/* =========================================================
   小学生技术交流实验室 · Technology Research Laboratory
   拟态（Neumorphism）视觉系统
   ========================================================= */

:root{
    /* 拟态基底色 —— 柔和低饱和灰调 */
    --bg-0:#e0e5ec;
    --bg-1:#d9dee6;
    --bg-2:#cfd4dc;
    --bg-3:#c5cad3;

    /* 暗部与亮部 */
    --light:#ffffff;
    --dark:#a3b1c6;
    --light-soft:rgba(255,255,255,0.8);
    --dark-soft:rgba(163,177,198,0.4);

    /* 主色：低饱和暖灰蓝 */
    --primary:#6b7a99;
    --primary-soft:#8896b0;
    --primary-deep:#4a5a78;

    /* 点缀色：柔和暖棕 */
    --accent:#a08974;
    --accent-soft:#c0ab94;
    --accent-deep:#7c6a58;

    /* 文字 —— 低对比度，柔和自然 */
    --text:#3a4356;
    --text-2:#5a6478;
    --text-3:#7a8499;
    --text-4:#9aa3b5;

    /* 拟态凸起阴影 */
    --neo-out:
        8px 8px 16px var(--dark-soft),
        -8px -8px 16px var(--light-soft);
    --neo-out-sm:
        5px 5px 10px var(--dark-soft),
        -5px -5px 10px var(--light-soft);
    --neo-out-xs:
        3px 3px 6px var(--dark-soft),
        -3px -3px 6px var(--light-soft);

    /* 拟态凹陷阴影 */
    --neo-in:
        inset 6px 6px 12px var(--dark-soft),
        inset -6px -6px 12px var(--light-soft);
    --neo-in-sm:
        inset 4px 4px 8px var(--dark-soft),
        inset -4px -4px 8px var(--light-soft);

    /* 按压态 */
    --neo-pressed:
        inset 4px 4px 8px var(--dark-soft),
        inset -4px -4px 8px var(--light-soft);

    /* 字体 */
    --font-display:'Noto Serif SC','Inter',serif;
    --font-cn:'Noto Serif SC','Inter',sans-serif;
    --font-body:'Inter','Noto Serif SC',sans-serif;
    --font-mono:'JetBrains Mono',monospace;

    --container:1200px;
    --radius-lg:24px;
    --radius-md:16px;
    --radius-sm:12px;
}

*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent;}
html{scroll-behavior:smooth;}
body{
    font-family:var(--font-body);
    background:var(--bg-0);
    color:var(--text);
    overflow-x:hidden;
    line-height:1.7;
    -webkit-font-smoothing:antialiased;
    position:relative;
}

/* 拟态背景细腻纹理（噪点 + 径向渐变柔和过渡） */
body::before{
    content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
    background:
        radial-gradient(ellipse at 20% 20%,rgba(255,255,255,0.3),transparent 50%),
        radial-gradient(ellipse at 80% 80%,rgba(163,177,198,0.2),transparent 50%),
        linear-gradient(135deg,#e4e8ef 0%,#dde2eb 50%,#e6eaf2 100%);
}
body::after{
    content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
    opacity:0.025;
    background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* 滚动条 */
::-webkit-scrollbar{width:10px;height:10px;}
::-webkit-scrollbar-track{background:var(--bg-0);}
::-webkit-scrollbar-thumb{
    background:var(--bg-0);
    border-radius:10px;
    box-shadow:var(--neo-out-xs);
}
::-webkit-scrollbar-thumb:hover{background:var(--bg-1);}
::selection{background:var(--primary);color:#fff;}

a{color:inherit;text-decoration:none;}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;}
ul{list-style:none;}
img{max-width:100%;display:block;}

.container{max-width:var(--container);margin:0 auto;padding:0 24px;position:relative;}

/* 画布层级 */
.matrix-bg,.mouse-particles{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:1;opacity:0.15;}
.mouse-particles{z-index:60;opacity:0.4;}

