/* =========================================================================
   assets/css/style.css
   作用：全站样式，三套主题通过 CSS 变量切换（body.theme-green / .theme-mint / .theme-forest）。
        默认主题为绿色（草方块感），另含薄荷绿（明亮）与深林绿（暗色）。
   ========================================================================= */

/* ---------- 主题：绿色（默认）---------- */
body.theme-green {
    --bg: #f0f4ee;
    --bg-alt: #e3ecd9;
    --surface: #ffffff;
    --surface-2: #f7faf3;
    --text: #2c3a26;
    --text-muted: #6a7c5c;
    --primary: #4caf50;
    --primary-dark: #2f7d32;
    --primary-light: #81c784;
    --accent: #ffca28;
    --border: #cfd8c5;
    --danger: #d32f2f;
    --shadow: 0 8px 24px rgba(60, 90, 40, .08);
    --header-grad: linear-gradient(135deg, #4caf50 0%, #2f7d32 100%);
}

/* ---------- 主题：薄荷绿（明亮）---------- */
body.theme-mint {
    --bg: #eafaf2;
    --bg-alt: #d4f1e2;
    --surface: #ffffff;
    --surface-2: #f4fdf8;
    --text: #1d3a2b;
    --text-muted: #5b8772;
    --primary: #26c281;
    --primary-dark: #159a66;
    --primary-light: #7fe3bb;
    --accent: #00bcd4;
    --border: #c4e8d6;
    --danger: #c62828;
    --shadow: 0 8px 24px rgba(38, 194, 129, .12);
    --header-grad: linear-gradient(135deg, #26c281 0%, #00bcd4 100%);
}

/* ---------- 主题：深林绿（暗色）---------- */
body.theme-forest {
    --bg: #0f1e16;
    --bg-alt: #152a1f;
    --surface: #1d3527;
    --surface-2: #234031;
    --text: #e8f0e0;
    --text-muted: #9bb59b;
    --primary: #5cba6a;
    --primary-dark: #3a8a4a;
    --primary-light: #88d996;
    --accent: #c8e668;
    --border: #34503e;
    --danger: #ef5350;
    --shadow: 0 8px 24px rgba(0, 0, 0, .35);
    --header-grad: linear-gradient(135deg, #2c5538 0%, #0f1e16 100%);
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: "Segoe UI", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background .25s, color .25s;
}
a { color: var(--primary-dark); text-decoration: none; }
a:hover { color: var(--primary); }
h1, h2, h3, h4 { color: var(--primary-dark); margin: 0 0 .5em; line-height: 1.25; }
img { max-width: 100%; display: block; }

.container { max-width: 1100px; margin: 0 auto; padding: 0 18px; }

/* ---------- 顶部导航 ---------- */
.topbar {
    background: var(--surface);
    border-bottom: 3px solid var(--primary);
    box-shadow: var(--shadow);
    position: sticky; top: 0; z-index: 100;
}
.topbar-inner { display: flex; align-items: center; justify-content: space-between; min-height: 60px; flex-wrap: wrap; }
.brand {
    display: flex; align-items: center; gap: 8px;
    font-size: 20px; font-weight: 800;
    color: var(--primary-dark);
}
.brand-icon { font-size: 24px; }
.navbar { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.navbar a {
    padding: 8px 12px; border-radius: 6px; color: var(--text);
    font-weight: 600; transition: background .15s, color .15s;
}
.navbar a:hover { background: var(--bg-alt); color: var(--primary-dark); }
.navbar a.nav-admin { background: var(--accent); color: #2c2c00; }
.badge-dot {
    display: inline-block; min-width: 18px; padding: 0 5px; height: 18px;
    line-height: 18px; text-align: center; border-radius: 9px;
    background: var(--danger); color: #fff; font-size: 11px; font-weight: 700;
    margin-left: 4px;
}
.nav-toggle {
    display: none; background: var(--primary); color: #fff;
    border: 0; border-radius: 6px; padding: 6px 12px; font-size: 18px; cursor: pointer;
}
@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .navbar { width: 100%; flex-direction: column; align-items: stretch; display: none; }
    body.nav-open .navbar { display: flex; }
}

