* { box-sizing: border-box; }

:root {
  color-scheme: light;
  --bg: #f6f8ff;
  --bg2: #ffffff;
  --text: #0b1220;
  --muted: rgba(11, 18, 32, 0.62);
  --surface: rgba(255, 255, 255, 0.78);
  --surface2: rgba(255, 255, 255, 0.62);
  --border: rgba(11, 18, 32, 0.14);
  --border2: rgba(11, 18, 32, 0.10);
  --input-bg: rgba(255, 255, 255, 0.80);
  --shadow: 0 18px 50px rgba(14, 25, 55, 0.10);
  --accent: #2f6bff;
  --accent2: #12b8ff;
  --btn-bg: linear-gradient(135deg, rgba(47, 107, 255, 0.18), rgba(18, 184, 255, 0.12));
  --btn-bg-hover: linear-gradient(135deg, rgba(47, 107, 255, 0.26), rgba(18, 184, 255, 0.18));
  --secondary-bg: rgba(11, 18, 32, 0.06);
  --secondary-bg-hover: rgba(11, 18, 32, 0.10);
  --focus: rgba(47, 107, 255, 0.45);
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #061327;
  --bg2: #0a1b33;
  --text: #e8eefc;
  --muted: rgba(232, 238, 252, 0.70);
  --surface: rgba(10, 27, 51, 0.68);
  --surface2: rgba(10, 27, 51, 0.52);
  --border: rgba(232, 238, 252, 0.14);
  --border2: rgba(232, 238, 252, 0.10);
  --input-bg: rgba(6, 19, 39, 0.62);
  --shadow: 0 22px 60px rgba(0, 0, 0, 0.42), 0 0 0 1px rgba(21, 214, 255, 0.06), 0 0 26px rgba(21, 214, 255, 0.08);
  --accent: #4a80ff;
  --accent2: #15d6ff;
  --btn-bg: linear-gradient(135deg, rgba(74, 128, 255, 0.24), rgba(21, 214, 255, 0.10));
  --btn-bg-hover: linear-gradient(135deg, rgba(74, 128, 255, 0.34), rgba(21, 214, 255, 0.16));
  --secondary-bg: rgba(255, 255, 255, 0.07);
  --secondary-bg-hover: rgba(255, 255, 255, 0.11);
  --focus: rgba(21, 214, 255, 0.40);
}

html[data-theme="pink"] {
  color-scheme: light;
  --bg: #fff6fb;
  --bg2: #fff;
  --text: #2a0f1f;
  --muted: rgba(42, 15, 31, 0.62);
  --surface: rgba(255, 255, 255, 0.82);
  --surface2: rgba(255, 255, 255, 0.66);
  --border: rgba(42, 15, 31, 0.14);
  --border2: rgba(42, 15, 31, 0.10);
  --input-bg: rgba(255, 255, 255, 0.86);
  --shadow: 0 18px 54px rgba(118, 24, 67, 0.12), 0 0 0 1px rgba(255, 77, 166, 0.10), 0 0 24px rgba(255, 77, 166, 0.10);
  --accent: #ff4da6;
  --accent2: #ff7bd1;
  --btn-bg: linear-gradient(135deg, rgba(255, 77, 166, 0.20), rgba(255, 123, 209, 0.18));
  --btn-bg-hover: linear-gradient(135deg, rgba(255, 77, 166, 0.28), rgba(255, 123, 209, 0.24));
  --secondary-bg: rgba(42, 15, 31, 0.06);
  --secondary-bg-hover: rgba(42, 15, 31, 0.10);
  --focus: rgba(255, 77, 166, 0.35);
}

html[data-theme="purple"] {
  color-scheme: light;
  --bg: #f6f1ff;
  --bg2: #ffffff;
  --text: #251438;
  --muted: rgba(37, 20, 56, 0.62);
  --surface: rgba(255, 255, 255, 0.82);
  --surface2: rgba(255, 255, 255, 0.66);
  --border: rgba(37, 20, 56, 0.14);
  --border2: rgba(37, 20, 56, 0.10);
  --input-bg: rgba(255, 255, 255, 0.88);
  --shadow: 0 18px 54px rgba(62, 24, 120, 0.14), 0 0 0 1px rgba(179, 90, 255, 0.10), 0 0 24px rgba(179, 90, 255, 0.10);
  --accent: #8b5cf6;
  --accent2: #c084fc;
  --btn-bg: linear-gradient(135deg, rgba(139, 92, 246, 0.18), rgba(192, 132, 252, 0.18));
  --btn-bg-hover: linear-gradient(135deg, rgba(139, 92, 246, 0.26), rgba(192, 132, 252, 0.24));
  --secondary-bg: rgba(37, 20, 56, 0.06);
  --secondary-bg-hover: rgba(37, 20, 56, 0.10);
  --focus: rgba(139, 92, 246, 0.35);
}

