:root {
  color-scheme: dark;
  --bg: #081018;
  --surface: #101b26;
  --surface-2: #152433;
  --surface-3: #1b2e40;
  --border: #294054;
  --text: #edf6fb;
  --muted: #8fa8b8;
  --primary: #31b6d4;
  --primary-strong: #56d5ef;
  --success: #39c889;
  --warning: #f1b64b;
  --danger: #ed6a6a;
  --shadow: 0 18px 50px rgba(0, 0, 0, .24);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body { margin: 0; background: radial-gradient(circle at 80% -20%, #17354a 0, transparent 38%), var(--bg); color: var(--text); min-height: 100vh; }
button, input, select { font: inherit; }
button { cursor: pointer; }
code { color: #a7e9f6; }

.topbar { height: 76px; display: flex; align-items: center; justify-content: space-between; padding: 0 28px; border-bottom: 1px solid var(--border); background: rgba(8, 16, 24, .92); backdrop-filter: blur(16px); position: sticky; top: 0; z-index: 20; }
.brand, .header-status, .page-heading, .panel-heading, .section-heading, .control-row { display: flex; align-items: center; }
.brand { gap: 13px; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 12px; background: linear-gradient(135deg, var(--primary), #17658b); font-weight: 800; letter-spacing: -.04em; box-shadow: 0 0 30px rgba(49,182,212,.22); }
.brand h1 { font-size: 17px; margin: 0; letter-spacing: .02em; }
.brand p { color: var(--muted); margin: 3px 0 0; font-size: 12px; }
.header-status { gap: 10px; }
.header-status strong, .header-status small { display: block; }
.header-status strong { text-transform: capitalize; font-size: 14px; }
.header-status small { color: var(--muted); margin-top: 3px; text-align: right; }
.status-dot { width: 11px; height: 11px; border-radius: 999px; background: var(--muted); box-shadow: 0 0 0 4px rgba(143,168,184,.1); }
.status-dot.running { background: var(--success); box-shadow: 0 0 0 4px rgba(57,200,137,.13), 0 0 18px rgba(57,200,137,.6); }
.status-dot.degraded, .status-dot.setup_required, .status-dot.starting, .status-dot.restarting { background: var(--warning); box-shadow: 0 0 0 4px rgba(241,182,75,.13); }
.status-dot.stopped { background: var(--danger); box-shadow: 0 0 0 4px rgba(237,106,106,.12); }

.shell { display: grid; grid-template-columns: 220px minmax(0, 1fr); min-height: calc(100vh - 76px); }
.sidebar { border-right: 1px solid var(--border); padding: 22px 14px; background: rgba(11, 22, 32, .82); display: flex; flex-direction: column; gap: 6px; }
.nav-button { border: 0; background: transparent; color: var(--muted); padding: 11px 13px; text-align: left; border-radius: 9px; transition: .15s ease; }
.nav-button:hover { color: var(--text); background: var(--surface-2); }
.nav-button.active { color: var(--text); background: linear-gradient(90deg, rgba(49,182,212,.18), rgba(49,182,212,.04)); box-shadow: inset 3px 0 var(--primary); }
.sidebar-bottom { margin-top: auto; padding: 14px 8px 4px; border-top: 1px solid var(--border); }
.sidebar-bottom label { font-size: 11px; color: var(--muted); display: block; margin-bottom: 7px; }
.sidebar-bottom input { width: 100%; }
.sidebar-bottom small { display: block; color: var(--muted); line-height: 1.35; margin-top: 8px; }

.content { padding: 30px; min-width: 0; }
.page { display: none; max-width: 1440px; margin: 0 auto; }
.page.active { display: block; animation: enter .18s ease-out; }
@keyframes enter { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.page-heading, .section-heading { justify-content: space-between; gap: 24px; margin-bottom: 22px; }
.page-heading h2 { margin: 2px 0 4px; font-size: 27px; letter-spacing: -.025em; }
.page-heading p, .section-heading p { color: var(--muted); margin: 0; }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; font-size: 10px; color: var(--primary) !important; font-weight: 800; }
.control-row { gap: 9px; flex-wrap: wrap; justify-content: flex-end; }
.section-heading { margin: 30px 0 14px; }
.section-heading h3 { margin: 0 0 4px; }

.button { border: 1px solid transparent; border-radius: 8px; padding: 9px 15px; color: #061016; background: var(--primary); font-weight: 700; transition: .15s ease; }
.button:hover:not(:disabled) { filter: brightness(1.08); transform: translateY(-1px); }
.button:disabled { cursor: not-allowed; opacity: .4; }
.button.primary { background: var(--primary); }
.button.success { background: var(--success); }
.button.danger { background: transparent; border-color: rgba(237,106,106,.6); color: #ff9a9a; }
.button.secondary { background: var(--surface-3); border-color: var(--border); color: var(--text); }
.button.ghost { background: transparent; color: var(--muted); border-color: var(--border); }
.button.compact { padding: 7px 10px; font-size: 12px; margin-top: 7px; }

.banner { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 14px 16px; border: 1px solid var(--border); border-radius: 10px; margin-bottom: 22px; background: var(--surface); }
.banner > div strong, .banner > div span { display: block; }
.banner span { color: var(--muted); font-size: 13px; margin-top: 3px; }
.banner.warning { border-color: rgba(241,182,75,.42); background: rgba(241,182,75,.08); }
.banner.neutral { background: var(--surface-2); }
.hidden { display: none !important; }