/* ---------- 按钮 ---------- */
.btn, .btn-primary, .btn-ghost, .btn-danger {
    display: inline-block; padding: 9px 18px; border-radius: 6px;
    border: 0; cursor: pointer; font-size: 14px; font-weight: 600;
    text-decoration: none; transition: filter .15s, background .15s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-ghost:hover { background: var(--bg-alt); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { filter: brightness(.92); }
.btn { background: var(--primary); color: #fff; }
.btn:hover { background: var(--primary-dark); color: #fff; }

/* ---------- 站点头 ---------- */
.site-header {
    background: var(--header-grad);
    color: #fff;
    padding: 38px 0 28px;
    border-bottom: 4px solid var(--accent);
}
.site-title { color: #fff; font-size: 28px; margin: 0; }
@media (max-width: 768px) { .site-title { font-size: 22px; } }

/* ---------- 主体 ---------- */
.main-content { padding: 28px 18px; min-height: 60vh; }

/* ---------- Flash 消息 ---------- */
.flash { padding: 12px 16px; border-radius: 6px; margin-bottom: 16px; border: 1px solid; }
.flash-success { background: var(--surface-2); border-color: var(--primary-light); color: var(--primary-dark); }
.flash-error { background: #fdecea; border-color: var(--danger); color: var(--danger); }
.flash-info { background: var(--bg-alt); border-color: var(--border); color: var(--text); }

/* ---------- 卡片 / 表单 ---------- */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 18px;
    box-shadow: var(--shadow);
}
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 800px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.form-group { margin-bottom: 14px; }
label { display: block; font-weight: 600; margin-bottom: 5px; color: var(--text); }
input[type=text], input[type=email], input[type=password], input[type=url],
input[type=number], textarea, select {
    width: 100%; padding: 10px 12px; border: 1px solid var(--border);
    border-radius: 6px; font-size: 14px; background: var(--surface-2); color: var(--text);
    font-family: inherit;
}
input:focus, textarea:focus, select:focus {
    outline: none; border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}
textarea { min-height: 120px; resize: vertical; }
.form-actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- 表格 ---------- */
.table { width: 100%; border-collapse: collapse; background: var(--surface); }
.table th, .table td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: left; }
.table th { background: var(--bg-alt); color: var(--primary-dark); font-weight: 700; }
.table tr:hover td { background: var(--surface-2); }

/* ---------- 轮播图 ---------- */
.carousel {
    position: relative; overflow: hidden; border-radius: 12px;
    border: 3px solid var(--primary); background: var(--surface);
    margin-bottom: 22px; box-shadow: var(--shadow);
}
.carousel-track { display: flex; transition: transform .5s ease; }
.carousel-slide { min-width: 100%; position: relative; }
.carousel-slide img { width: 100%; height: 380px; object-fit: cover; }
.carousel-slide .caption {
    position: absolute; left: 0; right: 0; bottom: 0;
    background: linear-gradient(transparent, rgba(0,0,0,.75));
    color: #fff; padding: 30px 20px 14px; font-size: 18px; font-weight: 600;
}
.carousel-btn {
    position: absolute; top: 50%; transform: translateY(-50%);
    background: rgba(0,0,0,.45); color: #fff; border: 0; padding: 10px 14px;
    font-size: 20px; cursor: pointer; border-radius: 50%;
}
.carousel-btn:hover { background: rgba(0,0,0,.7); }
.carousel-prev { left: 12px; }
.carousel-next { right: 12px; }
.carousel-dots { text-align: center; padding: 8px 0; }
.carousel-dots span {
    display: inline-block; width: 10px; height: 10px; margin: 0 4px;
    background: var(--border); border-radius: 50%; cursor: pointer;
}
.carousel-dots span.active { background: var(--primary); }
@media (max-width: 768px) { .carousel-slide img { height: 220px; } }

