/* ===== Tokens ===== */
:root{
  --blue:#3E74F8;
  --blue-deep:#2442A0;
  --blue-ink:#0E2150;
  --ink:#16264d;
  --ink-soft:#4a5d85;
  --line:rgba(36,66,160,.12);
  --card:rgba(255,255,255,.72);
  --radius:20px;
  --radius-lg:28px;
  --shadow-sm:0 4px 16px rgba(36,66,160,.08);
  --shadow:0 18px 50px rgba(36,66,160,.12);
  --shadow-lg:0 30px 70px rgba(36,66,160,.20);
  --maxw:1160px;
  --font:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  color:var(--ink);
  background:#F5F9FF;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}

/* ===== 背景层 ===== */
.bg-layer{position:fixed;inset:0;z-index:0;overflow:hidden;pointer-events:none;
  background:linear-gradient(180deg,#EAF3FF 0%,#DCEAFF 38%,#cfe0ff 60%,#F5F9FF 100%)}
.bg-glow{position:absolute;border-radius:50%;filter:blur(70px);opacity:.55}
.bg-glow--1{width:520px;height:520px;top:-160px;right:-120px;
  background:radial-gradient(circle,#7fa6ff,transparent 70%)}
.bg-glow--2{width:460px;height:460px;top:340px;left:-160px;
  background:radial-gradient(circle,#bcd2ff,transparent 70%);opacity:.4}
.starfield{position:absolute;inset:0}
.star{position:absolute;pointer-events:none;will-change:transform,opacity}
.star--dot{background:#fff;border-radius:50%}
.star--4 svg,.star--5 svg{display:block;width:100%;height:100%;
  filter:drop-shadow(0 0 3px rgba(255,255,255,.85))}
.star svg .fill{fill:#fff}
@keyframes twinkle{0%,100%{opacity:.25;transform:scale(.7)}50%{opacity:.95;transform:scale(1)}}
@keyframes shine{0%,100%{opacity:.45;transform:scale(.8) rotate(0deg)}
  45%{opacity:1;transform:scale(1.3) rotate(10deg)}75%{opacity:.7;transform:scale(.95)}}
/* 流星：亮头朝运动方向（左下），尾迹向右上拖尾 */
.meteor{position:absolute;top:10px;left:78%;width:120px;height:2px;opacity:0;
  background:linear-gradient(90deg,#fff,transparent);border-radius:2px;
  transform:rotate(-30deg);animation:meteor 9s linear infinite;
  box-shadow:0 0 6px rgba(255,255,255,.7)}
.meteor--2{left:55%;top:-20px;width:90px;animation-delay:2.4s}
.meteor--3{left:40%;top:30px;width:150px;animation-delay:4.6s}
.meteor--4{left:85%;top:-30px;width:100px;animation-delay:6.2s}
.meteor--5{left:25%;top:-10px;width:130px;animation-delay:7.6s}
@keyframes meteor{
  0%{opacity:0;transform:translate(0,0) rotate(-30deg)}
  10%{opacity:.9}
  30%{opacity:0;transform:translate(-300px,200px) rotate(-30deg)}
  100%{opacity:0;transform:translate(-300px,200px) rotate(-30deg)}
}
main,header,footer{position:relative;z-index:2}

/* ===== 容器 ===== */
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;
  padding:13px 28px;border-radius:999px;font-weight:600;font-size:15px;
  border:1.5px solid transparent;cursor:pointer;
  transition:transform .25s ease,box-shadow .25s ease,background .3s ease,color .3s ease}
.btn--primary{background:linear-gradient(120deg,var(--blue),var(--blue-deep));color:#fff;
  box-shadow:0 12px 28px rgba(36,66,160,.32)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 18px 38px rgba(36,66,160,.42)}
.btn--outline{border-color:#fff;color:#fff;background:rgba(255,255,255,.10);backdrop-filter:blur(6px)}
.btn--outline:hover{background:rgba(255,255,255,.22);transform:translateY(-2px)}
.btn--outline-dark{border-color:var(--blue);color:var(--blue-deep);background:transparent}
.btn--outline-dark:hover{background:var(--blue);color:#fff;transform:translateY(-2px)}
.btn--ghost-light{border-color:rgba(255,255,255,.7);color:#fff;background:transparent}
.btn--ghost-light:hover{background:rgba(255,255,255,.16)}
.btn--lg{padding:16px 42px;font-size:17px;margin-top:32px}

