/* ============================================================
   安全自治中心 · 招新页草稿 (深色 · 红蓝 · 一镜到底)
   风格同学生会官网, 配色改为红蓝(安全主题), 增强交互动画
   ============================================================ */
:root{
  --bg:#070b14;
  --bg2:#0a101d;
  --card:#0d1424;
  --card2:#121b30;
  --line:rgba(148,168,210,.11);
  --ink:#e9edf6;
  --muted:rgba(198,209,230,.58);
  --faint:rgba(198,209,230,.33);
  --blue:#3d7bf0;
  --blue-soft:#74a4f8;
  --blue-deep:#2455c4;
  --red:#e8483d;
  --red-soft:#f27a6e;
  --red-deep:#c2342b;
  --grad:linear-gradient(120deg,var(--red),var(--blue));
  --serif:"方正仿宋_GBK","方正仿宋","FangSong","FangSong_GB2312","STFangsong","仿宋","Noto Serif SC","Songti SC",serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Segoe UI",sans-serif;
  --ease:cubic-bezier(.22,.61,.21,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--ink);
  font-family:var(--serif);
  line-height:1.9;-webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
b{font-weight:700}

/* 粒子画布 */
#fx{position:fixed;inset:0;z-index:800;pointer-events:none}

/* ---------- 顶栏 ---------- */
.topbar{
  position:fixed;inset:0 0 auto 0;z-index:60;
  display:flex;align-items:center;justify-content:space-between;
  padding:16px clamp(20px,5vw,60px);
  background:rgba(7,11,20,.62);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid transparent;transition:border-color .4s;
}
.topbar.scrolled{border-bottom-color:var(--line)}
.brand{letter-spacing:.2em;font-size:14.5px;font-weight:700}
.brand i{font-style:normal;color:var(--red);margin-left:6px;letter-spacing:.1em}
.nav{display:flex;gap:clamp(12px,2.4vw,28px);align-items:center;font-size:13.5px;letter-spacing:.18em;color:var(--muted)}
.nav a:not(.nav-cta){position:relative;transition:color .25s}
.nav a:not(.nav-cta):hover{color:var(--ink)}
.nav a:not(.nav-cta)::after{content:"";position:absolute;left:0;bottom:-5px;width:0;height:1px;background:var(--grad);transition:width .3s var(--ease)}
.nav a:not(.nav-cta):hover::after{width:100%}
.nav-cta{color:#fff;background:var(--grad);padding:7px 18px;border-radius:99px;letter-spacing:.22em;font-weight:700;transition:transform .3s,box-shadow .3s;box-shadow:0 6px 20px -8px rgba(61,123,240,.6)}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 10px 26px -8px rgba(232,72,61,.65)}
@media(max-width:720px){.nav a:not(.nav-cta){display:none}}

