:root {
  --bg: #f6f6fb;
  --panel: #ffffff;
  --border: #e5e5ef;
  --text: #1f1f2e;
  --muted: #6b6b80;
  --violet: #6d5efc;
  --violet-soft: #f0eeff;
  --violet-border: #dcd6ff;
  --user-bg: #f0f0f6;
  --good: #16a34a;
  --warn: #b45309;
  --bad: #dc2626;
  --radius: 14px;
  --sidebar-w: 250px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
}

a { color: inherit; text-decoration: none; }

/* ------------------------------------------------------------------ */
/* App shell                                                          */
/* ------------------------------------------------------------------ */
.app { display: flex; width: 100%; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 auto;
  background: #fff;
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 18px 14px;
  border-bottom: 1px solid var(--border);
}
.brand .logo { font-size: 20px; color: var(--violet); }
.brand-text h1 { margin: 0; font-size: 15px; letter-spacing: -0.01em; }
.brand-text p { margin: 0; font-size: 12px; color: var(--muted); }

.nav { flex: 1; overflow-y: auto; padding: 12px 10px; display: flex; flex-direction: column; gap: 4px; }
.nav a {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 13.5px;
  color: var(--muted);
  transition: background 0.15s, color 0.15s;
}
.nav a:hover { background: var(--violet-soft); color: var(--text); }
.nav a.active { background: var(--violet-soft); color: var(--violet); font-weight: 600; }
.nav a .num { display: block; font-size: 11px; color: var(--muted); opacity: 0.8; }
.nav a .title { display: block; font-size: 13.5px; color: inherit; }

.content { flex: 1; min-width: 0; overflow-x: hidden; }
.view { max-width: 900px; margin: 0 auto; padding: 36px 32px 80px; }

/* ------------------------------------------------------------------ */
/* Module page                                                        */
/* ------------------------------------------------------------------ */
.page-head { margin-bottom: 22px; }
.kicker {
  display: inline-block;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--violet);
  border: 1px solid var(--violet-border);
  background: var(--violet-soft);
  border-radius: 999px;
  padding: 4px 11px;
  margin-bottom: 12px;
}
.page-head h2 { margin: 0 0 6px; font-size: 26px; letter-spacing: -0.02em; }
.page-head p { margin: 0; color: var(--muted); font-size: 15px; }
.tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 12px; }
.tag { font-size: 12px; padding: 4px 10px; border-radius: 999px; background: #fff; border: 1px solid var(--border); color: var(--muted); }

.meta-list { list-style: none; margin: 0; padding: 0; }
.meta-list li { display: flex; gap: 12px; font-size: 14px; color: var(--muted); padding: 8px 0; border-bottom: 1px dashed var(--border); }
.meta-list li:last-child { border-bottom: none; }
.meta-list li b { color: var(--text); min-width: 120px; font-weight: 600; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 22px;
}
.card h3 { margin: 0 0 6px; font-size: 16px; }
.card.chat { padding: 0; overflow: hidden; }

.traffic { display: flex; flex-wrap: wrap; gap: 10px; }
.light { flex: 1 1 140px; border-radius: 12px; padding: 12px 14px; border: 1px solid var(--border); font-size: 13px; background: #fff; }
.light b { display: block; margin-bottom: 4px; font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; }
.light.green { background: #f0fdf4; border-color: #bbf7d0; }
.light.green b { color: var(--good); }
.light.yellow { background: #fffbeb; border-color: #fde68a; }
.light.yellow b { color: var(--warn); }
.light.red { background: #fef2f2; border-color: #fecaca; }
.light.red b { color: var(--bad); }

.diagram { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; overflow-x: auto; }
.diagram .mermaid { display: flex; justify-content: center; }

