/* ========== 主题变量：浅紫（默认） ========== */
:root,
:root[data-theme="light-purple"] {
  --bg-0: #F4F1FB;          /* 页面底：浅紫白 */
  --bg-1: #FFFFFF;          /* 卡片底：纯白 */
  --bg-2: #EFEAFB;
  --primary: #7C5BE0;
  --btn-from: #8B7BF0;   /* 按钮渐变起：深紫 */
  --btn-mid: #A684F4;
  --btn-to: #C18BF5;     /* 按钮渐变止：亮粉紫 */
  --btn-glow: rgba(193,139,245,0.32);
  --primary-2: #7C5BE0;
  --primary-3: #9D80F1;
  --title-accent-1: #7C5BE0;   /* 主标题渐变（深紫，白天可读） */
  --title-accent-2: #B8860B;   /* 主标题渐变（暖金，白天可读） */
  --text-0: #2A2440;           /* 正文深色 */
  --text-1: #6B6385;
  --text-2: #1A1630;
  --bubble-ai: rgba(124,91,224,0.08);
  --bubble-ai-border: rgba(124,91,224,0.28);
  --bubble-user: rgba(184,134,11,0.10);
  --bubble-user-border: rgba(184,134,11,0.30);
  --ok: #1BA37A;
  --warn: #D84848;
  --gold: #B8860B;
  --field-bg: rgba(124,91,224,0.05);        /* 输入框/字段底色（白天） */
  --line: rgba(42,36,64,0.12);               /* 通用边框（白天深色细线） */
  --line-soft: rgba(42,36,64,0.08);
  --shadow-card: 0 8px 24px rgba(124,91,224,0.10), 0 1px 0 rgba(255,255,255,0.8) inset;
  --shadow-hover: 0 14px 36px rgba(124,91,224,0.18), 0 1px 0 rgba(255,255,255,0.9) inset;
}

* { box-sizing: border-box; }
html { color-scheme: light; }
html, body { margin: 0; padding: 0; background: var(--bg-0); color: var(--text-0); font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", Helvetica, Arial, sans-serif; }
button { cursor: pointer; }
a { color: var(--primary-2); }

/* ========== 顶部品牌区 ========== */
.topbar {
  display: flex; align-items: center; gap: 16px;
  padding: 18px 28px 22px;
  background: var(--bg-0);
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 220px; }
.brand .logo { width: 36px; height: 36px; }
.brand-title { font-size: 22px; font-weight: 700; letter-spacing: 1px; color: var(--text-2); }
.brand-sub { font-size: 12px; color: var(--text-1); letter-spacing: 0.5px; }
.top-slogan { flex: 1; text-align: center; font-size: 14px; color: var(--text-1); font-weight: 500; }
.top-actions { display: flex; align-items: center; gap: 10px; }

/* 历史按钮 */
.icon-btn {
  width: 38px; height: 38px; border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.08);
  background: rgba(255,255,255,0.04);
  color: var(--text-2); font-size: 16px;
  display: inline-flex; align-items: center; justify-content: center;
  transition: all .18s ease;
}
.icon-btn:hover { background: rgba(193,139,245,0.18); border-color: var(--primary-2); }
.icon-emoji { font-size: 16px; line-height: 1; }

/* 语言切换 2 按钮（桌面：小巧 pill，融入浅紫主题） */
.lang-switch { display: inline-flex; align-items: center; gap: 2px; padding: 3px; border: 1px solid rgba(255,255,255,0.10); border-radius: 999px; background: rgba(255,255,255,0.04); }
.lang-btn {
  padding: 5px 13px; font-size: 12px; line-height: 1; letter-spacing: 0.5px;
  border: none; border-radius: 999px; background: transparent; color: var(--text-1);
  cursor: pointer; transition: all .18s ease;
}
.lang-btn:hover { background: rgba(193,139,245,0.16); color: var(--text-2); }
.lang-btn.active { background: linear-gradient(95deg, var(--btn-from) 0%, var(--btn-mid) 50%, var(--btn-to) 100%); color: #fff; font-weight: 600; box-shadow: 0 2px 8px rgba(139,123,240,0.35); }
.legacy-lang-btn { display: none !important; }
.hidden { display: none !important; }

