/**
 * 基础样式
 * 包含全局样式、字体、滚动条、毛玻璃效果、滚动动效系统等
 */

/* ============================================
   字体加载优化
   ============================================ */
body {
    font-family: 'Plus Jakarta Sans', 
                 -apple-system, 
                 BlinkMacSystemFont, 
                 'Segoe UI', 
                 Roboto, 
                 'Helvetica Neue', 
                 Arial, 
                 'Noto Sans', 
                 sans-serif;
    font-synthesis: none;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: #FFFFFF;
    color: #0F172A;
    overflow-x: hidden;
}

/* 代码/等宽字体回退 */
.font-mono, code, pre {
    font-family: 'Space Grotesk', 
                 ui-monospace, 
                 SFMono-Regular, 
                 'SF Mono', 
                 Menlo, 
                 Consolas, 
                 'Liberation Mono', 
                 monospace;
}

/* ============================================
   顶级滚动动效系统 - GPU加速，高性能
   ============================================ */

/* 基础入场动画状态 */
.scroll-reveal {
    opacity: 0;
    transform: translateY(60px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* 从左侧滑入 */
.scroll-reveal-left {
    opacity: 0;
    transform: translateX(-80px);
    transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.scroll-reveal-left.revealed {
    opacity: 1;
    transform: translateX(0);
}

/* 从右侧滑入 */
.scroll-reveal-right {
    opacity: 0;
    transform: translateX(80px);
    transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.scroll-reveal-right.revealed {
    opacity: 1;
    transform: translateX(0);
}

/* 缩放入场 */
.scroll-reveal-scale {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

.scroll-reveal-scale.revealed {
    opacity: 1;
    transform: scale(1);
}

/* 模糊揭示效果 */
.scroll-reveal-blur {
    opacity: 0;
    filter: blur(20px);
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                filter 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, filter, transform;
}

.scroll-reveal-blur.revealed {
    opacity: 1;
    filter: blur(0);
    transform: translateY(0);
}

/* 错开延迟 - 用于子元素 */
.stagger-1 { transition-delay: 0.05s !important; }
.stagger-2 { transition-delay: 0.1s !important; }
.stagger-3 { transition-delay: 0.15s !important; }
.stagger-4 { transition-delay: 0.2s !important; }
.stagger-5 { transition-delay: 0.25s !important; }
.stagger-6 { transition-delay: 0.3s !important; }

/* Section 级别的视差层 */
.parallax-bg {
    will-change: transform;
    transition: transform 0.1s linear;
}

/* 滚动时的平滑过渡背景 */
section {
    position: relative;
    transition: background-color 0.5s ease;
}

/* 屏幕切换时的渐变遮罩效果 */
.section-transition-overlay {
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0;
    background: linear-gradient(
        180deg,
        transparent 0%,
        rgba(255, 255, 255, 0.03) 50%,
        transparent 100%
    );
    transition: opacity 0.6s ease;
    z-index: 1;
}

section.in-view .section-transition-overlay {
    opacity: 1;
}

/* 标题文字的特殊揭示动画 */
.title-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.title-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* 卡片悬浮入场 */
.card-float-in {
    opacity: 0;
    transform: translateY(40px) rotateX(10deg);
    transform-origin: center bottom;
    transition: opacity 0.7s cubic-bezier(0.34, 1.56, 0.64, 1),
                transform 0.7s cubic-bezier(0.34, 1.56, 0.64, 1);
    will-change: opacity, transform;
}

.card-float-in.revealed {
    opacity: 1;
    transform: translateY(0) rotateX(0);
}

/* 高级：行文字逐行显示 */
.line-by-line > * {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.line-by-line.revealed > *:nth-child(1) { transition-delay: 0s; opacity: 1; transform: translateY(0); }
.line-by-line.revealed > *:nth-child(2) { transition-delay: 0.08s; opacity: 1; transform: translateY(0); }
.line-by-line.revealed > *:nth-child(3) { transition-delay: 0.16s; opacity: 1; transform: translateY(0); }
.line-by-line.revealed > *:nth-child(4) { transition-delay: 0.24s; opacity: 1; transform: translateY(0); }
.line-by-line.revealed > *:nth-child(5) { transition-delay: 0.32s; opacity: 1; transform: translateY(0); }

