:root { --bg: #f5f7fa; --card: #fff; --primary: #2563eb; --text: #1f2937; --muted: #6b7280; --border: #e5e7eb; }
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; padding: 2rem 1rem; }
.container { max-width: 680px; margin: 0 auto; }
h1 { text-align: center; margin-bottom: 1.5rem; }
form { background: var(--card); padding: 1.5rem; border-radius: 12px; box-shadow: 0 1px 3px rgba(0,0,0,0.1); margin-bottom: 2rem; }
input, textarea { width: 100%; padding: 0.75rem; border: 1px solid var(--border); border-radius: 8px; font-size: 1rem; margin-bottom: 0.75rem; font-family: inherit; }
textarea { min-height: 100px; resize: vertical; }
button { background: var(--primary); color: white; border: none; padding: 0.75rem 1.5rem; border-radius: 8px; font-size: 1rem; cursor: pointer; }
button:disabled { opacity: 0.6; cursor: not-allowed; }
#form-status { min-height: 1.5rem; color: var(--muted); margin-top: 0.5rem; }
section { background: var(--card); padding: 1.5rem; border-radius: 12px; box-shadow: 0 1px 3px rgba(0,0,0,0.1); }
h2 { margin-bottom: 1rem; }
.comment-item { padding: 1rem 0; border-bottom: 1px solid var(--border); }
.comment-item:last-child { border-bottom: none; }
.comment-header { display: flex; justify-content: space-between; gap: 1rem; margin-bottom: 0.5rem; flex-wrap: wrap; }
.comment-header strong { color: var(--primary); }
.comment-header span { color: var(--muted); font-size: 0.875rem; }
.comment-content { white-space: pre-wrap; word-break: break-word; }
.empty, .error { color: var(--muted); text-align: center; padding: 1rem 0; }
.error { color: #dc2626; }