/* ========== Hero ========== */
.hero { max-width: 940px; margin: 56px auto 28px; padding: 0 28px; text-align: center; }
.hero-title {
  font-size: clamp(24px, 3.2vw, 34px);
  font-weight: 800; line-height: 1.35;
  background: linear-gradient(120deg, var(--title-accent-1), var(--title-accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  margin: 0 0 22px;
}
.hero-desc { display: flex; flex-direction: column; gap: 12px; font-size: 15px; color: var(--text-1); max-width: 720px; margin: 0 auto; line-height: 1.9; }
.hero-desc .hero-line { display: block; }
.hero-end { margin: 28px 0 0; font-size: 18px; font-weight: 700; color: var(--title-accent-2); letter-spacing: 1px; }

/* 额度小字：常驻，低调、给人安全感 */
.quota-tip {
  margin: 14px 0 0;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .5px;
  color: var(--text-2);
  text-align: center;
  user-select: none;
}
.quota-tip b { color: var(--title-accent-2); font-weight: 700; }
.quota-tip.low b { color: #d9534f; }

/* ========== 模式 Tab ========== */
.mode-tabs {
  display: flex; justify-content: center; gap: 60px;
  max-width: 1080px; margin: 24px auto 36px; padding: 0 28px;
}
.mode-tab-wrap { display: flex; flex-direction: column; align-items: center; gap: 12px; }
.mode-tab {
  padding: 12px 36px; font-size: 16px; font-weight: 500;
  letter-spacing: 1px;
  border: 1px solid var(--line); border-radius: 999px;
  background: transparent; color: var(--text-2);
  transition: all .2s ease;
}
.mode-tab.active {
  background: linear-gradient(95deg, var(--btn-from) 0%, var(--btn-mid) 50%, var(--btn-to) 100%);
  color: #1A1228; border-color: transparent; font-weight: 700;
  box-shadow: 0 4px 18px var(--btn-glow), inset 0 1px 0 rgba(255,255,255,0.22);
}
.mode-hint { font-size: 13px; color: var(--text-1); max-width: 420px; text-align: center; line-height: 1.7; }

/* 快捷生成面板 */
.quick-form { background: var(--bg-1); border-radius: 18px; padding: 32px; box-shadow: var(--shadow-card); }
.quick-title { font-size: 22px; font-weight: 800; color: var(--text-2); margin: 0 0 10px; }
.quick-desc { font-size: 14px; color: var(--text-1); margin: 0 0 24px; line-height: 1.7; }
.quick-form .chat-input { min-height: 104px; margin-bottom: 12px; }
/* 一键生成按钮与上方上传栏之间留更多呼吸 */
.quick-form #quickGenBtn { margin-top: 26px; }

/* ========== 面板 ========== */
.panel { max-width: 880px; margin: 0 auto; padding: 0 28px 40px; }
.panel.hidden { display: none; }

/* 全屏聊天：点右上角 ⛶ 进入，类似手机看视频的沉浸式 */
.panel:fullscreen { max-width: none; width: 100vw; height: 100vh; margin: 0; padding: 0 16px; overflow-y: auto; background: var(--bg-0); }
.panel:-webkit-full-screen { max-width: none; width: 100vw; height: 100vh; margin: 0; padding: 0 16px; overflow-y: auto; background: var(--bg-0); }
.panel:fullscreen .chat-intro,
.panel:fullscreen > .chat-room { max-width: 880px; margin-left: auto; margin-right: auto; }

/* 输入块 */
.chat-intro {
  background: var(--bg-1); border-radius: 16px;
  padding: 24px;
  box-shadow: var(--shadow-card);
  margin-bottom: 24px;
}
.chat-input, .reply-input, .chat-input textarea {
  width: 100%; min-height: 84px; padding: 16px;
  border-radius: 12px; border: 1px solid var(--line);
  background: var(--field-bg); color: var(--text-0);
  font-size: 15px; line-height: 1.6; resize: vertical; outline: none;
}
.chat-input:focus, .reply-input:focus { border-color: var(--primary-2); }
.intro-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 16px; gap: 12px; flex-wrap: wrap; }
.examples { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.example-chip {
  font-size: 12px; padding: 6px 12px;
  background: rgba(193,139,245,0.1);
  border: 1px solid rgba(193,139,245,0.25);
  color: var(--text-2); border-radius: 999px;
}
.example-chip:hover { background: rgba(193,139,245,0.2); }

