/* ================= 基础 ================= */
* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  color-scheme: light;
  --bg: #eef1fb;
  --panel: #ffffff;
  --ink: #212638;
  --muted: #71788d;
  --border: #e4e7f2;
  --primary: #4f46e5;
  --primary-2: #7c3aed;
  --primary-soft: #eef0fe;
  --ok: #10b981;
  --warn: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 10px 30px rgba(31, 35, 60, .08);
  --radius: 14px;
  --soft: #f5f6fb;
  --soft-2: #fbfcff;
  --soft-3: #eef0f8;
  --code-bg: rgba(79, 70, 229, .08);
  --note-bg: #f0f2fb;
  --tip-bg: #fff8ea;
  --tip-border: #f5e3b8;
  --tip-ink: #8a6d1d;
  --err-bg: #fdeeee;
  --err-border: #f5c2c2;
  --err-ink: #b42323;
  --warn-bg: #fef3e2;
  --warn-border: #f5d9a8;
  --warn-ink: #92580c;
  --table-alt: #f7f8fd;
  --eq-bg: #f3f5ff;
  --eq-border: #c9cff2;
  --eq-ink: #34395e;
  --scroll-thumb: #c9cfe4;
  --scroll-thumb-hover: #aab2d0;
}

/* ================= 深色模式 ================= */
[data-theme="dark"] {
  --bg: #11131f;
  --panel: #1b2030;
  --ink: #e8eaf6;
  --muted: #9aa1bb;
  --border: #2e3450;
  --primary: #8f8bff;
  --primary-2: #a78bfa;
  --primary-soft: #252b45;
  --ok: #34d399;
  --warn: #fbbf24;
  --danger: #f87171;
  --shadow: 0 10px 30px rgba(0, 0, 0, .35);
  --soft: #242a41;
  --soft-2: #1b2030;
  --soft-3: #2a3150;
  --code-bg: rgba(143, 139, 255, .16);
  --note-bg: #232946;
  --tip-bg: #2f2813;
  --tip-border: #5c4a1d;
  --tip-ink: #e8c56e;
  --err-bg: #341d22;
  --err-border: #7a3a44;
  --err-ink: #f3a8b2;
  --warn-bg: #362a14;
  --warn-border: #6b5120;
  --warn-ink: #ecc079;
  --table-alt: #232946;
  --eq-bg: #232a47;
  --eq-border: #3a4270;
  --eq-ink: #c7ccf2;
  --scroll-thumb: #3a4160;
  --scroll-thumb-hover: #4a5275;
}
[data-theme="dark"] .progress-step.done { border-color: #2e5c4a; }
[data-theme="dark"] .round-item.done { border-color: #2e5c4a; }
[data-theme="dark"] .next-round-bar { background: linear-gradient(135deg, rgba(143, 139, 255, .10), rgba(167, 139, 250, .12)); }
[data-theme="dark"] .round-item.current { border-color: rgba(143, 139, 255, .45); }
[data-theme="dark"] .toast { background: #10131f; box-shadow: 0 10px 30px rgba(0, 0, 0, .5); }
[data-theme="dark"] .modal-overlay { background: rgba(5, 7, 15, .6); }
[data-theme="dark"] body {
  background:
    radial-gradient(1000px 500px at 85% -10%, rgba(124, 58, 237, .16), transparent 60%),
    radial-gradient(800px 400px at -10% 20%, rgba(79, 70, 229, .16), transparent 55%),
    var(--bg);
}
html, body { height: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  background:
    radial-gradient(1000px 500px at 85% -10%, rgba(124, 58, 237, .10), transparent 60%),
    radial-gradient(800px 400px at -10% 20%, rgba(79, 70, 229, .10), transparent 55%),
    var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}
button { font-family: inherit; cursor: pointer; }
input, textarea {
  color-scheme: light;
  font-family: inherit;
  color: var(--ink);
  caret-color: var(--ink);
}
input::placeholder, textarea::placeholder { color: var(--muted); opacity: 1; }
.hidden { display: none !important; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--scroll-thumb); border-radius: 8px; }
::-webkit-scrollbar-thumb:hover { background: var(--scroll-thumb-hover); }
::-webkit-scrollbar-track { background: transparent; }

#app {
  max-width: 1240px;
  margin: 0 auto;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: 12px 16px 16px;
  gap: 10px;
}

/* ================= 顶栏 ================= */
.topbar { display: flex; justify-content: space-between; align-items: center; padding: 4px 4px 0; }
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 44px; height: 44px; border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; box-shadow: 0 6px 16px rgba(79, 70, 229, .3);
}
.brand-text h1 { font-size: 20px; font-weight: 700; letter-spacing: .5px; }
.brand-text p { font-size: 12.5px; color: var(--muted); margin-top: 2px; }
.topbar-actions { display: flex; gap: 8px; }

