/* team-v4 — 单页白底，无外卡片，无分割线
   ─────────────────────────────────
   设计原则：
   - 整页通底白，无外圈卡片、无阴影
   - section 之间靠大间距 + mono eyebrow 标题分割，**不用** 分割线
   - 中部内容仅在必要时用浅底色块（press / founders）做分组
   - sticky 子导航也只用淡毛玻璃，无上下边线
   - 圆角统一为 60% 平滑（iOS / Figma 风 squircle）：
     使用 corner-shape: squircle + 60% 平滑系数；
     不支持的浏览器自动回退为标准 border-radius。
*/

/* ─── 60% 平滑圆角（squircle）通用类 ───
   规则：圆角矩形（不含 50% 圆 / 完全胶囊形）统一加 .t4-sq60，
   通过 corner-shape: squircle 60% 实现 60% 平滑过渡。 */
.t4 .t4-sq60{
  /* CSS Corner Shaping (Chrome 139+/实验) */
  corner-shape: squircle;
  /* 备用语法（不同实现阶段的别名，浏览器忽略未识别的属性） */
  -webkit-corner-shape: squircle;
}

:root{
  --t4-ink:#1d1d1f;
  --t4-ink-2:#3c3c43;
  --t4-ink-3:#86868b;
  --t4-ink-4:#a1a1a6;
  --t4-line:#ececef;          /* 仅极少数地方使用 */
  --t4-line-2:#f2f2f5;
  --t4-bg:#ffffff;
  --t4-page:#ffffff;
  --t4-soft:#f5f5f7;
  --t4-mark:#1d1d1f;
  --t4-accent:#1d1d1f;
  --t4-edit:#fef9c3;
  --t4-edit-line:#facc15;
  /* 统一使用苹果系统字体（San Francisco / 苹方） */
  --t4-mono: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", system-ui, sans-serif;
  --t4-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", system-ui, sans-serif;
  --t4-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", system-ui, sans-serif;
}

.t4{
  font-family: var(--t4-sans);
  color: var(--t4-ink);
  background: var(--t4-page);
  height: 100%;
  -webkit-font-smoothing: antialiased;
  letter-spacing: -0.005em;
}
.t4 *{ box-sizing: border-box; }
.t4 a{ color: inherit; text-decoration: none; }

.t4-scroll{
  height: 100%;
  overflow-y: auto;
  background: var(--t4-page);
}
.t4-page{
  padding: 0;
  display: flex;
  justify-content: center;
}
.t4-doc{
  width: 100%;
  max-width: 800px;
  background: transparent;
  border-radius: 0;
  box-shadow: none;
  padding: 0 32px 120px;
}

/* ─────── 顶部卡片：包住 Hero + Brief ───────
   参考 Airbnb listing card：~16px squircle 圆角 + 柔和分层阴影 + hover 抬升
   - 用负 margin 抵消 .t4-doc 的水平内边距，向外扩 32px 形成卡片边界
   - 不改变 hero / brief 内部的任何尺寸 */
.t4-topcard{
  background: #ffffff;
  border-radius: 28px;
  border: 1px solid rgba(0, 0, 0, 0.04);
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.04),
    0 14px 44px -10px rgba(0, 0, 0, 0.10);
  margin: 96px -32px 20px;
  padding: 36px 32px;
  transition:
    box-shadow .2s cubic-bezier(.2,0,0,1),
    transform .15s cubic-bezier(.2,0,0,1);
  /* squircle 圆角（支持的浏览器自动启用） */
  corner-shape: squircle;
  -webkit-corner-shape: squircle;
}
.t4-topcard:hover{
  box-shadow:
    0 2px 4px rgba(0, 0, 0, 0.05),
    0 22px 56px -10px rgba(0, 0, 0, 0.14);
  transform: translateY(-1px);
}