/* =========================================================
   页面加载动画
   ========================================================= */
.loader{
    position:fixed;inset:0;z-index:200;background:var(--bg-0);
    display:flex;flex-direction:column;align-items:center;justify-content:center;gap:40px;
    transition:opacity 0.8s ease,visibility 0.8s ease;
}
.loader.hidden{opacity:0;visibility:hidden;}
.loader-core{position:relative;width:120px;height:120px;border-radius:50%;
    box-shadow:var(--neo-out);
    display:flex;align-items:center;justify-content:center;
    background:var(--bg-0);
}
.loader-ring{
    position:absolute;inset:8px;border-radius:50%;
    border:2px solid transparent;
    border-top-color:var(--primary);
    border-right-color:var(--primary-soft);
    animation:spin 1.2s linear infinite;
}
.loader-ring-2{inset:18px;border-top-color:var(--accent);border-right-color:var(--accent-soft);
    animation-duration:1.8s;animation-direction:reverse;}
.loader-logo{font-size:36px;color:var(--primary);animation:pulse 1.5s ease-in-out infinite;}
@keyframes spin{to{transform:rotate(360deg);}}
@keyframes pulse{0%,100%{transform:scale(1);opacity:1;}50%{transform:scale(1.08);opacity:0.7;}}
.loader-text{display:flex;flex-direction:column;align-items:center;gap:10px;}
.loader-title{font-family:var(--font-cn);font-weight:600;font-size:18px;letter-spacing:2px;color:var(--text);}
.loader-sub{font-family:var(--font-mono);font-size:10px;letter-spacing:3px;color:var(--text-3);text-transform:uppercase;}
.loader-bar{
    width:220px;height:8px;border-radius:100px;
    box-shadow:var(--neo-in-sm);
    overflow:hidden;background:var(--bg-0);
}
.loader-bar i{
    display:block;height:100%;width:0%;
    background:linear-gradient(90deg,var(--primary-soft),var(--primary));
    border-radius:100px;
    transition:width 0.2s linear;
}

/* =========================================================
   导航
   ========================================================= */
.nav{
    position:fixed;top:0;left:0;right:0;z-index:100;
    padding:16px 0;
    transition:all 0.4s ease;
}
.nav.scrolled{
    padding:10px 0;
}
.nav-inner{
    max-width:var(--container);margin:0 auto;padding:0 24px;
    display:flex;align-items:center;justify-content:space-between;gap:24px;
    position:relative;
}
.nav.scrolled .nav-inner{
    margin:12px auto 0;
    padding:8px 20px;
    border-radius:100px;
    background:var(--bg-0);
    box-shadow:var(--neo-out-sm);
    max-width:calc(var(--container) - 40px);
}

.nav-logo{display:flex;align-items:center;gap:12px;flex-shrink:0;}
.nav-logo-icon{
    width:44px;height:44px;border-radius:14px;
    display:flex;align-items:center;justify-content:center;font-size:20px;
    background:var(--bg-0);
    box-shadow:var(--neo-out-sm);
    color:var(--primary);
    transition:all 0.3s ease;
}
.nav.scrolled .nav-logo-icon{width:38px;height:38px;font-size:18px;border-radius:12px;}
.nav-logo:hover .nav-logo-icon{box-shadow:var(--neo-in-sm);}
.nav-logo-text{display:flex;flex-direction:column;line-height:1.2;}
.nav-logo-text b{font-family:var(--font-cn);font-weight:600;font-size:15px;color:var(--text);letter-spacing:0.5px;}
.nav-logo-text i{font-family:var(--font-mono);font-style:normal;font-size:9px;letter-spacing:2px;color:var(--text-3);text-transform:uppercase;}
.nav-links{display:flex;gap:4px;align-items:center;}
.nav-links a{
    position:relative;padding:8px 14px;border-radius:10px;
    font-size:13px;font-weight:500;color:var(--text-2);
    display:flex;flex-direction:column;align-items:center;line-height:1.2;
    transition:all 0.3s ease;
}
.nav-links a span{font-family:var(--font-mono);font-size:8px;letter-spacing:1.5px;color:var(--text-4);text-transform:uppercase;margin-top:2px;}
.nav-links a:hover{
    color:var(--text);
    box-shadow:var(--neo-out-xs);
}
.nav-links a.active{
    color:var(--primary-deep);
    box-shadow:var(--neo-in-sm);
}