/* ---------- 欢迎区 ---------- */
.hero {
    background: var(--header-grad); color: #fff;
    padding: 40px 26px; border-radius: 14px; margin-bottom: 22px;
}
.hero h2 { color: #fff; font-size: 26px; }
.hero p { opacity: .92; }

/* ---------- 特性卡片 ---------- */
.feature-card {
    background: var(--surface); border: 1px solid var(--border);
    border-left: 5px solid var(--primary); border-radius: 10px;
    padding: 18px; box-shadow: var(--shadow);
}
.feature-card .icon { font-size: 34px; margin-bottom: 8px; }
.feature-card h3 { margin-bottom: 6px; }

/* ---------- 论坛板块 ---------- */
.category-list .cat-row {
    display: flex; align-items: center; gap: 16px; padding: 14px;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 8px; margin-bottom: 10px; box-shadow: var(--shadow);
}
.cat-row .cat-icon {
    width: 50px; height: 50px; border-radius: 8px;
    background: var(--header-grad); color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; flex-shrink: 0;
}
.cat-row .cat-meta { flex: 1; }
.cat-row .cat-meta h3 { margin: 0 0 4px; }
.cat-row .cat-meta small { color: var(--text-muted); }
.cat-row .cat-stats { text-align: right; font-size: 13px; color: var(--text-muted); }

/* ---------- 帖子列表 ---------- */
.thread-list .thread-row {
    display: flex; align-items: center; gap: 14px; padding: 12px 14px;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 8px; margin-bottom: 8px;
}
.thread-row .t-meta { flex: 1; }
.thread-row .t-title { font-size: 16px; font-weight: 700; color: var(--primary-dark); }
.thread-row .t-info { color: var(--text-muted); font-size: 13px; }
.thread-row .t-stats { text-align: right; font-size: 13px; min-width: 90px; }
.avatar-sm { width: 36px; height: 36px; border-radius: 50%; border: 2px solid var(--primary); object-fit: cover; }

/* ---------- 帖子详情 ---------- */
.thread-detail .thread-head { margin-bottom: 16px; }
.thread-detail .thread-body {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 10px; padding: 18px; box-shadow: var(--shadow);
}
.thread-detail .post {
    display: flex; gap: 14px; padding: 14px 0; border-top: 1px dashed var(--border);
}
.thread-detail .post:first-of-type { border-top: 0; }
.post .post-avatar img { width: 48px; height: 48px; border-radius: 50%; border: 2px solid var(--primary); }
.post .post-body { flex: 1; }
.post .post-meta { font-size: 13px; color: var(--text-muted); margin-bottom: 6px; }
.post .post-content { white-space: pre-wrap; word-wrap: break-word; }

/* ---------- 头像 ---------- */
.avatar-lg { width: 120px; height: 120px; border-radius: 50%; border: 4px solid var(--primary); object-fit: cover; }

/* ---------- 私信 ---------- */
.pm-list .pm-row {
    display: flex; align-items: center; gap: 12px; padding: 12px;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 8px; margin-bottom: 8px;
}
.pm-list .pm-row.unread { border-left: 4px solid var(--primary); }
.chat-window {
    background: var(--surface-2); border: 1px solid var(--border);
    border-radius: 10px; padding: 16px; max-height: 480px; overflow-y: auto;
}
.chat-msg { margin-bottom: 10px; max-width: 75%; }
.chat-msg .bubble {
    padding: 8px 12px; border-radius: 12px; word-wrap: break-word; white-space: pre-wrap;
}
.chat-msg.out { margin-left: auto; }
.chat-msg.out .bubble { background: var(--primary); color: #fff; }
.chat-msg.in .bubble { background: var(--surface); border: 1px solid var(--border); }
.chat-msg .meta { font-size: 11px; color: var(--text-muted); margin-top: 3px; }

