/* purged utility subset (replaces full Tailwind CDN ~2.9MB) */
*,::after,::before{box-sizing:border-box;border:0 solid #e5e7eb}
html{line-height:1.5;-webkit-text-size-adjust:100%}
body{margin:0;font-family:system-ui,-apple-system,'Segoe UI','Microsoft YaHei',sans-serif}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:inherit}
button,input{font:inherit}
.container{width:100%;margin-left:auto;margin-right:auto;padding-left:1rem;padding-right:1rem}
@media(min-width:640px){.container{max-width:640px}}
@media(min-width:768px){.container{max-width:768px}}
@media(min-width:1024px){.container{max-width:1024px}}
@media(min-width:1280px){.container{max-width:1280px}}
.flex{display:flex}.inline-flex{display:inline-flex}.grid{display:grid}.hidden{display:none}.block{display:block}
.flex-col{flex-direction:column}.flex-wrap{flex-wrap:wrap}
.items-center{align-items:center}.items-start{align-items:flex-start}.items-end{align-items:flex-end}
.justify-center{justify-content:center}.justify-between{justify-content:space-between}.justify-end{justify-content:flex-end}
.gap-1{gap:.25rem}.gap-2{gap:.5rem}.gap-3{gap:.75rem}.gap-4{gap:1rem}.gap-6{gap:1.5rem}.gap-8{gap:2rem}
.w-full{width:100%}.h-full{height:100%}.min-h-screen{min-height:100vh}
.max-w-xl{max-width:36rem}.max-w-2xl{max-width:42rem}.max-w-3xl{max-width:48rem}.max-w-4xl{max-width:56rem}.max-w-5xl{max-width:64rem}.max-w-6xl{max-width:72rem}.max-w-7xl{max-width:80rem}
.mx-auto{margin-left:auto;margin-right:auto}
.p-2{padding:.5rem}.p-3{padding:.75rem}.p-4{padding:1rem}.p-6{padding:1.5rem}.p-8{padding:2rem}
.px-2{padding-left:.5rem;padding-right:.5rem}.px-4{padding-left:1rem;padding-right:1rem}.px-6{padding-left:1.5rem;padding-right:1.5rem}.px-8{padding-left:2rem;padding-right:2rem}
.py-2{padding-top:.5rem;padding-bottom:.5rem}.py-3{padding-top:.75rem;padding-bottom:.75rem}.py-4{padding-top:1rem;padding-bottom:1rem}.py-8{padding-top:2rem;padding-bottom:2rem}.py-12{padding-top:3rem;padding-bottom:3rem}.py-16{padding-top:4rem;padding-bottom:4rem}.py-20{padding-top:5rem;padding-bottom:5rem}
.m-0{margin:0}.mt-2{margin-top:.5rem}.mt-4{margin-top:1rem}.mt-6{margin-top:1.5rem}.mt-8{margin-top:2rem}.mb-2{margin-bottom:.5rem}.mb-4{margin-bottom:1rem}.mb-6{margin-bottom:1.5rem}.mb-8{margin-bottom:2rem}.mb-12{margin-bottom:3rem}
.text-center{text-align:center}.text-left{text-align:left}.text-sm{font-size:.875rem;line-height:1.25rem}.text-base{font-size:1rem}.text-lg{font-size:1.125rem}.text-xl{font-size:1.25rem}.text-2xl{font-size:1.5rem}.text-3xl{font-size:1.875rem}.text-4xl{font-size:2.25rem}.text-5xl{font-size:3rem}
.font-medium{font-weight:500}.font-semibold{font-weight:600}.font-bold{font-weight:700}.font-extrabold{font-weight:800}
