/* ============================================================
 * iPhone Duo 单页站 · 样式（Apple 风浅色主题）
 * 白底、大留白、细发丝线、蓝色只做点缀。配色在 :root。
 * 断点 <640 单列 / 640-1024 两列 / >1024 三至四列
 * ============================================================ */

:root {
  --c-bg: #ffffff;
  --c-bg-alt: #f5f5f7;
  --c-panel: #ffffff;
  --c-line: rgba(0, 0, 0, 0.09);
  --c-line-strong: rgba(0, 0, 0, 0.22);

  --c-text: #1d1d1f;
  --c-text-2: #6e6e73;
  --c-text-3: #86868b;

  --c-blue: #0071e3;
  --c-blue-h: #0077ed;
  --c-blue-soft: rgba(0, 113, 227, 0.08);
  --c-green: #009f5d;

  --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.1);

  --wrap: 1080px;
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);

  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
          "Helvetica Neue", "Microsoft YaHei", "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
  background: var(--c-bg);
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.65;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; line-height: 1.2; letter-spacing: -0.015em; font-weight: 600; }
p { margin: 0; }
img { max-width: 100%; display: block; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 22px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 99;
  padding: 10px 16px;
  background: var(--c-blue);
  color: #fff;
  border-radius: 0 0 var(--r-sm, 10px) 0;
}
.skip-link:focus { left: 0; }

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

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  font-family: inherit;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-blue);
  background: transparent;
  border: 1px solid var(--c-line);
  border-radius: 980px;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.btn:hover { background: var(--c-blue-soft); border-color: transparent; }

.btn--primary {
  color: #fff;
  background: var(--c-blue);
  border-color: transparent;
}
.btn--primary:hover { background: var(--c-blue-h); }

.btn--ghost { color: var(--c-text); background: transparent; }
.btn--ghost:hover { background: rgba(0, 0, 0, 0.05); }

.btn--sm { padding: 6px 14px; font-size: 13px; }
.btn--block { width: 100%; }

/* ---------------- 顶部导航 ---------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 1px solid var(--c-line);
}

.topbar__inner {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 62px;
}

.brand { display: flex; align-items: center; gap: 11px; min-width: 0; }

.brand__mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  background: var(--c-text);
  border-radius: 9px;
}

.brand__text { display: flex; flex-direction: column; min-width: 0; }
.brand__text strong { font-size: 15px; font-weight: 600; letter-spacing: -0.01em; }
.brand__text em {
  font-style: normal;
  font-size: 11.5px;
  color: var(--c-text-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav {
  display: flex;
  gap: 2px;
  margin-left: auto;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav::-webkit-scrollbar { display: none; }

.nav a {
  padding: 7px 12px;
  font-size: 13.5px;
  color: var(--c-text-2);
  border-radius: 980px;
  white-space: nowrap;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav a:hover { color: var(--c-text); background: rgba(0, 0, 0, 0.05); }

.topbar__actions { display: flex; align-items: center; gap: 10px; }

.lang {
  min-width: 46px;
  padding: 6px 12px;
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--c-text);
  background: transparent;
  border: 1px solid var(--c-line);
  border-radius: 980px;
  cursor: pointer;
  transition: background 0.2s var(--ease);
}
.lang:hover { background: rgba(0, 0, 0, 0.05); }

/* ---------------- 首屏（域名出售条） ---------------- */
.lead { padding: 36px 0 10px; }

.pill {
  display: inline-flex;
  align-items: center;
  padding: 5px 13px;
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 500;
  color: var(--c-text-2);
  background: var(--c-bg-alt);
  border: 1px solid var(--c-line);
  border-radius: 980px;
}

/* ---------------- 域名出售（唯一一块，紧凑横排） ---------------- */
.salestrip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
  padding: 14px 24px;
  background: var(--c-bg-alt);
  border-radius: 16px;
}

.salestrip__eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-text-3);
}

.salestrip__domains { display: flex; flex-wrap: wrap; gap: 4px 22px; margin-top: 2px; }
.salestrip__domains b {
  font-size: clamp(17px, 2.4vw, 21px);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.domain__tag {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 8px;
  vertical-align: 3px;
  font-size: 10.5px;
  font-weight: 600;
  color: var(--c-green);
  background: rgba(0, 159, 93, 0.09);
  border-radius: 980px;
}

