:root {
  --bg: #f7f7f8;
  --panel: #ffffff;
  --sidebar: #171717;
  --sidebar-2: #2a2a2a;
  --text: #1f1f1f;
  --muted: #8e8e8e;
  --border: #e5e5e5;
  --accent: #10a37f;
  --accent-hover: #0e8f6c;
  --user-bubble: #f0f0f0;
  --danger: #d83b3b;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

/* ---------- login ---------- */
.login-body {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #1e1e1e 0%, #2a2a2a 100%);
}
.login-card {
  background: var(--panel); border-radius: 16px; padding: 40px 36px;
  width: 360px; max-width: 92vw; text-align: center;
  box-shadow: 0 20px 60px rgba(0,0,0,.4);
}
.login-logo { font-size: 44px; margin-bottom: 8px; }
.login-card h1 { font-size: 20px; font-weight: 600; }
.login-sub { color: var(--muted); font-size: 13px; margin: 6px 0 22px; }
.login-error {
  background: #fdeaea; color: var(--danger); padding: 8px 12px;
  border-radius: 8px; font-size: 13px; margin-bottom: 16px;
}
.login-success {
  background: #e7f6f1; color: var(--accent); padding: 8px 12px;
  border-radius: 8px; font-size: 13px; margin-bottom: 16px;
}
.login-input {
  width: 100%; padding: 12px 14px; font-size: 15px; border: 1px solid var(--border);
  border-radius: 10px; outline: none; transition: border-color .15s;
}
.login-input:focus { border-color: var(--accent); }
.login-btn {
  width: 100%; margin-top: 14px; padding: 12px; font-size: 15px; font-weight: 600;
  color: #fff; background: var(--accent); border: none; border-radius: 10px;
  cursor: pointer; transition: background .15s;
}
.login-btn:hover { background: var(--accent-hover); }
.login-btn:disabled {
  background: #aaa; cursor: not-allowed;
}
.login-foot { color: var(--muted); font-size: 12px; margin-top: 18px; }
.settings-card { width: 440px; }
.settings-input { margin-top: 10px; }
.settings-help {
  background: #f5f5f5; border: 1px solid var(--border); border-radius: 8px;
  color: var(--muted); font-size: 12px; line-height: 1.5; margin-bottom: 14px;
  padding: 10px 12px; text-align: left;
}
.settings-textarea {
  margin-top: 10px; min-height: 90px; resize: vertical; font-family: inherit;
}
.settings-paste-btn {
  background: transparent; border: 1px solid var(--border); border-radius: 8px;
  color: var(--muted); cursor: pointer; font-size: 12px; margin-top: 8px;
  padding: 7px 10px; width: 100%;
}
.settings-paste-btn:hover { border-color: var(--accent); color: var(--accent); }
.settings-detect {
  color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px;
  align-items: center; font-size: 12px; line-height: 1.4; margin-top: 8px;
  text-align: left;
}
.settings-detect.ok { color: var(--accent); }
.settings-detect-pill {
  border: 1px solid var(--border); border-radius: 999px; color: var(--muted);
  padding: 2px 7px;
}
.settings-detect-pill.ok {
  background: #e7f6f1; border-color: #bce5d8; color: var(--accent);
}
.settings-detect-pill.fail {
  background: #fdeaea; border-color: #f4bcbc; color: var(--danger);
}
.settings-server-status {
  color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px;
  align-items: center; font-size: 12px; line-height: 1.4; margin: 0 0 12px;
  text-align: left;
}
.settings-status-message {
  color: var(--danger); flex: 1 1 100%; overflow-wrap: anywhere;
}
.settings-link { color: var(--muted); text-decoration: none; }
.settings-link:hover { color: var(--text); }
.settings-test { margin-top: 14px; }
.settings-test-btn:disabled { background: #aaa; cursor: not-allowed; }
.settings-test-status { color: var(--muted); font-size: 12px; margin-top: 10px; min-height: 18px; }
.settings-clear-btn {
  background: transparent; border: none; color: var(--muted); cursor: pointer;
  font-size: 12px; margin-top: 12px; padding: 4px 0;
}
.settings-clear-btn:hover { color: var(--danger); }
.settings-test-image {
  display: block; max-width: 100%; max-height: 280px; margin-top: 10px;
  border-radius: 8px; border: 1px solid var(--border);
}
.settings-test-image:not([src]) { display: none; }