.leading-tight{line-height:1.25}.leading-relaxed{line-height:1.625}
.rounded{border-radius:.25rem}.rounded-md{border-radius:.375rem}.rounded-lg{border-radius:.5rem}.rounded-xl{border-radius:.75rem}.rounded-2xl{border-radius:1rem}.rounded-full{border-radius:9999px}
.shadow{box-shadow:0 1px 3px 0 rgb(0 0 0/.1),0 1px 2px -1px rgb(0 0 0/.1)}.shadow-lg{box-shadow:0 10px 15px -3px rgb(0 0 0/.1),0 4px 6px -4px rgb(0 0 0/.1)}.shadow-xl{box-shadow:0 20px 25px -5px rgb(0 0 0/.1),0 8px 10px -6px rgb(0 0 0/.1)}
.overflow-hidden{overflow:hidden}.relative{position:relative}.absolute{position:absolute}.fixed{position:fixed}.sticky{position:sticky}.inset-0{inset:0}.top-0{top:0}.z-10{z-index:10}.z-20{z-index:20}.z-50{z-index:50}
.object-cover{object-fit:cover}.object-contain{object-fit:contain}
.grid-cols-1{grid-template-columns:repeat(1,minmax(0,1fr))}.grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}
@media(min-width:768px){.md\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.md\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.md\:flex{display:flex}.md\:hidden{display:none}.md\:block{display:block}.md\:text-4xl{font-size:2.25rem}.md\:text-5xl{font-size:3rem}.md\:py-20{padding-top:5rem;padding-bottom:5rem}}
@media(min-width:1024px){.lg\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.lg\:flex{display:flex}.lg\:text-5xl{font-size:3rem}}
.text-white{color:#fff}.text-gray-200{color:#e5e7eb}.text-gray-300{color:#d1d5db}.text-gray-400{color:#9ca3af}.text-gray-500{color:#6b7280}.text-gray-600{color:#4b5563}.text-gray-700{color:#374151}.text-gray-800{color:#1f2937}.text-gray-900{color:#111827}
.bg-white{background-color:#fff}.bg-black{background-color:#000}.bg-transparent{background-color:transparent}
.bg-opacity-50{--tw-bg-opacity:0.5}.bg-opacity-80{--tw-bg-opacity:0.8}
.opacity-70{opacity:.7}.opacity-80{opacity:.8}.opacity-90{opacity:.9}
.transition{transition-property:color,background-color,border-color,text-decoration-color,fill,stroke,opacity,box-shadow,transform,filter;transition-timing-function:cubic-bezier(.4,0,.2,1);transition-duration:.15s}
.duration-300{transition-duration:.3s}.hover\:opacity-90:hover{opacity:.9}.hover\:scale-105:hover{transform:scale(1.05)}
.space-y-2>:not([hidden])~:not([hidden]){margin-top:.5rem}.space-y-4>:not([hidden])~:not([hidden]){margin-top:1rem}.space-x-4>:not([hidden])~:not([hidden]){margin-left:1rem}
.underline{text-decoration:underline}.uppercase{text-transform:uppercase}.tracking-wide{letter-spacing:.025em}
.w-8{width:2rem}.h-8{height:2rem}.w-10{width:2.5rem}.h-10{height:2.5rem}.w-12{width:3rem}.h-12{height:3rem}.w-16{width:4rem}.h-16{height:4rem}
.cursor-pointer{cursor:pointer}.select-none{-webkit-user-select:none;user-select:none}