/* ================= 按钮 ================= */
.btn {
  border: none; border-radius: 10px; padding: 9px 16px; font-size: 14px;
  transition: transform .15s, box-shadow .15s, background .15s, border-color .15s, color .15s;
  user-select: none;
}
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff; box-shadow: 0 6px 16px rgba(79, 70, 229, .28);
}
.btn.primary:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 8px 20px rgba(79, 70, 229, .36); }
.btn.primary:disabled { opacity: .6; cursor: not-allowed; }
.btn.ghost { background: var(--panel); border: 1px solid var(--border); color: var(--ink); }
.btn.ghost:hover { border-color: var(--primary); color: var(--primary); }
.btn.danger { background: var(--danger); color: #fff; }
.btn.danger:hover { background: #d63939; }
.btn.small { padding: 5px 10px; font-size: 12.5px; }
.btn.big { width: 100%; padding: 13px; font-size: 16px; margin-top: 14px; }
.danger-text { color: var(--danger); }
.send-btn { padding: 10px 22px; font-size: 15px; }
.send-btn.stop { background: var(--danger); box-shadow: 0 6px 16px rgba(239, 68, 68, .28); }

/* ================= 进度条 ================= */
.progress { display: flex; gap: 8px; }
.progress-step {
  flex: 1; display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 9px 10px; background: var(--panel); border-radius: 12px;
  border: 1px solid var(--border); font-size: 13px; color: var(--muted);
  transition: .15s;
}
.progress-step.locked { opacity: .55; cursor: not-allowed; }
.progress-step:not(.locked) { cursor: pointer; }
.progress-step:not(.locked):hover { border-color: var(--primary); color: var(--primary); }
.progress-step.done { border-color: #bbe9d6; color: var(--ok); }
.progress-step.current {
  border-color: var(--primary); color: var(--primary); font-weight: 600;
  box-shadow: 0 4px 14px rgba(79, 70, 229, .18);
}
.p-dot {
  width: 22px; height: 22px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--soft-3); color: var(--muted); font-size: 12px; font-weight: 700;
}
.progress-step.done .p-dot { background: var(--ok); color: #fff; }
.progress-step.current .p-dot { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; }

/* ================= 布局 ================= */
.layout { flex: 1; display: flex; gap: 14px; min-height: 0; }
.sidebar {
  width: 252px; flex-shrink: 0; display: flex; flex-direction: column;
  gap: 12px; overflow-y: auto; padding-bottom: 4px;
}
.chat-panel {
  flex: 1; display: flex; flex-direction: column;
  background: var(--panel); border-radius: 18px; box-shadow: var(--shadow);
  min-width: 0; overflow: hidden;
}

/* ================= 侧边栏 ================= */
.topic-card { background: var(--panel); border-radius: var(--radius); padding: 14px; box-shadow: var(--shadow); }
.topic-label { font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.topic-name { font-size: 16px; font-weight: 700; word-break: break-all; margin-bottom: 10px; }
.round-nav { background: var(--panel); border-radius: var(--radius); box-shadow: var(--shadow); padding: 8px; display: flex; flex-direction: column; gap: 4px; }
.round-item {
  display: flex; gap: 10px; align-items: center; width: 100%;
  padding: 10px; border-radius: 10px; border: 1px solid transparent;
  background: transparent; text-align: left; font-size: 14px; color: var(--ink);
  transition: .15s;
}
.round-item:not(.locked):hover { background: var(--primary-soft); }
.round-item.locked { opacity: .5; cursor: not-allowed; }
.round-item.current { background: var(--primary-soft); border-color: rgba(79, 70, 229, .35); }
.round-item.done { border-color: #d7efe5; }
.round-num {
  width: 26px; height: 26px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; background: var(--soft-3); color: var(--muted);
}
.round-item.done .round-num { background: var(--ok); color: #fff; }
.round-item.current .round-num { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; }
.r-title { display: block; font-weight: 600; font-size: 14px; }
.r-sub { display: block; font-size: 11.5px; color: var(--muted); margin-top: 2px; }
.sidebar-tip {
  background: var(--tip-bg); border: 1px solid var(--tip-border); color: var(--tip-ink);
  border-radius: var(--radius); padding: 12px 14px; font-size: 12.5px; line-height: 1.8;
}
.sidebar-tip strong { display: block; margin-bottom: 2px; }
.api-status {
  font-size: 12.5px; color: var(--muted); text-align: center; padding: 6px;
  cursor: pointer; background: var(--panel); border-radius: 10px; border: 1px solid var(--border);
}
.api-status.ok { color: var(--ok); }
.api-status.warn { color: var(--warn); }

/* ================= 侧边栏折叠 ================= */
.sidebar-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 0 2px; }
.sidebar-head-title { font-size: 13px; font-weight: 700; color: var(--muted); }
.icon-btn { padding: 4px 10px; font-size: 15px; line-height: 1.2; }
.layout.sidebar-hidden .sidebar { display: none; }
.sidebar-expand-btn { margin-right: 4px; flex-shrink: 0; }

