:root {
    color-scheme: light;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    --app: #f3f6fa;
    --nav: #f8fafd;
    --panel: #ffffff;
    --secondary: #f7f9fc;
    --border: #dde5ef;
    --border-strong: #c9d4e3;
    --text: #18243a;
    --muted: #65738a;
    --primary: #0866c2;
    --primary-hover: #0755a1;
    --primary-soft: #e7f3ff;
    --button-primary: #0866c2;
    --button-primary-hover: #0755a1;
    --cyan: #087c8b;
    --success: #117a4d;
    --success-soft: #e6f7ef;
    --warning: #985908;
    --warning-soft: #fff4e3;
    --danger: #b4232f;
    --danger-hover: #8f1d28;
    --button-danger: #a62632;
    --button-danger-hover: #861e29;
    --danger-soft: #ffeded;
    --shadow: 0 12px 32px rgb(40 61 89 / 8%);
    --sidebar-width: 196px;
    --topbar-height: 64px;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --app: #07111f;
    --nav: #081426;
    --panel: #0e1a2b;
    --secondary: #122236;
    --border: #24364d;
    --border-strong: #344a65;
    --text: #e8eef7;
    --muted: #93a4ba;
    --primary: #7aa7ff;
    --primary-hover: #a4c2ff;
    --primary-soft: #132a50;
    --button-primary: #2457c5;
    --button-primary-hover: #1c469f;
    --cyan: #49d0e5;
    --success: #56d79a;
    --success-soft: #11372c;
    --warning: #ffc36a;
    --warning-soft: #3a2a17;
    --danger: #ff8f96;
    --danger-hover: #ffb1b6;
    --button-danger: #9e2631;
    --button-danger-hover: #7d1d27;
    --danger-soft: #3d2027;
    --shadow: 0 18px 42px rgb(0 0 0 / 24%);
}

@media (prefers-color-scheme: dark) {
    :root[data-theme="system"] {
        color-scheme: dark;
        --app: #07111f;
        --nav: #081426;
        --panel: #0e1a2b;
        --secondary: #122236;
        --border: #24364d;
        --border-strong: #344a65;
        --text: #e8eef7;
        --muted: #93a4ba;
        --primary: #7aa7ff;
        --primary-hover: #a4c2ff;
        --primary-soft: #132a50;
        --button-primary: #2457c5;
        --button-primary-hover: #1c469f;
        --cyan: #49d0e5;
        --success: #56d79a;
        --success-soft: #11372c;
        --warning: #ffc36a;
        --warning-soft: #3a2a17;
        --danger: #ff8f96;
        --danger-hover: #ffb1b6;
        --button-danger: #9e2631;
        --button-danger-hover: #7d1d27;
        --danger-soft: #3d2027;
        --shadow: 0 18px 42px rgb(0 0 0 / 24%);
    }
}

* { box-sizing: border-box; }
html { min-width: 320px; background: var(--app); }
body { margin: 0; min-height: 100vh; color: var(--text); background: var(--app); line-height: 1.55; }
button, input, select, textarea { font: inherit; }
a { color: var(--primary); text-underline-offset: 3px; }
a:hover { color: var(--primary-hover); }
h1, h2, h3 { color: var(--text); line-height: 1.25; }
h1 { margin: 0 0 .35rem; font-size: clamp(1.65rem, 2.4vw, 2.15rem); letter-spacing: -.02em; }
h2 { margin: 1.6rem 0 .8rem; font-size: 1.15rem; }
h3 { margin: 0 0 .65rem; font-size: 1rem; }
p { margin: .55rem 0; }
small { color: var(--muted); }

.visually-hidden { position: absolute !important; width: 1px !important; height: 1px !important; padding: 0 !important; margin: -1px !important; overflow: hidden !important; clip: rect(0, 0, 0, 0) !important; white-space: nowrap !important; border: 0 !important; }
.skip-link { position: fixed; left: 1rem; top: -5rem; z-index: 1000; padding: .65rem .9rem; color: var(--text); background: var(--panel); border: 1px solid var(--primary); border-radius: .55rem; }
.skip-link:focus { top: 1rem; }