/* ─────── HERO ─────── */
.t4-hero{
  padding: 0;
  background: transparent;
}
.t4-hero-top{
  display: flex;
  align-items: flex-start;
  gap: 24px;
}
.t4-hero-avatar{
  width: 80px; height: 80px;
  flex-shrink: 0;
  border-radius: 50%;
  /* 默认白底：很多团队 logo 是深色 SVG，黑底会让图标整个糊掉
     fallback 的手掌 SVG 自带描边颜色（color: --t4-mark），白底下也可见 */
  background: #fff;
  color: var(--t4-mark);
  /* 轻微描边把白圆形和白卡片背景区分开 */
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.06);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.t4-hero-headline{
  flex: 1;
  min-width: 0;
  padding-top: 4px;
}
.t4-hero-name{
  font-family: var(--t4-display);
  font-size: 26px;
  font-weight: 500;
  letter-spacing: -0.022em;
  line-height: 1.1;
  margin: 0;
  color: var(--t4-ink);
}
.t4-hero-tag{
  margin: 6px 0 0;
  font-size: 15.5px;
  line-height: 1.45;
  color: var(--t4-ink-2);
  font-weight: 400;
}

/* domain + verified 行 */
.t4-hero-id-row{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
  align-items: center;
}
.t4-id-pill{
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 28px;
  padding: 0 11px;
  border-radius: 999px;
  background: #f3f4f6;
  color: #4b5563;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.005em;
  line-height: 1;
  cursor: pointer;
  transition: background .15s, color .15s;
}
.t4-id-pill:hover{ background: #e5e7eb; color: #1f2937; }
.t4-id-arr{
  color: #9ca3af;
  transition: transform .15s, color .15s;
}
.t4-id-pill:hover .t4-id-arr{
  color: #1f2937;
  transform: translate(1px, -1px);
}
.t4-verified-pill{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  height: 28px;
  padding: 0 11px 0 9px;
  border-radius: 999px;
  background: #2e84fa;
  color: #fff;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: -0.005em;
  line-height: 1;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}
.t4-verified-pill__label{
  display: inline-block;
  line-height: 1;
}
.t4-verified-pill > span{
  display: inline-flex;
  align-items: center;
  line-height: 1;
}
.t4-verified-pill svg{
  display: block;
  background: #fff;
  color: #2e84fa;
  border-radius: 50%;
  padding: 1.5px;
  width: 13px;
  height: 13px;
  flex-shrink: 0;
}

/* meta + values 胶囊行(描边白底) */
.t4-hero-chiprow{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}
.t4-chip{
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  font-size: 13px;
  color: #1f2937;
  font-weight: 400;
  letter-spacing: -0.005em;
  line-height: 1;
  white-space: nowrap;
}
.t4-chip svg{
  color: #6b7280;
  flex-shrink: 0;
}

/* 特殊 chip: 被基金投资 — 可点击，沿用普通 chip 的白底 + 细描边 */
.t4-chip--funded{
  appearance: none;
  cursor: pointer;
  font-family: inherit;
  font-weight: 500;
  padding-right: 8px;
  transition: transform .15s cubic-bezier(.2,0,0,1), box-shadow .2s, border-color .2s;
}
.t4-chip--funded .t4-chip-arr{
  display: inline-flex;
  margin-left: 2px;
  width: 16px; height: 16px;
  align-items: center; justify-content: center;
  border-radius: 999px;
  background: rgba(0,0,0,0.06);
  font-size: 12px;
  line-height: 1;
  color: #1f2937;
}
.t4-chip--funded:hover{
  transform: translateY(-1px);
  border-color: rgba(0,0,0,0.18);
  box-shadow: 0 4px 14px -4px rgba(0,0,0,0.12);
}
.t4-chip--funded:hover .t4-chip-arr{ background: rgba(0,0,0,0.1); }
.t4-chip--funded:active{ transform: translateY(0); }

