.clock-card {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.3s ease;
    text-align: center;
}

.clock-card:hover {
    transform: translateY(-5px);
}

.title {
    text-align: center;
    margin-bottom: 40px;
    color: #fff;
    font-size: clamp(24px, 3vw, 44px);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.title i {
    color: #4dabf7;
}

.time-display {
    font-size: clamp(4rem, 10vw, 9rem);
    font-weight: 300;
    letter-spacing: 3px;
    margin-bottom: 20px;
    text-shadow: 0 0 15px rgba(77, 171, 247, 0.5);
}

.time-colon {
    animation: pulse 1s infinite;
}

.date-display {
    font-size: clamp(1.6rem, 2.8vw, 3rem);
    margin-bottom: 30px;
    color: #e9ecef;
    text-align: center;
}

.week-display {
    font-size: clamp(1.2rem, 2vw, 2rem);
    color: #a5d8ff;
    padding: 12px 30px;
    background: rgba(77, 171, 247, 0.15);
    border-radius: 50px;
    display: inline-block;
    margin-bottom: 30px;
    user-select: none;
}

.timezone {
    font-size: 1.2rem;
    color: #adb5bd;
    text-align: center;
    margin-top: 15px;
}

.utc-display {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 1.1rem;
    color: #a5d8ff;
    background: rgba(77, 171, 247, 0.12);
    border: 1px solid rgba(77, 171, 247, 0.25);
    border-radius: 50px;
    padding: 8px 14px;
    margin-top: 10px;
}

.utc-display i { color: #4dabf7; }

/* 冒号闪烁动画 */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}