/* ---------- 后台 ---------- */
.admin-layout { display: grid; grid-template-columns: 220px 1fr; gap: 20px; }
.admin-sidebar {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 10px; padding: 14px; box-shadow: var(--shadow);
    align-self: start; position: sticky; top: 80px;
}
.admin-sidebar h3 { margin-bottom: 8px; font-size: 16px; }
.admin-sidebar a {
    display: block; padding: 8px 12px; border-radius: 6px; color: var(--text);
    margin-bottom: 2px;
}
.admin-sidebar a:hover, .admin-sidebar a.active { background: var(--primary); color: #fff; }
@media (max-width: 800px) { .admin-layout { grid-template-columns: 1fr; } .admin-sidebar { position: static; } }

.stat-card {
    background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
    padding: 18px; box-shadow: var(--shadow); text-align: center;
}
.stat-card .num { font-size: 32px; font-weight: 800; color: var(--primary-dark); }
.stat-card .label { color: var(--text-muted); font-size: 13px; }

/* ---------- AI 小部件 ---------- */
.ai-widget { position: fixed; bottom: 20px; right: 20px; z-index: 999; }
.ai-fab {
    width: 58px; height: 58px; border-radius: 50%; border: 0;
    background: var(--primary); color: #fff; font-size: 26px; cursor: pointer;
    box-shadow: 0 6px 20px rgba(0,0,0,.25); transition: transform .15s;
}
.ai-fab:hover { transform: scale(1.08); }
.ai-panel {
    position: absolute; bottom: 70px; right: 0; width: 340px; max-width: 90vw;
    background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
    box-shadow: 0 12px 30px rgba(0,0,0,.2); overflow: hidden;
}
.ai-header {
    background: var(--header-grad); color: #fff; padding: 10px 14px;
    display: flex; justify-content: space-between; align-items: center; font-weight: 700;
}
.ai-header button { background: rgba(255,255,255,.2); color: #fff; border: 0; border-radius: 4px; cursor: pointer; }
.ai-messages { max-height: 300px; overflow-y: auto; padding: 12px; }
.ai-msg { margin-bottom: 8px; }
.ai-msg .bubble { padding: 8px 12px; border-radius: 10px; max-width: 85%; white-space: pre-wrap; word-wrap: break-word; }
.ai-msg.ai-user { text-align: right; }
.ai-msg.ai-user .bubble { background: var(--primary); color: #fff; display: inline-block; }
.ai-msg.ai-bot .bubble { background: var(--surface-2); border: 1px solid var(--border); display: inline-block; }
.ai-input { display: flex; gap: 6px; padding: 10px; border-top: 1px solid var(--border); background: var(--surface-2); }
.ai-input input { flex: 1; }
.ai-input button { background: var(--primary); color: #fff; border: 0; padding: 0 14px; border-radius: 6px; cursor: pointer; }

/* ---------- 页脚 ---------- */
.site-footer {
    background: var(--surface); border-top: 3px solid var(--primary);
    color: var(--text-muted); padding: 28px 0 18px; margin-top: 40px;
}
.footer-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin-bottom: 18px;
}
.footer-col h4 { color: var(--text); margin-bottom: 10px; font-size: 15px; }
.footer-col p { font-size: 13px; line-height: 1.7; }
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: 6px; font-size: 14px; }
.footer-links a { color: var(--text-muted); text-decoration: none; transition: color .15s; }
.footer-links a:hover { color: var(--primary-dark); }
.footer-hr { border: 0; border-top: 1px solid var(--border); margin: 14px 0; }
.footer-copy { text-align: center; font-size: 12px; color: var(--text-muted); }

@media (max-width: 768px) {
    .footer-grid { grid-template-columns: 1fr; gap: 18px; }
}

/* ---------- 画廊（响应式瀑布流） ---------- */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 16px;
}
.gallery-item {
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 10px; overflow: hidden; margin: 0;
    box-shadow: var(--shadow); transition: transform .15s, box-shadow .15s;
    display: flex; flex-direction: column;
}
.gallery-item:hover { transform: translateY(-3px); box-shadow: 0 10px 30px rgba(60, 90, 40, .14); }
.gallery-item img {
    width: 100%; height: 200px; object-fit: cover; display: block;
    background: var(--bg-alt);
}
.gallery-item figcaption { padding: 10px 12px; }
.g-title { font-weight: 600; color: var(--text); margin-bottom: 4px; }
.g-desc { font-size: 12px; color: var(--text-muted); margin-bottom: 6px; line-height: 1.4; }
.g-meta {
    display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
    font-size: 12px; color: var(--text-muted);
}
.g-del { color: var(--danger); text-decoration: none; margin-left: auto; }

