:root {
    --primary-color: #8b5cf6;
    --primary-dark: #7c3aed;
    --secondary-color: #0c0c0c;
    --accent-color: #06b6d4;
    --dark-bg: #000000;
    --card-bg: #111111;
    --text-light: #ffffff;
    --text-muted: #a1a1aa;
    --danger-color: #f43f5e;
    --success-color: #10b981;
    --border-color: #27272a;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-light);
    min-height: 100vh;
}

.navbar {
    background: var(--dark-bg) !important;
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.navbar-brand {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-light) !important;
    letter-spacing: -0.5px;
}

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

.nav-link {
    color: var(--text-muted) !important;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-light) !important;
}

.hero-section {
    background: var(--dark-bg);
    padding: 4rem 0;
    min-height: 85vh;
    display: flex;
    align-items: center;
}

.hero-section h1 {
    font-size: 2.75rem;
    font-weight: 800;
    color: var(--text-light);
    margin-bottom: 1.25rem;
    letter-spacing: -1px;
    line-height: 1.1;
}

.hero-section .lead {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.7;
}

.feature-badges .badge {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: 999px;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
}

.badge-encrypt {
    border-color: var(--primary-color) !important;
    color: var(--primary-color) !important;
}

.badge-burn {
    border-color: var(--danger-color) !important;
    color: var(--danger-color) !important;
}

.badge-once {
    border-color: var(--accent-color) !important;
    color: var(--accent-color) !important;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    box-shadow: none;
}

.card-title {
    color: var(--text-light);
    font-weight: 700;
    font-size: 1.25rem;
}

.form-control, .form-select {
    background-color: var(--dark-bg);
    border: 1px solid var(--border-color);
    color: var(--text-light);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
}

.form-control:focus, .form-select:focus {
    background-color: var(--dark-bg);
    border-color: var(--primary-color);
    color: var(--text-light);
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.15);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-label {
    color: var(--text-light);
    font-weight: 500;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.form-text {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.btn-primary {
    background: var(--primary-color);
    border: none;
    padding: 0.875rem 1.5rem;
    font-weight: 600;
    font-size: 1rem;
    border-radius: 0.5rem;
    transition: all 0.2s ease;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-light);
    font-weight: 500;
}

.btn-secondary:hover {
    background: var(--card-bg);
    border-color: var(--text-muted);
    color: var(--text-light);
}

.features-section {
    background: var(--dark-bg);
    padding: 4rem 0;
    border-top: 1px solid var(--border-color);
}

.features-section h2 {
    color: var(--text-light);
    font-weight: 700;
    font-size: 1.75rem;
    margin-bottom: 2rem;
}

.features-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.features-list li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.features-list li:last-child {
    border-bottom: none;
}

.features-list .feature-icon {
    width: 40px;
    height: 40px;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.features-list .feature-icon.purple {
    background: rgba(139, 92, 246, 0.15);
    color: var(--primary-color);
}

.features-list .feature-icon.red {
    background: rgba(244, 63, 94, 0.15);
    color: var(--danger-color);
}

.features-list .feature-icon.cyan {
    background: rgba(6, 182, 212, 0.15);
    color: var(--accent-color);
}

.features-list h4 {
    color: var(--text-light);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.features-list p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0;
}

.seo-content-section {
    background: var(--card-bg);
    padding: 4rem 0;
    border-top: 1px solid var(--border-color);
}

.seo-content-section h2, .seo-content-section h3 {
    color: var(--text-light);
    font-weight: 600;
}

.seo-content-section h2 {
    font-size: 1.5rem;
}

.seo-content-section h3 {
    font-size: 1.2rem;
}

.seo-content-section p, .seo-content-section li {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

.seo-content-section strong {
    color: var(--primary-color);
}

.seo-content-section ul {
    padding-left: 1.25rem;
}

.seo-content-section li {
    margin-bottom: 0.5rem;
}

.use-cases-section {
    background: var(--dark-bg);
    padding: 4rem 0;
    border-top: 1px solid var(--border-color);
}

