:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --success-color: #059669;
    --error-color: #dc2626;
    --background-color: #f8fafc;
    --card-background: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: 'Inter', 'Microsoft YaHei', sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: 2rem;
    background-image: 
        radial-gradient(at 0% 0%, rgba(79, 70, 229, 0.08) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(5, 150, 105, 0.08) 0px, transparent 50%);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem;
    background-color: var(--card-background);
    border-radius: 2rem;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

h1 {
    font-size: 2.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
    position: relative;
    padding-bottom: 1.5rem;
    background: linear-gradient(to right, var(--primary-color), var(--success-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

h1::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--primary-color), var(--success-color));
    border-radius: 2px;
}

.sites-grid {
    display: grid;
    gap: 2.5rem;
}

.site-card {
    background-color: var(--card-background);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 2rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.site-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(79, 70, 229, 0.03), transparent);
    transform: translateX(-100%);
    transition: transform 0.8s;
}

.site-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(79, 70, 229, 0.2);
}

.site-card:hover::before {
    transform: translateX(100%);
}

.site-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.site-info {
    display: flex;
    flex-direction: column;
}

.site-url {
    font-weight: 500;
    color: var(--primary-color);
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: color 0.3s ease;
}

.site-url::before {
    content: '🌐';
    font-size: 1.5rem;
}

.site-url:hover {
    color: var(--primary-hover);
}

.site-title {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-top: 0.25rem;
}

.status {
    padding: 0.75rem 1.5rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.3s ease;
    letter-spacing: 0.025em;
}

.status::before {
    content: '';
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: currentColor;
    box-shadow: 0 0 0 3px currentColor;
    opacity: 0.2;
}

.online {
    background-color: rgba(5, 150, 105, 0.1);
    color: var(--success-color);
}

.offline {
    background-color: rgba(220, 38, 38, 0.1);
    color: var(--error-color);
}

.response-time {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin: 1.25rem 0;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
}

.response-time::before {
    content: '⏱️';
    font-size: 1.125rem;
}

.check-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    position: relative;
    overflow: hidden;
    font-size: 1rem;
    letter-spacing: 0.025em;
}

.check-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transform: translateX(-100%);
    transition: transform 0.8s;
}

.check-button:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.check-button:hover::before {
    transform: translateX(100%);
}

.check-button:active {
    transform: translateY(0);
}

.loading {
    display: none;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.875rem;
}