:root {
  --background: #f5f7fa;
  --text: #142033;
  --text-secondary: #66758a;
  --text-tertiary: #8b98aa;
  --accent: #0a84ff;
  --accent-dark: #086ed3;
  --accent-soft: rgba(10, 132, 255, 0.1);
  --success: #21a366;
  --danger: #e5484d;
  --border: rgba(30, 58, 95, 0.1);
  --border-strong: rgba(30, 58, 95, 0.16);
  --shadow-soft: 0 8px 28px rgba(31, 51, 79, 0.07);
  --font-stack: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
}

[hidden] { display: none !important; }

* { box-sizing: border-box; }

html, body { min-height: 100%; }

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: var(--font-stack);
  -webkit-font-smoothing: antialiased;
}

button, input, textarea { font: inherit; }
button { color: inherit; }
button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 3px solid rgba(10, 132, 255, 0.24);
  outline-offset: 2px;
}

.assistant-shell { position: relative; min-height: 100vh; isolation: isolate; }

.ambient {
  position: fixed; z-index: -1; width: 460px; height: 460px;
  border-radius: 50%; opacity: 0.16; filter: blur(95px); pointer-events: none;
}
.ambient-one { top: -170px; left: 18%; background: #70b8ff; }
.ambient-two { right: -180px; bottom: -220px; background: #a5b9ff; }

/* 顶栏 */
.topbar {
  position: relative; z-index: 30;
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px; padding: 10px 18px;
  background: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(24px) saturate(145%);
  -webkit-backdrop-filter: blur(24px) saturate(145%);
}
.brand-lockup { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  display: grid; place-items: center; width: 40px; height: 40px;
  color: #fff; background: var(--accent); border-radius: 13px;
  font-size: 20px; box-shadow: 0 8px 22px rgba(10, 132, 255, 0.24);
}
.brand-lockup strong { display: block; font-size: 15px; letter-spacing: -0.01em; }
.brand-lockup span { display: block; margin-top: 3px; color: var(--text-tertiary); font-size: 12px; }
.topbar-actions { display: flex; align-items: center; gap: 10px; }
.permission-pill {
  display: flex; align-items: center; gap: 7px; min-height: 36px; padding: 0 12px;
  color: #506075; background: rgba(255, 255, 255, 0.58);
  border: 1px solid var(--border); border-radius: 999px; font-size: 13px;
}
.new-chat {
  display: flex; align-items: center; gap: 6px; min-height: 36px; padding: 0 13px;
  color: #fff; background: var(--accent); border: 0; border-radius: 999px;
  font-weight: 650; cursor: pointer; box-shadow: 0 8px 20px rgba(10, 132, 255, 0.22);
}
.new-chat:hover { background: var(--accent-dark); }

/* 会话列 */
.conversation-column {
  position: relative; min-height: calc(100vh - 64px); overflow-y: auto;
  scrollbar-width: thin; scrollbar-color: rgba(100, 120, 145, 0.22) transparent;
}
.conversation-heading {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  min-height: 64px; padding: 10px 26px;
  background: rgba(245, 247, 250, 0.78);
  border-bottom: 1px solid rgba(30, 58, 95, 0.06);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
}
.eyebrow { margin: 0 0 3px; color: var(--accent); font-size: 11px; font-weight: 750; letter-spacing: 0.09em; text-transform: uppercase; }
.conversation-heading h1 { margin: 0; font-size: 18px; letter-spacing: -0.025em; }
.conversation-heading p { margin: 3px 0 0; color: var(--text-tertiary); font-size: 12px; }
/* 消息区 */
.messages {
  width: min(100%, 820px); min-height: calc(100vh - 128px);
  margin: 0 auto; padding: 40px 30px 190px;
}