/* ===== 导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;
  background:rgba(28,50,120,.82);backdrop-filter:blur(14px);
  box-shadow:0 6px 22px rgba(14,33,80,.22)}
.nav__inner{max-width:var(--maxw);margin:0 auto;padding:15px 24px;display:flex;align-items:center;gap:24px}
.brand{display:flex;align-items:center;gap:11px}
.brand__logo{width:40px;height:40px;border-radius:12px;object-fit:cover;
  box-shadow:0 4px 12px rgba(36,66,160,.25)}
.brand__text{font-size:18px;font-weight:700;color:#fff;letter-spacing:.4px;
  text-shadow:0 1px 10px rgba(14,33,80,.25)}
.brand__text i{opacity:.5;font-style:normal;margin:0 5px}
.brand__text b{font-family:"Inter",sans-serif;font-weight:800}
.menu{display:flex;gap:34px;margin-left:auto}
.menu a{color:#fff;font-size:15px;font-weight:500;opacity:.92;position:relative;transition:opacity .25s,color .35s}
.menu a::after{content:"";position:absolute;left:0;bottom:-6px;width:0;height:2px;
  background:currentColor;border-radius:2px;transition:width .3s}
.menu a:hover::after,.menu a.active::after{width:100%}
.nav__actions{display:flex;gap:10px;align-items:center}
.nav__actions .btn{padding:8px 20px;font-size:14px}
.nav__collapse{display:contents}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;margin-left:auto;padding:6px}
.hamburger span{width:26px;height:2.5px;background:#fff;border-radius:2px;transition:.3s;transform-origin:center}
.hamburger.active span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}
.hamburger.active span:nth-child(2){opacity:0}
.hamburger.active span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}

/* ===== 通用排版 ===== */
.eyebrow{font-family:"Inter",sans-serif;letter-spacing:3px;font-size:12.5px;
  color:var(--blue);font-weight:700;margin-bottom:12px}
.eyebrow--center{text-align:center}
.title{font-size:36px;font-weight:900;color:var(--blue-ink);letter-spacing:.5px}
.title--center{text-align:center}
.head{text-align:center;margin-bottom:52px}
.head__sub{text-align:center;color:var(--ink-soft);margin-top:12px;font-size:16px}
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
.center{text-align:center;margin-top:44px}

/* ===== Hero ===== */
.hero{position:relative;overflow:hidden;min-height:100vh;display:flex;align-items:center;justify-content:center;
  padding:130px 24px 80px;text-align:center}
.hero__sky{position:absolute;inset:0;z-index:0;overflow:hidden;
  background:linear-gradient(180deg,#1C3278 0%,#2E54C6 32%,#5B86EE 64%,#A9C5F6 88%,#D6E4FC 100%)}
.hero__inner{position:relative;z-index:2;max-width:760px;display:flex;flex-direction:column;align-items:center}
.hero__emblem{position:relative;width:172px;height:172px;margin-bottom:34px}
.emblem__logo{width:100%;height:100%;border-radius:38px;object-fit:cover;position:relative;z-index:2;
  box-shadow:0 20px 50px rgba(14,33,80,.45);border:3px solid rgba(255,255,255,.92)}
.emblem__star{position:absolute;width:12px;height:12px;z-index:3;
  background:#fff;
  clip-path:polygon(50% 0%,60% 40%,100% 50%,60% 60%,50% 100%,40% 60%,0% 50%,40% 40%);
  filter:drop-shadow(0 0 8px #fff);animation:twinkle 3s ease-in-out infinite}
.emblem__star--a{top:-6px;right:18px}
.emblem__star--b{bottom:14px;left:-10px;width:8px;height:8px;animation-delay:1.4s}
.hero__eyebrow{color:rgba(255,255,255,.92);font-weight:600;letter-spacing:1.5px;
  font-size:15px;margin-bottom:16px;text-shadow:0 1px 12px rgba(14,33,80,.4)}
.hero__title{font-size:clamp(44px,9vw,84px);font-weight:900;line-height:1.05;
  color:#fff;letter-spacing:1px;text-shadow:0 2px 26px rgba(14,33,80,.38)}
.hero__title span{font-family:"Inter",sans-serif;font-weight:800;color:#C7DBFF}
.hero__subtitle{font-size:clamp(17px,2.6vw,22px);color:rgba(255,255,255,.92);
  margin-top:18px;font-weight:500;text-shadow:0 1px 14px rgba(14,33,80,.35)}
.hero__actions{display:flex;gap:16px;justify-content:center;margin-top:40px;flex-wrap:wrap}
.hero__scroll{margin-top:60px;width:26px;height:42px;border:2px solid rgba(36,66,160,.5);
  border-radius:14px;position:relative}
.hero__scroll span{position:absolute;top:8px;left:50%;width:4px;height:8px;border-radius:2px;
  background:var(--blue-deep);transform:translateX(-50%);animation:scrolldot 1.8s ease-in-out infinite}
@keyframes scrolldot{0%{opacity:0;transform:translate(-50%,0)}40%{opacity:1}80%{opacity:0;transform:translate(-50%,14px)}100%{opacity:0}}