.salestrip__note { margin-top: 3px; font-size: 13px; color: var(--c-text-2); max-width: 52ch; }

.salestrip__actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.salestrip .btn { padding: 8px 18px; font-size: 14px; }
.salestrip__email {
  font-size: 14px;
  font-weight: 500;
  color: var(--c-text-2);
}

/* ---------------- 通用区块 ---------------- */
.section { padding: 68px 0; }
.section--alt { background: var(--c-bg-alt); }

.section__head { margin-bottom: 32px; }
.section__title { font-size: clamp(28px, 4vw, 40px); font-weight: 700; letter-spacing: -0.02em; }
.section__sub { margin-top: 8px; max-width: 62ch; font-size: 16px; color: var(--c-text-2); }
.section__more { display: flex; justify-content: center; margin-top: 28px; }

/* ---------------- 广告位 ---------------- */
.adwrap { padding: 0 0 60px; }

.adslot {
  position: relative;
  margin: 0 auto;
  padding: 10px;
  background: var(--c-bg-alt);
  border: 1px dashed #d2d2d7;
  border-radius: 16px;
}
.adslot__label {
  position: absolute;
  top: 10px;
  right: 14px;
  padding: 1px 9px;
  font-size: 11px;
  font-weight: 500;
  color: var(--c-text-3);
  background: #e8e8ed;
  border-radius: 980px;
}
.adslot__body {
  display: grid;
  place-items: center;
  min-height: 100px;
  text-align: center;
}
.adslot__tip { font-size: 12.5px; color: var(--c-text-3); }
.adslot--banner { max-width: 100%; }
.adslot--square { max-width: 320px; margin-top: 32px; }
.adslot--square .adslot__body { min-height: 250px; }

/* ---------------- Duo 头条 ---------------- */
.news {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
}

.newscard {
  display: flex;
  flex-direction: column;
  padding: 24px;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: 18px;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.newscard:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.newscard__date { font-size: 12.5px; font-weight: 600; color: var(--c-text-3); letter-spacing: 0.03em; }
.newscard__title { margin-top: 10px; font-size: 17px; font-weight: 600; letter-spacing: -0.01em; }
.newscard__summary { margin-top: 8px; font-size: 14px; color: var(--c-text-2); }
.newscard__more { margin-top: auto; padding-top: 16px; font-size: 14px; font-weight: 500; color: var(--c-blue); }
.newscard__more[hidden] { display: none; }
.newscard__more:hover { text-decoration: underline; }

/* ---------------- 时间轴 ---------------- */
.timeline { position: relative; padding-left: 28px; }
.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--c-line);
}

.tlitem { position: relative; padding-bottom: 20px; }
.tlitem::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 10px;
  width: 9px;
  height: 9px;
  background: var(--c-blue);
  border-radius: 50%;
}
.tlitem--upcoming::before { background: #ffb020; }
.tlitem--later::before { background: #c7c7cc; }

.tlitem__head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.tlitem__date { font-size: 13.5px; font-weight: 600; color: var(--c-text-2); font-variant-numeric: tabular-nums; }

.tlitem__tag {
  padding: 2px 9px;
  font-size: 11px;
  font-weight: 600;
  color: var(--c-text-2);
  background: rgba(0, 0, 0, 0.05);
  border-radius: 980px;
}
.tlitem--upcoming .tlitem__tag { color: #9a6a00; background: rgba(255, 176, 32, 0.16); }
.tlitem--release .tlitem__tag { color: var(--c-green); background: rgba(0, 159, 93, 0.1); }

.tlitem__title { margin-top: 5px; font-size: 16.5px; font-weight: 600; }
.tlitem__desc { margin-top: 3px; font-size: 14px; color: var(--c-text-2); }

/* ---------------- 推荐导航（hao123 式） ---------------- */
.linkgroup { margin-bottom: 34px; }