/* dynamic utilities from HTML scan */
.gap-1{gap:0.25rem}
.gap-10{gap:2.5rem}
.gap-12{gap:3.0rem}
.gap-16{gap:4.0rem}
.gap-2{gap:0.5rem}
.gap-3{gap:0.75rem}
.gap-4{gap:1.0rem}
.gap-5{gap:1.25rem}
.gap-6{gap:1.5rem}
.gap-8{gap:2.0rem}
.h-1{height:0.25rem}
.h-10{height:2.5rem}
.h-12{height:3.0rem}
.h-16{height:4.0rem}
.h-4{height:1.0rem}
.h-40{height:10.0rem}
.h-48{height:12.0rem}
.h-60{height:15.0rem}
.h-64{height:16.0rem}
.h-8{height:2.0rem}
.h-80{height:20.0rem}
.h-96{height:24.0rem}
.mb-10{margin-bottom:2.5rem}
.mb-12{margin-bottom:3.0rem}
.mb-16{margin-bottom:4.0rem}
.mb-2{margin-bottom:0.5rem}
.mb-20{margin-bottom:5.0rem}
.mb-3{margin-bottom:0.75rem}
.mb-4{margin-bottom:1.0rem}
.mb-6{margin-bottom:1.5rem}
.mb-8{margin-bottom:2.0rem}
.ml-2{margin-left:0.5rem}
.ml-4{margin-left:1.0rem}
.mr-2{margin-right:0.5rem}
.mr-3{margin-right:0.75rem}
.mt-12{margin-top:3.0rem}
.mt-16{margin-top:4.0rem}
.mt-20{margin-top:5.0rem}
.mt-24{margin-top:6.0rem}
.mt-4{margin-top:1.0rem}
.my-4{margin-top:1.0rem;margin-bottom:1.0rem}
.my-6{margin-top:1.5rem;margin-bottom:1.5rem}
.opacity-10{opacity:0.1}
.opacity-20{opacity:0.2}
.opacity-5{opacity:0.05}
.opacity-50{opacity:0.5}
.p-10{padding:2.5rem}
.p-12{padding:3.0rem}
.p-2{padding:0.5rem}
.p-3{padding:0.75rem}
.p-8{padding:2.0rem}
.pb-1{padding-bottom:0.25rem}
.pb-10{padding-bottom:2.5rem}
.pb-12{padding-bottom:3.0rem}
.pb-16{padding-bottom:4.0rem}
.pb-2{padding-bottom:0.5rem}
.pb-32{padding-bottom:8.0rem}
.pb-4{padding-bottom:1.0rem}
.pl-11{padding-left:2.75rem}
.pl-6{padding-left:1.5rem}
.pl-7{padding-left:1.75rem}
.pl-8{padding-left:2.0rem}
.pr-8{padding-right:2.0rem}
.pt-16{padding-top:4.0rem}
.pt-20{padding-top:5.0rem}
.pt-24{padding-top:6.0rem}
.pt-28{padding-top:7.0rem}
.pt-4{padding-top:1.0rem}
.pt-8{padding-top:2.0rem}
.px-10{padding-left:2.5rem;padding-right:2.5rem}
.px-2{padding-left:0.5rem;padding-right:0.5rem}
.px-3{padding-left:0.75rem;padding-right:0.75rem}
.px-4{padding-left:1.0rem;padding-right:1.0rem}
.px-6{padding-left:1.5rem;padding-right:1.5rem}
.px-8{padding-left:2.0rem;padding-right:2.0rem}
.py-1{padding-top:0.25rem;padding-bottom:0.25rem}
.py-2{padding-top:0.5rem;padding-bottom:0.5rem}
.py-24{padding-top:6.0rem;padding-bottom:6.0rem}
.py-3{padding-top:0.75rem;padding-bottom:0.75rem}
.py-4{padding-top:1.0rem;padding-bottom:1.0rem}
.py-5{padding-top:1.25rem;padding-bottom:1.25rem}
.text-2xl{font-size:1.5rem;line-height:1.15}
.text-3xl{font-size:1.875rem;line-height:1.15}
.text-4xl{font-size:2.25rem;line-height:1.15}
.text-5xl{font-size:3rem;line-height:1.15}
.w-10{width:2.5rem}
.w-12{width:3.0rem}
.w-16{width:4.0rem}
.w-4{width:1.0rem}
.w-56{width:14.0rem}
.w-64{width:16.0rem}
.w-8{width:2.0rem}
.w-80{width:20.0rem}
.w-96{width:24.0rem}
:root {
    /* Brushed Titanium (拉丝钛合金) 配色 */
    --ti-dark: #1a1c1f;
    --ti-base: #25282c;
    --ti-light: #35393f;
    --ti-highlight: #4d525b;
    