/* ===== 品牌理念 ===== */
.vision{padding:96px 0}
.vision__grid{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.lead{font-size:17px;color:var(--ink-soft);margin:18px 0 26px}
.vision__tags{display:flex;flex-direction:column;gap:12px}
.tag{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 18px;
  font-size:14.5px;color:var(--ink-soft);box-shadow:var(--shadow-sm)}
.tag__k{display:inline-block;font-family:"Inter",sans-serif;font-weight:800;color:var(--blue-deep);
  margin-right:10px;background:rgba(62,116,248,.1);padding:2px 9px;border-radius:8px}
.vision__panel{background:linear-gradient(160deg,#fff,#eef4ff);border:1px solid var(--line);
  border-radius:var(--radius-lg);padding:38px 36px;box-shadow:var(--shadow);
  display:grid;grid-template-columns:1fr 1fr;gap:26px 20px}
.stat__num{font-family:"Inter",sans-serif;font-size:42px;font-weight:800;
  color:var(--blue-deep);line-height:1}
.stat__num span{font-size:24px;color:var(--blue)}
.stat__label{font-size:14px;color:var(--ink-soft);margin-top:6px}
.vision__note{grid-column:1/-1;border-top:1px dashed var(--line);padding-top:20px;
  font-size:14.5px;color:var(--blue-deep);font-weight:500}

/* ===== 核心业务 ===== */
.business{padding:90px 0}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.card{background:var(--card);backdrop-filter:blur(10px);border:1px solid var(--line);
  border-radius:var(--radius);padding:38px 32px;box-shadow:var(--shadow-sm);
  transition:transform .3s ease,box-shadow .3s ease,border-color .3s ease}
.card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg);border-color:rgba(62,116,248,.4)}
.card__icon{width:58px;height:58px;border-radius:16px;display:flex;align-items:center;justify-content:center;
  color:var(--blue-deep);background:linear-gradient(160deg,#fff,#e6efff);
  box-shadow:var(--shadow-sm);margin-bottom:22px}
.card__icon svg{width:30px;height:30px}
.card__title{font-size:21px;font-weight:700;color:var(--blue-ink);margin-bottom:12px}
.card__desc{font-size:15px;color:var(--ink-soft);margin-bottom:22px}
.card__link{color:var(--blue-deep);font-weight:600;font-size:15px;display:inline-flex;align-items:center;gap:6px}
.card__link em{font-style:normal;transition:transform .25s}
.card__link:hover em{transform:translateX(4px)}

/* ===== 嘉宾墙 ===== */
.guests{padding:90px 0}
.guest-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.guest{background:var(--card);backdrop-filter:blur(10px);border:1px solid var(--line);
  border-radius:var(--radius);padding:28px 24px;text-align:center;box-shadow:var(--shadow-sm);
  transition:transform .3s ease,box-shadow .3s ease}
.guest:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg)}
.guest__avatar{width:72px;height:72px;border-radius:50%;margin:0 auto 14px;
  display:flex;align-items:center;justify-content:center;font-family:"Inter",sans-serif;
  font-weight:800;font-size:26px;color:#fff;
  background:linear-gradient(135deg,var(--blue),var(--blue-deep));
  box-shadow:0 8px 20px rgba(36,66,160,.3);border:3px solid #fff}
.guest__name{font-weight:700;font-size:17px;color:var(--blue-ink)}
.guest__role{font-size:13px;color:var(--blue);margin:5px 0 12px;font-weight:500;opacity:.9}
.guest__intro{font-size:13.5px;color:var(--ink-soft);line-height:1.65}

