/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Professional Dark Theme Colors */
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    
    /* Section Colors - Professional palette */
    --color-private: #10b981;       /* Green - Private IPs */
    --color-private-dark: #059669;
    --color-private-light: #064e3b;
    
    --color-cidr: #3b82f6;          /* Blue - CIDR */
    --color-cidr-dark: #2563eb;
    --color-cidr-light: #1e3a8a;
    
    --color-special: #8b5cf6;       /* Purple - Special IPs */
    --color-special-dark: #7c3aed;
    --color-special-light: #4c1d95;
    
    --color-ports: #f59e0b;         /* Amber - Ports */
    --color-ports-dark: #d97706;
    --color-ports-light: #78350f;
    
    --color-ipv6: #06b6d4;          /* Cyan - IPv6 */
    --color-ipv6-dark: #0891b2;
    --color-ipv6-light: #155e75;
    
    --color-calc: #ef4444;          /* Red - Calculations */
    --color-calc-dark: #dc2626;
    --color-calc-light: #7f1d1d;
    
    --color-binary: #f97316;        /* Orange - Binary */
    --color-binary-dark: #ea580c;
    --color-binary-light: #7c2d12;
    
    --color-classes: #6366f1;       /* Indigo - IP Classes */
    --color-classes-dark: #4f46e5;
    --color-classes-light: #3730a3;
    
    /* Dark Theme Base Colors */
    --background: #0f172a;
    --surface: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #334155;
    --code-bg: #1e293b;
    
    /* Shadows for dark theme */
    --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.4);
    --shadow-md: 0 6px 12px -2px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.6);
    --shadow-colored: 0 10px 30px -5px rgba(0, 0, 0, 0.5);
    
    --border-radius: 8px;
    --transition: all 0.3s ease;
}


html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}


/* Header */
header {
    background: 
        linear-gradient(135deg, rgba(15, 23, 42, 0.70) 0%, rgba(30, 41, 59, 0.65) 100%),
        url('https://images.unsplash.com/photo-1544197150-b99a580bb7a8?w=1600&q=80') center/cover;
    color: white;
    padding: 3rem 1rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
    border-bottom: 3px solid var(--primary-color);
}


header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-align: center;
    position: relative;
    z-index: 1;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

header h1 i {
    color: var(--primary-light);
}

.subtitle {
    text-align: center;
    font-size: 1.125rem;
    opacity: 0.95;
    margin-bottom: 2rem;
    position: relative;
    z-index: 1;
}

/* Search Container */
.search-container {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

#searchInput {
    width: 100%;
    padding: 1rem 1.5rem;
    font-size: 1rem;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.95);
}

#searchInput:focus {
    outline: none;
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.4), var(--shadow-lg);
    background: white;
    border-color: rgba(255, 255, 255, 0.6);
}


/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Sections */
section {
    margin-bottom: 4rem;
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

section h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    border-bottom: 3px solid var(--border-color);
    padding-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

section h2 i {
    color: var(--primary-color);
    width: 32px;
    height: 32px;
}


section h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    position: relative;
    padding-left: 1rem;
}

section h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 70%;
    background: var(--primary-color);
    border-radius: 2px;
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}


.card h3 {
    font-size: 1.25rem;
    margin-top: 0;
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-weight: 700;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card h3 i {
    width: 20px;
    height: 20px;
}

.quick-reference .card.highlight:nth-child(1) h3 {
    color: var(--color-private);
    border-bottom-color: var(--color-private);
}

.quick-reference .card.highlight:nth-child(2) h3 {
    color: var(--color-special);
    border-bottom-color: var(--color-special);
}

.quick-reference .card.highlight:nth-child(3) h3 {
    color: var(--color-ports);
    border-bottom-color: var(--color-ports);
}

/* Quick Reference specific styling */
.card-note {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px dashed var(--border-color);
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* Individual Quick Reference card colors */
.qr-private {
    border-left-color: var(--color-private) !important;
}

.qr-private h3 {
    color: var(--color-private) !important;
    border-bottom-color: var(--color-private) !important;
}
.qr-private h3 i { color: var(--color-private) !important; }

.qr-subnets {
    border-left-color: var(--color-cidr) !important;
}

.qr-subnets h3 {
    color: var(--color-cidr) !important;
    border-bottom-color: var(--color-cidr) !important;
}
.qr-subnets h3 i { color: var(--color-cidr) !important; }

.qr-dns {
    border-left-color: var(--color-ipv6) !important;
}

.qr-dns h3 {
    color: var(--color-ipv6) !important;
    border-bottom-color: var(--color-ipv6) !important;
}
.qr-dns h3 i { color: var(--color-ipv6) !important; }

