:root {
    --primary: #1d9bf0;
    --primary-dark: #1a8cd8;
    --bg: #f7f9f9;
    --card: #ffffff;
    --border: #eaeef0;
    --text: #0f1419;
    --muted: #536471;
    --danger: #f4212e;
    --green: #00ba7c;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
/* 修复：作者样式的 display 会覆盖 [hidden]，这里强制让 hidden 生效（聊天室灰屏根因） */
[hidden] { display: none !important; }
body {
    font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
    background: var(--bg); color: var(--text); line-height: 1.5;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== X 三栏布局 ===== */
.x-app { background: var(--bg); }
.x-layout { display: flex; justify-content: center; max-width: 1200px; margin: 0 auto; }

/* 左侧导航 */
.x-nav {
    width: 240px; flex-shrink: 0; position: sticky; top: 0; height: 100vh;
    padding: 6px 10px 16px; display: flex; flex-direction: column;
    border-right: 1px solid var(--border); background: var(--card);
}
.x-brand {
    display: flex; align-items: center; gap: 8px; font-size: 22px; font-weight: 800;
    color: var(--text); padding: 12px 14px;
}
.x-nav-list { display: flex; flex-direction: column; gap: 3px; margin-top: 2px; flex: 1; }
.x-nav-item {
    display: flex; align-items: center; gap: 14px; padding: 11px 14px;
    border-radius: 999px; color: var(--text); font-size: 18px; font-weight: 500;
}
.x-nav-item:hover { background: var(--bg); text-decoration: none; }
.x-nav-item.active { font-weight: 800; }
.x-nav-item .ico { font-size: 21px; width: 26px; text-align: center; }
.x-badge {
    background: var(--primary); color: #fff; font-size: 12px; font-weight: 700;
    border-radius: 999px; padding: 0 7px; line-height: 18px; margin-left: 2px;
}
.x-post-btn {
    background: var(--primary); color: #fff !important; text-align: center;
    padding: 13px; border-radius: 999px; font-weight: 800; font-size: 16px; margin: 12px 6px;
}
.x-post-btn:hover { background: var(--primary-dark); text-decoration: none; }
.x-logout { color: var(--muted); margin-top: auto; }

/* 中间信息流 */
.x-main {
    width: 600px; flex-shrink: 0; min-height: 100vh; padding: 16px;
    border-right: 1px solid var(--border); background: var(--bg);
}

/* 右侧栏 */
.x-right {
    width: 322px; flex-shrink: 0; padding: 12px 14px; position: sticky; top: 0;
    height: 100vh; overflow-y: auto;
}
.x-search input {
    width: 100%; padding: 11px 16px; border: 1px solid var(--border);
    background: var(--card); border-radius: 999px; outline: none; font-size: 14px;
}
.x-search input:focus { border-color: var(--primary); }
.x-widget {
    background: var(--card); border: 1px solid var(--border); border-radius: 16px;
    padding: 14px; margin-top: 14px;
}
.x-widget h3 { font-size: 16px; margin-bottom: 10px; }
.x-userline {
    display: flex; align-items: center; gap: 10px; padding: 8px 4px;
    color: var(--text); border-radius: 8px;
}
.x-userline:hover { background: var(--bg); text-decoration: none; }
.x-userline .name { font-weight: 600; flex: 1; }
.muted-tip { color: var(--muted); font-size: 14px; }
.x-foot { color: var(--muted); font-size: 12px; padding: 16px 6px; line-height: 1.7; }

/* 中屏：收起右侧栏 */
@media (max-width: 1080px) {
    .x-right { display: none; }
    .x-main { border-right: none; }
}
/* 窄屏：左导航变底部图标栏 */
@media (max-width: 700px) {
    .x-nav {
        position: fixed; bottom: 0; left: 0; right: 0; top: auto; width: auto; height: auto;
        flex-direction: row; justify-content: space-around; padding: 4px 6px;
        border-right: none; border-top: 1px solid var(--border); z-index: 200;
    }
    .x-brand, .x-nav-item .txt, .x-logout { display: none; }
    .x-nav-list { flex-direction: row; flex: none; gap: 0; justify-content: space-around; width: 100%; margin: 0; }
    .x-nav-item { padding: 8px 12px; }
    .x-post-btn { margin: 0; padding: 8px 16px; font-size: 14px; }
    .x-main { width: 100%; padding: 12px 12px 70px; }
}

/* 容器 */
.container { max-width: 680px; margin: 0 auto; padding: 16px; }
.card {
    background: var(--card); border: 1px solid var(--border);
    border-radius: 14px; padding: 16px; margin-bottom: 14px;
}

