/* ==========================================================================
   AI落地者 · 独立样式（/ai/ 子站）
   由长沙湘创智鹅科技有限公司运营
   设计体系参考主站 xczhe.com（Stripe 紫），但独立维护，互不影响
   ========================================================================== */

:root{
  /* 品牌色 —— 与主站一致的 Stripe 紫，保证视觉血缘 */
  --brand:#533AFD;
  --brand-2:#7C6BFF;
  --brand-dark:#4434D4;
  --brand-deep:#2E2B8C;
  --brand-light:#F0EEFF;
  --brand-lighter:#F8F7FF;

  /* 语义色 */
  --ink:#061B31;
  --ink-2:#3F4D66;
  --ink-3:#64748D;
  --bg:#FFFFFF;
  --bg-2:#F7F9FC;
  --line:#E5EDF5;
  --ok:#12A150;
  --warn:#E8912C;

  /* 尺寸 */
  --radius:16px;
  --radius-lg:24px;
  --shadow-sm:0 2px 8px rgba(50,50,93,.10);
  --shadow:0 8px 28px rgba(50,50,93,.16);
  --shadow-lg:0 20px 60px rgba(50,50,93,.22);
  --maxw:1200px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",Roboto,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.7;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
a{text-decoration:none;color:inherit}
img{max-width:100%;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.center{text-align:center}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 30px;border-radius:999px;font-size:16px;font-weight:600;
  cursor:pointer;border:none;transition:all .25s ease;white-space:nowrap;
}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 8px 22px rgba(83,58,253,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 32px rgba(83,58,253,.42)}
.btn-ghost{background:#fff;color:var(--brand);border:1.5px solid var(--line)}
.btn-ghost:hover{border-color:var(--brand);background:var(--brand-lighter)}
.btn-white{background:#fff;color:var(--brand);box-shadow:var(--shadow)}
.btn-white:hover{transform:translateY(-2px)}
.btn-outline-white{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.5)}
.btn-outline-white:hover{background:rgba(255,255,255,.12)}
.btn-sm{padding:10px 20px;font-size:14px}

/* ============ 通用排版 ============ */
.eyebrow{
  display:inline-block;padding:6px 14px;border-radius:999px;
  background:var(--brand-light);color:var(--brand);
  font-size:13px;font-weight:600;letter-spacing:.3px;margin-bottom:18px;
}
h1{font-size:clamp(30px,5vw,52px);line-height:1.2;letter-spacing:-.02em;font-weight:800}
h2{font-size:clamp(24px,3.4vw,36px);line-height:1.25;letter-spacing:-.01em;font-weight:700}
h3{font-size:20px;font-weight:700;line-height:1.35}
.lead{font-size:18px;color:var(--ink-2);line-height:1.8}
.muted{color:var(--ink-3)}
section{padding:80px 0}
.sec-head{max-width:760px;margin:0 auto 52px;text-align:center}
.sec-head h2{margin-bottom:14px}
.sec-head p{font-size:17px;color:var(--ink-2)}

/* ============ 导航 ============ */
.nav{
  position:sticky;top:0;z-index:100;background:rgba(255,255,255,.88);
  backdrop-filter:blur(14px);border-bottom:1px solid var(--line);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:18px;letter-spacing:-.01em}
.logo-mark{
  width:30px;height:30px;border-radius:9px;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:15px;font-weight:800;flex-shrink:0;
}
.logo-tag{
  font-size:11px;font-weight:600;color:var(--brand);background:var(--brand-light);
  padding:3px 8px;border-radius:999px;margin-left:2px;
}
.nav-menu{display:flex;align-items:center;gap:30px}
.nav-menu a{font-size:15px;color:var(--ink-2);font-weight:500;transition:color .2s}
.nav-menu a:hover,.nav-menu a.active{color:var(--brand)}
.nav-cta{display:flex;align-items:center;gap:14px}
.nav-burger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:6px}
.nav-burger span{width:22px;height:2px;background:var(--ink);border-radius:2px;transition:.25s}

