/* CQDX.group Custom CSS - Modern Design Without Bootstrap */

/* CSS Variables */
:root {
    --primary-color: #0d6efd;
    --primary-dark: #0b5ed7;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    --white: #ffffff;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 1rem;
    --line-height-base: 1.5;
    --border-radius: 0.375rem;
    --border-radius-lg: 0.5rem;
    --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --box-shadow-lg: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --transition: all 0.15s ease-in-out;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--gray-700);
    background-color: var(--gray-100);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: 0.5rem;
    font-weight: 600;
    line-height: 1.2;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
}

.lead {
    font-size: 1.25rem;
    font-weight: 300;
}

/* Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -0.5rem;
}

.col, .col-1, .col-2, .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-10, .col-11, .col-12,
.col-md-1, .col-md-2, .col-md-3, .col-md-4, .col-md-5, .col-md-6, .col-md-7, .col-md-8, .col-md-9, .col-md-10, .col-md-11, .col-md-12,
.col-lg-1, .col-lg-2, .col-lg-3, .col-lg-4, .col-lg-5, .col-lg-6, .col-lg-7, .col-lg-8, .col-lg-9, .col-lg-10, .col-lg-11, .col-lg-12 {
    padding: 0 0.5rem;
    flex: 1;
}

.col-12 { flex: 0 0 100%; }
.col-6 { flex: 0 0 50%; }
.col-4 { flex: 0 0 33.333333%; }
.col-3 { flex: 0 0 25%; }

@media (min-width: 768px) {
    .col-md-6 { flex: 0 0 50%; }
    .col-md-4 { flex: 0 0 33.333333%; }
    .col-md-3 { flex: 0 0 25%; }
}

@media (min-width: 992px) {
    .col-lg-8 { flex: 0 0 66.666667%; }
    .col-lg-6 { flex: 0 0 50%; }
    .col-lg-4 { flex: 0 0 33.333333%; }
    .col-lg-3 { flex: 0 0 25%; }
}

/* Navigation */
.navbar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 1rem 0;
    box-shadow: var(--box-shadow);
    position: relative;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    color: var(--white) !important;
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
    display: flex;
    align-items: center;
}

.navbar-brand:hover {
    color: var(--gray-100) !important;
}

.navbar-nav {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
}

.nav-item {
    margin-left: 1.5rem;
}

.nav-link {
    color: var(--white) !important;
    text-decoration: none;
    padding: 0.5rem 0;
    transition: var(--transition);
    border-bottom: 2px solid transparent;
}

.nav-link:hover,
.nav-link.active {
    color: var(--gray-100) !important;
    border-bottom-color: var(--white);
}

.navbar-toggler {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
    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="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="50" cy="50" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    opacity: 0.3;
}

.hero-section .container {
    position: relative;
    z-index: 1;
}

.display-4 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: var(--transition);
}

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

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
}

.card-body {
    padding: 1.5rem;
}

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

.card-header.bg-light {
    background: var(--gray-100) !important;
    color: var(--gray-700);
}

/* Card background colors */
.card.bg-primary {
    background: var(--primary-color) !important;
    color: var(--white);
}

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

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

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

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

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    line-height: 1.5;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
}

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

.btn-secondary {
    background: var(--secondary-color);
    color: var(--white);
}

.btn-secondary:hover {
    background: var(--gray-700);
}

.btn-light {
    background: var(--light-color);
    color: var(--gray-700);
}

.btn-light:hover {
    background: var(--gray-200);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

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

.btn-outline-secondary:hover {
    background: var(--secondary-color);
    color: var(--white);
}

/* Forms */
.form-control {
    display: block;
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--gray-700);
    background-color: var(--white);
    border: 1px solid var(--gray-400);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.form-select {
    display: block;
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--gray-700);
    background-color: var(--white);
    border: 1px solid var(--gray-400);
    border-radius: var(--border-radius);
    transition: var(--transition);
    cursor: pointer;
}

.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--gray-700);
}

.form-text {
    margin-top: 0.25rem;
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* Alerts */
.alert {
    padding: 1rem;
    margin-bottom: 1rem;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
}

.alert-success {
    color: #0f5132;
    background-color: #d1e7dd;
    border-color: #badbcc;
}

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

.alert-warning {
    color: #664d03;
    background-color: #fff3cd;
    border-color: #ffecb5;
}

