*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
:root{--c:#00d4ff;--bd:rgba(0,150,255,.35)}
body{background:#020612;color:#fff;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;overflow-x:hidden}
a{text-decoration:none;color:inherit}



/* 背景 B：科技网格 + 蓝色光晕 + 连线光点 */
body::before{content:"";position:fixed;inset:0;z-index:-6;background:
radial-gradient(ellipse 80% 40% at 50% 0%,rgba(25,90,210,.55),transparent 70%),
radial-gradient(ellipse 80% 35% at 50% 100%,rgba(10,80,160,.45),transparent 70%),
linear-gradient(rgba(0,160,255,.09) 1px,transparent 1px) 0 0/40px 40px,
linear-gradient(90deg,rgba(0,160,255,.09) 1px,transparent 1px) 0 0/40px 40px,
linear-gradient(#050c20,#020612)}
#particles-js{position:fixed;inset:0;z-index:-5}

/* 导航 */
header{position:fixed;top:0;width:100%;z-index:999;backdrop-filter:blur(16px);background:rgba(2,8,25,.55);border-bottom:1px solid rgba(0,150,255,.2)}
nav{max-width:1200px;margin:auto;padding:14px 32px;display:flex;justify-content:space-between;align-items:center}
nav ul{display:flex;list-style:none;gap:40px}
nav a{color:#c9d6ee;font-size:15px;padding:10px 4px;display:inline-block;border-bottom:2px solid transparent;transition:.3s}
nav a:hover,nav a.active{color:#2eaaff;border-color:#1e8cff}
.nav-btn{background:none;border:1px solid #1e8cff;color:#7cc4ff;padding:9px 24px;border-radius:30px;cursor:pointer;font-size:15px}

/* 首页 */
.hero{min-height:auto;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;padding:92px 20px 24px}
.avatar-box{position:relative;width:170px;height:170px}
.avatar{width:100%;height:100%;border-radius:50%;object-fit:cover;border:4px solid #1e8cff;animation:glow 3s infinite alternate}
@keyframes glow{from{box-shadow:0 0 25px #1e8cff,0 0 50px rgba(30,140,255,.6)}to{box-shadow:0 0 45px #1e8cff,0 0 90px rgba(30,140,255,.8)}}
.avatar-ring{position:absolute;width:224px;height:224px;left:-27px;top:-27px;border-radius:50%;border:2px dashed rgba(0,212,255,.7);animation:ring 10s linear infinite}
@keyframes ring{to{transform:rotate(360deg)}}
.hero h1{margin-top:40px;font-size:46px;letter-spacing:.3em;color:#eaf6ff;text-shadow:0 0 20px #1e8cff}
#typing{margin-top:6px;font-size:20px;font-weight:500;color:#d6e6ff}
.hero p{margin-top:8px;color:#9fb3d6;letter-spacing:.08em}
.hero-btns{margin-top:22px;display:flex;gap:16px;flex-wrap:wrap;justify-content:center}
.hero-btns a,.hero-btns button{min-width:170px;padding:11px 24px;border:1px solid #1e8cff;background:rgba(0,212,255,.08);color:#7cd8ff;border-radius:8px;cursor:pointer;font-size:16px;box-shadow:0 0 18px rgba(30,140,255,.35)}
.hero-btns .btn-fill{background:linear-gradient(180deg,#1b5fe0,#103a9a);color:#fff}

/* 标题 */
.title{text-align:center;font-size:28px;color:#eaf6ff;letter-spacing:.15em}
.title i{color:#2eaaff;font-style:italic;margin:0 12px}
.sub{text-align:center;color:#8aa0c8;margin:4px 0 20px;font-size:13px;letter-spacing:.2em}

/* 项目卡片 */
.projects{padding:36px 5% 12px}
.cards{max-width:1250px;margin:auto;display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.card{position:relative;background:rgba(4,14,38,.65);border:1px solid var(--bd);border-radius:6px;padding:12px 12px 16px;text-align:center;backdrop-filter:blur(12px);transition:.3s}
.card:hover{transform:translateY(-6px);box-shadow:0 0 30px rgba(30,140,255,.45)}
.num{position:absolute;left:14px;top:10px;color:#2eaaff;font-style:italic;font-size:15px}
.ico{width:76px;height:76px;margin:4px auto 6px;display:flex;align-items:center;justify-content:center;font-size:38px;border-radius:50%;background:radial-gradient(circle,rgba(30,140,255,.35),transparent 70%);filter:drop-shadow(0 0 12px #1e8cff)}
.card h3{font-size:17px;margin-bottom:6px}
.card p{color:#9fb3d6;font-size:13px;line-height:1.7;min-height:44px}
.more{display:inline-block;margin-top:10px;padding:4px 20px;border:1px solid var(--bd);border-radius:4px;font-size:13px;color:#cfe3ff}
.more:hover{background:rgba(30,140,255,.25)}

/* 关于我 */
.about{padding:28px 5% 12px}
.about-box{max-width:1250px;margin:16px auto 0;display:grid;grid-template-columns:1.1fr 1fr;gap:0;background:rgba(4,14,38,.6);border:1px solid var(--bd);border-radius:6px}
.about-box>div{padding:18px 24px}
.about-box>div+div{border-left:1px solid var(--bd)}
.about-box h3{font-size:17px;margin-bottom:10px}
.about-box p{color:#b7c6e2;font-size:14px;line-height:1.85}
.about-box p+p{margin-top:8px}
.tools{display:grid;grid-template-columns:repeat(4,1fr);gap:10px 6px;text-align:center}
.tools span{font-size:12px;color:#cfe0ff;display:flex;flex-direction:column;align-items:center;gap:6px}
.tools b{width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:14px}

