/**
 * 翔迅科技年会抽奖 - 样式表
 * @version 2.0.0
 * @author 翔迅科技
 */

/* ==================== CSS 变量 ==================== */
:root {
    /* 主色调 */
    --color-cyan-primary: #22d3ee;
    --color-cyan-secondary: #06b6d4;
    --color-cyan-glow: #00f2ff;
    --color-blue-primary: #3b82f6;
    --color-blue-secondary: #2563eb;
    
    /* 背景色 */
    --bg-space-dark: #0d1b2a;
    --bg-space-navy: #1b263b;
    --bg-overlay: rgba(13, 27, 42, 0.8);
    
    /* 文字颜色 */
    --text-white: #ffffff;
    --text-white-90: rgba(255, 255, 255, 0.9);
    --text-white-80: rgba(255, 255, 255, 0.8);
    --text-white-60: rgba(255, 255, 255, 0.6);
    --text-white-40: rgba(255, 255, 255, 0.4);
    --text-white-20: rgba(255, 255, 255, 0.2);
    
    /* 边框颜色 */
    --border-cyan-primary: rgba(34, 211, 238, 0.2);
    --border-cyan-secondary: rgba(34, 211, 238, 0.1);
    --border-cyan-hover: rgba(34, 211, 238, 0.4);
    --border-white: rgba(255, 255, 255, 0.05);
    --border-white-hover: rgba(255, 255, 255, 0.1);
    
    /* 阴影 */
    --shadow-card: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --shadow-button: 0 20px 40px rgba(6, 182, 212, 0.3);
    --shadow-glow: 0 0 20px rgba(34, 211, 238, 0.2);
    
    /* 动画时间 */
    --duration-fast: 150ms;
    --duration-normal: 300ms;
    --duration-slow: 1000ms;
    --duration-orbit: 30s;
    --duration-pulse: 15s;
    
    /* 缓动函数 */
    --ease-out: cubic-bezier(0.215, 0.61, 0.355, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

/* ==================== 基础重置 ==================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, 'Microsoft YaHei', 'Segoe UI', 'PingFang SC', sans-serif;
    background-color: var(--bg-space-dark);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: var(--text-white);
    overflow: hidden;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==================== 字体类 ==================== */
.font-mono {
    font-family: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ==================== 背景效果 ==================== */

/* 动态星空背景 */
.stars-overlay {
    position: fixed;
    inset: 0;
    background-image: 
        radial-gradient(white 1px, transparent 0),
        radial-gradient(white 1.5px, transparent 0);
    background-size: 60px 60px, 120px 120px;
    background-position: 0 0, 30px 30px;
    opacity: 0.1;
    z-index: 0;
    pointer-events: none;
    will-change: transform;
}

/* 旋转轨道 */
.orbit-ring {
    position: absolute;
    border: 1px dashed var(--border-cyan-secondary);
    border-radius: 50%;
    animation: rotate var(--duration-orbit) linear infinite;
    will-change: transform;
    pointer-events: none;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* ==================== 卡片样式 ==================== */

/* 科技感卡片 */
.tech-card {
    background: rgba(27, 38, 59, 0.4);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-cyan-primary);
    box-shadow: var(--shadow-card);
    will-change: transform;
}

/* 扫描动画效果 */
.scanner::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(transparent, rgba(34, 211, 238, 0.05), transparent);
    height: 20%;
    width: 100%;
    animation: scan 4s linear infinite;
    z-index: 5;
    pointer-events: none;
    will-change: top;
}

@keyframes scan {
    0% {
        top: -20%;
    }
    100% {
        top: 120%;
    }
}

/* 慢速旋转 */
.animate-spin-slow {
    animation: rotate var(--duration-pulse) linear infinite;
    will-change: transform;
}

/* ==================== 按钮样式 ==================== */

/* 主按钮 */
.btn-primary {
    background: linear-gradient(135deg, var(--color-cyan-secondary) 0%, var(--color-blue-secondary) 100%);
    will-change: transform, background;
    transition: all var(--duration-normal) var(--ease-in-out);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-cyan-primary) 0%, var(--color-blue-primary) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-button);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0) scale(0.98);
}

.btn-primary:disabled {
    background: rgba(59, 130, 246, 0.3);
    cursor: not-allowed;
    opacity: 0.6;
    will-change: auto;
}

/* ==================== 弹窗动画 ==================== */

/* 淡入动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.animate-fade-in {
    animation: fadeIn var(--duration-normal) var(--ease-out);
    will-change: opacity;
}

/* 缩放进入动画 */
@keyframes scaleIn {
    from {
        transform: scale(0.9);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

.animate-scale-in {
    animation: scaleIn var(--duration-normal) var(--ease-out);
    will-change: transform, opacity;
}

/* ==================== 消息提示 ==================== */

.message-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
    will-change: opacity, transform;
}

.message-success {
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #86efac;
    will-change: opacity, transform;
}

/* ==================== 加载动画 ==================== */

@keyframes pulse-ring {
    0% {
        transform: scale(0.8);
        opacity: 1;
    }
    100% {
        transform: scale(1.3);
        opacity: 0;
    }
}

.pulse-ring {
    animation: pulse-ring 1.5s var(--ease-out) infinite;
    will-change: transform, opacity;
}

/* ==================== 响应式设计 ==================== */

/* 小屏幕设备 */
@media (max-width: 480px) {
    body {
        padding: 16px;
    }
    
    .tech-card {
        border-radius: 1rem;
    }
}

/* 中等屏幕设备 */
@media (min-width: 481px) and (max-width: 768px) {
    body {
        padding: 24px;
    }
}

/* 大屏幕设备 */
@media (min-width: 769px) {
    body {
        padding: 32px;
    }
}

/* ==================== 性能优化 ==================== */

/* 减少重绘 */
.tech-card,
.orbit-ring,
.scanner::after,
.animate-spin-slow {
    backface-visibility: hidden;
    perspective: 1000px;
}

/* GPU加速 */
.stars-overlay,
.orbit-ring,
.animate-spin-slow,
.animate-scale-in {
    transform: translateZ(0);
}

/* 优化图片渲染 */
img {
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

/* ==================== 辅助功能 ==================== */

/* 焦点可见性 - 改进对比度 */
:focus-visible {
    outline: 2px solid var(--color-cyan-primary);
    outline-offset: 2px;
}

/* 减少动画 - 用户偏好设置 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 深色模式优化 */
@media (prefers-color-scheme: dark) {
    :root {
        --color-cyan-primary: #22d3ee;
        --bg-space-dark: #0d1b2a;
    }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
    .tech-card {
        border: 2px solid var(--color-cyan-primary);
    }
    
    .btn-primary {
        border: 2px solid var(--text-white);
    }
}