/* ============================================
   สไตล์เว็บฝากรูป
   ============================================ */

:root {
    --primary-color: #007bff;
    --success-color: #28a745;
    --danger-color: #dc3545;
    --light-bg: #f8f9fa;
    --border-radius: 8px;
    --box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-bg);
}

/* ============================================
   Upload Area
   ============================================ */

.upload-area {
    border: 3px dashed var(--primary-color);
    border-radius: var(--border-radius);
    padding: 40px 20px;
    text-align: center;
    background-color: #f0f7ff;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-area:hover {
    border-color: var(--success-color);
    background-color: #f0fff4;
    transform: scale(1.02);
}

.upload-area.dragover {
    border-color: var(--success-color);
    background-color: #e8f5e9;
    box-shadow: var(--box-shadow);
}

.upload-icon {
    width: 60px;
    height: 60px;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.upload-area h5 {
    color: var(--primary-color);
    font-weight: 600;
    margin: 10px 0;
}

.upload-area p {
    font-size: 14px;
}

/* ============================================
   Gallery Grid
   ============================================ */

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    padding: 10px;
}

.gallery-card {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.gallery-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

.gallery-image-wrapper {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background-color: var(--light-bg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.gallery-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.gallery-card:hover .gallery-image {
    transform: scale(1.05);
}

.gallery-info {
    padding: 15px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.gallery-info small {
    flex-grow: 1;
}

/* ============================================
   Cards
   ============================================ */

.card {
    border: none;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.card-header {
    border-bottom: none;
    padding: 15px 20px;
    font-weight: 600;
}

.card-body {
    padding: 25px;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
    border-radius: 6px;
    font-weight: 500;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background-color: #0056b3;
    border-color: #0056b3;
    box-shadow: 0 4px 8px rgba(0, 86, 179, 0.3);
}

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

.btn-success:hover {
    background-color: #218838;
    border-color: #218838;
}

/* ============================================
   Alert Messages
   ============================================ */

.alert {
    border-radius: var(--border-radius);
    border: none;
    margin-bottom: 20px;
    animation: slideIn 0.3s ease;
}

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

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-left: 4px solid var(--success-color);
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border-left: 4px solid var(--danger-color);
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border-left: 4px solid var(--primary-color);
}

/* ============================================
   Loading Spinner
   ============================================ */

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 0.2em;
}

/* ============================================
   Navbar
   ============================================ */

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

.navbar-brand {
    font-weight: 700;
    font-size: 20px;
}

/* ============================================
   Footer
   ============================================ */

footer {
    margin-top: auto;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 15px;
    }

    .upload-area {
        padding: 30px 15px;
    }

    .upload-icon {
        width: 45px;
        height: 45px;
    }

    .card-body {
        padding: 15px;
    }
}

@media (max-width: 480px) {
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 10px;
    }

    .upload-area {
        padding: 20px 10px;
    }

    .upload-area h5 {
        font-size: 16px;
    }

    .btn-lg {
        padding: 0.5rem 1rem;
        font-size: 14px;
    }
}

/* ============================================
   Modal
   ============================================ */

.modal-content {
    border-radius: var(--border-radius);
    border: none;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.modal-header {
    border-bottom: 1px solid #e9ecef;
    background-color: var(--light-bg);
}

.modal-footer {
    border-top: 1px solid #e9ecef;
    background-color: var(--light-bg);
}

/* ============================================
   File Info
   ============================================ */

#fileInfo {
    background-color: #e7f3ff;
    border-left: 4px solid var(--primary-color);
    padding: 12px 15px;
}

#previewContainer {
    text-align: center;
    padding: 15px;
    background-color: var(--light-bg);
    border-radius: var(--border-radius);
}

#preview {
    max-width: 100%;
    border-radius: 6px;
    box-shadow: var(--box-shadow);
}