:root {
    --bg-gradient-start: #1a1a2e;
    --bg-gradient-end: #0f3460;
    --accent-color1: #ff7e5f;
    --accent-color2: #feb47b;
    --card-bg: rgba(255, 255, 255, 0.1);
    --card-border: rgba(255, 255, 255, 0.2);
    --card-shadow: rgba(0, 0, 0, 0.3);
    --text-primary: rgba(255, 255, 255, 0.9);
    --text-secondary: rgba(255, 255, 255, 0.7);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--bg-gradient-start), var(--bg-gradient-end));
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    position: relative;
}

.particle-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

#particle-canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.container {
    max-width: 1200px;
    width: 90%;
    margin: 2rem auto;
    z-index: 1;
    animation: fadeIn 1s ease-in-out;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: linear-gradient(to right, var(--accent-color1), var(--accent-color2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.cards-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
}

.card {
    width: 100%;
    max-width: 300px;
    background: var(--card-bg);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    box-shadow: 0 10px 25px var(--card-shadow);
    position: relative;
    overflow: hidden;
    transition: all 0.4s ease;
    cursor: pointer;
    justify-self: center;
}

.card:hover {
    transform: translateY(-15px) scale(1.03);
    box-shadow: 0 15px 35px var(--card-shadow);
    z-index: 10;
}

.card-highlight {
    position: absolute;
    top: 0;
    left: 0;
    height: 5px;
    width: 0;
    background: linear-gradient(to right, var(--accent-color1), var(--accent-color2));
    transition: width 0.4s ease;
}

.card:hover .card-highlight {
    width: 100%;
}

.card-content {
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--accent-color1);
    transition: transform 0.3s ease;
}

.card:hover .card-icon {
    transform: scale(1.1);
    color: var(--accent-color2);
}

.card h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    background: linear-gradient(to right, var(--accent-color1), var(--accent-color2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.card p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.card-button {
    padding: 0.8rem 1.5rem;
    background: linear-gradient(to right, var(--accent-color1), var(--accent-color2));
    border: none;
    border-radius: 50px;
    color: white;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
}

.card-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

.card-button:active {
    transform: translateY(2px);
}

/* 波纹效果 */
.ripple {
    position: absolute;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 50%;
    transform: scale(0);
    animation: ripple 0.6s linear;
    pointer-events: none;
}

@keyframes ripple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

footer {
    text-align: center;
    margin-top: 3rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式布局 */
@media (max-width: 768px) {
    .cards-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    header p {
        font-size: 1rem;
    }
    
    .card {
        max-width: 100%;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .cards-container {
        grid-template-columns: repeat(2, 1fr);
    }
}

.time-display {
    margin-top: 1rem;
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 500;
    letter-spacing: 0.5px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    display: inline-block;
}

.time-display p {
    margin: 0;
}

.time-display span {
    color: var(--accent-color1);
    font-family: 'Courier New', monospace;
    font-weight: bold;
}