.nav-toggle{display:none;flex-direction:column;gap:5px;padding:10px;border-radius:10px;
    background:var(--bg-0);box-shadow:var(--neo-out-xs);
    width:42px;height:42px;align-items:center;justify-content:center;
}
.nav-toggle span{width:18px;height:2px;background:var(--text-2);border-radius:2px;transition:0.3s;}
.nav-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle.active span:nth-child(2){opacity:0;}
.nav-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* =========================================================
   HERO
   ========================================================= */
.hero{
    position:relative;min-height:100vh;
    display:flex;align-items:center;justify-content:center;
    padding:120px 24px 80px;
    z-index:2;
    overflow:hidden;
}
.hero-decor{
    position:absolute;top:50%;left:50%;
    transform:translate(-50%,-50%);
    width:min(600px,80vw);height:min(600px,80vw);
    pointer-events:none;
    z-index:1;
}
.hero-ring{
    position:absolute;inset:0;border-radius:50%;
    border:1px solid rgba(163,177,198,0.3);
    box-shadow:
        inset 10px 10px 30px rgba(163,177,198,0.2),
        inset -10px -10px 30px rgba(255,255,255,0.6);
}
.hero-ring-1{
    inset:0;
    animation:ringFloat 8s ease-in-out infinite;
}
.hero-ring-2{
    inset:15%;
    animation:ringFloat 8s ease-in-out infinite;
    animation-delay:-2s;
}
.hero-ring-3{
    inset:30%;
    animation:ringFloat 8s ease-in-out infinite;
    animation-delay:-4s;
}
@keyframes ringFloat{
    0%,100%{transform:scale(1);opacity:0.7;}
    50%{transform:scale(1.04);opacity:1;}
}

/* HERO 内容 */
.hero-content{position:relative;z-index:5;text-align:center;max-width:900px;}
.hero-badge{
    display:inline-flex;align-items:center;gap:10px;
    padding:10px 22px;border-radius:100px;
    background:var(--bg-0);
    box-shadow:var(--neo-out-sm);
    font-family:var(--font-mono);font-size:11px;letter-spacing:2px;color:var(--text-2);
    text-transform:uppercase;margin-bottom:36px;
}
.hero-badge-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);}

.hero-title{font-family:var(--font-cn);font-weight:700;line-height:1.15;margin-bottom:28px;}
.hero-title-cn{
    display:block;font-size:clamp(36px,7vw,80px);
    color:var(--text);
    letter-spacing:6px;
    font-weight:700;
}
.hero-title-cn:nth-child(2){
    color:var(--primary-deep);
    letter-spacing:6px;
}
.hero-title-en{
    display:block;margin-top:16px;
    font-family:var(--font-mono);font-weight:400;
    font-size:clamp(11px,1.5vw,14px);letter-spacing:6px;
    color:var(--text-3);text-transform:uppercase;
}
.hero-desc{
    font-size:clamp(15px,1.8vw,17px);color:var(--text-2);
    margin-bottom:40px;line-height:1.9;
    max-width:600px;margin-left:auto;margin-right:auto;
}
.hero-actions{display:flex;gap:20px;justify-content:center;flex-wrap:wrap;margin-bottom:56px;}