html[data-theme="gold"] {
  color-scheme: light;
  --bg: #fff9e8;
  --bg2: #ffffff;
  --text: #24180a;
  --muted: rgba(36, 24, 10, 0.62);
  --surface: rgba(255, 255, 255, 0.84);
  --surface2: rgba(255, 255, 255, 0.68);
  --border: rgba(36, 24, 10, 0.14);
  --border2: rgba(36, 24, 10, 0.10);
  --input-bg: rgba(255, 255, 255, 0.88);
  --shadow: 0 18px 54px rgba(120, 84, 18, 0.14), 0 0 0 1px rgba(216, 170, 56, 0.12), 0 0 24px rgba(216, 170, 56, 0.12);
  --accent: #d8aa38;
  --accent2: #ffcc4d;
  --btn-bg: linear-gradient(135deg, rgba(216, 170, 56, 0.22), rgba(255, 204, 77, 0.18));
  --btn-bg-hover: linear-gradient(135deg, rgba(216, 170, 56, 0.30), rgba(255, 204, 77, 0.24));
  --secondary-bg: rgba(36, 24, 10, 0.06);
  --secondary-bg-hover: rgba(36, 24, 10, 0.10);
  --focus: rgba(216, 170, 56, 0.38);
}

html[data-theme="ocean"] {
  color-scheme: light;
  --bg: #eef6ff;
  --bg2: #ffffff;
  --text: #071a2f;
  --muted: rgba(7, 26, 47, 0.62);
  --surface: rgba(255, 255, 255, 0.82);
  --surface2: rgba(255, 255, 255, 0.66);
  --border: rgba(7, 26, 47, 0.14);
  --border2: rgba(7, 26, 47, 0.10);
  --input-bg: rgba(255, 255, 255, 0.88);
  --shadow: 0 18px 54px rgba(12, 74, 110, 0.14), 0 0 0 1px rgba(56, 189, 248, 0.10), 0 0 24px rgba(56, 189, 248, 0.12);
  --accent: #1d4ed8;
  --accent2: #38bdf8;
  --btn-bg: linear-gradient(135deg, rgba(29, 78, 216, 0.18), rgba(56, 189, 248, 0.18));
  --btn-bg-hover: linear-gradient(135deg, rgba(29, 78, 216, 0.26), rgba(56, 189, 248, 0.24));
  --secondary-bg: rgba(7, 26, 47, 0.06);
  --secondary-bg-hover: rgba(7, 26, 47, 0.10);
  --focus: rgba(56, 189, 248, 0.40);
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: radial-gradient(1000px 560px at 12% -10%, rgba(47, 107, 255, 0.16), transparent 60%),
              radial-gradient(900px 520px at 88% 0%, rgba(18, 184, 255, 0.12), transparent 62%),
              linear-gradient(180deg, var(--bg), var(--bg2));
  color: var(--text);
}

body::before { content: none; }

html[data-theme="dark"] body {
  background: radial-gradient(1100px 720px at 18% -12%, rgba(74, 128, 255, 0.22), transparent 60%),
              radial-gradient(980px 640px at 92% 0%, rgba(21, 214, 255, 0.14), transparent 62%),
              radial-gradient(1200px 720px at 70% 110%, rgba(74, 128, 255, 0.10), transparent 62%),
              linear-gradient(180deg, var(--bg), var(--bg2));
}

html[data-theme="pink"] body {
  background: radial-gradient(980px 620px at 14% -10%, rgba(255, 77, 166, 0.18), transparent 60%),
              radial-gradient(880px 580px at 88% 0%, rgba(255, 123, 209, 0.16), transparent 62%),
              radial-gradient(1200px 720px at 64% 110%, rgba(255, 77, 166, 0.10), transparent 62%),
              linear-gradient(180deg, var(--bg), var(--bg2));
}

