a {
    color: var(--link-color);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.8;
    text-decoration: underline;
    text-decoration-thickness: 1px;
}

img.qrcode {
    display: block;
    margin: 2rem auto;
    max-width: 320px;
    width: 80vw;
    border-radius: 12px;
    box-shadow: 0 0 12px rgba(232, 230, 227, 0.3);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        filter: blur(4px);
    }

    to {
        opacity: 1;
        filter: blur(0);
    }
}

@media (max-width: 640px) {
    body {
        padding: 1rem;
    }

    .container {
        padding: 1rem 0;
        font-size: 0.9rem;
        text-indent: 0;
    }
}

/* 404专用样式 */
.container {
    height: 100vh;
    transform: translateY(-5%);
}

.error-number {
    font-size: 8rem;
    font-weight: 800;
    color: var(--link-color);
    margin-bottom: 1rem;
    line-height: 1;
}

.error-title {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.error-description {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

/* 按钮主题变量 */
:root {
    --btn-bg: rgba(255, 255, 255, 0.05);
    --btn-border: rgba(255, 255, 255, 0.1);
    --btn-hover-bg: rgba(255, 255, 255, 0.1);
}

[data-theme="light"] {
    --btn-bg: rgba(0, 0, 0, 0.05);
    --btn-border: rgba(0, 0, 0, 0.1);
    --btn-hover-bg: rgba(0, 0, 0, 0.08);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--btn-bg);
    color: var(--link-color);
    text-decoration: none;
    border-radius: 25px;
    border: 1px solid var(--btn-border);
    transition: var(--theme-transition);
    margin: 0 10px;
    backdrop-filter: blur(10px);
}

.btn:hover {
    transform: translateY(-2px);
    text-decoration: none;
    background: var(--btn-hover-bg);
    border-color: var(--link-color);
    box-shadow: 0 4px 15px rgba(170, 215, 255, 0.2);
}

[data-theme="light"] .btn:hover {
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.2);
}

@media (max-width: 768px) {
    .error-number {
        font-size: 5rem;
    }

    .error-title {
        font-size: 1.5rem;
    }

    .btn {
        margin: 5px;
        font-size: 0.9rem;
    }
}