/* ============ Hero ============ */
.hero{
  position:relative;overflow:hidden;padding:96px 0 88px;
  background:linear-gradient(180deg,var(--brand-lighter) 0%,#fff 100%);
}
.hero::before{
  content:"";position:absolute;top:-180px;right:-140px;width:560px;height:560px;
  border-radius:50%;background:radial-gradient(circle,rgba(83,58,253,.13),transparent 68%);
}
.hero::after{
  content:"";position:absolute;bottom:-220px;left:-160px;width:480px;height:480px;
  border-radius:50%;background:radial-gradient(circle,rgba(124,107,255,.11),transparent 68%);
}
.hero .wrap{position:relative;z-index:1}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:64px;align-items:center}
.hero h1{margin-bottom:22px}
.hero h1 em{font-style:normal;background:linear-gradient(135deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero .lead{margin-bottom:32px;max-width:560px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:28px}
.hero-note{font-size:14px;color:var(--ink-3);display:flex;align-items:center;gap:8px}
.hero-note::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 4px rgba(18,161,80,.14)}

/* 漏斗卡片 */
.funnel-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:28px;box-shadow:var(--shadow-lg);
}
.funnel-card h4{font-size:14px;color:var(--ink-3);font-weight:600;margin-bottom:18px;letter-spacing:.4px}
.funnel{display:flex;flex-direction:column;gap:9px}
.funnel-step{
  display:flex;align-items:center;gap:12px;padding:11px 15px;border-radius:12px;
  background:var(--bg-2);font-size:14.5px;font-weight:600;color:var(--ink-2);
}
.funnel-step .dot{
  width:23px;height:23px;border-radius:7px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  font-size:12px;font-weight:700;color:#fff;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
}
.funnel-step:nth-child(1){background:var(--brand-light);color:var(--brand)}
.funnel-step:nth-child(2){background:#EFEBFF}
.funnel-step:nth-child(3){background:#F2EFFF}
.funnel-step:nth-child(4){background:#F5F3FF}
.funnel-step:nth-child(5){background:#F8F7FF}
.funnel-step:nth-child(n+6){background:var(--bg-2)}

/* ============ 通用卡片网格 ============ */
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 26px;transition:all .25s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#D8DDF9}
.card .ico{
  width:46px;height:46px;border-radius:13px;margin-bottom:18px;
  background:var(--brand-light);color:var(--brand);
  display:flex;align-items:center;justify-content:center;font-size:22px;font-weight:800;
}
.card h3{margin-bottom:10px;font-size:18px}
.card p{font-size:15px;color:var(--ink-2);line-height:1.75}

/* ============ 痛点区块 ============ */
.pain{background:var(--bg-2)}
.pain-item{
  display:flex;gap:16px;padding:26px;background:#fff;border-radius:var(--radius);
  border:1px solid var(--line);border-left:3px solid var(--warn);
}
.pain-item .num{font-size:26px;font-weight:800;color:#E8912C;line-height:1;flex-shrink:0}
.pain-item h3{font-size:17px;margin-bottom:8px}
.pain-item p{font-size:15px;color:var(--ink-2)}

/* ============ 双入口 ============ */
.entry{display:grid;grid-template-columns:1fr 1fr;gap:26px}
.entry-card{
  position:relative;overflow:hidden;padding:40px 34px;border-radius:var(--radius-lg);
  border:1px solid var(--line);background:#fff;transition:all .28s ease;
}
.entry-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.entry-card::after{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:linear-gradient(90deg,var(--brand),var(--brand-2));
}
.entry-card.b::after{background:linear-gradient(90deg,#12A150,#3DD68C)}
.entry-card .tag{
  display:inline-block;padding:4px 12px;border-radius:999px;
  font-size:12px;font-weight:700;margin-bottom:16px;
  background:var(--brand-light);color:var(--brand);
}
.entry-card.b .tag{background:#E7F7EE;color:var(--ok)}
.entry-card h3{font-size:23px;margin-bottom:14px}
.entry-card p{font-size:15px;color:var(--ink-2);margin-bottom:22px;line-height:1.75}
.entry-card ul{list-style:none;margin-bottom:26px}
.entry-card li{
  font-size:14.5px;color:var(--ink-2);padding:7px 0 7px 26px;position:relative;
}
.entry-card li::before{
  content:"";position:absolute;left:0;top:15px;width:15px;height:15px;border-radius:50%;
  background:var(--brand-light);
  background-image:linear-gradient(135deg,var(--brand),var(--brand-2));
  -webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='white' d='M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z'/%3E%3C/svg%3E") center/11px no-repeat;
  mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='white' d='M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z'/%3E%3C/svg%3E") center/11px no-repeat;
}
.entry-card.b li::before{background-image:linear-gradient(135deg,#12A150,#3DD68C)}

