/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: inherit;
}

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

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

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

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

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

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

.btn-danger:hover {
    background: var(--danger-hover);
}

.btn-block {
    width: 100%;
    margin-bottom: 0.75rem;
}

.btn-block:last-child {
    margin-bottom: 0;
}

/* Dropzone */
.dropzone {
    background: var(--bg-primary);
    border: 3px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 4rem 2rem;
    text-align: center;
    transition: all 0.3s;
    cursor: pointer;
}

.dropzone:hover {
    border-color: var(--primary-color);
    background: var(--bg-secondary);
}

.dropzone.dragover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
    transform: scale(1.02);
}

.dropzone-content {
    pointer-events: none;
}

.upload-icon {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.dropzone h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.dropzone p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1rem;
}

.dropzone .hint {
    font-size: 0.875rem;
    margin-top: 1rem;
    margin-bottom: 0;
}

#select-files-btn {
    pointer-events: auto;
    margin: 1rem auto;
}

/* Empty States */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-state h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

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

.mt-1 {
    margin-top: 0.5rem;
}

.mt-2 {
    margin-top: 1rem;
}

.mb-1 {
    margin-bottom: 0.5rem;
}

.mb-2 {
    margin-bottom: 1rem;
}

/* Responsive Buttons */
@media (max-width: 768px) {
    .btn {
        padding: 0.625rem 1.25rem;
        font-size: 0.875rem;
    }

    .dropzone {
        padding: 3rem 1.5rem;
    }

    .dropzone h2 {
        font-size: 1.25rem;
    }

    .upload-icon {
        width: 48px;
        height: 48px;
    }
}