/* Flash */
.flash {
    padding: 12px 16px; border-radius: 10px; margin-bottom: 14px; font-size: 14px;
}
.flash-success { background: #e0f7ec; color: #00794f; }
.flash-error { background: #fde8e8; color: #b91c1c; }
.flash-warning { background: #fff7e0; color: #92660b; }

/* 发帖框 */
.composer textarea {
    width: 100%; border: none; resize: vertical; font-size: 17px;
    min-height: 70px; outline: none; font-family: inherit;
}
.composer-actions {
    display: flex; align-items: center; justify-content: space-between;
    margin-top: 10px; border-top: 1px solid var(--border); padding-top: 10px;
}
.composer-preview { position: relative; display: inline-block; margin-top: 10px; }
.composer-preview img {
    max-width: 100%; max-height: 280px; border-radius: 14px; border: 1px solid var(--border);
}
.composer-preview-x {
    position: absolute; top: 8px; left: 8px; width: 28px; height: 28px;
    border: none; border-radius: 50%; background: rgba(0,0,0,.6); color: #fff;
    cursor: pointer; font-size: 14px;
}

/* 帖子 */
.post { display: flex; gap: 12px; }
.avatar {
    width: 44px; height: 44px; border-radius: 50%; background: var(--primary);
    color: #fff; display: flex; align-items: center; justify-content: center;
    font-weight: 700; font-size: 18px; flex-shrink: 0; object-fit: cover;
}
.avatar-sm { width: 32px; height: 32px; font-size: 14px; }
.post-body { flex: 1; min-width: 0; }
.post-head { display: flex; align-items: center; gap: 6px; font-size: 14px; }
.post-head .name { font-weight: 700; color: var(--text); }
.post-head .time { color: var(--muted); }
.post-content { margin: 6px 0; white-space: pre-wrap; word-break: break-word; }
.post-image {
    max-width: 100%; border-radius: 14px; border: 1px solid var(--border); margin-top: 8px;
}
.post-actions {
    display: flex; gap: 28px; margin-top: 10px; color: var(--muted); font-size: 14px;
}
.post-actions button, .post-actions a {
    background: none; border: none; color: var(--muted); cursor: pointer;
    display: flex; align-items: center; gap: 5px; font-size: 14px;
}
.post-actions .liked { color: var(--danger); }
.post-actions button:hover { color: var(--primary); }

/* 按钮 */
.btn {
    background: var(--primary); color: #fff; border: none; padding: 9px 20px;
    border-radius: 20px; font-weight: 600; cursor: pointer; font-size: 15px;
}
.btn:hover { background: var(--primary-dark); }
.btn-sm { padding: 5px 14px; font-size: 13px; }
.btn-outline {
    background: #fff; color: var(--text); border: 1px solid var(--border);
}
.btn-danger { background: var(--danger); }
.btn-green { background: var(--green); }

/* 表单 */
.form-wrap { max-width: 380px; margin: 40px auto; }
.form-wrap h2 { margin-bottom: 18px; text-align: center; }
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.field input, .field textarea {
    width: 100%; padding: 11px 14px; border: 1px solid var(--border);
    border-radius: 10px; font-size: 15px; outline: none; font-family: inherit;
}
.field input:focus { border-color: var(--primary); }
.form-foot { text-align: center; margin-top: 14px; font-size: 14px; color: var(--muted); }

/* 个人主页 */
.profile-head { text-align: center; padding: 24px 16px; }
.profile-head .avatar { width: 80px; height: 80px; font-size: 32px; margin: 0 auto 12px; }
.profile-stats { display: flex; justify-content: center; gap: 28px; margin-top: 12px; color: var(--muted); }
.profile-stats b { color: var(--text); }

/* 聊天室为独立 Discord 深色页面，样式见 chat.css */

/* 表格（管理后台） */
.table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 12px; overflow: hidden; }
.table th, .table td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
.table th { background: var(--bg); color: var(--muted); }
.tag { padding: 2px 8px; border-radius: 8px; font-size: 12px; }
.tag-pending { background: #fff7e0; color: #92660b; }
.tag-active { background: #e0f7ec; color: #00794f; }
.tag-banned { background: #fde8e8; color: #b91c1c; }
.tag-admin { background: #e8f0fe; color: #1a73e8; }

/* 后台统计卡 */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 20px; }
.stat-card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px; text-align: center; }
.stat-card .num { font-size: 26px; font-weight: 800; }
.stat-card .label { color: var(--muted); font-size: 13px; }
.admin-tabs { display: flex; gap: 14px; margin-bottom: 16px; }

.footer { text-align: center; color: var(--muted); font-size: 13px; padding: 30px; }
.empty { text-align: center; color: var(--muted); padding: 40px; }
.inline { display: inline; }

@media (max-width: 600px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .nav-links { gap: 12px; font-size: 14px; }
}