:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --surface-muted: #f8fafc;
    --text: #172033;
    --muted: #687386;
    --line: #e3e8ef;
    --primary: #3157d5;
    --primary-dark: #2445b4;
    --success: #16895a;
    --danger: #c43c47;
    --warning: #a36800;
    --sidebar: #15213b;
    --sidebar-muted: #9eabc2;
    --radius: 12px;
    --shadow: 0 8px 28px rgba(23, 32, 51, .07);
    font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
}

* { box-sizing: border-box; }
html { min-width: 320px; }
body { margin: 0; background: var(--bg); color: var(--text); font-size: 14px; line-height: 1.55; }
a { color: inherit; }
button, input, textarea, select { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }

.admin-shell { display: flex; min-height: 100vh; }
.sidebar { position: fixed; inset: 0 auto 0 0; z-index: 30; display: flex; width: 240px; flex-direction: column; background: var(--sidebar); color: #fff; transition: transform .18s ease; }
.sidebar__brand { display: flex; min-height: 72px; align-items: center; gap: 11px; padding: 0 20px; border-bottom: 1px solid rgba(255,255,255,.08); font-size: 16px; font-weight: 700; }
.sidebar__brand-mark { display: grid; width: 34px; height: 34px; place-items: center; border-radius: 9px; background: #fff; color: var(--sidebar); font-size: 13px; }
.sidebar__nav { display: grid; gap: 5px; padding: 18px 12px; }
.sidebar__link { display: flex; min-height: 44px; align-items: center; gap: 12px; padding: 0 13px; border-radius: 9px; color: var(--sidebar-muted); text-decoration: none; }
.sidebar__link:hover, .sidebar__link.is-active { background: rgba(255,255,255,.1); color: #fff; }
.sidebar__icon { display: grid; width: 25px; height: 25px; place-items: center; border: 1px solid rgba(255,255,255,.18); border-radius: 7px; font-size: 11px; font-weight: 800; }
.sidebar__notice { margin: auto 14px 16px; padding: 13px; border: 1px solid rgba(255,255,255,.1); border-radius: 10px; color: var(--sidebar-muted); font-size: 12px; }

.admin-main { width: calc(100% - 240px); min-width: 0; margin-left: 240px; }
.topbar { position: sticky; top: 0; z-index: 20; display: flex; min-height: 72px; align-items: center; gap: 16px; padding: 12px 28px; border-bottom: 1px solid var(--line); background: rgba(255,255,255,.96); backdrop-filter: blur(8px); }
.topbar h1 { margin: 0; font-size: 21px; line-height: 1.25; }
.topbar p { margin: 2px 0 0; color: var(--muted); font-size: 12px; }
.topbar__menu { display: none; border: 0; background: transparent; color: var(--text); font-size: 22px; cursor: pointer; }
.topbar__account { display: flex; align-items: center; gap: 14px; margin-left: auto; color: var(--muted); }
.topbar__account form { margin: 0; }
.content { width: 100%; padding: 26px 28px 40px; }

.panel { border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.panel__header { display: flex; min-height: 70px; align-items: center; justify-content: space-between; gap: 20px; padding: 18px 22px; border-bottom: 1px solid var(--line); }
.panel__header h2 { margin: 0; font-size: 17px; }
.panel__header p { margin: 3px 0 0; color: var(--muted); font-size: 12px; }
.panel__header--actions { flex-wrap: wrap; }

.metric-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; margin-bottom: 22px; }
.metric-card { position: relative; overflow: hidden; min-height: 135px; padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: var(--shadow); }
.metric-card::after { position: absolute; right: -28px; bottom: -38px; width: 110px; height: 110px; border-radius: 50%; background: rgba(49,87,213,.08); content: ""; }
.metric-card > span { color: var(--muted); }
.metric-card strong { display: block; margin: 8px 0 2px; color: var(--primary); font-size: 30px; line-height: 1.1; }
.metric-card small { color: var(--muted); }
.metric-card--success strong { color: var(--success); }
.metric-card--muted strong { color: #69758a; }
.metric-card--accent strong { font-size: 23px; }

.dashboard-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(340px, .85fr); gap: 22px; }
.activity-list { display: grid; gap: 0; padding: 7px 22px 18px; }
.activity-item { display: grid; grid-template-columns: 12px 1fr; gap: 10px; padding: 13px 0; border-bottom: 1px solid var(--line); }
.activity-item:last-child { border-bottom: 0; }
.activity-item__dot { width: 8px; height: 8px; margin-top: 7px; border-radius: 50%; background: var(--primary); }
.activity-item strong { font-size: 13px; }
.activity-item p { margin: 2px 0; color: var(--muted); }
.activity-item small { color: #8b94a4; }

.table-wrap { width: 100%; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; white-space: nowrap; }
th, td { padding: 13px 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
th { background: var(--surface-muted); color: var(--muted); font-size: 12px; font-weight: 650; }
tbody tr:hover { background: #fbfcfe; }
tbody tr:last-child td { border-bottom: 0; }
td code { white-space: normal; word-break: break-all; }
.site-table td:nth-child(4) { min-width: 210px; max-width: 330px; }
.empty-cell, .empty-state { padding: 36px 20px; color: var(--muted); text-align: center; }

.button { display: inline-grid; min-height: 38px; place-items: center; padding: 8px 15px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--text); font-weight: 650; line-height: 1.2; text-align: center; text-decoration: none; cursor: pointer; }
.button:hover { border-color: #bcc6d3; }
.button--primary { border-color: var(--primary); background: var(--primary); color: #fff; }
.button--primary:hover { border-color: var(--primary-dark); background: var(--primary-dark); }
.button--success { border-color: var(--success); background: var(--success); color: #fff; }
.button--danger { border-color: #f2c6cb; background: #fff2f3; color: var(--danger); }
.button--ghost { background: transparent; }
.button--small { min-height: 31px; padding: 5px 10px; font-size: 12px; }
.button--block { width: 100%; }
.text-link { color: var(--primary); font-weight: 650; text-decoration: none; }
.text-link:hover { text-decoration: underline; }

