/* style.css */

/* --- 全局与变量 --- */
:root {
    --bg-color: #f4f4f4;
    --content-bg: #ffffff;
    --text-color: #333333;
    --muted-color: #666666;
    --border-color: #e0e0e0;
    --link-color: #0056b3;
    --link-hover-color: #004494;
    --highlight-bg: #f0f8ff;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --content-bg: #2d2d2d;
    --text-color: #c0c0c0;
    --muted-color: #999999;
    --border-color: #404040;
    --link-color: #66b3ff;
    --link-hover-color: #4da6ff;
    --highlight-bg: #333;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px;
}

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

a:hover {
    color: var(--link-hover-color);
}

/* --- Header --- */
.header {
    background-color: var(--content-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--text-color);
}
.header-actions a {
    margin-left: 15px;
}
.btn {
    background-color: var(--link-color);
    color: #fff;
    padding: 8px 15px;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-size: 14px;
}
.btn:hover {
    background-color: var(--link-hover-color);
    color: #fff;
}

/* --- 需求列表页 --- */
.filter-bar {
    background-color: var(--content-bg);
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
    border: 1px solid var(--border-color);
}
.filter-bar input, .filter-bar select {
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--content-bg);
    color: var(--text-color);
}
.demand-list {
    background-color: var(--content-bg);
    border-radius: 5px;
    border: 1px solid var(--border-color);
}
.demand-item {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    transition: background-color 0.2s;
}
.demand-item:last-child {
    border-bottom: none;
}
.demand-item:hover {
    background-color: var(--highlight-bg);
}
.demand-item-title {
    font-size: 16px;
    font-weight: 500;
    flex-grow: 1;
    margin-right: 15px;
}
.demand-item-title a {
    color: var(--text-color);
}
.demand-item-title a:hover {
    color: var(--link-color);
}
.demand-item-meta {
    font-size: 13px;
    color: var(--muted-color);
    display: flex;
    align-items: center;
    gap: 15px;
}
.tag {
    background-color: #e8e8e8;
    color: #666;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 12px;
}
[data-theme="dark"] .tag {
    background-color: #444;
    color: #aaa;
}

/* --- 详情页 --- */
.detail-container {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 20px;
}
.detail-main {
    background-color: var(--content-bg);
    padding: 20px;
    border-radius: 5px;
    border: 1px solid var(--border-color);
}
.detail-sidebar {
    background-color: var(--content-bg);
    padding: 20px;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    height: fit-content;
    position: sticky;
    top: 80px;
}
.detail-sidebar h3 {
    margin-top: 0;
}
.unlock-box {
    text-align: center;
    padding: 20px;
    border: 1px dashed var(--border-color);
    border-radius: 5px;
}
.unlock-btn {
    width: 100%;
    margin-top: 15px;
}

/* --- 发布页 --- */
.post-form {
    background-color: var(--content-bg);
    padding: 20px;
    border-radius: 5px;
    border: 1px solid var(--border-color);
}
.post-form .form-group {
    margin-bottom: 15px;
}
.post-form label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}
.post-form input, .post-form textarea, .post-form select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-sizing: border-box;
    background-color: var(--bg-color);
    color: var(--text-color);
}
.post-form textarea {
    resize: vertical;
}

/* --- 支付弹窗 --- */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}
.modal-content {
    background-color: var(--content-bg);
    margin: 10% auto;
    padding: 20px;
    border: 1px solid var(--border-color);
    width: 400px;
    max-width: 90%;
    text-align: center;
    border-radius: 5px;
}
.modal-content img {
    max-width: 200px;
    margin: 15px 0;
}

/* --- Footer --- */
.footer {
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    font-size: 13px;
    color: var(--muted-color);
    border-top: 1px solid var(--border-color);
}