/* ===== 社区招募 ===== */
.community{padding:96px 0;
  background:linear-gradient(180deg,transparent,rgba(36,66,160,.06) 40%,rgba(36,66,160,.14))}
.community__card{background:linear-gradient(150deg,#2c4bb0,#1c2f78);
  border-radius:var(--radius-lg);padding:60px 56px;box-shadow:var(--shadow-lg);
  color:#fff;display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center;
  position:relative;overflow:hidden}
.community__card::after{content:"";position:absolute;right:-80px;top:-80px;width:280px;height:280px;
  border-radius:50%;background:radial-gradient(circle,rgba(127,166,255,.5),transparent 70%)}
.community__title{font-size:clamp(26px,3.6vw,36px);font-weight:800;line-height:1.25}
.community__sub{margin-top:16px;font-size:16px;opacity:.9}
.community__cols{display:grid;grid-template-columns:1fr 1fr;gap:30px;position:relative;z-index:2}
.community__cols h4{font-size:16px;margin-bottom:14px;font-weight:700}
.community__cols ul{list-style:none}
.community__cols li{padding:8px 0 8px 22px;position:relative;font-size:14.5px;opacity:.92}
.community__cols li::before{content:"";position:absolute;left:0;top:15px;width:7px;height:7px;
  border-radius:50%;background:#9bc0ff}

/* ===== 页脚 ===== */
.footer{background:var(--blue-ink);color:#cdd9f5;padding:60px 0 30px;margin-top:20px}
.footer__grid{max-width:var(--maxw);margin:0 auto;padding:0 24px;
  display:grid;grid-template-columns:1.4fr 1fr 1.2fr;gap:40px}
.footer__logo{width:50px;height:50px;border-radius:14px;background:#fff;margin-bottom:16px;
  box-shadow:0 6px 16px rgba(0,0,0,.25)}
.footer__copy{font-weight:700;color:#fff;font-size:16px}
.footer__slogan{font-size:13.5px;opacity:.7;margin-top:6px}
.footer__h{display:block;font-size:13px;letter-spacing:2px;color:#7e93c9;margin-bottom:16px;
  text-transform:uppercase;font-family:"Inter",sans-serif}
.footer__nav{display:flex;flex-direction:column;gap:12px}
.footer__nav a,.footer__contact p{opacity:.85;font-size:14.5px;transition:opacity .2s,color .2s}
.footer__nav a:hover{opacity:1;color:#fff}
.footer__contact a{color:#9bc0ff}
.footer__icp{text-align:center;margin-top:40px;font-size:12.5px;opacity:.5;
  border-top:1px solid rgba(255,255,255,.1);padding-top:22px}

/* ===== 响应式 ===== */
@media (max-width:900px){
  .nav__collapse{display:none}
  .nav__collapse.open{display:flex;position:absolute;top:100%;left:0;right:0;flex-direction:column;
    background:rgba(255,255,255,.98);backdrop-filter:blur(14px);
    box-shadow:0 14px 30px rgba(14,33,80,.16);padding:8px 0 16px}
  .menu{order:1;flex-direction:column;gap:0;margin-left:0;width:100%}
  .menu a{color:var(--blue-ink);padding:15px 28px;width:100%}
  .menu a::after{display:none}
  .nav__actions{order:2;flex-direction:column;gap:10px;width:100%;padding:10px 24px 0}
  .nav__actions .btn{width:100%}
  .nav__collapse.open .btn--ghost-light{border-color:var(--blue);color:var(--blue-deep);background:transparent}
  .nav__collapse.open .btn--ghost-light:hover{background:var(--blue);color:#fff}
  .hamburger{display:flex}
  .vision__grid{grid-template-columns:1fr;gap:40px}
  .cards{grid-template-columns:1fr}
  .guest-grid{grid-template-columns:repeat(2,1fr)}
  .community__card{grid-template-columns:1fr;padding:44px 32px;gap:34px}
  .footer__grid{grid-template-columns:1fr;gap:32px}
  .title{font-size:30px}
}
@media (max-width:520px){
  .guest-grid{grid-template-columns:1fr}
  .hero__actions{flex-direction:column;width:100%}
  .hero__actions .btn{width:100%}
  .vision__panel{grid-template-columns:1fr}
  .community__cols{grid-template-columns:1fr;gap:24px}
}