.welcome { text-align: center; padding: 40px 0 20px; }
.welcome-badge {
  display: grid; place-items: center; width: 56px; height: 56px; margin: 0 auto 18px;
  color: #fff; background: var(--accent); border-radius: 18px; font-size: 28px;
  box-shadow: 0 12px 30px rgba(10, 132, 255, 0.28);
}
.welcome h2 { margin: 0; font-size: 22px; letter-spacing: -0.02em; }
.welcome p { margin: 10px 0 22px; color: var(--text-secondary); font-size: 14px; }
.suggestions { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
.suggestion {
  padding: 10px 16px; color: var(--text-secondary); background: rgba(255, 255, 255, 0.8);
  border: 1px solid var(--border); border-radius: 999px; font-size: 13px; cursor: pointer;
}
.suggestion:hover { color: var(--accent-dark); border-color: rgba(10, 132, 255, 0.3); background: var(--accent-soft); }

.login-error { margin: 16px auto 0; max-width: 520px; padding: 12px 16px; color: var(--danger); background: rgba(229, 72, 77, 0.06); border: 1px solid rgba(229, 72, 77, 0.18); border-radius: 12px; font-size: 13px; }

.user-row { display: flex; justify-content: flex-end; margin-bottom: 30px; }
.user-message {
  max-width: min(72%, 620px); padding: 13px 17px;
  color: #fff; background: #1677ff; border-radius: 20px 20px 5px 20px;
  box-shadow: 0 10px 26px rgba(22, 119, 255, 0.18); line-height: 1.65;
}

.assistant-answer { display: grid; grid-template-columns: 42px minmax(0, 1fr); gap: 16px; }
.assistant-avatar {
  display: grid; place-items: center; width: 42px; height: 42px;
  color: #fff; background: var(--accent); border-radius: 14px; font-size: 19px;
}
.answer-content { min-width: 0; }
.answer-meta { display: flex; align-items: center; gap: 9px; min-height: 30px; margin-bottom: 10px; color: var(--text-secondary); font-size: 12px; }
.answer-meta strong { color: var(--text); font-size: 14px; }
.badge { padding: 4px 9px; border-radius: 999px; font-size: 11px; font-weight: 650; }
.badge.retrieving { color: #506075; background: #edf1f6; }
.badge.complete { color: var(--success); background: rgba(33, 163, 102, 0.08); }
.badge.error { color: var(--danger); background: rgba(229, 72, 77, 0.08); }

.answer-body {
  color: #34445a; font-size: 15px; line-height: 1.85;
  white-space: pre-wrap; word-break: break-word;
}
.answer-body .ref {
  display: inline-block; margin: 0 2px; padding: 0 5px; min-width: 18px;
  color: var(--accent-dark); background: var(--accent-soft);
  border-radius: 6px; font-size: 11px; font-weight: 750; text-align: center;
  line-height: 18px; vertical-align: 1px;
}
.answer-body strong { color: #142033; }
.answer-footer {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--border);
}
.footer-actions { display: flex; gap: 8px; }
.footer-actions button {
  padding: 6px 12px; color: var(--text-secondary); background: transparent;
  border: 1px solid var(--border); border-radius: 9px; font-size: 12px; cursor: pointer;
}
.footer-actions button:hover { color: var(--accent-dark); background: var(--accent-soft); border-color: rgba(10, 132, 255, 0.24); }
.footer-actions button:disabled { opacity: 0.6; cursor: default; }
.srcs {
  padding: 8px 16px; color: #fff; background: var(--accent);
  border: 0; border-radius: 999px; font-size: 13px; font-weight: 650; cursor: pointer;
  box-shadow: 0 6px 16px rgba(10, 132, 255, 0.28);
}
.srcs:hover { background: var(--accent-dark); }