/* ============ 流程步骤 ============ */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;counter-reset:step}
.step{position:relative;padding:26px 20px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
.step::before{
  counter-increment:step;content:counter(step,decimal-leading-zero);
  font-size:13px;font-weight:800;color:var(--brand);
  display:block;margin-bottom:12px;letter-spacing:1px;
}
.step h3{font-size:16px;margin-bottom:8px}
.step p{font-size:14px;color:var(--ink-3);line-height:1.7}

/* ============ 数据条 ============ */
.stats{background:linear-gradient(135deg,var(--brand-deep),var(--brand));border-radius:var(--radius-lg);padding:52px 40px;color:#fff}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:32px;text-align:center}
.stat-num{font-size:38px;font-weight:800;line-height:1.1;margin-bottom:8px}
.stat-label{font-size:14px;opacity:.82}

/* ============ FAQ ============ */
.faq-list{max-width:840px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--line);padding:22px 0}
.faq-item h3{font-size:17px;margin-bottom:10px;display:flex;gap:10px;align-items:flex-start}
.faq-item h3::before{content:"Q";color:var(--brand);font-weight:800;flex-shrink:0}
.faq-item p{font-size:15px;color:var(--ink-2);padding-left:26px}

/* ============ CTA 区块 ============ */
.cta{background:linear-gradient(135deg,var(--brand-deep),var(--brand));border-radius:var(--radius-lg);padding:64px 44px;text-align:center;color:#fff;position:relative;overflow:hidden}
.cta::before{content:"";position:absolute;top:-120px;right:-80px;width:360px;height:360px;border-radius:50%;background:rgba(255,255,255,.07)}
.cta h2{color:#fff;margin-bottom:16px;position:relative}
.cta p{color:rgba(255,255,255,.86);font-size:17px;margin-bottom:30px;max-width:600px;margin-left:auto;margin-right:auto;position:relative}
.cta-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;position:relative}

/* ============ 页脚 ============ */
.footer{background:var(--ink);color:rgba(255,255,255,.72);padding:56px 0 30px;margin-top:0}
.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;padding-bottom:38px;border-bottom:1px solid rgba(255,255,255,.1)}
.footer .logo{color:#fff;font-size:17px;margin-bottom:16px}
.footer h5{color:#fff;font-size:14px;font-weight:700;margin-bottom:16px}
.footer ul{list-style:none}
.footer li{margin-bottom:10px}
.footer a{font-size:14px;color:rgba(255,255,255,.68);transition:color .2s}
.footer a:hover{color:#fff}
.footer-desc{font-size:13.5px;line-height:1.8;margin-bottom:14px;color:rgba(255,255,255,.6)}
.footer-contact{font-size:13.5px;color:rgba(255,255,255,.6)}
.footer-contact b{color:rgba(255,255,255,.82);margin-right:6px}
.footer-contact a{color:#fff}
.footer-legal{padding:24px 0;border-bottom:1px solid rgba(255,255,255,.1)}
.footer-legal p{font-size:12.5px;line-height:1.85;color:rgba(255,255,255,.46);margin-bottom:6px}
.footer-legal b{color:rgba(255,255,255,.66)}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;padding-top:22px;font-size:12.5px;color:rgba(255,255,255,.46)}
.footer-bottom .icp a{color:rgba(255,255,255,.58)}
.footer-bottom .icp a:hover{color:#fff}

/* ============ 面包屑 ============ */
.crumb{padding:18px 0 0;font-size:13.5px;color:var(--ink-3)}
.crumb a{color:var(--brand)}
.crumb span{margin:0 7px;opacity:.5}

/* ============ 页面头（子页通用）============ */
.page-hero{
  padding:64px 0 52px;
  background:linear-gradient(180deg,var(--brand-lighter),#fff);
  border-bottom:1px solid var(--line);
}
.page-hero h1{font-size:clamp(28px,4vw,44px);margin-bottom:18px}
.page-hero .lead{max-width:720px}

/* ==========================================================================
   活动驱动型组件（参考 aitinkerers 风格）
   ========================================================================== */