.app-shell { display: grid; grid-template-columns: var(--sidebar-width) minmax(0, 1fr); min-height: 100vh; }
.sidebar { position: sticky; top: 0; z-index: 30; display: flex; flex-direction: column; width: var(--sidebar-width); height: 100vh; padding: 0 12px 18px; background: var(--nav); border-right: 1px solid var(--border); }
.brand { display: flex; align-items: center; gap: .72rem; min-height: var(--topbar-height); color: var(--text); text-decoration: none; }
.brand:hover { color: var(--text); }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; flex: 0 0 34px; color: #fff; background: var(--button-primary); border-radius: 10px; box-shadow: 0 8px 18px rgb(22 135 248 / 23%); font-size: 1.1rem; }
.brand strong, .brand small { display: block; }
.brand strong { letter-spacing: .01em; }
.brand small { margin-top: -2px; font-size: .7rem; font-weight: 600; }
.side-nav { display: flex; flex-direction: column; gap: 4px; margin-top: 18px; }
.side-nav a { display: flex; align-items: center; gap: .72rem; min-height: 42px; padding: 0 .78rem; color: var(--muted); text-decoration: none; border: 1px solid transparent; border-radius: 9px; font-size: .9rem; font-weight: 600; transition: color .15s ease, background .15s ease, border-color .15s ease; }
.side-nav a i { width: 18px; color: currentColor; font-size: 1rem; text-align: center; }
.side-nav a:hover { color: var(--text); background: var(--secondary); }
.side-nav a.active { color: var(--primary); background: var(--primary-soft); border-color: color-mix(in srgb, var(--primary) 22%, transparent); }
.sidebar-note { display: flex; gap: .65rem; align-items: flex-start; margin-top: auto; padding: .8rem; color: var(--muted); background: var(--secondary); border: 1px solid var(--border); border-radius: 10px; }
.sidebar-note i { color: var(--success); }
.sidebar-note strong, .sidebar-note small { display: block; }
.sidebar-note strong { color: var(--text); font-size: .75rem; }
.sidebar-note small { margin-top: 2px; font-size: .66rem; line-height: 1.4; }

.workspace { min-width: 0; display: flex; flex-direction: column; min-height: 100vh; }
.topbar { position: sticky; top: 0; z-index: 40; display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: var(--topbar-height); padding: 0 clamp(1rem, 2vw, 2rem); background: color-mix(in srgb, var(--app) 90%, transparent); border-bottom: 1px solid var(--border); backdrop-filter: blur(14px); }
.topbar-context, .topbar-actions { display: flex; align-items: center; gap: .7rem; min-width: 0; }
.topbar-actions { justify-content: flex-end; }
.environment-label { color: var(--muted); font-size: .83rem; white-space: nowrap; }
.environment-label i { color: var(--cyan); margin-right: .3rem; }
.operator { display: flex; align-items: center; gap: .45rem; max-width: 160px; color: var(--muted); font-size: .8rem; }
.operator span { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.operator i { color: var(--primary); font-size: 1.05rem; }
.logout-form { margin: 0; }
.theme-control { display: flex; align-items: center; gap: .35rem; min-height: 36px; padding: 0 .42rem 0 .65rem; color: var(--muted); background: var(--secondary); border: 1px solid var(--border); border-radius: 8px; font-size: .78rem; font-weight: 500; }
.theme-control select { width: auto; min-width: 82px; padding: .25rem 1.4rem .25rem .25rem; color: var(--text); background-color: transparent; border: 0; box-shadow: none; }
.theme-control select:focus { outline: 2px solid var(--primary); outline-offset: 2px; }
.icon-button { display: inline-grid; place-items: center; width: 36px; height: 36px; padding: 0; color: var(--muted); background: var(--secondary); border: 1px solid var(--border); border-radius: 8px; cursor: pointer; }
.icon-button:hover { color: var(--text); border-color: var(--border-strong); }
.sidebar-toggle { display: none; }
.emergency-button { display: inline-flex; align-items: center; gap: .45rem; min-height: 36px; padding: 0 .78rem; color: #fff; background: var(--button-danger); border: 1px solid var(--button-danger); border-radius: 8px; text-decoration: none; font-size: .8rem; font-weight: 700; white-space: nowrap; box-shadow: 0 7px 18px color-mix(in srgb, var(--button-danger) 30%, transparent); }
.emergency-button:hover { color: #fff; background: var(--button-danger-hover); border-color: var(--button-danger-hover); }