/* 主按钮 */
.primary-btn {
  padding: 10px 24px; border: none; border-radius: 10px;
  background: linear-gradient(95deg, var(--btn-from) 0%, var(--btn-mid) 50%, var(--btn-to) 100%);
  color: #FFFFFF; font-weight: 500; font-size: 15px;
  letter-spacing: 1px;
  box-shadow: 0 4px 18px var(--btn-glow), inset 0 1px 0 rgba(255,255,255,0.22);
  transition: transform .15s ease, box-shadow .15s ease;
}
.primary-btn.wide { width: 100%; padding: 14px 0; font-size: 16px; }
.primary-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px var(--btn-glow), inset 0 1px 0 rgba(255,255,255,0.28); }
.primary-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }

.ghost-btn {
  padding: 9px 18px; border: 1px solid var(--line); border-radius: 10px;
  background: transparent; color: var(--text-2); font-size: 14px;
  letter-spacing: 0.5px;
  transition: all .18s ease;
}
.ghost-btn:hover { background: rgba(255,255,255,0.06); border-color: var(--primary-2); }
.ghost-btn.small { padding: 4px 10px; font-size: 12px; }

/* 多模态上传工具条：贴合格式工具栏，不引入新视觉 */
.upload-bar { display: flex; align-items: center; gap: 12px; margin-top: 6px; flex-wrap: wrap; }
.upload-bar .upload-btn { cursor: pointer; padding: 6px 14px; }
.upload-bar .upload-status { font-size: 12px; color: var(--text-3); }
.upload-bar .upload-status.err { color: #ff9b9b; }
.upload-bar .upload-status.ok { color: var(--primary-2); }

.neon-btn {
  padding: 14px 36px; font-size: 18px; font-weight: 800;
  border: none; border-radius: 14px;
  background: linear-gradient(120deg, var(--primary-2), var(--gold), var(--primary-3));
  background-size: 200% 100%;
  color: #1A1228; animation: neonShift 6s linear infinite;
  box-shadow: 0 8px 24px rgba(193,139,245,0.35);
  transition: transform .15s ease;
}
.neon-btn:hover { transform: translateY(-2px); }
@keyframes neonShift { from { background-position: 0% 50%; } to { background-position: 200% 50%; } }

/* ========== 聊天区 ========== */
.chat-room {
  background: var(--bg-1); border-radius: 16px; padding: 20px;
  box-shadow: var(--shadow-card);
}
.messages { display: flex; flex-direction: column; gap: 12px; }
.msg { max-width: 78%; padding: 12px 16px; border-radius: 14px; line-height: 1.7; font-size: 15px; }
.msg.ai {
  align-self: flex-start; background: var(--bubble-ai); color: var(--text-0);
  border: 1px solid var(--bubble-ai-border); border-top-left-radius: 4px;
}
.msg.user {
  align-self: flex-end; background: var(--bubble-user); color: var(--text-0);
  border: 1px solid var(--bubble-user-border); border-top-right-radius: 4px;
}
.msg.thinking { color: var(--text-1); font-style: italic; }
.search-note-msg { max-width: 78%; align-self: flex-start; padding: 0 4px; }
.search-note {
  display: inline-block; font-size: 12px; color: var(--text-1); opacity: 0.8;
  background: rgba(139,123,240,0.12); border: 1px solid rgba(139,123,240,0.25);
  border-radius: 10px; padding: 3px 10px; margin-top: -6px; letter-spacing: 0.3px;
}
.chat-footer { margin-top: 20px; display: flex; flex-direction: column; gap: 10px; }
.footer-actions { display: flex; gap: 10px; align-items: center; }
.reply-input { min-height: 64px; }