/* ---------- app layout ---------- */
.app { display: flex; height: 100vh; overflow: hidden; }

.sidebar {
  width: 260px; background: var(--sidebar); color: #ececec;
  display: flex; flex-direction: column; transition: width .2s, margin .2s;
  flex-shrink: 0;
}
.sidebar.collapsed { margin-left: -260px; }
.sidebar-head { padding: 12px; display: flex; gap: 8px; }
.new-btn {
  flex: 1; padding: 10px 12px; background: transparent; color: #ececec;
  border: 1px solid #555; border-radius: 8px; font-size: 14px; cursor: pointer;
  transition: background .15s;
}
.new-btn:hover { background: var(--sidebar-2); }
.collapse-btn {
  width: 36px; background: transparent; color: #ececec; border: 1px solid #555;
  border-radius: 8px; cursor: pointer; font-size: 14px;
}
.collapse-btn:hover { background: var(--sidebar-2); }
.conv-list { flex: 1; overflow-y: auto; padding: 6px 8px; }
.conv-item {
  padding: 10px 12px; border-radius: 8px; cursor: pointer; font-size: 13.5px;
  color: #d0d0d0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  display: flex; align-items: center; justify-content: space-between; gap: 6px;
}
.conv-item:hover { background: var(--sidebar-2); }
.conv-item.active { background: #353535; }
.conv-item .ci-title { flex: 1; overflow: hidden; text-overflow: ellipsis; }
.conv-item .ci-del {
  opacity: 0; background: none; border: none; color: #999; cursor: pointer;
  font-size: 15px; padding: 0 2px;
}
.conv-item:hover .ci-del { opacity: 1; }
.conv-item .ci-del:hover { color: #ff8080; }
.sidebar-foot {
  padding: 10px 14px; font-size: 12px; color: #888;
  border-top: 1px solid #333; display: flex; justify-content: space-between;
}
.logout-link { color: #888; text-decoration: none; }
.logout-link:hover { color: #ccc; }

.main { flex: 1; display: flex; flex-direction: column; min-width: 0; background: var(--bg); }
.topbar {
  height: 52px; border-bottom: 1px solid var(--border); background: var(--panel);
  display: flex; align-items: center; gap: 12px; padding: 0 16px;
}
.menu-btn {
  background: none; border: none; font-size: 20px; cursor: pointer; color: var(--text);
  display: none;
}
.topbar-title { font-weight: 600; font-size: 15px; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.model-tag {
  font-size: 11px; color: var(--accent); background: #e7f6f1;
  padding: 3px 8px; border-radius: 12px; font-weight: 500;
}

.messages { flex: 1; overflow-y: auto; padding: 20px 0; }
.message { max-width: 760px; margin: 0 auto; padding: 10px 20px; display: flex; gap: 14px; }
.msg-avatar {
  width: 30px; height: 30px; border-radius: 6px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; font-size: 15px;
}
.msg-avatar.user { background: #6e6e6e; color: #fff; }
.msg-avatar.bot { background: var(--accent); color: #fff; }
.msg-body { flex: 1; min-width: 0; }
.msg-role { font-size: 12px; font-weight: 600; color: var(--muted); margin-bottom: 4px; }
.msg-text { font-size: 15px; line-height: 1.6; white-space: pre-wrap; word-wrap: break-word; }
.msg-text.error { color: var(--danger); }

.msg-image-wrap { margin-top: 8px; position: relative; display: inline-block; max-width: 100%; }
.msg-image {
  max-width: 100%; max-height: 560px; border-radius: 12px; display: block;
  border: 1px solid var(--border); cursor: pointer; background: #fff;
}
.msg-image.loading { opacity: .55; animation: pulse 1.6s ease-in-out infinite; }
@keyframes pulse { 0%,100%{opacity:.45} 50%{opacity:.85} }
.msg-image-actions { margin-top: 6px; display: flex; gap: 8px; }
.img-action {
  font-size: 12px; color: var(--muted); background: #f0f0f0; border: none;
  padding: 4px 10px; border-radius: 12px; cursor: pointer;
}
.img-action:hover { background: #e2e2e2; color: var(--text); }
.msg-meta { font-size: 11px; color: var(--muted); margin-top: 6px; }

