/* Bubbly 官网样式 —— 轻度新粗野主义（Soft Brutalism）：细黑描边、小硬投影、克制的色块点缀，主色 #ff5250 */
:root {
  --bub-red: #ff5250;
  --bub-red-dark: #e03d3b;
  --bub-yellow: #ffd23f;
  --bub-blue: #4f7cff;
  --bub-ink: #17181c;
  --bub-sub: #3f434b;
  --bub-bg: #fdf6ee;
  --bub-card: #ffffff;
  --bub-line: #17181c;
  --bub-border: 2px solid var(--bub-line);
  --bub-shadow: 4px 4px 0 var(--bub-line);
  --bub-shadow-sm: 2px 2px 0 var(--bub-line);
  --bub-radius: 10px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation: none !important; transition: none !important; }
}

body {
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC",
    -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  color: var(--bub-ink);
  background-color: var(--bub-bg);
  background-image: radial-gradient(rgba(23, 24, 28, 0.05) 1px, transparent 1px);
  background-size: 30px 30px;
  line-height: 1.75;
  font-size: 16px;
}

img { max-width: 100%; height: auto; display: block; }

.bub-wrap {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}
.bub-wrap-narrow { max-width: 860px; }

/* ---------- 页头 ---------- */
.bub-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bub-card);
  border-bottom: var(--bub-border);
}
.bub-header-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
  height: 66px;
  display: flex;
  align-items: center;
  gap: 28px;
}
.bub-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--bub-ink);
}
.bub-brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: var(--bub-border);
}
.bub-brand-name { font-size: 21px; font-weight: 800; letter-spacing: 0.2px; }

.bub-nav {
  display: flex;
  gap: 6px;
  margin-left: auto;
}
.bub-nav-link {
  padding: 7px 14px;
  border: 2px solid transparent;
  border-radius: 8px;
  text-decoration: none;
  color: var(--bub-ink);
  font-size: 15px;
  font-weight: 700;
  transition: border-color 0.15s, background-color 0.15s, box-shadow 0.15s;
}
.bub-nav-link:hover { border-color: var(--bub-line); background: #fff; box-shadow: var(--bub-shadow-sm); }
.bub-nav-link.bub-current {
  color: var(--bub-ink);
  background: var(--bub-yellow);
  border-color: var(--bub-line);
  box-shadow: var(--bub-shadow-sm);
}

.bub-header-cta {
  margin-left: 8px;
  padding: 9px 20px;
  border: var(--bub-border);
  border-radius: 10px;
  background: var(--bub-red);
  color: #fff;
  font-size: 15px;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: var(--bub-shadow-sm);
  transition: transform 0.12s, box-shadow 0.12s;
}
.bub-header-cta:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--bub-line); }
.bub-header-cta:active { transform: translate(3px, 3px); box-shadow: 0 0 0 var(--bub-line); }

.bub-menu-btn {
  display: none;
  border: var(--bub-border);
  border-radius: 8px;
  background: var(--bub-card);
  font-size: 24px;
  color: var(--bub-ink);
  cursor: pointer;
  margin-left: auto;
  padding: 4px 10px;
}

/* ---------- Hero ---------- */
.bub-hero { padding: 72px 0 76px; }
.bub-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
  gap: 52px;
  align-items: center;
}
.bub-h1 {
  display: inline-block;
  font-size: 56px;
  line-height: 1.1;
  font-weight: 800;
  text-wrap: balance;
  background: var(--bub-red);
  color: #fff;
  padding: 2px 18px 6px;
  border: var(--bub-border);
  border-radius: 12px;
  box-shadow: var(--bub-shadow);
}
.bub-hero-sub {
  font-size: 25px;
  font-weight: 800;
  margin-top: 26px;
  display: inline-block;
  background: var(--bub-yellow);
  padding: 2px 12px 4px;
  border: var(--bub-border);
  border-radius: 8px;
  box-shadow: var(--bub-shadow-sm);
}
.bub-hero-lead {
  margin-top: 22px;
  font-size: 17px;
  color: var(--bub-sub);
  max-width: 480px;
  font-weight: 600;
}
.bub-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 32px;
}
.bub-btn-main {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 30px;
  background: var(--bub-red);
  color: #fff;
  border: var(--bub-border);
  border-radius: 12px;
  font-size: 17px;
  font-weight: 800;
  text-decoration: none;
  box-shadow: var(--bub-shadow);
  transition: transform 0.12s, box-shadow 0.12s;
}
.bub-btn-main:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--bub-line); }
.bub-btn-main:active { transform: translate(4px, 4px); box-shadow: 1px 1px 0 var(--bub-line); }

