(--accent)}
.login-card button{margin-top:8px;padding:13px;border:0;border-radius:12px;background:var(--accent);color:#fff;
  font-size:15px;font-weight:600;cursor:pointer;transition:filter .15s}
.login-card button:hover{filter:brightness(1.06)}
.login-card .foot{color:var(--muted);font-size:12.5px;margin:20px 0 0}
.err{background:#fff1f0;color:#b42318;border:1px solid #ffd7d2;border-radius:10px;padding:10px 12px;font-size:13.5px;margin:0 0 14px;text-align:left}
.ok{background:#eef7f0;color:#1a7f4b;border:1px solid #cdead6;border-radius:10px;padding:10px 12px;font-size:13.5px;margin:0 0 14px;text-align:left}

/* ---------- App shell ---------- */
.topbar{position:sticky;top:0;z-index:10;background:rgba(247,247,251,.85);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line)}
.topbar-in{max-width:820px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.01em}
.logout{color:var(--muted);text-decoration:none;font-size:14px}
.logout:hover{color:var(--ink)}

.chat{max-width:820px;margin:0 auto;padding:24px 20px 140px}

/* Welcome / empty state */
.welcome{text-align:center;padding:56px 0 20px}
.welcome h1{font-size:28px;letter-spacing:-.02em;margin:20px 0 8px}
.welcome p{color:var(--muted);max-width:520px;margin:0 auto 28px}
.starters{display:grid;grid-template-columns:1fr 1fr;gap:10px;max-width:620px;margin:0 auto}
.starters button{text-align:left;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:14px 16px;
  font-size:14px;color:var(--ink);cursor:pointer;transition:border .15s,transform .05s;font-family:inherit}
.starters button:hover{border-color:var(--accent)}
.starters button:active{transform:translateY(1px)}

/* Messages */
.messages{display:flex;flex-direction:column;gap:22px}
.msg{display:flex;gap:12px}
.msg .avatar{flex:none;width:30px;height:30px;border-radius:9px;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:13px}
.msg.user{justify-content:flex-end}
.msg.user .bubble{background:var(--accent);color:#fff;padding:11px 15px;border-radius:16px 16px 4px 16px;max-width:78%;white-space:pre-wrap}
.msg.assistant .avatar{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff}
.msg.assistant .body{flex:1;min-width:0}
.answer{font-size:15.5px}
.answer h3{font-size:16px;margin:18px 0 6px}
.answer p{margin:0 0 12px}
.answer ul{margin:0 0 12px;padding-left:20px}
.answer li{margin:0 0 6px}
.answer strong{font-weight:700}
.cite{display:inline-flex;align-items:center;justify-content:center;min-width:17px;height:17px;padding:0 4px;margin:0 1px;
  font-size:11px;font-weight:700;color:var(--accent);background:#eef0ff;border-radius:5px;text-decoration:none;vertical-align:2px}
.cite:hover{background:var(--accent);color:#fff}

/* typing dots */
.typing{display:inline-flex;gap:4px;padding:6px 0}
.typing span{width:7px;height:7px;border-radius:50%;background:var(--muted);opacity:.4;animation:blink 1.2s infinite}
.typing span:nth-child(2){animation-delay:.2s}.typing span:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.25}40%{opacity:.9}}

/* Source cards */
.sources{margin-top:16px}
.sources-title{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin:0 0 8px}
.source{display:flex;align-items:center;gap:10px;background:var(--card);border:1px solid var(--line);border-radius:12px;
  padding:10px 12px;margin-bottom:8px;text-decoration:none;color:var(--ink);transition:border .15s}
.source:hover{border-color:var(--accent)}
.source .play{flex:none;width:26px;height:26px;border-radius:7px;background:#eef0ff;color:var(--accent);display:flex;align-items:center;justify-content:center}
.source .meta{min-width:0}
.source .t{font-size:13.5px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.source .s{font-size:12px;color:var(--muted)}

/* Follow-up suggestions */
.followups{margin-top:18px}
.followups-title{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin:0 0 8px}
.followup{display:block;width:100%;text-align:left;background:#eef4fd;border:1px solid #d8e6fa;color:var(--accent-2);
  border-radius:11px;padding:10px 13px;margin-bottom:7px;font-size:14px;font-family:inherit;cursor:pointer;transition:background .15s}
.followup:hover{background:#e2edfb}

/* Composer */
.composer{position:fixed;bottom:0;left:0;right:0;background:linear-gradient(transparent,var(--bg) 22%);padding:14px 20px 16px}
.composer-in{max-width:820px;margin:0 auto;display:flex;gap:10px;align-items:flex-end;background:var(--card);
  border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:8px 8px 8px 16px}
#input{flex:1;border:0;outline:0;resize:none;font-family:inherit;font-size:15.5px;line-height:1.5;max-height:160px;padding:8px 0;background:transparent;color:var(--ink)}
#send{flex:none;width:40px;height:40px;border:0;border-radius:12px;background:var(--accent);color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:filter .15s}
#send:hover{filter:brightness(1.08)}
#send:disabled{opacity:.4;cursor:default}
.disclaimer{max-width:820px;margin:8px auto 0;text-align:center;color:var(--muted);font-size:12px}

@media(max-width:640px){
  .starters{grid-template-columns:1fr}
  .welcome{padding:36px 0 12px}
  .msg.user .bubble{max-width:88%}
}