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --text-accent: #38bdf8; /* 冷冽蓝，代表科技与坚固 */
    
    --ti-shadow: 6px 6px 15px rgba(0, 0, 0, 0.6), -4px -4px 10px rgba(255, 255, 255, 0.03);
    --ti-bevel: inset 1px 1px 1px rgba(255, 255, 255, 0.15), inset -1px -1px 2px rgba(0, 0, 0, 0.5);
}

body {
    background-color: var(--ti-base);
    /* 细腻的横向金属拉丝纹理与底部暗影渐变 */
    background-image: 
        repeating-linear-gradient(
            0deg,
            rgba(255, 255, 255, 0.015) 0px,
            rgba(255, 255, 255, 0.015) 1px,
            transparent 1px,
            transparent 3px
        ),
        linear-gradient(135deg, #1f2226 0%, #111315 100%);
    background-attachment: fixed;
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* 顶部导航 - 金属面板 */
.ti-nav {
    background: rgba(26, 28, 31, 0.85);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    position: sticky;
    top: 0;
    z-index: 50;
}

/* 钛合金卡片：带有高光倒角 */
.ti-card {
    background: linear-gradient(145deg, #2a2d32, #1f2226);
    border-radius: 6px;
    border: 1px solid #15171a;
    box-shadow: var(--ti-shadow), var(--ti-bevel);
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

/* 卡片表面的拉丝反光斜纹 */
.ti-card::after {
    content: '';
    position: absolute;
    top: -50%; left: -50%; width: 200%; height: 200%;
    background: linear-gradient(
        to right, 
        rgba(255, 255, 255, 0) 0%, 
        rgba(255, 255, 255, 0.03) 50%, 
        rgba(255, 255, 255, 0) 100%
    );
    transform: rotate(30deg);
    pointer-events: none;
    transition: transform 0.5s ease;
}

.ti-card:hover {
    transform: translateY(-4px);
    box-shadow: 8px 8px 20px rgba(0, 0, 0, 0.7), -2px -2px 8px rgba(255, 255, 255, 0.05), var(--ti-bevel);
}

.ti-card:hover::after {
    transform: rotate(30deg) translateX(30%);
}

/* 金属雕刻按钮 */
.ti-btn {
    background: linear-gradient(to bottom, #4a4f58, #2a2d32);
    color: #ffffff;
    font-weight: bold;
    border-radius: 4px;
    border: 1px solid #111315;
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.2), 0 4px 10px rgba(0, 0, 0, 0.4);
    text-shadow: 0 -1px 1px rgba(0, 0, 0, 0.6);
    transition: all 0.2s ease;
    display: inline-block;
    text-align: center;
    letter-spacing: 1px;
}

.ti-btn:hover {
    background: linear-gradient(to bottom, #565c66, #33373e);
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.25), 0 6px 15px rgba(0, 0, 0, 0.5);
    transform: translateY(-1px);
}

/* 金属拉丝空心按钮 */
.ti-btn-outline {
    background: transparent;
    color: var(--text-accent);
    font-weight: bold;
    border-radius: 4px;
    border: 1px solid var(--text-accent);
    box-shadow: inset 0 0 5px rgba(56, 189, 248, 0.1), 0 2px 5px rgba(0, 0, 0, 0.3);
    transition: all 0.2s ease;
    display: inline-block;
    text-align: center;
    letter-spacing: 1px;
}

.ti-btn-outline:hover {
    background: rgba(56, 189, 248, 0.1);
    box-shadow: inset 0 0 10px rgba(56, 189, 248, 0.2), 0 4px 10px rgba(0, 0, 0, 0.4);
    transform: translateY(-1px);
}

/* 博客/白板区 - 暗色系拉丝底盘 */
.blog-section {
    background-color: #1a1c1f;
    position: relative;
    border-top: 1px solid #000;
    border-bottom: 1px solid #000;
    box-shadow: inset 0 10px 20px rgba(0, 0, 0, 0.5), inset 0 -10px 20px rgba(0, 0, 0, 0.5);
}

.blog-card {
    background-color: var(--ti-base);
    border-radius: 6px;
    border: 1px solid rgba(255,255,255,0.05);
    box-shadow: var(--ti-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden;
    position: relative;
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: 10px 10px 25px rgba(0, 0, 0, 0.8);
    border-color: rgba(255,255,255,0.1);
}

/* 科技蓝渐变字 */
.gradient-text {
    background: linear-gradient(to right, #7dd3fc, #38bdf8, #0284c7);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.accent-text {
    color: var(--text-accent);
}

img {
    border-radius: 4px;
    object-fit: cover;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* === perf: reduce motion & lower GPU cost === */
.feature-card,
.blog-card,
.hero-content,
.glass-panel,
.pearl-card {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}
.navbar {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation: none !important;
        transition: none !important;
        scroll-behavior: auto !important;
    }
}