.bub-hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
  list-style: none;
}
.bub-hero-tags li {
  padding: 6px 16px;
  border: var(--bub-border);
  border-radius: 999px;
  background: var(--bub-card);
  color: var(--bub-ink);
  font-size: 14px;
  font-weight: 800;
}
.bub-hero-tags li:nth-child(2n) { background: var(--bub-yellow); }
.bub-hero-tags li:nth-child(4n+3) { background: #cfe3ff; }

.bub-hero-visual {
  position: relative;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  min-height: 560px;
}
.bub-chat {
  width: 400px;
  background: var(--bub-card);
  border: var(--bub-border);
  border-radius: 16px;
  box-shadow: var(--bub-shadow);
  overflow: hidden;
}
.bub-chat-top {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: var(--bub-border);
  background: var(--bub-yellow);
}
.bub-chat-avatar {
  width: 38px;
  height: 38px;
  border: var(--bub-border);
  border-radius: 50%;
  overflow: hidden;
  background: #fff;
  flex: 0 0 auto;
}
.bub-chat-avatar img { display: block; width: 100%; height: 100%; object-fit: cover; }
.bub-chat-name { font-weight: 800; font-size: 16px; }
.bub-chat-status {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 800;
}
.bub-chat-status i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #2fbf71;
  border: 2px solid var(--bub-line);
}
.bub-chat-body {
  padding: 18px 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.bub-msg {
  max-width: 84%;
  margin: 0;
  padding: 10px 14px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.55;
  border: var(--bub-border);
}
.bub-msg-ta {
  align-self: flex-start;
  background: #fff;
  border-radius: 4px 14px 14px 14px;
}
.bub-msg-me {
  align-self: flex-end;
  background: var(--bub-red);
  color: #fff;
  border-radius: 14px 4px 14px 14px;
}
.bub-msg-yellow { background: var(--bub-yellow); }
.bub-msg-typing {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 13px 14px;
}
.bub-msg-typing i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bub-ink);
  animation: bubTyping 1.1s infinite;
}
.bub-msg-typing i:nth-child(2) { animation-delay: 0.18s; }
.bub-msg-typing i:nth-child(3) { animation-delay: 0.36s; }
@keyframes bubTyping {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.45; }
  30% { transform: translateY(-4px); opacity: 1; }
}
.bub-chat-foot {
  border-top: var(--bub-border);
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--bub-sub);
  background: var(--bub-bg);
}
@media (prefers-reduced-motion: no-preference) {
  .bub-chat-body .bub-msg { animation: bubPop 0.45s ease-out both; }
  .bub-chat-body .bub-msg:nth-child(1) { animation-delay: 0.05s; }
  .bub-chat-body .bub-msg:nth-child(2) { animation-delay: 0.22s; }
  .bub-chat-body .bub-msg:nth-child(3) { animation-delay: 0.39s; }
  .bub-chat-body .bub-msg:nth-child(4) { animation-delay: 0.56s; }
  .bub-chat-body .bub-msg:nth-child(5) { animation-delay: 0.73s; }
  .bub-chat-body .bub-msg:nth-child(6) { animation-delay: 0.95s; }
}
@keyframes bubPop { from { opacity: 0; } to { opacity: 1; } }
.bub-hero-dot {
  position: absolute;
  border: var(--bub-border);
  border-radius: 50%;
  background: var(--bub-yellow);
}
.bub-dot-a { width: 64px; height: 64px; top: -18px; left: 4%; }
.bub-dot-b { width: 34px; height: 34px; bottom: 12%; right: -10px; background: var(--bub-blue); }