/* ---------- 板块一 HERO ---------- */
.hero{min-height:100svh;display:flex;align-items:center;justify-content:center;text-align:center;
  position:relative;overflow:hidden;padding:110px 22px 64px;background:var(--bg)}
/* 警灯扫光: 红蓝两束光交错扫过 */
.hero-beacon{position:absolute;inset:0;overflow:hidden;pointer-events:none}
.hero-beacon::before,.hero-beacon::after{content:"";position:absolute;top:-25%;bottom:-25%;width:55%;filter:blur(70px);opacity:.28;mix-blend-mode:screen}
.hero-beacon::before{left:-60%;background:radial-gradient(closest-side,rgba(61,123,240,.55),transparent 70%);animation:beaconBlue 7s ease-in-out infinite}
.hero-beacon::after{right:-60%;background:radial-gradient(closest-side,rgba(232,72,61,.55),transparent 70%);animation:beaconRed 7s ease-in-out infinite}
@keyframes beaconBlue{0%,100%{transform:translateX(0);opacity:.16}50%{transform:translateX(125%);opacity:.5}}
@keyframes beaconRed{0%,100%{transform:translateX(0);opacity:.16}50%{transform:translateX(-125%);opacity:.5}}
.hero::before{content:"";position:absolute;inset:0;z-index:1;
  background:
    radial-gradient(720px 460px at 50% 20%,rgba(61,123,240,.10),transparent 65%),
    linear-gradient(rgba(7,11,20,.25),rgba(7,11,20,.72) 78%,var(--bg));}
.hero-inner{position:relative;z-index:2;max-width:860px}
.shield{margin:0 auto 26px;width:58px;height:66px}
.shield svg{display:block}
.shield path{stroke-dasharray:280;stroke-dashoffset:280;animation:drawShield 1.8s var(--ease) forwards .2s}
@keyframes drawShield{to{stroke-dashoffset:0}}
.hero-eyebrow{font-size:clamp(11px,1.5vw,13px);letter-spacing:.5em;text-indent:.5em;color:var(--blue-soft);margin-bottom:28px}
/* 流光标题: 红蓝渐变流动 */
.hero-title{font-weight:700;font-size:clamp(40px,7.6vw,84px);line-height:1.4;letter-spacing:.12em;
  background:linear-gradient(120deg,var(--red),var(--blue),var(--red-soft),var(--blue),var(--red));
  background-size:300% 100%;
  -webkit-background-clip:text;background-clip:text;color:transparent;
  text-shadow:none;filter:drop-shadow(0 6px 34px rgba(61,123,240,.18));
  animation:titleFlow 7s linear infinite}
@keyframes titleFlow{to{background-position:300% 0}}
.hero-sub{margin:30px auto 0;color:var(--muted);font-size:clamp(14px,2vw,17px);line-height:2.35;letter-spacing:.1em;max-width:640px}
.hero-sub b{color:var(--blue-soft);font-weight:700}
.hero-actions{margin-top:44px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-block;padding:12px 34px;border-radius:99px;font-size:14px;letter-spacing:.3em;text-indent:.3em;transition:all .35s var(--ease)}
.btn-solid{background:var(--grad);color:#fff;font-weight:700;position:relative;overflow:hidden;box-shadow:0 12px 30px -12px rgba(61,123,240,.55)}
.btn-solid::after{content:"";position:absolute;top:0;left:-80%;width:50%;height:100%;
  background:linear-gradient(100deg,transparent,rgba(255,255,255,.35),transparent);
  transform:skewX(-20deg);animation:btnShine 3.2s ease-in-out infinite}
@keyframes btnShine{0%,60%{left:-80%}100%{left:130%}}
.btn-solid:hover{transform:translateY(-2px);box-shadow:0 18px 40px -12px rgba(232,72,61,.6)}
.btn-ghost{border:1px solid rgba(198,209,230,.35);color:var(--ink)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue-soft)}
.hero-scroll{position:absolute;bottom:22px;left:50%;transform:translateX(-50%);z-index:2;width:1px;height:52px;
  background:linear-gradient(rgba(198,209,230,.5),transparent)}

/* ---------- 通用 section ---------- */
.sec{padding:clamp(58px,8vh,92px) clamp(22px,5vw,60px)}
.sec-alt{background:linear-gradient(180deg,var(--bg) 0%,var(--bg2) 16%,var(--bg2) 84%,var(--bg) 100%)}
.sec-head{margin-bottom:clamp(40px,6vh,64px)}
.eyebrow{font-size:11.5px;letter-spacing:.5em;color:var(--blue);margin-bottom:16px;display:flex;align-items:center;gap:14px}
.eyebrow::before{content:"";width:34px;height:1px;background:var(--grad);flex:none}
.sec-head h2{font-size:clamp(28px,4.4vw,46px);font-weight:700;letter-spacing:.14em}
.sec-note{margin-top:12px;color:var(--muted);font-size:13px;letter-spacing:.22em}