/* 滚动指示器脉冲 */
@keyframes scroll-pulse {
    0%, 100% { opacity: 1; transform: translateY(0); }
    50% { opacity: 0.5; transform: translateY(8px); }
}

.scroll-indicator {
    animation: scroll-pulse 2s ease-in-out infinite;
}

/* ============================================
   减少动画偏好 - 性能优化增强版
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    /* 滚动揭示动画 */
    .scroll-reveal,
    .scroll-reveal-left,
    .scroll-reveal-right,
    .scroll-reveal-scale,
    .scroll-reveal-blur,
    .card-float-in,
    .title-reveal {
        opacity: 1 !important;
        transform: none !important;
        filter: none !important;
        transition: none !important;
    }
    
    /* 禁用所有无限循环动画 */
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    /* 禁用背景光晕动画 */
    .animate-blob,
    .animate-pulse,
    .animate-ping,
    .animate-bounce,
    .animate-float,
    .aura-blob,
    .ambient-orb {
        animation: none !important;
    }
    
    /* 简化毛玻璃效果 */
    .feishu-glass,
    .ice-glass,
    .glass-premium,
    .copilot-card,
    .illu-card,
    .illu-glass-card {
        backdrop-filter: blur(4px) !important;
        -webkit-backdrop-filter: blur(4px) !important;
    }
    
    /* 隐藏纯装饰性动画元素 */
    .aura-blob,
    .ambient-orb,
    .glow-orb-engine,
    .noise-overlay,
    .grain-overlay {
        display: none !important;
    }
}

/* ============================================
   毛玻璃效果
   ============================================ */
.feishu-glass {
    background: var(--glass-white);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border: 1px solid rgba(255, 255, 255, 0.6);
    box-shadow: 0 8px 32px rgba(31, 35, 41, 0.04), 0 1px 2px rgba(31, 35, 41, 0.02);
}

.shadow-refined {
    box-shadow: 0 12px 40px rgba(31, 35, 41, 0.08);
}

/* 磨砂冰感核心样式 */
.ice-glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border-color);
    box-shadow: 0 8px 32px 0 var(--glass-shadow-color);
}

.ice-card {
    transition: all 0.5s cubic-bezier(0.23, 1, 0.32, 1);
}

.ice-card:hover {
    transform: translateY(-8px) scale(1.01);
    background: rgba(255, 255, 255, 0.85);
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.02);
    border-color: rgba(22, 93, 255, 0.2);
}

/* 顶级毛玻璃：晶莹质感 */
.glass-premium {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.75), rgba(255, 255, 255, 0.45));
    backdrop-filter: blur(12px) saturate(190%);
    -webkit-backdrop-filter: blur(12px) saturate(190%);
    border: 1px solid rgba(255, 255, 255, 0.6);
    box-shadow: 0 4px 24px -1px rgba(0, 0, 0, 0.02);
}

/* 玻璃卡片通用样式 */
.glass-card {
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
}

.glass-card-theme {
    background: rgba(22, 93, 255, 0.1);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(22, 93, 255, 0.2);
}

/* ============================================
   文字样式
   ============================================ */
/* 纯色文案 */
.text-gradient {
    color: #2563EB;
}

/* 顶级设计师配色方案：高级渐变 */
.text-gradient-premium {
    background: linear-gradient(135deg, #165DFF 0%, #7c3aed 50%, #2563EB 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
    filter: drop-shadow(0 0 30px rgba(37,99,236,0.1));
}