/* ================= 聊天区 ================= */
.chat-header {
  display: flex; align-items: center; gap: 12px;
  padding: 16px 20px 12px; border-bottom: 1px solid var(--border);
}
.round-badge {
  width: 42px; height: 42px; border-radius: 12px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff; font-size: 18px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 6px 16px rgba(79, 70, 229, .3);
}
.chat-title { font-size: 16.5px; font-weight: 700; }
.chat-desc { font-size: 12.5px; color: var(--muted); margin-top: 3px; }

.messages { flex: 1; overflow-y: auto; padding: 18px 20px; }
.empty-chat { text-align: center; color: var(--muted); font-size: 14px; padding: 60px 0; }

.msg { display: flex; gap: 10px; margin-bottom: 16px; align-items: flex-start; }
.msg.user { flex-direction: row-reverse; }
.msg-avatar {
  width: 36px; height: 36px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center; font-size: 18px;
  background: var(--primary-soft);
}
.msg.user .msg-avatar { background: linear-gradient(135deg, var(--primary), var(--primary-2)); }
.msg-body { max-width: 78%; display: flex; flex-direction: column; gap: 4px; }
.msg.user .msg-body { align-items: flex-end; }
.msg-meta { display: flex; gap: 8px; align-items: center; font-size: 11.5px; color: var(--muted); }
.msg.user .msg-meta { flex-direction: row-reverse; }
.msg-content {
  background: var(--soft); border: 1px solid var(--border); border-radius: 14px;
  border-top-left-radius: 4px; padding: 12px 14px; font-size: 15px;
  line-height: 1.75; word-break: break-word;
}
.msg.user .msg-content {
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  color: #fff; border: none; border-radius: 14px; border-top-right-radius: 4px;
}
.msg-content p { margin: 6px 0; }
.msg-content h3, .msg-content h4, .msg-content h5 { margin: 10px 0 5px; line-height: 1.5; }
.msg-content ul, .msg-content ol { padding-left: 22px; margin: 6px 0; }
.msg-content li { margin: 3px 0; }
.msg-content blockquote {
  border-left: 3px solid var(--primary); background: var(--primary-soft);
  padding: 6px 12px; margin: 8px 0; border-radius: 0 8px 8px 0; color: var(--muted);
}
.msg-content hr { border: none; border-top: 1px dashed var(--border); margin: 10px 0; }
.msg-content a { color: var(--primary); }
.msg-content pre {
  background: #1f2433; color: #e6e9f5; padding: 10px 12px; border-radius: 10px;
  overflow-x: auto; font-size: 13px; margin: 8px 0; line-height: 1.6;
}
.msg-content code {
  background: var(--code-bg); color: var(--primary);
  padding: 1px 6px; border-radius: 6px;
  font-family: Consolas, Monaco, monospace; font-size: .9em;
}
.msg-content pre code { background: none; color: inherit; padding: 0; }
.msg.user .msg-content code { background: rgba(255, 255, 255, .2); color: #fff; }
.msg-copy {
  align-self: flex-start; border: none; background: none; color: var(--muted);
  font-size: 11.5px; padding: 2px 6px; border-radius: 6px; opacity: 0; transition: .15s;
}
.msg.user .msg-copy { align-self: flex-end; }
.msg:hover .msg-copy { opacity: .8; }
.msg-copy:hover { opacity: 1 !important; color: var(--primary); background: var(--primary-soft); }
.msg-tools { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.msg.user .msg-tools { justify-content: flex-end; }
.tts-btn {
  border: 1px solid var(--border); background: var(--panel); color: var(--muted);
  font-size: 11.5px; padding: 2px 8px; border-radius: 999px; cursor: pointer;
  transition: border-color .15s, color .15s, background .15s; user-select: none;
}
.tts-btn:hover { border-color: var(--primary); color: var(--primary); }
.tts-btn:disabled { opacity: .6; cursor: wait; }

.sys-note { text-align: center; margin: 6px 0 14px; font-size: 12.5px; color: var(--muted); }
.sys-note span {
  background: var(--note-bg); border: 1px dashed var(--border);
  padding: 5px 14px; border-radius: 999px; display: inline-block;
}

.typing { display: inline-flex; gap: 5px; padding: 5px 2px; }
.typing span {
  width: 7px; height: 7px; border-radius: 50%; background: var(--primary);
  animation: blink 1.2s infinite;
}
.typing span:nth-child(2) { animation-delay: .2s; }
.typing span:nth-child(3) { animation-delay: .4s; }
@keyframes blink {
  0%, 80%, 100% { opacity: .25; transform: translateY(0); }
  40% { opacity: 1; transform: translateY(-3px); }
}

.error-banner {
  margin: 0 20px 12px; background: var(--err-bg); border: 1px solid var(--err-border); color: var(--err-ink);
  border-radius: 12px; padding: 10px 14px; font-size: 13.5px; line-height: 1.7;
}

/* ================= 下一轮 ================= */
.next-round-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 10px 20px; font-size: 14px; color: var(--primary);
  background: linear-gradient(135deg, rgba(79, 70, 229, .07), rgba(124, 58, 237, .09));
  border-top: 1px solid var(--border);
}