/* ─── 融资历史弹窗 ─── */
.t4-fmodal-backdrop{
  position: fixed; inset: 0;
  background: rgba(15, 23, 42, 0.38);
  -webkit-backdrop-filter: blur(8px) saturate(140%);
  backdrop-filter: blur(8px) saturate(140%);
  z-index: 9000;
  display: flex; align-items: center; justify-content: center;
  padding: 32px 16px;
  animation: t4fIn .18s ease-out both;
}
@keyframes t4fIn{ from{opacity:0} to{opacity:1} }
.t4-fmodal{
  width: 100%;
  max-width: 560px;
  max-height: calc(100vh - 64px);
  background: #ffffff;
  border-radius: 24px;
  border: 1px solid rgba(0,0,0,0.04);
  box-shadow: 0 1px 2px rgba(0,0,0,0.04), 0 30px 80px -20px rgba(0,0,0,0.35);
  display: flex; flex-direction: column;
  overflow: hidden;
  animation: t4fUp .22s cubic-bezier(.2,0,0,1) both;
  -webkit-corner-shape: squircle; corner-shape: squircle;
}
@keyframes t4fUp{ from{opacity:0;transform:translateY(12px) scale(.98)} to{opacity:1;transform:none} }
.t4-fmodal-head{
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 12px;
  padding: 24px 28px 16px;
  border-bottom: 1px solid rgba(0,0,0,0.06);
}
.t4-fmodal-eyebrow{
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 11px; letter-spacing: 0.14em;
  color: #8a8a8f;
  text-transform: uppercase;
}
.t4-fmodal-title{
  font-size: 22px; font-weight: 600; letter-spacing: -0.01em;
  margin: 4px 0 2px; color: #1d1d1f;
}
.t4-fmodal-sub{ margin: 0; font-size: 13px; color: #6b7280; }
.t4-fmodal-x{
  appearance: none; border: 0; cursor: pointer;
  width: 32px; height: 32px; border-radius: 999px;
  background: rgba(0,0,0,0.05); color: #1d1d1f;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background .15s, transform .15s;
  flex-shrink: 0;
}
.t4-fmodal-x:hover{ background: rgba(0,0,0,0.1); transform: scale(1.05); }

.t4-frounds{
  list-style: none; margin: 0;
  padding: 8px 28px 20px;
  overflow-y: auto;
}
.t4-fround{
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px dashed rgba(0,0,0,0.08);
}
.t4-fround:last-child{ border-bottom: 0; }
.t4-fround-rail{ position: relative; }
.t4-fround-rail::before{
  content: ''; position: absolute; left: 50%; top: 0; bottom: -18px;
  width: 1px; background: rgba(0,0,0,0.1);
}
.t4-fround:last-child .t4-fround-rail::before{ bottom: 50%; }
.t4-fround-rail .dot{
  position: absolute; left: 50%; top: 8px;
  width: 9px; height: 9px; border-radius: 50%;
  background: #0f172a;
  transform: translateX(-50%);
  box-shadow: 0 0 0 4px #ffffff, 0 0 0 5px rgba(15,23,42,0.12);
}
.t4-fround-head{
  display: flex; align-items: baseline; gap: 10px;
  margin-bottom: 6px;
}
.t4-fround-round{
  font-size: 15px; font-weight: 600; color: #1d1d1f;
  letter-spacing: -0.005em;
}
.t4-fround-date{
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 11.5px; color: #8a8a8f;
}
.t4-fround-amt{
  display: flex; align-items: baseline; gap: 8px;
  margin-bottom: 10px;
}
.t4-fround-amt .amt{
  font-size: 22px; font-weight: 600;
  font-feature-settings: "tnum";
  color: #0f172a;
  letter-spacing: -0.01em;
}
.t4-fround-amt .val{ font-size: 12.5px; color: #6b7280; }
.t4-fround-line{
  display: flex; gap: 10px; align-items: flex-start;
  margin-top: 4px;
}
.t4-fround-key{
  font-size: 11.5px; color: #8a8a8f;
  flex-shrink: 0; padding-top: 4px;
  width: 28px;
}
.t4-fround-chips{ display: flex; flex-wrap: wrap; gap: 6px; }
.t4-fchip{
  display: inline-flex; align-items: center;
  height: 24px; padding: 0 10px;
  border-radius: 999px;
  background: #f4f4f5;
  border: 1px solid rgba(0,0,0,0.04);
  font-size: 12px; color: #1f2937;
  line-height: 1;
}
.t4-fchip.lead{
  background: #fef3c7;
  border-color: #fde68a;
  color: #78350f;
  font-weight: 500;
}
.t4-fmodal-foot{
  padding: 12px 28px 18px;
  font-size: 11px; color: #9ca3af;
  border-top: 1px solid rgba(0,0,0,0.04);
  background: #ffffff;
}
@media (max-width: 520px){
  .t4-fmodal{ border-radius: 18px; }
  .t4-fmodal-head, .t4-frounds, .t4-fmodal-foot{ padding-left: 18px; padding-right: 18px; }
}