/* ---------- 板块二 关于 (雷达 + 文字 + 统计) ---------- */
.about-grid{display:grid;grid-template-columns:minmax(240px,340px) 1fr;gap:clamp(28px,5vw,64px);
  align-items:center;max-width:1080px;margin:0 auto}
@media(max-width:780px){.about-grid{grid-template-columns:1fr;justify-items:center;text-align:center}}
/* 雷达扫描 */
.radar{position:relative;width:min(280px,70vw);height:min(280px,70vw);border-radius:50%;
  border:1px solid rgba(61,123,240,.28);
  background:
    radial-gradient(circle at center,rgba(61,123,240,.08),transparent 62%);
  overflow:hidden;flex:none}
.radar::before{content:"";position:absolute;inset:22%;border:1px solid rgba(61,123,240,.2);border-radius:50%}
.radar::after{content:"";position:absolute;inset:42%;border:1px solid rgba(232,72,61,.2);border-radius:50%}
.radar-sweep{position:absolute;inset:0;border-radius:50%;
  background:conic-gradient(from 0deg,rgba(74,144,248,.5),transparent 40%);
  animation:radarSpin 3s linear infinite}
@keyframes radarSpin{to{transform:rotate(360deg)}}
.radar-core{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  font-size:13px;letter-spacing:.3em;text-indent:.3em;color:var(--blue-soft);
  background:rgba(7,11,20,.85);border:1px solid rgba(61,123,240,.4);border-radius:99px;
  padding:6px 16px;font-weight:700;z-index:2}
.radar-dot{position:absolute;top:50%;left:50%;width:6px;height:6px;border-radius:50%;
  background:var(--red);box-shadow:0 0 12px var(--red);transform:translate(-50%,-50%);z-index:2;
  animation:dotPulse 2s ease-in-out infinite}
@keyframes dotPulse{0%,100%{box-shadow:0 0 8px var(--red)}50%{box-shadow:0 0 22px var(--red-soft)}}
.radar-blip{position:absolute;width:5px;height:5px;border-radius:50%;background:var(--blue-soft);opacity:0;z-index:2}
.radar-blip.b1{top:28%;left:62%;animation:blip 3s ease-out infinite}
.radar-blip.b2{top:64%;left:30%;animation:blip 3s ease-out infinite 1.5s}
@keyframes blip{0%{opacity:0;transform:scale(.4)}30%{opacity:.9}100%{opacity:0;transform:scale(2.2)}}
.about-text p{color:var(--muted);font-size:clamp(14px,1.8vw,16.5px);line-height:2.2;letter-spacing:.06em;margin-bottom:16px}
.about-text p:first-child{color:var(--ink);font-size:clamp(16px,2vw,18px)}
.stats{display:flex;gap:clamp(16px,3vw,40px);margin-top:28px;flex-wrap:wrap}
.stat{flex:1;min-width:120px;text-align:center}
.stat-num{display:block;font-size:clamp(30px,4vw,44px);font-weight:700;letter-spacing:.06em;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1.2}
.stat-label{display:block;margin-top:6px;font-size:11.5px;letter-spacing:.14em;color:var(--faint)}
.about-note{margin-top:18px;font-size:11px;letter-spacing:.2em;color:var(--faint)}

