/* 大鹅工具库 llfone.cn - 通用样式 */

/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

/* 主内容区域 */
.main-content {
    min-height: calc(100vh - 150px);
    padding: 20px 0;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 卡片样式 */
.card {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.card-header {
    padding: 20px;
    border-bottom: 1px solid #f0f0f0;
}

.card-body {
    padding: 20px;
}

.card-footer {
    padding: 15px 20px;
    background: #f8f9fa;
    border-top: 1px solid #f0f0f0;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    min-height: 40px;
}

.btn-primary {
    background: linear-gradient(135deg, #2196f3, #1976d2);
    color: #fff;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #1976d2, #1565c0);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

.btn-secondary {
    background: #6c757d;
    color: #fff;
}

.btn-secondary:hover {
    background: #5a6268;
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    border: 2px solid #2196f3;
    color: #2196f3;
}

.btn-outline:hover {
    background: #2196f3;
    color: #fff;
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}

.form-control {
    width: 100%;
    padding: 10px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 14px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: #2196f3;
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

/* 标题样式 */
.page-title {
    font-size: 32px;
    font-weight: 700;
    color: #2c3e50;
    margin-bottom: 20px;
    text-align: center;
}

.section-title {
    font-size: 24px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 15px;
    position: relative;
    padding-left: 20px;
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 20px;
    background: linear-gradient(135deg, #2196f3, #1976d2);
    border-radius: 2px;
}

/* 网格系统 */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: -10px;
}

.col {
    flex: 1;
    padding: 10px;
}

.col-1 { flex: 0 0 8.333333%; }
.col-2 { flex: 0 0 16.666667%; }
.col-3 { flex: 0 0 25%; }
.col-4 { flex: 0 0 33.333333%; }
.col-6 { flex: 0 0 50%; }
.col-8 { flex: 0 0 66.666667%; }
.col-9 { flex: 0 0 75%; }
.col-12 { flex: 0 0 100%; }

/* 加载动画 */
.loading-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 50px 20px;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #2196f3;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 提示框样式 */
.alert {
    padding: 15px 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid transparent;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border-color: #c3e6cb;
}

.alert-warning {
    background: #fff3cd;
    color: #856404;
    border-color: #ffeaa7;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border-color: #f5c6cb;
}

/* 工具类 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-10 { margin-top: 10px; }
.mt-20 { margin-top: 20px; }
.mt-30 { margin-top: 30px; }

.mb-10 { margin-bottom: 10px; }
.mb-20 { margin-bottom: 20px; }
.mb-30 { margin-bottom: 30px; }

.ml-10 { margin-left: 10px; }
.mr-10 { margin-right: 10px; }

.p-10 { padding: 10px; }
.p-20 { padding: 20px; }
.p-30 { padding: 30px; }

.pt-10 { padding-top: 10px; }
.pb-10 { padding-bottom: 10px; }
.pl-10 { padding-left: 10px; }
.pr-10 { padding-right: 10px; }

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .page-title {
        font-size: 28px;
    }

    .section-title {
        font-size: 20px;
    }

    .row {
        margin: -5px;
    }

    .col {
        padding: 5px;
    }
}

@media (max-width: 480px) {
    .page-title {
        font-size: 24px;
    }

    .section-title {
        font-size: 18px;
    }

    .btn {
        padding: 8px 16px;
        font-size: 13px;
    }
}

/* 动画效果 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #c1c1c1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 9999;
    background: linear-gradient(135deg, #2196f3, #1976d2);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.8);
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    box-shadow: 0 4px 20px rgba(33, 150, 243, 0.3);
    backdrop-filter: blur(10px);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.back-to-top:hover {
    background: linear-gradient(135deg, #1976d2, #1565c0);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 30px rgba(33, 150, 243, 0.4);
}

.back-to-top:active {
    transform: translateY(-1px) scale(0.98);
    transition: all 0.1s ease;
}

.back-to-top i {
    font-size: 20px;
    margin-bottom: 2px;
    transition: transform 0.3s ease;
}

.back-to-top:hover i {
    transform: translateY(-2px);
}

.back-to-top-text {
    font-size: 10px;
    font-weight: 500;
    opacity: 0.9;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 1px;
}

/* 移动端优化 */
@media (max-width: 768px) {
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 48px;
        height: 48px;
    }

    .back-to-top i {
        font-size: 18px;
    }

    .back-to-top-text {
        font-size: 9px;
    }
}

@media (max-width: 480px) {
    .back-to-top {
        bottom: 15px;
        right: 15px;
        width: 44px;
        height: 44px;
    }

    .back-to-top i {
        font-size: 16px;
        margin-bottom: 1px;
    }

    .back-to-top-text {
        font-size: 8px;
    }
}

/* 确保返回顶部按钮始终在最前面 */
.back-to-top {
    z-index: 10000;
}

/* 深色主题支持 */
@media (prefers-color-scheme: dark) {
    .back-to-top {
        background: linear-gradient(135deg, #1976d2, #1565c0);
        box-shadow: 0 4px 20px rgba(25, 118, 210, 0.4);
    }

    .back-to-top:hover {
        background: linear-gradient(135deg, #1565c0, #0d47a1);
        box-shadow: 0 8px 30px rgba(25, 118, 210, 0.5);
    }
}

/* 无障碍支持 */
@media (prefers-reduced-motion: reduce) {
    .back-to-top {
        transition: opacity 0.3s ease, transform 0.3s ease;
    }

    .back-to-top i {
        transition: none;
    }
}

.back-to-top:focus {
    outline: 2px solid #fff;
    outline-offset: 2px;
}