.typing { display: inline-flex; gap: 4px; align-items: center; padding: 6px 0; }
.typing span {
  width: 7px; height: 7px; border-radius: 50%; background: var(--muted);
  animation: blink 1.4s infinite both;
}
.typing span:nth-child(2){ animation-delay: .2s; }
.typing span:nth-child(3){ animation-delay: .4s; }
@keyframes blink { 0%,80%,100%{opacity:.2} 40%{opacity:1} }

.processing-status {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  max-width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  box-shadow: 0 1px 2px rgba(0,0,0,.03);
}
.processing-dots {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}
.processing-dots span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  animation: blink 1.4s infinite both;
}
.processing-dots span:nth-child(2) { animation-delay: .2s; }
.processing-dots span:nth-child(3) { animation-delay: .4s; }
.processing-copy { min-width: 0; }
.processing-title {
  font-size: 14px;
  line-height: 1.35;
}
.processing-sub {
  margin-top: 2px;
  font-size: 12px;
  color: var(--muted);
}

.empty {
  max-width: 560px; margin: 12vh auto 0; text-align: center; padding: 0 20px;
}
.empty-icon { font-size: 48px; margin-bottom: 12px; }
.empty h2 { font-size: 22px; font-weight: 600; margin-bottom: 6px; }
.empty p { color: var(--muted); font-size: 14px; margin-bottom: 22px; }
.empty-examples { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; }
.ex-chip {
  background: var(--panel); border: 1px solid var(--border); padding: 8px 14px;
  border-radius: 18px; font-size: 13px; cursor: pointer; transition: all .15s;
}
.ex-chip:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- composer ---------- */
.composer { border-top: 1px solid var(--border); background: var(--panel); padding: 10px 20px 14px; }
.composer-opts {
  max-width: 760px; margin: 0 auto 8px; display: flex; gap: 12px;
  align-items: center; font-size: 13px; color: var(--muted); flex-wrap: wrap;
}
.composer-opts label { display: flex; align-items: center; gap: 5px; }
.composer-opts select {
  padding: 4px 8px; border: 1px solid var(--border); border-radius: 6px;
  font-size: 13px; background: #fff; outline: none;
}
.composer-opts select option:disabled { color: #aaa; }
.model-config-link {
  color: var(--muted); font-size: 12px; text-decoration: none;
  border-bottom: 1px solid transparent;
}
.model-config-link:hover { color: var(--accent); border-bottom-color: var(--accent); }
.upload-preview { display: flex; gap: 6px; flex: 1; justify-content: flex-end; }
.upload-preview img {
  height: 44px; border-radius: 6px; border: 1px solid var(--border); cursor: pointer;
}
.upload-preview .up-del {
  position: relative; display: inline-block;
}
.upload-preview .up-del button {
  position: absolute; top: -6px; right: -6px; width: 18px; height: 18px;
  border-radius: 50%; background: #000; color: #fff; border: none; font-size: 11px;
  cursor: pointer; line-height: 1;
}
.composer-form {
  max-width: 760px; margin: 0 auto; display: flex; align-items: flex-end;
  gap: 8px; background: var(--bg); border: 1px solid var(--border);
  border-radius: 16px; padding: 8px 10px;
}
.attach-btn, .send-btn {
  background: none; border: none; font-size: 20px; cursor: pointer;
  padding: 6px 8px; border-radius: 8px; color: var(--text);
}
.attach-btn:hover { background: var(--border); }
.send-btn { color: var(--accent); font-size: 18px; }
.send-btn:disabled { color: var(--muted); cursor: not-allowed; }
#promptInput {
  flex: 1; border: none; background: none; outline: none; resize: none;
  font-size: 15px; line-height: 1.5; max-height: 160px; padding: 6px 0;
  font-family: inherit;
}
.composer-hint { max-width: 760px; margin: 6px auto 0; font-size: 11px; color: var(--muted); text-align: center; }

/* lightbox */
.lightbox {
  position: fixed; inset: 0; background: rgba(0,0,0,.85); z-index: 1000;
  display: flex; align-items: center; justify-content: center; padding: 30px;
  cursor: zoom-out;
}
.lightbox img { max-width: 95%; max-height: 95%; border-radius: 8px; }

/* responsive */
@media (max-width: 760px) {
  .menu-btn { display: block; }
  .sidebar { position: fixed; z-index: 50; height: 100%; }
  .sidebar.collapsed { margin-left: -260px; }
}