.qr-special {
    border-left-color: var(--color-special) !important;
}

.qr-special h3 {
    color: var(--color-special) !important;
    border-bottom-color: var(--color-special) !important;
}
.qr-special h3 i { color: var(--color-special) !important; }

.qr-ports {
    border-left-color: var(--color-ports) !important;
}

.qr-ports h3 {
    color: var(--color-ports) !important;
    border-bottom-color: var(--color-ports) !important;
}
.qr-ports h3 i { color: var(--color-ports) !important; }

.qr-gateways {
    border-left-color: var(--color-calc) !important;
}

.qr-gateways h3 {
    color: var(--color-calc) !important;
    border-bottom-color: var(--color-calc) !important;
}
.qr-gateways h3 i { color: var(--color-calc) !important; }

.qr-linklocal {
    border-left-color: var(--color-binary) !important;
}

.qr-linklocal h3 {
    color: var(--color-binary) !important;
    border-bottom-color: var(--color-binary) !important;
}
.qr-linklocal h3 i { color: var(--color-binary) !important; }

.qr-cidr {
    border-left-color: var(--color-classes) !important;
}

.qr-cidr h3 {
    color: var(--color-classes) !important;
    border-bottom-color: var(--color-classes) !important;
}
.qr-cidr h3 i { color: var(--color-classes) !important; }

.qr-ipv6 {
    border-left-color: var(--color-ipv6) !important;
}

.qr-ipv6 h3 {
    color: var(--color-ipv6) !important;
    border-bottom-color: var(--color-ipv6) !important;
}
.qr-ipv6 h3 i { color: var(--color-ipv6) !important; }

.special-ips .card h3 {
    font-weight: 700;
    color: var(--color-special);
    border-bottom: 2px solid var(--color-special);
    padding-bottom: 0.5rem;
}

.special-card {
    padding: 1.5rem !important;
}

.special-card p {
    margin: 0.5rem 0;
    line-height: 1.6;
}

.special-card p:first-of-type {
    color: var(--text-primary);
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
}

.special-card p:nth-of-type(2) {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.calculation-tips .card h3 {
    color: var(--color-calc);
    border-bottom-color: var(--color-calc);
}

.card.highlight {
    border-left: 4px solid var(--color-private);
    background: var(--surface);
}

.card.tip-card {
    border-left: 4px solid var(--color-calc);
    background: var(--surface);
}

.comparison-card {
    border-top: 4px solid var(--color-ipv6);
    background: var(--surface);
}

/* Section-specific color themes */
.quick-reference .card.highlight:nth-child(1) {
    border-left-color: var(--color-private);
}

.quick-reference .card.highlight:nth-child(2) {
    border-left-color: var(--color-special);
}

.quick-reference .card.highlight:nth-child(3) {
    border-left-color: var(--color-ports);
}

.special-ips .card:nth-child(1) { border-left: 4px solid var(--color-cidr); }
.special-ips .card:nth-child(2) { border-left: 4px solid var(--color-private); }
.special-ips .card:nth-child(3) { border-left: 4px solid var(--color-ports); }
.special-ips .card:nth-child(4) { border-left: 4px solid var(--color-ipv6); }
.special-ips .card:nth-child(5) { border-left: 4px solid var(--color-calc); }
.special-ips .card:nth-child(6) { border-left: 4px solid var(--color-special); }

/* Lists */
ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

ul.no-bullets {
    list-style: none;
    margin-left: 0;
}

ul.no-bullets li {
    padding: 0.5rem 0;
}

li {
    margin-bottom: 0.5rem;
}

/* Code elements */
code {
    background: var(--code-bg);
    padding: 0.25rem 0.6rem;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    color: var(--color-cidr);
    font-weight: 600;
    border: 1px solid var(--border-color);
}


.range {
    color: var(--text-secondary);
    font-size: 0.875rem;
    display: block;
    margin-top: 0.25rem;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    margin: 1.5rem 0;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface);
    font-size: 0.9rem;
}

.data-table thead {
    background: var(--primary-color);
    color: white;
}


.data-table th {
    padding: 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.data-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.data-table tbody tr {
    transition: var(--transition);
}

.data-table tbody tr:nth-child(odd) {
    background: var(--surface);
}

.data-table tbody tr:nth-child(even) {
    background: rgba(99, 102, 241, 0.03);
}

.data-table tbody tr:hover {
    background: linear-gradient(90deg, var(--color-cidr-light) 0%, transparent 100%);
    transform: scale(1.005);
}


.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* Color-coded tables by section */
.ip-classes .data-table thead {
    background: var(--color-classes);
}

.cidr-section .data-table thead {
    background: var(--color-cidr);
}

.ports-section .data-table thead {
    background: var(--color-ports);
}

.binary-reference .data-table thead {
    background: var(--color-binary);
}

.compact-table th,
.compact-table td {
    padding: 0.75rem;
    text-align: center;
}