/* ---------- 通用区块 ---------- */
.bub-sec-head { max-width: 640px; margin-bottom: 42px; }
.bub-h2 {
  display: inline-block;
  font-size: 31px;
  font-weight: 800;
  line-height: 1.35;
  background: linear-gradient(transparent 58%, var(--bub-yellow) 58%, var(--bub-yellow) 92%, transparent 92%);
  padding: 0 6px 2px 2px;
}
.bub-sec-sub { margin-top: 12px; color: var(--bub-sub); font-size: 16px; font-weight: 600; }
.bub-badge-official {
  display: inline-block;
  vertical-align: middle;
  margin-left: 12px;
  padding: 3px 12px 4px;
  font-size: 13px;
  font-weight: 800;
  line-height: 1.3;
  color: var(--bub-ink);
  background: var(--bub-blue);
  border: var(--bub-border);
  border-radius: 8px;
  box-shadow: var(--bub-shadow-sm);
}
.bub-h3 { font-size: 19px; font-weight: 800; line-height: 1.45; }

/* ---------- 产品画面 ---------- */
.bub-screens { padding: 76px 0; }
.bub-screens-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 34px;
  align-items: start;
}
.bub-screen-card {
  border: var(--bub-border);
  border-radius: 16px;
  overflow: hidden;
  background: var(--bub-card);
  box-shadow: var(--bub-shadow);
}
.bub-screen-card-mid { transform: translateY(-16px); }
.bub-screen-card img { width: 100%; height: auto; border-bottom: var(--bub-border); }
.bub-screen-card figcaption {
  padding: 16px 20px 18px;
  font-size: 14px;
  color: var(--bub-sub);
  background: var(--bub-card);
  font-weight: 600;
}
.bub-screen-card figcaption strong {
  display: inline-block;
  color: var(--bub-ink);
  font-size: 16px;
  margin-bottom: 2px;
  background: var(--bub-yellow);
  border: 2px solid var(--bub-line);
  border-radius: 6px;
  padding: 0 8px 1px;
  margin-right: 8px;
}
.bub-swipe-hint {
  display: none;
  margin-top: 16px;
  text-align: center;
  color: var(--bub-sub);
  font-size: 13px;
  font-weight: 700;
}

/* ---------- 核心功能 ---------- */
.bub-features {
  padding: 68px 0;
  background: var(--bub-card);
  border-top: var(--bub-border);
  border-bottom: var(--bub-border);
}
.bub-featurelist {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 48px;
}
.bub-featureitem {
  display: flex;
  gap: 18px;
  background: var(--bub-card);
  border: var(--bub-border);
  border-radius: 12px;
  padding: 20px 22px;
  box-shadow: var(--bub-shadow-sm);
}
.bub-feature-no {
  flex: none;
  font-size: 16px;
  font-weight: 800;
  color: #fff;
  background: var(--bub-red);
  border: 2px solid var(--bub-line);
  border-radius: 8px;
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-variant-numeric: tabular-nums;
}
.bub-featureitem .bub-h3 { padding-top: 2px; }
.bub-featureitem p { margin-top: 6px; color: var(--bub-sub); font-size: 15px; }

/* ---------- 使用场景 ---------- */
.bub-scenes { padding: 76px 0; }
.bub-scene-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.bub-scene {
  background: var(--bub-card);
  border: var(--bub-border);
  border-radius: 14px;
  padding: 26px 26px 28px;
  box-shadow: var(--bub-shadow);
  transition: transform 0.12s, box-shadow 0.12s;
}
.bub-scene:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--bub-line); }
.bub-scene:nth-child(1) .bub-scene-time { background: var(--bub-yellow); }
.bub-scene:nth-child(2) .bub-scene-time { background: #cfe3ff; }
.bub-scene:nth-child(3) .bub-scene-time { background: #ffd8cf; }
.bub-scene-time {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 800;
  color: var(--bub-ink);
  border: 2px solid var(--bub-line);
  border-radius: 999px;
  padding: 5px 14px;
  box-shadow: var(--bub-shadow-sm);
}
.bub-scene .bub-h3 { margin-top: 16px; }
.bub-scene p { margin-top: 8px; color: var(--bub-sub); font-size: 15px; }