.content { width: min(100%, 1480px); margin: 0 auto; padding: clamp(1.25rem, 2.4vw, 2.25rem); flex: 1; }
.page-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 1rem; margin-bottom: 1.2rem; }
.eyebrow { display: inline-flex; align-items: center; gap: .4rem; margin-bottom: .5rem; color: var(--primary); font-size: .76rem; font-weight: 750; letter-spacing: .03em; text-transform: uppercase; }
.data-time { color: var(--muted); font-size: .74rem; white-space: nowrap; }
.subtitle { margin-top: 0; color: var(--muted); max-width: 72ch; }
footer { padding: 1rem 1.5rem 1.3rem; color: var(--muted); text-align: center; font-size: .72rem; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(185px, 1fr)); gap: .85rem; }
.card, .panel { color: var(--text); background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 1rem; box-shadow: var(--shadow); }
.card { min-height: 106px; }
.card .metric { margin: .25rem 0; }
.dashboard-metrics { grid-template-columns: repeat(6, minmax(150px, 1fr)); }
.metric-card { display: flex; align-items: flex-start; gap: .8rem; min-width: 0; }
.metric-card > div { min-width: 0; }
.metric-card span:not(.metric):not(.metric-icon), .metric-card small { display: block; }
.metric-icon { display: inline-grid; place-items: center; width: 36px; height: 36px; flex: 0 0 36px; color: var(--muted); background: var(--secondary); border: 1px solid var(--border); border-radius: 10px; }
.metric-icon.primary { color: var(--primary); background: var(--primary-soft); border-color: color-mix(in srgb, var(--primary) 25%, var(--border)); }
.metric-icon.success { color: var(--success); background: var(--success-soft); border-color: color-mix(in srgb, var(--success) 25%, var(--border)); }
.metric-icon.warning { color: var(--warning); background: var(--warning-soft); border-color: color-mix(in srgb, var(--warning) 25%, var(--border)); }
.metric-icon.danger { color: var(--danger); background: var(--danger-soft); border-color: color-mix(in srgb, var(--danger) 25%, var(--border)); }
.metric-icon.cyan { color: var(--cyan); background: color-mix(in srgb, var(--cyan) 13%, var(--panel)); border-color: color-mix(in srgb, var(--cyan) 25%, var(--border)); }
.metric { display: block; color: var(--text); font-size: clamp(1.7rem, 3vw, 2.1rem); line-height: 1.05; font-weight: 750; letter-spacing: -.035em; }
.danger { color: var(--danger) !important; }
.success { color: var(--success) !important; }

.actions { display: flex; align-items: center; gap: .65rem; flex-wrap: wrap; margin: 1rem 0; }
.actions h2 { margin: 0 auto 0 0; }
.ai-command-panel { margin: 1rem 0 1.4rem; padding: 1rem 1.1rem .85rem; background: var(--panel); border: 1px solid color-mix(in srgb, var(--primary) 30%, var(--border)); border-radius: 13px; box-shadow: var(--shadow); }
.ai-command-copy { display: flex; align-items: flex-start; gap: .85rem; }
.ai-command-copy h2 { margin: .1rem 0 .25rem; }
.ai-command-copy p { margin: 0; color: var(--muted); }
.quick-ai-form { display: grid; grid-template-columns: minmax(160px, .7fr) minmax(210px, 1fr) minmax(300px, 2fr) auto; gap: .7rem; align-items: end; margin: .9rem 0 .65rem; }
.quick-ai-form label { margin-bottom: .3rem; font-size: .72rem; }
.quick-ai-form textarea { min-height: 68px; max-height: 150px; }
.quick-ai-form button { min-height: 42px; margin-bottom: 1px; }
.compact-actions { margin: .45rem 0 .75rem; }
.constraint-row { display: flex; align-items: center; gap: .55rem 1.2rem; flex-wrap: wrap; padding-top: .7rem; color: var(--muted); border-top: 1px solid var(--border); font-size: .75rem; }
.constraint-row i { margin-right: .28rem; color: var(--success); }
.platform-grid { grid-template-columns: repeat(3, minmax(220px, 1fr)); }
.platform-title { display: flex; align-items: center; gap: .7rem; }
.platform-title h3 { margin: 0; }
.button, button:not(.icon-button) { display: inline-flex; align-items: center; justify-content: center; gap: .4rem; min-height: 38px; padding: .5rem .9rem; color: #fff; background: var(--button-primary); border: 1px solid var(--button-primary); border-radius: 8px; text-decoration: none; cursor: pointer; font: inherit; font-size: .87rem; font-weight: 650; }
.button:hover, button:not(.icon-button):hover { color: #fff; background: var(--button-primary-hover); border-color: var(--button-primary-hover); }
.button.secondary { color: var(--text); background: var(--secondary); border-color: var(--border); }
.button.secondary:hover { color: var(--primary); background: var(--primary-soft); border-color: color-mix(in srgb, var(--primary) 35%, var(--border)); }
.button.danger-button, button.danger-button { color: #fff; background: var(--button-danger); border-color: var(--button-danger); }
.button.danger-button:hover, button.danger-button:hover { background: var(--button-danger-hover); border-color: var(--button-danger-hover); }

.warning-box, .error-box { margin: 1rem 0; padding: .9rem 1rem; color: var(--text); background: var(--warning-soft); border: 1px solid color-mix(in srgb, var(--warning) 45%, var(--border)); border-left: 4px solid var(--warning); border-radius: 9px; }
.error-box { background: var(--danger-soft); border-color: color-mix(in srgb, var(--danger) 45%, var(--border)); border-left-color: var(--danger); }
.warning-box h2, .error-box h2 { margin-top: 0; }