.use-cases-section h2 {
    color: var(--text-light);
    font-weight: 700;
    font-size: 1.75rem;
}

.use-case-card {
    background: var(--card-bg);
    border-radius: 0.75rem;
    padding: 1.5rem;
    text-align: left;
    height: 100%;
    border: 1px solid var(--border-color);
    transition: border-color 0.2s ease;
}

.use-case-card:hover {
    border-color: var(--primary-color);
}

.use-case-card i {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
    display: block;
}

.use-case-card h5 {
    color: var(--text-light);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.use-case-card p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin: 0;
}

footer {
    background: var(--dark-bg) !important;
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 2rem;
}

footer h5, footer h6 {
    color: var(--text-light) !important;
    font-weight: 600;
    font-size: 0.95rem;
}

footer p, footer small {
    font-size: 0.85rem;
}

footer a {
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--primary-color) !important;
}

.view-note-section {
    min-height: 85vh;
    display: flex;
    align-items: center;
    background: var(--dark-bg);
}

.note-card {
    background: var(--card-bg);
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.note-warning {
    background: rgba(244, 63, 94, 0.1);
    border-left: 3px solid var(--danger-color);
    color: var(--text-light);
    padding: 1rem;
    font-size: 0.9rem;
}

.note-content {
    background: var(--dark-bg);
    border-radius: 0.5rem;
    padding: 1.25rem;
    border: 1px solid var(--border-color);
    white-space: pre-wrap;
    color: var(--text-light);
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 0.9rem;
}

.faq-accordion .accordion-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    margin-bottom: 0.75rem;
    border-radius: 0.75rem !important;
    overflow: hidden;
}

.faq-accordion .accordion-button {
    background: var(--card-bg);
    color: var(--text-light);
    font-weight: 600;
    padding: 1rem 1.25rem;
    font-size: 0.95rem;
}

.faq-accordion .accordion-button:not(.collapsed) {
    background: var(--card-bg);
    color: var(--primary-color);
}

.faq-accordion .accordion-button:focus {
    box-shadow: none;
}

.faq-accordion .accordion-button::after {
    filter: brightness(0) invert(1);
}

.faq-accordion .accordion-body {
    background: var(--card-bg);
    color: var(--text-muted);
    padding: 1.25rem;
    font-size: 0.9rem;
    line-height: 1.7;
}

.about-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
}

.about-card h2 {
    color: var(--text-light);
    font-size: 1.25rem;
}

.about-card p, .about-card li {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.about-card .lead {
    color: var(--text-light);
    font-size: 1.05rem;
}

.spinner-border {
    color: var(--primary-color);
}

.alert-danger {
    background: rgba(244, 63, 94, 0.15);
    border: 1px solid var(--danger-color);
    color: var(--text-light);
    border-radius: 0.5rem;
}

.alert-success {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid var(--success-color);
    color: var(--text-light);
    border-radius: 0.5rem;
}

.alert-warning {
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid #f59e0b;
    color: var(--text-light);
    border-radius: 0.5rem;
}

@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .hero-section {
        padding: 2rem 0;
        min-height: auto;
    }
}

.bg-light {
    background: var(--card-bg) !important;
}

.bg-white {
    background: var(--card-bg) !important;
}

.text-muted {
    color: var(--text-muted) !important;
}

.bg-primary {
    background: var(--dark-bg) !important;
}

.btn-outline-secondary {
    border-color: var(--border-color);
    color: var(--text-light);
}

.btn-outline-secondary:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.input-group .btn {
    border-radius: 0 0.5rem 0.5rem 0;
}

.input-group .form-control {
    border-radius: 0.5rem 0 0 0.5rem;
}

.border-top {
    border-color: var(--border-color) !important;
}

.border-secondary {
    border-color: var(--border-color) !important;
}