style.css

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    color: #343a40;
    line-height: 1.6;
    padding: 20px;
    min-height: 100vh;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background: white;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    padding: 25px;
    position: relative;
    overflow: hidden;
}

.container::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #4e54c8, #8f94fb);
}

h1 {
    font-size: 24px;
    text-align: center;
    margin: 15px 0 25px;
    color: #2c3e50;
    position: relative;
    padding-bottom: 10px;
}

h1::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, #4e54c8, #8f94fb);
    border-radius: 2px;
}

.radio-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 20px;
}

.radio-group label {
    flex: 1 1 120px;
    display: flex;
    align-items: center;
    gap: 8px;
    background: #f8f9fa;
    padding: 12px 15px;
    border-radius: 8px;
    cursor: pointer;
    border: 1px solid #e1e5eb;
    transition: all 0.3s ease;
    font-weight: 500;
}

.radio-group label:hover {
    background: #e9ecef;
    border-color: #ced4da;
}

.radio-group label input[type="radio"] {
    accent-color: #4e54c8;
}

.input-panel {
    display: none;
    margin-bottom: 20px;
}

.input-panel.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

input[type=file],
input[type=url],
textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #e1e5eb;
    border-radius: 8px;
    font-size: 15px;
    background: #f8f9fa;
    transition: border-color 0.3s;
}

input[type=file]:focus,
input[type=url]:focus,
textarea:focus {
    outline: none;
    border-color: #8f94fb;
    box-shadow: 0 0 0 3px rgba(143, 148, 251, 0.2);
}

textarea {
    min-height: 150px;
    resize: vertical;
    font-family: Consolas, Monaco, monospace;
    line-height: 1.5;
}

button {
    background: linear-gradient(90deg, #4e54c8, #8f94fb);
    color: white;
    font-size: 16px;
    font-weight: 600;
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 15px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 10px rgba(78, 84, 200, 0.3);
    display: block;
    width: 100%;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 15px rgba(78, 84, 200, 0.4);
}

button:active {
    transform: translateY(0);
}

.error {
    background: #ffebee;
    color: #d32f2f;
    padding: 15px;
    border-radius: 8px;
    margin: 15px 0;
    font-size: 15px;
    border-left: 4px solid #d32f2f;
    display: none;
}

.loading {
    text-align: center;
    padding: 20px;
    font-size: 16px;
    color: #6c757d;
    display: none;
}

.loading::after {
    content: "";
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(78, 84, 200, 0.3);
    border-radius: 50%;
    border-top-color: #4e54c8;
    animation: spin 1s ease-in-out infinite;
    margin-left: 10px;
    vertical-align: middle;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.output-section {
    margin-top: 25px;
    display: none;
}

.output-section h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: #2c3e50;
    padding-bottom: 8px;
    border-bottom: 2px solid #e1e5eb;
}

/* 树形结构样式 */
.json-tree {
    font-family: Consolas, Monaco, monospace;
    font-size: 14px;
    line-height: 1.5;
    padding: 15px;
    background: #f8fafc;
    border-radius: 8px;
    border: 1px solid #e1e5eb;
    white-space: nowrap;
    overflow-x: auto;
    max-width: 100%;
}

.tree-node-content {
    display: inline-flex;
    /* 不换行 */
    align-items: center;
    gap: 5px;
}

.tree-node {
    position: relative;
}

.tree-node::before {
    content: "";
    position: absolute;
    top: 12px;
    left: 0;
    width: 10px;
    height: 1px;
    background: #94a3b8;
}

.tree-node::after {
    content: "";
    position: absolute;
    top: 12px;
    left: 0;
    width: 1px;
    height: calc(100% - 12px);
    background: #94a3b8;
}

.tree-node:last-child::after {
    height: 12px;
}

.tree-node-content {
    display: flex;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 5px;
}

.toggle {
    display: inline-block;
    width: 18px;
    height: 18px;
    text-align: center;
    line-height: 18px;
    background: #e2e8f0;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    font-weight: bold;
    color: #4e54c8;
    margin-right: 5px;
    border: 1px solid #cbd5e1;
    -webkit-user-select: none;
    user-select: none;
}

.toggle:hover {
    background: #4e54c8;
    color: white;
}

.tree-key {
    color: #4e54c8;
    font-weight: 600;
}

.tree-colon {
    color: #94a3b8;
}

.tree-value {
    word-break: keep-all;
    /* 防止断字 */
}

.tree-type {
    font-size: 12px;
    color: #64748b;
    background: #f1f5f9;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: 8px;
}

.tree-path {
    font-size: 12px;
    color: #94a3b8;
    margin-left: 10px;
    word-break: break-all;
}

.tree-children {
    padding-left: 20px;
    margin-left: 10px;
    border-left: 1px dashed #cbd5e1;
    display: none;
}

.tree-node.expanded>.tree-children {
    display: block;
}

/* 类型颜色 */
.type-string {
    color: #2e7d32;
}

.type-number {
    color: #1565c0;
}

.type-boolean {
    color: #7b1fa2;
}

.type-null {
    color: #c62828;
}

.type-object {
    color: #d35400;
}

.type-array {
    color: #00796b;
}

/* 复制按钮默认隐藏 */
.copy-btn {
    all: unset;
    cursor: pointer;
    margin-left: 8px;
    font-size: 12px;
    opacity: 0;
    transition: opacity .2s;
}

/* 悬停时显示 */
.tree-node:hover .copy-btn {
    opacity: 1;
}

.input-search {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #e1e5eb;
    border-radius: 6px;
    font-size: 14px;
}

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

    .radio-group label {
        flex: 1 1 100%;
    }

    button {
        padding: 12px 20px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    h1 {
        font-size: 20px;
    }

    input[type=file],
    input[type=url],
    textarea {
        padding: 10px 12px;
        font-size: 14px;
    }

    .tree-node-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 2px;
    }

    .tree-path {
        margin-left: 0;
        margin-top: 3px;
        display: block;
        width: 100%;
    } }