/* ---------- 板块三 领航 ---------- */
.leaders{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(16px,2.6vw,30px);max-width:1080px;margin:0 auto}
@media(max-width:860px){.leaders{grid-template-columns:1fr}}
.leader{
  display:flex;gap:clamp(24px,3.4vw,38px);align-items:stretch;
  background:linear-gradient(160deg,var(--card),var(--bg2));
  border:1px solid var(--line);border-radius:22px;padding:clamp(24px,3vw,34px);
  position:relative;overflow:hidden;
  transition:transform .18s var(--ease),border-color .4s,box-shadow .5s var(--ease);
  will-change:transform;
}
.leader::after{content:"";position:absolute;top:0;left:-120%;width:60%;height:100%;
  background:linear-gradient(100deg,transparent,rgba(198,209,230,.05),transparent);
  transition:left 1s var(--ease);pointer-events:none}
.leader:hover{border-color:rgba(61,123,240,.4);
  box-shadow:0 30px 60px -30px rgba(0,0,0,.8),0 0 0 1px rgba(61,123,240,.1)}
.leader:hover::after{left:130%}
.l-photo{flex:none;width:clamp(150px,20vw,210px);border-radius:16px;overflow:hidden;position:relative;
  aspect-ratio:3/3.7;border:1px solid var(--line);box-shadow:0 18px 44px -22px rgba(0,0,0,.7)}
.l-photo-missing{background:repeating-linear-gradient(45deg,rgba(61,123,240,.05) 0 12px,rgba(232,72,61,.06) 12px 24px);
  display:flex;align-items:center;justify-content:center}
.ph-missing{text-align:center;color:var(--faint);letter-spacing:.3em;font-size:13px;line-height:2.4}
.l-body{display:flex;flex-direction:column;justify-content:center;min-width:0}
.l-role{display:inline-block;align-self:flex-start;font-size:11px;letter-spacing:.42em;text-indent:.42em;
  color:var(--blue-soft);border:1px solid rgba(61,123,240,.45);border-radius:99px;padding:3px 14px;margin-bottom:16px}
.l-name{font-size:clamp(24px,3vw,32px);font-weight:700;letter-spacing:.3em;margin-bottom:14px}
.l-quote{color:var(--muted);font-size:clamp(13px,1.7vw,15.5px);line-height:2.1;margin-bottom:0;font-style:normal}
@media(max-width:480px){.leader{flex-direction:column;text-align:center}
  .l-photo{align-self:center;width:140px}.l-role{align-self:center}}

/* ---------- 板块四 部门 ---------- */
.depts{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(14px,1.8vw,22px);max-width:1080px;margin:0 auto}
@media(max-width:720px){.depts{grid-template-columns:1fr}}
.dept{
  background:var(--card);border:1px solid var(--line);border-radius:18px;
  padding:clamp(20px,2.4vw,26px);display:flex;flex-direction:column;gap:14px;
  transition:transform .18s var(--ease),border-color .35s,background .4s;
  will-change:transform;
}
.dept:hover{border-color:rgba(232,72,61,.35);background:var(--card2)}
.dept-top{display:flex;align-items:center;justify-content:space-between;gap:10px}
.dept-top h3{font-size:clamp(19px,2vw,23px);font-weight:700;letter-spacing:.3em}
.tag{font-family:var(--sans);font-size:10px;letter-spacing:.18em;color:var(--blue-soft);
  border:1px solid rgba(61,123,240,.5);border-radius:99px;padding:2px 10px;white-space:nowrap;font-weight:600}
.tag-blue{color:var(--red-soft);border-color:rgba(232,72,61,.5)}
.dept-tags{display:flex;flex-wrap:wrap;gap:6px}
.dept-tags span{font-family:var(--sans);font-size:10.5px;letter-spacing:.08em;color:rgba(198,209,230,.78);
  background:rgba(61,123,240,.1);border:1px solid rgba(61,123,240,.28);border-radius:99px;padding:2px 10px}
.dept-duties{list-style:none;display:grid;gap:6px}
.dept-duties li{position:relative;padding-left:15px;font-size:13px;line-height:1.85;color:var(--muted)}
.dept-duties li::before{content:"·";position:absolute;left:1px;top:0;color:var(--blue);font-weight:700}
.dept-want{color:var(--muted);font-size:12.5px;line-height:1.9;border-left:2px solid rgba(232,72,61,.4);padding-left:10px}
.dept-person{margin-top:auto;display:flex;gap:14px;align-items:center;border-top:1px dashed var(--line);padding-top:16px}
.dept-person .ph{position:relative;flex:none;width:74px;height:100px;border-radius:12px;overflow:hidden;
  border:1px solid var(--line);display:flex;align-items:center;justify-content:center;
  background:#0a101d}
.dept-person .ph img{width:100%;height:100%;object-fit:contain;display:block}
.dept-person .ph span{font-size:10px;letter-spacing:.2em;color:var(--faint)}
.dp-info{min-width:0;font-size:13.5px;line-height:2.1;color:var(--ink)}
.dp-info b{color:var(--blue-soft);font-weight:700;letter-spacing:.1em;margin-right:2px}

