:root {
    --ink: #172033;
    --muted: #5d6b82;
    --line: #e4e9f0;
    --bg: #eef2f6;
    --card: #ffffff;
    --side: #101826;
    --side-2: #182233;
    --blue: #1d6fe8;
    --blue-2: #144fad;
    --ok: #0f8a4b;
    --off: #9a3b3b;
    --err: #9a3412;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
    font: 15px/1.45 "Segoe UI", system-ui, sans-serif;
    color: var(--ink);
    background: var(--bg);
}
button, input { font: inherit; }
a { color: var(--blue-2); }

.shell { display: flex; min-height: 100vh; }
.side {
    width: 248px;
    flex: 0 0 248px;
    background: linear-gradient(180deg, var(--side), var(--side-2));
    color: #d5deea;
    display: flex;
    flex-direction: column;
    padding: 22px 16px;
}
.brand { display: flex; gap: 12px; align-items: center; margin-bottom: 28px; }
.brand strong { display: block; color: #fff; letter-spacing: .08em; font-size: 15px; }
.brand small { color: #8ea0b8; }
.mark {
    width: 36px; height: 36px; border-radius: 10px;
    background: #0b1220 url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 36 36'%3E%3Cpath fill='%231d6fe8' d='M8 8h14a8 8 0 0 1 0 16H8z'/%3E%3Cpath fill='%23fff' d='M15 13l8 5-8 5z'/%3E%3Ccircle cx='26' cy='9' r='2' fill='%237eb6ff'/%3E%3C/svg%3E") center/cover;
}
.side nav { display: flex; flex-direction: column; gap: 4px; }
.side nav a, .leave {
    color: #c5d0de;
    text-decoration: none;
    padding: 11px 12px;
    border-radius: 10px;
}
.side nav a.is-on, .side nav a:hover { background: rgba(29, 111, 232, .22); color: #fff; }
.leave { margin-top: auto; color: #9aabbf; }
.leave:hover { color: #fff; }

.main { flex: 1; padding: 28px 32px 48px; min-width: 0; }
.top { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 18px; }
.top h1 { margin: 0; font-size: 26px; font-weight: 650; }
.who { color: var(--muted); }

.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 18px 18px 16px;
    margin-bottom: 16px;
    box-shadow: 0 8px 24px rgba(16, 24, 38, .04);
}
.card h2 { margin: 0 0 14px; font-size: 16px; }
.narrow { max-width: 460px; }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-bottom: 16px; }
.stats article {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 16px 16px 14px;
}
.stats span, .stats em { display: block; color: var(--muted); font-style: normal; font-size: 13px; }
.stats strong { display: block; font-size: 30px; margin: 6px 0 2px; letter-spacing: -0.03em; }
.grid-charts { display: grid; grid-template-columns: 1.3fr .9fr; gap: 16px; }
.grid-charts .card { margin: 0 0 16px; }
canvas { width: 100%; display: block; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { color: var(--muted); font-size: 12px; font-weight: 650; letter-spacing: .04em; text-transform: uppercase; }
.mono { font-family: Consolas, "Courier New", monospace; font-size: 13px; }
.actions { display: flex; gap: 12px; align-items: center; white-space: nowrap; }
.actions form { margin: 0; }
.empty { color: var(--muted); margin: 0; }

.tag { display: inline-block; border-radius: 999px; padding: 3px 9px; font-size: 12px; font-weight: 650; }
.tag-on { background: #e7f6ee; color: var(--ok); }
.tag-off { background: #fdecec; color: var(--off); }

label { display: block; color: var(--muted); font-size: 13px; margin-bottom: 12px; }
input[type="text"], input[type="password"] {
    display: block; width: 100%; margin-top: 6px;
    border: 1px solid #d5dde8; border-radius: 10px; padding: 11px 12px; background: #fff; color: var(--ink);
}
input:focus { outline: 2px solid rgba(29, 111, 232, .25); border-color: var(--blue); }
button, .btn-quiet {
    border: 0; border-radius: 10px; background: var(--blue); color: #fff;
    padding: 11px 16px; cursor: pointer; text-decoration: none; display: inline-block;
}
button:hover { background: var(--blue-2); }
.btn-quiet { background: #e8eef6; color: var(--ink); }
.linkish { background: transparent; color: var(--blue-2); padding: 0; }
.linkish:hover { background: transparent; text-decoration: underline; }
.danger { color: var(--off); }
.form-row { display: grid; grid-template-columns: 220px 1fr auto; gap: 12px; align-items: end; }
.form-actions { display: flex; gap: 8px; align-items: center; padding-bottom: 12px; }
.stack { max-width: 420px; }
.stack-wide { max-width: 720px; }

.flash { border-radius: 12px; padding: 12px 14px; margin-bottom: 14px; }
.flash-ok { background: #e7f6ee; color: #0d6b3b; }
.flash-err { background: #fde8e2; color: var(--err); }

.gate { display: grid; place-items: center; min-height: 100vh; background: #101826; }
.login-card { width: min(400px, calc(100% - 32px)); }
.brand-center { margin-bottom: 8px; }
.login-card button { width: 100%; }

@media (max-width: 980px) {
    .shell { display: block; }
    .side { width: auto; flex-direction: row; flex-wrap: wrap; gap: 8px; }
    .side nav { flex-direction: row; flex-wrap: wrap; }
    .leave { margin-top: 0; }
    .stats, .grid-charts, .form-row { grid-template-columns: 1fr; }
    .main { padding: 18px; }
}