/* 按钮 —— 拟态 */
.btn{
    position:relative;display:inline-flex;align-items:center;justify-content:center;gap:8px;
    padding:15px 34px;border-radius:var(--radius-md);
    font-weight:600;font-size:14px;letter-spacing:0.5px;
    background:var(--bg-0);
    color:var(--text);
    transition:all 0.3s cubic-bezier(0.22,1,0.36,1);
    box-shadow:var(--neo-out-sm);
    cursor:pointer;user-select:none;
}
.btn-sm{padding:10px 22px;font-size:12px;border-radius:var(--radius-sm);}
.btn:hover{
    box-shadow:var(--neo-out);
    transform:translateY(-2px);
}
.btn:active{
    box-shadow:var(--neo-pressed);
    transform:translateY(1px);
    color:var(--primary-deep);
}
.btn-primary{
    color:var(--primary-deep);
}
.btn-primary:hover{
    color:var(--primary);
}

/* HERO stats —— 拟态凹陷 */
.hero-stats{
    display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
    padding:24px;border-radius:var(--radius-lg);
    background:var(--bg-0);
    box-shadow:var(--neo-in);
}
.hero-stat{display:flex;flex-direction:column;align-items:center;gap:6px;padding:12px 8px;}
.hero-stat-num{
    font-family:var(--font-display);font-weight:700;
    font-size:clamp(22px,3.2vw,34px);
    color:var(--primary-deep);
    display:flex;align-items:baseline;
}
.hero-stat-num i{font-size:0.5em;color:var(--primary-soft);margin-left:2px;font-style:normal;}
.hero-stat-label{font-size:10px;letter-spacing:1.5px;color:var(--text-3);text-transform:uppercase;text-align:center;}

.hero-scroll{
    position:absolute;bottom:24px;left:50%;transform:translateX(-50%);
    display:flex;flex-direction:column;align-items:center;gap:8px;z-index:5;
    font-family:var(--font-mono);font-size:10px;letter-spacing:3px;color:var(--text-4);
}
.hero-scroll i{width:1px;height:40px;background:linear-gradient(180deg,var(--text-3),transparent);animation:scrollDown 1.8s ease-in-out infinite;}
@keyframes scrollDown{0%{transform:scaleY(0);transform-origin:top;}50%{transform:scaleY(1);transform-origin:top;}100%{transform:scaleY(0);transform-origin:bottom;}}

/* =========================================================
   SECTION 通用
   ========================================================= */
.section{
    position:relative;z-index:2;
    padding:120px 24px;
}
.section-alt{
    background:transparent;
}
.section-head{max-width:var(--container);margin:0 auto 64px;text-align:center;position:relative;}
.section-tag{
    display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:3px;
    color:var(--primary);text-transform:uppercase;
    padding:8px 20px;border-radius:100px;
    background:var(--bg-0);
    box-shadow:var(--neo-out-sm);
    margin-bottom:28px;
}
.section-title{
    font-family:var(--font-cn);font-weight:700;
    font-size:clamp(26px,4vw,44px);line-height:1.25;
    margin-bottom:14px;letter-spacing:2px;
    color:var(--text);
}
.section-title em{
    font-style:normal;
    color:var(--primary-deep);
    font-weight:700;
}
.section-sub{font-family:var(--font-mono);font-size:12px;letter-spacing:4px;color:var(--text-4);text-transform:uppercase;}

/* 拟态凸起卡片 */
.neo-card{
    background:var(--bg-0);
    border-radius:var(--radius-lg);
    box-shadow:var(--neo-out);
    position:relative;overflow:hidden;
}

/* 拟态凹陷面板 */
.neo-inset{
    background:var(--bg-0);
    border-radius:var(--radius-lg);
    box-shadow:var(--neo-in);
}

/* 滚动进入动画 */
.reveal{opacity:0;transform:translateY(30px);transition:opacity 0.9s cubic-bezier(0.16,1,0.3,1),transform 0.9s cubic-bezier(0.16,1,0.3,1);}
.reveal.visible{opacity:1;transform:translateY(0);}