/* 总结卡 */
.summary-card {
  background: linear-gradient(135deg, rgba(193,139,245,0.15), rgba(255,217,109,0.1));
  border: 1px solid var(--bubble-ai-border); border-radius: 14px; padding: 16px; margin-top: 16px;
}
.summary-card .summary-title { font-weight: 700; font-size: 16px; color: var(--title-accent-1); margin-bottom: 8px; }

/* 打包按钮包装 */
.package-wrap { text-align: center; margin: 28px 0; display: flex; flex-direction: column; align-items: center; gap: 12px; }
.new-topic-btn { font-size: 14px; padding: 8px 20px; }
.en-toggle {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 18px; border: 1px solid var(--line); border-radius: 10px;
  background: transparent; color: var(--text-2); font-size: 14px; letter-spacing: 0.5px;
  cursor: pointer; user-select: none; transition: all .18s ease;
}
.en-toggle:hover { background: rgba(255,255,255,0.06); border-color: var(--primary-2); }
.en-toggle input { accent-color: var(--btn-mid); width: 15px; height: 15px; margin: 0; }

/* 中英切换条（与下方 result-tabs 视觉对齐） */
.lang-switch { display: flex; gap: 4px; margin-bottom: 12px; }
.lang-switch .lang-btn {
  flex: 1; padding: 10px 0; text-align: center; font-weight: 700;
  border: 1px solid rgba(255,255,255,0.08); border-radius: 10px;
  background: rgba(255,255,255,0.04); color: var(--text-1); font-size: 14px;
  cursor: pointer; transition: all 0.18s ease;
}
.lang-switch .lang-btn.active {
  background: linear-gradient(95deg, var(--btn-from) 0%, var(--btn-mid) 50%, var(--btn-to) 100%);
  color: #fff; border-color: transparent;
}

/* 结果区 */
.result-wrap { margin-top: 24px; }
.result-tabs { display: flex; gap: 4px; margin-bottom: 14px; }
.result-tabs .result-tab {
  flex: 1; padding: 10px 0; text-align: center; font-weight: 700;
  border: 1px solid rgba(255,255,255,0.08); border-radius: 10px;
  background: rgba(255,255,255,0.04); color: var(--text-1); font-size: 14px;
}
.result-tabs .result-tab.active {
  background: linear-gradient(120deg, var(--primary-2), var(--primary-3));
  color: #1A1228; border-color: transparent;
}
.result-body {
  background: var(--bg-1); border-radius: 14px; padding: 18px;
  box-shadow: var(--shadow-card);
  min-height: 240px;
}

/* 贴图 / 播客封面预览：把 1080×1620 的 canvas 等比缩放，别撑满整个结果面板 */
.podcast-audio {
  position: relative;
  z-index: 2;
  margin: 18px 0 8px;
  pointer-events: auto;
}
.podcast-audio audio {
  display: block;
  width: 100%;
  max-width: 540px;
  height: 44px;
  margin: 0 auto;
  pointer-events: auto;
  position: relative;
  z-index: 2;
}
.podcast-dl-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
}
.podcast-publish {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 14px;
}
.podcast-meta {
  flex: 1 1 auto;
  min-width: 0;
}
.podcast-pub-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-2);
  margin-bottom: 6px;
}
.podcast-pub-excerpt {
  font-size: 13px;
  color: var(--text-1);
  line-height: 1.6;
}
@media (max-width: 560px) {
  .podcast-publish { flex-direction: column; align-items: stretch; }
  .podcast-cover { margin: 0 auto 12px !important; }
}

.card-preview, .podcast-cover {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  margin: 0 auto 14px;
  padding: 6px 0;
}
.card-preview canvas, .podcast-cover canvas {
  width: 100%;
  max-width: 360px;
  height: auto !important;
  border-radius: 12px;
  box-shadow: var(--shadow-card);
  display: block;
  color-scheme: light;
  filter: none !important;
}
@media (min-width: 720px) {
  .card-preview canvas, .podcast-cover canvas { max-width: 420px; }
}
.podcast-cover {
  width: 360px;
  max-width: 90%;
  flex: 0 0 auto;
  padding: 0;
  margin: 0 16px 0 0;
}
.podcast-cover canvas {
  width: 360px !important;
  max-width: 100%;
  height: auto !important;
  border-radius: 12px;
}

