/* Certificate Generator Custom Styles */

/* Global Styles */
:root {
    --brand: #0d6efd;
    --brand-600: hsl(216, 32%, 62%);
    --text: #0f172a; /* slate-900 for readable dark text instead of black */
    --muted: #f5f9ff;
    --surface: #ffffff;
    --surface-2: #f8fafc;
    --ring: rgba(13, 110, 253, .25);
    --shadow: 0 10px 25px rgba(13,110,253,.12);
    --radius: 14px;
    --transition: 180ms cubic-bezier(.2,.8,.2,1);
}

/* Manual theme support via data-theme attribute */
[data-theme="dark"] {
    --surface: #0f1f3a; /* navy tones */
    --surface-2: #102445;
    --text: #e5efff;
    --muted: #b6c5e1;
    --ring: rgba(13, 110, 253, .35);
    --shadow: 0 10px 25px rgba(13,110,253,.25);
}

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    * { animation: none !important; transition: none !important; }
}

body {
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
    color: var(--text);
    background: linear-gradient(180deg, var(--surface-2), #fff 40%);
    line-height: 1.6;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    min-height: 60vh;
    display: flex;
    align-items: center;
}

.hero-icon {
    font-size: 8rem;
    opacity: 0.8;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* Feature Icons */
.feature-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    transition: transform 0.3s ease;
}

.feature-icon:hover {
    transform: scale(1.1);
}

/* Cards */
.card {
    transition: transform var(--transition), box-shadow var(--transition);
    border-radius: var(--radius);
    border: 1px solid #eef2f7;
    background-color: var(--surface);
}

/* Dense/compact layout mode */
[data-density="compact"] .card { border-radius: 10px; }
[data-density="compact"] .btn { padding: .55rem .9rem; border-radius: 10px; }
[data-density="compact"] .form-control, 
[data-density="compact"] .form-select { padding-top: .45rem; padding-bottom: .45rem; border-radius: 10px; }
[data-density="compact"] .table td, 
[data-density="compact"] .table th { padding: .45rem .6rem; }

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(13,110,253,0.18) !important;
}

/* Statistics */
.stat-item {
    padding: 1rem;
}

.stat-item h3 {
    margin-bottom: 0.5rem;
}

/* Certificate Preview */
.certificate-preview {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(13,110,253,0.15);
    transition: transform 0.3s ease;
}

.certificate-preview:hover {
    transform: scale(1.02);
}

/* Skeleton / shimmer loaders */
.skeleton {
    position: relative;
    overflow: hidden;
    background: linear-gradient(90deg, rgba(182, 0, 0, 0.06), rgba(224, 9, 9, 0.rgba(87, 9, 233, 0.06)0.06));
    background-size: 200% 100%;
    animation: shimmer 1.2s infinite linear;
    border-radius: 12px;
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-text { height: 1rem; margin: .35rem 0; }
.skeleton-avatar { width: 48px; height: 48px; border-radius: 50%; }
.skeleton-rect { height: 160px; }

/* Form Styles */
.form-control, .form-select {
    border-radius: 12px;
    border: 1.5px solid #e5e7eb;
    transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition);
    background-color: #fbfbfb;
}

.form-control:focus, .form-select:focus {
    border-color: var(--brand);
    box-shadow: 0 0 0 .25rem var(--ring);
    background-color: #ffffff;
}

/* Button Styles */
.btn {
    border-radius: 12px;
    padding: 0.7rem 1.2rem;
    font-weight: 600;
    transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition), border-color var(--transition);
}

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

.btn-primary:hover, .btn-primary:focus {
    background-color: var(--brand-600);
    border-color: var(--brand-600);
}

.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }

/* Alert Styles */
.alert {
    border-radius: 12px;
    border: none;
    box-shadow: 0 2px 10px rgba(13,110,253,0.12);
}

/* Table Styles */
.table {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(13,110,253,0.12);
}

.table thead th {
    background-color: #f8f9fa;
    border: none;
    font-weight: 600;
    color: #576f86;
}

/* Badge Styles */
.badge {
    border-radius: 20px;
    padding: 0.5rem 1rem;
    font-weight: 500;
}

/* Navigation */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1030; /* keep above page content, use Bootstrap default layer */
    background: linear-gradient(90deg, #0d6efd, #0b5ed7);
    box-shadow: 0 4px 18px rgba(13,110,253,.15);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.4rem;
}

.navbar-dark .navbar-nav .nav-link {
    color: #ffffff !important;
}

.navbar-dark .navbar-nav .nav-link:hover {
    color: #e7f0ff !important;
}

.navbar-dark .navbar-toggler {
    border-color: rgba(255,255,255,.4);
}

.navbar-dark .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255,255,255,0.9%29' stroke-width='2' stroke-linecap='round' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Upload Area */
.upload-area {
    border: 2px dashed #dee2e6;
    border-radius: var(--radius);
    padding: 3rem;
    text-align: center;
    transition: all var(--transition);
    cursor: pointer;
    background-color: #fafbff;
}

.upload-area:hover {
    border-color: #007bff;
    background-color: #f8f9ff;
}

.upload-area.dragover {
    border-color: #007bff;
    background-color: #e7f3ff;
}

/* Loading Spinner */
.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        min-height: 50vh;
        text-align: center;
    }
    
    .hero-icon {
        font-size: 4rem;
        margin-top: 2rem;
    }
    
    .display-4 {
        font-size: 2rem;
    }
    
    .feature-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
}

/* Print Styles */
@media print {
    .navbar, .btn, .alert {
        display: none !important;
    }
    
    .card {
        box-shadow: none !important;
        border: 1px solid #dee2e6 !important;
    }
    
    .certificate-preview {
        transform: none !important;
    }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
    .bg-light {
        background-color: #0f1f3a !important;
        color: #e5efff;
    }
    
    .card {
        background-color: #0d81c4;
        color: #e5efff;
    }
    
    .form-control, .form-select {
        background-color: #ffffff;
        border-color: #294b7a;
        color: #1d5bbe;
    }
    
    .table {
        color: #e5efff;
    }
    
    .table thead th {
        background-color: #3d5a8b;
        color: #e5efff;
    }
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: #007bff;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: #0056b3;
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

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

.slide-in-left {
    animation: slideInLeft 0.5s ease-out;
}

@keyframes slideInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

.slide-in-right {
    animation: slideInRight 0.5s ease-out;
}

@keyframes slideInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Utility Classes */
.text-gradient {
    background: linear-gradient(45deg, #007bff, #0056b3);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.shadow-custom {
    box-shadow: 0 10px 30px rgba(13,110,253,0.18);
}

.border-gradient {
    border: 2px solid;
    border-image: linear-gradient(45deg, #007bff, #0056b3) 1;
}