/* ================= 输入区 ================= */
.composer { padding: 10px 16px 14px; border-top: 1px solid var(--border); }
.composer-hint { font-size: 12.5px; color: var(--muted); margin-bottom: 8px; line-height: 1.6; }
.composer-row { display: flex; gap: 10px; align-items: flex-end; }
.composer textarea {
  flex: 1; resize: none; border: 1.5px solid var(--border); border-radius: 12px;
  padding: 10px 14px; font-size: 15px; line-height: 1.5; outline: none;
  max-height: 160px; min-height: 44px; transition: border-color .15s, box-shadow .15s;
  background: var(--soft-2);
}
.composer textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, .12); background: var(--panel); }

/* ================= 弹窗 ================= */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(23, 25, 45, .45);
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center; z-index: 50; padding: 16px;
}
.modal {
  background: var(--panel); border-radius: 20px; padding: 26px 28px;
  width: 100%; max-width: 520px; max-height: 90vh; overflow-y: auto;
  box-shadow: 0 30px 60px rgba(0, 0, 0, .25);
  animation: pop .2s ease;
}
.modal.small { max-width: 400px; }
@keyframes pop { from { transform: scale(.95); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.modal-head h2 { font-size: 20px; margin-bottom: 6px; }
.modal-sub { color: var(--muted); font-size: 13.5px; margin-bottom: 18px; }
.chips-label { font-size: 12.5px; color: var(--muted); margin-bottom: 8px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.chip {
  border: 1.5px solid var(--border); background: var(--panel); border-radius: 999px;
  padding: 7px 14px; font-size: 14px; transition: .15s;
}
.chip:hover { border-color: var(--primary); color: var(--primary); }
.chip.active { border-color: var(--primary); background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.custom-topic input {
  width: 100%; border: 1.5px solid var(--border); border-radius: 12px;
  padding: 11px 14px; font-size: 15px; outline: none; transition: .15s;
  background: var(--soft-2);
}
.custom-topic input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, .12); }
.setup-warning {
  background: var(--warn-bg); border: 1px solid var(--warn-border); color: var(--warn-ink);
  border-radius: 12px; padding: 12px 14px; font-size: 13px; line-height: 1.8; margin-top: 12px;
}
.setup-warning code { background: var(--panel); padding: 1px 6px; border-radius: 6px; font-size: 12px; }
.confirm-text { color: var(--muted); font-size: 14px; line-height: 1.7; margin-top: 10px; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 22px; }

/* ================= Toast ================= */
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%);
  background: #232740; color: #fff; padding: 10px 22px; border-radius: 999px;
  font-size: 14px; box-shadow: 0 10px 30px rgba(0, 0, 0, .25); z-index: 100;
  opacity: 0; pointer-events: none; transition: opacity .25s, transform .25s;
  max-width: 90vw;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(-4px); }

/* ================= 错题本 ================= */
.mistake-btn { position: relative; }
.mistake-badge {
  position: absolute; top: -6px; right: -8px; min-width: 18px; height: 18px;
  border-radius: 999px; background: var(--danger); color: #fff;
  font-size: 11px; line-height: 18px; text-align: center; padding: 0 5px;
  box-shadow: 0 2px 8px rgba(239, 68, 68, .4);
}
.mistake-modal { max-width: 780px; }
.mistake-add-modal { max-width: 640px; }
.mistake-stats { font-size: 13px; color: var(--muted); margin-bottom: 10px; }
.mistake-filters { display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.mistake-filters .chip.active { border-color: var(--primary); background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.mistake-list { display: flex; flex-direction: column; gap: 10px; max-height: 56vh; overflow-y: auto; padding-right: 4px; }
.mistake-group-title {
  font-size: 12.5px; color: var(--primary); font-weight: 700; margin: 12px 0 6px;
  display: flex; align-items: center; gap: 8px;
}
.mistake-group-title::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.mistake-card { background: var(--soft-2); border: 1px solid var(--border); border-radius: 14px; padding: 12px 14px; }
.mistake-card-top { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; flex-wrap: wrap; }
.mistake-review-count { font-size: 12px; color: var(--muted); margin-left: auto; }
.tag { display: inline-block; border-radius: 999px; font-size: 11px; padding: 2px 10px; }
.tag-auto { background: var(--primary-soft); color: var(--primary); }
.tag-manual { background: var(--soft-3); color: var(--muted); }
.tag-mastered { background: rgba(16, 185, 129, .12); color: var(--ok); }
.tag-un { background: rgba(245, 158, 11, .14); color: var(--warn); }
.mistake-q { font-size: 14px; line-height: 1.7; white-space: pre-wrap; word-break: break-word; }
.mistake-actions { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
.mistake-empty { color: var(--muted); text-align: center; padding: 40px 0; font-size: 14px; line-height: 1.8; }