html[data-theme="purple"] body {
  background: radial-gradient(1120px 760px at 18% -12%, rgba(139, 92, 246, 0.18), transparent 60%),
              radial-gradient(980px 640px at 92% 0%, rgba(192, 132, 252, 0.16), transparent 62%),
              radial-gradient(1200px 720px at 70% 110%, rgba(139, 92, 246, 0.10), transparent 62%),
              linear-gradient(180deg, var(--bg), var(--bg2));
}

html[data-theme="gold"] body {
  background: radial-gradient(980px 640px at 14% -12%, rgba(216, 170, 56, 0.16), transparent 60%),
              radial-gradient(900px 600px at 90% 0%, rgba(255, 204, 77, 0.14), transparent 62%),
              radial-gradient(1200px 720px at 70% 110%, rgba(216, 170, 56, 0.10), transparent 62%),
              linear-gradient(180deg, var(--bg), var(--bg2));
}

html[data-theme="ocean"] body {
  background: radial-gradient(1040px 680px at 14% -12%, rgba(29, 78, 216, 0.14), transparent 60%),
              radial-gradient(940px 620px at 92% 0%, rgba(56, 189, 248, 0.16), transparent 62%),
              radial-gradient(1200px 720px at 72% 112%, rgba(29, 78, 216, 0.10), transparent 62%),
              linear-gradient(180deg, var(--bg), var(--bg2));
}

.app { min-height: 100vh; display: flex; flex-direction: column; }
.topbar { padding: 14px 18px; display: flex; justify-content: space-between; align-items: baseline; background: var(--surface2); border-bottom: 1px solid var(--border2); backdrop-filter: blur(10px); }
.topbarRight { display: flex; align-items: center; gap: 12px; }
.brand { font-size: 16px; font-weight: 650; }
.hint { font-size: 12px; color: var(--muted); }
.main { max-width: 1400px; width: 100%; margin: 0 auto; padding: 18px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 14px; box-shadow: var(--shadow); backdrop-filter: blur(10px); }
.cardTitle { font-size: 14px; font-weight: 650; margin-bottom: 10px; }
.row { display: flex; gap: 10px; align-items: center; }
.between { justify-content: space-between; }
.input { width: 100%; padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--input-bg); color: var(--text); }
.btn { padding: 10px 12px; border-radius: 10px; border: 1px solid var(--border); background: var(--btn-bg); color: var(--text); cursor: pointer; white-space: nowrap; transition: transform 0.06s ease, background 0.18s ease, border-color 0.18s ease; }
.btn:hover { background: var(--btn-bg-hover); border-color: color-mix(in oklab, var(--border) 70%, var(--accent) 30%); }
.btn:active { transform: translateY(1px); }
.btn.secondary { background: var(--secondary-bg); }
.btn.secondary:hover { background: var(--secondary-bg-hover); }
.btnSmall { padding: 8px 10px; border-radius: 10px; font-size: 12px; }
.list { margin-top: 12px; display: grid; gap: 10px; }
.item { padding: 10px 12px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface2); display: flex; justify-content: space-between; align-items: center; gap: 12px; backdrop-filter: blur(8px); }
.itemTitle { font-weight: 600; }
.itemMeta { font-size: 12px; color: var(--muted); margin-top: 4px; }
.muted { font-size: 12px; color: var(--muted); margin-top: 8px; }
.grid2 { display: grid; grid-template-columns: 1fr 1.2fr; gap: 12px; margin-top: 12px; }
@media (max-width: 980px) { .grid2 { grid-template-columns: 1fr; } }
.panel { border: 1px solid var(--border); border-radius: 12px; padding: 12px; background: var(--surface2); backdrop-filter: blur(10px); }
.panelTitle { font-size: 13px; font-weight: 650; margin-bottom: 10px; }
.chatLog { height: clamp(360px, 58vh, 820px); overflow: auto; resize: vertical; padding: 10px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface2); display: grid; gap: 10px; align-content: start; }
.bubble { padding: 10px 12px; border-radius: 12px; border: 1px solid var(--border); width: fit-content; max-width: 85%; }
.bubble.user { background: color-mix(in oklab, var(--accent) 18%, transparent); border-color: color-mix(in oklab, var(--accent) 34%, var(--border) 66%); justify-self: end; }
.bubble.bot { background: var(--surface); justify-self: start; }
.modalOverlay { position: fixed; inset: 0; background: rgba(0,0,0,0.55); display: flex; align-items: center; justify-content: center; padding: 18px; z-index: 9999; }
.modalBox { width: min(520px, 96vw); border-radius: 12px; border: 1px solid var(--border); background: color-mix(in oklab, var(--bg2) 90%, #000 10%); padding: 14px; box-shadow: var(--shadow); }
.modalMsg { white-space: pre-wrap; line-height: 1.5; }
.modalActions { justify-content: flex-end; margin-top: 12px; }
.tabs { display: flex; gap: 20px; border-bottom: 1px solid var(--border2); margin-bottom: 15px; }
.tab { padding: 10px 5px; cursor: pointer; color: color-mix(in oklab, var(--muted) 90%, var(--text) 10%); border-bottom: 2px solid transparent; transition: all 0.2s; }
.tab:hover { color: var(--text); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 650; }
.selected-doc { background: color-mix(in oklab, var(--accent) 14%, transparent) !important; border-color: color-mix(in oklab, var(--accent) 28%, var(--border) 72%) !important; }
.hidden { display: none; }

*:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

::selection { background: color-mix(in oklab, var(--accent) 34%, transparent); }

.chatLog::-webkit-scrollbar { width: 12px; height: 12px; }
.chatLog::-webkit-scrollbar-thumb { background: color-mix(in oklab, var(--muted) 35%, transparent); border-radius: 999px; border: 3px solid transparent; background-clip: content-box; }
.chatLog::-webkit-scrollbar-thumb:hover { background: color-mix(in oklab, var(--muted) 55%, transparent); border: 3px solid transparent; background-clip: content-box; }
.chatLog::-webkit-scrollbar-corner { background: transparent; }

html[data-theme="dark"] .topbar {
  background: color-mix(in oklab, var(--surface2) 88%, rgba(21, 214, 255, 0.06) 12%);
  border-bottom-color: color-mix(in oklab, var(--border2) 70%, rgba(21, 214, 255, 0.18) 30%);
}

html[data-theme="dark"] .card,
html[data-theme="dark"] .panel,
html[data-theme="dark"] .item,
html[data-theme="dark"] .chatLog {
  border-color: color-mix(in oklab, var(--border) 65%, rgba(21, 214, 255, 0.22) 35%);
  box-shadow: 0 18px 54px rgba(0, 0, 0, 0.40), 0 0 0 1px rgba(21, 214, 255, 0.06), 0 0 22px rgba(21, 214, 255, 0.08);
}

html[data-theme="dark"] .tab.active {
  text-shadow: 0 0 18px rgba(21, 214, 255, 0.22);
}

html[data-theme="pink"] .topbar {
  background: color-mix(in oklab, var(--surface2) 90%, rgba(255, 77, 166, 0.08) 10%);
  border-bottom-color: color-mix(in oklab, var(--border2) 70%, rgba(255, 77, 166, 0.22) 30%);
}

html[data-theme="pink"] .card,
html[data-theme="pink"] .panel,
html[data-theme="pink"] .item,
html[data-theme="pink"] .chatLog {
  border-color: color-mix(in oklab, var(--border) 65%, rgba(255, 77, 166, 0.22) 35%);
  box-shadow: 0 16px 52px rgba(118, 24, 67, 0.16), 0 0 0 1px rgba(255, 77, 166, 0.08), 0 0 20px rgba(255, 77, 166, 0.10);
}

html[data-theme="pink"] .tab.active {
  text-shadow: 0 0 18px rgba(255, 77, 166, 0.22);
}

html[data-theme="purple"] .topbar {
  background: color-mix(in oklab, var(--surface2) 88%, rgba(179, 90, 255, 0.06) 12%);
  border-bottom-color: color-mix(in oklab, var(--border2) 70%, rgba(179, 90, 255, 0.20) 30%);
}