/* Table strong elements - color badges */
.data-table tbody td strong {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-weight: 700;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
}

.ip-classes tbody tr:nth-child(1) td:first-child strong {
    background: var(--color-private);
    color: white;
}

.ip-classes tbody tr:nth-child(2) td:first-child strong {
    background: var(--color-cidr);
    color: white;
}

.ip-classes tbody tr:nth-child(3) td:first-child strong {
    background: var(--color-ports);
    color: white;
}

.ip-classes tbody tr:nth-child(4) td:first-child strong {
    background: var(--color-calc);
    color: white;
}

.ip-classes tbody tr:nth-child(5) td:first-child strong {
    background: var(--color-special);
    color: white;
}

/* Info boxes */
.info-box {
    background: var(--surface);
    border: 2px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin: 1.5rem 0;
    box-shadow: var(--shadow-sm);
}


.info-box h3 {
    margin-top: 0;
    color: var(--primary-color);
}

.cidr-section .info-box {
    border-left-color: var(--color-cidr);
}

.ipv-comparison .info-box {
    border-left-color: var(--color-ipv6);
}

.binary-reference .info-box {
    border-left-color: var(--color-binary);
}

.info-box p {
    margin-bottom: 1rem;
}

.info-box p:last-child {
    margin-bottom: 0;
}

.note {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 1rem;
    padding: 0.75rem 1rem;
    background: rgba(59, 130, 246, 0.05);
    border-left: 3px solid var(--primary-color);
    border-radius: 4px;
}

/* Comparison Grid */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

/* Footer */
footer {
    background: var(--surface);
    border-top: 3px solid var(--primary-color);
    padding: 2rem 1rem;
    margin-top: 4rem;
    text-align: center;
    color: var(--text-secondary);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
}


footer p {
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.footer-note {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* Color Legend */
.color-legend {
    animation: slideDown 0.5s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.color-legend strong {
    display: block;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease;
}

.legend-button {
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.legend-button::after {
    content: '→';
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%) translateX(20px);
    opacity: 0;
    transition: all 0.3s ease;
    font-weight: bold;
}

.legend-button:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.legend-button:hover::after {
    transform: translateY(-50%) translateX(0);
    opacity: 0.7;
}

.legend-button:active {
    transform: translateY(-1px) scale(1.02);
}


/* Section-specific styling */
.quick-reference {
    padding: 2rem;
    background: rgba(59, 130, 246, 0.02);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}


.ip-classes {
    padding: 2rem;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, transparent 100%);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-classes);
}


.cidr-section {
    padding: 2rem;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, transparent 100%);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-cidr);
}


.special-ips {
    padding: 2rem;
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.05) 0%, transparent 100%);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-special);
}


.ports-section {
    padding: 2rem;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.05) 0%, transparent 100%);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-ports);
}


.ipv-comparison {
    padding: 2rem;
    background: linear-gradient(135deg, rgba(6, 182, 212, 0.05) 0%, transparent 100%);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-ipv6);
}


.calculation-tips {
    padding: 2rem;
    background: linear-gradient(135deg, rgba(236, 72, 153, 0.05) 0%, transparent 100%);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-calc);
}


.binary-reference {
    padding: 2rem;
    background: linear-gradient(135deg, rgba(249, 115, 22, 0.05) 0%, transparent 100%);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--color-binary);
}


/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 8px;
    background: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 1000;
}


.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(139, 92, 246, 0.4);
}

.back-to-top:active {
    transform: translateY(-2px);
}

/* Reading Progress Bar */
.progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--primary-color);
    width: 0%;
    z-index: 9999;
    transition: width 0.1s ease;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.6);
}


/* Toast Notification */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--surface);
    color: var(--text-primary);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    border: 2px solid var(--primary-color);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 10000;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.toast::before {
    content: '✓';
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    font-weight: bold;
}


/* Sticky Table Headers */
.table-responsive {
    position: relative;
}

.data-table thead {
    position: sticky;
    top: 0;
    z-index: 10;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Enhanced Copy Button Visibility */
code {
    position: relative;
    cursor: pointer;
}

code:hover {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--primary-color);
}

/* Network Calculators Section */
.network-calculators {
    padding: 2rem;
    background: rgba(59, 130, 246, 0.03);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--primary-color);
}


.calculators-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.calculator-card {
    background: var(--surface);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.calculator-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}


.calculator-card h3 {
    margin-top: 0;
    margin-bottom: 1.5rem;
    color: var(--color-special);
    font-size: 1.25rem;
    border-bottom: 2px solid var(--color-special);
    padding-bottom: 0.5rem;
}

