:root {
    --primary: #4361ee;
    --secondary: #3a0ca3;
    --success: #4cc9f0;
    --dark: #2b2d42;
    --light: #f8f9fa;
}

body {
    min-height: 100vh;
    /*font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;*/
   
}

/* Main Container Styles */
.main {
    width: 100%;
}

.smtp-responsive-container {
    max-width: 100%;
    overflow-x: hidden;
}

/* Tool Container Styles */
.tool-container {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    margin: 2rem auto;
    padding: 2rem;
}

.tool-header {
    margin-bottom: 2rem;
}

.h-h1 {
    color: var(--dark);
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.title-desc {
    color: #6c757d;
    font-size: 1.1rem;
    margin-bottom: 0;
}

/* Form Card Styles */
.form-card,
.mobile-card {
    background: white;
    border: none;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    margin-bottom: 2rem;
    overflow: hidden;
}

.card-header,
.mobile-card-header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border-radius: 15px 15px 0 0 !important;
    padding: 1.5rem;
    font-weight: 600;
    border: none;
}

.card-body {
    padding: 1.5rem;
}

.card-body.p-4 {
    padding: 2rem !important;
}

/* Form Elements */
.form-label,
.mobile-label {
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 0.5rem;
    display: block;
}

.form-control,
.mobile-input,
.mobile-select {
    border: 2px solid #e9ecef;
    border-radius: 10px;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
    height: auto;
    width: 100%;
}

.form-control:focus,
.mobile-input:focus,
.mobile-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.2rem rgba(67, 97, 238, 0.25);
    outline: none;
}

/* Remove red border from required fields */
.form-control:required:invalid,
.mobile-input:required:invalid,
.mobile-select:required:invalid,
.form-control:required:valid,
.mobile-input:required:valid,
.mobile-select:required:valid {
    border-color: #e9ecef !important;
}

/* Button Styles */
.btn-primary,
.mobile-btn.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border: none;
    border-radius: 10px;
    padding: 0.75rem 2rem;
    font-weight: 600;
    transition: all 0.3s ease;
    color: white;
}

.btn-primary:hover,
.btn-primary:focus,
.mobile-btn.btn-primary:hover,
.mobile-btn.btn-primary:focus {
    background: linear-gradient(135deg, var(--secondary), var(--primary));
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(67, 97, 238, 0.4);
    color: white;
    border: none;
}

.btn-outline-secondary,
.mobile-btn.btn-outline-secondary {
    border-radius: 10px;
    padding: 0.75rem 2rem;
    font-weight: 600;
    border: 2px solid #6c757d;
    background: transparent;
    color: #6c757d;
    transition: all 0.3s ease;
}

.btn-outline-secondary:hover,
.mobile-btn.btn-outline-secondary:hover {
    background: #6c757d;
    color: white;
    transform: translateY(-1px);
}

/* Button Group Styles */
.btn-group-mobile {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.mobile-btn {
    padding: 14px 20px;
    font-weight: 600;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
    width: 100%;
    margin: 2px 0;
}

/* Alert Styles */
.alert,
.mobile-alert {
    border-radius: 10px;
    border: none;
    padding: 1rem 1.5rem;
}

.alert-success,
.mobile-alert.alert-success {
    background-color: rgba(40, 167, 69, 0.1);
    color: #155724;
    border-left: 4px solid #28a745;
}

.alert-danger,
.mobile-alert.alert-danger {
    background-color: rgba(220, 53, 69, 0.1);
    color: #721c24;
    border-left: 4px solid #dc3545;
}

.alert-text {
    word-wrap: break-word;
    font-size: 0.95rem;
}

/* Help Section Styles */
.hint-box,
.mobile-hint-box {
    background: #f8f9fa;
    border-left: 4px solid var(--success);
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1rem;
    width: 100%;
    display: block;
}

.hint-title,
.mobile-hint-title {
    color: var(--dark);
    font-weight: 600;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
}

.port-badge,
.mobile-port-badge {
    background: var(--success);
    color: white;
    border-radius: 20px;
    padding: 0.25rem 0.75rem;
    font-size: 0.8rem;
    margin-right: 0.5rem;
    margin-bottom: 0.5rem;
    display: inline-block;
}

.mobile-port-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.info-icon {
    color: var(--success);
    margin-right: 0.5rem;
}

.mobile-hint-list {
    padding-left: 0;
    list-style: none;
}

.mobile-hint-item {
    margin-bottom: 10px;
    line-height: 1.5;
    font-size: 0.9rem;
    display: block;
}