html[data-theme="purple"] .card,
html[data-theme="purple"] .panel,
html[data-theme="purple"] .item,
html[data-theme="purple"] .chatLog {
  border-color: color-mix(in oklab, var(--border) 65%, rgba(139, 92, 246, 0.22) 35%);
  box-shadow: 0 16px 52px rgba(62, 24, 120, 0.16), 0 0 0 1px rgba(139, 92, 246, 0.08), 0 0 20px rgba(139, 92, 246, 0.10);
}

html[data-theme="purple"] .tab.active {
  text-shadow: 0 0 18px rgba(179, 90, 255, 0.22);
}

html[data-theme="gold"] .topbar {
  background: color-mix(in oklab, var(--surface2) 90%, rgba(216, 170, 56, 0.08) 10%);
  border-bottom-color: color-mix(in oklab, var(--border2) 70%, rgba(216, 170, 56, 0.24) 30%);
}

html[data-theme="gold"] .card,
html[data-theme="gold"] .panel,
html[data-theme="gold"] .item,
html[data-theme="gold"] .chatLog {
  border-color: color-mix(in oklab, var(--border) 65%, rgba(216, 170, 56, 0.22) 35%);
  box-shadow: 0 16px 52px rgba(120, 84, 18, 0.18), 0 0 0 1px rgba(216, 170, 56, 0.10), 0 0 20px rgba(216, 170, 56, 0.12);
}

html[data-theme="gold"] .tab.active {
  text-shadow: 0 0 18px rgba(216, 170, 56, 0.22);
}

html[data-theme="ocean"] .topbar {
  background: color-mix(in oklab, var(--surface2) 90%, rgba(56, 189, 248, 0.08) 10%);
  border-bottom-color: color-mix(in oklab, var(--border2) 70%, rgba(29, 78, 216, 0.22) 30%);
}

html[data-theme="ocean"] .card,
html[data-theme="ocean"] .panel,
html[data-theme="ocean"] .item,
html[data-theme="ocean"] .chatLog {
  border-color: color-mix(in oklab, var(--border) 65%, rgba(29, 78, 216, 0.20) 35%);
  box-shadow: 0 16px 52px rgba(12, 74, 110, 0.16), 0 0 0 1px rgba(56, 189, 248, 0.08), 0 0 20px rgba(56, 189, 248, 0.12);
}

html[data-theme="ocean"] .tab.active {
  text-shadow: 0 0 18px rgba(56, 189, 248, 0.22);
}

/* ============== 登录/注册页面样式 ============== */
.loginContainer {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.loginCard {
  width: 100%;
  max-width: 400px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 72px 28px 32px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
  position: relative;
}

.authThemeAction {
  position: absolute;
  top: 18px;
  right: 18px;
  display: flex;
  justify-content: flex-end;
  z-index: 1;
}

.loginHeader {
  text-align: center;
  margin-bottom: 28px;
}

.loginHeader h1 {
  font-size: 22px;
  font-weight: 650;
  margin: 0 0 8px 0;
  color: var(--text);
}

.loginForm {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.formGroup {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.formGroup label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
}

.loginBtn {
  width: 100%;
  padding: 12px;
  font-size: 15px;
  font-weight: 500;
  margin-top: 8px;
}

.loginFooter {
  text-align: center;
  margin-top: 12px;
  font-size: 13px;
}

.loginFooter .muted {
  margin: 0;
}

.link {
  color: var(--accent);
  text-decoration: none;
  margin-left: 4px;
}

.link:hover {
  text-decoration: underline;
}

.themeToggle {
  display: flex;
  justify-content: center;
  margin-top: 20px;
}

.error {
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(244, 67, 54, 0.15);
  color: #d32f2f;
  font-size: 13px;
  text-align: center;
}

.success {
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(76, 175, 80, 0.15);
  color: #2e7d32;
  font-size: 13px;
  text-align: center;
}

/* 暗色主题下的错误/成功提示 */
html[data-theme="dark"] .error {
  background: rgba(244, 67, 54, 0.22);
  color: #ff8a80;
}

html[data-theme="dark"] .success {
  background: rgba(76, 175, 80, 0.22);
  color: #a5d6a7;
}

@media (max-width: 640px) {
  .loginContainer {
    padding: 16px;
  }

  .loginCard {
    padding: 68px 20px 24px;
  }

  .authThemeAction {
    top: 14px;
    right: 14px;
  }
}