/* ---- 大字宣言 Hero ---- */
.hero-tinker{padding:104px 0 96px;background:linear-gradient(180deg,var(--brand-lighter) 0%,#fff 78%);position:relative;overflow:hidden}
.hero-tinker::before{content:"";position:absolute;top:-200px;right:-160px;width:640px;height:640px;border-radius:50%;background:radial-gradient(circle,rgba(83,58,253,.14),transparent 66%)}
.hero-tinker .wrap{position:relative;z-index:1}
.hero-tinker h1{
  font-size:clamp(34px,6.2vw,66px);line-height:1.08;letter-spacing:-.035em;font-weight:800;
  margin-bottom:24px;max-width:900px;
}
.hero-tinker .lead{font-size:clamp(16px,1.6vw,19px);color:var(--ink-2);line-height:1.75;max-width:680px;margin-bottom:34px}
.hero-tinker .hero-actions{margin-bottom:0}

/* ---- 数据条（横排，数字大）---- */
.metrics{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#fff}
.metrics-inner{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.metric{padding:34px 26px;border-right:1px solid var(--line);text-align:left}
.metric:last-child{border-right:none}
.metric-num{font-size:clamp(30px,4vw,46px);font-weight:800;line-height:1;letter-spacing:-.03em;margin-bottom:10px;background:linear-gradient(135deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.metric-label{font-size:14px;color:var(--ink-3);font-weight:500}

/* ---- 活动列表 ---- */
.events{display:flex;flex-direction:column;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden}
.event{
  display:grid;grid-template-columns:112px 1fr auto;gap:26px;align-items:center;
  padding:26px 28px;background:#fff;transition:background .2s;text-decoration:none;color:inherit;
}
.event:hover{background:var(--brand-lighter)}
.event-date{display:flex;flex-direction:column;gap:3px}
.event-day{font-size:23px;font-weight:800;line-height:1;color:var(--ink)}
.event-mon{font-size:12.5px;color:var(--ink-3);font-weight:600;letter-spacing:.4px}
.event-type{display:inline-block;padding:3px 9px;border-radius:5px;font-size:11px;font-weight:700;background:var(--brand-light);color:var(--brand);margin-bottom:9px}
.event-type.hack{background:#FFF1E0;color:#B26A0B}
.event-type.demo{background:#E7F7EE;color:#0B7A3D}
.event-title{font-size:17px;font-weight:700;line-height:1.45;margin-bottom:7px}
.event-meta{font-size:14px;color:var(--ink-3);display:flex;gap:16px;flex-wrap:wrap}
.event-cta{
  padding:9px 20px;border-radius:999px;border:1.5px solid var(--line);
  font-size:14px;font-weight:600;color:var(--brand);white-space:nowrap;transition:.22s;
}
.event:hover .event-cta{border-color:var(--brand);background:#fff}
.event-cta.disabled{color:var(--ink-3);border-style:dashed}

/* ---- 成员名录墙 ---- */
.people-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.person{
  padding:20px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;
  transition:.22s;min-height:132px;display:flex;flex-direction:column;
}
.person:hover{transform:translateY(-3px);box-shadow:var(--shadow-sm);border-color:#D8DDF9}
.person-top{display:flex;align-items:center;gap:11px;margin-bottom:12px}
.person-ava{
  width:38px;height:38px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  font-size:14px;font-weight:700;color:#fff;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
}
.person-name{font-size:14.5px;font-weight:700;line-height:1.3}
.person-role{font-size:12.5px;color:var(--ink-3);line-height:1.4}
.person-skills{display:flex;flex-wrap:wrap;gap:6px;margin-top:auto}
.skill-tag{padding:3px 9px;border-radius:5px;background:var(--bg-2);font-size:11.5px;color:var(--ink-2);font-weight:500}

/* 占位成员卡 */
.person.placeholder{
  background:var(--bg-2);border-style:dashed;align-items:center;justify-content:center;text-align:center;
}
.person.placeholder .person-ava{background:#DFE3F0;color:#9AA3BC}
.person.placeholder .person-name{color:var(--ink-3);font-weight:600}
.person.placeholder:hover{transform:none;box-shadow:none;border-color:var(--line)}

/* ---- 宣言式区块（黑底）---- */
.manifesto{background:var(--ink);color:#fff;padding:88px 0}
.manifesto h2{color:#fff;font-size:clamp(26px,3.6vw,42px);line-height:1.25;letter-spacing:-.02em;max-width:840px;margin-bottom:26px}
.manifesto p{color:rgba(255,255,255,.72);font-size:17px;line-height:1.85;max-width:720px}
.manifesto-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.14);margin-top:52px;border-radius:var(--radius);overflow:hidden}
.mf-step{background:var(--ink);padding:28px 24px}
.mf-num{font-size:12px;font-weight:800;color:var(--brand-2);letter-spacing:1.2px;margin-bottom:14px}
.mf-step h3{color:#fff;font-size:16px;margin-bottom:9px}
.mf-step p{color:rgba(255,255,255,.6);font-size:14px;line-height:1.7}