.linkgroup__head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.linkgroup__head h3 { font-size: 17px; font-weight: 600; }
.linkgroup__icon {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  color: var(--c-blue);
  background: var(--c-blue-soft);
  border-radius: 9px;
}
.linkgroup__icon svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.9; }

.linkgrid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
  gap: 12px;
}

.linkcell {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 13px 14px;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: 14px;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.linkcell:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); }

.linkcell__icon {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  font-size: 13px;
  font-weight: 700;
  color: #fff;
  border-radius: 10px;
  background: var(--c-text);
}
.linkcell__icon svg { width: 17px; height: 17px; fill: none; stroke: currentColor; stroke-width: 1.9; }

.linkcell__body { min-width: 0; }
.linkcell__name {
  display: block;
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.linkcell__desc {
  display: block;
  font-size: 11.5px;
  color: var(--c-text-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------------- 视频 ---------------- */
.videogroup { margin-bottom: 34px; }
.videogroup__head { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
.videogroup__head h3 { font-size: 17px; font-weight: 600; }

.videogrid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 18px;
}

.videocard {
  display: block;
  background: var(--c-panel);
  border: 1px solid var(--c-line);
  border-radius: 18px;
  overflow: hidden;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.videocard:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }

.videocard__cover {
  position: relative;
  aspect-ratio: 16 / 9;
  background: linear-gradient(140deg, #e8ebf1 0%, #f5f5f7 100%);
}
.videocard__play {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  transform: translate(-50%, -50%);
  color: #fff;
  background: rgba(29, 29, 31, 0.6);
  border-radius: 50%;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.videocard__play svg { width: 18px; height: 18px; fill: currentColor; margin-left: 2px; }

.videocard__platform {
  position: absolute;
  right: 10px;
  bottom: 10px;
  z-index: 1;
  padding: 3px 9px;
  font-size: 11px;
  font-weight: 600;
  color: var(--c-text);
  background: rgba(255, 255, 255, 0.85);
  border-radius: 980px;
}

.videocard__body { padding: 14px 16px 17px; }
.videocard__title { font-size: 15px; font-weight: 600; line-height: 1.45; letter-spacing: -0.01em; }
.videocard__author { margin-top: 6px; font-size: 12.5px; color: var(--c-text-3); }

/* ---------------- 页脚 ---------------- */
.footer {
  padding: 40px 0 110px;
  background: var(--c-bg-alt);
  border-top: 1px solid var(--c-line);
}

.footer__legal {
  text-align: center;
  max-width: 760px;
}
.disclaimer { font-size: 12px; line-height: 1.8; color: var(--c-text-3); white-space: pre-wrap; }
.copyright { margin-top: 10px; font-size: 12px; color: var(--c-text-3); }

/* ---------------- 移动端底部悬浮条 ---------------- */
.dockbar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 50;
  display: none;
  padding: 12px 16px calc(12px + env(safe-area-inset-bottom, 0px));
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-top: 1px solid var(--c-line);
}

.noscript {
  padding: 20px;
  margin-top: 20px;
  font-size: 13.5px;
  color: var(--c-text-2);
  background: var(--c-bg-alt);
  border-radius: 14px;
}
.noscript p + p { margin-top: 8px; }

/* ---------------- 进场动画 ---------------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}
.reveal.is-in { opacity: 1; transform: none; margin-bottom: 20;}

.fade-swap { transition: opacity 0.12s linear; }
.fade-swap.is-out { opacity: 0.35; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1024px) {
  .nav { display: none; }
  .topbar__inner { height: 58px; }
}

@media (max-width: 640px) {
  body { font-size: 15px; }
  .wrap { padding: 0 18px; }
  .brand__text em { display: none; }
  #navSaleBtn { display: none; }

  .lead { padding: 22px 0 0; }
  .salestrip { flex-direction: column; align-items: stretch; padding: 14px 18px; }
  .salestrip__actions .btn { flex: 1 1 auto; }
  .salestrip__email { text-align: center; }

  .section { padding: 52px 0; }
  .news, .videogrid { grid-template-columns: 1fr; }
  .linkgrid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .adslot--square { max-width: 100%; }
  .dockbar { display: block; }
  .footer { padding-bottom: 130px; }
}

@media (max-width: 380px) {
  .linkgrid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}