/* ─────── Hero 下双列：创始团队 + 最近新闻 ─────── */
.t4-brief{
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  /* 让两列高度对齐 */
  grid-auto-rows: 1fr;
  gap: 20px;  padding: 0;
  margin: 0 -32px 0;
}
.t4-brief-card{
  background: #ffffff;
  border-radius: 24px;
  border: 1px solid rgba(0, 0, 0, 0.04);
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.04),
    0 14px 44px -10px rgba(0, 0, 0, 0.10);
  padding: 26px 26px;
  /* 高度由「创始团队」内容决定，最近新闻通过 grid 1fr 同步对齐 */
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-width: 0;
  transition:
    box-shadow .2s cubic-bezier(.2,0,0,1),
    transform .15s cubic-bezier(.2,0,0,1);
  corner-shape: squircle;
  -webkit-corner-shape: squircle;
}
.t4-brief-card:hover{
  box-shadow:
    0 2px 4px rgba(0, 0, 0, 0.05),
    0 22px 56px -10px rgba(0, 0, 0, 0.14);
  transform: translateY(-1px);
}
.t4-brief-eyebrow{
  font-family: var(--t4-sans);
  font-size: 15px;
  color: var(--t4-ink);
  font-weight: 400;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
}

/* 创始团队 列表 */
.t4-brief-team{
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}
.t4-brief-person{
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.t4-brief-av{
  width: 34px; height: 34px;
  border-radius: 50%;
  background-size: cover;
  background-position: center;
  flex-shrink: 0;
}
.t4-brief-pmeta{ min-width: 0; flex: 1; }
.t4-brief-pmeta .nm{
  font-size: 13.5px;
  font-weight: 400;
  color: var(--t4-ink);
  letter-spacing: -0.005em;
  line-height: 1.25;
}
.t4-brief-pmeta .rl{
  font-size: 12px;
  color: var(--t4-ink-3);
  font-family: var(--t4-sans);
  margin-top: 2px;
}
.t4-brief-soc{
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}
.t4-brief-soc a{
  width: 22px; height: 22px;
  border-radius: 8px;
  corner-shape: squircle;
  -webkit-corner-shape: squircle;
  transform: rotate(-1.5deg);
  transition: transform .18s cubic-bezier(.34,1.6,.64,1), box-shadow .18s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  text-decoration: none;
  background: transparent;
  overflow: hidden;
}
.t4-brief-soc a img{
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 8px;
  corner-shape: squircle;
  -webkit-corner-shape: squircle;
}
.t4-brief-soc a:hover{
  transform: rotate(0deg) translateY(-2px);
  box-shadow: 0 6px 14px -4px rgba(0,0,0,0.22);
  z-index: 1;
}
.t4-brief-soc a:active{
  transform: rotate(0deg) translateY(0);
  transition-duration: .08s;
}
.t4-brief-person:hover .t4-brief-soc a{
  transform: rotate(0deg);
}
.t4-brief-person:hover .t4-brief-soc a:hover{
  transform: rotate(0deg) translateY(-2px);
}

/* 最近新闻 列表 */
.t4-brief-news{
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}
.t4-brief-news-row{
  min-width: 0;
}
.t4-brief-news-link{
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  column-gap: 12px;
  row-gap: 2px;
  font-size: 13px;
  color: var(--t4-ink-2);
  min-width: 0;
  line-height: 1.5;
  text-decoration: none;
  cursor: pointer;
  transition: opacity .15s ease;
}
.t4-brief-news-link:hover{ opacity: .65; }
.t4-brief-news-link:hover .arr{ transform: translate(2px, -2px); }
.t4-brief-news-link .arr{
  color: var(--t4-ink-3);
  font-size: 12px;
  transition: transform .15s ease;
  align-self: center;
}
.t4-brief-news-row .src{
  font-weight: 400;
  color: var(--t4-ink);
  flex-shrink: 0;
  font-size: 13px;
  white-space: nowrap;
}
.t4-brief-news-row .t{
  color: var(--t4-ink-3);
  font-size: 13px;
  min-width: 0;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* signals 模块（页中的「最近新闻」）字号放大到 15，
   不影响顶部 brief 区域的 .t4-brief-news */
.t4-signals-news .t4-brief-news-link{ font-size: 15px; }
.t4-signals-news .t4-brief-news-row .src{ font-size: 15px; }
.t4-signals-news .t4-brief-news-row .t{ font-size: 15px; }
.t4-signals-news .t4-brief-news-link .arr{ font-size: 14px; }

