:root {
  --navy: #16162b;
  --navy-2: #20203c;
  --coral: #e94560;
  --coral-dark: #d4344e;
  --mid: #6b6b85;
  --bg: #f4f5fa;
  --card: #ffffff;
  --divider: #e4e5ef;
  --bg-cite: #eef0ff;
  --ok: #1f7a3d;
  --ok-bg: #e8f6ed;
  --warn: #b15c00;
  --shadow: 0 10px 35px rgba(22, 22, 43, .10);
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
  color: var(--navy);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
.hidden { display: none !important; }
.muted { color: var(--mid); }

.logo, .brand { font-weight: 800; letter-spacing: .3px; }
.logo span, .brand span { color: var(--coral); }

/* ---------- Login ---------- */
.login {
  min-height: 100%;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
  background:
    radial-gradient(1100px 500px at 50% -10%, #262648 0%, var(--navy) 55%) fixed;
}
.login-card {
  background: var(--card); border-radius: 18px; padding: 44px 42px;
  max-width: 430px; width: 100%; text-align: center; box-shadow: var(--shadow);
}
.login-card .logo { font-size: 26px; margin-bottom: 18px; }
.login-card h1 { font-size: 23px; line-height: 1.25; margin: 0 0 10px; }
.login-card .muted { margin: 0 0 26px; font-size: 15px; line-height: 1.5; }
.providers { display: flex; flex-direction: column; gap: 11px; }
.providers button {
  display: flex; align-items: center; justify-content: center; gap: 9px;
  padding: 13px 16px; border-radius: 11px; border: 1px solid var(--divider);
  background: #fff; font-size: 15px; cursor: pointer; font-weight: 600;
  color: var(--navy); transition: all .15s;
}
.providers button:hover { border-color: var(--coral); transform: translateY(-1px); }
.providers button.primary {
  background: var(--navy); color: #fff; border-color: var(--navy);
}
.providers button.primary:hover { background: var(--navy-2); }
.fineprint { margin: 22px 0 0; font-size: 12.5px; color: var(--mid); }

/* ---------- App layout ---------- */
.app { height: 100%; display: flex; flex-direction: column; }
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--navy); color: #fff; padding: 12px 20px; flex: none;
}
.topbar .brand { font-size: 17px; }
.top-actions { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.tenant-select {
  padding: 7px 11px; border-radius: 9px; border: 1px solid rgba(255,255,255,.18);
  background: var(--navy-2); color: #fff; font-size: 13.5px; cursor: pointer; max-width: 230px;
}
.user-chip {
  padding: 6px 11px; border-radius: 999px; background: rgba(255,255,255,.10);
  font-size: 13px; max-width: 220px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.btn-ghost {
  background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.30);
  border-radius: 9px; padding: 7px 13px; cursor: pointer; font-size: 13.5px;
  text-decoration: none; display: inline-flex; align-items: center; line-height: 1;
}
.btn-ghost:hover { background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.55); }

.workspace {
  flex: 1; min-height: 0; width: 100%; max-width: 920px; margin: 0 auto;
  display: flex; flex-direction: column; padding: 18px 20px 0;
}

/* ---------- Uploader ---------- */
.uploader { flex: none; margin-bottom: 14px; }
.dropzone {
  border: 2px dashed var(--divider); border-radius: 14px; background: var(--card);
  padding: 18px 20px; display: flex; align-items: center; gap: 16px; cursor: pointer;
  transition: all .15s;
}
.dropzone:hover, .dropzone:focus { border-color: var(--coral); outline: none; }
.dropzone.drag { border-color: var(--coral); background: #fff5f7; }
.dz-icon {
  width: 44px; height: 44px; flex: none; border-radius: 12px; background: var(--bg-cite);
  color: var(--navy); display: flex; align-items: center; justify-content: center;
  font-size: 22px; font-weight: 700;
}
.dz-text { display: flex; flex-direction: column; gap: 2px; }
.dz-text b { font-size: 15px; }
.dz-text .muted { font-size: 13px; }

.upload-list { display: flex; flex-direction: column; gap: 8px; margin-top: 10px; }
.up-item {
  display: flex; align-items: center; gap: 10px; background: var(--card);
  border: 1px solid var(--divider); border-radius: 10px; padding: 10px 13px; font-size: 13.5px;
}
.up-item .nm { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.up-item .st { font-size: 12.5px; }
.up-item.run .st { color: var(--mid); }
.up-item.ok { border-color: #bfe6cb; background: var(--ok-bg); }
.up-item.ok .st { color: var(--ok); font-weight: 600; }
.up-item.err { border-color: #f3c6cd; background: #fdeef0; }
.up-item.err .st { color: var(--coral-dark); font-weight: 600; }
.spinner {
  width: 15px; height: 15px; border: 2px solid var(--divider); border-top-color: var(--coral);
  border-radius: 50%; animation: spin .8s linear infinite; flex: none;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Chat ---------- */
.chat { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.messages {
  flex: 1; overflow-y: auto; padding: 6px 2px 18px;
  display: flex; flex-direction: column; gap: 16px;
}
.empty { margin: auto; text-align: center; max-width: 420px; padding: 30px; }
.empty-icon { font-size: 40px; }
.empty h2 { margin: 10px 0 6px; font-size: 21px; }
.empty .muted { font-size: 14.5px; line-height: 1.5; }

.msg {
  max-width: 82%; padding: 13px 16px; border-radius: 15px; line-height: 1.5;
  white-space: pre-wrap; font-size: 14.5px; box-shadow: 0 1px 2px rgba(22,22,43,.04);
}
.msg.user {
  align-self: flex-end; background: var(--navy); color: #fff; border-bottom-right-radius: 4px;
}
.msg.bot { align-self: flex-start; background: var(--card); border: 1px solid var(--divider); border-bottom-left-radius: 4px; }
.msg.bot.error { border-color: var(--coral); background: #fdeef0; }

.cites { margin-top: 12px; border-top: 1px dashed var(--divider); padding-top: 9px; }
.cites .lbl { font-size: 10.5px; text-transform: uppercase; letter-spacing: .6px; color: var(--mid); margin-bottom: 5px; }
.cite {
  display: inline-block; margin: 0 6px 5px 0; padding: 4px 10px; font-size: 12px;
  background: var(--bg-cite); border-radius: 999px; cursor: pointer; color: var(--navy);
  border: 1px solid transparent; transition: all .12s;
}
.cite:hover { border-color: var(--coral); }

.ask { display: flex; gap: 10px; padding: 14px 0 18px; flex: none; }
.ask input {
  flex: 1; padding: 14px 16px; border-radius: 12px; border: 1px solid var(--divider);
  font-size: 15px; background: var(--card); outline: none;
}
.ask input:focus { border-color: var(--coral); }
.ask button {
  padding: 0 24px; border: none; background: var(--coral); color: #fff;
  border-radius: 12px; font-weight: 700; cursor: pointer; font-size: 15px;
}
.ask button:hover { background: var(--coral-dark); }
.ask button:disabled { opacity: .5; cursor: default; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%);
  background: var(--navy); color: #fff; padding: 11px 18px; border-radius: 10px;
  font-size: 14px; box-shadow: var(--shadow); z-index: 50;
}

@media (max-width: 560px) {
  .user-chip, .btn-ghost.viz-hide { display: none; }
  .workspace { padding: 14px 12px 0; }
  .msg { max-width: 92%; }
}