/* ============================================
   全局按钮样式 - Global Button Styles
   精简版 - 仅保留项目中实际使用的样式
   ============================================ */

/* 基础按钮样式 - Base Button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-primary, sans-serif);
    font-size: var(--font-base, 1rem);
    font-weight: var(--font-medium, 500);
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 2px solid transparent;
    border-radius: var(--radius-md, 8px);
    transition: all var(--transition-base, 0.3s ease);
    outline: none;
    position: relative;
    overflow: hidden;
}

.btn:focus-visible {
    outline: 2px solid var(--primary-color, #008B8B);
    outline-offset: 2px;
}

.btn:disabled,
.btn.disabled {
    opacity: 0.6;
    cursor: not-allowed;
    pointer-events: none;
}

/* 主要按钮 - Primary Button */
.btn-primary {
    background: var(--primary-color, #008B8B);
    color: var(--bg-white, #ffffff);
    border-color: var(--primary-color, #008B8B);
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover, #006B6B);
    border-color: var(--primary-hover, #006B6B);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md, 0 4px 16px rgba(0,0,0,0.06));
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: var(--shadow-sm, 0 2px 8px rgba(0,0,0,0.04));
}

/* 轮廓按钮 - Outline Button */
.btn-outline {
    background: transparent;
    color: var(--text-dark, #2d3748);
    border-color: var(--border-color, #e2e8f0);
}

.btn-outline:hover:not(:disabled) {
    background: var(--bg-light, #f7fafc);
    border-color: var(--border-dark, #cbd5e0);
    transform: translateY(-2px);
}

.btn-outline:active:not(:disabled) {
    transform: translateY(0);
}

/* 按钮尺寸 - Button Sizes */
.btn-lg {
    padding: 1rem 2rem;
    font-size: var(--font-lg, 1.125rem);
    border-radius: var(--radius-lg, 16px);
}

/* 带图标的按钮 - Button with Icon */
.btn i,
.btn svg {
    width: 1.25em;
    height: 1.25em;
    flex-shrink: 0;
}

/* 响应式调整 - Responsive */
@media (max-width: 768px) {
    .btn {
        padding: 0.625rem 1.25rem;
        font-size: var(--font-sm, 0.875rem);
    }
    
    .btn-lg {
        padding: 0.875rem 1.75rem;
        font-size: var(--font-base, 1rem);
    }
}

/* 深色模式支持 - Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .btn-outline {
        color: var(--bg-white, #ffffff);
        border-color: var(--border-color, #4a5568);
    }
    
    .btn-outline:hover:not(:disabled) {
        background: var(--bg-gray, #2d3748);
    }
}

/* 打印样式 - Print Styles */
@media print {
    .btn {
        border: 1px solid #000;
        box-shadow: none;
    }
}