.mistake-form { display: flex; flex-direction: column; }
.mf-label { font-size: 12.5px; color: var(--muted); margin: 10px 0 6px; font-weight: 600; }
.mf-label .req { color: var(--danger); }
.mf-selects { display: flex; gap: 8px; flex-wrap: wrap; }
.mf-selects select {
  flex: 1 1 160px; min-width: 0; border: 1.5px solid var(--border); border-radius: 10px;
  padding: 9px 10px; font-size: 13.5px; background: var(--soft-2); color: var(--ink); outline: none;
}
.mf-selects select:focus { border-color: var(--primary); }
.mistake-form textarea {
  width: 100%; border: 1.5px solid var(--border); border-radius: 12px; padding: 10px 12px;
  font-size: 14px; line-height: 1.6; resize: vertical; outline: none;
  background: var(--soft-2); color: var(--ink);
}
.mistake-form textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, .12); }

.mr-back { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; flex-wrap: wrap; }
.mr-chapter { font-size: 12.5px; color: var(--primary); font-weight: 700; margin-bottom: 12px; }
.mr-field { margin-bottom: 14px; }
.mr-label { font-size: 12.5px; color: var(--muted); margin-bottom: 6px; font-weight: 600; }
.mr-question {
  font-size: 15px; line-height: 1.8; background: var(--soft-2); border: 1px solid var(--border);
  border-radius: 12px; padding: 12px 14px; white-space: pre-wrap; word-break: break-word;
}
.mr-answer {
  font-size: 14px; line-height: 1.7; background: var(--note-bg); border-radius: 12px;
  padding: 12px 14px; white-space: pre-wrap; word-break: break-word;
}
.mr-hidden { filter: blur(6px); user-select: none; transition: filter .2s; }
.mr-hidden.revealed { filter: none; user-select: auto; }
.mr-input {
  width: 100%; border: 1.5px solid var(--border); border-radius: 12px; padding: 10px 12px;
  font-size: 14px; line-height: 1.6; resize: vertical; outline: none; background: var(--soft-2); color: var(--ink);
}
.mr-input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, .12); }
.mr-btns { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 6px; }
.mr-ai { margin-top: 12px; border: 1px solid var(--border); border-radius: 12px; background: var(--soft-2); padding: 12px 14px; font-size: 14px; line-height: 1.8; word-break: break-word; }
.mr-ai-loading { color: var(--primary); }
.mr-ai-note { color: var(--muted); font-size: 13px; margin-top: 8px; }
.mistake-sync {
  margin-bottom: 12px; padding: 10px 12px; border: 1px dashed var(--border);
  border-radius: 12px; background: var(--soft-2);
}
.mistake-sync-status { font-size: 12.5px; color: var(--muted); margin-bottom: 6px; }
.mistake-sync-status.ok { color: var(--ok); }
.mistake-sync-status.warn { color: var(--warn); }
.mistake-sync-status.syncing { color: var(--primary); }
.mistake-sync-box { display: flex; gap: 8px; flex-wrap: wrap; }
.mistake-sync-box input {
  flex: 1 1 200px; min-width: 0; border: 1.5px solid var(--border); border-radius: 10px;
  padding: 8px 10px; font-size: 13.5px; outline: none; background: var(--soft-2); color: var(--ink);
}
.mistake-sync-box input:focus { border-color: var(--primary); }
.mistake-sync-info { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--ink); flex-wrap: wrap; }
/* ================= 响应式 ================= */
@media (max-width: 860px) {
  #app { padding: 8px 10px 12px; }
  .brand-text h1 { font-size: 16px; }
  .brand-text p { display: none; }
  .layout { flex-direction: column; }
  .sidebar { width: 100%; flex-direction: row; overflow-x: auto; gap: 8px; }
  .sidebar > * { flex-shrink: 0; }
  .topic-card { min-width: 190px; }
  .round-nav { flex-direction: row; }
  .round-item { white-space: nowrap; }
  .sidebar-tip { display: none; }
  .msg-body { max-width: 88%; }
  .progress-step .p-label { display: none; }
  .progress-step { padding: 8px 6px; }
  .topbar-actions { flex-wrap: wrap; justify-content: flex-end; }
  .topbar-actions .btn { padding: 8px 12px; font-size: 13px; }
}
/* ================= 总结报告（第五轮） ================= */
.summary { display: flex; flex-direction: column; gap: 16px; }
.summary-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; padding-bottom: 12px; border-bottom: 2px solid var(--primary-soft); flex-wrap: wrap; }
.summary-kicker { font-size: 12px; color: var(--primary); font-weight: 700; letter-spacing: 2px; }
.summary-title { font-size: 19px; font-weight: 800; margin-top: 4px; }
.summary-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.summary-sec { background: var(--soft-2); border: 1px solid var(--border); border-radius: 14px; padding: 14px 16px; }
.sec-title { font-size: 15px; font-weight: 700; margin-bottom: 12px; color: var(--ink); }
.sec-title::before { content: ''; display: inline-block; width: 4px; height: 14px; background: linear-gradient(180deg, var(--primary), var(--primary-2)); border-radius: 2px; margin-right: 8px; vertical-align: -2px; }