/* ---------- FAQ ---------- */
.bub-faq {
  padding: 68px 0 76px;
  background: var(--bub-card);
  border-top: var(--bub-border);
  border-bottom: var(--bub-border);
}
.bub-faq-item {
  background: var(--bub-card);
  border: var(--bub-border);
  border-radius: 12px;
  margin-bottom: 14px;
  box-shadow: var(--bub-shadow-sm);
}
.bub-faq-item summary {
  list-style: none;
  cursor: pointer;
  padding: 17px 22px;
  font-size: 16px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.bub-faq-item summary::-webkit-details-marker { display: none; }
.bub-faq-item summary i {
  flex: none;
  width: 30px;
  height: 30px;
  border: 2px solid var(--bub-line);
  border-radius: 8px;
  background: var(--bub-red);
  color: #fff;
  font-size: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s;
}
.bub-faq-item[open] summary i { transform: rotate(45deg); background: var(--bub-ink); }
.bub-faq-item p {
  color: var(--bub-sub);
  font-size: 15px;
  border-top: 2px dashed rgba(23, 24, 28, 0.25);
  padding: 14px 22px 20px;
}

/* ---------- 用户反馈 ---------- */
.bub-reviews { padding: 76px 0; }
.bub-review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}
.bub-review {
  background: var(--bub-card);
  border: var(--bub-border);
  border-radius: 14px;
  padding: 22px 24px;
  box-shadow: var(--bub-shadow);
}
.bub-review:nth-child(4) { background: #fff8f0; }
.bub-review:nth-child(8) { background: #fff0ef; }
.bub-review-head {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}
.bub-avatar {
  flex: none;
  width: 42px;
  height: 42px;
  border-radius: 10px;
  border: 2px solid var(--bub-line);
  background: var(--bub-yellow);
  color: var(--bub-ink);
  font-size: 16px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--bub-shadow-sm);
}
.bub-review:nth-child(2n) .bub-avatar { background: #cfe3ff; }
.bub-review:nth-child(3n) .bub-avatar { background: #ffd8cf; }
.bub-review-name { display: block; font-size: 15px; font-weight: 800; line-height: 1.3; }
.bub-review-head time { font-size: 12px; color: #6b7078; font-weight: 600; }
.bub-stars {
  margin-left: auto;
  color: var(--bub-ink);
  font-size: 14px;
  display: inline-flex;
  gap: 1px;
}
.bub-stars .ri-star-fill { color: var(--bub-red); }
.bub-review p { color: var(--bub-sub); font-size: 15px; font-weight: 500; }

/* ---------- 最终行动区 ---------- */
.bub-download {
  padding: 76px 0;
  background: var(--bub-red);
  border-top: var(--bub-border);
  color: var(--bub-ink);
}
.bub-download-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 48px;
  align-items: center;
}
.bub-download .bub-h2 {
  color: #fff;
  background: linear-gradient(transparent 58%, var(--bub-ink) 58%, var(--bub-ink) 92%, transparent 92%);
  padding-bottom: 4px;
}
.bub-download-copy p { margin-top: 14px; font-size: 16px; color: #fff; font-weight: 700; max-width: 460px; }
.bub-download .bub-btn-main {
  margin-top: 30px;
  background: #fff;
  color: var(--bub-ink);
}
.bub-download-qr {
  background: var(--bub-card);
  border: var(--bub-border);
  border-radius: 16px;
  padding: 14px;
  text-align: center;
  box-shadow: var(--bub-shadow);
}
.bub-download-qr img { width: 168px; height: 168px; border-radius: 6px; border: 2px solid var(--bub-line); }
.bub-download-qr figcaption { margin-top: 10px; font-size: 13px; color: var(--bub-ink); font-weight: 800; }

/* ---------- 页脚 ---------- */
.bub-footer {
  border-top: var(--bub-border);
  padding: 28px 0;
  background: var(--bub-ink);
}
.bub-footer-inner {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.bub-footer img { width: 30px; height: 30px; border-radius: 7px; border: 2px solid #fff; }
.bub-footer-brand { font-size: 16px; font-weight: 800; color: #fff; }
.bub-footer-slogan { color: #b9bec7; font-size: 13px; font-weight: 600; }
.bub-footer-copy { margin-left: auto; color: #8b919b; font-size: 13px; }

