:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --text: #182230;
    --muted: #667085;
    --line: #e4e7ec;
    --primary: #3157d5;
    --primary-dark: #2444ad;
    --success: #067647;
    --success-bg: #ecfdf3;
    --warning: #b54708;
    --warning-bg: #fffaeb;
    --danger: #b42318;
    --danger-bg: #fef3f2;
    --shadow: 0 8px 30px rgba(16, 24, 40, .07);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.55;
}

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

.container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }

.topbar {
    background: #101828;
    color: #fff;
    position: sticky;
    top: 0;
    z-index: 30;
    box-shadow: 0 2px 12px rgba(16, 24, 40, .18);
}

.topbar-inner {
    min-height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    font-weight: 800;
    letter-spacing: -.02em;
}
.brand:hover { text-decoration: none; }

.brand-mark {
    display: inline-grid;
    place-items: center;
    width: 34px;
    height: 34px;
    border-radius: 10px;
    background: #fff;
    color: #101828;
    font-size: 13px;
}

.nav { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.nav a, .link-button { color: #d0d5dd; font-size: 14px; }
.nav a:hover, .link-button:hover { color: #fff; text-decoration: none; }

.inline-form { display: inline; margin: 0; }
.link-button {
    border: 0;
    padding: 0;
    background: transparent;
    cursor: pointer;
    font: inherit;
}

main.container { padding: 30px 0 48px; min-height: calc(100vh - 130px); }

.page-head {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    align-items: flex-start;
    margin-bottom: 22px;
}
.page-head h1 { margin: 0 0 6px; font-size: clamp(25px, 3vw, 36px); letter-spacing: -.035em; }
.page-head p { margin: 0; color: var(--muted); }

.actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    min-height: 40px;
    padding: 9px 14px;
    border-radius: 9px;
    border: 1px solid var(--line);
    background: #fff;
    color: var(--text);
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
}
.btn:hover { text-decoration: none; border-color: #98a2b3; }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn-danger { color: var(--danger); border-color: #fecdca; background: #fff; }
.btn-small { min-height: 32px; padding: 6px 10px; font-size: 13px; }

.card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow);
}

.card-body { padding: 20px; }
.card + .card { margin-top: 18px; }

.searchbar {
    display: flex;
    gap: 10px;
    margin-bottom: 18px;
}
.searchbar input { flex: 1; }

.article-list { display: grid; gap: 16px; }
.article-card { overflow: hidden; }
.article-main { padding: 20px; }
.article-title { margin: 0 0 7px; font-size: 19px; line-height: 1.35; }
.meta { color: var(--muted); font-size: 14px; }
.meta span + span::before { content: "•"; margin: 0 7px; color: #98a2b3; }
.doi { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; }

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(155px, 1fr));
    border-top: 1px solid var(--line);
    background: #fcfcfd;
}
.metric {
    padding: 14px 16px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}
.metric-name { color: var(--muted); font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .04em; }
.metric-value { font-size: 25px; font-weight: 800; letter-spacing: -.03em; margin-top: 3px; }
.metric-sub { font-size: 12px; color: var(--muted); margin-top: 2px; }
.delta-positive { color: var(--success); font-weight: 800; }

.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.form-group { display: grid; gap: 6px; }
.form-group.full { grid-column: 1 / -1; }
label { font-size: 14px; font-weight: 700; }
.hint { color: var(--muted); font-size: 12px; }

input, textarea, select {
    width: 100%;
    border: 1px solid #d0d5dd;
    border-radius: 9px;
    padding: 10px 12px;
    background: #fff;
    color: var(--text);
    font: inherit;
}
input:focus, textarea:focus, select:focus {
    outline: 3px solid rgba(49, 87, 213, .13);
    border-color: var(--primary);
}
textarea { min-height: 110px; resize: vertical; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; min-width: 760px; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .04em; background: #fcfcfd; }
td { font-size: 14px; }

.status {
    display: inline-flex;
    padding: 3px 8px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 800;
}
.status-success { color: var(--success); background: var(--success-bg); }
.status-warning { color: var(--warning); background: var(--warning-bg); }
.status-danger { color: var(--danger); background: var(--danger-bg); }
.status-muted { color: #475467; background: #f2f4f7; }

.alert {
    padding: 12px 15px;
    border-radius: 10px;
    margin-bottom: 16px;
    border: 1px solid transparent;
}
.alert-success { background: var(--success-bg); color: var(--success); border-color: #abefc6; }
.alert-error { background: var(--danger-bg); color: var(--danger); border-color: #fecdca; }
.alert-warning { background: var(--warning-bg); color: var(--warning); border-color: #fedf89; }

.empty { text-align: center; padding: 46px 22px; color: var(--muted); }
.auth-card { width: min(440px, 100%); margin: 40px auto; }
.auth-card h1 { margin-top: 0; }

.detail-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(280px, .8fr);
    gap: 18px;
}
.definition-list { display: grid; grid-template-columns: 140px 1fr; gap: 10px 14px; margin: 0; }
.definition-list dt { color: var(--muted); }
.definition-list dd { margin: 0; overflow-wrap: anywhere; }

.footer { padding: 20px 0 30px; color: var(--muted); font-size: 13px; text-align: center; }

.checkbox-row { display: flex; align-items: center; gap: 8px; }
.checkbox-row input { width: auto; }

.danger-zone { border-color: #fecdca; }
.error-text { color: var(--danger); font-size: 12px; }
.break-anywhere { overflow-wrap: anywhere; }

@media (max-width: 780px) {
    .topbar-inner, .page-head { align-items: flex-start; flex-direction: column; padding: 13px 0; }
    .nav { gap: 12px; }
    .form-grid, .detail-grid { grid-template-columns: 1fr; }
    .form-group.full { grid-column: auto; }
    .definition-list { grid-template-columns: 1fr; gap: 2px; }
    .definition-list dd { margin-bottom: 9px; }
}