:root {
    --primary: #6d5efc;
    --primary-dark: #4f3fd6;
    --accent: #00d4ff;
    --grad: linear-gradient(135deg, #6d5efc 0%, #00d4ff 100%);
    --grad-soft: linear-gradient(135deg, rgba(109,94,252,.10), rgba(0,212,255,.10));
    --danger: #ff4d6d;
    --text: #1b1f3b;
    --muted: #7a82a6;
    --bg: #f4f5ff;
    --card: #ffffff;
    --border: #e7e9ff;
    --radius: 14px;
    --shadow: 0 6px 22px rgba(76,63,214,.10);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- 顶部导航（自适应加宽） ---------- */
.topbar {
    background: var(--grad);
    color: #fff;
    box-shadow: 0 4px 18px rgba(109,94,252,.3);
    position: sticky;
    top: 0;
    z-index: 50;
}
.topbar .container {
    width: 94%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 16px;
    display: flex;
    align-items: center;
    height: 60px;
    gap: 18px;
}
.brand { font-weight: 800; font-size: 20px; color: #fff; letter-spacing: .5px; white-space: nowrap; }
.brand:hover { text-decoration: none; }
.topbar .nav { display: flex; gap: 6px; flex: 1; overflow-x: auto; }
.topbar .nav a { color: #fff; padding: 8px 14px; border-radius: 10px; white-space: nowrap; font-weight: 500; }
.topbar .nav a.active, .topbar .nav a:hover { background: rgba(255,255,255,.18); color: #fff; text-decoration: none; }
.top-actions { display: flex; gap: 10px; align-items: center; }
.btn-ghost { color: #fff; border: 1px solid rgba(255,255,255,.5); padding: 7px 14px; border-radius: 10px; font-size: 14px; }
.btn-ghost:hover { background: rgba(255,255,255,.15); text-decoration: none; }
.badge {
    background: #ef4444; color: #fff; border-radius: 999px;
    font-size: 11px; padding: 1px 7px; margin-left: 4px; vertical-align: middle;
}

/* ---------- 自适应容器（左右留白更小） ---------- */
.container {
    width: 94%;
    max-width: 1600px;
    margin: 28px auto;
    padding: 0 16px;
}

/* Hero / Banner */
.hero {
    background: var(--grad);
    color: #fff;
    border-radius: var(--radius);
    padding: 48px 28px;
    margin: 22px 0;
    text-align: center;
}
.hero h1 { margin: 0 0 8px; font-size: 30px; }
.hero p { margin: 0; opacity: .9; }

/* 轮播图（绝对定位叠放，JS 切换 .active） */
.banner {
    position: relative;
    overflow: hidden;
    height: 460px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-top: 22px;
}
.banner .slide {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 30px;
    font-weight: 800;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity .6s ease;
}
.banner .slide.active { opacity: 1; z-index: 1; }
.banner-cap {
    position: absolute; bottom: 16px; left: 20px;
    color: #fff; font-weight: 700; z-index: 2;
    text-shadow: 0 2px 6px rgba(0,0,0,.4);
}
.banner-arrow {
    position: absolute; top: 50%; transform: translateY(-50%);
    background: rgba(0,0,0,.35); color: #fff; border: none; cursor: pointer;
    width: 40px; height: 40px; border-radius: 50%; font-size: 20px; z-index: 3;
}
.banner-arrow.prev { left: 12px; }
.banner-arrow.next { right: 12px; }
.banner-dots { position: absolute; bottom: 14px; right: 20px; display: flex; gap: 8px; z-index: 3; }
.banner-dots span { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,.6); cursor: pointer; }
.banner-dots span.active { background: #fff; }

/* 数据看板 */
.stats { display: flex; gap: 16px; flex-wrap: wrap; margin: 22px 0; }
.stat {
    flex: 1; min-width: 160px;
    background: var(--card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 18px 20px; box-shadow: var(--shadow);
}
.stat .num { font-size: 26px; font-weight: 800; color: var(--primary); }
.stat .label { color: var(--muted); font-size: 14px; margin-top: 4px; }

/* 快捷入口 */
.quick { display: flex; gap: 14px; flex-wrap: wrap; margin: 22px 0; }

/* 通用卡片 */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}
.card.empty { text-align: center; padding: 40px 20px; }
h2 { font-size: 22px; margin: 28px 0 14px; }

/* 商品网格 */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 18px; }
.item {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    position: relative;
    transition: transform .15s, box-shadow .15s;
}
.item:hover { transform: translateY(-4px); box-shadow: 0 16px 34px rgba(109,94,252,.18); }
.item img { width: 100%; aspect-ratio: 3/2; object-fit: cover; background: #eef0f8; }
.item .body { padding: 14px; }
.item .body a { font-weight: 700; }
.item .price { color: var(--danger); font-weight: 800; font-size: 18px; margin-top: 6px; }
.ai-badge {
    position: absolute; top: 10px; right: 10px;
    background: var(--grad); color: #fff; font-size: 12px; font-weight: 800;
    padding: 3px 9px; border-radius: 999px; z-index: 2;
    box-shadow: 0 2px 8px rgba(109,94,252,.4);
}