.alert-info {
    color: #055160;
    background-color: #cff4fc;
    border-color: #b6effb;
}

.alert-dismissible {
    position: relative;
    padding-right: 3rem;
}

.btn-close {
    position: absolute;
    top: 0;
    right: 0;
    padding: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: inherit;
}

/* Tables */
.table {
    width: 100%;
    margin-bottom: 1rem;
    color: var(--gray-700);
    border-collapse: collapse;
}

.table th,
.table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.table th {
    background-color: var(--gray-100);
    font-weight: 600;
    color: var(--gray-700);
}

.table-hover tbody tr:hover {
    background-color: var(--gray-100);
}

.table-responsive {
    overflow-x: auto;
}

/* Utilities */
.text-center { text-align: center; }
.text-start { text-align: left; }
.text-end { text-align: right; }

.text-primary { color: var(--primary-color); }
.text-success { color: var(--success-color); }
.text-danger { color: var(--danger-color); }
.text-warning { color: var(--warning-color); }
.text-info { color: var(--info-color); }
.text-muted { color: var(--gray-600); }

.bg-primary { background-color: var(--primary-color) !important; }
.bg-light { background-color: var(--gray-100) !important; }
.bg-dark { background-color: var(--dark-color) !important; }

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

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 1.5rem; }
.mb-5 { margin-bottom: 3rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 1rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }

.ms-1 { margin-left: 0.25rem; }
.ms-2 { margin-left: 0.5rem; }
.ms-3 { margin-left: 1rem; }

.me-1 { margin-right: 0.25rem; }
.me-2 { margin-right: 0.5rem; }
.me-3 { margin-right: 1rem; }

.py-1 { padding-top: 0.25rem; padding-bottom: 0.25rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-3 { padding-top: 1rem; padding-bottom: 1rem; }
.py-4 { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.py-5 { padding-top: 3rem; padding-bottom: 3rem; }

.p-0 { padding: 0; }
.p-4 { padding: 1.5rem; }
.p-5 { padding: 3rem; }

.px-4 { padding-left: 1.5rem; padding-right: 1.5rem; }

.justify-content-center { justify-content: center; }
.justify-content-between { justify-content: space-between; }

.align-items-center { align-items: center; }

.d-flex { display: flex; }
.d-grid { display: grid; }
.d-none { display: none; }

.w-100 { width: 100%; }

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

.border-0 { border: 0; }

.fw-bold { font-weight: 700; }
.fw-normal { font-weight: 400; }

.h1 { font-size: 2.5rem; }
.h2 { font-size: 2rem; }
.h3 { font-size: 1.75rem; }
.h4 { font-size: 1.5rem; }
.h5 { font-size: 1.25rem; }
.h6 { font-size: 1rem; }

.badge {
    display: inline-block;
    padding: 0.35em 0.65em;
    font-size: 0.75em;
    font-weight: 700;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    vertical-align: baseline;
    border-radius: 0.375rem;
}

.badge.bg-primary {
    background-color: var(--primary-color) !important;
    color: var(--white);
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar-toggler {
        display: block;
    }
    
    .navbar-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
        flex-direction: column;
        align-items: stretch;
        padding: 1rem;
        box-shadow: var(--box-shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease-in-out;
        z-index: 1000;
    }
    
    .navbar-nav.show {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-item {
        margin: 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }
    
    .nav-item:last-child {
        border-bottom: none;
    }
    
    .nav-link {
        padding: 1rem 0;
        display: block;
        border-bottom: none;
    }
    
    .nav-link:hover,
    .nav-link.active {
        background-color: rgba(255, 255, 255, 0.1);
        border-bottom: none;
    }
    
    .display-4 {
        font-size: 2.5rem;
    }
    
    .hero-section {
        padding: 2rem 0;
    }
    
    .row {
        flex-direction: column;
    }
    
    .col, .col-6, .col-4, .col-3 {
        flex: 0 0 100%;
        margin-bottom: 1rem;
    }
    
    /* Enhanced table responsiveness */
    .table-responsive {
        font-size: 0.875rem;
        border: 1px solid var(--gray-200);
        border-radius: var(--border-radius);
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .table {
        min-width: 600px; /* Ensure table has minimum width for readability */
    }
    
    .table th,
    .table td {
        padding: 0.5rem;
        white-space: nowrap;
    }
    