/* 思维导图 */
.mm { display: flex; flex-direction: column; align-items: center; }
.mm-root { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; font-weight: 700; font-size: 16px; padding: 10px 24px; border-radius: 12px; box-shadow: 0 6px 16px rgba(79, 70, 229, .25); }
.mm-stem { width: 2px; height: 14px; background: var(--border); }
.mm-body { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; width: 100%; margin-top: 4px; }
.mm-branch { flex: 1 1 175px; max-width: 230px; background: var(--panel); border: 1px solid var(--border); border-left: 4px solid var(--primary); border-radius: 10px; padding: 10px 12px; }
.mm-branch-title { font-weight: 700; font-size: 14px; color: var(--primary); margin-bottom: 8px; }
.mm-children { display: flex; flex-direction: column; gap: 6px; }
.mm-child { background: var(--primary-soft); border-radius: 8px; padding: 5px 9px; font-size: 13px; line-height: 1.5; }

/* 价态表 */
.val-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.val-table th { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; padding: 8px 10px; text-align: left; font-weight: 600; white-space: nowrap; }
.val-table th:first-child { border-radius: 8px 0 0 0; }
.val-table th:last-child { border-radius: 0 8px 0 0; }
.val-table td { padding: 7px 10px; border-bottom: 1px solid var(--border); }
.val-table tr:nth-child(even) td { background: var(--table-alt); }
.val-table tr:hover td { background: var(--primary-soft); }

.table-scroll { overflow-x: auto; }
.sum-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.sum-table th { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; padding: 7px 9px; text-align: left; font-weight: 600; white-space: nowrap; }
.sum-table td { padding: 6px 9px; border-bottom: 1px solid var(--border); }
.sum-table tr:nth-child(even) td { background: var(--table-alt); }
.sum-table tr:hover td { background: var(--primary-soft); }
/* 反应流程 */
.flow { margin-bottom: 14px; }
.flow:last-child { margin-bottom: 0; }
.flow-title { font-weight: 700; font-size: 14px; margin-bottom: 8px; }
.flow-steps { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 10px; }
.flow-step { background: var(--panel); border: 1.5px solid var(--primary); color: var(--primary); font-weight: 600; padding: 6px 12px; border-radius: 999px; font-size: 13.5px; }
.flow-arrow { color: var(--primary-2); font-weight: 800; font-size: 16px; }
.flow-eqs { display: flex; flex-direction: column; gap: 6px; }
.eq { background: var(--eq-bg); border: 1px dashed var(--eq-border); border-radius: 8px; padding: 6px 12px; font-family: Consolas, Monaco, monospace; font-size: 13px; color: var(--eq-ink); }


/* 方程式汇总（第五轮） */
.react-group { margin-bottom: 12px; }
.react-group:last-child { margin-bottom: 0; }
.react-cat { font-weight: 700; font-size: 13.5px; color: var(--primary); margin-bottom: 6px; padding-left: 10px; border-left: 3px solid var(--primary); }


/* 拍照识别（OCR） */
.ocr-panel { display: flex; gap: 12px; align-items: center; padding: 10px 16px; border-top: 1px solid var(--border); background: var(--soft-2); }
.ocr-panel img { max-width: 130px; max-height: 96px; border-radius: 8px; border: 1px solid var(--border); object-fit: contain; background: var(--panel); flex-shrink: 0; }
.ocr-actions { display: flex; align-items: center; gap: 8px; flex: 1; min-width: 0; }
.ocr-status { font-size: 12.5px; color: var(--muted); flex: 1; min-width: 0; line-height: 1.5; }
.ocr-btn { padding: 10px 12px; font-size: 14px; white-space: nowrap; }
@media print {
  .ocr-panel { display: none !important; }
}


/* 摄像头拍照 */
.camera-modal { max-width: 560px; }
.camera-box {
  position: relative; background: #16181f; border-radius: 14px; overflow: hidden;
  aspect-ratio: 4 / 3; display: flex; align-items: center; justify-content: center;
}
.camera-box video { width: 100%; height: 100%; object-fit: cover; display: block; }
.camera-error {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 13.5px; text-align: center; padding: 18px; line-height: 1.7;
  background: rgba(0, 0, 0, .6);
}
.camera-actions { display: flex; justify-content: center; gap: 10px; margin-top: 16px; flex-wrap: wrap; }

