/* Reset & Base */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', 'Microsoft YaHei', sans-serif; 
    background: #0a0a0a; 
    color: #e0e0e0; 
    line-height: 1.6; 
    min-height: 100vh; 
    overflow-x: hidden; 
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* Futuristic Deconstructivism Variables */
:root {
    --fd-bg: #0a0a0a;
    --fd-card: #141414;
    --fd-red: #ff2a2a;
    --fd-blue: #00e5ff;
    --fd-text: #f0f0f0;
    --fd-muted: #888888;
    --fd-border: #333333;
}

/* Navigation */
.navbar { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    padding: 20px 5%; 
    background: rgba(10, 10, 10, 0.9); 
    border-bottom: 1px solid var(--fd-border); 
    position: sticky; 
    top: 0; 
    z-index: 100; 
    backdrop-filter: blur(2px);
}
.nav-logo { 
    font-size: 24px; 
    font-weight: 900; 
    color: var(--fd-text); 
    display: flex; 
    align-items: center; 
    gap: 10px; 
    letter-spacing: 2px;
    text-transform: uppercase;
}
.nav-logo svg { fill: var(--fd-blue); }
.nav-links { display: flex; gap: 35px; align-items: center; font-weight: bold; font-size: 14px; letter-spacing: 1px; }
.nav-links a { 
    transition: all 0.3s; 
    color: var(--fd-muted); 
    position: relative;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px; left: 0; width: 0; height: 2px;
    background: var(--fd-red);
    transition: width 0.3s;
}
.nav-links a:hover { color: var(--fd-text); }
.nav-links a:hover::after { width: 100%; }

.btn-download-nav { 
    padding: 10px 24px; 
    background: transparent;
    border: 1px solid var(--fd-blue);
    color: var(--fd-blue) !important; 
    transition: all 0.3s; 
    text-transform: uppercase;
}
.btn-download-nav::after { display: none; }
.btn-download-nav:hover { 
    background: var(--fd-blue);
    color: #000 !important; 
    box-shadow: 4px 4px 0 var(--fd-red);
    transform: translate(-2px, -2px);
}

/* Hero Section - Deconstructivism */
.hero { 
    position: relative; 
    padding: 120px 5% 80px; 
    text-align: center; 
    min-height: 95vh; 
    display: flex; 
    flex-direction: column; 
    justify-content: center; 
    align-items: center; 
}

/* Scattered Characters */
.deconstruct-bg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}
.char {
    position: absolute;
    font-size: 25vw;
    font-weight: 900;
    color: transparent;
    -webkit-text-stroke: 1px rgba(255, 255, 255, 0.05);
    line-height: 1;
    user-select: none;
}
.char-zhi { top: -5%; left: -5%; transform: rotate(-15deg); }
.char-fei { top: 20%; right: -5%; transform: rotate(10deg); }
.char-ji { bottom: -10%; left: 30%; transform: rotate(-5deg); }

/* Wires */
.wires-svg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: 1;
}

.hero-content { z-index: 3; max-width: 800px; margin: 0 auto; position: relative; background: rgba(10,10,10,0.6); padding: 40px; backdrop-filter: blur(2px); border: 1px solid var(--fd-border); }
.hero h1 { 
    font-size: 58px; 
    margin-bottom: 20px; 
    color: var(--fd-text); 
    line-height: 1.1; 
    letter-spacing: -1px;
    text-transform: uppercase;
}
.hero h1 span { color: var(--fd-red); }
.hero p { 
    font-size: 18px; 
    margin-bottom: 40px; 
    color: var(--fd-muted); 
    font-weight: 300; 
    letter-spacing: 1px;
}

.hero-buttons { display: flex; gap: 20px; justify-content: center; margin-bottom: 50px; flex-wrap: wrap; }
.btn-fd { 
    padding: 16px 40px; 
    font-size: 16px; 
    font-weight: bold; 
    background: transparent; 
    color: var(--fd-text); 
    border: 1px solid var(--fd-text);
    transition: all 0.3s; 
    cursor: pointer; 
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
}
.btn-fd:hover { 
    background: var(--fd-text); 
    color: #000;
}
.btn-pc { 
    border-color: var(--fd-blue);
    color: var(--fd-blue);
}
.btn-pc:hover { 
    background: var(--fd-blue);
    color: #000;
    box-shadow: 6px 6px 0 var(--fd-red);
    transform: translate(-3px, -3px);
}

.hero-images { 
    display: flex; 
    justify-content: center; 
    gap: 20px; 
    z-index: 3; 
    align-items: flex-end; 
    position: relative;
    margin-top: 40px;
}
.hero-images img { 
    max-width: 28%; 
    filter: grayscale(100%) contrast(1.2);
    border: 1px solid var(--fd-border);
    transition: all 0.4s; 
}
.hero-images img:hover { 
    filter: grayscale(0%);
    transform: translateY(-10px); 
    border-color: var(--fd-blue);
    box-shadow: 8px 8px 0 var(--fd-red);
}

/* Features Section */
.features { padding: 120px 5%; background: #0f0f0f; position: relative; border-top: 1px solid var(--fd-border); }
.section-title { 
    text-align: center; 
    font-size: 36px; 
    margin-bottom: 80px; 
    color: var(--fd-text); 
    text-transform: uppercase;
    letter-spacing: 4px;
}
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; max-width: 1200px; margin: 0 auto; background: var(--fd-border); border: 1px solid var(--fd-border); }
.feature-card { 
    background: var(--fd-card); 
    padding: 50px 40px; 
    transition: all 0.3s; 
    text-align: left; 
    position: relative;
}
.feature-card::before {
    content: '0' counter(card-counter);
    position: absolute;
    top: 20px; right: 20px;
    font-size: 14px;
    color: var(--fd-red);
    font-weight: bold;
}
.features-grid { counter-reset: card-counter; }
.feature-card { counter-increment: card-counter; }