/* 极致字间距修正 */
h1 span {
    letter-spacing: -0.04em;
}

/* ============================================
   背景效果
   ============================================ */
/* 弥散背景专用混合模式 */
.mesh-gradient-container {
    filter: contrast(120%) brightness(105%);
    mask-image: linear-gradient(to bottom, black 60%, transparent 100%);
}

/* 噪点质感层 */
.noise-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    opacity: 0.04;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* 噪点纹理背景 */
.grain-overlay {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
    opacity: 0.02;
    pointer-events: none;
    mix-blend-mode: overlay;
}

/* 背景网格系统 */
.bg-grid {
    position: fixed;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0,0,0,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.02) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(circle at center, black, transparent 90%);
    pointer-events: none;
    z-index: -1;
}

/* 磁吸网格交互 */
.magnetic-grid-active {
    background-image: 
        radial-gradient(
            circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
            rgba(22, 93, 255, 0.08) 0%,
            transparent 40%
        ),
        linear-gradient(rgba(0,0,0,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.02) 1px, transparent 1px) !important;
}

/* 插画区网格背景 */
.illustration-grid {
    background-image: 
        linear-gradient(to right, #f1f5f9 1px, transparent 1px),
        linear-gradient(to bottom, #f1f5f9 1px, transparent 1px);
    background-size: 40px 40px;
}

/* WebGL Canvas Container */
#singularity-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ============================================
   滚动条和进度条
   ============================================ */
/* 滚动进度条 */
#scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(to right, #165DFF, #0045E6);
    z-index: 100;
    width: 0%;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: #FFFFFF;
}
::-webkit-scrollbar-thumb {
    background: #E2E8F0;
    border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
    background: #CBD5E1;
}

/* ============================================
   3D 和变换辅助
   ============================================ */
.perspective-1000 {
    perspective: 1000px;
}
.preserve-3d {
    transform-style: preserve-3d;
}

/* 路径动画 */
.path-flow {
    stroke-dasharray: 1000;
    stroke-dashoffset: 1000;
    animation: dash 5s linear infinite;
}

/* 主题发光效果 */
.theme-glow {
    box-shadow: 0 0 20px rgba(22, 93, 255, 0.1);
}

/* 转场揭秘效果 */
.reveal-effect {
    will-change: clip-path;
}

/* 发光边框 */
.glow-border {
    position: relative;
}
.glow-border::after {
    content: '';
    position: absolute;
    inset: -1px;
    background: linear-gradient(var(--angle, 0deg), transparent, #fbbf24, transparent);
    border-radius: inherit;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s;
}
.glow-border:hover::after {
    opacity: 1;
}

@property --angle {
    syntax: '<angle>';
    initial-value: 0deg;
    inherits: false;
}

/* 动画延迟辅助类 */
.animation-delay-2000 { animation-delay: 2s; }
.animation-delay-4000 { animation-delay: 4s; }

/* ============================================
   响应式基础调整
   ============================================ */
@media (max-width: 768px) {
    section {
        padding-top: 4rem;
        padding-bottom: 4rem;
    }

    .ice-glass {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    /*
     * 注意：原本这里给 .max-w-7xl 全局加左右 padding，
     * 但站内 <section> 已自带 px-6 md:px-8，会造成双重 padding；
     * 已移除该规则。如需调整页面边距，请改 section 上的 px-* 类，
     * 或在容器上显式声明（如 px-6）。
     */
}

/* 移动端导航菜单溢出禁用 */
.mobile-menu-open {
    overflow: hidden;
}

/* ============================================
   锚点偏移：防止固定导航栏遮住 section 标题
   初始值由 JS（initNavActiveState）在 load 后
   读取真实导航底部并覆盖，以适配公告条展开/收起
   ============================================ */
html {
    scroll-padding-top: 120px;
}

/* ============================================
   导航活跃态（由 IntersectionObserver 注入）
   ============================================ */
#main-nav a.nav-link-active {
    color: #165DFF;
}

#mobile-nav-drawer a.nav-link-active {
    color: #165DFF;
    background: #eff6ff;
}