/* ================= 元素周期表 ================= */
.modal.wide { max-width: 1280px; }
.p-layout { display: flex; gap: 18px; align-items: flex-start; flex-wrap: wrap; }
.p-table-wrap { flex: 1 1 680px; min-width: 0; overflow-x: auto; }
.p-table { display: flex; flex-direction: column; gap: 3px; min-width: 660px; }
.p-row { display: grid; grid-template-columns: repeat(18, 1fr); gap: 3px; }
.p-row-head { margin-bottom: 2px; }
.p-group-num { text-align: center; font-size: 10px; color: var(--muted); padding: 3px 0; }
.p-cell {
  position: relative; border: 1px solid rgba(0,0,0,.08); border-radius: 6px;
  min-height: 46px; display: flex; flex-direction: column; align-items: center; justify-content: center;
  font-size: 11px; color: #1a1f33; cursor: pointer; transition: transform .12s, box-shadow .12s;
}
.p-cell:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,.18); z-index: 2; }
.p-num { font-size: 9px; opacity: .6; line-height: 1; }
.p-sym { font-weight: 700; font-size: 13px; line-height: 1.25; }
.p-empty { background: transparent !important; border: none !important; cursor: default; box-shadow: none !important; }
.p-cell.cat-alkali { background: #ffc7c7; }
.p-cell.cat-alkaline { background: #ffddb0; }
.p-cell.cat-transition { background: #ffe3b3; }
.p-cell.cat-postmetal { background: #d7e6b5; }
.p-cell.cat-metalloid { background: #bfe3f0; }
.p-cell.cat-nonmetal { background: #b8e6cd; }
.p-cell.cat-halogen { background: #c9dcff; }
.p-cell.cat-noble { background: #d5d0f5; }
.p-cell.cat-lanthanide { background: #f5c9e2; }
.p-cell.cat-actinide { background: #ecc0cf; }
.p-fblock { margin-top: 10px; min-width: 660px; }
.p-frow { display: grid; grid-template-columns: 44px repeat(15, 1fr); gap: 3px; margin-bottom: 3px; align-items: stretch; }
.p-fblock-label { font-size: 11px; color: var(--muted); display: flex; align-items: center; padding-right: 4px; }
.p-detail { flex: 0 0 300px; background: var(--soft-2); border: 1px solid var(--border); border-radius: 14px; padding: 16px; }
.p-detail-hint { color: var(--muted); font-size: 13px; }
.p-detail-head { display: flex; gap: 12px; align-items: center; margin-bottom: 14px; }
.p-detail-symbol {
  width: 58px; height: 58px; border-radius: 14px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff;
  font-size: 26px; font-weight: 800; display: flex; align-items: center; justify-content: center;
}
.p-detail-name { font-size: 18px; font-weight: 700; }
.p-detail-cat { font-size: 11px; color: var(--muted); font-weight: 400; }
.p-detail-sub { font-size: 12.5px; color: var(--muted); margin-top: 2px; }
.p-info-row { display: flex; gap: 10px; margin-bottom: 10px; font-size: 13px; line-height: 1.6; align-items: baseline; }
.p-info-label { flex: 0 0 74px; color: var(--muted); font-size: 12px; }
.p-info-val { flex: 1; word-break: break-all; }
.p-info-val sup { color: var(--primary); font-size: 10px; }
.p-bohr-wrap { text-align: center; }
.bohr-svg { width: 220px; max-width: 100%; height: auto; }
.bohr-ring { fill: none; stroke: var(--muted); stroke-width: 1; opacity: .5; }
.bohr-e { fill: #f59e0b; }
.bohr-nucleus { fill: var(--primary); }
.bohr-nucleus-text { fill: #fff; font-size: 12px; font-weight: 700; text-anchor: middle; dominant-baseline: middle; }
.bohr-label { fill: var(--muted); font-size: 9px; }

/* ================= 分子结构显示器 ================= */
.mol-tabs { display: flex; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; }
.mol-tab { border: 1.5px solid var(--border); background: var(--panel); color: var(--muted); border-radius: 999px; padding: 7px 16px; font-size: 13.5px; transition: .15s; }
.mol-tab:hover { border-color: var(--primary); color: var(--primary); }
.mol-tab.active { border-color: var(--primary); background: var(--primary-soft); color: var(--primary); font-weight: 600; }
.mol-form-row { display: flex; gap: 10px; margin-bottom: 12px; }
.mol-form-row input { flex: 1; min-width: 0; border: 1.5px solid var(--border); border-radius: 12px; padding: 10px 14px; font-size: 14px; outline: none; background: var(--soft-2); color: var(--ink); }
.mol-form-row input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,.12); }
.mol-result { min-height: 120px; }
.mol-loading { color: var(--muted); font-size: 14px; padding: 16px 4px; }
.mol-error { background: var(--err-bg); border: 1px solid var(--err-border); color: var(--err-ink); border-radius: 12px; padding: 12px 14px; font-size: 13.5px; }
.mol-multi-label { color: var(--muted); font-size: 13px; margin-bottom: 10px; }
.mol-choices { display: flex; flex-direction: column; gap: 8px; max-height: 220px; overflow-y: auto; }
.mol-choice { text-align: left; border: 1px solid var(--border); background: var(--panel); border-radius: 10px; padding: 9px 12px; font-size: 13.5px; transition: .15s; }
.mol-choice:hover { border-color: var(--primary); color: var(--primary); }
.mol-choice-cid { display: inline-block; background: var(--primary-soft); color: var(--primary); border-radius: 6px; font-size: 11px; padding: 1px 6px; margin-right: 8px; }
.mol-head { margin-bottom: 12px; }
.mol-name { font-size: 16px; font-weight: 700; }
.mol-meta { color: var(--muted); font-size: 12.5px; margin-top: 3px; }
.mol-body { display: flex; gap: 16px; flex-wrap: wrap; }
.mol-2d, .mol-3d { flex: 1 1 240px; min-width: 220px; }
.mol-sub-label { font-size: 12.5px; color: var(--muted); margin-bottom: 6px; }
.mol-2d img { width: 100%; max-width: 260px; border: 1px solid var(--border); border-radius: 12px; background: #fff; padding: 6px; }
.mol-3d-box { position: relative; height: 260px; border: 1px solid var(--border); border-radius: 12px; background: #fff; overflow: hidden; }
.mol-links { margin-top: 12px; display: flex; gap: 14px; font-size: 13px; flex-wrap: wrap; }
.mol-links a { color: var(--primary); text-decoration: none; }
.mol-hint { background: var(--note-bg); border-radius: 12px; padding: 10px 14px; font-size: 12.5px; line-height: 1.7; color: var(--muted); margin-bottom: 10px; }
.molview-frame { width: 100%; height: 56vh; min-height: 380px; border: 1px solid var(--border); border-radius: 12px; background: #fff; }