.feature-card:hover { 
    background: #1a1a1a;
}
.feature-card h3 { 
    font-size: 20px; 
    margin-bottom: 20px; 
    color: var(--fd-blue); 
    text-transform: uppercase;
    letter-spacing: 1px;
}
.feature-card p { color: var(--fd-muted); font-size: 14px; line-height: 1.8; }

/* Blog Section */
.blog { padding: 120px 5%; background: #e0e0e0; color: #0a0a0a; }
.blog .section-title { color: #0a0a0a; }
.blog-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; max-width: 1100px; margin: 0 auto; }
.blog-card { 
    background: #fff; 
    display: flex; 
    flex-direction: column; 
    border: 1px solid #ccc; 
    transition: all 0.3s;
}
.blog-card:hover { 
    box-shadow: 10px 10px 0 var(--fd-blue);
    transform: translate(-5px, -5px);
}
.blog-card img { width: 100%; height: 280px; object-fit: cover; filter: grayscale(100%); transition: filter 0.3s; }
.blog-card:hover img { filter: grayscale(0%); }
.blog-content { padding: 40px; }
.blog-date { display: inline-block; color: var(--fd-red); font-size: 12px; margin-bottom: 15px; font-weight: bold; letter-spacing: 1px; text-transform: uppercase; }
.blog-content h3 { font-size: 24px; margin-bottom: 20px; color: #0a0a0a; line-height: 1.3; }
.blog-content p { color: #555; margin-bottom: 0; font-size: 15px; }
.btn-more { 
    display: block; 
    width: 240px; 
    margin: 80px auto 0; 
    text-align: center; 
    padding: 16px; 
    background: #0a0a0a; 
    color: #fff; 
    font-weight: bold; 
    transition: all 0.3s; 
    text-transform: uppercase;
    letter-spacing: 2px;
}
.btn-more:hover { 
    background: var(--fd-red); 
}

/* FAQ Section */
.faq { padding: 120px 5%; max-width: 900px; margin: 0 auto; background: var(--fd-bg); margin-bottom: 80px; }
.faq-item { 
    background: transparent; 
    margin-bottom: 0; 
    padding: 30px 0; 
    border-bottom: 1px solid var(--fd-border);
    transition: all 0.3s; 
}
.faq-item:first-child { border-top: 1px solid var(--fd-border); }
.faq-item:hover { 
    padding-left: 20px;
}
.faq-question { font-size: 20px; font-weight: bold; color: var(--fd-text); margin-bottom: 15px; display: flex; align-items: flex-start; gap: 15px; }
.faq-question::before { content: 'Q.'; color: var(--fd-red); font-size: 20px; }
.faq-answer { color: var(--fd-muted); line-height: 1.8; font-size: 15px; padding-left: 35px; }

/* Footer */
.footer { background: #050505; padding: 100px 5% 40px; color: var(--fd-text); border-top: 1px solid var(--fd-border); }
.footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 50px; max-width: 1200px; margin: 0 auto 60px; }
.footer-col h4 { font-size: 14px; color: var(--fd-blue); margin-bottom: 30px; font-weight: bold; text-transform: uppercase; letter-spacing: 2px; }
.footer-col ul li { margin-bottom: 15px; }
.footer-col ul li a { color: var(--fd-muted); transition: color 0.3s; font-size: 14px; }
.footer-col ul li a:hover { color: var(--fd-text); }
.footer-bottom { text-align: center; padding-top: 40px; border-top: 1px solid var(--fd-border); color: #555; font-size: 12px; letter-spacing: 1px; text-transform: uppercase; }

/* Page specific headers */
.page-header { 
    padding: 160px 5% 100px; 
    text-align: center; 
    background: #0a0a0a;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--fd-border);
}
.page-header h1 { 
    font-size: 48px; 
    color: var(--fd-text); 
    margin-bottom: 20px; 
    text-transform: uppercase;
    letter-spacing: 2px;
}
.page-header p { color: var(--fd-muted); font-size: 18px; max-width: 600px; margin: 0 auto; }

/* Download Page Grid */
.download-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2px; max-width: 1200px; margin: 80px auto; padding: 0 5%; background: var(--fd-border); border: 1px solid var(--fd-border); }
.download-card { 
    background: var(--fd-card); 
    padding: 60px 40px; 
    text-align: center; 
    transition: all 0.3s; 
}
.download-card:hover { 
    background: #1a1a1a;
}
.download-card h3 { color: var(--fd-text); font-size: 22px; margin-bottom: 20px; text-transform: uppercase; letter-spacing: 1px; }
.download-card p { color: var(--fd-muted); margin-bottom: 40px; font-size: 14px; line-height: 1.8; }

/* === 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;
    }
}

/* perf: limit decorative infinite layers on mid/low-end devices */
@media (max-width: 768px) {
    .bubble:nth-child(n+3),
    .tiny-plane:nth-child(n+3),
    .bg-shard:nth-child(n+4),
    .orb:nth-child(n+2) {
        display: none !important;
    }
}