.table-wrap { overflow-x: auto; background: var(--panel); border: 1px solid var(--border); border-radius: 12px; box-shadow: var(--shadow); }
table { width: 100%; border-collapse: collapse; color: var(--text); background: transparent; font-size: .84rem; }
th, td { padding: .72rem .78rem; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
th { color: var(--muted); background: var(--secondary); font-size: .74rem; font-weight: 700; letter-spacing: .01em; white-space: nowrap; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover td { background: color-mix(in srgb, var(--primary-soft) 45%, transparent); }
.status { display: inline-flex; align-items: center; min-height: 24px; padding: .12rem .55rem; color: var(--muted); background: var(--secondary); border: 1px solid var(--border); border-radius: 999px; font-size: .73rem; font-weight: 700; }
.status.online { color: var(--success); background: var(--success-soft); border-color: color-mix(in srgb, var(--success) 30%, var(--border)); }
.status.failed { color: var(--danger); background: var(--danger-soft); border-color: color-mix(in srgb, var(--danger) 30%, var(--border)); }

fieldset { margin: 1rem 0; padding: 1rem; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; }
legend { padding: 0 .4rem; color: var(--text); font-weight: 700; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; }
label { display: block; color: var(--text); font-weight: 650; font-size: .85rem; }
input[type="text"], input[type="password"], input[type="number"], input[type="datetime-local"], select, textarea { width: 100%; padding: .58rem .68rem; color: var(--text); background: var(--secondary); border: 1px solid var(--border-strong); border-radius: 7px; outline: 0; }
input:focus, select:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px color-mix(in srgb, var(--primary) 17%, transparent); }
textarea { min-height: 7rem; resize: vertical; }
.check { display: flex; gap: .55rem; align-items: flex-start; margin: .45rem 0; font-weight: 400; }
.check input { margin-top: .3rem; accent-color: var(--primary); }
.field-validation-error, .validation-summary-errors { color: var(--danger); }
.field-validation-error { display: block; margin-top: .25rem; font-size: .78rem; }

pre { max-height: 30rem; overflow: auto; padding: 1rem; color: #e8eef7; background: #07111f; border: 1px solid #24364d; border-radius: 9px; white-space: pre-wrap; word-break: break-word; }
.timeline { list-style: none; padding: 0; }
.timeline li { position: relative; margin-left: .5rem; padding: 0 0 1.25rem 1.15rem; border-left: 2px solid var(--border-strong); }
.timeline li::before { content: ""; position: absolute; left: -6px; top: .35rem; width: 10px; height: 10px; background: var(--primary); border: 2px solid var(--panel); border-radius: 50%; }

.auth-body { display: flex; flex-direction: column; min-height: 100vh; }
.auth-header { display: flex; align-items: center; justify-content: space-between; min-height: 72px; padding: 0 clamp(1rem, 4vw, 3rem); background: var(--nav); border-bottom: 1px solid var(--border); }
.auth-content { width: min(100%, 560px); margin: auto; padding: 2rem 1rem; }
.login-panel { margin: 0; padding: clamp(1.25rem, 4vw, 2.2rem); }
.login-panel h1 { text-align: center; }

.sidebar-scrim { display: none; }

@media (max-width: 980px) {
    .app-shell { grid-template-columns: 1fr; }
    .sidebar { position: fixed; left: 0; z-index: 50; transform: translateX(-105%); transition: transform .2s ease; box-shadow: 18px 0 45px rgb(0 0 0 / 25%); }
    .sidebar-open .sidebar { transform: translateX(0); }
    .sidebar-toggle { display: inline-grid; }
    .dashboard-metrics { grid-template-columns: repeat(3, minmax(150px, 1fr)); }
    .quick-ai-form { grid-template-columns: 1fr 1fr; }
    .quick-problem { grid-column: 1 / -1; }
    button.sidebar-scrim { position: fixed; inset: 0; z-index: 35; display: block; width: 100%; height: 100%; min-height: 0; padding: 0; background: rgb(0 0 0 / 52%); border: 0; border-radius: 0; box-shadow: none; opacity: 0; pointer-events: none; transition: opacity .2s ease; }
    .sidebar-open button.sidebar-scrim { opacity: 1; pointer-events: auto; }
}

@media (max-width: 720px) {
    .topbar { padding: 0 .75rem; }
    .environment-label, .operator span, .theme-control i { display: none; }
    .theme-control { padding-left: .3rem; }
    .emergency-button { padding: 0 .62rem; }
    .content { padding: 1rem .75rem 1.5rem; }
    .page-heading { display: block; }
    .data-time { white-space: normal; }
    .grid { grid-template-columns: 1fr 1fr; }
    .dashboard-metrics, .platform-grid { grid-template-columns: 1fr 1fr; }
    .quick-ai-form { grid-template-columns: 1fr; }
    .quick-problem { grid-column: auto; }
    .form-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .grid { grid-template-columns: 1fr; }
    .dashboard-metrics, .platform-grid { grid-template-columns: 1fr; }
    .auth-header .brand small { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}