/* ---- 城市/区域条 ---- */
.cities{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.city{padding:20px 22px;border:1px solid var(--line);border-radius:var(--radius);background:#fff;transition:.22s}
.city:hover{border-color:var(--brand);background:var(--brand-lighter)}
.city-name{font-size:16px;font-weight:700;margin-bottom:6px}
.city-next{font-size:13px;color:var(--ink-3)}
.city-next b{color:var(--brand);font-weight:600}

/* ---- 拉人横幅 ---- */
.recruit{
  display:grid;grid-template-columns:1fr auto;gap:34px;align-items:center;
  padding:40px 44px;border-radius:var(--radius-lg);
  background:linear-gradient(135deg,var(--brand-deep),var(--brand));color:#fff;
}
.recruit h3{color:#fff;font-size:clamp(20px,2.4vw,27px);margin-bottom:11px;line-height:1.35}
.recruit p{color:rgba(255,255,255,.82);font-size:15.5px;line-height:1.7}
.recruit-actions{display:flex;gap:12px;flex-wrap:wrap}

/* ==========================================================================
   第三轮：进一步对齐 aitinkerers（Talks / 时间感城市 / Sponsor / 密排人墙）
   ========================================================================== */

/* ---- Recent Talks & Demos 卡片（讲者头像 + 标题 + 摘要 + 长标签）---- */
.talks{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.talk{
  display:flex;flex-direction:column;padding:26px 24px;background:#fff;
  border:1px solid var(--line);border-radius:var(--radius);transition:.22s;
}
.talk:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#D8DDF9}
.talk-head{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.talk-ava{
  width:42px;height:42px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  font-size:15px;font-weight:700;color:#fff;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
}
.talk-who{font-size:14.5px;font-weight:700;line-height:1.25}
.talk-sub{font-size:12.5px;color:var(--ink-3);line-height:1.35}
.talk-title{font-size:17px;font-weight:700;line-height:1.45;margin-bottom:10px}
.talk-desc{font-size:14px;color:var(--ink-2);line-height:1.7;margin-bottom:16px}
.talk-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:auto}
.talk-tag{padding:3px 9px;border-radius:5px;background:var(--brand-light);font-size:11.5px;color:var(--brand);font-weight:600}
.talk-foot{font-size:12.5px;color:var(--ink-3);margin-top:14px;display:flex;align-items:center;gap:7px}
.talk-foot::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--ok)}

/* ---- 城市：带 Next / Last 时间感（aitinkerers 式）---- */
.city-time{display:flex;align-items:center;gap:7px;font-size:13px;color:var(--ink-3);margin-bottom:4px}
.city-dot{width:7px;height:7px;border-radius:50%;background:var(--line);flex-shrink:0}
.city-dot.next{background:var(--ok);box-shadow:0 0 0 3px rgba(18,161,80,.14)}
.city-dot.last{background:#C3CBDD}
.city-time b{color:var(--ink-2);font-weight:700}
.city-time.next b{color:var(--ok)}
.city-sub{font-size:12.5px;color:var(--ink-3);margin-top:5px}

/* ---- Sponsor / 合作方条 ---- */
.sponsor{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg-2);padding:30px 0}
.sponsor-inner{display:flex;align-items:center;justify-content:space-between;gap:26px;flex-wrap:wrap}
.sponsor-label{font-size:13px;font-weight:700;color:var(--ink-3);letter-spacing:.6px;flex-shrink:0}
.sponsor-list{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.sponsor-item{
  padding:10px 20px;border-radius:999px;background:#fff;border:1px dashed var(--line);
  font-size:13.5px;font-weight:600;color:var(--ink-2);
}
.sponsor-item b{color:var(--brand)}
.sponsor-item.link{border-style:solid;transition:.2s}
.sponsor-item.link:hover{border-color:var(--brand);color:var(--brand)}

