/* HTTPTunnel Genius - Modern UI/UX Styles with Light/Dark Mode */

:root {
    /* Color Scheme Variables - Light Mode (Default) */
    --primary-color: #0066cc;
    --primary-dark: #004499;
    --primary-light: #3385d6;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --info-color: #17a2b8;
    --danger-color: #dc3545;

    /* Theme-dependent colors - Light Mode */
    --bg-color: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-color: #212529;
    --text-muted: #6c757d;
    --text-light: #868e96;
    --border-color: #dee2e6;
    --border-light: #e9ecef;
    --card-bg: #ffffff;
    --navbar-bg: #ffffff;
    --footer-bg: #343a40;
    --footer-text: #ffffff;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #0066cc 0%, #004499 100%);
    --gradient-secondary: linear-gradient(135deg, #6c757d 0%, #495057 100%);
    --gradient-hero: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);

    /* Shadows */
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);

    /* Layout */
    --border-radius: 0.375rem;
    --border-radius-lg: 0.5rem;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    /* Content Width System */
    --content-max-width: 1200px;
    --content-narrow-width: 800px;
    --content-wide-width: 1400px;
    --content-padding: 1rem;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    /* Theme-dependent colors - Dark Mode */
    --bg-color: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --text-color: #f0f6fc;
    --text-muted: #8b949e;
    --text-light: #7d8590;
    --border-color: #30363d;
    --border-light: #21262d;
    --card-bg: #161b22;
    --navbar-bg: #010409;
    --footer-bg: #010409;
    --footer-text: #f0f6fc;

    /* Override primary colors for better contrast in dark mode */
    --secondary-color: #8b949e;

    /* Adjusted gradients for dark mode */
    --gradient-hero: linear-gradient(135deg, #161b22 0%, #21262d 100%);
    --gradient-secondary: linear-gradient(135deg, #8b949e 0%, #7d8590 100%);

    /* Adjusted shadows for dark mode */
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.4);
    --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.7);
}

/* Auto theme detection based on browser preference */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        /* Apply dark mode variables when browser prefers dark and user hasn't selected light */
        --bg-color: #0d1117;
        --bg-secondary: #161b22;
        --bg-tertiary: #21262d;
        --text-color: #f0f6fc;
        --text-muted: #8b949e;
        --text-light: #7d8590;
        --border-color: #30363d;
        --border-light: #21262d;
        --card-bg: #161b22;
        --navbar-bg: #010409;
        --footer-bg: #010409;
        --footer-text: #f0f6fc;
        --secondary-color: #8b949e;
        --gradient-hero: linear-gradient(135deg, #161b22 0%, #21262d 100%);
        --gradient-secondary: linear-gradient(135deg, #8b949e 0%, #7d8590 100%);
        --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.4);
        --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.6);
        --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.7);
    }
}

/* Global Styles */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    overflow-x: hidden;
    transition: var(--transition);
}

.btn {
    border-radius: var(--border-radius);
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    transition: var(--transition);
    border: none;
    box-shadow: var(--shadow-sm);
}

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

.btn-primary {
    background: var(--gradient-primary);
    border: none;
}

.btn-outline-primary {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    background: transparent;
}

.btn-outline-primary:hover {
    background: var(--gradient-primary);
    border-color: var(--primary-color);
    color: white;
}

/* Hero Section */
.hero-section {
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23dee2e6" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.5;
    z-index: 1;
}

/* Dark mode hero grid */
[data-theme="dark"] .hero-section::before {
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%2330363d" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .hero-section::before {
        background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%2330363d" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
        opacity: 0.3;
    }
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: 1.5rem;
    font-weight: 300;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--secondary-color);
    margin-bottom: 2rem;
    line-height: 1.7;
}

.hero-actions {
    margin-bottom: 3rem;
}

.hero-stats .stat-item {
    padding: 1rem;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--secondary-color);
    margin: 0;
    font-weight: 500;
}

/* Hero Visual */
.hero-visual {
    position: relative;
    z-index: 2;
}

.proxy-demo-card {
    transform: perspective(1000px) rotateY(-5deg) rotateX(5deg);
    transition: var(--transition);
}

.proxy-demo-card:hover {
    transform: perspective(1000px) rotateY(-2deg) rotateX(2deg);
}

.proxy-demo-card .card {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
}

.proxy-address {
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.875rem;
    color: var(--dark-color);
}

/* Features Section */
.features-section {
    position: relative;
    background-color: var(--bg-secondary);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
}

.feature-card {
    padding: 2rem;
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    height: 100%;
    border: 1px solid var(--border-light);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
}

.feature-card h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.feature-card p {
    color: var(--text-muted);
}

/* How It Works Section */
.how-it-works-content {
    padding: 2rem 0;
}

.step-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.step-item:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-md);
}

.step-number {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    margin-right: 1.5rem;
    flex-shrink: 0;
}

.step-content h5 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.step-content p {
    color: var(--text-muted);
    margin: 0;
    line-height: 1.6;
}

/* Network Diagram */
.diagram-container {
    padding: 3rem;
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
}

.network-diagram {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 2rem 0;
    max-width: 100%;
}