/* 案例区 */
.cases { max-width: 1080px; margin: 36px auto; padding: 0 28px; }
.cases-head { display: flex; align-items: flex-end; justify-content: space-between; margin-bottom: 18px; gap: 16px; }
.cases-head > div { text-align: center; flex: 1; }
.section-title { font-size: 22px; font-weight: 800; margin: 0 0 4px; color: var(--text-2); }
.section-subtitle { font-size: 13px; color: var(--text-1); margin: 0; }

.text-btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; font-size: 13px; color: var(--text-1);
  border: 1px solid rgba(255,255,255,0.1); border-radius: 999px;
  background: rgba(255,255,255,0.03); white-space: nowrap;
  transition: all .18s ease;
}
.text-btn:hover { color: var(--text-2); background: rgba(201,169,248,0.12); border-color: var(--primary-2); }

.case-grid {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px;
}
@media (max-width: 960px) { .case-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 720px) { .case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

.case-card {
  background: var(--bg-1); border-radius: 14px; padding: 16px 18px;
  box-shadow: var(--shadow-card);
  cursor: pointer; transition: transform .2s ease, box-shadow .2s ease;
  position: relative; min-height: 96px;
  display: flex; flex-direction: column; justify-content: flex-start; gap: 8px;
}
.case-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.case-tag {
  display: inline-block; font-size: 11px; font-weight: 600;
  letter-spacing: 0.5px;
  padding: 2px 0;
  background: transparent; border: none; border-radius: 0; box-shadow: none;
  width: fit-content;
  /* 浅紫→浅金 文字渐变，带一点点渐变即可 */
  background-image: linear-gradient(100deg, var(--primary-2) 55%, var(--title-accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--primary-2);
}
.case-title { font-size: 16px; font-weight: 700; color: var(--text-0); margin: 0; }
.case-desc { font-size: 12px; color: var(--text-1); margin: 0; line-height: 1.5; }
.case-card.no-desc { background: linear-gradient(135deg, rgba(201,169,248,0.12), rgba(255,227,160,0.08)); border: 1px dashed rgba(201,169,248,0.35); }
.case-card.no-desc .case-desc { color: var(--title-accent-2); font-style: italic; }

/* 底部 */
.footer { max-width: 1080px; margin: 48px auto 32px; padding: 0 28px; text-align: center; }
.footer-end { font-size: 16px; color: var(--title-accent-2); font-weight: 700; margin: 0 0 12px; }
.footer-tip { font-size: 13px; color: var(--text-1); margin: 0 0 4px; }
.footer-ip { font-size: 12px; color: var(--text-1); opacity: 0.7; margin: 0; }
.footer-copy { font-size: 12px; color: var(--text-2); margin: 20px 0 0; letter-spacing: .5px; }
.footer-copy-sub { margin-top: 4px; opacity: 0.7; }

/* ========== 弹窗（分享 / 模板） ========== */
.modal {
  position: fixed; inset: 0; z-index: 50;
  display: flex; align-items: center; justify-content: center;
  background: rgba(0,0,0,0.55); backdrop-filter: blur(4px);
}
.modal.hidden { display: none; }
.modal-box {
  background: var(--bg-1); border-radius: 16px; padding: 22px;
  width: min(440px, 92vw);
  box-shadow: 0 16px 48px rgba(0,0,0,0.5);
}
.modal-box.template-box { width: min(720px, 95vw); max-height: 86vh; overflow: auto; display: flex; flex-direction: column; gap: 12px; }
.modal-head { display: flex; align-items: center; justify-content: space-between; }
.modal-title { font-size: 18px; font-weight: 800; margin: 0; color: var(--title-accent-1); }
.modal-desc { font-size: 13px; color: var(--text-1); margin: 0; }
.icon-close {
  background: transparent; border: none; color: var(--text-2); font-size: 22px; line-height: 1;
  padding: 4px 8px; border-radius: 8px;
}
.icon-close:hover { background: rgba(255,255,255,0.06); }
.share-url {
  width: 100%; padding: 10px 12px; border-radius: 10px;
  background: var(--field-bg); border: 1px solid var(--line); color: var(--text-0); font-size: 13px;
  margin: 14px 0;
}
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 14px; }