/* ---- 小标题行（左对齐 + 右侧 View all）---- */
.sec-bar{display:flex;justify-content:space-between;align-items:flex-end;flex-wrap:wrap;gap:16px;margin-bottom:36px}
.sec-bar-l h2{margin-bottom:8px}
.sec-bar-l p{font-size:16px;color:var(--ink-3)}

/* ---- 名字墙密排（6 列，aitinkerers 式）---- */
.people-wall{display:grid;grid-template-columns:repeat(6,1fr);gap:12px}
.pw-card{
  padding:16px 15px;border:1px solid var(--line);border-radius:13px;background:#fff;
  transition:.2s;min-height:112px;display:flex;flex-direction:column;
}
.pw-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-sm);border-color:#D8DDF9}
.pw-top{display:flex;align-items:center;gap:9px;margin-bottom:10px}
.pw-ava{
  width:32px;height:32px;border-radius:50%;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  font-size:12.5px;font-weight:700;color:#fff;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
}
.pw-name{font-size:13.5px;font-weight:700;line-height:1.25}
.pw-role{font-size:11.5px;color:var(--ink-3);line-height:1.3}
.pw-skills{display:flex;flex-wrap:wrap;gap:5px;margin-top:auto}
.pw-skills span{padding:2px 7px;border-radius:4px;background:var(--bg-2);font-size:10.5px;color:var(--ink-2)}
.pw-card.empty{background:var(--bg-2);border-style:dashed;align-items:center;justify-content:center;text-align:center}
.pw-card.empty .pw-ava{background:#DFE3F0;color:#9AA3BC}
.pw-card.empty .pw-name{color:var(--ink-3);font-weight:600}
.pw-card.empty:hover{transform:none;box-shadow:none;border-color:var(--line)}

/* ============ 响应式 ============ */
@media(max-width:1080px){
  .hero-grid{grid-template-columns:1fr;gap:44px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:26px}
  .footer-top{grid-template-columns:1fr 1fr;gap:32px}
  .metrics-inner{grid-template-columns:repeat(2,1fr)}
  .metric:nth-child(2){border-right:none}
  .metric:nth-child(1),.metric:nth-child(2){border-bottom:1px solid var(--line)}
  .people-grid{grid-template-columns:repeat(3,1fr)}
  .manifesto-flow{grid-template-columns:repeat(2,1fr)}
  .cities{grid-template-columns:repeat(2,1fr)}
  .recruit{grid-template-columns:1fr;gap:24px}
  .talks{grid-template-columns:repeat(2,1fr)}
  .people-wall{grid-template-columns:repeat(3,1fr)}
}
@media(max-width:820px){
  .nav-menu{
    position:fixed;top:70px;left:0;right:0;background:#fff;flex-direction:column;
    align-items:stretch;gap:0;padding:12px 24px 20px;border-bottom:1px solid var(--line);
    box-shadow:var(--shadow);display:none;
  }
  .nav-menu.open{display:flex}
  .nav-menu a{padding:13px 0;border-bottom:1px solid var(--bg-2);font-size:16px}
  .nav-burger{display:flex}
  .nav-cta .btn{display:none}
  section{padding:60px 0}
  .grid-3{grid-template-columns:1fr}
  .grid-2{grid-template-columns:1fr}
  .entry{grid-template-columns:1fr}
  .steps{grid-template-columns:1fr}
  .stats{padding:40px 26px}
  .cta{padding:46px 26px}
  .hero{padding:64px 0 56px}
  .hero-tinker{padding:64px 0 56px}
  .event{grid-template-columns:1fr;gap:14px;padding:22px}
  .event-cta{justify-self:start}
  .footer-top{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column}
  .talks{grid-template-columns:1fr}
  .people-wall{grid-template-columns:repeat(2,1fr)}
  .sec-bar{margin-bottom:28px}
}
@media(max-width:520px){
  .grid-4{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:1fr 1fr}
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn{width:100%}
  .metrics-inner{grid-template-columns:1fr}
  .metric{border-right:none;border-bottom:1px solid var(--line);padding:24px 20px}
  .metric:last-child{border-bottom:none}
  .people-grid{grid-template-columns:1fr 1fr}
  .manifesto-flow{grid-template-columns:1fr}
  .cities{grid-template-columns:1fr}
  .recruit{padding:30px 24px}
  .recruit-actions{flex-direction:column;align-items:stretch}
  .recruit-actions .btn{width:100%}
  .people-wall{grid-template-columns:1fr 1fr}
  .sponsor-inner{justify-content:center;text-align:center}
}