* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-color: #121212;
    --surface-color: #1e1e1e;
    --card-bg: #1e1e1e;
    --brand-red: #fe2c55;
    --brand-red-glow: rgba(254, 44, 85, 0.4);
    --text-primary: #ffffff;
    --text-secondary: #8c8c8c;
    --border-subtle: rgba(255, 255, 255, 0.1);
    --font-ui: 'Inter', system-ui, -apple-system, sans-serif;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    width: 100%;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-ui);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    width: 100%;
}

/* Cinematic Noise Texture */
.noise-texture {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSI1MDAiIGhlaWdodD0iNTAwIj48ZmlsdGVyIGlkPSJ4Ij48ZmVUdXJidWxlbmNlIHR5cGU9ImZyYWN0YWxOb2lzZSIgYmFzZUZyZXF1ZW5jeT0iMC42IiBzdGl0Y2hUaWxlcz0ic3RpdGNoIi8+PC9ZmlsdGVyPjxyZWN0IHdpZHRoPSIxMDAlIiBoZWlnaHQ9IjEwMCUiIGZpbHRlcj0idXJsKCN4KSIgb3BhY2l0eT0iMC4wNSIvPjwvc3ZnPg==');
    pointer-events: none;
    z-index: 900;
    mix-blend-mode: overlay;
    opacity: 0.4;
}

/* Nav */
.modern-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 1.5rem;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    backdrop-filter: blur(16px); /* 增加模糊度 */
    background: rgba(20, 20, 20, 0.75); /* 更深的暗背景 */
    border-bottom: 1px solid rgba(255, 255, 255, 0.08); /* 更柔和的边缘 */
}

.brand-logo {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    line-height: none;
}

.brand-logo span {
    line-height: 1;
}

.brand-logo svg {
    transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.brand-logo:hover svg {
    transform: rotate(-12deg);
}

.logo-icon img { width: 32px; height: 32px; border-radius: 8px; }

.nav-menu a {
    color: var(--text-primary); /* 直接使用最亮文本色，提升对比度 */
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    margin-left: 2rem;
    transition: all 0.3s;
    opacity: 0.6; /* 默认略显暗淡 */
}

.nav-menu a:hover { 
    opacity: 1; /* 悬停时全亮 */
    color: var(--brand-red); /* 悬停颜色改为品牌色 */
}

.nav-btn-download {
    background: var(--brand-red);
    color: white;
    padding: 6px 14px;
    border-radius: 99px; /* 圆角胶囊风格 */
    font-size: 1rem;
    font-weight: 700;
    text-decoration: none;
    margin-left: 1.2rem; /* 距离 Logo 的间距 */
    box-shadow: 0 4px 15px rgba(254, 44, 85, 0.3);
    transition: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1); /* 弹性超丝滑动画 */
    opacity: 0;
    transform: translateX(-20px) scale(0.8); /* 从 Logo 方向滑出 */
    pointer-events: none;
    display: flex;
    align-items: center;
    gap: 6px;
    letter-spacing: 0.05em;
}

.nav-btn-download.visible {
    opacity: 1;
    transform: translateX(0) scale(1);
    pointer-events: auto;
}

.nav-btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--brand-red-glow);
}

/* Hero Bento Layout */
.hero-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 8rem 3rem 10rem; /* 增加底部留白从 4rem 到 10rem */
    max-width: 1400px;
    margin: 0 auto;
}

.hero-main {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 4.5rem;
    line-height: 1.05;
    font-weight: 700;
    letter-spacing: -2px;
    margin-bottom: 1.5rem;
}

.highlight {
    color: var(--brand-red);
    position: relative;
    display: inline-block;
}

.highlight::after {
    content: '';
    position: absolute;
    bottom: 5px;
    left: 0;
    width: 100%;
    height: 15px;
    background: var(--brand-red);
    opacity: 0.2;
    filter: blur(8px);
    z-index: -1;
}

.hero-desc {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    max-width: 480px;
    line-height: 1.6;
}

/* Action Row & Buttons */
.action-row {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.download-group {
    display: flex;
    gap: 1rem;
}

.btn-fill {
    background: var(--brand-red);
    color: white;
    padding: 14px 24px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 20px var(--brand-red-glow);
    font-size: 0.95rem;
    position: relative;
}

.btn-fill:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--brand-red-glow);
}

.btn-glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: white;
    padding: 14px 24px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    font-size: 0.95rem;
}

.btn-glass:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-outline {
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary); /* 弱化次级按钮 */
    padding: 14px 24px;
    border-radius: 8px;
    font-weight: 500;
    font-size: 0.9rem;
    text-decoration: none;
    transition: all 0.2s;
}

.btn-outline:hover { 
    background: rgba(255,255,255,0.05); 
    color: var(--text-primary);
    border-color: rgba(255,255,255,0.2);
}

/* Icons within buttons */
.btn-icon-win, .btn-icon-mac {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.badge-recommend {
    position: absolute;
    top: -8px;
    right: -8px;
    background: #FFD700;
    color: #000;
    font-size: 10px;
    font-weight: 800;
    padding: 2px 6px;
    border-radius: 4px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
    z-index: 10;
    letter-spacing: 0.1em;
}

