/* ============================================
   SAT-DISCOVERY 赛博科技风格主题
   Cyber-Tech Design Theme
   ============================================ */

/* ==================== CSS变量定义 ==================== */
:root {
    /* 背景色系 - 深色渐变 */
    --bg-primary: #0a0e1a;
    --bg-secondary: #0d1117;
    --bg-tertiary: #161b22;
    --bg-black: #000000;
    
    /* 主色调 - 电光蓝 */
    --cyan-bright: #00d4ff;
    --cyan-primary: #0ea5e9;
    --cyan-dark: #06b6d4;
    --cyan-glow: #00d4ff;
    
    /* 霓虹效果色 */
    --neon-blue: #00d4ff;
    --neon-cyan: #00ffff;
    --neon-purple: #a855f7;
    
    /* 文字颜色 */
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-cyan: #67e8f9;
    
    /* 边框颜色 */
    --border-primary: rgba(0, 212, 255, 0.3);
    --border-secondary: rgba(14, 165, 233, 0.2);
    --border-glow: rgba(0, 212, 255, 0.6);
    
    /* 发光效果 */
    --glow-sm: 0 0 5px rgba(0, 212, 255, 0.5);
    --glow-md: 0 0 10px rgba(0, 212, 255, 0.6), 0 0 20px rgba(0, 212, 255, 0.3);
    --glow-lg: 0 0 15px rgba(0, 212, 255, 0.7), 0 0 30px rgba(0, 212, 255, 0.4), 0 0 45px rgba(0, 212, 255, 0.2);
    
    /* 渐变 */
    --gradient-cyber: linear-gradient(135deg, rgba(0, 212, 255, 0.1) 0%, rgba(14, 165, 233, 0.05) 100%);
    --gradient-panel: linear-gradient(180deg, rgba(22, 27, 34, 0.95) 0%, rgba(10, 14, 26, 0.98) 100%);
    
    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* 边框圆角 */
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 8px;
    
    /* 动画时长 */
    --transition-fast: 0.15s;
    --transition-base: 0.3s;
    --transition-slow: 0.5s;
}

/* ==================== 全局样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* 星空背景效果 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(2px 2px at 20% 30%, rgba(0, 212, 255, 0.3), transparent),
        radial-gradient(2px 2px at 60% 70%, rgba(0, 212, 255, 0.2), transparent),
        radial-gradient(1px 1px at 50% 50%, rgba(255, 255, 255, 0.3), transparent),
        radial-gradient(1px 1px at 80% 10%, rgba(255, 255, 255, 0.2), transparent),
        radial-gradient(2px 2px at 90% 60%, rgba(0, 212, 255, 0.2), transparent),
        radial-gradient(1px 1px at 33% 80%, rgba(255, 255, 255, 0.2), transparent),
        radial-gradient(2px 2px at 15% 90%, rgba(0, 212, 255, 0.3), transparent);
    background-size: 200% 200%;
    animation: twinkle 3s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
    opacity: 0.4;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 0.6; }
}

/* 渐变网格背景 */
body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 0;
}

/* ==================== 通用工具类 ==================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    position: relative;
    z-index: 1;
}

/* 发光文字效果 */
.text-glow {
    color: var(--cyan-bright);
    text-shadow: var(--glow-sm);
}

.text-glow-strong {
    color: var(--cyan-bright);
    text-shadow: var(--glow-md);
}

/* 发光边框面板 */
.panel-glow {
    background: var(--gradient-panel);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-primary);
    box-shadow: var(--glow-md), inset 0 0 20px rgba(0, 212, 255, 0.05);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    position: relative;
}

/* 斜角边框效果 */
.panel-angular {
    background: var(--gradient-panel);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-primary);
    clip-path: polygon(
        0 0, 
        calc(100% - 12px) 0, 
        100% 12px, 
        100% 100%, 
        12px 100%, 
        0 calc(100% - 12px)
    );
    padding: var(--spacing-lg);
    position: relative;
}

