:root {
    --primary-color: #3f51b5;
    --primary-light: #757de8;
    --primary-dark: #002984;
    --secondary-color: #00bcd4;
    --secondary-light: #62efff;
    --secondary-dark: #008ba3;
    --accent-color: #ff4081;
    --background-color: #f8f9fa;
    --card-bg: #fff;
    --text-color: #37474f;
    --text-light: #78909c;
    --border-color: #e0e0e0;
    --success-color: #4caf50;
    --error-color: #f44336;
    --shadow: 0 4px 20px rgb(0 0 0 / 8%);
    --shadow-hover: 0 8px 30px rgb(0 0 0 / 12%);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    font-family: Roboto, 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    background-image: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    animation: fadeIn 0.8s ease-in-out;
}

header {
    text-align: center;
    margin-bottom: 3rem;
    padding-bottom: 1.5rem;
    position: relative;
}

header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(to right, var(--primary-light), var(--secondary-color));
    border-radius: 2px;
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 0.8rem;
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    color: var(--text-light);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.upload-container, .preview-container {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 2.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2.5rem;
    transition: var(--transition);
    border: 1px solid rgb(255 255 255 / 80%);
}

.upload-container:hover, .preview-container:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-5px);
}

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3.5rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 1.5rem;
    background-color: rgb(245 247 250 / 50%);
}

.upload-area:hover, .upload-area.dragover {
    border-color: var(--secondary-color);
    background-color: rgb(0 188 212 / 5%);
    transform: scale(1.01);
}

.upload-area i {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    animation: float 3s ease-in-out infinite;
}

.upload-hint {
    display: block;
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--text-light);
    opacity: 80%;
}

@keyframes float {
    0% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0); }
}

.btn {
    padding: 0.85rem 1.8rem;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    font-size: 1rem;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 10px rgb(0 0 0 / 10%);
    text-transform: uppercase;
}

.btn.small {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.btn.xs {
    padding: 0.35rem 0.6rem;
    font-size: 0.8rem;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 5px;
    height: 5px;
    background: rgb(255 255 255 / 50%);
    opacity: 0%;
    border-radius: 100%;
    transform: scale(1, 1) translate(-50%);
    transform-origin: 50% 50%;
}

.btn:focus:not(:active)::after {
    animation: ripple 1s ease-out;
}

@keyframes ripple {

    0% {
        transform: scale(0, 0);
        opacity: 50%;
    }

    20% {
        transform: scale(25, 25);
        opacity: 30%;
    }

    100% {
        opacity: 0%;
        transform: scale(40, 40);
    }
}

.btn:disabled {
    opacity: 60%;
    cursor: not-allowed;
}

.btn.primary {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-light));
    color: white;
}

.btn.primary:hover:not(:disabled) {
    background: linear-gradient(45deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgb(63 81 181 / 40%);
}

.btn.primary:active:not(:disabled) {
    transform: translateY(1px);
    box-shadow: 0 2px 5px rgb(63 81 181 / 40%);
}

.btn.secondary {
    background: white;
    color: var(--primary-color);
    border: 1px solid var(--border-color);
}

.btn.secondary:hover:not(:disabled) {
    background: #f8f9fa;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgb(0 0 0 / 5%);
    border-color: var(--primary-light);
}

.btn.secondary:active:not(:disabled) {
    transform: translateY(1px);
    box-shadow: 0 2px 5px rgb(0 0 0 / 5%);
}

.btn.ghost {
    background: transparent;
    color: var(--text-light);
    border: none;
    box-shadow: none;
    text-transform: none;
    padding: 0.4rem 0.75rem;
}

.btn.ghost:hover:not(:disabled) {
    color: var(--text-color);
    background: transparent;
    box-shadow: none;
    transform: none;
    text-decoration: underline;
}

.file-type-selector {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
    background: white;
    padding: 0.5rem;
    border-radius: 50px;
    box-shadow: var(--shadow);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.mode-btn {
    padding: 0.85rem 1.8rem;
    border: none;
    background-color: transparent;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
    border-radius: 50px;
    color: var(--text-light);
    flex: 1;
    position: relative;
    z-index: 1;
    font-size: 0.95rem;
    letter-spacing: 0.5px;
}