.calc-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input-group input {
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    font-family: 'Monaco', 'Menlo', monospace;
    background: var(--background);
    color: var(--text-primary);
    transition: var(--transition);
}

.input-group input:focus {
    outline: none;
    border-color: var(--color-special);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}


.calc-button {
    padding: 0.875rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.calc-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.calc-button:active {
    transform: translateY(0);
}


.divider {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    position: relative;
    margin: 0.5rem 0;
}

.divider::before,
.divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 40%;
    height: 1px;
    background: var(--border-color);
}

.divider::before {
    left: 0;
}

.divider::after {
    right: 0;
}

.calc-results {
    margin-top: 1.5rem;
    padding: 1rem;
    background: linear-gradient(135deg, var(--code-bg) 0%, rgba(139, 92, 246, 0.05) 100%);
    border-radius: 6px;
    border-left: 4px solid var(--color-private);
    min-height: 50px;
    display: none;
}

.calc-results.show {
    display: block;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.calc-results .result-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.calc-results .result-row:last-child {
    border-bottom: none;
}

.calc-results .result-label {
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.calc-results .result-value {
    font-family: 'Monaco', 'Menlo', monospace;
    color: var(--color-special);
    font-weight: 600;
    font-size: 1rem;
}

.calc-results .binary-display {
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 1.125rem;
    padding: 0.75rem;
    background: var(--surface);
    border-radius: 4px;
    margin: 0.5rem 0;
    word-break: break-all;
}

.calc-results .binary-octet {
    display: inline-block;
    margin: 0 0.25rem;
    padding: 0.25rem 0.5rem;
    background: linear-gradient(135deg, var(--color-cidr-light) 0%, var(--color-special-light) 100%);
    border-radius: 4px;
}

.calc-results .network-bits {
    color: var(--color-private);
}

.calc-results .host-bits {
    color: var(--color-ports);
}

.calc-results .badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.calc-results .badge.private {
    background: var(--color-private);
    color: white;
}

.calc-results .badge.public {
    background: var(--color-ports);
    color: white;
}

.calc-results .badge.special {
    background: var(--color-special);
    color: white;
}

.calc-results .badge.class-a {
    background: var(--color-private);
    color: white;
}

.calc-results .badge.class-b {
    background: var(--color-cidr);
    color: white;
}

.calc-results .badge.class-c {
    background: var(--color-ports);
    color: white;
}

.calc-results .badge.class-d {
    background: var(--color-calc);
    color: white;
}

.calc-results .badge.class-e {
    background: var(--color-special);
    color: white;
}

.calc-results .error {
    color: #ef4444;
    font-weight: 600;
    padding: 1rem;
    background: rgba(239, 68, 68, 0.1);
    border-radius: 4px;
    border-left: 4px solid #ef4444;
}

.calc-results .subnet-list {
    max-height: 400px;
    overflow-y: auto;
    margin-top: 1rem;
}

.calc-results .subnet-item {
    padding: 0.75rem;
    margin: 0.5rem 0;
    background: var(--surface);
    border-radius: 4px;
    border-left: 3px solid var(--color-cidr);
}

.calc-results .subnet-item h4 {
    margin: 0 0 0.5rem 0;
    color: var(--color-cidr);
    font-size: 0.875rem;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

/* Print Styles */
@media print {
    header {
        background: none;
        color: black;
        box-shadow: none;
    }
    
    .search-container {
        display: none;
    }
    
    .card,
    .data-table {
        break-inside: avoid;
    }
    
    section {
        page-break-inside: avoid;
    }
}



/* Subtle animations on scroll */
section {
    scroll-margin-top: 2rem;
}

@media (prefers-reduced-motion: no-preference) {
    .card,
    .data-table,
    .info-box {
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    section h2 {
        font-size: 1.5rem;
    }
    
    section h3 {
        font-size: 1.25rem;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .comparison-grid {
        grid-template-columns: 1fr;
    }
    
    .data-table {
        font-size: 0.8rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 0.75rem 0.5rem;
    }
    
    header {
        padding: 2rem 1rem;
    }
    
    .calculators-grid {
        grid-template-columns: 1fr;
    }
    
    .calc-results .result-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.75rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 0.5rem 0.25rem;
        font-size: 0.75rem;
    }
    
    .card {
        padding: 1rem;
    }
    
    .info-box {
        padding: 1rem;
    }
    
    .back-to-top {
        bottom: 1rem;
        right: 1rem;
        width: 45px;
        height: 45px;
    }
    
    .toast {
        bottom: 1rem;
        max-width: 90%;
        padding: 0.75rem 1rem;
        font-size: 0.875rem;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus,
input:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Selection styles */
::selection {
    background-color: var(--primary-color);
    color: white;
}

::-moz-selection {
    background-color: var(--primary-color);
    color: white;
}