:root {
  --bg: #ffffff;
  --panel: #fafafa;
  --border: #ececec;
  --text: #333333;
  --text-soft: #6b6b6b;
  --accent: #5b7cfa;
  --accent-soft: #eef1ff;
  --danger: #d9534f;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

.hidden { display: none !important; }

/* ---------- Login ---------- */
.login {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.login-card {
  width: 320px;
  text-align: center;
}
.login-card h1 {
  font-weight: 500;
  font-size: 28px;
  margin: 0 0 4px;
}
.sub {
  color: var(--text-soft);
  font-size: 14px;
  margin: 0 0 24px;
}
.login-card input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  margin-bottom: 12px;
  outline: none;
}
.login-card input:focus { border-color: var(--accent); }

/* ---------- Layout ---------- */
.app {
  height: 100%;
  display: flex;
  flex-direction: column;
}
.topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
}
.spacer { flex: 1; }
.topbar select {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  font-size: 14px;
  color: var(--text);
  outline: none;
  max-width: 220px;
}

.layout {
  flex: 1;
  display: flex;
  min-height: 0;
}

/* ---------- Chat ---------- */
.chat {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.msg {
  max-width: 720px;
  white-space: pre-wrap;
  word-wrap: break-word;
  padding: 12px 16px;
  border-radius: 14px;
  font-size: 15.5px;
}
.msg.user {
  align-self: flex-end;
  background: var(--accent-soft);
  color: var(--text);
}
.msg.assistant {
  align-self: flex-start;
  background: var(--panel);
  border: 1px solid var(--border);
}
.msg.system {
  align-self: center;
  color: var(--text-soft);
  font-size: 13.5px;
  text-align: center;
}
.msg code {
  background: #f0f0f0;
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.9em;
}

.inputbar {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  padding: 14px 24px 18px;
  border-top: 1px solid var(--border);
}
.inputbar textarea {
  flex: 1;
  resize: none;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 15px;
  outline: none;
  max-height: 200px;
}
.inputbar textarea:focus { border-color: var(--accent); }

/* ---------- Botones ---------- */
.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 9px 16px;
  font-size: 14px;
  cursor: pointer;
}
.btn:hover { opacity: 0.9; }
.btn.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn.ghost:hover { background: var(--panel); }
.btn.danger { background: transparent; color: var(--danger); border: 1px solid var(--danger); }
.btn.danger:hover { background: #fdf1f0; }

/* ---------- Sidebar ---------- */
.sidebar {
  width: 280px;
  border-left: 1px solid var(--border);
  background: var(--panel);
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.sidebar-head {
  padding: 14px 16px;
  font-weight: 500;
  font-size: 14px;
  color: var(--text-soft);
  border-bottom: 1px solid var(--border);
}
.conv-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
}
.conv {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 9px 10px;
  border-radius: 8px;
  cursor: pointer;
  color: var(--text);
}
.conv:hover { background: #f0f0f0; }
.conv.active { background: var(--accent-soft); }
.conv-title {
  flex: 1;
  font-size: 14px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.conv-actions { display: flex; gap: 2px; }
.icon-btn {
  border: none;
  background: transparent;
  cursor: pointer;
  color: var(--text-soft);
  font-size: 13px;
  padding: 2px 4px;
  border-radius: 5px;
}
.icon-btn:hover { background: #e2e2e2; color: var(--text); }

/* ---------- Modal ---------- */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}
.modal-card {
  background: #fff;
  border-radius: 14px;
  padding: 24px;
  width: 440px;
  max-width: 92vw;
  max-height: 90vh;
  overflow-y: auto;
}
.modal-card h2 {
  margin: 0 0 16px;
  font-weight: 500;
  font-size: 20px;
}
.field { margin-bottom: 12px; }
.field label {
  display: block;
  font-size: 13px;
  color: var(--text-soft);
  margin-bottom: 4px;
}
.field input, .field textarea, .field select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 14px;
  outline: none;
  background: #fff;
}
.field input:focus, .field textarea:focus, .field select:focus { border-color: var(--accent); }
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 18px;
}

.error { color: var(--danger); font-size: 13px; min-height: 18px; }

/* lista de proveedores en modal */
.prov-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 6px;
  border-bottom: 1px solid var(--border);
}
.prov-row .name { flex: 1; font-size: 14px; }
.prov-row .model { color: var(--text-soft); font-size: 12px; }
.prov-block {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px;
  margin-bottom: 10px;
}