:root {
  --paper: #faf6f0;
  --ink: #2b2620;
  --muted: #8a7f70;
  --accent: #b5563a;
  --accent-dark: #93432c;
  --card: #ffffff;
  --line: #e6ddd0;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--paper);
  color: var(--ink);
  min-height: 100vh;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.4rem;
  border-bottom: 1px solid var(--line);
  background: var(--card);
}

.brand { font-weight: 700; font-size: 1.05rem; color: var(--ink); text-decoration: none; letter-spacing: 0.02em; }
nav { display: flex; gap: 0.8rem; align-items: center; }
nav .muted { color: var(--muted); font-size: 0.85rem; }

main { max-width: 1200px; margin: 0 auto; padding: 1.4rem; }

button, .btn {
  font: inherit;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  border-radius: 8px;
  padding: 0.45rem 0.9rem;
  cursor: pointer;
  text-decoration: none;
}
button:hover, .btn:hover { border-color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
button.primary:hover { background: var(--accent-dark); }
button.danger { color: #a03030; }
button:disabled { opacity: 0.5; cursor: wait; }

input[type=text], textarea {
  font: inherit;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.6rem 0.8rem;
  background: var(--card);
  color: var(--ink);
}
textarea { resize: vertical; }

.hero { text-align: center; padding: 2.5rem 1rem 2rem; }
.hero h1 { font-size: 1.8rem; margin: 0 0 0.4rem; }
.hero p { color: var(--muted); margin: 0 0 1.4rem; }
.prompt-row { display: flex; gap: 0.6rem; max-width: 640px; margin: 0 auto; }
.prompt-row input { font-size: 1.05rem; }

.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 0.9rem; margin-top: 1.6rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  color: inherit;
  text-decoration: none;
}
.card:hover { border-color: var(--accent); }
.card .title { font-weight: 600; }
.card .meta { color: var(--muted); font-size: 0.8rem; }
.badge { font-size: 0.7rem; color: var(--accent); border: 1px solid var(--accent); border-radius: 99px; padding: 0.05rem 0.5rem; width: fit-content; }

.editor { display: grid; grid-template-columns: 320px 1fr; gap: 1.2rem; align-items: start; }
@media (max-width: 900px) { .editor { grid-template-columns: 1fr; } }

.sidebar { display: flex; flex-direction: column; gap: 0.9rem; }
.sidebar h2 { margin: 0; font-size: 1.2rem; }
.chat { display: flex; flex-direction: column; gap: 0.5rem; max-height: 46vh; overflow-y: auto; }
.msg { border-radius: 10px; padding: 0.5rem 0.7rem; font-size: 0.88rem; max-width: 95%; }
.msg.user { background: #f0e4d3; align-self: flex-end; }
.msg.assistant { background: var(--card); border: 1px solid var(--line); align-self: flex-start; color: var(--muted); }
.notes { font-size: 0.85rem; color: var(--muted); padding-left: 1.1rem; margin: 0; }
.notes li { margin-bottom: 0.25rem; }

.panel { background: var(--card); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.tabs { display: flex; border-bottom: 1px solid var(--line); }
.tabs button { border: none; border-radius: 0; padding: 0.7rem 1.2rem; background: transparent; font-weight: 600; color: var(--muted); }
.tabs button.active { color: var(--accent); box-shadow: inset 0 -2px 0 var(--accent); }
.tab-body { min-height: 62vh; position: relative; }
.tab-body > div { width: 100%; height: 62vh; overflow: auto; }
#view3d canvas { display: block; }
#view2d svg { display: block; margin: 0 auto; }
#viewprint { padding: 1rem; }
.print-toolbar { display: flex; gap: 0.6rem; align-items: center; margin-bottom: 0.8rem; flex-wrap: wrap; }
.print-note { color: var(--muted); font-size: 0.85rem; }
.pages { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 0.8rem; }
.pages canvas { width: 100%; height: auto; border: 1px solid var(--line); border-radius: 6px; background: #fff; }

.login-box { max-width: 420px; margin: 3rem auto; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 2rem; text-align: center; display: flex; flex-direction: column; gap: 0.8rem; }
.login-box h1 { margin: 0; font-size: 1.4rem; }
.login-box p { color: var(--muted); margin: 0 0 0.6rem; }

.spinner { display: inline-block; width: 1em; height: 1em; border: 2px solid var(--line); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; vertical-align: -0.15em; }
@keyframes spin { to { transform: rotate(360deg); } }
.status { color: var(--muted); font-size: 0.9rem; }
.error { color: #a03030; font-size: 0.9rem; }
.center { display: flex; align-items: center; justify-content: center; height: 100%; flex-direction: column; gap: 0.6rem; }