.diagram-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    text-align: center;
}

.diagram-step > div {
    width: 90px;
    height: 90px;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.8rem;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    position: relative;
}

.diagram-step > div:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.diagram-step > div span {
    position: absolute;
    bottom: -35px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-color);
    white-space: nowrap;
    text-align: center;
    width: 110px;
}

.diagram-arrow {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: bold;
    margin: 0 0.5rem;
    align-self: center;
    margin-top: -17px;
}

/* CTA Section */
.cta-section {
    background: var(--gradient-primary);
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="white" opacity="0.1"/><circle cx="80" cy="80" r="2" fill="white" opacity="0.1"/><circle cx="40" cy="70" r="1" fill="white" opacity="0.05"/><circle cx="90" cy="30" r="1" fill="white" opacity="0.05"/></svg>');
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: translateY(0) rotate(0deg); }
    100% { transform: translateY(-100px) rotate(360deg); }
}

.cta-section h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-section .lead {
    font-size: 1.25rem;
    opacity: 0.9;
}

/* Navigation Enhancements */
.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

.navbar-nav .nav-link {
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.navbar-nav .nav-link:hover {
    color: var(--primary-color) !important;
    transform: translateY(-1px);
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
    transform: translateX(-50%);
}

.navbar-nav .nav-link:hover::after {
    width: 100%;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .network-diagram {
        flex-direction: column;
        gap: 1.5rem;
        justify-content: center;
    }

    .diagram-arrow {
        transform: rotate(90deg);
        margin: 1rem 0;
        margin-top: 0;
    }

    .diagram-step {
        flex: none;
    }

    .diagram-step > div {
        width: 80px;
        height: 80px;
        font-size: 1.5rem;
    }

    .diagram-step > div span {
        bottom: -30px;
        width: 100px;
        font-size: 0.8rem;
    }

    .proxy-demo-card {
        transform: none;
        margin-top: 2rem;
    }

    .step-item {
        flex-direction: column;
        text-align: center;
    }

    .step-number {
        margin-right: 0;
        margin-bottom: 1rem;
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Theme Toggle */
.theme-toggle {
    position: relative;
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.theme-toggle i {
    font-size: 1.1rem;
    transition: var(--transition);
}

.theme-toggle[data-theme="light"] .fa-moon {
    display: block;
}

.theme-toggle[data-theme="light"] .fa-sun {
    display: none;
}

.theme-toggle[data-theme="dark"] .fa-sun {
    display: block;
}

.theme-toggle[data-theme="dark"] .fa-moon {
    display: none;
}

/* Theme transition animation */
.theme-transition {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease !important;
}

.theme-transition * {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease !important;
}

/* Update navbar and footer for theme support */
.navbar {
    background-color: var(--navbar-bg) !important;
    border-color: var(--border-color) !important;
}

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

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

.footer {
    background-color: var(--footer-bg) !important;
    color: var(--footer-text) !important;
}

/* Utility Classes */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Standardized Content Layout System */
.content-container {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding-left: var(--content-padding);
    padding-right: var(--content-padding);
    width: 100%;
}

.content-container-narrow {
    max-width: var(--content-narrow-width);
    margin: 0 auto;
    padding-left: var(--content-padding);
    padding-right: var(--content-padding);
    width: 100%;
}

.content-container-wide {
    max-width: var(--content-wide-width);
    margin: 0 auto;
    padding-left: var(--content-padding);
    padding-right: var(--content-padding);
    width: 100%;
}

/* Section Layout Classes */
.section-standard {
    padding: 5rem 0;
}

.section-compact {
    padding: 3rem 0;
}

.section-hero {
    padding: 6rem 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

/* Responsive Content Padding */
@media (min-width: 768px) {
    :root {
        --content-padding: 2rem;
    }
}

@media (min-width: 1200px) {
    :root {
        --content-padding: 3rem;
    }
}

.shadow-custom {
    box-shadow: var(--shadow-lg);
}

.border-gradient {
    border: 2px solid transparent;
    background: linear-gradient(var(--card-bg), var(--card-bg)) padding-box,
                var(--gradient-primary) border-box;
}

/* Accessibility */
.btn:focus,
.nav-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

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

/* Dark Mode Specific Improvements */
[data-theme="dark"] {
    /* Improve stat number visibility */
    .stat-number {
        color: var(--text-color);
    }

    /* Better contrast for diagram labels */
    .diagram-step span {
        color: var(--text-color);
    }

    /* Improve proxy address readability */
    .proxy-address {
        color: var(--text-color);
    }

    /* Fix card headers and body in dark mode */
    .card-header {
        background-color: var(--bg-tertiary) !important;
        color: var(--text-color) !important;
        border-bottom: 1px solid var(--border-color) !important;
    }

    .card-body {
        background-color: var(--card-bg) !important;
        color: var(--text-color) !important;
    }

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

    /* Custom proxy status text */
    .proxy-status-text {
        color: var(--text-muted) !important;
    }

    /* Fix Bootstrap badge colors in dark mode */
    .bg-success {
        background-color: #28a745 !important;
        color: white !important;
    }

