/* SubnetCalculate - Professional Dark Theme */

:root {
    --primary-dark: #1e293b;      /* Soft slate dark */
    --primary-darker: #0f172a;    /* Deeper slate for contrast */
    --secondary-color: #64748b;   /* Muted slate */
    --accent-color: #334155;      /* Accent slate */
    --text-color: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
}

/* General Styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-white);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--text-color);
}

a {
    color: var(--text-color);
    text-decoration: underline;
}

a:hover {
    color: var(--primary-dark);
}

/* Navbar */
.navbar {
    background-color: var(--primary-dark) !important;
    padding: 1rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.25rem;
}

.navbar-dark .navbar-nav .nav-link {
    color: rgba(255,255,255,0.85);
}

.navbar-dark .navbar-nav .nav-link:hover,
.navbar-dark .navbar-nav .nav-link.active {
    color: #fff;
}

.dropdown-menu {
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.dropdown-item:hover {
    background-color: var(--bg-light);
}

/* Hero Section */
.hero-section {
    background: var(--primary-dark);
    color: white;
    padding: 3rem 0;
}

.hero-section h1 {
    color: white;
    font-size: 2.25rem;
    font-weight: 700;
}

.hero-section p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Calculator Card */
.calculator-card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
    border: 1px solid var(--border-color);
    padding: 2rem;
    margin-top: -40px;
    position: relative;
    z-index: 10;
}

.calculator-card .form-label {
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.calculator-card .form-control,
.calculator-card .form-select {
    border-radius: 6px;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.calculator-card .form-control:focus,
.calculator-card .form-select:focus {
    border-color: var(--primary-dark);
    box-shadow: 0 0 0 3px rgba(30, 41, 59, 0.15);
}

.calculator-card .btn-primary {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
}

.calculator-card .btn-primary:hover {
    background-color: var(--primary-darker);
    border-color: var(--primary-darker);
}

/* Results Section */
.results-section {
    background: var(--bg-light);
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 1.5rem;
    border: 1px solid var(--border-color);
}

.results-section h4 {
    color: var(--text-color);
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-color);
    font-size: 1.1rem;
}

.results-section h5 {
    font-size: 1rem;
    color: var(--text-color);
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--border-color);
}

.result-item:last-child {
    border-bottom: none;
}

.result-label {
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.result-value {
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-size: 0.95rem;
    color: var(--text-color);
    background: white;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.result-value.highlight {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: #fff;
}

/* Binary Display */
.binary-display {
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
    padding: 1rem;
    background: var(--primary-darker);
    color: #4ade80;
    border-radius: 6px;
    overflow-x: auto;
}

/* Content Section */
.content-section {
    padding: 3rem 0;
}

.content-section h2 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.content-section h3 {
    color: var(--text-color);
    margin-top: 2rem;
    margin-bottom: 0.75rem;
    font-size: 1.2rem;
}

.content-section p {
    color: var(--text-muted);
    font-size: 1rem;
    margin-bottom: 1rem;
}

.content-section ul,
.content-section ol {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
}

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

/* Info Box */
.info-box {
    background: var(--bg-light);
    border-left: 3px solid var(--primary-dark);
    padding: 1.25rem;
    border-radius: 0 6px 6px 0;
    margin: 1.5rem 0;
}

.info-box h5 {
    color: var(--text-color);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.info-box p {
    color: var(--text-muted);
    margin-bottom: 0;
}

/* Warning Box */
.warning-box {
    background: #fef3cd;
    border-left: 3px solid #ffc107;
    padding: 1.25rem;
    border-radius: 0 6px 6px 0;
    margin: 1.5rem 0;
}

.warning-box h5 {
    color: #856404;
}

/* Example Box */
.example-box {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1.25rem;
    margin: 1.5rem 0;
}

.example-box h5 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
}

.example-box code {
    background: #e9ecef;
    padding: 0.2rem 0.4rem;
    border-radius: 3px;
    font-size: 0.9rem;
}

/* Reference Table */
.reference-table {
    margin: 1.5rem 0;
}

.reference-table th {
    background: var(--primary-dark);
    color: white;
    font-weight: 600;
    padding: 0.75rem;
}

.reference-table td {
    padding: 0.75rem;
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-size: 0.9rem;
}

.reference-table tbody tr:nth-child(even) {
    background: var(--bg-light);
}

/* Sidebar Card */
.card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.card-header {
    font-weight: 600;
}

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

.card-header.bg-secondary {
    background-color: #6c757d !important;
}

.card-body a {
    color: var(--text-color);
}

.card-body a:hover {
    color: var(--primary-dark);
}

/* Related Tools Section */
.related-tools {
    background: var(--bg-light);
    padding: 3rem 0;
}

.related-tools h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.tool-card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: box-shadow 0.2s ease;
    height: 100%;
}

.tool-card:hover {
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.tool-card h5 {
    color: var(--text-color);
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.tool-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.tool-card .btn-outline-primary {
    color: var(--primary-dark);
    border-color: var(--primary-dark);
}

.tool-card .btn-outline-primary:hover {
    background-color: var(--primary-dark);
    color: #fff;
}

/* FAQ Section */
.faq-section {
    padding: 3rem 0;
}

.faq-section h2 {
    text-align: center;
    margin-bottom: 2rem;
}

.accordion-item {
    border: 1px solid var(--border-color);
    margin-bottom: 0.5rem;
    border-radius: 6px !important;
    overflow: hidden;
}

.accordion-button {
    font-weight: 600;
    color: var(--text-color);
    background: var(--bg-light);
}

.accordion-button:not(.collapsed) {
    background: var(--primary-dark);
    color: #fff;
}

.accordion-button:focus {
    box-shadow: none;
    border-color: var(--border-color);
}

.accordion-body {
    color: var(--text-muted);
    line-height: 1.8;
}

/* Footer */
footer {
    background-color: var(--primary-dark) !important;
    color: #fff;
    padding: 3rem 0 1.5rem 0;
}

footer h5,
footer h6 {
    color: #fff;
    font-weight: 600;
    margin-bottom: 1.25rem;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

footer p {
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
    line-height: 1.6;
}

footer ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

footer ul li {
    margin-bottom: 0.6rem;
}

footer ul li a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

footer ul li a:hover {
    color: #fff;
}

footer a.text-info {
    color: rgba(255,255,255,0.9) !important;
    text-decoration: underline;
}

footer a.text-info:hover {
    color: #fff !important;
}

footer hr {
    border-color: rgba(255,255,255,0.2);
    margin: 2rem 0 1.5rem 0;
}

footer .text-muted {
    color: rgba(255,255,255,0.6) !important;
}

footer .small {
    font-size: 0.85rem;
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
}

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

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

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

/* Alerts */
.alert-danger {
    background-color: #f8d7da;
    border-color: #f5c2c7;
    color: #842029;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .hero-section {
        padding: 2rem 0;
    }

    .hero-section h1 {
        font-size: 1.75rem;
    }

    .calculator-card {
        padding: 1.25rem;
        margin-top: -25px;
    }

    .result-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .result-value {
        width: 100%;
        text-align: center;
    }

    .content-section {
        padding: 2rem 0;
    }

    footer {
        padding: 2rem 0 1rem 0;
    }

    footer .row > div {
        margin-bottom: 1.5rem;
    }
}

/* Print Styles */
@media print {
    .navbar, footer, .btn {
        display: none !important;
    }

    .calculator-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

/* Utility Classes */
.font-mono {
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
}

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

.text-dark-professional {
    color: var(--primary-dark) !important;
}