/* 联系我 */
.contact{max-width:1250px;margin:8px auto 0;padding:20px 20px 72px;text-align:center}
.contact h2{font-size:22px;letter-spacing:.2em}
.contact p{color:#9fb3d6;margin-top:6px;font-size:14px}
.wechat-box{display:inline-block;margin-top:12px;padding:10px 40px;border:1px solid #1e8cff;border-radius:8px;background:rgba(30,140,255,.08);box-shadow:0 0 28px rgba(30,140,255,.4);font-size:22px}

/* 手机适配 */
@media(max-width:1000px){.cards{grid-template-columns:repeat(2,1fr)}.about-box{grid-template-columns:1fr}.about-box>div+div{border-left:0;border-top:1px solid var(--bd)}}
@media(max-width:600px){
nav{padding:10px 14px}nav ul{gap:12px}nav a{font-size:13px}.nav-btn{padding:7px 12px;font-size:13px}
.hero{padding-top:80px}.hero h1{font-size:36px;margin-top:34px}#typing{font-size:17px}.avatar-box{width:140px;height:140px}.avatar-ring{width:188px;height:188px;left:-24px;top:-24px}.hero-btns a,.hero-btns button{min-width:140px;padding:10px 18px;font-size:15px}.cards{gap:10px}
.cards{grid-template-columns:repeat(2,1fr)}.card h3{font-size:14px}.card p{font-size:11.5px;min-height:0}.ico{width:60px;height:60px;font-size:30px}.more{padding:3px 14px;font-size:12px}.tools{gap:10px 4px}.tools span{font-size:10.5px}.tools b{width:34px;height:34px;font-size:12px}.wechat-box{padding:10px 20px;font-size:18px}.title{font-size:24px}}

/* 项目详情弹窗 */
.card{cursor:pointer}
.modal{position:fixed;inset:0;z-index:2000;display:flex;align-items:center;justify-content:center;padding:20px;background:rgba(1,5,16,.78);backdrop-filter:blur(6px);opacity:0;pointer-events:none;transition:opacity .25s}
.modal.open{opacity:1;pointer-events:auto}
.modal-box{position:relative;width:100%;max-width:560px;max-height:86vh;overflow-y:auto;background:#06122e;border:1px solid #1e8cff;border-radius:10px;padding:28px 26px 26px;box-shadow:0 0 40px rgba(30,140,255,.45);transform:translateY(14px);transition:transform .25s}
.modal.open .modal-box{transform:none}
.modal-x{position:absolute;right:12px;top:8px;background:none;border:0;color:#9fb3d6;font-size:30px;cursor:pointer;line-height:1}
.m-ico{font-size:44px;text-align:center}
.modal-box h3{text-align:center;font-size:22px;margin:6px 0 14px}
.modal-box h4{color:#2eaaff;font-size:15px;margin:18px 0 8px}
.m-intro,.modal-box p,.modal-box li{color:#c4d2ee;font-size:14px;line-height:1.9}
.modal-box ul{padding-left:20px}
.m-flow{display:flex;gap:8px;list-style:none;padding:0;flex-wrap:wrap}
.m-flow li{flex:1;min-width:100px;text-align:center;border:1px solid var(--bd);border-radius:6px;padding:8px 4px;font-size:13px}
.m-note{margin-top:16px;font-size:12px!important;color:#8aa0c8!important;border-top:1px dashed var(--bd);padding-top:12px}
.m-cta{display:block;width:100%;margin-top:18px;padding:13px;border:1px solid #1e8cff;border-radius:8px;background:linear-gradient(180deg,#1b5fe0,#103a9a);color:#fff;font-size:16px;cursor:pointer}
#music-btn{position:fixed;right:18px;bottom:18px;z-index:1500;width:46px;height:46px;border-radius:50%;border:1px solid #1e8cff;background:rgba(4,14,38,.8);font-size:20px;cursor:pointer;box-shadow:0 0 16px rgba(30,140,255,.5);backdrop-filter:blur(8px)}
#music-btn.on{animation:spin 4s linear infinite}
#music-btn.off{opacity:.55}
@keyframes spin{to{transform:rotate(360deg)}}

/* 卡片点击发光 / 工具可点击 */
.card{overflow:hidden}
.card.flash{animation:cflash .7s ease-out}
@keyframes cflash{0%{box-shadow:0 0 0 rgba(0,212,255,0)}30%{box-shadow:0 0 46px 6px rgba(0,212,255,.85),inset 0 0 30px rgba(0,212,255,.35);border-color:#7ee6ff}100%{box-shadow:0 0 0 rgba(0,212,255,0)}}
.ripple{position:absolute;width:260px;height:260px;border-radius:50%;pointer-events:none;background:radial-gradient(circle,rgba(0,212,255,.6),transparent 68%);transform:translate(-50%,-50%) scale(0);animation:rip .75s ease-out forwards}
@keyframes rip{to{transform:translate(-50%,-50%) scale(1.6);opacity:0}}
.tool{cursor:pointer;border-radius:10px;padding:4px 0;transition:.25s}
.tool:hover,.tool:focus-visible{background:rgba(30,140,255,.14);outline:0}
.tool:active b{box-shadow:0 0 18px #2eaaff}
#t-ico b{display:flex;margin:0 auto;width:56px;height:56px;border-radius:14px;align-items:center;justify-content:center;font-size:18px;box-shadow:0 0 22px rgba(46,170,255,.5)}