/* ---------- 返回顶部 ---------- */
.bub-totop {
  position: fixed;
  right: 22px;
  bottom: 26px;
  width: 48px;
  height: 48px;
  border: var(--bub-border);
  border-radius: 12px;
  background: var(--bub-yellow);
  color: var(--bub-ink);
  font-size: 22px;
  font-weight: 800;
  cursor: pointer;
  box-shadow: var(--bub-shadow-sm);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s, transform 0.12s, box-shadow 0.12s;
  z-index: 40;
}
.bub-totop:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--bub-line); }
.bub-totop.bub-show { opacity: 1; visibility: visible; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .bub-h1 { font-size: 46px; }
  .bub-hero-visual { min-height: 500px; }
  .bub-chat { width: 360px; }
  .bub-screens-row { gap: 24px; }
  .bub-screen-card-mid { transform: translateY(-16px); }
}

@media (max-width: 900px) {
  .bub-nav, .bub-header-cta { display: none; }
  .bub-menu-btn { display: block; }
  .bub-header.bub-open .bub-nav {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 66px;
    left: 0;
    right: 0;
    background: var(--bub-card);
    border-bottom: var(--bub-border);
    padding: 14px 24px 18px;
    gap: 8px;
    box-shadow: 6px 6px 0 rgba(23, 24, 28, 0.18);
  }
  .bub-header.bub-open .bub-nav-link { border: var(--bub-border); background: #fff; box-shadow: var(--bub-shadow-sm); }
  .bub-header.bub-open .bub-header-cta {
    display: inline-flex;
    position: absolute;
    top: auto;
    bottom: -68px;
    right: 24px;
    z-index: 2;
  }
  .bub-hero { padding: 48px 0 60px; }
  .bub-hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .bub-hero-visual { justify-content: center; min-height: 0; padding-bottom: 22px; }
  .bub-chat { width: min(420px, 100%); }
  .bub-hero-dot { display: none; }
  .bub-screens, .bub-scenes, .bub-reviews { padding: 58px 0; }
  .bub-features, .bub-faq { padding: 54px 0 58px; }
  .bub-screens-row {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding-bottom: 14px;
    -webkit-overflow-scrolling: touch;
  }
  .bub-screen-card { flex: 0 0 236px; scroll-snap-align: center; }
  .bub-screen-card-mid, .bub-screen-card:nth-child(1), .bub-screen-card:nth-child(3) { transform: none; }
  .bub-swipe-hint { display: block; }
  .bub-featurelist { grid-template-columns: 1fr; }
  .bub-scene-list { grid-template-columns: 1fr; gap: 18px; }
  .bub-review-grid { grid-template-columns: 1fr; gap: 18px; }
  .bub-review:nth-child(3n+1), .bub-review:nth-child(3n+2), .bub-review:nth-child(3n) { transform: none; }
  .bub-download { padding: 58px 0; }
  .bub-download-inner { grid-template-columns: 1fr; gap: 36px; justify-items: start; }
  .bub-download-qr { display: none; }
  .bub-footer-copy { margin-left: 0; width: 100%; }
}

@media (max-width: 480px) {
  .bub-h1 { font-size: 34px; }
  .bub-hero-sub { font-size: 20px; }
  .bub-h2 { font-size: 24px; }
  .bub-hero-lead { font-size: 15px; }
  .bub-hero-actions .bub-btn-main {
    width: 100%;
    justify-content: center;
  }
  .bub-chat-body { padding: 14px 12px 10px; }
  .bub-msg { max-width: 90%; font-size: 14px; }
  .bub-wrap { padding: 0 18px; }
}

/* ---------- 404 页 ---------- */
.bub-404-box { text-align: center; padding: 60px 24px; }
.bub-404-code {
  display: inline-block;
  font-size: 88px;
  font-weight: 800;
  line-height: 1;
  background: var(--bub-red);
  color: #fff;
  border: var(--bub-border);
  border-radius: 16px;
  padding: 10px 28px;
  box-shadow: var(--bub-shadow);
  margin-bottom: 26px;
}
.bub-404-text { margin: 14px auto 28px; color: var(--bub-sub); font-weight: 600; max-width: 420px; }

/* 焦点可见性 */
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid var(--bub-blue);
  outline-offset: 2px;
  border-radius: 6px;
}