:root {
    --bg: #f4f6f8;
    --card: #ffffff;
    --text: #202631;
    --muted: #68717d;
    --line: #dfe4ea;
    --primary: #1f5fae;
    --primary-dark: #164a88;
    --danger: #a52828;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: "Segoe UI", Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.topbar {
    min-height: 64px;
    display: flex;
    align-items: center;
    gap: 28px;
    padding: 0 28px;
    background: #17212f;
    color: #fff;
}
.topbar a { color: #fff; }
.brand { font-weight: 700; font-size: 19px; }
nav { display: flex; gap: 18px; flex: 1; }
.user-area { display: flex; align-items: center; gap: 12px; }
.container { max-width: 1320px; margin: 0 auto; padding: 28px; }
.page-head { display: flex; justify-content: space-between; align-items: center; gap: 20px; margin-bottom: 20px; }
h1 { margin: 0 0 6px; font-size: 28px; }
h2 { margin-top: 0; }
.muted { color: var(--muted); margin: 0; }
.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 22px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0,0,0,.03);
}
.narrow { max-width: 620px; }
.stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 20px;
}
.stat {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 22px;
}
.stat strong { display: block; font-size: 34px; }
.stat span { color: var(--muted); }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 13px; }
label { display: block; font-weight: 600; margin: 12px 0 6px; }
input, select, textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #cbd3dc;
    border-radius: 6px;
    font: inherit;
    background: #fff;
}
textarea { resize: vertical; }
.checkbox { display: flex; align-items: center; gap: 8px; font-weight: normal; }
.checkbox input { width: auto; }
.form-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px 16px;
}
.span-2 { grid-column: span 2; }
.span-3 { grid-column: span 3; }
.actions { display: flex; gap: 10px; margin-top: 20px; }
.btn {
    display: inline-block;
    border: 1px solid #c3cad2;
    border-radius: 6px;
    padding: 9px 14px;
    background: #fff;
    color: var(--text);
    cursor: pointer;
    font: inherit;
}
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); text-decoration: none; }
.full { width: 100%; margin-top: 12px; }
.link-button {
    border: 0;
    background: transparent;
    padding: 0;
    color: var(--primary);
    cursor: pointer;
    font: inherit;
}
.topbar .link-button { color: #fff; }
.filters { display: grid; grid-template-columns: 2fr 1fr auto; gap: 10px; margin-bottom: 16px; }
.badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 999px;
    background: #edf2f7;
    font-size: 12px;
}
.detail-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 20px; }
.details { display: grid; grid-template-columns: 130px 1fr; gap: 8px 12px; }
.details dt { font-weight: 600; color: var(--muted); }
.details dd { margin: 0; }
.text-block { white-space: pre-wrap; padding: 14px; background: #f7f9fb; border-radius: 6px; }
.timeline-item { border-left: 3px solid #cad4df; padding: 2px 0 16px 14px; margin-left: 4px; }
.timeline-meta { color: var(--muted); font-size: 12px; margin-bottom: 5px; }
.status-form, .interaction-form { margin-top: 20px; }
.status-form { display: grid; grid-template-columns: 1fr auto; gap: 10px; }
.login-wrap { min-height: calc(100vh - 130px); display: grid; place-items: center; }
.login-card { width: 100%; max-width: 420px; }
.validation { color: var(--danger); font-size: 13px; }
.alert { padding: 12px 14px; border-radius: 6px; margin-bottom: 16px; }
.alert-error { background: #fdecec; color: #8e1c1c; border: 1px solid #f3baba; }

@media (max-width: 850px) {
    .topbar { align-items: flex-start; flex-direction: column; padding: 16px; gap: 12px; }
    nav { flex-wrap: wrap; }
    .container { padding: 16px; }
    .stats { grid-template-columns: 1fr 1fr; }
    .detail-grid { grid-template-columns: 1fr; }
    .form-grid { grid-template-columns: 1fr; }
    .span-2, .span-3 { grid-column: span 1; }
    .filters { grid-template-columns: 1fr; }
    table { display: block; overflow-x: auto; }
}