/* =========================================================
   ABOUT 区
   ========================================================= */
.about-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:48px;}
.about-card{
    padding:40px 32px;
    background:var(--bg-0);
    border-radius:var(--radius-lg);
    box-shadow:var(--neo-out-sm);
    transition:all 0.4s ease;
    position:relative;
}
.about-card:hover{
    box-shadow:var(--neo-out);
    transform:translateY(-4px);
}
.about-card-num{
    font-family:var(--font-mono);font-weight:700;font-size:42px;
    color:var(--primary-soft);
    line-height:1;margin-bottom:18px;
    letter-spacing:-1px;
}
.about-card h3{font-family:var(--font-cn);font-size:20px;font-weight:600;margin-bottom:12px;color:var(--text);}
.about-card p{color:var(--text-2);font-size:14px;line-height:1.8;}

.about-tech{
    padding:36px;border-radius:var(--radius-lg);
    background:var(--bg-0);
    box-shadow:var(--neo-in);
    display:flex;flex-direction:column;gap:28px;
}
.about-tech-block{display:flex;flex-direction:column;gap:12px;}
.about-tech-label{font-family:var(--font-mono);font-size:11px;letter-spacing:3px;color:var(--text-3);text-transform:uppercase;}
.about-tech-tags{display:flex;flex-wrap:wrap;gap:10px;}
.about-tech-tags span{
    padding:8px 16px;border-radius:10px;font-size:13px;color:var(--text-2);
    background:var(--bg-0);
    box-shadow:var(--neo-out-xs);
    transition:all 0.25s ease;cursor:default;
}
.about-tech-tags span:hover{
    box-shadow:var(--neo-in-sm);
    color:var(--primary-deep);
}

/* =========================================================
   TECH 区
   ========================================================= */
.tech-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.tech-card{
    padding:32px 26px;
    background:var(--bg-0);
    border-radius:var(--radius-md);
    box-shadow:var(--neo-out-sm);
    transition:all 0.4s ease;
    position:relative;
}
.tech-card:hover{
    transform:translateY(-4px);
    box-shadow:var(--neo-out);
}
.tech-icon{
    width:48px;height:48px;border-radius:14px;
    display:flex;align-items:center;justify-content:center;
    font-size:22px;color:var(--primary);
    background:var(--bg-0);
    box-shadow:var(--neo-out-xs);
    margin-bottom:18px;
}
.tech-card h3{font-family:var(--font-cn);font-size:17px;font-weight:600;margin-bottom:8px;color:var(--text);}
.tech-card p{color:var(--text-3);font-size:13px;line-height:1.7;}
.tech-card-id{position:absolute;top:20px;right:24px;font-family:var(--font-mono);font-size:10px;color:var(--text-4);letter-spacing:1px;}

/* =========================================================
   CHALLENGE 区
   ========================================================= */
.challenge-intro{text-align:center;margin-bottom:48px;}
.challenge-quote{
    font-family:var(--font-cn);font-size:clamp(18px,2.5vw,26px);
    font-weight:600;line-height:1.6;color:var(--text);
    max-width:700px;margin:0 auto;
}
.challenge-quote-sub{margin-top:16px;color:var(--primary);font-style:italic;font-size:clamp(14px,1.6vw,16px);}

.challenge-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;}
.challenge-card{
    padding:32px 26px;
    background:var(--bg-0);
    border-radius:var(--radius-md);
    box-shadow:var(--neo-out-sm);
    transition:all 0.4s ease;
    position:relative;
}
.challenge-card:hover{
    transform:translateY(-4px);
    box-shadow:var(--neo-out);
}
.challenge-card-icon{
    width:44px;height:44px;border-radius:12px;
    display:flex;align-items:center;justify-content:center;
    font-family:var(--font-mono);font-weight:700;font-size:14px;color:var(--primary-deep);
    background:var(--bg-0);
    box-shadow:var(--neo-in-sm);
    margin-bottom:18px;
}
.challenge-card h3{font-family:var(--font-cn);font-size:17px;font-weight:600;margin-bottom:10px;color:var(--text);}
.challenge-card p{color:var(--text-3);font-size:13px;line-height:1.7;}
.challenge-card-cta{
    box-shadow:var(--neo-in);
}
.challenge-card-cta h3{color:var(--primary-deep);}
.challenge-card-cta p{color:var(--text-2);margin-bottom:18px;}