    .bg-warning {
        background-color: #ffc107 !important;
        color: #212529 !important;
    }

    .bg-info {
        background-color: #17a2b8 !important;
        color: white !important;
    }

    /* Ensure features section has proper dark background */
    .features-section {
        background-color: var(--bg-secondary) !important;
    }

    /* Enhanced badge visibility */
    .badge {
        background-color: var(--bg-tertiary) !important;
        color: var(--text-color) !important;
        border: 1px solid var(--border-color);
    }

    /* Better input field styling */
    .form-control {
        background-color: var(--bg-secondary);
        border-color: var(--border-color);
        color: var(--text-color);
    }

    .form-control:focus {
        background-color: var(--bg-secondary);
        border-color: var(--primary-color);
        color: var(--text-color);
        box-shadow: 0 0 0 0.2rem rgba(0, 102, 204, 0.25);
    }

    /* Improve section divider visibility */
    hr {
        border-color: var(--border-color);
        opacity: 0.3;
    }
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        /* Apply same dark mode improvements for auto-detection */
        .stat-number {
            color: var(--text-color);
        }

        .diagram-step span {
            color: var(--text-color);
        }

        .proxy-address {
            color: var(--text-color);
        }

        .card-header {
            background-color: var(--bg-tertiary) !important;
            color: var(--text-color) !important;
            border-bottom: 1px solid var(--border-color) !important;
        }

        .card-body {
            background-color: var(--card-bg) !important;
            color: var(--text-color) !important;
        }

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

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

        .bg-success {
            background-color: #28a745 !important;
            color: white !important;
        }

        .bg-warning {
            background-color: #ffc107 !important;
            color: #212529 !important;
        }

        .bg-info {
            background-color: #17a2b8 !important;
            color: white !important;
        }

        .features-section {
            background-color: var(--bg-secondary) !important;
        }

        .badge {
            background-color: var(--bg-tertiary) !important;
            color: var(--text-color) !important;
            border: 1px solid var(--border-color);
        }

        .form-control {
            background-color: var(--bg-secondary);
            border-color: var(--border-color);
            color: var(--text-color);
        }

        .form-control:focus {
            background-color: var(--bg-secondary);
            border-color: var(--primary-color);
            color: var(--text-color);
            box-shadow: 0 0 0 0.2rem rgba(0, 102, 204, 0.25);
        }

        hr {
            border-color: var(--border-color);
            opacity: 0.3;
        }
    }
}

/* ===== PROXY CHECKER IMPROVEMENTS ===== */

/* Fix input group alignment and consistent heights */
.proxy-checker-form .input-group {
    align-items: stretch;
}

.proxy-checker-form .input-group .form-control,
.proxy-checker-form .input-group .form-select,
.proxy-checker-form .input-group .btn {
    height: 48px;
    display: flex;
    align-items: center;
}

/* Fix input group prepend/append consistent borders and backgrounds */
.input-group-text {
    background-color: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-muted);
}

/* Fix form control borders - ensure consistent border colors */
.form-control {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color) !important;
    color: var(--text-color);
    transition: all 0.2s ease-in-out;
}

.form-control:focus {
    background-color: var(--bg-secondary);
    border-color: var(--primary-color) !important;
    color: var(--text-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 102, 204, 0.25);
}

.form-select {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color) !important;
    color: var(--text-color);
}

.form-select:focus {
    background-color: var(--bg-secondary);
    border-color: var(--primary-color) !important;
    color: var(--text-color);
    box-shadow: 0 0 0 0.2rem rgba(0, 102, 204, 0.25);
}

/* Improve proxy details table visibility in dark mode */
.proxy-details-table {
    background-color: transparent;
}

.proxy-details-table td {
    border-color: var(--border-color);
    color: var(--text-color);
}

.proxy-details-table td.text-muted {
    color: var(--text-muted) !important;
}

.proxy-details-table code {
    background-color: var(--bg-tertiary);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

/* Fix button alignment with input groups */
.proxy-test-button {
    height: 48px !important;
    display: flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    margin-top: 31px !important; /* Account for label height + margin */
    margin-bottom: 0 !important;
}

/* Fix the button container alignment */
.proxy-checker-form .d-flex.align-items-end {
    align-items: flex-start !important;
}

.proxy-checker-form .d-flex.align-items-end .btn {
    margin-top: 31px !important; /* Same as label + margin */
    align-self: flex-start;
}

/* Dark mode specific improvements */
[data-theme="dark"] .input-group-text {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-muted);
}

[data-theme="dark"] .proxy-details-table td {
    border-color: var(--border-color);
    color: var(--text-color);
}

[data-theme="dark"] .proxy-details-table td.text-muted {
    color: var(--text-muted) !important;
}

[data-theme="dark"] .proxy-details-table code {
    background-color: var(--bg-tertiary);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

/* Responsive improvements */
@@media (max-width: 768px) {
    .proxy-checker-form .input-group .btn {
        margin-top: 0.5rem;
        width: 100%;
    }

    .proxy-test-button {
        width: 100%;
        margin-top: 0.75rem;
    }
}