* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: #f5f7fb;
    color: #1f2d3d;
    line-height: 1.5;
    padding: 20px;
}
.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    padding: 20px 24px 32px;
}
header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    flex-wrap: wrap;
    border-bottom: 1px solid #e4e7ed;
    padding-bottom: 16px;
    margin-bottom: 24px;
}
h1 {
    font-size: 1.8rem;
    color: #2c3e50;
}
.admin-link a {
    text-decoration: none;
    color: #409eff;
    font-size: 0.9rem;
}
.post-form {
    background: #f9fafc;
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 28px;
    border: 1px solid #e4e7ed;
}
.post-form h3 {
    margin-bottom: 12px;
}
input, textarea {
    width: 100%;
    padding: 10px 12px;
    margin-bottom: 12px;
    border: 1px solid #dcdfe6;
    border-radius: 8px;
    font-size: 0.9rem;
}
button {
    background-color: #409eff;
    color: white;
    border: none;
    padding: 8px 20px;
    border-radius: 20px;
    cursor: pointer;
}
button:hover {
    background-color: #66b1ff;
}
.comments-list h3 {
    margin-bottom: 16px;
}
.comment {
    border-bottom: 1px solid #ebeef5;
    padding: 16px 0;
}
.comment-header {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 10px;
    margin-bottom: 8px;
}
.nickname {
    font-weight: 600;
    color: #2c3e50;
}
.time {
    color: #909399;
    font-size: 0.75rem;
}
.comment-content {
    margin-top: 6px;
    padding-left: 8px;
    border-left: 3px solid #e4e7ed;
    word-break: break-word;
}
.empty {
    text-align: center;
    color: #909399;
    padding: 40px 0;
}
.error-msg {
    background: #fef0f0;
    color: #f56c6c;
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 16px;
}
@media (max-width: 640px) {
    .container { padding: 16px; }
}