/* sentinel：放在 nav 上方 1px，吸顶后会被滚出视窗触发 is-stuck */
.t4-nav-sentinel{
  height: 1px;
  width: 100%;
  margin-top: 64px;
  margin-bottom: -1px;
  pointer-events: none;
}
.t4-nav-sentinel + .t4-nav{ margin-top: 0; }

/* ─────── 吸顶导航 ─────── */
.t4-nav{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,0.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border: 0;
  margin: 36px 0 0;
  padding: 0;
  /* 吸顶时显示分隔线 —— top:-1px 让吸顶时元素会出现 1px overflow，触发 stuck 状态 */
}
.t4-nav::after{
  content: '';
  position: absolute;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  width: 100vw;
  max-width: 100vw;
  height: 1px;
  background: var(--t4-line);
  opacity: 0;
  transition: opacity .18s ease;
  pointer-events: none;
}
.t4-nav.is-stuck::after{ opacity: 1; }
.t4-nav-inner{
  display: flex;
  gap: 2px;
  padding: 12px 0;
}
.t4-nav-item{
  appearance: none;
  border: 0;
  background: transparent;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 400;
  color: var(--t4-ink-3);
  cursor: pointer;
  font-family: var(--t4-sans);
  letter-spacing: -0.005em;
  transition: background .15s, color .15s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.t4-nav-item .label{
  line-height: 1;
  /* CJK 字形顶部留空，向上微调让和拉丁标签视觉对齐 */
  transform: translateY(-0.5px);
}
.t4-nav-item .count{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 17px;
  padding: 0 5px;
  border-radius: 999px;
  font-family: var(--t4-sans);
  font-size: 10.5px;
  font-weight: 500;
  background: var(--t4-soft);
  color: var(--t4-ink-3);
  line-height: 1;
  /* 平衡 CJK label 的下移 */
  transform: translateY(-0.5px);
}
.t4-nav-item:hover{ color: var(--t4-ink); background: var(--t4-soft); }
.t4-nav-item:hover .count{ background: #fff; }
.t4-nav-item.on{
  background: var(--t4-ink);
  color: #fff;
}
.t4-nav-item.on .count{
  background: rgba(255,255,255,0.18);
  color: #fff;
}
.t4-nav-item.accent .count{
  background: var(--t4-soft);
  color: var(--t4-ink-2);
}
.t4-nav-item.accent:hover .count{ background: #fff; color: var(--t4-ink-2); }
.t4-nav-item.on.accent .count{
  background: rgba(255,255,255,0.18);
  color: #fff;
}

/* ─────── Section（无分割线，靠间距） ─────── */
.t4-sec{
  padding: 72px 0 0;
  border: 0;
}
.t4-sec:first-of-type{ padding-top: 56px; }
/* about 段落紧跟 nav 吸顶条，缩短上边距 */
#t4s-about{ padding-top: 28px; }
.t4-sec-head{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 24px;
}
.t4-sec-label{
  font-family: var(--t4-sans);
  font-size: 15px;
  color: var(--t4-ink);
  font-weight: 400;
  letter-spacing: -0.01em;
}
.t4-sec-count{
  font-family: var(--t4-sans);
  font-size: 12px;
  color: var(--t4-ink-4);
}

/* signals (#t4s-signals) 和 founders (#t4s-team) 第一行没有内 padding，
   视觉上比 jobs (有 hover padding) 紧凑——补一点呼吸空间 */
#t4s-signals .t4-sec-head,
#t4s-team .t4-sec-head{
  margin-bottom: 36px;
}

/* ─────── About / Markdown ─────── */
.t4-about{
  position: relative;
}
.t4-about-tools{
  position: absolute;
  top: -42px;
  right: 0;
  display: flex;
  gap: 6px;
}
.t4-about-tools button{
  background: transparent;
  border: 0;
  border-radius: 999px;
  padding: 4px 10px;
  font-family: var(--t4-sans);
  font-size: 12px;
  color: var(--t4-ink-3);
  cursor: pointer;
}
.t4-about-tools button:hover{ background: var(--t4-soft); color: var(--t4-ink); }
.t4-about-tools button.on{ background: var(--t4-ink); color: #fff; }