.panel-angular::before {
    content: '';
    position: absolute;
    top: -1px;
    right: -1px;
    width: 15px;
    height: 15px;
    border-top: 1px solid var(--cyan-bright);
    border-right: 1px solid var(--cyan-bright);
    box-shadow: var(--glow-sm);
}

/* 编号标签 */
.numbered-item {
    position: relative;
    padding-left: var(--spacing-xl);
}

.numbered-item::before {
    content: attr(data-number) ')';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--cyan-bright);
    font-weight: 600;
    font-size: 1.1em;
    text-shadow: var(--glow-sm);
}

/* 半透明面板 */
.panel-transparent {
    background: rgba(22, 27, 34, 0.6);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

/* 细线条分隔 */
.divider-thin {
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        var(--border-primary) 10%,
        var(--cyan-bright) 50%,
        var(--border-primary) 90%,
        transparent 100%
    );
    box-shadow: 0 0 5px rgba(0, 212, 255, 0.3);
    margin: var(--spacing-lg) 0;
}

/* ==================== 标题样式 ==================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: 2.5rem;
    color: var(--text-primary);
    text-shadow: var(--glow-sm);
}

h2 {
    font-size: 2rem;
    color: var(--cyan-bright);
    text-shadow: var(--glow-sm);
}

h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

/* ==================== 链接样式 ==================== */
a {
    color: var(--cyan-primary);
    text-decoration: none;
    transition: all var(--transition-base);
}

a:hover {
    color: var(--cyan-bright);
    text-shadow: var(--glow-sm);
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-block;
    padding: 12px 24px;
    background: transparent;
    border: 1px solid var(--cyan-primary);
    color: var(--cyan-bright);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    border-radius: var(--radius-sm);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.3), transparent);
    transition: left var(--transition-slow);
}

.btn:hover {
    border-color: var(--cyan-bright);
    box-shadow: var(--glow-md);
    color: var(--text-primary);
    background: rgba(0, 212, 255, 0.1);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--cyan-primary);
    border-color: var(--cyan-bright);
    color: var(--bg-primary);
    box-shadow: var(--glow-sm);
}

.btn-primary:hover {
    background: var(--cyan-bright);
    box-shadow: var(--glow-lg);
    transform: translateY(-2px);
}

/* ==================== 卡片样式 ==================== */
.card {
    background: var(--gradient-panel);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
    position: relative;
}

.card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--cyan-bright), transparent);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.card:hover {
    border-color: var(--cyan-bright);
    box-shadow: var(--glow-md);
    transform: translateY(-4px);
}

.card:hover::after {
    opacity: 1;
}

/* ==================== 表单样式 ==================== */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
textarea,
select {
    width: 100%;
    padding: 12px 16px;
    background: rgba(22, 27, 34, 0.5);
    border: 1px solid var(--border-secondary);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all var(--transition-base);
    backdrop-filter: blur(5px);
}

input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--cyan-bright);
    box-shadow: var(--glow-sm);
    background: rgba(22, 27, 34, 0.7);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-muted);
}

/* ==================== 标签样式 ==================== */
.badge {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid var(--border-primary);
    border-radius: 12px;
    color: var(--cyan-bright);
    font-size: 0.875rem;
    font-weight: 500;
}

.badge-glow {
    box-shadow: var(--glow-sm);
    border-color: var(--cyan-bright);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 16px;
        --spacing-xl: 24px;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    
    .panel-angular {
        clip-path: none;
        border-radius: var(--radius-md);
    }
}

/* ==================== 动画效果 ==================== */
@keyframes pulse-glow {
    0%, 100% {
        box-shadow: var(--glow-sm);
    }
    50% {
        box-shadow: var(--glow-md);
    }
}

.animate-pulse-glow {
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes slide-in-right {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.animate-slide-in {
    animation: slide-in-right 0.5s ease-out;
}

/* ==================== 滚动条样式 ==================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--cyan-dark);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--cyan-primary);
    box-shadow: var(--glow-sm);
}