:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --bg: #0f172a;
    --bg-card: #1e293b;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --border: #334155;
    --error-bg: #7f1d1d;
    --error-text: #fee2e2;
    --success: #16a34a;
}

* { box-sizing: border-box }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.5;
}

.installer {
    max-width: 720px;
    margin: 40px auto;
    padding: 0 16px;
}

.installer-header {
    text-align: center;
    padding: 16px 0 32px;
}
.installer-header h1 {
    margin: 0;
    font-size: 32px;
    letter-spacing: -0.5px;
}
.installer-header .subtitle {
    color: var(--text-muted);
    margin: 4px 0 0;
}

.installer-steps {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}
.installer-steps .step {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: 999px;
    color: var(--text-muted);
    font-size: 13px;
}
.installer-steps .step .num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px; height: 22px;
    background: var(--border);
    border-radius: 50%;
    font-weight: 600;
    font-size: 12px;
}
.installer-steps .step.active { color: var(--text); background: rgba(37,99,235,0.15) }
.installer-steps .step.active .num { background: var(--primary); color: #fff }
.installer-steps .step.done .num { background: var(--success); color: #fff }

.installer-body {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
}
.installer-body h2 {
    margin: 0 0 16px;
    font-size: 22px;
}
.installer-body p { color: var(--text-muted); }

.installer-form label {
    display: block;
    margin-bottom: 14px;
}
.installer-form label > span {
    display: block;
    margin-bottom: 4px;
    font-weight: 600;
    color: var(--text);
}
.installer-form label small {
    display: block;
    color: var(--text-muted);
    font-size: 12px;
    margin-top: 4px;
}
.installer-form input,
.installer-form select,
.installer-form textarea {
    width: 100%;
    padding: 10px 12px;
    background: #0f172a;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 14px;
    font-family: inherit;
}
.installer-form input:focus,
.installer-form select:focus,
.installer-form textarea:focus {
    outline: 2px solid var(--primary);
    outline-offset: 1px;
}

.installer-form fieldset {
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 14px 16px 4px;
    margin-bottom: 16px;
}
.installer-form fieldset legend {
    padding: 0 8px;
    font-weight: 600;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 16px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 18px;
    border-radius: 8px;
    border: none;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    color: #fff;
    background: var(--primary);
    transition: background .15s;
}
.btn:hover { background: var(--primary-dark) }
.btn[disabled] { opacity: .5; cursor: not-allowed }
.btn-large { padding: 14px 24px; font-size: 16px }

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
}
.alert-error { background: var(--error-bg); color: var(--error-text); }
.alert ul { margin: 0; padding-left: 20px; }

.checks {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
}
.checks th, .checks td {
    padding: 8px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.checks th { background: rgba(37,99,235,0.1); font-size: 13px; color: var(--text-muted); }
.checks tr.fail td { color: #fda4af; }
.checks tr.ok td { color: var(--text); }

.checklist { list-style: none; padding: 0; margin: 16px 0; }
.checklist li {
    padding: 8px 12px;
    background: rgba(22,163,74,0.1);
    border-radius: 6px;
    margin-bottom: 6px;
}

.installer-footer {
    text-align: center;
    color: var(--text-muted);
    margin-top: 24px;
}

/* Login */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}
.login-card {
    width: 100%;
    max-width: 380px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    margin: 16px;
}
.login-card h1 { margin: 0; font-size: 28px; text-align: center }
.login-card .subtitle { text-align: center; color: var(--text-muted); margin: 4px 0 16px }
.login-form label { display: block; margin-bottom: 12px }
.login-form label > span { display: block; margin-bottom: 4px; font-weight: 600 }
.login-form input {
    width: 100%;
    padding: 10px 12px;
    background: #0f172a;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 14px;
}
.login-form .btn { width: 100%; margin-top: 8px }