.t4-md{
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--t4-ink-2);
}
.t4-md h2{
  font-family: var(--t4-display);
  font-size: 19px;
  line-height: 1.3;
  font-weight: 500;
  letter-spacing: -0.012em;
  color: var(--t4-ink);
  margin: 36px 0 12px;
}
.t4-md h2:first-child{ margin-top: 0; }
.t4-md p{ margin: 0 0 14px; text-wrap: pretty; }
.t4-md strong{ color: var(--t4-ink); font-weight: 600; }
.t4-md a{
  color: var(--t4-ink);
  text-decoration: underline;
  text-decoration-color: var(--t4-ink-4);
  text-underline-offset: 3px;
}
.t4-md ul{ margin: 6px 0 18px; padding-left: 20px; list-style: disc; }
.t4-md ul li{ margin-bottom: 6px; color: var(--t4-ink-2); }
.t4-md blockquote{
  margin: 22px 0;
  padding: 0 0 0 18px;
  border-left: 2px solid var(--t4-ink);
  font-size: 16px;
  line-height: 1.55;
  color: var(--t4-ink);
  font-style: normal;
  font-weight: 400;
}

.t4-about-edit{
  width: 100%;
  min-height: 600px;
  border: 1px dashed var(--t4-edit-line);
  background: #fffdf3;
  border-radius: 8px;
  corner-shape: squircle;
  -webkit-corner-shape: squircle;
  padding: 18px 20px;
  font-family: var(--t4-sans);
  font-size: 14px;
  line-height: 1.75;
  color: var(--t4-ink);
  outline: none;
  resize: vertical;
}
.t4-about-hint{
  margin-top: 10px;
  font-family: var(--t4-sans);
  font-size: 12px;
  color: var(--t4-ink-4);
}

/* ─────── Signals (列表，无分割线) ─────── */
.t4-signals{
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.t4-signal-row{
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 12px 12px 0;
  border: 0;
  border-radius: 8px;
  corner-shape: squircle;
  -webkit-corner-shape: squircle;
  cursor: pointer;
  font-size: 14px;
  color: var(--t4-ink-2);
  transition: background .15s, padding .15s;
  margin: 0 -12px;
  padding-left: 12px;
}
.t4-signal-row:hover{ background: var(--t4-soft); }
.t4-signal-row:hover .t4-signal-arr{ color: var(--t4-ink); }
.t4-signal-kind{
  font-family: var(--t4-sans);
  font-size: 11px;
  color: var(--t4-ink-3);
  width: 44px;
  flex-shrink: 0;
}
.t4-signal-kind.podcast{ color: #1d1d1f; }
.t4-signal-src{
  font-weight: 400;
  color: var(--t4-ink);
  flex-shrink: 0;
  font-size: 13.5px;
}
.t4-signal-t{
  flex: 1;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--t4-ink-2);
  font-size: 13.5px;
}
.t4-signal-arr{
  color: var(--t4-ink-4);
  font-size: 13px;
  transition: color .15s;
}

/* ─────── Press grid ─────── */
.t4-press-grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.t4-press-card{
  display: flex;
  flex-direction: column;
  padding: 22px;
  border-radius: 14px;
  corner-shape: squircle;
  -webkit-corner-shape: squircle;
  background: var(--t4-soft);
  cursor: pointer;
  transition: background .15s;
  min-height: 132px;
}
.t4-press-card:hover{ background: #ececef; }
.t4-press-src{
  font-family: var(--t4-sans);
  font-size: 12px;
  color: var(--t4-ink-3);
  font-weight: 400;
}
.t4-press-quote{
  margin: 12px 0 16px;
  font-size: 15px;
  line-height: 1.5;
  font-weight: 400;
  color: var(--t4-ink);
  letter-spacing: -0.005em;
  text-wrap: pretty;
  flex: 1;
}
.t4-press-meta{
  display: flex;
  justify-content: space-between;
  font-family: var(--t4-sans);
  font-size: 12px;
  color: var(--t4-ink-4);
}
.t4-press-meta .arr{ color: var(--t4-ink-2); }

