/* =========================================================================
   SidebarsAI C2 — design system + layout
   ========================================================================= */

:root {
    --navy-950:    #060f1e;
    --navy-900:    #0C1F3A;
    --navy-800:    #0f2847;
    --navy-700:    #1a3a5c;
    --navy-600:    #1e4976;
    --sage:        #7EC8B0;
    --sage-dim:    #4a8a78;
    --sage-glow:   rgba(126, 200, 176, 0.12);
    --amber:       #EF9F27;
    --amber-glow:  rgba(239, 159, 39, 0.15);
    --red:         #E24B4A;
    --red-glow:    rgba(226, 75, 74, 0.15);
    --blue:        #4a9eff;
    --blue-glow:   rgba(74, 158, 255, 0.15);
    --ivory:       #F7F5F0;
    --ivory-dim:   #b8b4ab;
    --ivory-muted: #6b6760;

    --font-display: 'Playfair Display', 'Times New Roman', serif;
    --font-ui: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'IBM Plex Mono', 'Menlo', 'Consolas', monospace;

    --radius-sm: 4px;
    --radius: 8px;
    --radius-lg: 12px;

    --topbar-h: 56px;
    --sidenav-w: 220px;

    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.25);
    --shadow-pop:  0 8px 24px rgba(0, 0, 0, 0.35);
}

*,
*::before,
*::after { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    height: 100%;
    background: var(--navy-950);
    color: var(--ivory);
    font-family: var(--font-ui);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--sage);
    text-decoration: none;
}
a:hover { color: var(--sage); filter: brightness(1.15); }

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    margin: 0 0 0.4em;
    color: var(--ivory);
    letter-spacing: 0.01em;
}
h1 { font-size: 24px; }
h2 { font-size: 20px; }
h3 { font-size: 17px; }
h4 { font-size: 15px; }

.mono { font-family: var(--font-mono); }
.ivory-dim { color: var(--ivory-dim); }
.ivory-muted { color: var(--ivory-muted); }

::selection { background: var(--sage-glow); color: var(--ivory); }

/* =========================================================================
   Login page
   ========================================================================= */

.login-shell {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 24px;
    background:
        radial-gradient(circle at 20% 10%, var(--sage-glow), transparent 50%),
        radial-gradient(circle at 80% 90%, var(--amber-glow), transparent 55%),
        var(--navy-950);
}
.login-card {
    width: 100%;
    max-width: 400px;
    background: var(--navy-900);
    border: 1px solid var(--navy-700);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-pop);
}
.login-brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    margin-bottom: 24px;
}
.login-logo { width: 48px; height: 48px; }
.login-title {
    font-family: var(--font-display);
    font-size: 24px;
    margin: 4px 0 0;
}
.login-sub {
    color: var(--ivory-muted);
    margin: 0;
    font-size: 13px;
}
.login-form { display: flex; flex-direction: column; gap: 14px; }
.field { display: flex; flex-direction: column; gap: 4px; }
.field-label { font-size: 12px; color: var(--ivory-dim); }
.field input,
.field select,
.field textarea {
    background: var(--navy-800);
    border: 1px solid var(--navy-700);
    border-radius: var(--radius);
    padding: 9px 12px;
    color: var(--ivory);
    font-family: var(--font-ui);
    font-size: 14px;
    outline: none;
    transition: border-color 120ms;
}
.field input:focus,
.field select:focus,
.field textarea:focus { border-color: var(--sage-dim); }

.login-error {
    color: var(--red);
    font-size: 13px;
    min-height: 18px;
}
.login-footer {
    margin-top: 20px;
    text-align: center;
    color: var(--ivory-muted);
    font-size: 11px;
}

/* =========================================================================
   App shell
   ========================================================================= */

.app-shell {
    display: flex;
    flex-direction: column;
    height: 100vh;
    min-height: 0;
}

.topbar {
    height: var(--topbar-h);
    background: var(--navy-900);
    border-bottom: 1px solid var(--navy-800);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    flex-shrink: 0;
    z-index: 5;
}
.topbar-left { display: flex; align-items: center; gap: 32px; }
.brand { display: flex; align-items: baseline; gap: 8px; color: var(--ivory); }
.brand-logo { width: 24px; height: 24px; align-self: center; }
.brand-name { font-family: var(--font-display); font-weight: 600; font-size: 17px; }
.brand-sub {
    font-family: var(--font-mono);
    color: var(--ivory-muted);
    font-size: 11px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.fleet-summary {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    color: var(--ivory-dim);
}
.fleet-summary .sep { color: var(--navy-600); }
.fleet-summary .count { font-family: var(--font-mono); font-weight: 500; color: var(--ivory); }
.fleet-summary .label-online .count { color: var(--sage); }
.fleet-summary .label-warning .count { color: var(--amber); }
.fleet-summary .label-critical .count { color: var(--red); }
.fleet-summary .label-offline .count { color: var(--red); }
.fleet-summary .label-alerts .count { color: var(--amber); }

.topbar-right { display: flex; align-items: center; gap: 12px; }
.user-email { color: var(--ivory-dim); font-size: 12px; }

.app-body {
    display: flex;
    flex: 1;
    min-height: 0;
}

.sidenav {
    width: var(--sidenav-w);
    background: var(--navy-900);
    border-right: 1px solid var(--navy-800);
    padding: 16px 10px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: var(--radius);
    color: var(--ivory-dim);
    font-size: 14px;
    transition: background 120ms, color 120ms;
    position: relative;
}
.nav-item:hover { background: var(--navy-800); color: var(--ivory); }
.nav-item.active { background: var(--navy-800); color: var(--ivory); }
.nav-item .nav-icon {
    width: 20px;
    text-align: center;
    color: var(--sage-dim);
    font-family: var(--font-mono);
    font-size: 14px;
}
.nav-item.active .nav-icon { color: var(--sage); }
.nav-badge {
    margin-left: auto;
    background: var(--red);
    color: var(--ivory);
    font-size: 11px;
    font-family: var(--font-mono);
    padding: 1px 6px;
    border-radius: 10px;
    min-width: 20px;
    text-align: center;
}

.main-content {
    flex: 1;
    min-width: 0;
    overflow-y: auto;
    padding: 24px 28px;
}
.loading-shell {
    color: var(--ivory-muted);
    padding: 40px;
    text-align: center;
}

/* =========================================================================
   Utility layout
   ========================================================================= */

.page-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 20px;
}
.page-head h1 { margin: 0; }
.row { display: flex; gap: 16px; align-items: center; }
.row-wrap { display: flex; gap: 16px; flex-wrap: wrap; }
.col { display: flex; flex-direction: column; gap: 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
.spacer { flex: 1; }

.hidden { display: none !important; }
.divider { height: 1px; background: var(--navy-800); margin: 16px 0; }

@media (max-width: 900px) {
    .grid-2 { grid-template-columns: 1fr; }
    :root { --sidenav-w: 72px; }
    .nav-item span:not(.nav-icon):not(.nav-badge) { display: none; }
}