@media (max-width: 600px) {
    .gallery-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
    .gallery-item img { height: 140px; }
    .g-title { font-size: 14px; }
}

/* ---------- 用户网格（关注 / 粉丝） ---------- */
.user-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 10px; margin-top: 10px;
}
.user-card {
    display: flex; flex-direction: column; align-items: center; gap: 6px;
    background: var(--surface-2); border: 1px solid var(--border);
    padding: 12px 8px; border-radius: 8px; text-decoration: none; color: var(--text);
    text-align: center; transition: background .15s;
}
.user-card:hover { background: var(--bg-alt); }
.user-card div { font-size: 13px; }

/* ---------- 统计卡片 ---------- */
.grid.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.stat-card {
    background: var(--surface-2); border: 1px solid var(--border);
    padding: 16px; border-radius: 8px; text-align: center;
}
.stat-card .num { font-size: 26px; font-weight: 700; color: var(--primary-dark); }
.stat-card .label { font-size: 13px; color: var(--text-muted); margin-top: 4px; }
@media (max-width: 600px) { .grid.grid-4 { grid-template-columns: repeat(2, 1fr); } }

/* ---------- 功能卡片 ---------- */
.feature-card {
    background: var(--surface); border: 1px solid var(--border);
    padding: 18px; border-radius: 10px; box-shadow: var(--shadow);
}
.feature-card .icon { font-size: 32px; margin-bottom: 8px; }
.feature-card h4 { margin: 6px 0; color: var(--text); }
.feature-card p { font-size: 14px; color: var(--text-muted); line-height: 1.6; margin: 0; }
.feature-card code {
    background: var(--bg-alt); padding: 1px 6px; border-radius: 3px;
    color: var(--primary-dark); font-size: 12px;
}

/* ---------- 表格 ---------- */
.table { width: 100%; border-collapse: collapse; margin-top: 10px; }
.table th, .table td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: left; }
.table th { background: var(--bg-alt); color: var(--text); font-weight: 600; }

/* ---------- 头像尺寸 ---------- */
.avatar-xs { width: 20px; height: 20px; border-radius: 50%; object-fit: cover; }

/* ---------- 分页 ---------- */
.pagination { display: flex; gap: 6px; justify-content: center; flex-wrap: wrap; }
.pagination a {
    display: inline-block; min-width: 32px; padding: 6px 10px; text-align: center;
    background: var(--surface); border: 1px solid var(--border); border-radius: 6px;
    color: var(--text); text-decoration: none;
}
.pagination a.active { background: var(--primary); color: #fff; border-color: var(--primary-dark); }

/* ---------- 敏感词徽章 ---------- */
.badge-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.badge-word {
    display: inline-flex; align-items: center; gap: 6px;
    background: var(--bg-alt); border: 1px solid var(--border);
    padding: 4px 10px; border-radius: 14px; font-size: 13px; color: var(--text);
}
.badge-word a { color: var(--danger); text-decoration: none; font-size: 12px; }

/* ---------- 杂项 ---------- */
.text-muted { color: var(--text-muted); }
.flex { display: flex; gap: 10px; align-items: center; }
.flex-between { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.mt-1 { margin-top: 8px; } .mt-2 { margin-top: 16px; } .mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; } .mb-2 { margin-bottom: 16px; }
.tag { display: inline-block; background: var(--bg-alt); color: var(--primary-dark); padding: 2px 8px; border-radius: 4px; font-size: 12px; font-weight: 600; }
.tag.admin { background: var(--accent); color: #2c2c00; }
.hr { border: 0; border-top: 1px dashed var(--border); margin: 16px 0; }
.alert-warn { background: #fff8e1; border: 1px solid #ffca28; color: #8a6d00; padding: 10px; border-radius: 6px; margin-bottom: 14px; }