/* ─────── Jobs（无外框，无分割线，hover 高亮） ─────── */
.t4-jobs{
  display: flex;
  flex-direction: column;
  gap: 2px;
  border: 0;
  border-radius: 0;
  overflow: visible;
}
.t4-job-row{
  display: grid;
  grid-template-columns: 1fr auto 18px;
  align-items: center;
  gap: 16px;
  padding: 16px 14px;
  margin: 0 -14px;
  border: 0;
  border-radius: 10px;
  corner-shape: squircle;
  -webkit-corner-shape: squircle;
  cursor: pointer;
  background: transparent;
  transition: background .15s;
}
.t4-job-row:hover{ background: var(--t4-soft); }
.t4-job-main{ min-width: 0; }
.t4-job-role{
  font-size: 15px;
  font-weight: 400;
  color: var(--t4-ink);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.t4-job-role em{
  font-style: normal;
  color: var(--t4-ink-3);
  font-size: 15px;
  font-weight: 400;
}
.t4-job-role .hot{
  font-size: 10.5px;
  padding: 2px 6px;
  border-radius: 3px;
  corner-shape: squircle;
  -webkit-corner-shape: squircle;
  background: #fee2e2;
  color: #b91c1c;
  font-family: var(--t4-sans);
  font-weight: 600;
  font-style: normal;
}
.t4-job-loc{
  font-size: 15px;
  color: var(--t4-ink-3);
  margin-top: 4px;
  font-family: var(--t4-sans);
}
.t4-job-salary{
  font-size: 15px;
  color: var(--t4-ink-2);
  font-family: var(--t4-sans);
}
.t4-job-arr{
  color: var(--t4-ink-4);
  font-size: 14px;
}

/* ─────── Founders ─────── */
.t4-founders{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.t4-founder{
  padding: 22px;
  border-radius: 24px;
  corner-shape: squircle;
  -webkit-corner-shape: squircle;
  background: #ffffff;
  border: 0;
  box-shadow: 0 6px 16px 0 var(--ft-shadow, rgba(0,0,0,0.07));
  transition: box-shadow .25s ease, transform .25s ease;
}
.t4-founder:hover{
  background: #ffffff;
  box-shadow: 0 10px 24px 0 var(--ft-shadow-hover, rgba(0,0,0,0.11));
  transform: translateY(-2px);
}
.t4-founder-head{
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}
.t4-founder-av{
  width: 40px; height: 40px;
  border-radius: 50%;
  background-size: cover;
  background-position: center;
  flex-shrink: 0;
}
.t4-founder-id{ flex: 1; min-width: 0; }
.t4-founder-id .nm{
  font-size: 15px;
  font-weight: 400;
  letter-spacing: -0.01em;
  color: var(--t4-ink);
}
.t4-founder-id .rl{
  font-size: 15px;
  color: var(--t4-ink-3);
  font-family: var(--t4-sans);
  letter-spacing: -0.01em;
  margin-top: 1px;
}
.t4-founder-soc{
  display: flex;
  gap: 5px;
}
.t4-founder-soc a{
  width: 22px; height: 22px;
  border-radius: 8px;
  corner-shape: squircle;
  -webkit-corner-shape: squircle;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 0;
  color: var(--t4-ink-2);
  cursor: pointer;
  transform: rotate(-1.5deg);
  transition: transform .18s cubic-bezier(.34,1.6,.64,1), box-shadow .18s ease;
  text-decoration: none;
  overflow: hidden;
}
.t4-founder-soc a img{
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 8px;
  corner-shape: squircle;
  -webkit-corner-shape: squircle;
}
.t4-founder-soc a:hover{
  transform: rotate(0deg) translateY(-2px);
  box-shadow: 0 6px 14px -4px rgba(0,0,0,0.22);
  z-index: 1;
}
.t4-founder-soc a:active{
  transform: rotate(0deg) translateY(0);
  transition-duration: .08s;
}
.t4-founder:hover .t4-founder-soc a{
  transform: rotate(0deg);
}
.t4-founder:hover .t4-founder-soc a:hover{
  transform: rotate(0deg) translateY(-2px);
}
.t4-founder-quote{
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--t4-ink-2);
  letter-spacing: -0.005em;
}

/* ─────── Footer（无分割线） ─────── */
.t4-foot{
  display: flex;
  justify-content: space-between;
  margin-top: 96px;
  padding: 0;
  border: 0;
  font-family: var(--t4-sans);
  font-size: 12px;
  color: var(--t4-ink-4);
}

