:root {
    --bg: #f4f6fb;
    --panel: #ffffff;
    --line: #d9dfeb;
    --text: #1f2a44;
    --muted: #63708a;
    --primary: #325dcb;
    --danger: #b62f3a;
    --ok: #217346;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: Arial, Helvetica, sans-serif; color: var(--text); background: var(--bg); }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { width: min(1080px, calc(100% - 32px)); margin: 0 auto; }
.row { display: flex; gap: 16px; }
.between { justify-content: space-between; }
.center { align-items: center; }
.topbar { background: #1d2b53; color: #fff; padding: 14px 0; box-shadow: 0 2px 8px rgba(0,0,0,.12); }
.brand { color: #fff; font-size: 22px; font-weight: 700; }
.nav { display: flex; flex-wrap: wrap; gap: 14px; }
.nav a { color: #fff; }
.page { padding: 24px 0 40px; }
.card, .topic-card, .post, .form-card, .sidebar-box { background: var(--panel); border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 6px 18px rgba(17, 32, 74, .06); }
.card, .form-card, .sidebar-box { padding: 18px; }
.grid { display: grid; grid-template-columns: 1fr 320px; gap: 22px; }
.topic-list { display: grid; gap: 16px; }
.topic-card { padding: 18px; display: grid; gap: 8px; }
.meta { color: var(--muted); font-size: 14px; }
.title-row { display: flex; justify-content: space-between; gap: 12px; align-items: start; }
.badge { display: inline-block; padding: 4px 10px; border-radius: 999px; background: #eaf0ff; color: var(--primary); font-size: 13px; }
.flash { padding: 12px 14px; margin-bottom: 18px; border-radius: 10px; }
.flash-success { background: #eaf8ee; color: var(--ok); border: 1px solid #cce8d5; }
.flash-error { background: #fcebec; color: var(--danger); border: 1px solid #f3c3c7; }
form { display: grid; gap: 12px; }
input[type=text], input[type=password], textarea, input[type=file] { width: 100%; padding: 12px 13px; border: 1px solid var(--line); border-radius: 10px; font: inherit; background: #fff; }
textarea { min-height: 140px; resize: vertical; }
button, .button { display: inline-block; border: none; border-radius: 10px; background: var(--primary); color: #fff; padding: 11px 16px; font: inherit; cursor: pointer; }
button.danger, .button.danger { background: var(--danger); }
button.secondary, .button.secondary { background: #6d7891; }
.post-list { display: grid; gap: 14px; margin-top: 18px; }
.post { display: grid; grid-template-columns: 220px 1fr; overflow: hidden; }
.post-author { background: #f8faff; padding: 16px; border-right: 1px solid var(--line); }
.post-content { padding: 16px; }
.post-content p { white-space: pre-wrap; margin-top: 0; line-height: 1.55; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.empty { color: var(--muted); font-style: italic; }
.small { font-size: 13px; color: var(--muted); }
.kpi { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.kpi .card strong { display: block; font-size: 28px; margin-top: 8px; }
.table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 12px; overflow: hidden; }
.table th, .table td { border-bottom: 1px solid var(--line); padding: 10px 12px; text-align: left; vertical-align: top; }
.table th { background: #eef3ff; }
@media (max-width: 800px) {
    .grid { grid-template-columns: 1fr; }
    .post { grid-template-columns: 1fr; }
    .post-author { border-right: none; border-bottom: 1px solid var(--line); }
}