/* =========================================================
   PHILOSOPHY 区
   ========================================================= */
.philosophy-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:48px;}
.philosophy-col{
    padding:36px 28px;border-radius:var(--radius-lg);
    background:var(--bg-0);
    box-shadow:var(--neo-out-sm);
    transition:all 0.4s ease;
}
.philosophy-col:hover{
    box-shadow:var(--neo-out);
    transform:translateY(-4px);
}
.philosophy-col-title{
    font-family:var(--font-mono);font-size:11px;letter-spacing:2px;
    color:var(--primary);text-transform:uppercase;margin-bottom:24px;
    padding-bottom:14px;
    border-bottom:1px solid rgba(107,122,153,0.12);
}
.philosophy-list li{
    padding:10px 0;font-size:15px;color:var(--text-2);line-height:1.6;
    position:relative;padding-left:28px;
}
.philosophy-list li::before{
    content:"";position:absolute;left:0;top:17px;width:7px;height:7px;
    background:var(--primary-soft);
    border-radius:50%;
}
.philosophy-list li b{color:var(--primary-deep);font-weight:600;}

.philosophy-banner{
    padding:48px;text-align:center;position:relative;
    background:var(--bg-0);
    border-radius:var(--radius-lg);
    box-shadow:var(--neo-in);
}
.philosophy-banner-num{
    position:absolute;top:24px;right:36px;
    font-family:var(--font-display);font-size:72px;font-weight:700;
    color:var(--primary-soft);opacity:0.25;line-height:1;
}
.philosophy-banner p{font-family:var(--font-cn);font-size:clamp(18px,2.2vw,24px);font-weight:600;color:var(--text);margin-bottom:10px;}
.philosophy-banner span{font-family:var(--font-mono);font-size:11px;letter-spacing:3px;color:var(--text-4);text-transform:uppercase;}

/* =========================================================
   TEAM 区 3D 卡片（拟态软化）
   ========================================================= */
.team-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.team-card{
    cursor:pointer;
    perspective:1200px;
}
.team-card-inner{
    position:relative;padding:36px 28px;border-radius:var(--radius-lg);
    background:var(--bg-0);
    box-shadow:var(--neo-out-sm);
    transform-style:preserve-3d;
    transition:transform 0.2s ease, box-shadow 0.4s ease;
    overflow:hidden;
}
.team-card:hover .team-card-inner{
    box-shadow:var(--neo-out);
}
.team-avatar{
    position:relative;width:92px;height:92px;border-radius:50%;
    margin:0 auto 20px;
    display:flex;align-items:center;justify-content:center;
    font-family:var(--font-display);font-weight:700;font-size:28px;
    color:#fff;
    background:linear-gradient(135deg,var(--c1,var(--primary-soft)),var(--c2,var(--accent-soft)));
    box-shadow:var(--neo-out-sm);
    transform:translateZ(40px);
}
.team-avatar-ring{
    position:absolute;inset:-8px;border-radius:50%;
    border:1px dashed var(--primary-soft);opacity:0.5;
    animation:spin 14s linear infinite;
}
.team-card h3{
    font-family:var(--font-cn);font-size:19px;font-weight:600;text-align:center;
    margin-bottom:6px;color:var(--text);
    transform:translateZ(30px);
}
.team-role{
    display:block;text-align:center;font-family:var(--font-mono);
    font-size:10px;letter-spacing:1.5px;color:var(--primary);
    text-transform:uppercase;margin-bottom:14px;
    transform:translateZ(20px);
}
.team-bio{text-align:center;color:var(--text-2);font-size:13px;line-height:1.8;margin-bottom:18px;transform:translateZ(15px);}
.team-skills{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;transform:translateZ(18px);}
.team-skills span{
    padding:4px 10px;border-radius:8px;font-size:11px;font-family:var(--font-mono);
    color:var(--text-3);background:var(--bg-0);
    box-shadow:var(--neo-out-xs);
}