/* ─────── Tech Stack ───────
   每行：左 220px 类别 + 右侧弹性 items 网格
   item 自身没有边框、没有底色，只有 name + note，靠间距与左侧细线区隔行 */
.t4-stack{
  display: flex;
  flex-direction: column;
}
.t4-stack-row{
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  padding: 22px 0;
  border-top: 1px solid var(--t4-line);
}
.t4-stack-row:first-child{ border-top: 0; padding-top: 4px; }
.t4-stack-row:last-child{ padding-bottom: 4px; }

.t4-stack-cat{
  font-family: var(--t4-sans);
  font-size: 13px;
  color: var(--t4-ink-3);
  font-weight: 400;
  letter-spacing: -0.005em;
  padding-top: 2px;
}

.t4-stack-items{
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  column-gap: 28px;
  row-gap: 18px;
}

.t4-stack-item{
  min-width: 0;
}
.t4-stack-name{
  font-family: var(--t4-sans);
  font-size: 14.5px;
  font-weight: 500;
  color: var(--t4-ink);
  letter-spacing: -0.005em;
  line-height: 1.3;
}
.t4-stack-note{
  margin-top: 3px;
  font-family: var(--t4-sans);
  font-size: 13px;
  color: var(--t4-ink-3);
  line-height: 1.45;
  text-wrap: pretty;
}

/* ─────── 响应式微调 ─────── */
@media (max-width: 960px){
  .t4-stack-items{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 720px){
  .t4-doc{ padding: 0 20px 80px; }
  .t4-topcard{ margin: 20px -20px 20px; padding: 0 20px 28px; border-radius: 22px; }
  .t4-hero{ padding: 56px 0 16px; }
  .t4-hero-top{ flex-wrap: wrap; }
  .t4-sec{ padding-top: 56px; }
  .t4-foot{ margin-top: 64px; flex-direction: column; gap: 6px; }
  .t4-press-grid, .t4-founders{ grid-template-columns: 1fr; }
  .t4-brief{ grid-template-columns: 1fr; gap: 28px; }
  .t4-nav{ overflow-x: auto; margin-top: 48px; }
  .t4-nav-inner{ flex-wrap: nowrap; }
  .t4-about-tools{ position: static; margin-bottom: 12px; }
  .t4-stack-row{ grid-template-columns: 1fr; gap: 12px; }
  .t4-stack-items{ grid-template-columns: 1fr; }
}

/* ─── 详情页返回按钮 ─── */
.t4-back-btn{
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 50;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.85);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border: 1px solid #ececef;
  font-size: 13px;
  color: #1d1d1f;
  text-decoration: none;
  transition: transform 0.2s ease;
}
.t4-back-btn:hover{ transform: scale(0.96); }

/* ─────── 可插拔模块：单列 brief & Coming Soon 占位 ─────── */
.t4-brief--single{
  grid-template-columns: minmax(0, 1fr);
}
.t4-coming{
  margin: 24px -32px 0;
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.04);
  border-radius: 28px;
  padding: 32px;
  box-shadow:
    0 1px 2px rgba(0, 0, 0, 0.04),
    0 14px 44px -10px rgba(0, 0, 0, 0.10);
  transition:
    box-shadow .2s cubic-bezier(.2,0,0,1),
    transform .15s cubic-bezier(.2,0,0,1);
  corner-shape: squircle;
  -webkit-corner-shape: squircle;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  border-radius: 28px;
  border-start-start-radius: 28px;
  border-start-end-radius: 28px;
  border-end-start-radius: 28px;
  border-end-end-radius: 28px;
  -webkit-corner-shape: squircle;
  corner-shape: squircle;
}
.t4-coming-inner{
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--t4-ink-2, #6b6b70);
}
.t4-coming:hover{
  box-shadow:
    0 2px 4px rgba(0, 0, 0, 0.05),
    0 22px 56px -10px rgba(0, 0, 0, 0.14);
  transform: translateY(-1px);
}
.t4-coming-emoji{
  font-size: 36px;
  line-height: 1;
}
.t4-coming-title{
  font-family: var(--t4-display, -apple-system, "PingFang SC", sans-serif);
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--t4-ink, #1d1d1f);
}
.t4-coming-sub{
  font-size: 14px;
  color: var(--t4-ink-3, #8a8a8f);
}
@media (max-width: 720px){
  .t4-coming{ margin: 20px -20px 0; border-radius: 22px; padding: 28px 20px; }
  .t4-coming-title{ font-size: 24px; }
}