* {
    box-sizing: border-box;
}

body {
    margin: 0;
    color: #222;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
        "PingFang SC", "Microsoft YaHei", sans-serif;
    line-height: 1.8;
}

.container {
    max-width: 860px;
    margin: 48px auto;
    padding: 0 16px 32px 16px;
}

.article {
    background: #fff;
    border: 1px solid #e8e8e8;
    border-radius: 18px;
    padding: 42px;
    box-shadow: 0 6px 18px rgba(0,0,0,.04);
}

h1 {
    margin: 0;
    font-size: 2.4rem;
    line-height: 1.2;
}

.meta {
    margin-top: 16px;
    color: #888;
    font-size: 14px;
}

.ai-card {
    margin: 36px 0 14px;
    background: linear-gradient(#fafcff,#f6f8ff);
    border: 1px solid #d7e3ff;
    border-radius: 16px;
    overflow: hidden;
}

.ai-card-header {
    padding: 14px 20px;
    background: #edf3ff;
    color: #3663d6;
    font-weight: 700;
    border-bottom: 1px solid #d7e3ff;
}

.ai-card-body {
    padding: 20px;
}

.ai-card-body ul {
    margin: 14px 0 0 18px;
}

.detect-card {
    margin-bottom: 36px;
    border: 1px solid #ffe2b4;
    background: #fffaf2;
    border-radius: 14px;
    padding: 18px 20px;
}

.detect-title {
    font-size: 15px;
    font-weight: 600;
    color: #995f00;
}

.detect-rate {
    margin-top: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column-reverse;
}

.rate-value {
    color: #d12b2b;
    font-size: 28px;
    font-weight: bold;
}

.tag {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    background: #ffe0e0;
    color: #c52424;
    font-size: 13px;
    font-weight: 600;
}

p {
    margin: 1.3em 0;
    color: #333;
}

h2 {
    margin-top: 40px;
    font-size: 22px;
}

.comments {
    margin-top: 40px;
    border-top: 1px solid #ececec;
    padding-top: 32px;
}

.comments h3 {
    margin: 0 0 18px;
    font-size: 22px;
}

textarea {
    width: 100%;
    padding: 16px;
    border-radius: 12px;
    border: 1px solid #d8d8d8;
    resize: vertical;
    font: inherit;
    background: #fff;
}

#reply-textarea {
    min-height: 120px;
}

.actions {
    margin-top: 16px;
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

button {
    border: none;
    border-radius: 10px;
    padding: 12px 22px;
    font-size: 15px;
    cursor: pointer;
}

.send {
    background: #3b82f6;
    color: white;
}

.ai-reply {
    background: #eef3ff;
    color: #2b5ec7;
    border: 1px solid #c9d9ff;
}