    .table th:first-child,
    .table td:first-child {
        position: sticky;
        left: 0;
        background-color: var(--gray-100);
        z-index: 10;
    }
    
    .table th:first-child {
        background-color: var(--gray-200);
    }
    
    .btn-lg {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
    
    /* Mobile-specific improvements */
    .container {
        padding: 0 0.75rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .card-header {
        padding: 1rem;
    }
    
    .hero-icon {
        font-size: 3rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .feature-icon {
        font-size: 2.5rem;
    }
    
    /* Mobile tab styles */
    .tab-buttons {
        flex-direction: column;
        margin: -1rem -1rem 0 -1rem;
        padding: 0 1rem;
    }
    
    .tab-button {
        padding: 0.75rem 1rem;
        justify-content: flex-start;
        border-bottom: 1px solid var(--gray-200);
        border-right: none;
    }
    
    .tab-button.active {
        border-bottom-color: var(--gray-200);
        border-left: 3px solid var(--primary-color);
    }
    
    /* Card layout for very small screens */
    @media (max-width: 480px) {
        .table-responsive {
            overflow: visible;
        }
        
        .table,
        .table thead,
        .table tbody,
        .table th,
        .table td,
        .table tr {
            display: block;
        }
        
        .table thead tr {
            position: absolute;
            top: -9999px;
            left: -9999px;
        }
        
        .table tr {
            border: 1px solid var(--gray-200);
            margin-bottom: 1rem;
            padding: 1rem;
            border-radius: var(--border-radius);
            background: var(--white);
            box-shadow: var(--box-shadow);
        }
        
        .table td {
            border: none;
            position: relative;
            padding: 0.5rem 0 0.5rem 50%;
            white-space: normal;
        }
        
        .table td:before {
            content: attr(data-label) ": ";
            position: absolute;
            left: 6px;
            width: 45%;
            padding-right: 10px;
            white-space: nowrap;
            font-weight: 600;
            color: var(--gray-700);
        }
    }
}

/* Custom Components */
.hero-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.feature-card {
    text-align: center;
    padding: 2rem;
}

.feature-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.search-examples {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-top: 0.75rem;
}

.verification-success {
    text-align: center;
    padding: 2rem;
}

.verification-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.callsign-display {
    font-family: 'Courier New', monospace;
    font-size: 2rem;
    font-weight: bold;
    color: var(--success-color);
    background: var(--gray-100);
    padding: 1rem;
    border-radius: var(--border-radius);
    display: inline-block;
}

/* Footer */
footer {
    background: var(--dark-color);
    color: var(--white);
    padding: 2rem 0;
    margin-top: 3rem;
}

footer h5 {
    color: var(--white);
    margin-bottom: 1rem;
}

footer p {
    color: var(--gray-400);
    margin-bottom: 0;
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

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

.text-decoration-none {
    text-decoration: none;
}

.text-decoration-none:hover {
    text-decoration: underline;
}

/* Code */
code {
    background: var(--gray-100);
    padding: 0.2rem 0.4rem;
    border-radius: var(--border-radius);
    font-family: 'Courier New', monospace;
    font-size: 0.875em;
}

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

li {
    margin-bottom: 0.25rem;
}

/* Icons */
.fas, .fa {
    margin-right: 0.5rem;
}

/* Spacing utilities */
.g-3 > * {
    margin-bottom: 1rem;
}

.gap-2 > * + * {
    margin-top: 0.5rem;
}

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

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

/* Custom Tab System */
.tab-buttons {
    display: flex;
    border-bottom: 1px solid var(--gray-200);
    margin: -1.5rem -1.5rem 0 -1.5rem;
    padding: 0 1.5rem;
}

.tab-button {
    background: none;
    border: none;
    padding: 1rem 1.5rem;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    color: var(--gray-600);
    font-weight: 500;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-button:hover {
    color: var(--primary-color);
    background-color: var(--gray-100);
}

.tab-button.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background-color: var(--white);
}

.tab-content {
    position: relative;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-dialog {
    position: relative;
    width: auto;
    max-width: 800px;
    margin: 1.75rem auto;
}

.modal-content {
    background-color: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-lg);
    overflow: hidden;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    background-color: var(--gray-100);
}

.modal-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
}

.btn-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-600);
    padding: 0;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-close:hover {
    color: var(--gray-800);
}

.modal-body {
    padding: 1.5rem;
}