.metric-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 13px; margin-bottom: 16px; }
.metric-card, .panel { background: linear-gradient(145deg, rgba(21,36,51,.95), rgba(14,26,37,.96)); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow); }
.metric-card { padding: 17px; }
.metric-card span { color: var(--muted); font-size: 12px; }
.metric-card strong { display: block; font-size: 22px; margin: 8px 0 3px; text-transform: capitalize; }
.metric-card small { color: var(--muted); }
.dashboard-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 16px; }
.panel { padding: 19px; min-width: 0; }
.panel.wide, .panel.full { grid-column: 1 / -1; }
.panel-heading { justify-content: space-between; gap: 16px; margin-bottom: 17px; }
.panel-heading h3 { margin: 0 0 4px; font-size: 16px; }
.panel-heading p { margin: 0; color: var(--muted); font-size: 12px; }
.empty-state { color: var(--muted); padding: 24px 8px; text-align: center; }

.sim-status-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 10px; }
.sim-status-card { border: 1px solid var(--border); border-radius: 9px; background: rgba(7,15,22,.42); padding: 13px; }
.sim-status-card h4 { margin: 0 0 11px; font-size: 14px; }
.sim-status-card dl { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; margin: 0; }
.sim-status-card dt { color: var(--muted); font-size: 10px; text-transform: uppercase; letter-spacing: .08em; }
.sim-status-card dd { margin: 3px 0 0; font-size: 12px; overflow-wrap: anywhere; }

.issue-list { display: grid; gap: 8px; max-height: 360px; overflow: auto; }
.issue { border-left: 3px solid var(--warning); padding: 9px 11px; background: rgba(241,182,75,.06); border-radius: 5px; font-size: 12px; line-height: 1.4; }
.issue.error { border-color: var(--danger); background: rgba(237,106,106,.07); }
.detail-list { margin: 0; }
.detail-list > div { display: flex; justify-content: space-between; gap: 15px; padding: 10px 0; border-bottom: 1px solid rgba(41,64,84,.65); }
.detail-list > div:last-child { border-bottom: 0; }
.detail-list dt { color: var(--muted); }
.detail-list dd { margin: 0; text-align: right; overflow-wrap: anywhere; }

label { color: var(--muted); font-size: 12px; }
input, select { display: block; width: 100%; border: 1px solid var(--border); border-radius: 7px; background: #0a151f; color: var(--text); padding: 9px 10px; margin-top: 6px; outline: none; }
input:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(49,182,212,.1); }
input[type="checkbox"] { width: 17px; height: 17px; margin: 0; accent-color: var(--primary); }
.form-grid { display: grid; gap: 15px; }
.form-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.form-grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.form-span { grid-column: 1 / -1; }
.stack-form { display: grid; gap: 14px; }
.form-actions { margin-top: 18px; display: flex; justify-content: flex-end; }
.simulator-editors { display: grid; gap: 13px; }
.sim-editor { position: relative; }
.sim-editor .remove-simulator { position: absolute; top: 14px; right: 14px; }
.advanced-grid { margin-top: 15px; padding-top: 15px; border-top: 1px solid var(--border); }
.checkbox-row, .toggle-row { display: flex; align-items: center; gap: 10px; }
.checkbox-row { align-self: end; min-height: 42px; }
.toggle-row { padding: 11px 0; }
.toggle-row span, .toggle-row strong, .toggle-row small { display: block; }
.toggle-row small { color: var(--muted); margin-top: 3px; }
.certificate-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.narrow-panel { max-width: 660px; }
fieldset { border: 1px solid var(--border); border-radius: 8px; padding: 13px; }
legend { color: var(--muted); font-size: 12px; padding: 0 5px; }
.weekday-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 7px; }
.weekday-grid label { text-align: center; border: 1px solid var(--border); padding: 9px 4px; border-radius: 6px; }
.weekday-grid input { margin: 0 auto 5px; }
.callout { color: var(--warning); background: rgba(241,182,75,.08); padding: 10px; border-radius: 7px; font-size: 12px; }

.log-panel { padding: 0; overflow: hidden; }
.log-panel pre { margin: 0; min-height: 520px; max-height: calc(100vh - 220px); overflow: auto; background: #050b10; padding: 18px; color: #bad1dc; font: 12px/1.55 "Cascadia Mono", Consolas, monospace; white-space: pre-wrap; word-break: break-word; }
.toast { position: fixed; right: 24px; bottom: 24px; z-index: 50; max-width: 430px; padding: 12px 15px; border-radius: 9px; background: var(--surface-3); border: 1px solid var(--border); box-shadow: var(--shadow); transform: translateY(20px); opacity: 0; pointer-events: none; transition: .18s ease; }
.toast.visible { transform: none; opacity: 1; }
.toast.error { border-color: var(--danger); }

@media (max-width: 1000px) {
  .metric-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .dashboard-grid, .certificate-grid { grid-template-columns: 1fr; }
  .panel.wide, .panel.full { grid-column: auto; }
  .form-grid.three { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 720px) {
  .topbar { padding: 0 16px; }
  .brand p { display: none; }
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: sticky; top: 76px; z-index: 15; flex-direction: row; overflow-x: auto; border-right: 0; border-bottom: 1px solid var(--border); padding: 8px; }
  .nav-button { white-space: nowrap; }
  .sidebar-bottom { display: none; }
  .content { padding: 18px 14px; }
  .page-heading { align-items: flex-start; flex-direction: column; }
  .control-row { justify-content: flex-start; }
  .form-grid.two, .form-grid.three, .metric-grid { grid-template-columns: 1fr; }
  .weekday-grid { grid-template-columns: repeat(4, 1fr); }
}