.text-weak {
    font-size: 0.8em;
    opacity: 0.4;
    margin-left: 4px;
    font-weight: 400;
}

/* Visual Side */
.hero-visual {
    position: relative;
}

.app-window {
    background: #000;
    border-radius: 12px;
    box-shadow: 0 40px 80px rgba(0,0,0,0.6);
    border: 1px solid rgba(255,255,255,0.1);
    position: relative;
    z-index: 10;
    transform: perspective(1200px) rotateY(-8deg) rotateX(4deg);
    transition: transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
    overflow: hidden; /* 实现裁切的关键 */
}

.app-window:hover {
    transform: perspective(1200px) rotateY(0deg) rotateX(0deg);
}

.mockup-img { 
    width: calc(100% + 12px); /* 略微放大以覆盖边缘 */
    margin: -2px; /* 四周向外偏移以裁掉原图边缘 */
    display: block; 
    border-radius: 6px; 
    max-width: none;
}

/* Bento Grid Features */
.features-container {
    padding: 12rem 3rem 6rem; /* 增加顶部留白从 6rem 到 12rem */
    max-width: 1400px;
    margin: 0 auto;
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 300px);
    gap: 1.5rem;
}

.bento-card {
    background: linear-gradient(160deg, rgba(30, 30, 30, 0.6) 0%, rgba(20, 20, 20, 0.8) 100%);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.bento-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(800px circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(255, 255, 255, 0.06), transparent 40%);
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    z-index: 1;
}

.bento-card:hover::before {
    opacity: 1;
}

.bento-card:hover {
    transform: translateY(-5px);
    border-color: rgba(254, 44, 85, 0.3);
    box-shadow: 0 20px 40px rgba(0,0,0,0.5), 0 0 20px rgba(254, 44, 85, 0.1);
}

.card-content {
    z-index: 2;
}

.card-content h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    background: linear-gradient(to right, #fff, #ccc);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.card-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.card-icon-lg {
    font-size: 6rem;
    opacity: 0.05;
    position: absolute;
    bottom: -20px;
    right: -20px;
    transform: rotate(-15deg);
    transition: transform 0.4s ease;
    filter: grayscale(100%);
}

.bento-card:hover .card-icon-lg {
    transform: rotate(0deg) scale(1.1);
    opacity: 0.1;
    filter: grayscale(0%);
}

.span-2 { grid-column: span 2; }
.row-2 { grid-row: span 2; }

.span-2 { grid-column: span 2; }
.row-2 { grid-row: span 2; }

/* Security Section - Refined Slim Style */
.security-seal {
    margin-top: 2.5rem;
    padding: 0.6rem 1rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 100px; /* Pill shape for cleaner look */
    display: inline-flex;
    align-items: center;
    gap: 1.2rem;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.security-seal:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(0, 255, 127, 0.3);
    transform: translateY(-1px);
}

.seal-main {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #00ff7f;
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 0.02em;
}

.seal-details {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.7rem;
    color: var(--text-secondary);
    border-left: 1px solid rgba(255, 255, 255, 0.1);
    padding-left: 1.2rem;
}

.hash-pill {
    font-family: 'JetBrains Mono', monospace;
    opacity: 0.3;
}

.report-link-slim {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 0.75rem;
    opacity: 0.6;
    border-bottom: 1px solid transparent;
    transition: all 0.2s;
}

.report-link-slim:hover {
    opacity: 1;
    color: #00ff7f;
    border-bottom-color: #00ff7f;
}

/* Footer */
.simple-footer {
    border-top: 1px solid var(--border-subtle);
    padding: 3rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

@media (max-width: 1024px) {
    .hero-wrapper {
        padding: 6rem 2rem;
    }

    .hero-main {
        grid-template-columns: 1fr;
        gap: 4rem;
        text-align: center;
    }

    .hero-content h1 {
        font-size: 3.5rem;
    }

    .hero-desc {
        margin: 0 auto 2.5rem;
    }

    .action-row {
        justify-content: center;
    }

    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: auto;
    }

    .app-window {
        transform: none !important;
        margin-top: 2rem;
    }
}

@media (max-width: 768px) {
    .modern-nav {
        padding: 1rem 1.5rem;
    }

    .nav-menu {
        display: none; /* Mobile menu implementation omitted for speed, keeping clean */
    }

    .hero-content h1 {
        font-size: 2.5rem;
        letter-spacing: -1px;
    }

    .hero-desc {
        font-size: 1rem;
    }

    .action-row {
        flex-direction: column;
        width: 100%;
    }

    .btn-fill, .btn-outline {
        width: 100%;
        justify-content: center;
    }

    .bento-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .span-2 { grid-column: auto; }
    .row-2 { grid-row: auto; }

    .bento-card {
        padding: 1.5rem;
        min-height: 200px;
    }

    .card-icon-lg {
        font-size: 5rem;
    }
}