* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    color: #000;
    font-family: "Georgia", serif;
}

body {
    font-family: 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #a8c0ff, #3f2b96);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.container {
    text-align: center;
    padding: 2rem;
}

.content {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    border: 1px solid rgba(255, 255, 255, 0.18);
    animation: fadeIn 1s ease-out;
}

.title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #000;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.subtitle {
    font-size: 12px;
    line-height: 1.6;
    color: #666;
    margin: 15px 0;
    text-align: justify;
    letter-spacing: 0.5px;
}

.button-container {
    margin-top: 2rem;
}

#checkButton {
    padding: 1rem 2rem;
    font-size: 1.2rem;
    background: linear-gradient(45deg, #2196F3, #00BCD4);
    color: white;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0 auto;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

#checkButton:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
    background: linear-gradient(45deg, #1976D2, #0097A7);
}

#checkButton:active {
    transform: translateY(1px);
}

.button-icon {
    font-size: 1.4rem;
}

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

/* 添加响应式设计 */
@media (max-width: 768px) {
    .content {
        padding: 2rem;
    }
    
    .title {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 10px;
        line-height: 1.5;
        margin: 12px 0;
    }
    
    #checkButton {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
}

.custom-alert {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.custom-alert.show {
    display: flex;
    animation: fadeIn 0.3s ease-out;
}

.alert-content {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    color: #333;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.alert-content p {
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.alert-close {
    padding: 0.5rem 2rem;
    background: #2196F3;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.alert-close:hover {
    background: #1976D2;
    transform: translateY(-2px);
}

.alert-close:active {
    transform: translateY(0);
}

.language-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    min-width: 140px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.language-switcher:hover {
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.lang-toggle {
    width: 100%;
    padding: 12px 16px;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: #333;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.3s ease;
}

.lang-toggle:hover {
    color: #007bff;
}

.toggle-icon {
    font-size: 12px;
    margin-left: 8px;
    transition: transform 0.3s ease;
}

.language-switcher.active .toggle-icon {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 0 0 12px 12px;
    padding: 8px 0;
    margin-top: 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-top: none;
}

.language-switcher.active .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-btn {
    display: flex;
    align-items: center;
    padding: 10px 16px;
    color: #333;
    text-decoration: none;
    transition: all 0.2s ease;
    font-size: 14px;
    gap: 8px;
}

.lang-btn:hover {
    background: rgba(0, 123, 255, 0.1);
    color: #007bff;
}

.lang-btn.active {
    background: rgba(0, 123, 255, 0.15);
    color: #007bff;
    font-weight: 500;
}

@media (max-width: 768px) {
    .language-switcher {
        top: 15px;
        right: 15px;
        min-width: 120px;
    }

    .lang-toggle {
        padding: 10px 12px;
        font-size: 14px;
    }

    .lang-btn {
        padding: 8px 12px;
        font-size: 13px;
    }
}

.note-container {
    margin: 2rem 0;
    perspective: 1000px;
}

.note {
    background: #fff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transform: rotate(-1deg);
    transition: all 0.3s ease;
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.note:hover {
    transform: rotate(0deg) scale(1.02);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.note::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #2196F3, #00BCD4);
    border-radius: 8px 8px 0 0;
}

.note-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px dashed #e0e0e0;
}

.note-icon {
    font-size: 1.5rem;
    margin-right: 0.5rem;
}

.note-title {
    font-size: 1.2rem;
    font-weight: bold;
    color: #2196F3;
}

.subtitle {
    font-size: 0.95rem;
    line-height: 1.6;
    color: #333;
    margin: 0;
    text-align: left;
}

@media (max-width: 768px) {
    .note {
        padding: 1rem;
        margin: 0 1rem;
    }
    
    .note-title {
        font-size: 1.1rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
}

.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 1rem 0;
    background: linear-gradient(to right, 
        rgba(255, 255, 255, 0.95),
        rgba(255, 255, 255, 0.85),
        rgba(255, 255, 255, 0.95)
    );
    backdrop-filter: blur(10px);
    text-align: center;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
    z-index: 1000;
    border-top: 1px solid rgba(33, 150, 243, 0.1);
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right,
        transparent,
        rgba(33, 150, 243, 0.2),
        transparent
    );
}

.footer-text {
    font-size: 0.9rem;
    color: #333;
    margin: 0;
    position: relative;
    display: inline-block;
    padding: 0 1rem;
}

.footer-link {
    color: #2196F3;
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
    padding: 0 0.2rem;
}

.footer-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 1px;
    background: #2196F3;
    transform: scaleX(0);
    transition: transform 0.3s ease;
    transform-origin: right;
}

.footer-link:hover {
    color: #1976D2;
}

.footer-link:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

.footer-separator {
    margin: 0 0.8rem;
    color: #999;
    font-weight: 300;
}

.footer-center {
    color: #666;
    font-weight: 500;
    letter-spacing: 0.5px;
}

@media (max-width: 768px) {
    .footer {
        padding: 0.8rem 0;
        background: linear-gradient(to right, 
            rgba(255, 255, 255, 0.98),
            rgba(255, 255, 255, 0.95),
            rgba(255, 255, 255, 0.98)
        );
    }
    
    .footer-text {
        font-size: 0.8rem;
        padding: 0 0.5rem;
    }
    
    .footer-separator {
        margin: 0 0.5rem;
    }
}