/* 输入框 */
.composer {
  position: fixed; z-index: 20; right: 24px; bottom: 24px; left: 24px;
  width: min(calc(100% - 48px), 820px); margin: 0 auto;
  display: flex; flex-direction: column; gap: 8px; padding: 10px 14px;
  background: rgba(255, 255, 255, 0.85); border: 1px solid rgba(255, 255, 255, 0.72);
  border-radius: 26px; box-shadow: 0 18px 48px rgba(31, 51, 79, 0.12);
  backdrop-filter: blur(24px) saturate(145%); -webkit-backdrop-filter: blur(24px) saturate(145%);
}
.composer-row { display: flex; align-items: flex-end; gap: 8px; width: 100%; }
.composer-tools { display: flex; align-items: center; gap: 2px; }
.composer-icon {
  display: grid; place-items: center; width: 36px; height: 36px;
  color: var(--text-secondary); background: transparent; border: 0; border-radius: 50%;
  cursor: pointer; font-size: 18px;
}
.composer-icon:hover { color: var(--accent-dark); background: var(--accent-soft); }
.composer-icon.recording { color: #fff; background: var(--danger); }
.attachments { display: flex; flex-wrap: wrap; gap: 6px; }
.attach-chip {
  display: inline-flex; align-items: center; gap: 6px; max-width: 240px;
  padding: 5px 8px 5px 10px; color: var(--text-secondary);
  background: #f2f4f7; border: 1px solid var(--border); border-radius: 999px; font-size: 12px;
}
.attach-chip .attach-remove {
  display: grid; place-items: center; width: 18px; height: 18px;
  color: var(--text-tertiary); background: transparent; border: 0; border-radius: 50%;
  cursor: pointer; font-size: 11px; line-height: 1;
}
.attach-chip .attach-remove:hover { color: var(--danger); background: rgba(229, 72, 77, 0.1); }
.composer textarea {
  flex: 1; min-height: 30px; max-height: 120px; padding: 6px 2px;
  color: var(--text); background: transparent; border: 0; outline: 0;
  resize: none; line-height: 1.5; font-size: 15px;
}
.composer textarea::placeholder { color: var(--text-tertiary); }
.composer-actions { display: flex; align-items: center; gap: 10px; }
.composer-hint { color: var(--text-tertiary); font-size: 11px; white-space: nowrap; }
.send-button {
  display: grid; place-items: center; width: 42px; height: 42px;
  color: #fff; background: var(--accent); border: 0; border-radius: 50%;
  cursor: pointer; font-size: 17px; box-shadow: 0 8px 18px rgba(10, 132, 255, 0.22);
}
.send-button:hover { background: var(--accent-dark); }
.send-button:disabled { color: #8b99aa; background: #e4e9ef; box-shadow: none; cursor: not-allowed; }

/* 来源抽屉 */
.mobile-backdrop {
  position: fixed; inset: 0; z-index: 39; visibility: hidden;
  background: rgba(18, 30, 46, 0.28); opacity: 0;
  transition: opacity 180ms ease, visibility 180ms ease;
}
.mobile-backdrop.visible { visibility: visible; opacity: 1; }
.sources-panel {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 40;
  width: min(380px, 92vw); padding: 22px 18px;
  background: rgba(250, 251, 253, 0.96); border-left: 1px solid var(--border);
  transform: translateX(105%); transition: transform 220ms ease; overflow-y: auto;
}
.sources-panel.open { transform: translateX(0); }
.sources-heading { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.sources-heading h2 { margin: 0; font-size: 17px; letter-spacing: -0.02em; }
.mobile-close {
  display: grid; place-items: center; width: 34px; height: 34px;
  color: var(--text-secondary); background: #edf1f6; border: 0; border-radius: 50%; cursor: pointer;
}
.sources-intro { margin: 0 0 18px; color: var(--text-secondary); font-size: 12px; line-height: 1.65; }
.source-list { display: grid; gap: 12px; }
.source-card {
  display: flex; align-items: flex-start; gap: 12px; padding: 14px;
  background: rgba(255, 255, 255, 0.8); border: 1px solid var(--border); border-radius: 16px;
  box-shadow: 0 7px 22px rgba(31, 51, 79, 0.05);
}
.source-number {
  display: grid; place-items: center; flex: none; width: 28px; height: 28px;
  color: var(--accent-dark); background: var(--accent-soft); border-radius: 9px; font-size: 12px; font-weight: 750;
}
.source-card h3 { margin: 0; font-size: 13px; line-height: 1.5; }
.source-card p { margin: 5px 0 0; color: var(--text-secondary); font-size: 12px; line-height: 1.6; }
.source-card a { display: inline-block; margin-top: 7px; color: var(--accent); font-size: 12px; }
.sources-empty { margin: 0; color: var(--text-tertiary); font-size: 13px; }
.source-policy {
  margin-top: 20px; padding: 13px; color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.55); border: 1px dashed var(--border-strong);
  border-radius: 14px; font-size: 11px; line-height: 1.7;
}
.source-policy strong { display: block; color: var(--text); }