.mode-btn:hover:not(.active) {
    color: var(--primary-color);
}

.mode-btn.active {
    color: white;
}

.mode-btn.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    border-radius: 50px;
    z-index: -1;
    box-shadow: 0 4px 15px rgb(63 81 181 / 30%);
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0%; }
    to { opacity: 100%; }
}

/* Simple modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgb(0 0 0 / 50%);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal-content {
    background: #fff;
    max-width: 720px;
    width: 100%;
    border-radius: 12px;
    box-shadow: var(--shadow-hover);
    padding: 1.5rem 1.5rem 1.75rem;
    position: relative;
}

/* Modal header with language toggle */
.modal-content .modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 0.25rem;
}
.modal-content .lang-toggle .btn {
    margin-left: 6px;
}
.modal-content .lang-toggle .btn.active {
    box-shadow: 0 2px 8px rgb(0 0 0 / 10%);
}

/* Method toggle */
.method-toggle {
    display: flex;
    gap: 6px;
    margin: 0.5rem 0 0.75rem;
    flex-wrap: wrap;
}
.method-toggle .btn.active {
    box-shadow: 0 2px 8px rgb(0 0 0 / 10%);
}

/* Method panel and QR alignment */
.modal-content .method-panel h3 {
    margin-top: 0.25rem;
}
.qr-wrap {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 0.25rem;
}

.qr {
    max-width: 160px;
    height: auto;
    border-radius: 6px;
}

/* Donate list layout */
.donate-list {
    list-style: none;
    padding-left: 0;
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.donate-item {
    border: 1px solid rgb(0 0 0 / 8%);
    border-radius: 10px;
    padding: 0.75rem;
    background: #fff;
}
.donate-item .qr {
    max-width: 140px;
    height: auto;
    margin-top: 0.25rem;
    border-radius: 6px;
}

/* Bottom sheet layout */
.modal.bottom-sheet {
    align-items: flex-end;
}
.modal.bottom-sheet .modal-content {
    max-width: none;
    width: 100%;
    border-radius: 16px 16px 0 0;
    transform: translateY(16px);
    animation: slideUp 0.2s ease-out forwards;
}

@keyframes slideUp {
    from { transform: translateY(16px); opacity: 0%; }
    to { transform: translateY(0); opacity: 100%; }
}

.modal-content h2 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.modal-content h3 {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.modal-content p { color: var(--text-color); }

.modal-content ul {
    margin-left: 1.2rem;
    color: var(--text-color);
}

.modal-close {
    position: absolute;
    top: 10px;
    right: 12px;
    border: none;
    background: transparent;
    font-size: 1.75rem;
    line-height: 1;
    color: var(--text-light);
    cursor: pointer;
}

.modal-close:hover { color: var(--text-color); }

.file-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.file-item {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    cursor: grab;
    transition: var(--transition);
    background-color: white;
    box-shadow: var(--shadow);
    border: 1px solid rgb(0 0 0 / 5%);
}

.file-item:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-hover);
    z-index: 1;
}

.file-item .file-preview {
    width: 100%;
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #f9f9f9;
    overflow: hidden;
    position: relative;
}

.file-item .file-preview::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgb(0 0 0 / 0%) 70%, rgb(0 0 0 / 30%) 100%);
    opacity: 0%;
    transition: var(--transition);
    z-index: 1;
}

.file-item:hover .file-preview::before {
    opacity: 100%;
}

.file-item img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
    transition: var(--transition);
}

.file-item:hover img {
    transform: scale(1.05);
}

.file-item .pdf-icon {
    font-size: 4rem;
    color: var(--accent-color);
    transition: var(--transition);
}

.file-item:hover .pdf-icon {
    transform: scale(1.1);
}

.file-item .file-name {
    padding: 0.8rem;
    font-size: 0.9rem;
    background-color: white;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
    border-top: 1px solid rgb(0 0 0 / 5%);
}

.file-item .remove-file {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: white;
    color: var(--error-color);
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgb(0 0 0 / 15%);
    z-index: 2;
    opacity: 0%;
    transform: scale(0.8);
    transition: var(--transition);
}

.file-item:hover .remove-file {
    opacity: 100%;
    transform: scale(1);
}

.file-item .remove-file:hover {
    background-color: var(--error-color);
    color: white;
    transform: scale(1.1);
}