@media (max-width: 860px) {
  .p-layout { flex-direction: column; }
  .p-detail { flex: 1 1 auto; width: 100%; }
  .p-detail { max-width: 340px; }
  .molview-frame { height: 46vh; min-height: 300px; }
  .modal { padding: 18px 14px; }
}
/* 打印样式 */
@media print {
  :root, html { color-scheme: light !important; }
  * { -webkit-print-color-adjust: exact !important; print-color-adjust: exact !important; }
  body {
    background: #ffffff !important;
    color: #212638 !important;
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif !important;
  }
  .topbar, .progress, .sidebar, .chat-header, .composer, .next-round-bar, .error-banner,
  .sys-note, .msg.user, .msg-copy, .msg-meta, .msg-avatar, .msg-tools, .tts-btn, .summary-actions { display: none !important; }
  .sec-emoji { display: none !important; }
  .summary { gap: 14px; background: #ffffff !important; color: #212638 !important; }
  .summary-kicker { color: #4f46e5 !important; }
  .summary-title { color: #111827 !important; }
  .summary-sec { background: #fbfcff !important; border-color: #e4e7f2 !important; color: #212638 !important; }
  .sec-title { color: #111827 !important; }
  .sec-title::before { background: #4f46e5 !important; }
  .mm-root { background: #4f46e5 !important; color: #ffffff !important; box-shadow: none !important; }
  .mm-branch, .flow-step { background: #ffffff !important; border-color: #d7dcf0 !important; }
  .mm-branch-title { color: #4338ca !important; }
  .mm-child { background: #eef0fe !important; color: #212638 !important; }
  .mm-stem { background: #c7cbe8 !important; }
  .val-table th { background: #4f46e5 !important; color: #ffffff !important; }
  .val-table td { color: #212638 !important; border-bottom-color: #e4e7f2 !important; }
  .val-table tr:nth-child(even) td { background: #f7f8fd !important; }
  .val-table tr:hover td { background: #f7f8fd !important; }
  .flow-title { color: #111827 !important; }
  .flow-arrow { color: #6d28d9 !important; }
  .eq { background: #f3f5ff !important; border-color: #c9cff2 !important; color: #34395e !important; }
  .react-cat { color: #4338ca !important; }
  #app { height: auto; padding: 0; max-width: none; }
  .layout { display: block; }
  .chat-panel { box-shadow: none; border-radius: 0; }
  .messages { padding: 0; overflow: visible; }
  .msg { margin-bottom: 0; }
  .msg.assistant .msg-content { background: #fff; border: none; padding: 0; }
  .summary-sec, .flow { page-break-inside: avoid; }
}

/* ================= 教材目录 ================= */
.catalog-label { font-size: 12.5px; color: var(--muted); margin: 16px 0 8px; }
.catalog {
  max-height: 34vh; overflow-y: auto;
  border: 1.5px solid var(--border); border-radius: 14px;
  padding: 4px 12px 10px; background: var(--soft-2);
}
.catalog-book { border-bottom: 1px dashed var(--border); }
.catalog-book:last-child { border-bottom: none; }
.catalog-book summary {
  cursor: pointer; padding: 10px 2px 6px; font-size: 14.5px; font-weight: 600;
  color: var(--ink); list-style: none; user-select: none;
}
.catalog-book summary::-webkit-details-marker { display: none; }
.catalog-book summary::before { content: '▸ '; color: var(--primary); }
.catalog-book[open] summary::before { content: '▾ '; }
.catalog-chapter { padding: 2px 2px 9px; }
.catalog-chapter-title { font-size: 12.5px; color: var(--muted); margin: 3px 0 6px; }
.catalog-topics { display: flex; flex-wrap: wrap; gap: 6px; }
.chip.small { padding: 5px 11px; font-size: 13px; }