/* 登录页 */
.login-screen {
  position: fixed; inset: 0; z-index: 50; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(160deg, #eef4fb, #f5f7fa 55%, #eef1fb);
}
.login-card {
  width: min(360px, 92vw); padding: 32px 28px; background: #fff; border-radius: 20px;
  display: flex; flex-direction: column; align-items: center; text-align: center; gap: 12px;
  box-shadow: 0 24px 64px rgba(31, 51, 79, 0.16);
}
.login-brand {
  display: grid; place-items: center; width: 56px; height: 56px; border-radius: 18px;
  color: #fff; background: var(--accent); font-size: 28px;
  box-shadow: 0 12px 30px rgba(10, 132, 255, 0.28);
}
.login-card h2 { margin: 4px 0 0; font-size: 19px; letter-spacing: -0.01em; }
.login-sub { margin: 0; color: var(--text-secondary); font-size: 13px; }
.login-error-msg { margin: 0; color: var(--danger); font-size: 13px; }
.login-primary, .login-secondary, .login-dev-form button {
  width: 100%; height: 44px; border-radius: 12px; font-size: 15px; cursor: pointer; border: 0;
}
.login-primary { color: #fff; background: var(--accent); font-weight: 650; }
.login-primary:hover { background: var(--accent-dark); }
.login-primary:disabled { background: #a0c4ff; cursor: default; }
.login-hint { margin: 0; color: var(--text-tertiary); font-size: 12px; }
.login-divider {
  width: 100%; margin: 4px 0; color: var(--text-tertiary); font-size: 12px; position: relative;
}
.login-divider::before, .login-divider::after {
  content: ''; position: absolute; top: 50%; width: calc(50% - 24px); height: 1px; background: var(--border);
}
.login-divider::before { left: 0; }
.login-divider::after { right: 0; }
.login-secondary { color: var(--text-secondary); background: #f2f4f7; border: 1px solid var(--border); }
.login-secondary:hover { color: var(--accent-dark); background: var(--accent-soft); }
.login-dev-form { width: 100%; display: flex; gap: 8px; }
.login-dev-form input {
  flex: 1; height: 44px; padding: 0 12px; border: 1px solid var(--border-strong);
  border-radius: 12px; font-size: 14px; outline: none;
}
.login-dev-form input:focus { border-color: var(--accent); }
.login-dev-form button { width: 72px; color: #fff; background: var(--accent); }
.login-dev-form button:hover { background: var(--accent-dark); }

/* 移动端 */
@media (max-width: 720px) {
  .topbar { min-height: 56px; padding: 8px 12px; }
  .brand-lockup span, .permission-pill { display: none; }
  .brand-mark { width: 36px; height: 36px; font-size: 18px; }
  .new-chat span { display: none; }
  .new-chat { width: 36px; justify-content: center; padding: 0; }
  .conversation-column { min-height: calc(100vh - 56px); }
  .conversation-heading { min-height: 56px; padding: 8px 14px; }
  .messages { padding: 24px 14px 170px; }
  .welcome h2 { font-size: 19px; }
  .user-message { max-width: 88%; }
  .assistant-answer { grid-template-columns: 34px minmax(0, 1fr); gap: 10px; }
  .assistant-avatar { width: 34px; height: 34px; font-size: 16px; border-radius: 11px; }
  .answer-footer { gap: 10px; }
  .footer-actions button { padding: 5px 9px; font-size: 11px; }
  .srcs { padding: 6px 13px; font-size: 12px; }
  .composer { right: 10px; bottom: max(10px, env(safe-area-inset-bottom)); left: 10px; width: auto; border-radius: 22px; }
  .composer-hint { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important; animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}