.file-item .rotate-controls {
    position: absolute;
    top: 10px;
    left: 10px;
    display: flex;
    flex-direction: column;
    gap: 5px;
    opacity: 0%;
    transform: scale(0.8);
    transition: var(--transition);
    z-index: 2;
}

.file-item:hover .rotate-controls {
    opacity: 100%;
    transform: scale(1);
}

.file-item .rotate-btn {
    background-color: white;
    color: var(--primary-color);
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgb(0 0 0 / 15%);
    transition: var(--transition);
}

.file-item .rotate-btn:hover {
    background-color: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

.file-item .crop-btn {
    background-color: white;
    color: var(--secondary-color);
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgb(0 0 0 / 15%);
    transition: var(--transition);
}

.file-item .crop-btn:hover {
    background-color: var(--secondary-color);
    color: white;
    transform: scale(1.1);
}

.crop-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.crop-modal-content {
    background-color: white;
    border-radius: 12px;
    padding: 2rem;
    max-width: 90vw;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.crop-modal-content h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
    text-align: center;
}

.crop-container {
    width: 100%;
    max-width: 500px;
    height: 400px;
    margin: 0 auto 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
}

.crop-container img {
    max-width: 100%;
    max-height: 100%;
    display: block;
}

.crop-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.file-item img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
    transition: var(--transition);
}

/* For backward compatibility */

.image-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.image-item {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    cursor: grab;
    transition: var(--transition);
    background-color: white;
    box-shadow: var(--shadow);
    border: 1px solid rgb(0 0 0 / 5%);
}

.image-item:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-hover);
    z-index: 1;
}

.image-item img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
    transition: var(--transition);
}

.image-item:hover img {
    transform: scale(1.05);
}

.image-item .image-name {
    padding: 0.8rem;
    font-size: 0.9rem;
    background-color: white;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
    border-top: 1px solid rgb(0 0 0 / 5%);
}

.image-item .remove-image {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: white;
    color: var(--error-color);
    border: none;
    border-radius: 50%;
    width: 32px;
    height: 32px;
    font-size: 14px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgb(0 0 0 / 15%);
    z-index: 2;
    opacity: 0%;
    transform: scale(0.8);
    transition: var(--transition);
}

.image-item:hover .remove-image {
    opacity: 100%;
    transform: scale(1);
}

.image-item .remove-image:hover {
    background-color: var(--error-color);
    color: white;
    transform: scale(1.1);
}

.actions {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 2.5rem;
}

.loading-container {
    text-align: center;
    padding: 4rem 2rem;
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    animation: fadeIn 0.5s ease-out;
}

.spinner {
    position: relative;
    width: 70px;
    height: 70px;
    margin: 0 auto 1.5rem;
}

.spinner::before,
.spinner::after {
    content: '';
    position: absolute;
    border-radius: 50%;
}

.spinner::before {
    width: 100%;
    height: 100%;
    background-image: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    animation: spin 0.5s linear infinite;
}

.spinner::after {
    top: 10%;
    left: 10%;
    width: 80%;
    height: 80%;
    background-color: white;
}

.loading-container p {
    font-size: 1.2rem;
    color: var(--text-color);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.loading-container small {
    display: block;
    color: var(--text-light);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { opacity: 60%; }
    50% { opacity: 100%; }
    100% { opacity: 60%; }
}

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

footer {
    text-align: center;
    margin-top: 3rem;
    padding-top: 1.5rem;
    color: var(--text-light);
    font-size: 0.9rem;
    border-top: 1px solid rgb(0 0 0 / 5%);
}

/* Sortable classes */

.sortable-ghost {
    opacity: 30%;
    transform: scale(0.95);
}

.sortable-chosen {
    box-shadow: 0 0 0 3px var(--accent-color), var(--shadow-hover);
    z-index: 10;
}

.sortable-drag {
    transform: rotate(3deg) scale(1.05);
    z-index: 100;
}

/* Responsive styles */
@media (width <= 768px) {

    .container {
        padding: 1.5rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .upload-area {
        padding: 2.5rem 1.5rem;
    }
    
    .file-list, .image-list {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 1rem;
    }
    
    .actions {
        flex-direction: column;
        gap: 1rem;
    }
    
    .btn {
        width: 100%;
    }
}

/* Animation for page load */
@keyframes fadeIn {

    from {
        opacity: 0%;
        transform: translateY(20px);
    }

    to {
        opacity: 100%;
        transform: translateY(0);
    }
}