/* static/lern.css */
:root{
  /* LERN-inspired palette */
  --brand-navy:#0b2c55;
  --brand-blue:#0e5aa7;
  --brand-accent:#f2a900;

  --ink-900:#0b1220;
  --ink-700:#2c3442;
  --ink-500:#5d6676;

  --bg-50:#f6f8fb;
  --card:#ffffff;
  --line:#e6ebf2;

  --radius:14px;
  --shadow:0 10px 24px rgba(14,90,167,.08), 0 2px 6px rgba(11,44,85,.06);
}

@media (prefers-color-scheme: dark){
  :root{
    --bg-50:#0c1420;
    --card:#0f1b2b;
    --ink-900:#f5f8ff;
    --ink-700:#d6def0;
    --ink-500:#a9b4c8;
    --line:#1e2a3d;
    --shadow:none;
  }
}

*{box-sizing:border-box}

html,body{
  height:100%;
}

body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  background:linear-gradient(180deg, var(--bg-50), #fff 55%);
  color:var(--ink-900);
  padding:40px 16px;
}

/* Shell */
#chatbox{
  background:var(--card);
  padding:24px;
  border-radius:var(--radius);
  max-width:860px;
  margin:24px auto;
  box-shadow:var(--shadow);
  border:1px solid var(--line);
}

h1,h2,h3{
  margin:0 0 12px;
  color:var(--brand-navy);
}

/* Chat area */
#chat-log{
  margin-top:12px;
  padding:14px;
  min-height:160px;
  max-height:420px;
  overflow:auto;
  background:linear-gradient(180deg,#fdfefe,#f6f9ff);
  border:1px solid var(--line);
  border-radius:12px;
}

.message{margin:12px 0; line-height:1.45}
.user{font-weight:600; color:var(--brand-blue)}
#uploadMessage{font-weight:700; margin-top:10px}

/* Inputs */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="file"]{
  width:100%;
  max-width:480px;
  padding:12px 14px;
  margin-top:10px;
  border-radius:10px;
  border:1px solid var(--line);
  background:#fff;
  color:var(--ink-900);
  outline:none;
  transition:border .15s, box-shadow .15s;
}

input:focus{
  border-color:#1f6fff;
  box-shadow:0 0 0 3px rgba(31,111,255,.12);
}

/* Buttons */
button{
  margin-top:10px;
  padding:12px 16px;
  border-radius:10px;
  border:0;
  font-weight:600;
  cursor:pointer;
  color:#fff;
  background:linear-gradient(180deg, var(--brand-blue), #0b4a8a);
  box-shadow:0 2px 0 rgba(11,44,85,.15);
  transition:transform .03s, box-shadow .2s, background .2s;
  width:100%;
  max-width:220px;
}
button:hover{ box-shadow:0 6px 16px rgba(14,90,167,.24); }
button:active{ transform:translateY(1px); }

/* Cards for uploads list */
#uploadHistory > div{
  margin-bottom:12px;
  padding:12px;
  border:1px solid var(--line);
  border-radius:10px;
  background:#fff;
}

/* Links */
a{ color:var(--brand-blue); text-decoration:none; }
a:hover{ text-decoration:underline; }

/* Small helper layout for inline inputs */
.row{ display:flex; flex-wrap:wrap; gap:10px; align-items:center; }

/* Make sure long model replies look tidy */
.message strong{ color:var(--brand-navy); }
.message p{ margin:.5em 0; }
.message ul, .message ol{ margin:.5em 0 .5em 1.2em; }

@media (prefers-color-scheme: dark){
  input[type="text"],
  input[type="url"],
  input[type="email"],
  input[type="password"],
  input[type="file"],
  textarea {
    background: #1e2a3d;
    color: #f5f8ff;
    border-color: #2e3b4e;
  }

  textarea {
    background: linear-gradient(180deg, #1c2636, #1e2a3d);
  }
}