/* =========================================================
   PROJECTS 区 GitHub
   ========================================================= */
.projects-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:48px;}
.project-card{
    padding:28px;border-radius:var(--radius-md);
    background:var(--bg-0);
    box-shadow:var(--neo-out-sm);
    transition:all 0.4s ease;
    position:relative;display:flex;flex-direction:column;
}
.project-card:hover{
    transform:translateY(-4px);
    box-shadow:var(--neo-out);
}
.project-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;}
.project-name{display:flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:15px;font-weight:600;color:var(--text);}
.project-name .project-book{color:var(--primary);}
.project-lang{display:inline-flex;align-items:center;gap:6px;font-family:var(--font-mono);font-size:11px;color:var(--text-3);}
.project-lang i{width:10px;height:10px;border-radius:50%;background:var(--primary-soft);}
.project-desc{color:var(--text-2);font-size:13px;line-height:1.7;flex:1;margin-bottom:16px;}
.project-meta{display:flex;gap:14px;font-family:var(--font-mono);font-size:12px;color:var(--text-3);}
.project-meta span{display:inline-flex;align-items:center;gap:5px;}
.projects-cta{text-align:center;}

/* =========================================================
   COOPERATION 区
   ========================================================= */
.coop-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:48px;}
.coop-col{
    padding:36px 28px;border-radius:var(--radius-lg);
    background:var(--bg-0);
    box-shadow:var(--neo-out-sm);
    transition:all 0.4s ease;
}
.coop-col:hover{
    transform:translateY(-4px);
    box-shadow:var(--neo-out);
}
.coop-col-title{font-family:var(--font-cn);font-size:17px;font-weight:600;margin-bottom:24px;color:var(--text);padding-bottom:14px;border-bottom:1px solid rgba(107,122,153,0.12);}
.coop-list li{padding:10px 0;font-size:15px;color:var(--text-2);position:relative;padding-left:30px;line-height:1.6;}
.coop-list-yes li::before{content:"";position:absolute;left:0;top:14px;width:16px;height:16px;border-radius:50%;
    background:var(--bg-0);box-shadow:var(--neo-out-xs);
    display:flex;align-items:center;justify-content:center;
}
.coop-list-yes li::after{content:"✓";position:absolute;left:5px;top:12px;font-size:10px;color:var(--primary-deep);font-weight:700;}
.coop-list-no li::before{content:"";position:absolute;left:0;top:14px;width:16px;height:16px;border-radius:50%;
    background:var(--bg-0);box-shadow:var(--neo-out-xs);
    display:flex;align-items:center;justify-content:center;
}
.coop-list-no li::after{content:"✕";position:absolute;left:5px;top:11px;font-size:10px;color:var(--text-4);}
.coop-list-no li{color:var(--text-3);}

.coop-partner{
    padding:48px;border-radius:var(--radius-lg);text-align:center;
    background:var(--bg-0);
    box-shadow:var(--neo-in);
    margin-bottom:24px;
}
.coop-partner-title{font-family:var(--font-cn);font-size:clamp(18px,2.2vw,24px);font-weight:700;margin-bottom:24px;color:var(--primary-deep);}
.coop-partner-tags{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:28px;}
.coop-partner-tags span{
    padding:8px 18px;border-radius:100px;
    font-size:13px;color:var(--text-2);
    background:var(--bg-0);
    box-shadow:var(--neo-out-xs);
}
.coop-partner-quote{font-family:var(--font-cn);font-size:clamp(14px,1.6vw,16px);color:var(--text);line-height:1.9;}
.coop-partner-quote b{color:var(--primary-deep);}

.coop-banner{
    padding:36px;text-align:center;border-radius:var(--radius-md);
    background:var(--bg-0);
    box-shadow:var(--neo-in-sm);
}
.coop-banner p{font-family:var(--font-cn);font-size:clamp(14px,1.6vw,16px);color:var(--text-2);line-height:1.9;}

