:root {
    --primary-color: #0ea5e9; /* Sky Blue / Cyan */
    --primary-dark: #0284c7;
    --bg-dark: #0f172a; /* Navy / Charcoal */
    --bg-light: #f8fafc;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --white: #ffffff;
    --border: #e2e8f0;
    --radius: 8px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

* { box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.5;
    margin: 0;
    padding: 0;
    background-color: var(--bg-light);
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4 {
    margin-top: 0;
    color: var(--bg-dark);
    font-weight: 700;
}

h1 { font-size: 1.875rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

main {
    padding: 2.5rem 0;
    flex: 1;
}

/* Header & Navigation */
header {
    background-color: var(--bg-dark);
    color: var(--white);
    padding: 1rem 0;
    box-shadow: var(--shadow);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.brand {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--white);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.brand span {
    color: var(--primary-color);
}

nav {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

nav a {
    color: #94a3b8;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color 0.2s;
}

nav a:hover, nav a.active {
    color: var(--white);
}

.user-zone {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: 1rem;
    padding-left: 1rem;
    border-left: 1px solid #334155;
}

/* Cards */
.card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

/* Tables */
.table-wrapper {
    overflow-x: auto;
    background: var(--white);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th {
    background-color: #f1f5f9;
    padding: 0.75rem 1rem;
    font-weight: 600;
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover td {
    background-color: #f8fafc;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
}

.btn-outline {
    border-color: var(--border);
    background-color: var(--white);
    color: var(--text-main);
}

.btn-outline:hover {
    background-color: var(--bg-light);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.625rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-ready { background-color: #dcfce7; color: #166534; }
.badge-processing { background-color: #fef9c3; color: #854d0e; }
.badge-failed { background-color: #fee2e2; color: #991b1b; }
.badge-info { background-color: #e0f2fe; color: #075985; }

/* Grid Helpers */
.grid { display: grid; gap: 1.5rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .nav-wrapper { flex-direction: column; gap: 1rem; }
}

/* Footer */
footer {
    padding: 2rem 0;
    background-color: var(--white);
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.875rem;
    text-align: center;
}

/* Units toggle (telemetry pages) */
.units-toggle {
    display: inline-flex;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--white);
    overflow: hidden;
}
.units-toggle button {
    background: transparent;
    border: none;
    padding: 0.375rem 0.875rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: background 120ms, color 120ms;
}
.units-toggle button.active {
    background: var(--primary-color);
    color: var(--white);
}
.units-toggle button:not(.active):hover {
    background: var(--bg-light);
    color: var(--text-main);
}

/* Lab Dashboard polish */
.lab-tabs { display: flex; gap: 0.25rem; border-bottom: 1px solid var(--border); margin-bottom: 0.75rem; }
.lab-tabs button {
    background: transparent;
    border: none;
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 2px solid transparent;
    cursor: pointer;
}
.lab-tabs button.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}
.lab-stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; }
.phase-pill {
    display: inline-block;
    font-size: 0.6875rem;
    padding: 0.125rem 0.5rem;
    border-radius: 999px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.phase-pill.exit { background: #fef9c3; color: #854d0e; }
.phase-pill.deployment { background: #dbeafe; color: #1d4ed8; }
.phase-pill.landing { background: #dcfce7; color: #166534; }