/* ---------- 板块五 光影 ---------- */
.lifes{columns:3;column-gap:16px;max-width:1080px;margin:0 auto}
@media(max-width:960px){.lifes{columns:2}}
@media(max-width:560px){.lifes{columns:1}}
.lf{break-inside:avoid;margin-bottom:16px;border-radius:14px;overflow:hidden;
  position:relative;background:#05070b;border:1px solid var(--line);min-height:150px}
.lf.wide{column-span:all}
.lf.ph-missing{height:200px;display:flex;align-items:flex-end;
  background:repeating-linear-gradient(45deg,rgba(61,123,240,.05) 0 16px,rgba(232,72,61,.05) 16px 32px)}
.lf.ph-missing figcaption{width:100%;padding:14px;font-size:12px;letter-spacing:.12em;color:var(--faint);text-align:center}

/* ---------- 板块六 加入 ---------- */
.sec-final{background:
  linear-gradient(180deg,var(--bg) 0%,transparent 9%),
  radial-gradient(720px 380px at 50% -4%,rgba(61,123,240,.14),transparent 66%),
  radial-gradient(560px 340px at 85% 110%,rgba(232,72,61,.12),transparent 60%),
  var(--bg);
  position:relative;overflow:hidden}
.final-inner{max-width:820px;margin:0 auto;text-align:center;display:flex;flex-direction:column;align-items:center}
.final-eyebrow{font-size:11.5px;letter-spacing:.6em;text-indent:.6em;color:var(--blue);margin-bottom:20px}
.final-title{font-size:clamp(30px,5vw,52px);font-weight:700;letter-spacing:.16em;margin-bottom:18px}
.final-lead{color:var(--muted);font-size:clamp(13.5px,1.9vw,16px);line-height:2.3;letter-spacing:.1em;margin-bottom:36px}
.final-group{margin-top:26px;display:flex;flex-direction:column;align-items:center}
.join-qq{
  display:inline-flex;flex-direction:column;align-items:center;gap:2px;
  background:var(--grad);
  border:none;border-radius:18px;cursor:pointer;font-family:inherit;
  padding:16px 52px;min-width:min(330px,84vw);
  box-shadow:0 18px 44px -18px rgba(61,123,240,.5);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),filter .3s;
}
.join-qq:hover{transform:translateY(-3px);filter:brightness(1.07);
  box-shadow:0 26px 56px -18px rgba(232,72,61,.6)}
.join-qq:active{transform:translateY(0)}
.jq-title{font-size:clamp(18px,2.6vw,24px);font-weight:700;letter-spacing:.34em;text-indent:.34em;color:#fff;line-height:1.4}
.jq-sub{font-size:11.5px;letter-spacing:.2em;color:rgba(255,255,255,.78);font-weight:600}
.join-qq{text-decoration:none;color:inherit}
.final-hint{margin-top:24px;font-size:12px;letter-spacing:.3em;text-indent:.3em;color:rgba(198,209,230,.4)}

/* ---------- footer ---------- */
.footer{text-align:center;padding:38px 20px 54px;
  background:linear-gradient(180deg,var(--bg),#0a0f1b 100%);
  color:var(--faint);font-size:12.5px;letter-spacing:.3em;line-height:2.4}
.foot-sub{color:rgba(198,209,230,.3);font-size:11px;letter-spacing:.2em}
.foot-soft{color:rgba(116,164,248,.5);font-size:11.5px;letter-spacing:.4em;margin-top:8px}

/* ---------- 入场动画 ---------- */
.js .reveal{opacity:0;transform:translateY(30px);transition:opacity 1s var(--ease),transform 1s var(--ease)}
.js .reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .js .reveal{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
  .hero-beacon::before,.hero-beacon::after,.hero-title,.btn-solid::after,
  .radar-sweep,.shield path{animation:none}
}

/* 移动端: 去掉点击高亮与焦点蓝框 (保留 :focus-visible) */
*{-webkit-tap-highlight-color:transparent}
a:focus,button:focus{outline:none}
a:focus-visible,button:focus-visible{outline:2px solid var(--blue);outline-offset:2px}