/* Mindveria — single stylesheet for the whole site. No frameworks. */
:root {
  --bg: #ffffff;
  --bg-soft: #f7f7f8;
  --sidebar: #171717;
  --sidebar-text: #ececec;
  --sidebar-muted: #9a9a9a;
  --text: #1f1f1f;
  --muted: #6b6b6b;
  --border: #e5e5e5;
  --accent: #0f6fff;
  --accent-dark: #0b56cc;
  --danger: #c0392b;
  --radius: 12px;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; color: var(--text); background: var(--bg); }
a { color: var(--accent); }
button { cursor: pointer; font: inherit; }

/* --- chat layout --- */
.app { display: flex; height: 100vh; }
.sidebar { width: 260px; background: var(--sidebar); color: var(--sidebar-text); display: flex; flex-direction: column; padding: 12px; gap: 8px; flex-shrink: 0; }
.sidebar .brand { font-size: 18px; font-weight: 700; padding: 8px 10px; }
.sidebar button { background: transparent; border: 1px solid #3a3a3a; color: var(--sidebar-text); border-radius: 8px; padding: 10px; text-align: left; }
.sidebar button:hover { background: #2a2a2a; }
.chat-list { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 4px; }
.chat-item { display: flex; align-items: center; gap: 6px; padding: 9px 10px; border-radius: 8px; cursor: pointer; }
.chat-item:hover, .chat-item.active { background: #2a2a2a; }
.chat-item .title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 14px; }
.chat-item .del { opacity: 0.5; font-size: 14px; }
.chat-item .del:hover { opacity: 1; }
.sidebar .side-foot { font-size: 12px; color: var(--sidebar-muted); padding: 6px 10px; }
.sidebar .side-foot a { color: var(--sidebar-muted); }
.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar { display: flex; align-items: center; gap: 12px; padding: 12px 20px; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
.topbar .spacer { flex: 1; }
.pill { font-size: 13px; background: var(--bg-soft); border: 1px solid var(--border); border-radius: 999px; padding: 6px 12px; }
.btn { background: var(--accent); color: #fff; border: none; border-radius: 8px; padding: 9px 16px; text-decoration: none; display: inline-block; }
.btn:hover { background: var(--accent-dark); }
.btn.ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn.small { padding: 6px 12px; font-size: 13px; }
.messages { flex: 1; overflow-y: auto; padding: 24px; display: flex; flex-direction: column; gap: 20px; }
.welcome { max-width: 640px; margin: auto; text-align: center; color: var(--muted); }
.welcome h1 { color: var(--text); }
.msg { max-width: 760px; width: 100%; margin: 0 auto; line-height: 1.6; }
.msg .role { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin-bottom: 4px; }
.msg.user .bubble { background: var(--bg-soft); border-radius: var(--radius); padding: 12px 16px; }
.msg.assistant .bubble { padding: 4px 0; }
.msg pre { background: #111; color: #eee; padding: 12px; border-radius: 8px; overflow-x: auto; }
.msg code { background: var(--bg-soft); padding: 2px 5px; border-radius: 4px; }
.sources { margin-top: 12px; font-size: 14px; border-top: 1px solid var(--border); padding-top: 8px; }
.composer { border-top: 1px solid var(--border); padding: 16px 20px; }
.composer-inner { max-width: 760px; margin: 0 auto; }
.controls { display: flex; gap: 10px; align-items: center; margin-bottom: 10px; flex-wrap: wrap; }
.controls select, .controls label { font-size: 14px; }
.controls select { padding: 7px 10px; border: 1px solid var(--border); border-radius: 8px; }
.input-row { display: flex; gap: 10px; }
.input-row textarea { flex: 1; resize: none; border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; font: inherit; min-height: 52px; }
.banner { max-width: 760px; margin: 0 auto 12px; padding: 12px 16px; border-radius: 8px; background: #fff7e6; border: 1px solid #f0d48a; font-size: 14px; }
.banner.error { background: #fdecea; border-color: #f0a9a0; }
.banner a { font-weight: 600; }

/* --- auth modal --- */
.modal-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; z-index: 50; }
.modal { background: #fff; border-radius: 16px; padding: 28px; width: 360px; max-width: 92vw; }
.modal h2 { margin-top: 0; }
.modal input { width: 100%; padding: 11px 12px; margin-bottom: 12px; border: 1px solid var(--border); border-radius: 8px; font: inherit; }
.modal .tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.modal .tabs button { flex: 1; padding: 9px; border: 1px solid var(--border); background: #fff; border-radius: 8px; }
.modal .tabs button.active { background: var(--text); color: #fff; }
.modal .note { font-size: 13px; color: var(--muted); }
.hidden { display: none !important; }

/* --- static pages --- */
.page { max-width: 820px; margin: 0 auto; padding: 32px 20px 60px; line-height: 1.7; }
.page header nav { display: flex; gap: 18px; align-items: center; flex-wrap: wrap; }
.page header .brand { font-weight: 700; font-size: 20px; color: var(--text); text-decoration: none; }
.site-footer { border-top: 1px solid var(--border); margin-top: 48px; padding-top: 20px; display: flex; gap: 18px; flex-wrap: wrap; font-size: 14px; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.form { display: flex; flex-direction: column; gap: 12px; max-width: 560px; }
.form input, .form textarea { padding: 11px 12px; border: 1px solid var(--border); border-radius: 8px; font: inherit; }
.pack-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 24px 0; }
.pack { border: 1px solid var(--border); border-radius: 16px; padding: 20px; }
.pack .price { font-size: 28px; font-weight: 700; margin: 8px 0; }
.pack .tokens { color: var(--muted); }
table { border-collapse: collapse; width: 100%; margin: 16px 0; }
th, td { border: 1px solid var(--border); padding: 9px 12px; text-align: left; font-size: 14px; }
th { background: var(--bg-soft); }
@media (max-width: 700px) {
  .sidebar { display: none; }
  .sidebar.open { display: flex; position: fixed; inset: 0 auto 0 0; z-index: 40; }
}