/* 通用布局 */
* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: "Microsoft YaHei", Arial, sans-serif;
    background: #f6f7fb;
    color: #333;
}

/* 顶部导航 */
.header {
    background: #ffffff;
    border-bottom: 1px solid #e5e5e5;
    padding: 12px 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.header-title {
    font-size: 20px;
    font-weight: bold;
}
.header-nav a {
    margin-left: 15px;
    font-size: 14px;
    color: #555;
    text-decoration: none;
}
.header-nav a:hover {
    color: #1a73e8;
}

/* 主容器 */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 10px 20px 50px;
}

/* Hero 区域 */
.hero {
    text-align: center;
    padding: 50px 10px 20px;
}
.hero h1 {
    font-size: 32px;
    margin-bottom: 6px;
}
.hero p {
    font-size: 16px;
    color: #666;
}

/* 工具网格 */
.section-title {
    font-size: 20px;
    font-weight: bold;
    margin: 30px 0 10px;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 18px;
}

.tool-card {
    background: #fff;
    padding: 18px 18px 14px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    border: 1px solid #eee;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    transition: all 0.18s ease;
}
.tool-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 18px rgba(0,0,0,0.12);
}
.tool-card-title {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 4px;
}
.tool-card-desc {
    font-size: 13px;
    color: #666;
}

/* 工具页布局 */
.tool-page {
    max-width: 900px;
    margin: 30px auto 50px;
    background: #fff;
    padding: 25px 20px 30px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.tool-page h1 {
    font-size: 24px;
    margin-top: 0;
}
.tool-page p {
    font-size: 14px;
    color: #555;
}

label {
    font-size: 14px;
    display: block;
    margin: 10px 0 5px;
}
input[type="text"],
input[type="number"],
textarea,
select {
    width: 100%;
    padding: 8px 10px;
    border-radius: 6px;
    border: 1px solid #ccc;
    font-size: 14px;
    font-family: inherit;
}
textarea {
    min-height: 140px;
    resize: vertical;
}

button {
    padding: 8px 16px;
    margin-top: 10px;
    border-radius: 6px;
    border: none;
    background: #1a73e8;
    color: #fff;
    font-size: 14px;
    cursor: pointer;
}
button:hover {
    background: #1665c1;
}

/* 结果区域 */
.result-box {
    margin-top: 15px;
    padding: 10px;
    background: #f3f4f7;
    border-radius: 6px;
    font-size: 13px;
    white-space: pre-wrap;
    word-break: break-all;
}

/* 页脚 */
footer {
    text-align: center;
    padding: 18px;
    font-size: 13px;
    color: #888;
}
footer a {
    color: #1a73e8;
    text-decoration: none;
}

/* 小屏适配 */
@media (max-width: 600px) {
    .header { padding: 10px 16px; }
    .hero { padding: 35px 10px 10px; }
    .hero h1 { font-size: 24px; }
}