.template-samples { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }
.sample-chip {
  padding: 8px 12px; border-radius: 999px; font-size: 13px;
  background: rgba(255,217,109,0.10); border: 1px solid rgba(255,217,109,0.3); color: var(--title-accent-2);
}
.sample-chip:hover { background: rgba(255,217,109,0.2); }
.template-editor {
  width: 100%; min-height: 180px; padding: 14px;
  border-radius: 12px; border: 1px solid var(--line);
  background: var(--field-bg); color: var(--text-0);
  font-size: 15px; line-height: 1.7; resize: vertical; outline: none;
}
.template-editor:focus { border-color: var(--primary-2); }

/* ========== 抽屉：聊天历史 ========== */
.drawer { position: fixed; inset: 0; z-index: 40; }
.drawer.hidden { display: none; }
.drawer-mask { position: absolute; inset: 0; background: rgba(0,0,0,0.5); backdrop-filter: blur(2px); }
.drawer-panel {
  position: absolute; right: 0; top: 0; bottom: 0;
  width: min(420px, 95vw);
  background: var(--bg-1); padding: 18px;
  display: flex; flex-direction: column; gap: 12px;
  box-shadow: -16px 0 36px rgba(0,0,0,0.5);
  animation: slideIn .25s ease;
}
@keyframes slideIn { from { transform: translateX(100%); } to { transform: translateX(0); } }
.drawer-head { display: flex; align-items: center; justify-content: space-between; }
.drawer-title { font-weight: 800; color: var(--title-accent-1); font-size: 16px; }
.drawer-tools { display: flex; align-items: center; gap: 10px; }
.history-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 10px; overflow-y: auto; flex: 1; }
.history-item {
  background: var(--field-bg); border-radius: 12px; padding: 12px;
  border: 1px solid var(--line-soft);
  display: flex; flex-direction: column; gap: 6px; position: relative;
}
.history-meta { display: flex; justify-content: space-between; align-items: center; gap: 6px; font-size: 11px; color: var(--text-1); flex-wrap: wrap; }
.history-title-line { font-weight: 700; color: var(--text-2); font-size: 14px; }
.history-preview { font-size: 12px; color: var(--text-1); line-height: 1.5; }
.history-pkg-badge {
  background: rgba(139,123,240,0.16); color: var(--title-accent-1, #8B7BF0);
  border: 1px solid rgba(139,123,240,0.3); border-radius: 8px;
  padding: 1px 7px; font-size: 11px; font-weight: 600; white-space: nowrap;
}
.history-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 2px; }
.history-del { align-self: flex-end; }
.history-empty { color: var(--text-1); text-align: center; padding: 30px 0; font-size: 14px; }

/* ========== 移动端 ========== */
@media (max-width: 720px) {
  /* topbar 保持横向（brand 左、actions 右），避免语言按钮被挤到主题下方 */
  .topbar {
    flex-direction: row; flex-wrap: wrap; align-items: center; justify-content: space-between;
    gap: 8px; padding: 12px 14px;
  }
  .brand { flex: 1 1 auto; min-width: 0; }
  .top-slogan { display: none; }  /* 窄屏隐藏中间标语，给按钮让位 */
  .top-actions { flex: 0 0 auto; gap: 6px; }
  /* 语言/主题按钮在手机端更紧凑小巧 */
  .lang-switch { border-radius: 999px; }
  .lang-switch .lang-btn { padding: 5px 12px; font-size: 12px; }
  .theme-switch { display: none; }  /* 手机端隐藏主题切换（v2 默认就是浅紫，少干扰） */
  .hero { margin: 24px auto 12px; padding: 0 18px; }
  .hero-title { font-size: 24px; }
  .hero-desc { font-size: 14px; }
  .mode-tabs { flex-direction: column; gap: 12px; }
  .case-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
}