/* =========================================================
   VISION 区
   ========================================================= */
.section-vision{padding-top:120px;}
.vision-card{
    padding:80px 48px;text-align:center;position:relative;
    background:var(--bg-0);
    border-radius:var(--radius-lg);
    box-shadow:var(--neo-in);
}
.vision-line{
    font-family:var(--font-cn);font-size:clamp(16px,2.2vw,22px);
    color:var(--text-2);margin-bottom:14px;line-height:1.6;
}
.vision-line-strong{
    font-size:clamp(20px,2.8vw,30px);font-weight:700;
    color:var(--primary-deep);
    margin-top:20px;margin-bottom:20px;
}
.vision-line-sub{color:var(--accent-deep);font-style:italic;font-size:clamp(14px,1.6vw,17px);}

/* =========================================================
   FOOTER
   ========================================================= */
.footer{
    position:relative;z-index:2;
    padding:72px 24px 32px;
    border-top:1px solid rgba(107,122,153,0.08);
    overflow:hidden;
}
.footer-inner{display:grid;grid-template-columns:1.5fr 2fr;gap:48px;margin-bottom:48px;}
.footer-brand{display:flex;flex-direction:column;gap:20px;}
.footer-tagline{color:var(--text-3);font-size:14px;line-height:1.8;}
.footer-cols{display:grid;grid-template-columns:repeat(3,1fr);gap:32px;}
.footer-col h4{font-family:var(--font-mono);font-size:11px;letter-spacing:2px;color:var(--primary);text-transform:uppercase;margin-bottom:18px;}
.footer-col a{display:block;color:var(--text-2);font-size:14px;padding:6px 0;transition:color 0.25s;}
.footer-col a:hover{color:var(--primary-deep);padding-left:6px;}
.footer-bottom{
    max-width:var(--container);margin:0 auto;padding-top:24px;
    border-top:1px solid rgba(107,122,153,0.08);
    display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;
    font-size:12px;color:var(--text-4);font-family:var(--font-mono);letter-spacing:1px;
}
.footer-status{display:flex;align-items:center;gap:8px;color:var(--accent);}
.footer-status .hud-dot{animation:none;}

/* =========================================================
   响应式
   ========================================================= */
@media(max-width:1100px){
    .nav-links{display:none;}
    .nav-toggle{display:flex;}
    .nav-links.open{
        display:flex;flex-direction:column;
        position:absolute;top:100%;left:24px;right:24px;
        background:var(--bg-0);
        padding:20px;border-radius:var(--radius-md);
        box-shadow:var(--neo-out);
        gap:8px;
        margin-top:10px;
    }
    .nav-links.open a{padding:14px 16px;width:100%;flex-direction:row;justify-content:space-between;}
    .nav-links.open a span{font-size:9px;}
    .hud-tl,.hud-tr{top:90px;}
    .hud-bl,.hud-br{bottom:40px;}
    .hud{min-width:140px;padding:12px 16px;}
    .hud-value{font-size:12px;}
    .about-grid,.tech-grid,.challenge-grid,.philosophy-grid,.coop-grid{grid-template-columns:repeat(2,1fr);}
    .team-grid,.projects-grid{grid-template-columns:repeat(2,1fr);}
    .hero-stats{grid-template-columns:repeat(2,1fr);gap:14px;padding:20px;}
    .footer-inner{grid-template-columns:1fr;}
}
@media(max-width:680px){
    .section{padding:72px 16px;}
    .hero{padding:90px 16px 50px;}
    .hero-earth{width:90vw;height:90vw;opacity:0.5;}
    .hud{display:none;}
    .about-grid,.tech-grid,.challenge-grid,.philosophy-grid,.coop-grid,.team-grid,.projects-grid{grid-template-columns:1fr;}
    .footer-cols{grid-template-columns:repeat(2,1fr);}
    .hero-actions{flex-direction:column;width:100%;}
    .btn{width:100%;}
    .vision-card{padding:40px 24px;}
    .section-head{margin-bottom:36px;}
    .about-card{padding:32px 24px;}
    .nav.scrolled .nav-inner{margin:8px 12px 0;max-width:none;padding:6px 14px;}
}