/* Overview grid */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.grid .card { cursor: pointer; transition: box-shadow 0.15s, transform 0.15s; margin-bottom: 0; }
.grid .card:hover { box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08); transform: translateY(-2px); }
.grid .card .num { font-size: 11px; font-weight: 700; letter-spacing: 0.1em; color: var(--violet); text-transform: uppercase; }
.grid .card p { color: var(--muted); font-size: 14px; }

/* ------------------------------------------------------------------ */
/* Chat (embedded per module)                                         */
/* ------------------------------------------------------------------ */
.chat { border: 1px solid var(--border); border-radius: var(--radius); background: #fff; overflow: hidden; }
.chat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: #fafafe;
}
.chat-head .title { font-weight: 600; font-size: 14px; }
.chat-head select { font-size: 12px; padding: 6px 8px; border: 1px solid var(--border); border-radius: 8px; background: #fff; color: var(--text); }

.messages { height: 360px; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.empty { margin: auto; text-align: center; color: var(--muted); font-size: 14px; max-width: 420px; }

.msg { max-width: 85%; border-radius: var(--radius); padding: 9px 13px 11px; font-size: 14px; line-height: 1.55; border: 1px solid var(--border); }
.msg.user { align-self: flex-end; background: var(--user-bg); }
.msg.assistant { align-self: flex-start; background: var(--violet-soft); border-color: var(--violet-border); }
.msg.assistant.thinking { opacity: 0.7; font-style: italic; }
.msg-head { display: flex; align-items: center; gap: 8px; margin-bottom: 5px; }
.who { font-weight: 600; font-size: 12px; color: var(--violet); }
.msg.user .who { color: var(--muted); }
.time { font-size: 11px; color: var(--muted); margin-left: auto; }
.toolbadge { display: inline-block; font-size: 11px; color: var(--violet); background: #fff; border: 1px solid var(--violet-border); border-radius: 999px; padding: 2px 8px; margin-left: 6px; }

.msg-body p { margin: 0 0 8px; }
.msg-body p:last-child { margin-bottom: 0; }
.msg-body ul, .msg-body ol { margin: 4px 0 8px; padding-left: 20px; }
.msg-body li { margin: 2px 0; }
.msg-body h2, .msg-body h3, .msg-body h4 { margin: 10px 0 4px; line-height: 1.3; }
.msg-body code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12.5px; background: rgba(0,0,0,0.06); padding: 1px 5px; border-radius: 5px; }
.msg-body pre.code { background: #1f1f2e; color: #f2f2f7; padding: 12px; border-radius: 10px; overflow-x: auto; margin: 8px 0; }
.msg-body pre.code code { background: transparent; color: inherit; padding: 0; }
.msg-body a { color: var(--violet); }
.msg-body blockquote { margin: 6px 0; padding: 2px 12px; border-left: 3px solid var(--violet-border); color: var(--muted); }
.msg.user .msg-body { white-space: pre-wrap; word-break: break-word; }

.composer { display: flex; gap: 8px; align-items: flex-end; padding: 12px 16px; border-top: 1px solid var(--border); background: #fafafe; }
.composer .name { width: 140px; flex: 0 0 auto; padding: 9px 11px; border: 1px solid var(--border); border-radius: 10px; font-size: 13px; }
.composer .draft { flex: 1; resize: none; padding: 9px 11px; border: 1px solid var(--border); border-radius: 10px; font-size: 14px; font-family: inherit; min-height: 40px; max-height: 140px; }
.composer .send { flex: 0 0 auto; padding: 9px 16px; border: none; border-radius: 10px; background: var(--violet); color: #fff; font-weight: 600; cursor: pointer; font-size: 14px; }
.composer .send:disabled { opacity: 0.5; cursor: default; }

/* ------------------------------------------------------------------ */
/* Responsive                                                         */
/* ------------------------------------------------------------------ */
@media (max-width: 720px) {
  .app { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; flex-direction: column; }
  .nav { flex-direction: row; overflow-x: auto; }
  .nav a { white-space: nowrap; }
  .composer .name { display: none; }
}