/* 按钮 */
.btn {
    display: inline-block;
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 10px 18px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: background .15s;
}
.btn:hover { background: var(--primary-dark); text-decoration: none; }
.btn-secondary { background: #fff; color: var(--primary); border: 1px solid var(--border); }
.btn-secondary:hover { background: #f3f3ff; }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #e23b59; }
.btn-sm { padding: 6px 12px; font-size: 13px; }

/* 表单 */
input, textarea, select {
    width: 100%; padding: 10px 12px; margin: 6px 0 14px;
    border: 1px solid var(--border); border-radius: 10px; font-size: 14px; font-family: inherit;
    background: #fff; color: var(--text);
}
textarea { min-height: 110px; resize: vertical; }
label { font-weight: 600; font-size: 14px; }
.muted { color: var(--muted); font-size: 14px; }
.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.pill {
    display: inline-block; font-size: 12px; padding: 3px 10px; border-radius: 999px;
    background: var(--grad-soft); color: var(--primary-dark); font-weight: 600;
}

/* 提示 */
.flash {
    background: #e9f7ef; color: #0f7a3d; border: 1px solid #b9e6c9;
    padding: 10px 14px; border-radius: 10px; margin-bottom: 14px;
}
.flash.error { background: #fdecea; color: #c62828; border-color: #f5c6c0; }

/* 表格 */
table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: var(--radius); overflow: hidden; }
table th, table td { padding: 12px 14px; border-bottom: 1px solid var(--border); text-align: left; }
table th { background: #f7f8ff; color: var(--muted); font-weight: 700; }
table tr:last-child td { border-bottom: none; }

/* 页脚 */
.site-footer {
    margin-top: 40px;
    background: #1b1f3b;
    color: #c9cdf0;
    padding: 28px 0;
    text-align: center;
}
.site-footer a { color: #c9cdf0; }
.site-footer .muted { color: #9aa0c8; }
.footer-inner {
    width: 94%; max-width: 1600px; margin: 0 auto; padding: 0 16px;
    display: flex; flex-direction: column; align-items: center; gap: 6px;
}
.footer-brand { color: #fff; font-weight: 800; font-size: 16px; }
.footer-meta { display: flex; gap: 18px; flex-wrap: wrap; justify-content: center; }
.footer-meta a { color: #c9cdf0; }

/* 帖子内容 */
.post-content { font-size: 15px; line-height: 1.8; white-space: pre-wrap; }

/* 购物车 */
.cart-prod { display: flex; align-items: center; gap: 12px; }
.cart-prod img { width: 60px; height: 60px; border-radius: 8px; object-fit: cover; background: #eef0f8; }
.cart-foot { display: flex; align-items: center; justify-content: space-between; gap: 14px; margin-top: 16px; flex-wrap: wrap; }
.cart-total { font-size: 18px; font-weight: 700; }

/* ---------- 社区帖子（卡片化） ---------- */
.post-list { display: flex; flex-direction: column; gap: 14px; }
.post-card {
    display: flex; gap: 14px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
    box-shadow: var(--shadow);
    transition: transform .15s, box-shadow .15s, border-color .15s;
}
.post-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 14px 30px rgba(109,94,252,.18);
    border-color: rgba(109,94,252,.4);
    text-decoration: none;
}
.post-avatar {
    width: 46px; height: 46px; flex: 0 0 46px; border-radius: 50%;
    color: #fff; font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px;
}
.post-avatar.lg { width: 56px; height: 56px; flex: 0 0 56px; font-size: 22px; }
.post-main { flex: 1; min-width: 0; }
.post-top { display: flex; align-items: center; gap: 8px; }
.post-title { font-weight: 700; color: var(--text); font-size: 15px; }
.post-excerpt {
    color: var(--muted); font-size: 13px; margin: 5px 0;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.post-meta { color: var(--muted); font-size: 12px; display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }

.post-detail { margin-top: 10px; }
.back { display: inline-block; color: var(--muted); font-size: 13px; margin-bottom: 6px; }
.post-detail-head { display: flex; gap: 14px; align-items: center; margin: 16px 0 14px; }
.post-detail-head h2 { margin: 0 0 4px; font-size: 22px; }
.post-detail-img { max-width: 100%; border-radius: 12px; margin-bottom: 12px; }

.reply-list { display: flex; flex-direction: column; gap: 12px; }
.reply-card {
    display: flex; gap: 12px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 14px;
}
.reply-body { flex: 1; min-width: 0; }

/* 话题筛选 */
.topic-filter { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.topic-filter a.pill { background: #eef0f8; color: var(--muted); }
.topic-filter a.pill.active, .topic-filter a.pill:hover { background: var(--primary); color: #fff; text-decoration: none; }

/* 后台设置表单网格（备用） */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 18px; }
.form-grid .full { grid-column: 1 / -1; }

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
    .banner { height: 200px; }
    .banner .slide { font-size: 22px; }
    .product-detail { grid-template-columns: 1fr; }
    .form-grid { grid-template-columns: 1fr; }
    .nav { gap: 2px; }
    .topbar .nav a { padding: 8px 10px; }
    .container { width: 92%; }
    .topbar .container { width: 92%; }
}