/* Loading Spinner */
.mobile-spinner {
    width: 2.5rem;
    height: 2.5rem;
    border-width: 0.3em;
}

.mobile-loading-text {
    font-size: 0.9rem;
}

/* Mobile Sidebar */
.mobile-sidebar {
    position: static;
}

/* Custom Port Container */
.custom-port-container {
    display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .tool-container {
        margin: 1rem auto;
        padding: 1rem;
        border-radius: 15px;
    }
    
    .card-body.p-4 {
        padding: 1.5rem !important;
    }
    
    .btn-primary,
    .btn-outline-secondary,
    .mobile-btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }
    
    .col-md-6,
    .col-md-3 {
        margin-bottom: 1rem;
    }
    
    .tool-header h1 {
        font-size: 1.5rem !important;
        line-height: 1.3;
    }
    
    .tool-header .title-desc {
        font-size: 0.95rem !important;
    }
    
    .card-body {
        padding: 15px !important;
    }
    
    .row > [class*="col-"] {
        margin-bottom: 15px;
    }
    
    .pb-4 {
        padding-bottom: 1rem !important;
    }
    
    .mobile-input, 
    .mobile-select {
        font-size: 16px;
        padding: 12px;
    }
}

@media (min-width: 768px) and (max-width: 991px) {
    .btn-group-mobile {
        flex-direction: row;
        width: auto;
    }
    
    .mobile-btn {
        width: auto;
        margin: 0 5px;
    }
    
    .tool-container {
        padding: 0 20px;
    }
}

@media (min-width: 992px) {
    .btn-group-mobile {
        flex-direction: row;
        width: auto;
    }
    
    .mobile-btn {
        width: auto;
        margin: 0 5px;
    }
}

@media (max-width: 576px) {
    .h-h1 {
        font-size: 1.8rem;
    }
    
    .title-desc {
        font-size: 1rem;
    }
    
    .form-control,
    .mobile-input,
    .mobile-select {
        padding: 0.6rem 0.8rem;
    }
    
    .container-inner {
        padding: 0 10px;
    }
    
    .mobile-card {
        border-radius: 8px;
        margin-bottom: 15px;
    }
    
    .mobile-card-header {
        padding: 12px 15px;
        font-size: 1rem;
    }
    
    .mobile-input, 
    .mobile-select {
        padding: 14px 12px;
    }
    
    .mobile-btn {
        padding: 16px 20px;
        font-size: 1.1rem;
    }
    
    .mobile-hint-box {
        padding: 12px;
    }
    
    .mobile-port-badge {
        font-size: 0.75rem;
        padding: 5px 10px;
    }
    
    .mobile-hint-item {
        font-size: 0.85rem;
    }
}

/* Very small screens */
@media (max-width: 360px) {
    .tool-header h1 {
        font-size: 1.3rem !important;
    }
    
    .mobile-card-header {
        font-size: 0.95rem;
    }
    
    .mobile-label {
        font-size: 0.9rem;
    }
    
    .mobile-btn {
        font-size: 1rem;
        padding: 14px 16px;
    }
}

/* Utility Classes */
.mb-3 { margin-bottom: 1rem !important; }
.mt-1 { margin-top: 0.25rem !important; }
.mt-2 { margin-top: 0.5rem !important; }
.mt-3 { margin-top: 1rem !important; }
.mt-4 { margin-top: 1.5rem !important; }
.mr-1 { margin-right: 0.25rem !important; }
.mr-2 { margin-right: 0.5rem !important; }
.pb-3 { padding-bottom: 1rem !important; }
.pb-4 { padding-bottom: 1.5rem !important; }

.d-flex { display: flex !important; }
.justify-content-center { justify-content: center !important; }
.text-center { text-align: center !important; }
.mx-auto { margin-right: auto !important; margin-left: auto !important; }

/* Sticky sidebar */
.sticky-sidebar {
    position: sticky;
    top: 20px;
}

.sticky-top {
    position: sticky;
    top: 0;
    z-index: 1020;
}

/* Ensure proper spacing on all devices */
.tool-container-2 {
    padding: 0 5px;
}

@media (min-width: 768px) {
    .tool-container-2 {
        padding: 0 15px;
    }
}

/* Smooth transitions */
.form-control,
.mobile-input,
.mobile-select,
.mobile-btn,
.mobile-alert,
.btn-primary,
.btn-outline-secondary {
    transition: all 0.3s ease;
}