.badge { display: inline-flex; align-items: center; min-height: 24px; padding: 3px 9px; border-radius: 999px; font-size: 12px; font-weight: 700; }
.badge--success { background: #e8f7f0; color: var(--success); }
.badge--danger { background: #fff0f1; color: var(--danger); }
.badge--muted { background: #edf0f4; color: #687386; }

.alert { margin-bottom: 18px; padding: 12px 15px; border: 1px solid; border-radius: 9px; }
.alert ul { margin: 7px 0 0; padding-left: 20px; }
.alert--success { border-color: #a8dec8; background: #ecfaf4; color: #116b48; }
.alert--error { border-color: #efbcc2; background: #fff1f2; color: #9d2833; }
.alert--warning { border-color: #ecd394; background: #fff9e8; color: #825800; }

.filter-bar { display: flex; gap: 8px; padding: 14px 20px; border-bottom: 1px solid var(--line); }
.filter-chip { padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); text-decoration: none; }
.filter-chip.is-active { border-color: var(--primary); background: #eef2ff; color: var(--primary); }
.row-actions { display: flex; align-items: center; gap: 6px; }
.row-actions form { margin: 0; }

.site-form { display: grid; gap: 20px; }
.form-section { overflow: hidden; }
.form-grid { display: grid; gap: 18px; padding: 22px; }
.form-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.field { display: grid; align-content: start; gap: 7px; }
.field > span, .toggle-field > span { font-weight: 650; }
.field--wide { grid-column: 1 / -1; }
.field input, .field textarea, .field select { width: 100%; border: 1px solid #ccd4df; border-radius: 8px; outline: none; background: #fff; color: var(--text); }
.field input, .field select { min-height: 42px; padding: 8px 11px; }
.field textarea { min-height: 76px; padding: 10px 11px; resize: vertical; }
.field input:focus, .field textarea:focus, .field select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(49,87,213,.1); }
.field small { color: var(--muted); }
.field__error { color: var(--danger) !important; }
.toggle-field { display: flex; min-height: 42px; align-items: center; gap: 9px; align-self: end; padding: 9px 11px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-muted); }
.toggle-field input { width: 17px; height: 17px; accent-color: var(--primary); }
.form-actions { display: flex; align-items: center; justify-content: flex-end; gap: 10px; padding: 4px 0 16px; }

.version-summary { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; margin-bottom: 20px; }
.version-summary > div { padding: 19px 22px; border-right: 1px solid var(--line); }
.version-summary > div:last-child { border-right: 0; }
.version-summary span { display: block; margin-bottom: 5px; color: var(--muted); font-size: 12px; }
.version-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; margin-bottom: 18px; }
.code-panel { overflow: hidden; }
.code-panel pre { min-height: 420px; max-height: 620px; margin: 0; padding: 18px 20px; overflow: auto; background: #101827; color: #d8e2f0; font: 12px/1.65 Consolas, Monaco, monospace; white-space: pre-wrap; word-break: break-word; }

.settings-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.settings-card { padding: 22px; }
.settings-card h2 { margin: 0 0 14px; font-size: 17px; }
.settings-card p, .settings-card small { color: var(--muted); }
.settings-card dl { margin: 0; }
.settings-card dl div { display: flex; justify-content: space-between; gap: 16px; padding: 11px 0; border-bottom: 1px solid var(--line); }
.settings-card dt { color: var(--muted); }
.settings-card dd { margin: 0; font-weight: 650; text-align: right; }
.path-list { padding-left: 20px; }

.login-page { display: grid; min-height: 100vh; place-items: center; padding: 24px; background: radial-gradient(circle at top, #eaf0ff 0, var(--bg) 48%); }
.login-card { width: min(420px, 100%); padding: 34px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); box-shadow: 0 18px 50px rgba(23,32,51,.12); }
.login-card__logo { display: grid; width: 48px; height: 48px; margin-bottom: 20px; place-items: center; border-radius: 12px; background: var(--primary); color: #fff; font-weight: 800; }
.login-card h1 { margin: 0 0 4px; font-size: 24px; }
.login-card > p { margin: 0 0 24px; color: var(--muted); }
.stack-form { display: grid; gap: 17px; }

@media (max-width: 1100px) {
    .metric-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .dashboard-grid, .settings-grid { grid-template-columns: 1fr; }
    .version-summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .version-summary > div:nth-child(2) { border-right: 0; }
    .version-summary > div:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
}

@media (max-width: 820px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.is-open { transform: translateX(0); }
    .admin-main { width: 100%; margin-left: 0; }
    .topbar { padding-inline: 18px; }
    .topbar__menu { display: block; }
    .content { padding: 20px 16px 32px; }
    .dashboard-grid, .version-grid { grid-template-columns: 1fr; }
    .topbar p { display: none; }
}

@media (max-width: 620px) {
    .metric-grid, .form-grid--2, .version-summary { grid-template-columns: 1fr; }
    .metric-grid { gap: 12px; }
    .form-grid { padding: 18px; }
    .version-summary > div { border-right: 0; border-bottom: 1px solid var(--line); }
    .version-summary > div:last-child { border-bottom: 0; }
    .topbar__account > span { display: none; }
    .panel__header { align-items: flex-start; }
    .row-actions { min-width: 330px; }
}