:root {
    --bg-dark: #0a0e17;
    --card-bg: rgba(17, 24, 39, 0.85);
    --border-color: rgba(255, 255, 255, 0.08);
    --accent: #06b6d4;
    --accent-hover: #0891b2;
    --accent-glow: rgba(6, 182, 212, 0.35);
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background: var(--bg-dark) radial-gradient(circle at 50% 10%, rgba(6, 182, 212, 0.12), transparent 60%);
    color: var(--text-main);
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px 15px;
}

.installer-container {
    width: 100%;
    max-width: 760px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(20px);
    overflow: hidden;
}

.installer-header {
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.9) 0%, rgba(30, 27, 75, 0.8) 100%);
    padding: 30px 40px;
    border-bottom: 1px solid var(--border-color);
    text-align: center;
    position: relative;
}

.logo-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 26px;
    font-weight: 800;
    color: var(--accent);
    letter-spacing: 1.5px;
    text-transform: uppercase;
}

.logo-badge span {
    color: #fff;
}

.installer-header p {
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 8px;
}

.stepper-nav {
    display: flex;
    justify-content: space-between;
    background: rgba(11, 15, 25, 0.7);
    padding: 16px 30px;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
}

.step-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
}

.step-number {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

.step-item.active {
    color: var(--accent);
}

.step-item.active .step-number {
    background: var(--accent);
    color: #000;
    border-color: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}

.step-item.completed {
    color: var(--success);
}

.step-item.completed .step-number {
    background: var(--success);
    color: #fff;
    border-color: var(--success);
}

.installer-body {
    padding: 40px;
}

.step-content {
    display: none;
}

.step-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 10px;
    color: #fff;
}

p.step-desc {
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 25px;
}

/* Requirements list */
.req-grid {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 30px;
}

.req-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 18px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 14px;
}

.badge-pass {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 5px;
}

.badge-fail {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 5px;
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: #cbd5e1;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 10px;
    color: #fff;
    font-size: 14px;
    font-family: inherit;
    transition: all 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 15px var(--accent-glow);
    background: rgba(15, 23, 42, 0.95);
}

.row-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

/* Buttons */
.btn-group-actions {
    display: flex;
    justify-content: flex-end;
    gap: 14px;
    margin-top: 30px;
}

.btn {
    padding: 12px 26px;
    font-size: 14px;
    font-weight: 700;
    border-radius: 10px;
    cursor: pointer;
    border: none;
    transition: all 0.25s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, #06b6d4 0%, #0284c7 100%);
    color: #000;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, #22d3ee 0%, #0369a1 100%);
    box-shadow: 0 6px 20px var(--accent-glow);
    transform: translateY(-1px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: #cbd5e1;
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.14);
    color: #fff;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Alerts */
.installer-alert {
    padding: 14px 18px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 14px;
    line-height: 1.5;
    display: none;
}

.installer-alert.alert-danger {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.4);
    color: #fca5a5;
    display: block;
}

.installer-alert.alert-success {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid rgba(16, 185, 129, 0.4);
    color: #6ee7b7;
    display: block;
}

/* Success screen */
.success-screen {
    text-align: center;
    padding: 20px 0;
}

.success-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
    border: 2px solid var(--success);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    margin: 0 auto 24px;
    box-shadow: 0 0 30px rgba(16, 185, 129, 0.3);
}

.credential-box {
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    text-align: left;
    margin: 25px 0;
    font-size: 14px;
}

.credential-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.credential-row:last-child {
    border-bottom: none;
}

@media (max-width: 600px) {
    .installer-body { padding: 24px 18px; }
    .installer-header { padding: 20px 18px; }
    .stepper-nav { padding: 12px 14px; }
    .row-2 { grid-template-columns: 1fr; }
}