/* ========== 意见反馈浮窗 ========== */
.feedback-fab {
  position: fixed; right: 22px; bottom: 22px; z-index: 60;
  display: flex; align-items: center; gap: 6px;
  padding: 11px 16px; border: none; border-radius: 999px; cursor: pointer;
  background: linear-gradient(135deg, #8B7BF0 0%, #A684F4 55%, #C18BF5 100%);
  color: #fff; font-size: 14px; font-weight: 500; letter-spacing: 1px;
  box-shadow: 0 8px 22px rgba(124, 91, 224, 0.35);
  transition: transform .15s ease, box-shadow .15s ease;
}
.feedback-fab:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(124, 91, 224, 0.45); }
.feedback-fab .feedback-fab-text { font-size: 13px; }

.feedback-box { max-width: 440px; }
.feedback-editor {
  width: 100%; box-sizing: border-box; margin-top: 12px; padding: 12px 14px;
  border: 1px solid #e3daf7; border-radius: 10px; font-size: 14px; resize: vertical;
  font-family: inherit; color: #333; background: #fbfaff;
}
.feedback-editor:focus { outline: none; border-color: #8B7BF0; background: #fff; }
.feedback-contact {
  width: 100%; box-sizing: border-box; margin-top: 10px; padding: 10px 14px;
  border: 1px solid #e3daf7; border-radius: 10px; font-size: 13px;
  font-family: inherit; color: #555; background: #fbfaff;
}
.feedback-contact:focus { outline: none; border-color: #8B7BF0; background: #fff; }
.feedback-msg { min-height: 18px; margin-top: 8px; font-size: 13px; }
.feedback-msg.ok { color: #2e9e5b; }
.feedback-msg.err { color: #e25555; }

@media (max-width: 560px) {
  .feedback-fab { right: 14px; bottom: 14px; padding: 10px 14px; }
  .feedback-fab .feedback-fab-text { display: none; }
  .feedback-box { max-width: 92vw; }
}

/* ========== 小微的信：全屏横线信纸 ========== */
.echo-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: linear-gradient(160deg, #f2eefa 0%, #e6dcf7 100%);
  display: flex; align-items: center; justify-content: center;
  padding: 28px 20px; overflow-y: auto;
  opacity: 0; transition: opacity .3s ease;
}
.echo-overlay.show { opacity: 1; }
.echo-paper {
  max-width: 960px; width: 100%; margin: auto;
  background: linear-gradient(180deg, #F4F1FB 0%, #FBF7EF 100%); /* 贴图同款：白色纸带一点浅紫 */
  border-radius: 14px; box-shadow: 0 26px 90px rgba(60,40,120,.22);
  padding: 52px 58px 44px; position: relative;
  animation: echoIn .45s cubic-bezier(.2,.9,.3,1.2);
}
@keyframes echoIn { from { transform: translateY(22px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
.echo-title {
  font-size: 26px; font-weight: 700; letter-spacing: 4px;
  text-align: center; margin: 0 0 42px; color: #7C5BE0; /* 紫色 */
}
.echo-paper-body { color: #2A2440; }
.echo-greet { font-size: 16px; color: #4a423f; margin-bottom: 24px; line-height: 1.9; }
.echo-sec { margin-bottom: 28px; }
.echo-sec-title {
  font-size: 13px; font-weight: 700; letter-spacing: 1px;
  margin: 0 0 8px; color: #7C5BE0;
}
.echo-body { font-size: 16px; line-height: 1.9; color: #4a423f; }
.echo-sign { margin-top: 34px; text-align: right; font-size: 15px; color: #4a423f; line-height: 1.8; }
.echo-paper-actions { display: flex; gap: 10px; justify-content: center; margin-top: 34px; flex-wrap: wrap; }
.echo-paper-actions .ghost-btn { border: 1px solid var(--line, #e4ddf3); background: rgba(255,255,255,.6); color: var(--text-1, #555); }
.echo-paper-actions .neon-btn { padding: 10px 22px; }

@media (max-width: 640px) {
  .echo-overlay { padding: 12px; align-items: flex-start; }
  .echo-paper { padding: 36px 22px 28px; border-radius: 14px; }
  .echo-title { font-size: 22px; margin-bottom: 36px; }
  .echo-body { font-size: 15px; line-height: 1.85; }
}